Patent GB-392580-A (GB)
Title: Improvements in or relating to shoemaking or to sewing machines adapted for use therein
IPC: D05B65/00
Filed: 1931-11-19
Abstract: 392,580. Boot-sole sewing-machines. UNITED SHOE MACHINERY CORPORATION, Paterson, New Jersey, U.S.A.- (Assignees of Leveque, B. T. ; Wenham, Massachusetts, U.S.A.) Nov. 19, 1931, No. 32070. Convention date, Nov. 24, 1930. [Class 112.] Boot-sole stitching and lasting.-In a machine for lasting and stitching veldtschoen, the margin of the upper is engaged and pressed to the sole by a rotating roll-like member. The under side of the sole is engaged by another member which is also preferably a roll. Means are provided for rotating the rolls between stitches to feed the shoe and for forcing the shoe longitudinally of the roll as it is fed. The upper roll is rotated at such a speed relative to the under feed member that a gathering effect is produced to dispose of the fullness of the upper. The work is stitched by a straight needle operating near the point where the rolls grip the work, co-operating with a loop taker and thread cutter. The inventon can be used for stitching other goods. As illustrated, the machine comprises a head 2 supported on a pedestal 4 housing a driving motor 6 with two belts 8, 10 and a clutch 12 controlled by a starting and stopping treadle 14. A starting box 16 for the motor and a holder 24 for the sewing thread are also provided on the pedestal. Stitch-forming mechanism. These comprise a straight eyed needle 28 and a rotating loop taker 30 of usual design fixed on the shaft 32. These co-operate to form a single-thread chain stitch, Fig. 19. The needle bar 34 is mounted in bearings in the frame 36 and is actuated by a bell crank 38 pivoted on a horizontal stud 40, Fig. 6. A second bell crank 58 actuates the bell crank 38 and is driven by a rod 84 attached at its lower end to a cranked part of the driven shaft 32. The length of the rod is made adjustable to adjust the stopping point of the needle at the end of its downward stroke. The bell cranks 38, 58 are connected by latch mechanism which can be disconnected readily to cause the needle to stop at the exact point of disconnection without jar even when the machine is operating at high speeds. This disconnection takes place as the first action of the stopping movement, the shaft 32 then gradually losing momentum and finally coming to rest. Starting and stopping gear. A treadle controlled rock shaft 116 is connected to the starting and stopping treadle 14 by links 122, 124. A spring 131 tends to lift an arm 128 fixed to the rock shaft. and rotate it to its stopping position. The link 124 is connected by an arm 138 to a jack shaft 140 carrying an arm 143 which has a finger operating the clutch which couples the motor 6 to the machine. This clutch unit comprises a driving pulley 148 connected by the belt 8 with the motor 6 and fixed to a shaft carrying the pulley 154 over which the belt 10 passes. The belt 10 runs over another pulley 156 to the machine shaft 32. Lasting. The mechanism for drawing the upper over the last consists of a pair of intermittently rotated rolls 180, 182 which grip between them the marginal portions of the upper and sole, Fig. 10. The lower roll 182 is rotatably mounted on the forward end of the shaft 32. The rear end of its hub has lugs for engaging notches in a sleeve 186 also rotatable mounted in the shaft 32. As the needle bar rises, a link 220 pulls up the horizontal arm of a bell crank 214, moving the other arm and its attached link 210 rearwardly to member 206 to drive and rotate the short shaft 200. This rotates the member 182 through the spiral gearing 196, 194. The parts are arranged so that no rotation of the roll 182 occurs till the needle bar has lifted the needle clear of the work. The upper roll 180 is mounted on a stud 226. The inner end of its hub operatively engages the hub of a helical gear 242 also mounted on the stud 226. This helical gear is driven by a gear 244 on a shaft 246 driven by a clutch connection through a link 252 pivoted to a bell crank 254, connected by a link 256 to the lower end of the needle bar actuating bell crank 38. This link 256 has a plunger 259 engaging any one of a series of holes 260 in a segment 262 to regulate the angular position of the shaft 216. This adjusts the eccentric portion 258 and so the centre on which the bell crank 254 swings towards or from the end of the needle bell crank 38. The result is to vary the rate of rotation by which the upper roll exceeds to the lower roll. The rolls are opened or closed by a toggle connected to the pivoted supporting member 232 in which the upper roll 180 is mounted. One member of the toggle consists of an upstanding pin 264, Fig. 6, pivoted to the side of the socket 230 and the member 232, and having one of its ends rotating in a bearing in an arm 270 of a pivoted member 272. When the member 272 is swung in one direction about its stud 274, the pin 286 engages the stud 268. The pin 264 then lifts the member 232 to move the upper roll away from the lower roll. The upper roll is pressed towards the lower roll by a spring 288. A hook 300 controlled by the treadle-controlled rock shaft 116 imparts the necessary swing of the member 272 The work is not only supported by the lower roll 182, but also by the work support 316. In addition to the upper roll, a guide 238 is provided on the outer end of the stud 236 supporting the upper roll 180. This guide prevents the needle from contacting with the shoe upper and bears against the shoe to form a guide. Thread-cutters. A curved blade 344 is mounted on a lever 348 urged by a spring 352 to bring it across the path of the needle just below the top of the work support 316. The support is cut away to admit the blade between it and the lower feed roll. When the upper roll 180 is raised to free the work, the member 272 permits the spring to actuate the blade to cut the thread. The usual tension device 376, pull off 380 and take-up 410 are provided.