GB224527A - Automatic embroidering machine - Google Patents

Abstract

224,527. Singer Manufacturing Co., (Assignees of Myers, W.). Nov. 5, 1923, [Convention date]. Universal-feed machines.-The feed-direction is controlled by a continuously rotating pattern cam, and the pattern is varied by stopping the stitching and feeding during selected portions of the feed direction cycle. The stitching and feeding mechanisms are described in Specification 152,092, and are provided with a usual stopping device, which includes a cam 38 pressed to the right on the shaft 8 by a spring 41 so as to carry a pin 40 riding in a hole in an eccentric 36 fast on the shaft 8 into a hole in the gear wheel 109 fast on the pulley shaft 5. The cam causes a lever 42 to oscillate during stitching, and when that oscillation is prevented by a block 46, which can be raised into the path of the end of the lever 42, the cam is forced to the left and the stitching and feeding shaft 8 is uncoupled from the pulley shaft. The feed-direction cam disc 51 is rotated by a ratchet-pawl 82, pitman 87 and an eccentric 88 on a continuously rotating shaft 97 geared to the pulley shaft by bevel-wheels 108, 109. The cam-groove 52 is entered by a roller on a pivoted plate 55 formed with a toothed rack 58 by which the feed-direction shafts 28, 29 and 31 are controlled. The size of the pattern is changed by altering the eccentricity of the eccentric 88 and so varying the throw of the ratchet pawl. The eccentric comprises a disc 94, Fig. 4, fixed on the shaft 97 and a bush 89 slidingly mounted in a groove 93 on the disc. The parts are secured together by screws 102 and the bush can be moved in the groove to enable a positioning pin 107 to pass through one of the holes 104 in the disc into one of the holes 106 in the bush. Interchangeable ratchet wheels 74 with tooth pitches corresponding to the three throws of the eccentric may be provided. The character of the pattern can be varied by cutting out parts of the complete pattern provided for by the cam-groove. This is effected by stopping the stitching and feeding operations during selected portions of the rotation of the cam disc. To this end, screws 112, 113 are placed in two lines on the periphery of the cam disc and their heads alternately engage sloping surfaces 116, 117, Fig. 5, on a lever 121 and move that lever first to one side and then to the other. One movement of the lever causes a toe 132 to rise out of contact with a bar 133 which is then raised by a spring with the stopping block and the shaft 8 is declutched. Subsequent movement of the lever in the other direction depresses the rod 133 and the stitching and feeding mechanism are re-started. For turning corners for example, the cam control of the feeddirection can be suspended by means of a lever 67 carrying an eccentric pin. When the lever is turned, a sleeve 64 integral with the pinion which engages the rack 58 is moved on the shaft 28 against a spring, and its clutching surface 60 is separated from a similar surface on the collar 61 on the shaft 28.