Patent GB-403995-A (GB)
Title: Improvements in or relating to fastening-inserting machines
IPC: A43D69/00
Filed: 1932-06-06
Abstract: 403,995. Nailing. BRITISH UNITED SHOE MACHINERY CO., Ltd., Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; Paterson, New Jersey, U.S.A.) June 6, 1932, No. 15900. Addition to 324,682, [Class 89 (iii), Nailing &c.]. [Class 89 (iii).] Relates to fastenerinserting machines as claimed in the parent Specification, and consists in the provision of means for locking the work support in elevated position to resist the driving pressure, spring means for relieving the operator of the weight of the work support when treadling, and means operating to cause the driver throat to compress the work at the driving position during driving. The work support comprises a horn 14 pivoted at 16 to a member 18 mounted on a slide 20 adapted to move up and down in a casing 22. The latter is carried by a post 26 mounted to slide up and down in the column 28. The slide 20 is urged upwardly by springs 30 but normally is locked against movement relatively to the casing 22 by pawls 23 which co-operate with a rack on the slide. The pawls are released from the rack by a cam 34, which is actuated by a treadle rod 38 when a treadle is first depressed. When so released, the slide 20 is raised by the springs 30 to carry the work, such as the shoe 15, up to an abutment plate 10 on the machine head. The cam 34 is then disengaged from the treadle rod, so that the pawls reengage and lock the slide 20. Depression of the treadle also acts to swing the horn 14 in to operative position. To this end, a block 46 linked by springs 44 to the horn is rocked by a rod 54 having a collar 56 adapted to be engaged by a projection 58 fixed to the rod 38. The horn thus carries the work up to a gauge 12. The lower end of the slide 20 is fixed to a rod 60 which is slidingly mounted and is encircled by a spring 64. This spring takes up most of the weight of the work support. The lower end of the post 26 is connected to one end of a lever 72 which is pivoted at 74 to a bellcrank lever 76. This is pivoted on a fulcrum 78 which passes through an elongated slot in the lever 72. The lever 76 is connected by a toggle 82, 84 to a slide block 86 urged downwardly by a spring 90. The block 86 is adapted to be held against downward movement by pawls 102 and a rack 104, and the pivot of the toggle members is connected by a link 98 and lever 96 to a rod 94. A cam lever 110 mounted on the lever 76 is adapted to engage a roll 116 carried by the lever 72. A rack 120 secured to the lower end of the post 26 is adapted to be engaged by pawls 122 carried by a pin 124 mounted in a swinging arm 126. The pin 124 engages in a cam track 128 in a swinging arm 130. The arm 130 is connected by a lever 134 and link 132 to the toggle member 82. The arm 130 is urged downwardly by a spring 138 secured to a treadle rod 112. When the treadle is raised, projections 142 on the rod 112 engage and raise the arm 130, the cam slot 128 then disengaging the pawls 122 from the rack 120. In operation, the operator jacks a shoe and depresses the treadle. This acts first both to raise and to swing in the horn and, through the treadle rod 112 and cam lever 110, to raise the lever 72 and the post 26 to press the work against the abutment. Further raising of the lever 72 acts, through the straightened toggle 82, 84, to raise the block 86. The arm 130 is pulled downwardly by the treadle rod 112, causing the pawls 122 to engage the rack 120 and lock the work support against the pressure of fastener-driving. During the operation of the machine, a cam, acting through the rod 94, breaks the toggle and allows the pawls 102 to lock the block 86 against the pressure of the spring 90. Breaking of the toggle acts to release the pawls 122 from the post 26 and then to lower the post, so that the work is lowered from the abutment 10 for feeding purposes. The mechanisms for actuating the awl 118 and driver 318, Fig. 6, and for imparting to the fastener stock a feed which is controlled automatically by the extent of the penetrating stroke of the awl, are similar to those described in the parent Specification. The driver throat 180 is carried by a horizontal bar 182 which, as described in the parent Specification, is reciprocated for cutting-off a fastener and carrying it into the path of the driver. The rear end of the bar 182 is pivoted, and its front end is connected by a ball joint to a rod 268 the upper end of which is ball-jointed to a lever 260 having a roll 264 engaging in a cam track 266. A spring 270 is arranged, with adjustable tension, between the lever 260 and collars 272 on the rod 268. In the operation of the machine, the throat 180 carries a fastener into line with the driver 318, and is then forced down against the work by the cam 266 acting through the rod 268. Thus, the throat compresses the work at the driving point and supports the fastener against deformation during driving. Specifications 9694/09, 12262 /10, 130,616, 188,765, and 278,404, [all in Class 89 (iii), Nailing &c.], are referred to.