Patent GB-512979-A (GB)
Title: Improvements in or relating to the splitting of shoe soles
IPC: C14B1/22
Filed: 1938-02-15
Abstract: 512,979. Sawing. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Feb. 15, 1938, No. 4621. [Class 145 (ii)] [Also in Group VII] A crown or annular saw removes an intermediate layer of material from the heel part of the sole of a shoe, the sole being held between a rotary feed member and a rotary roll which is so shaped that the thickness of the two parts varies as required. One part may be secured to the top of a heel while the other part may be turned down to lie against the heel breast. The cycle of operation is effected during one revolution of a shaft carrying several operating cams and includes the positioning of the sole, the gripping movement of the feed member, the feeding movement, the retraction of the sole and the lifting of the feed member, where the cut sole can be removed and another inserted. The sole 32, Figs. 6 and 14, is supported by a table 52 and is positioned by (1) spring-controlled side gauges 56 geared together so as to move oppositely, (2) one of the adjustable side gauges 58, also geared together so as to move oppositely, according to whether the sole is right or left handed, and (3) an end gauge 54, shown also in Fig. 4, which is withdrawn by a connection to one of the operating cams. The sole is then gripped between roll 38 and feed member 46 which are rotated slowly to feed the edge of the sole against the teeth of the annular saw 44 by which a layer of material is removed. Towards the end of this forward movement a hole is punched in the sole by the rotating punch 50 carried by the feed member 46, the motion of the rotary members being then reversed and the sole withdrawn. The roll 38, shown also in Fig. 16, is of barrel shape generally, to agree with the curvature of the saw, but is provided with three cylindrical parts 152 of different shape. The roll may be adjusted through 120 degrees to bring the disused part 152 into the operative position whereby a convex part 157 may be cut on part of the sole and a concave part on the other as shown in Fig. 18. Spring fingers 40 press the sole into close contact with the roll 38. The feed member 46 is mounted on an arm 60 pivoted to the frame of the machine at 62 and carrying also a spring pressed spur 388, both the feed member and spur engaging the sole when the arm 60 is moved about its pivot by cam gearing acting through a yieldable connection through link 420. The punch 50 is rotated when the feed member 46 rotates, by engagement of toothed pinion 458 with a sector 460 carried by the arm. Fig. 2 shows a general view of the machine with the driving mechanism for the second operation previously described. The electric motor 112 drives the shaft 70 of the saw continuously through bell gearing 110, 134. A saw sharpener 114 is also driven from pulley 130 on shaft 70 through belts 128, 124 passing over jockey pulleys which are raised or lowered to connect or disconnect the sharpener 114. The sharpener is mounted in a bracket 118 mounted on the slightly inclined shaft 120. When the sharpener is in use, the roll 38 and table 52 are moved clear by turning their supporting bracket 136 about its pivot 138. An extension 144 of bracket 136 then prevents' tripping of the clutch lock 68 so that cam operating shaft 98 cannot be rotated. Shaft 98 carrying operating cams is rotated through worm reduction gear 104, 102 and a clutch having a tripping stop 68 which permits one revolution only if the pedal 66 is released after it has been depressed. If the pedal is kept down; the shaft 98 rotates continuously, one rotation of the shaft giving a complete cycle of operations. One cam acting through angle lever 428 reciprocates the link 420 which raises and lowers the feed member. Another imparts the necessary limited rotation to the feed member and the roll 38 through mechanisms by which the amplitude of the movement may be adjusted. A further cam moves the saw 44 and its shaft 70 axially through angle lever 90, link 88, and lever 84. A connection 484 to lever 84 also brings the end positioning gauge 54 into and out of operation as required. A telescopic shaft forming part of the driving connection between the feed member 46 and the roll 38 allows necessary relative movement.