Idling rotation mechanism used in the housing of a video cassette tape recorder

Abstract

An idling rotation mechanism used in a video tape recorder (VTR) to mount and dismount a video cassette tape (VCT) by using only a loading motor. The VCT is mounted and dismounted by moving a holding pin, connected to a VCT holder, along a slot in a support plate. The pin is connected to a idling rotation mechanism that is connected to the loading motor. To prevent the VCT from becoming jammed in the VTR because of excessive rotation of the loading motor, a timing gear in the idling rotation mechanism idles after the pin has been partially moved in the slot.

What is claimed is: 
     
       1. An idling rotation mechanism in a housing of a video cassette tape recorder comprising: a speed-variation means drivingly connectable to a motor so as to vary .[.the.]. .Iadd.a .Iaddend.transmitted rotational speed thereof;   a cassette transporting holder engagable with a video cassette tape, said transporting holder is movable between an initial position and a mounted position;   a drive means connectable to the cassette transporting holder and the speed-variation means so as to move the transporting holder between .Iadd.the initial position and the .Iaddend.mounted position;   a cut off means on said drive means to cut off the transmission of rotational forces from the motor to the drive means so as to prevent the transporting holder from continuing to move after reaching the mounted position;   said speed-variation means comprising: a worm drivingly connectable to an output shaft of said motor;   a worm gear in meshing engagement with said worm; and   a bevel gear, mounted on a first shaft extending from the housing, in meshing engagement with said worm gear to vary the transmitted rotational speed of said motor, and     said means for cutting off rotation comprising: a timing gear, rotatably mounted on a second shaft extending from said housing, in meshing engagement with a small gear on a back side of said bevel gear, said timing gear having a gear part, with a portion of the gear .Iadd.part .Iaddend.covered by a sliding part, and a rotating plate having a cut out portion; and   an arm gear, rotatably mounted on a third shaft extending from said housing, having a geared part that can be in meshing engagement with said gear part, said geared part having a pin at an end portion so that when said pin is rotated, along with the arm gear, the pin passes through the cut out portion so as to contact an edge part of the rotating plate and cut off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part.     
     
     
       2. A mechanism as claimed in claim 1, wherein said drive means comprises.[.;.]. .Iadd.: .Iaddend. a side arm rotatably mounted on said third shaft coaxially with said arm gear, said side arm is drivingly connectable to said arm gear and has a gripper to engage a guide pin, connected to said transporting holder, so that the movement of the guide pin, along a guide slot formed in a support plate of said housing, by the side arm will cause the transporting holder to be moved in the housing;   a resilient means, connectable to said side arm, to engage said .Iadd.guide .Iaddend.pin.   
     
     
       3. A mechanism as claimed in claim 2, wherein a relay gear, connectable to a gear portion on said side arm, can be rotated to open and close access doors to said housing. 
     
     
       4. An idling rotation mechanism in a housing of a video cassette tape recorder comprising.[.;.]..Iadd.:.Iaddend. a reversible motor having an output shaft;   a speed-variation means drivingly connectable to said output shaft of said motor to vary the transmitted rotational speed thereof;   a cassette transporting holder engagable with a video cassette tape, said transporting holder being movable between an initial position and a mounted position;   a drive means connectable to the transporting holder and the speed-variation means so as to move the transporting holder between the initial position and the mounted position;   a cut off means on said drive means to cut off the transmission of rotational forces from the motor to the drive means so as to prevent the transporting holder from continuing to move after reaching the mounted position, said cut off means being actuated by the rotational forces of said motor;   a power transmitting means, connectable to said motor and a loading assembly, to load and unload the video cassette tape from a tape head drum;   said speed-variation means comprising: a worm drivingly connectable to an output shaft of said motor;   a worm gear in meshing engagement with said worm; and   a bevel gear, mounted on a first shaft extending from the housing, in meshing engagement with said worm gear to vary the transmitted rotational speed of said motor; and     said means for cutting off rotation comprising: a timing gear, rotatably mounted on a second shaft extending from said housing, in meshing engagement with a small gear on a back side of said bevel gear, said timing gear having a gear part, with a portion of the gear part covered by a sliding part, and a rotating plate having a cut out portion; and   an arm gear, rotatably mounted on a third shaft extending from said housing, having a geared part that can be in meshing engagement with said gear part, said geared part having a pin at an end portion so that when said pin is rotated, along with the arm gear, the pin contacts an edge part of the rotating plate and cuts off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part.     
     
     
       5. A mechanism as claimed in claim 4, wherein said drive means comprises.[.;.]..Iadd.:.Iaddend. a side arm rotatably mounted on said third shaft coaxially with said arm gear, said side arm is drivingly connectable to said arm gear and has a gripper to engage a guide pin.[.,.]. connected to said transporting holder, so that the movement of the guide pin, along a guide slot formed in a support plate of said housing, by the side arm will cause the transporting holder to be moved in the housing; .Iadd.and .Iaddend.   a resilient means, connectable to said side arm, to engage said .Iadd.guide .Iaddend.pin.   
     
     
       6. A mechanism as claimed in claim 5, wherein a relay gear, connectable to a gear portion on said side arm, can be rotated to open and close .Iadd.an .Iaddend.access .[.doors.]. .Iadd.door .Iaddend.to said housing. 
     
     
       7. A mechanism as claimed in claim 6, wherein said power transmitting means .[.includes.]. .Iadd.comprises .Iaddend.a gear member with cam curve. .Iadd. 
     
     
       8.  An idling rotation mechanism in a housing of a video cassette tape recorder, comprising: speed-variation means drivingly connectable to a motor so as to vary a transmitted rotational speed of the motor;   a cassette transporting holder engagable with a video cassette tape, said cassette transporting holder being movable between an initial position and a mounted position;   drive means connectable to the cassette transporting holder and the speed-variation means for moving the cassette transporting holder between said initial position and said mounted position;   cut off means on said drive means, for interrupting transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said cut off means comprising:   a timing gear, rotatably mounted on a first shaft extending from said housing, in operational engagement with said speed-variation means, said timing gear having a gear part, with a portion of the gear part covered by a sliding part and a rotating plate having a cut-out portion; and   said drive means being rotatably mounted on a second shaft extending from said housing, and having a geared part that can be in meshing engagement with said gear part, said geared part having a projection at an end portion so that when said projection is rotated, along with an arm gear, the projection passes through the cut-out portion so as to contact an edge part of the rotating plate and cut off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part. .Iaddend..Iadd.   
     
     
       9.  A mechanism as claimed in claim 8, wherein said drive means comprises: means for engaging a guide pin connected to said cassette transporting holder so that the movement of the guide pin by the drive means, along a guide slot formed in a support plate of said housing, will cause the cassette transporting holder to be moved in the housing; and   resilient means connected between said drive means and said guide pin. .Iaddend..Iadd.   
     
     
       10.  A mechanism as claimed in claim 9, further comprised of said resilient means being coupled to rotate with said drive means and to urge said guide pin into said mounted position as said drive means travels toward said mounted position. .Iaddend..Iadd. 
     
     
       11.  A mechanism as claimed in claim 8, further comprised of resilient means coupled to rotated with said drive means, for urging said cassette transporting holder into said mounted position as said drive means travels toward said mounted position. .Iaddend..Iadd. 
     
     
       12.  An idling rotation mechanism in a housing of a video cassette tape recorder, comprising: speed-variation means drivingly connectable to a motor so as to vary a transmitted rotational speed transmitted from said motor;   a cassette transporting holder engagable with a video cassette tape, said cassette transporting holder being movable between an initial position and a mounted position;   drive means connectable to the cassette transporting holder and the speed-variation means so as to move the cassette transporting holder between said initial position and said mounted position;   cut off means on said drive means to cut off transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said speed-variation means comprising: a worm drivingly connectable to an output shaft of said motor;   a worm gear in meshing engagement with said worm; and   a bevel gear mounted on a first shaft extending from the housing, in meshing engagement with said worm gear to vary the transmitted rotational speed of said motor; and     said means for cutting off rotation comprising: a timing gear, rotatably mounted on a second shaft extending from said housing, in meshing engagement with a small gear on a back side of said bevel gear, said timing gear having a gear part, with a portion of the gear part covered by a sliding part, and a rotating plate having a cut out portion; and     an arm gear, rotatably mounted on a third shaft extending from said housing, having a geared part that can be in meshing engagement with said gear part, said geared part having a pin at an end portion so that when said pin is rotated, along with the arm gear, the pin passes through the cut out portion so as to contact an edge part of the rotating plate and contact a stopper on said edge part of the rotating plate to cut off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part. .Iaddend..Iadd.   
     
     
       13.  An idling rotation mechanism in a housing of a video cassette tape recorder, comprising: speed-variation means drivingly connectable to a motor so as to vary a transmitted rotational speed from the motor;   a cassette transporting holder movable between an initial position for receiving a video tape cassette and a mounted position enabling loading of tape from the video tape cassette;   drive means connectable to the cassette transporting holder, for moving the cassette transporting holder between said initial position and said mounted position;   cut off means on said drive means for interrupting the transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said cut off means comprising: a timing gear, rotatably mountable on a second shaft extending from said housing, in operational engagement with said speed-variation means, said timing gear having a gear part, with a portion of a gear part covered by a continuous surface providing a sliding part and a rotating plate comprising a circumferential rim interrupted by a void sector; and   an arm gear, rotatably mounted on a third shaft extending from said housing, said arm gear having a geared part that can be in meshing engagement with said gear part, said geared part having a pin at an end portion so that when said pin is rotated along with the arm gear, the pin passes through the void sector so as to contact said rotating plate and interrupt transmission of rotational forces of said motor after the geared part has been disengaged from the gear part. .Iaddend..Iadd.     
     
     
       14.  An idling rotation mechanism in a housing of a video cassette tape recorder, comprising: speed-variation means drivingly connectable to a motor, for varying the transmitted rotational speed of the motor;   a cassette transporting holder movable between an initial position and a mounted position enabling loading of tape from the tape cassette;   drive means connectable to said cassette transporting holder and the speed-variation means, for moving the cassette transporting holder between said initial position and said mounted position;   said drive means comprising cut off means on said drive means, for interrupting transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said speed-variation means comprising:   a worm drivingly connectable to an output shaft of said motor;   a worm gear in meshing engagement with said worm; and   a bevel gear mounted on a first shaft extending from the housing, in meshing engagement with said worm gear to vary the transmitted rotational speed of said motor;   said cut off means comprising:   a timing gear rotatably mounted on a second shaft extending from said housing, in meshing engagement with a small gear on the back side of said bevel gear, said timing gear having a gear part, with a portion of the gear part covered by a continuous surface providing a sliding part, and a rotating plate comprising a circumferential rim interrupted by a void sector, and   an arm gear, rotatably mounted on a third shaft extending from said housing, having a geared part that can be in meshing engagement with said gear part, said geared part having a pin at an end portion so that when said pin is rotated, along with said arm gear, the pin passes through said void sector so as to contact an edge part of the rotating plate and interrupt transmission of rotational forces of said motor after the geared part has been disengaged from the gear part. .Iaddend..Iadd.   
     
     
       15.  In a front-loading video cassette recorder including a mechanism for moving a cassette holder supporting a tape cassette from an initial position to a loaded position along a L-shaped path, an improved idling rotation mechanism having a first mode of operation, a second mode of operation and a third mode of operation, said improved idling rotation mechanism comprising: a driving gear operatively connected to a motor so as to receive transmitted rotational force, said driving gear comprising a first protruding portion; and   a driven gear operatively connected to a side arm gear, whereby rotational force received by said driven gear from said driving gear in at least said first mode of operation produces displacement of the side arm gear to thereby move the cassette holder along the L-shaped path, said driven gear comprising a second protruding part;   whereby said rotational force is transmitted from said driving gear to said driven gear during said first mode of operation in response to meshing engagement of mutually opposing teeth on each of said driving gear and said driven gear;   whereby said rotational force is transmitted from said driving gear to said driven gear during said second mode of operation in response to friction between mutually opposing portions of said driving gear and said driven gear; and   whereby transmission of said rotational force is prevented in response to mutual engagement of said first protruding part and said second protruding part in said third mode of operation. .Iaddend..Iadd.16. In a front-loading video cassette recorder including a mechanism for moving a cassette holder supporting a cassette tape between an initial position and a loaded position along a L-shaped path, an improved idling rotation mechanism comprising:   a driving gear operatively connected to a motor so as to receive transmitted rotational force, said driving gear comprising a first toothed portion, a continuous surface providing a first toothless portion and a first protruding portion; and   a driven gear operatively connected to an arm gear, whereby rotational force received by said driven gear from said driving gear produces displacement of said arm gear to thereby move said cassette holder along said L-shaped path, said driven gear comprising a complementary second toothed portion complementary to said first toothed portion, a complementary second toothless portion and a second protruding part;   whereby said rotational force is transmitted from said driving gear to said driven gear in response to meshing engagement of said first toothed portion and said complementary second toothed portion;   whereby said rotational force is transmitted from said driving gear to said driven gear in response to friction between said first untoothed portion and said complementary second untoothed portion; and   whereby transmission of said rotational force is prevented in response to mutual engagement of said first protruding part and said second protruding part. .Iaddend..Iadd.17. In a front-loading video cassette recorder including a mechanism for moving a cassette holder supporting a tape cassette from an initial position to a loaded position along a L-shaped path, an improved idling rotation mechanism having a first mode of operation and a second mode of operation, said improved idling rotation mechanism comprising:   a driven gear operatively connected to a side arm gear, said driven gear comprising a first protruding portion;   a driving gear operatively connectable to a motor so as to receive transmitted rotational force from the motor, said driving gear transmitting said rotational force to said driven gear during said first mode of operation to produce displacement of the side arm gear to thereby move the cassette holder along the L-shaped path, said driving gear comprising first means for operatively engaging said first protruding portion during said second mode of operation;   said driving gear and said driven gear having meshing engagement of mutually opposed teeth of each of said driving gear and said driven gear during said first mode of operation to enable said transmitting of rotational force from said driving gear to said driven gear during said first mode of operation; and   mutual engagement of said first protruding portion and said first means preventing said transmission of rotational force from said driving gear to said driven gear during said second mode of operation. .Iaddend..Iadd.18. The improved idling rotation mechanism of claim 17, further comprising said driving gear and said driven gear having mutually opposing and frictionally engagable portions, said driving gear frictionally engaging said driven gear during an intermediate mode of operation occurring between said first mode of operation and said second mode of operation. .Iaddend..Iadd.19. A process of operation of an idling rotation mechanism in a front-loading video cassette recorder including a mechanism for moving a cassette holder supporting a cassette tape between an initial position to a loaded position along a L-shaped path, a driving gear operatively connected to a motor so as to receive transmitted rotational force, said driving gear including a first toothed portion, a first toothless portion and first protruding portion, and a driven gear operatively connected to an arm gear, whereby rotational force received by said driven gear from said driving gear produces displacement of said arm gear to thereby move said cassette holder along said L-shaped path, said driven gear including a complementary second toothed portion complementary to said first toothed portion, a complementary second toothless portion and a second protruding part, said process comprising the steps of:   directly transmitting said rotational force from said driving gear to said driven gear through meshing engagement of said first toothed portion and said complementary second toothed portion;   frictionally transmitting said rotational force from said driving gear to said driven gear through interaction between said first toothless portion and said complementary second toothless portion; and   when one of said driving gear and said driven gear reaches a maximum rotational limit, preventing transmission of said rotational force in response to mutual engagement of said first protruding part and said second protruding part. .Iaddend..Iadd.20. An idling rotation mechanism in a housing of a video cassette tape recorder, comprising:   speed-variation means drivingly connectable to a motor so as to vary a transmitted rotational speed of the motor;   a cassette transporting holder engagable with a video cassette tape, said transporting holder being movable between an initial position and a mounted position;   drive means connectable to the cassette transporting holder and the speed-variation means, for moving the cassette transporting holder between said initial position and said mounted position;   cut off means on said drive means, for interrupting transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said speed-variation means comprising:   a worm drivingly connectable to an output shaft of the motor; and   a worm gear in meshing engagement with said worm;   said means for cutting off rotation comprising: a timing gear, rotatably mounted on a first shaft extending from said housing, in operational engagement with said worm gear, said timing gear having a gear part, with a portion of the timing gear covered by a sliding part, and a rotating plate having a cut-out portion; and   an arm gear, rotatably mounted on a second shaft extending from said housing, said arm gear having a geared part that can be in meshing engagement with said gear part, said geared part having a projection at an end portion so that when said projection is rotated along with the arm gear, the projection passes through the cut-out portion so as to contact an edge part of the rotating plate and cut off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part. .Iaddend..Iadd.21. A mechanism as claimed in claim 20, wherein said drive means comprises:     a side arm rotably mounted on said second shaft coaxially with said arm gear, said side arm being drivingly connectable to said arm gear and having means for engaging a guide pin connected to said transporting holder, so that the movement of the guide pin by the side arm, along a guide slot formed in a support plate of said housing, will cause the transporting holder to be moved in the housing; and   resilient means, connectable to said side arm, for engaging said guide pin. .Iaddend..Iadd.22. A mechanism as claimed in claim 21, wherein a relay gear, connectable to a gear portion on said side arm, can be rotated to open and close access doors to said housing. .Iaddend..Iadd.23. An idling rotation mechanism in a housing of a video cassette tape recorder, comprising:   speed-variation means drivingly connectable to a motor so as to vary a transmitted rotation speed of the motor;   a cassette transporting holder engagable with a video cassette tape, said cassette transporting holder being movable between an initial position and a mounted position;   drive means connectable to the cassette transporting holder and the speed-variation means, for moving the cassette transporting holder between said initial position and said mounted position;   cut off means on said drive means, for interrupting transmission of rotational forces from the motor to the drive means so as to prevent the cassette transporting holder from continuing to move after reaching the mounted position;   said cut off means comprising:   a timing gear, rotatably mounted on a first shaft extending from said housing, in operational engagement with said speed-variation means, said timing gear having a gear part, with a portion of the gear part covered by a sliding part, and a rotating plate having a cut-out portion; and   an arm gear, rotatably mounted on a second shaft extending from said housing, said arm gear comprising a geared part that can be in meshing engagement with said gear part, said geared part having a projection at an end portion so that when said arm gear is rotated, the projection passes through the cut-out portion so as to contact an edge part of the rotating plate and cut off the transmission of rotational forces of said motor after the geared part has been disengaged from the gear part.   
     
     
        .Iaddend..Iadd.24.  A mechanism as claimed in claim 23, wherein said drive means comprises: a side arm rotatably mounted on said second shaft coaxially with said ann gear, said side arm being drivingly connectable to said arm gear and having means for engaging a guide pin connected to said cassette transporting holder, so that the movement of the guide pin by the side arm, along a guide slot formed in a support plate of said housing, will cause the cassette transporting holder to be moved in the housing; and   resilient means, connectable to said side arm, for engaging said guide pin. .Iaddend..Iadd.25. A mechanism as claimed in claim 24, wherein a relay gear, connectable to a gear portion on said side arm, can be rotated to   
     
     
        open and close access doors to said housing. .Iaddend..Iadd.26.  An idling rotation mechanism in a housing of a video cassette tape recorder, comprising: speed-variation means drivingly connectable to a motor so as to vary a transmitted rotational speed thereof;   a cassette transporting holder positioned to receive a video cassette tape, said cassette transporting holder being movable between an initial position for receiving the video tape cassette and a mounted position enabling loading of tape from the video tape cassette;   drive means connectable to the cassette transporting holder and the speed-variation means so as to move the cassette transporting holder between said initial position and said mounted position;   idling rotation means having at least one idleable component so as to prevent further movement of the drive means after said cassette transporting holder has reached said mounted position, said idling rotation means comprising: a timing gear rotatably engaging and driven by said speed-variation means; and   an arm gear engaging said drive means, said arm gear being driven by said timing gear, said arm gear comprising a gearless outer circumferential portion and a geared outer circumferential portion, wherein said idling rotation means transmits rotational energy while said timing gear engages said geared outer circumferential portion and interrupts said transmission of said rotational energy while said gearless outer circumferential portion faces said timing gear. .Iaddend..Iadd.27. The idling rotation mechanism of claim 26, further comprising cut off means for stopping the rotational force from the motor to stop the idling rotation. .Iaddend..Iadd.28. The idling rotation mechanism of claim 27, comprising of said cut off means comprising:     a pin on said arm gear, and   stopper means on said timing gear, for engaging said pin, whereby after said cassette transporting holder reaches said mounted position, said pin abuts said stopper means so as to prevent said timing gear from rotating.   
     
     
        .Iaddend..Iadd.29.  The idling rotation mechanism of claim 26, comprised of: said arm gear comprising: said geared outer circumferential portion defining an arc of less than three hundred and sixty degrees, and   means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate member extending around a central axis of said timing gear, and a void interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear as said cassette transporting holder reaches said mounted   
     
     
        position. .Iaddend..Iadd.30.  The idling rotation mechanism of claim 26, comprised of: said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate surface extending around a central axis of said timing gear, and a void sector interrupting continuity of said surface and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.31. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate surface extending around a central axis of said timing gear, and a void sector interrupting continuity of said surface and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate surface accommodating rotation of said timing gear as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.32. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate surface extending around a central axis of said timing gear, and a void sector interrupting continuity of said surface and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate surface accommodating rotation of said timing gear after said cassette transporting holder has reached said mounted position. .Iaddend..Iadd.33. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate surface extending around a central axis of said timing gear, and a void sector interrupting continuity of said surface and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.34. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate surface extending around a central axis of said timing gear, and a void sector interrupting continuity of said arcuate surface and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate surface accommodating rotation of said timing gear as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.35. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void sector interrupting continuity of said member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear after said cassette transporting holder has reached said mounted position. .Iaddend..Iadd.36. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate array of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate array of teeth, said intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void sector interrupting continuity of said member and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.37. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate array of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate array of teeth, said intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void sector interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear after said cassette transporting holder has reached said mounted position. .Iaddend..Iadd.38. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate array of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate array of teeth, said intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void portion interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.39. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate array of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate army of teeth, said arcuate portion comprising an arcuate member extending around a central axis of said timing gear, and a void portion interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.40. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate army of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate array of teeth, said intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void portion interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.41. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending axially outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate army of teeth disposed to engage said geared outer portion and an intermediate portion coaxially disposed adjacent to said arcuate array of teeth, said intermediate portion comprising an arcuate member extending around a central axis of said timing gear, and a void portion interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear after said cassette transporting holder has reached said mounted position. .Iaddend..Iadd.42. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate member extending around a central axis of said timing gear, and a void interrupting continuity of said member and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.43. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising means for extending outwardly from said arm gear and toward said timing gear; and   said timing gear further comprising an arcuate member extending around a central axis of said timing gear, and a void interrupting continuity of said member and receiving said extending means as said cassette transporting holder reaches said mounted position, engagement of said extending means by said arcuate member accommodating rotation of said timing gear as said cassette transporting holder reaches said mounted position. .Iaddend..Iadd.44. The idling rotation mechanism of claim 26, comprised of:   said arm gear comprising: said geared outer circumferential portion defining an arc of less than three hundred and sixty degrees, and   means for extending outwardly from said arm gear and toward said timing gear; and     said timing gear further comprising an arcuate member extending circularly around a central axis of said timing gear, and a void interrupting continuity of said arcuate member and receiving said extending means as said cassette transporting holder reaches said mounted position. .Iaddend.