Patent GB-316187-A (GB)
Title: Improvements in or relating to machines for driving fasteners in the attaching of heels
IPC: F02K9/90
Filed: 1929-07-23
Abstract: 316,187. United Shoe Machinery Corporation, (Assignees of MacKenzie, F. L.). July 24, 1928, [Convention date]. Loose-nailing. - Relates to machines having power-operated means tor delivering gangs of fasteners to inside heel-attaching driving position, for example machines of the general type described in' Specification 186,126, [Class 17 (i), Boots and shoes, Apparatus for making &c.], and consists in improved hand and automatic controlling means for the nail separating and transferring mechanisms, particularly to guard against inadvertent double-loading of the jack with fasteners. As shown, the machine comprises a main shaft 16 with clutch 18 controlled by a treadle 20, a jack 12, and a heel abutment 22. A nail loader block 34 is movable between nail-receiving position below a foot plate 32 and nail-delivering position above the jack 12 by means of a racked bar 38 reciprocated by a gear 40 on a shaft 42. The foot plate is supplied with nails from a pair of hoppers 24 by means of separating devices A and tubes 30, and is carried by a pivoted lever so that it can be swung aside. A friction device 44 connects the gear 4U and shaft 32 to permit slip between them. Rotated by, and slidable on, the shaft 42 is a clutch member 46 adapted to co-operate with clutch members 48, 50 driven in opposite directions by bevel gearing 54 and connections 52 to the main shaft. According as the member 46 is clutched, by means of a rod 56 passing through the shaft 42, to the member 48 or 50, the loader block is carried to its loading or delivery position, the friction device 44 slipping when these positons are reached. The rod 56 is operated by a lever 60 which is normally so held by a spring 64 that the members 46 and 48 tend to engage. When the lever 60 is moved, to cause the loader block to move forwardly by engaging the members 46 and 50, it is locked in this position by means of a cam disc 68 until the shaft 42 has completed one revolution, after which the lever is allowed to return. The cam periphery of the disc 68 operates the separating mechanisms through a spring-held rod 76, bellcrank levers 80, and slotted links 82. To avoid undue wear of the friction device 44, the clutch member 46 is moved to a central, disengaged position after the member 48 has returned the loader block to loading position. To this end, the lever 60 carries a roll 112 adapted to engage a cam disc 106 on a shaft 86 driven from the shaft 42 by gears 88, 90. After the lever 60 has moved inwardly to return the loader block to delivery position, the disc 106 acts, under control of a spring 98, to move it back sufficiently to disengage the clutch members 46, 48. Each separator, Fig. 3, comprises an end block 114 formed with recesses 116 aligned with the raceway slots 26 and leading to the tubes 30. Guided at the lower end of the raceways is a carrier slide 118 on which is adjustably mounted a plate 132 formed with nail-separating slots 136 which terminate in enlargements 138. Each separating slot is carried, in the movements of the plate 132, into three positions. In the position indicated at a, the slot is ready to receive a nail; at b, a nail is held in the slot; and at c, the nail is delivered to the recess 116. The slide 118 is moved to its extreme position corresponding to position a by the cam 68 and slotted link 82, and is returned to a position corresponding to position c by a spring plunger 146. During this return movement, however, the slide is locked for a time at position b by a latch 152, Fig. 1, which is only released, by means of a rod 158 pivoted to the treadle 20, when the latter is operated to produce nail-driving. The rod 158 can be moved outwardly, by means of a rod 160, so that it does not disengage the latch 152. No nails will then be separated, although the machine can still be operated, for example if it is desired to use different nails, which would be hand-loaded. In operation, the lever 60 is moved outwardly so that the loader block moves over, and delivers its nails to, the jack. At the same time the separator is moved to pick off a group of nails. The loader block is then returned to loading position. The shoe is then jacked and the treadle 20 depressed. This causes clamping of the heel and driving of the heel nails, and also tripping of the latch 152, so that a new batch of nails is delivered to the loader block. Specification 286,780 is referred to.