Patent GB-471288-A (GB)
Title: Improvements in or relating to machines for sewing on buttons
IPC: D05B73/12
Filed: 1936-09-02
Abstract: 471,288. Sewing - machines. JACKSON, L. MELLERSH-. (International Button Hole Sewing Machine Co.) Sept. 2, 1936, No. 24050. [Class 112] In a machine for attaching buttons, the needle is movable laterally and the looper and throat plate are moved to follow the needle. The needle has a fore-and-aft movement in addition to the lateral vibratory motion to enable four-hole buttons to be attached. Throat plate. The bed 70 supports a throat plate 73 upon which the fabric W to which the buttons are to be attached is supported and against which it is clamped by a presser 74 carrying the button clamp 75. The throat plate has an opening 325 for the needle, Fig. 8, of a length corresponding to the maximum lateral movement of the needle. The plate is secured by rivets 326 to a slide 327 connected by a stud 329 to the sleeve 206a in the looper shaft 79 and moved with it to follow the fore-and-aft movement of the needle. Needle and looper movements. The main shaft 76 drives a vertical cam shaft 78 which in turn drives the looper shaft 79. The needle bar 81 is reciprocated by a crank pin 90 on the cam 89 and connected by a link 91 to a collar 92 on the needle bar. The take-up 88 is also operated by a peripheral groove in the cam 89. The upper bearing 93 for the needle bar is carried in a flexible disc 94 to allow universal movement. The lower bearing 96 is carried in a flexible disc 97 in a carrier 98 movable in two directions horizontally. In attaching two-hole buttons, the carrier 98 is oscillated laterally between successive descents of the needle 80 to cause the needle to pass alternately through the holes of. the button, the looper carrier 84 for the pair of loopers being oscillated with the needle by the shaft 79 which has a slip clutch 180 connected by a link 190 and pin 191 to an arcuate groove 192 in a lever 193. The lever 193 has a pin 195 engaging a groove 197 in the main cam 129. In attaching four-hole buttons, the same operations are effected to produce one series of stitches, after which the carrier 98 and throat plate are shifted longitudinally to register the second pair of holes with the needle. The carrier 98 is guided in a grooved member 106 pivoted at 107 in the frame. The carrier 98 is oscillated about the pivot 107 to vibrate the needle by a link 113, Fig. 6, with a stud 120 received in an arcuate groove 121, in a lever 122 secured to a shaft 123. The opposite end of the lever 122 has a pin 125 engaging a groove 127 in the upper face of the main cam 129 on the shaft 78. The amplitude of the needle vibration depends on the position of the stud 120 in the slot 121 and is adjusted to suit the holes in the bottom by a fork 131 engaging a stud 130, the fork being carried by a slide 132 and operated by a clamping screw 135 exterior to the casing. The carrier 98 is moved fore-and-aft by a link 146 having a stud 151 engaging a groove 152 in an arm 153 secured to a vertical rock shaft 154. The shaft 154 has an arm 155 pivoted to a link 156 to which is secured a pair of follower blocks 161 co-operating with an edge cam 162 driven from the shaft 78. The amplitude of the fore-and-aft movement is determined by the position of the stud 151 in the groove 152 and is adjusted by a fork 165, Fig. 1, operated by the exterior lever 169. The fore-and-aft shifting of the looper shaft to move the loopers to maintain their correct relation with the needle is effected by a rock shaft 150, Fig. 6, with an arm 149 connected to the link 146 and having a second lower arm connected by a link to a collar on the looper shaft 79.