GB224469A - Improvements in and relating to buttonhole sewing machines - Google Patents

Abstract

224,469. Imrie, H., (Reece Button Hole Machine Co.). May 21, 1924. Button-hole sewing-machines of the kind in which the stitch-forming mechanism is rotated at one end of the button-hole to form an eye, are provided with means for interrupting the stitching at will during the rotation so as to produce a straight button-hole. In the construction shown, a frame 5 supporting the stitch-forming means is moved to and fro on the bed-plate. The stitching devices are rotated about a vertical axis by a shaft 7. The driving shaft 10 for the stitching device is driven by a pulley 11 clutched thereto by a clutch of known type comprising a spring dog 12 pivoted at 98 to a hub 99 fast on the shaft and engaging a cam 13 on the pulley 11. The clutch is disengaged by a head 17 carried by a rocking member 19 held in inoperative position during stitching by a latch 22 engaging a projection 23. At the conclusion of a cycle a screw 28 carried by the latch 22 engages a fixed stop and releases the rocking member 21 to stop the shaft 10. In order to stop the shaft when desired while the mechanism is rotating about the end of a button-hole, the latch 22 is provided with a tail 29 adapted to engage an abutment 30 as the frame 5 reaches the end of its traverse. After the stitch-forming devices have made their half-rotation, the shaft 10 is again clutched to the driving pulley by the operation of means comprising a latch 33 which snaps over the end of the arm 21 of the rocking member 19 and, as the frame is retracted, turns the rocking member into a position to be re-engaged by the latch 22. In order to provide for the sewing of an ordinary eyelet-ended button-hole when desired, the abutment 30 is mounted on a pivoted arm 33 which may be swung aside by movement of a fingerpiece 39.