Patent GB-381216-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D87/00
Filed: 1931-07-02
Abstract: 381,216. Boot-making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Union Works, Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; 140, Federal Street, Boston, U.S.A.) July 2, 1931, No. 19063. [Class 17 (i).] Breasting; heels, machines for.-In a machine for compressing and breasting heels, a heel is fed by a slide from a remote point in two steps to compressing dies, which carry the heel to the range of a reciprocatory breasting knife, which breasts the heel while it is held by the compressing dies. The breast block of the dies is removed during the breasting stroke by toggles actuated by means movable with the knife. The compressing dies are closed by a toggle which is caused to move beyond its dead centre position, the breasting stroke occurring between these successive straightenings of the toggle links. The knife is guided by the front faces of the dies. The machine is of the kind described in Specification 22839/02, [Class 17, Boots &.c.], a frame 10 housing a crosshead 18 vertically reciprocated by toggle links 20, 22. An upper die 12 carrying a removable hardened follower plate 14 is detachably secured to the frame by a screw 15 and dowel pin 13, the removal of these members allowing the die to be slid forwards for removal. A block 32, for engaging the tread surface of the heel, is carried by a plunger 34 so that it may be raised for ejecting the work. The lower end of the plunger cooperates with an arm 40 pivoted to the head 18 and restrained by a friction device comprising a rod 50 engaged by a spring-pressed brake pad mounted in the frame, the rod being connected to the arm on the side of its pivot remote from a pin 46 co-operating with a latch 44 having a tail 45 co-operating with a fixed cam 47. These parts are so arranged that as, after compression and breasting, the crosshead 18 descends, the arm 40 is swung upwards to eject the heel and is latched in this position to allow a fresh heel to be received thereon during the upward stroke of the crosshead, the latch being tripped near the end of the upward movement of the crosshead. The movement of the rod 34 is limited by a screw 36 having a projection engaging a slot in the rod. To allow change of the block 32, the screw may be retracted by a rib on a plunger 35 urged to operative position by a spring but normally held in out of way position by a pin passing through its shank, which is bent for manipulation by the operator. The compressing dies comprise side frames 52 housing side dies 54, the frames being closed as the crosshead rises by links 84, each pivoted at one end to the respective side frame and at the other to the frame of the machine. A breast block is formed with T-shaped grooves engaged by corresponding projections on members slid laterally by toggle links, the grooves being inclined so that breaking the toggles retracts the breast block, while straightening them advances the block for the compression. Each toggle mechanism comprises a pair of links 72, 74, the common pivot of which is urged into the position of alignment by a spring 80 on a rod 78 provided with adjusting lock-nuts 85. The breasting knife 100 is carried by a slide 104 actuated by a cam-operated lever 110. The knife is kept up to its work by a spring-pressed rod 140. The slide 104 comprises parallel side members between which is a slide carrying a chip-ejecting plunger 132. As the knife descends, in contact with the front faces of the side dies, the plunger slide 134 is stopped by a spring plunger 144, a spring 138 being compressed. When the knife has completed its breasting cut, inclines on the slide 104 retract the plunger 144 and allow the spring 138 to extend, the chip being driven past the screw 36. The feed mechanism is similar to that described in Specification 11454/11, [Class 17 (i), Boots and shoes, Apparatus for making &c.], the heel carrying fingers 182 being, however, pivoted on horizontal axes so that they can swing upwardly as the heel slides along the upwardly inclined face of the block 32. The feed slide is also provided with a push bar 176 and spring guide strips 174, the arrangement being that a heel placed in front of the push bar 176 when this in its retracted position is, in the following rearward movement of the slide, fed between the curved ends of the strips 174, on the next rearward movement carried by fingers 182 to the compressing dies, and on the next rearward movement pushed off the block 32 to a discharge shoot. The lower face of the block 32 is downwardly inclined so that, under the compressing pressure, it may seat well back in the side dies and not foul the breasting knife when this makes its operating stroke. To cause the toggles 72, 74 to withdraw the breast block out of the way before the breasting knife reaches the heel, the knife slide 104 carries hardened blocks 108 which as the knife descends depress bars 152 guided at their lower ends by pin-and-slot connections and restrained at their upper ends by short links 154. These bars engage the nuts 85 as the head 18 rises and the slide 104 descends, and break the toggles, the upper ends of the bars being carried outwardly by the short links to allow the slide 104 to complete its descent. To return the toggles to straightened condition after a fresh heel has been inserted, fixed bars 164 engage arms 160 loosely engaging the rods 78 under the nuts 85 as the crosshead nears its lowermost position