Patent GB-741301-A (GB)
Title: Improvements in or relating to machines suitable for separating stitches
IPC: A43D91/00
Filed: 1952-11-14
Abstract: 741,301. Stitch-separating machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Nov. 13, 1953 [Nov. 14, 1952], No. 28725/52. Addition to 671,015. Class 17 (1). The machine according to the Claims 1 and 4 of the parent Specification is modified in three respects, as follows: (1) the work feeding member 20 is connected by a link 56 to a slide 64 adjustably mounted in an arcuate guideway 66 which is rocked through a predetermined angle to impart to the member feeding and return movements, the extent of which is determined by the position of the slide in the guideway; (2) the orbital motion is imparted to the work feeding member by the power-operated guideway 66, as in (1) above, imparting movement along the line of feed and a pair of toggle links 126, 132 which are alternately straightened and broken by power means to move the member into and away from engagement with the work; and (3) liquid is forced periodically into the lower part of the air chamber 266 by automatic means to maintain the air in the chamber at a predetermined pressure. Eccentrics on shaft 36, which is driven through pulley 40 or turned by handwheel 42 and is counterweighted adjacent the eccentrics, actuate rod 142 to operate toggles 125, 132, rod 80 which through 76, hub 70 and flange 68 (not shown) connecting 66 and 70, swings guideway 66 about shaft 72, rod 148 to operate the indenting tool 22, rod 232 which through 228 oscillates the bracket 172 to raise and lower the presser feet 24, 26, and rod 278 to reciprocate the valve plunger 270. Arm 44 carrying member 20 moves about a vertical axis 48 and transverse axis 52. The axis of guideway 66 is a vertical line passing through the joint 58 between link 56 and arm 44, when member 20 is most advanced, i.e. leftwards in Fig. 3, ensuring that member 20 will always terminate its stroke at the same point regardless of the adjustment of slide 64, but an initial adjustment may be made by means of a turnbuckle on link 56. The position of slide 64 is adjusted through 88, 90, sleeve 92, 96, 98, 102 by means of a handle 110 on arm 112 which is normally spring pressed upwardly to a position in which it operates a radial locking member and is depressed for operation. A pointer 124 and scale indicate the degree of adjustment. This adjustment of the feed stroke also acts from sleeve 92 through 210 (not shown), 204, 190, 188, 184 to adjust member 24 in the direction of feed. Members 24 and 26 are each adjustable forwardly and rearwardly, and member 26 is adjustable lengthwise and transversely. The depth to which the indenting tool 22 descends is adjusted by turning a shaft 156 an eccentric portion of which is engaged by the arm 154 constraining the tool. The rotary work-table 28 is adjustable on a head 242, as in the parent Specification, the head being mounted on a plunger 244 in a hydraulic cylinder 248 for up and down movement and locking in the upper position. The oleo-pneumatic system is illustrated in Fig. 15. When the plunger is as shown in Fig. 15 fluid under pressure passes through 264, 260, 258, 252, 250 to cylinder 248 raising table 28. As the plunger rises port 252 is closed so that the table is locked, and port 286 is opened so that oil is drawn from the sump through 292 to the space below the plunger. As the plunger descends port 286 is closed and the oil below the plunger is forced through 288, check valve 294, filter 298, 302, relief valve 306 (gauge 310 indicating the pressure) and 309 to drip to lubricate the system. This oil also passes from filter 298 through 314 needle valve 316 (gauge 318 indicating the pressure) and 264 to 266 to maintain the pressure in the latter. The table is lowered in opposition to the air pressure by depression of a treadle connected by rod 320 to the head 242.