Embroidery sewing machine

Abstract

An embroidery sewing machine is capable of performing embroidery on both flat cloth and cylindrical cloth by selectively attaching a flat frame and a cylindrical frame. The embroidery sewing machine includes a cylinder bed, a first carriage movable in a first direction, a first driving unit moving the first carriage in the first direction, a second carriage having a flat frame attachment part to which a cylindrical frame is detachably attached and which is movable in a second horizontal direction perpendicular to the first direction, a cylindrical frame drive unit having a cylindrical frame attachment part to which a cylindrical frame is detachably attached and supported by the first carriage so as to be rotatable about an axis parallel to the first direction, a second driving unit driving either second carriage or cylindrical frame drive unit and a rack-and-pinion mechanism including a rack member mounted on the second carriage and a pinion mounted on an outer periphery of the cylindrical frame drive unit and having a reference pitch diameter substantially equal to an outer diameter of a cloth stretching surface of the cylindrical frame, either one of the rack member and the pinion transmitting driving force to the other.

1 . An embroidery sewing machine, capable of performing embroidery on both flat cloth and cylindrical cloth by selectively attaching a flat frame to hold flat cloth and a cylindrical frame to hold cylindrical cloth, the embroidery sewing machine comprising: 
 a cylinder bed;    a first carriage set to move in a first direction in which the cylinder bed extends;    a first driving unit which moves the first carriage in the first direction;    a second carriage having a flat frame attachment part to which a cylindrical frame is detachably attached and which is movable in a second horizontal direction perpendicular to the first direction;    a cylindrical frame drive unit having a cylindrical frame attachment part to which a cylindrical frame is detachably attached and supported by the first carriage so as to be rotatable about an axis parallel to the first direction;    a second driving unit driving either second carriage or cylindrical frame drive unit; and    a rack-and-pinion mechanism including a rack member provided on the second carriage and a pinion provided on an outer periphery of the cylindrical frame drive unit and having a reference pitch diameter substantially equal to an outer diameter of a cloth stretching surface of the cylindrical frame, either one of the rack member and the pinion transmitting driving force to the other.    
   
   
       2 . The embroidery sewing machine according to  claim 1 , wherein the second driving unit drives the second carriage in the second direction so that a resultant driving force is transmitted via the rack-and-pinion mechanism to the cylindrical frame drive unit.  
   
   
       3 . The embroidery sewing machine according to  claim 1 , wherein the second driving unit rotates the cylindrical frame drive unit so that a resultant driving force is transmitted via the rack-pinion cylindrical mechanism to the second carriage.  
   
   
       4 . The embroidery sewing machine according to  claim 1 , wherein the cylindrical frame has a cylindrical connection part which is connected to the cylindrical attachment part of the cylindrical frame drive unit so as to be fitted with an outer periphery of the cylindrical attachment part.  
   
   
       5 . The embroidery sewing machine according to  claim 4 , wherein the cylindrical frame including the cylindrical connection part is integrally made from a synthetic resin and the cylindrical frame drive unit is made from a synthetic resin.  
   
   
       6 . The embroidery sewing machine according to  claim 4 , wherein the cylindrical frame attachment part and cylindrical connection part are provided with positioning fitting portions determining relative positions of the cylindrical frame attachment part and cylindrical connection part in rotating directions by fitting respectively.  
   
   
       7 . The embroidery sewing machine according to  claim 1 , wherein the reference pitch diameter of the pinion is slightly smaller than an outer diameter of the cloth stretching surface of the cylindrical frame.  
   
   
       8 . The embroidery sewing machine according to  claim 1 , wherein the pinion comprises a profile-shifted gear and the profile-shifted gear has a working pitch circle with a diameter slightly smaller than an outer diameter of the cloth stretching surface of the cylindrical frame.  
   
   
       9 . An embroidery sewing machine, capable of performing embroidery on both flat cloth and cylindrical cloth by selectively attaching a flat frame to hold flat cloth and a cylindrical frame to hold cylindrical cloth, the embroidery sewing machine comprising; 
 a cylinder bed;    a first carriage set to move in a first direction in which the cylinder bed extends;    a first driving unit which moves the first carriage in the first direction;    a second carriage having a flat frame attachment part to which a cylindrical frame is detachably attached and which is movable in a second horizontal direction perpendicular to the first direction;    a cylindrical frame drive unit having a cylindrical frame attachment part to which a cylindrical frame is detachably attached and supported by the first carriage so as to be rotatable about an axis parallel to the first direction;    a second driving unit driving either second carriage or cylindrical frame drive unit; and    a rack-and-pinion mechanism including a rack member provided on the second carriage and a pinion provided on an outer periphery of the cylindrical frame drive unit, the rack-and-pinion mechanism transmitting a driving force of the second carriage to the cylindrical frame attachment part.