Patent GB-1058572-A (GB)
Title: Sewing machine
Inventor: DESPAIN THOMAS HARRY
IPC: D05B7/00
Filed: 1964-05-20
Abstract: 1,058,572. Linking machines. SOUTHERN TEXTILE MACHINERY CO. Inc. May 20, 1964, No. 20706/64. Heading D1G. A linking machine comprises a fixed frame journalling a drive shaft, a first housing pivotally mounted on the frame co-axially with the drive shaft, a point dial journalled on the first housing co-axially with the driveshaft, a second housing fixed to and projecting radially from one side of the first housing for supporting stitch-forming mechanism, and means in the first housing for coupling the point dial and the stitch-forming mechanism to the main shaft. As shown, a frame 22, fixed to a table 20, carries an overhanging arm 24, the free end of which journals a vertical shaft 64 coupled by a belt 54 to a shaft 36 which is journalled in frame 22 and is driven via fast and loose pulleys. A housing 26 is formed at its upper end with a spigot 74 journalled in arm 24 coaxially with shaft 64. Housing 26 is held in a position of angular adjustment by a screw 80. A housing 28, fixed to and projecting radially from housing 26, contains stitch-forming means. A circular dial plate 30, fixed to the lower end of housing 26, journals a point dial 32. Flanges 86, 88 in housing 26 journal a shaft 94 axially aligned with shaft 64. A sleeve 170, slidable on shafts 64 and 94, normally rests on flange 86 and is provided with diametrical pins 172, the lower one of which normally engages a shallow notch in shaft 94 and the upper one of which engages a deep notch in shaft 64 for coupling the latter to shaft 94. The latter is coupled by gears 98, 100 to a shaft 102 which is journalled in housing 28 and drives a looper 121 and a needle 123. Shaft 94 is also coupled by gears 190, 192 to a shaft 194, and the latter is coupled via gears 202, 216, 218 to a shaft 220 carrying a pinion meshing with a gear ring 242 on point dial 32. Gear 218 is releasably coupled to shaft 220 by a manually-operable clutch. Shaft 94 may be turned manually by a knot on shaft 194. The machine is arranged to be stopped or interruption of the thread supply. For this purpose a rod 140, rotatable and axially slidable in housing 28, abuts one arm of a bell crank lever 154, the other arm of which is connected by a link 160 to a yoke 162 which is pivoted at 164 and carries opposed pins diametrically engaging a circumferential groove 168 in sleeve 170. In normal operation, the outer end of an arm 176, pivoted at 178 in housing 28, is supported by the needle thread passing between a pair of fixed lugs 182, and the inner end of arm 176 engages a notch 180 in rod 140. A first arm 144 rigid with rod 140 is thereby raised to an upper position and a second arm 152, On breakage or exhaustion of the thread, the rigid with rod 140, is separated from an eccentric disc 184 on the needle-driving shaft 124. outer end of arm 176 falls to disengage the inner end from rod 140, whereby arm 144 falls to rotate rod 140 to engage arm 152 with disc 184. A pin carried by the latter thereby engages arm 152 to shift rod 140 towards the right, whereby yoke 162 is turned counterclockwise to raise sleeve 170 for disengaging the lower pin 172 from shaft 94 to uncouple the latter from shaft 64. Arm 144 is held in the lowered position by a pawl member 188. In a modification, Fig. 13 (not shown), a dial plate 30' is secured to a bowl-shaped member 250 supported by and journalled on a plate 254 rigid with a supporting pedestal. A lever 262, pivoted on plate 254, is selectively engageable with teeth circumferentially provided on member 250 for holding the latter in a position of angular adjustment.