Mode changing system for a cassette tape recorder

Abstract

This invention relates to a mode changing system for a cassette tape recorder in which operating members such as a head base plate and a pinch roller are selectively moved to one of various modes such as stopping, fast forwarding, rewinding, pausing, cueing and playing. This system comprises control means to control the operating members so as to move them to a position corresponding to a selected one of the modes. The control means is actuated by a control electric motor. The system further comprises a mode selective switch group to select one of the modes, a reference signal generating circuit to generate a reference signal corresponding to the selected one of the modes in accordance with the selection of the modes by means of the mode selective switch group, a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of the control electric motor and an operational circuit to receive both of the reference and variable signals so as to rotate the control electric motor for moving the operating members toward the position corresponding to the selected mode.

What is claimed is: 
     
       1. A mode changing system for a cassette tape recorder wherein operating members such as a head base plate and a pinch roller are moved in accordance with operating modes of said cassette tape recorder comprising: control means to control movement of the operating members to take a position corresponding to a selected mode of said cassette tape recorder;   a .Iadd.bidirectional .Iaddend.control electric motor to actuate said control means;   a mode selective switch group to select one of said modes;   a reference signal generating circuit to generate a reference signal corresponding to the selected one of said modes in accordance with the selection of said modes by means of said mode selective switch group;   a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of said control electric motor; .[.and.].   an operational circuit to receive said reference signal at one of its inputs and said variable signal at the other input to compare said signals to generate a control output so as to rotate said control electric motor, said operational circuit being associated with said control means and said variable signal generating circuit so that said control output is generated for rotating said control electric motor when said operating members are at a position different from the position corresponding to the selected mode and for stopping said control electric motor when said operating members reach the position corresponding to the selected mode.Iadd.;   said control means including a rotary cam means having an advancing rotary range in which said operating member is advanced for engagement with a cassette tape and a retracting rotary range in which said operating member is retracted from the tape corresponding to a plurality of retracting modes, said retracting modes being placed together on said rotary cam means; and   said cam means being reversibly driven by said motor within a predetermined rotary angular range including said advancing and retracting rotary ranges corresponding to the selected operation of said mode selective switch group.Iaddend..   
     
     
       2. A mode changing system for a cassette tape recorder as set forth in claim 1, said reference signal generating circuit generating a reference voltage and said variable signal generating circuit generating a variable voltage. 
     
     
       3. A mode changing system for a cassette tape recorder as set forth in claim 2, said operational circuit generating such a control output that said control electric motor is rotated in a direction in which the level of said variable voltage varies toward the level of said reference voltage and that said control electric motor is stopped when the level of said variable voltage becomes equal to the level of said reference voltage. .[.4. A mode changing system for a cassette tape recorder as set forth in claim 1, wherein said control means comprises cam means to move said operating members in accordance with the rotation of said control electric motor..]. .[.5. A mode changing system for a cassette tape recorder as set forth in claim 4, said reference signal generating circuit generating a reference voltage and said variable signal generating circuit generating a variable voltage..]. .[.6. A mode changing system for a cassette tape recorder as set forth in claim 5, said operational circuit generating such a control output that said control electric motor is rotated in a direction in which the level of said variable voltage varies toward the lever of said reference voltage and that said control electric motor is stopped when the level of said variable voltage becomes equal to the level 
     
     
        of said reference voltage..]. .Iadd.7.  A control system for a cassette type tape recorder comprising a head base plate on which head means for a cassette type tape recorder is mounted, rotary cam means to move said head base plate corresponding to at least one advancing mode in which said head means engages a magnetic tape in a cassette and a plurality of retracting modes in which said head means is disengaged from said magnetic tape, a mode selective switch group operable so as to select one of said at least one advancing mode and said plurality of retracting modes, and a control motor driven in response to the selective operation of said mode selective switch group in a controlled manner to rotate said cam means to a predetermined rotary position in accordance with the selected mode, characterized in that; said cam means has an advancing rotary range in which said head base plate is advanced corresponding to said advancing mode and has a retracting rotary range in which said head base plate is retracted corresponding to said retracting modes, said retracting modes being placed together; said control motor being reversible; said cam means being reversibly controlled within a predetermined rotary angular range comprising said advancing and retracting rotary range relative to reversible rotation of said control motor corresponding to the selected operation of said mode selective switch group;   a reference signal generating circuit to generate a reference signal corresponding to the selected one of said modes in accordance with the selection of said modes by means of said mode selective switch group;   a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of said control electric motor; and   an operational circuit to receive said reference signal at one of its inputs and said variable signal at the other input to compare said signals to generate a control output so as to rotate said control electric motor, said operational circuit being associated with said control means and said variable signal generating circuit so that said control output is generated for rotating said control electric motor when said operating members are at a position different from the position corresponding to the selected mode and for stopping said control electric motor when said operating members reach the position corresponding to the selected mode. .Iaddend.