Patent GB-174164-A (GB)
Title: Improvements in or relating to stitch-separating machines
IPC: A43D91/00
Filed: 1920-10-15
Abstract: 174,164. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Oct. 15, 1920. Separating and indenting stitches. -A stitch-separating and indenting machine is arranged so that the in. denting tool, connected to move relatively to its actuating means to allow of stitch interval location, is oscillated both to locate the stitch intervals and to feed the work. In the machine shown, the indenting tool 20 is secured in the holder 28 which is mounted on a vertical pivot in a carrier 30, pivoted by a horizontal pivot-pin 32, to a tool support 34. The outer end of the holder 28 is positioned between an abutment 40 and guides 42, and is normally held in engagement with an adjusting screw 44 by a spring 46, and kept in central position between the guides by means of leaf springs 113 mounted on opposite sides of the supporting lever and bearing on plungers 114 slidably mounted on the guides. The support 34 is pivotally suspended on a rod 52 fixed in the arms of the yoke formed on the free end of the lever 54, secured to a shaft 56 which is operated through a cam-lever 60 by a driving-cam 66 secured to the main shaft 68. As the support 34 is moved downwardly, the tool 20 comes into contact with the sole edge and the tool with its holder, then rotates about the pivot 32 until the abutment 40 comes into contact with the upper edge of the holder 28, when further downward movement forces the tool into the sole to indent it. During the downward movement of the support 34, the tool is moved outwardly towards the upper to extend the indentation up to the junction of the upper and sole. While the tool is in its indenting position it is reciprocated to feed the work, this being effected by the action of a cam 74, mounted on the driving shaft 68, upon a plate 70 secured to the lower end of the support 34. The plate 70 is urged towards the cam 74 by a spring 76 which retracts the tool after its feeding movement. To control the return movement of the tool and so vary the feeding movement, a rod 78 is provided to engage a projection on the plate 70 as it is drawn backwards by the spring 76, thus freeing it from control by the cam. The forward end of the rod 78 is pivotally connected to a supporting link 80 and the rear end engages a cam plate 84 secured to a shaft 86, the position of the rear end of the plate 84 being adjusted by a hand lever 90, connected to the rod 78 by a link 88. The hand lever 90 also operates a stopping lever 103 adapted to engage pins 106 threaded through openings in the casing. The interval locating vibration of the tool is obtained by oscillation of the rod 78 by means of a cam lever 108, the cam roll 109 being mounted on a pin slidable in an arcuate slot in the lever 108, so that the amplitude of vibration of the tool may be varied. The face of the cam plate 84 is so designed that this variation will be proportional to the variation in the feeding movement of the tool. While the support 34 is being vibrated to locate the tool in the stitch interval, the holder 28 may move about the vertical pivot in the carrier 30, the leaf springs 113, adjustable by a screw 124, allowing the tool to drag on the sole edge until it moves into the stitch interval. The work is supported on a table 22, adjustably mounted in a block 130 which slides in a dovetailed groove in the upper end of the shank 140 to permit of adjustment in the line of feed. The table is urged upwardly against the presser feet 24, 26 by a spring 146, a stop limiting this movement, and a treadle, connected to the rod 144 is provided to lower the table for insertion of the work. During the indenting operation the table is locked in position by a lever 154, provided with a gear segment 156 engaging a rack 158 on the shank 140, and after each feeding stroke of the tool the table is unlocked by a releasing lever 166 which, driven from the main cam 66, operates a number of pawls 162 engaging in a ratchet 160 formed on the rear end of the locking lever 154. The timing of the locking pawls is varied by adjusting the actuating rod 176. The presser feet 24, 26, adapted to engage the sole edge and guide it while it is being indented, are adjustable, vertically to vary the depth of the indentations, and transversely of the line of the feed by screws 200, 206, adapted to receive in their threads, pins which project upwardly from the presser feet. The foot 26, mounted in a vertically adjustable block 204, is arranged to project slightly below the foot 24 and is also adjustable in the line of feed, simultaneously with the adjustment of the feeding movement, by a slide 220 having a pin-and-slot connection with an arm 224 projecting from the hub of the handlever 90. To prevent the feet 24, 26 from dragging on the sole edge during the feeding movement, the carrier 194, operated from the main cam 66, is arranged to swing outwardly during the feeding movement and so release the pressure of the feet. The clutch for operating the main driving shaft 68 comprises a vertically sliding block 268, operated by a foot treadle and adapted on being raised to force the pins 262, sliding in the hub of a member 258 secured on the shaft, against a plate 264, and so move the driving pulley 250, against the action of a spring 254, out of engagement with the member 258.