Patent GB-191510997-A (GB)
IPC: D05B3/16
Abstract: 10,997. Fairweather, W., [Singer Manufacturing Co.]. July 29. Sewing-machines; lock-stitching by shuttles; needles, driving; governing needle threads; needles vibrating laterally.-The needle-bar 30 and loop-taker 23 are mounted in a vertically-arranged frame 31 which is nivoted at 34 on the machine frame and is vibrated laterally by a cam 58 to place the stitches alternately through and outside of the button-eye. The needle-bar is reciprocated by a crank-pin 38 and pitman 39, and the loop-taker is oscillated by the axial movement of a threaded sleeve 27 over a screw 26. The cam 58 is carried by a spindle 53 sliding within a hollow shaft 43, which is rotated once for every two stitches by gear-wheels 52. The needle thread is governed by a take-up 5, slackthread controller 13, and tension disks 12. The tension disks are separated by an arm 14 when the work-clamp is raised. Button-attaching machines.- The zigzag stitches securing a shank button are preceded and followed by a few trying-stitches. The whole operation is controlled and the machine brought to rest by means of a cam 70 which is rotated step by step by a ratchet gear from the shaft 43, and in a direction opposite to that of the shaft 43. At the commencement of a cycle, the spindle 53 is held from rotation by a screw 55 upon it, which is engaged by a slot in a bracket 63. When the trying-stitches are completed, the cam 70 permits a spring 54 to move the spindle 53 to the left, and the spindle becomes coupled to the surrounding tubular shaft 43 by a pin 57, which passes into a hole in the flange 45. Thereafter, the frame 31 is rocked by the cam 58 to place stitches alternately inside and outside of the button-eye until the cam 70 presses the spindle 53 to the right and the final group of trying-stitches are made. The button is held on to the work by a spring-closed clamp, the upper member of which has a spring latch 107, Fig. 3, which grips the button shank. The clamp arm 18 is connected to an arm 92 the boss of which is resiliently held between parts 97, 87 upon a rod 80. Starting and stopping gear.- As described in Specification 10,996/15, the combined hand-wheel and driving-pulley 4 carries a leather ring 127 embraced by plates 128, 130 secured to rotate with the shaft 3. Normally, springs 132 cause the plates to grip the leather ring, and the shaft 3 is driven. Conical surfaces 137 are formed on rings 134, 139. The latter ring is secured to the plate 130, and the former carries pins 136 which contact with the plate 128. When wedge-shaped brake blocks 149 are forced between the surfaces 137, the rings 134, 139 are forced apart and cause the plates 128,130 to move away from the leather ring, and thereby the machine is stopped. The wedge-shaped brake blocks 149 are carried by levers 146 linked to crank-arms on a shaft 142, to which is secured a lever 152. The lever 152 is pressed upon by the rod 80 under the influence of a spring, but is normally held by a latch 157. At the close of a stitching cycle, the latch is removed by the cam 70 and the lever 152 is forced downward, causing the brake blocks to engage the surfaces 137 and disengage the clutch parts. The downward movement of the lever 152 also brings a stop piece 167, pivoted on an arm 165 of the shaft 142, into the path of a part 37 on the main shaft, and when these impinge, the piece 167 is forced forward and the movement is transmitted through the arm 165 and the shaft 142 to the back blocks, so bringing the machine positively to rest. Thread-cutters and thread-end holders.- Simple resilient thread cutting and thread-end holding plates are provided on the presser-foot and throatplate for the needle and to open threads. The machine shown is similar to that described in Specification 9688/14.