Patent GB-687260-A (GB)
Title: Improvements in or relating to machines for roughing shoe parts
IPC: A43D37/00
Filed: 1951-11-22
Abstract: 687,260. Roughing shoe soles. BRITISH UNITED SHOE MACHINERY CO., Ltd. Nov. 22, 1951. [Nov. 24, 1950] No. 27386/51. Class 31 (i). A machine for roughing the margin of the sole 32 of a shoe prior to cementing it to the upper comprises a rotatable roughing tool 38, Fig. 12, a work support 56, 58, and an edge gauge 64 which are so mutually positioned in the machine that the tool is offset relatively to the workpiece to an extent that causes its axis of rotation to be outside an edge portion of a workpiece supported by the support and engaging the edge gauge. The edge gauge is so located that the portion of it engaged by the workpiece lies between the axis of rotation of the tool and the portion of the work support engaged by the workpiece, the tool has teeth lying on a frusto-conical surface, the work support consists of concentricallymounted sleeves 56, 58, and a pair of rotary work-feeding members 60, 62 are provided. All three members, except the tool, are directly supported upon the main machine frame 78, and the tool 38 is rotatable in an arm 160 which is pivoted to the frame 78 so that the tool can be swung between operative and inoperative positions ; in the operative position, the axis of the tool is tilted forwardly slightly from the vertical. A work table 52 on the frame supports the main part of the sole 32 while its margin is engaged by the support, gauge, and feeding members. The concentric sleeves 56, 58, Figs. 4 and 7, forming the work support, are mounted for rotation with a surrounding sleeve 72 and have flat upper edges for engagement by the sole ; the sleeves are yieldable vertically independently of each other, the depending shank of each sleeve being engaged by one end of a spring-pressed lever, Fig. 5 (not shown), which urges it upwardly within pre-determined limits. The edge gauge 64 is secured inside the sleeve 56 by a screw 90. Rotation of the sleeves 56, 58 and gauge 64 is effected from a motor-driven shaft 210, Fig. 7, through gearing 214, 74. The tool 38, Fig. 4, comprises a cylindrical head 130 on a shaft 131 which is mounted in a swingable arm 160 and rotated from an electric motor through belt and pulley gearing 196. Toothed blades 136, Fig. 13, together with presser feet 134, are secured by screws 144 in slots 138 in the head so that the blade teeth project from the end face thereof with the leading tips 151 of each set of teeth lying in a frusto-conical surface generated about the axis of the head and disposed preferably at an angle of about 4 degrees to a plane at right angles to the said axis. The bottom edges of the blades are also provided with teeth and rest upon flanges 143 on the feet 134. If desired, the alternate teeth of each blade shown in Fig. 13 may be omitted to provide clearance spaces. In operation, the axis of the tool is tilted forwardly at an angle of about 4 degrees to the vertical. The arm 160 is rotatably mounted upon a pin 328, Fig. 4, which has a threaded end engaged by the nut portion 330 of a cam lever 332 ; the arm is also pivotally connected to a bell-crank lever 338 which is normally engaged by a spring-pressed latch 342. When the lever 332 is swung in counterclockwise direction from the operative position shown in Fig. 4, the nut is withdrawn from locking engagement with the arm, and lever mechanism is actuated to disengage the latch 342 so as to permit the arm to be swung rearwardly into inoperative position. A second edge gauge 66, Figs. 7 and 9, is mounted on a vertical shaft 232 rotatable in a beam 174, which is mounted for slight angular adjustment about the axis of the sleeves 56, 58. Rotation of the gauge is effected from the motordriven shaft 210 through gearing 224 ... 236, some of which gears are on the frame 78 and others on the beam 174. The feed roll 60, Figs. 7, 9 and 12, comprises a rubber-covered steel core 254 rotatable in a carrier 260 which is pivoted on a rotatablymounted shaft 262 and acted upon by a spring 272 so as to urge the roll upwardly within limits set by a screw 277 ; during operation, the roll is depressed against the spring through distances depending upon the thickness of the sole being roughened. The drive for the roll is from the shaft 210 through gears 212, 216, vertical shaft 270, and bevel gears 268, 266 ; the bevel gear 266 is on the shaft 262 which carries a gear 296 acting through idlers 298, 300 on a gear 302 on the roll shaft. The roll may be adjusted to and from the edge guide 66 by moving the carrier 260 along the shaft 262 by a screw-threaded rod 286. The toothed wheel 62 co-operating with the roll 60 is mounted on a shaft 242 in a yoke 244 which is adjustable about the axis of the shaft 210 so as to vary the position of the wheel and thereby the amount of cross-feed force applied to the sole. The toothed wheel is driven from the shaft 210 through gearing 212, 222, vertical shaft 250, and bevel gears 248, 246. To operate the machine, a treadle is first depressed so as to act through a rod 278, Fig. 7, and linkage to lower the sleeves 56, 58 from the tool and the feed roll 60 from the toothed wheel 62 whereby a sole 32 supported on the table 52 may be moved into engagement with the edge gauges 64, 66. Upon release of the treadle, the sole is gripped between the feed roll 60 and toothed wheel 62, forced against the tool 38 by the sleeves 56, 58 and then moved lengthwise of its margin. The sleeves 56, 58 rotate in opposite directions to the tool 38 and have a, surface speed considerably greater than that imparted to the sole by the feed roll and wheel. The machine described above is arranged to roughen a band around the whole, or substantially the whole, periphery of a sole, such margin being of either uniform thickness throughout or bevelled in the shank portion ; the sleeves move vertically to position their upper edges suitably in both cases. By modifying the disposition of the teeth on the tool 38, and, where necessary, lowering the height of the edge gauge 64, the roughened margin may stop short of the edge of the sole which may be simultaneously bevelled or rebated, Figs. 18 to 24 (not shown). The tool 38 and the other operating parts may be driven by the same motor or different motors.