Patent GB-1155253-A (GB)
Title: Automatic Turning Machine.
Inventor: FREEMAN LOUIS GEORGE JR
IPC: C14B11/00
Filed: 1967-05-05
Abstract: 1,155,253. Folding edges of non-metallic sheet material. L. G. FREEMAN. 5 May, 1967 [5 May, 1966], No. 21035/67. Heading B5K. A machine for folding the edges of a leather workpiece, e.g. a wallet, comprises an upper platen 8 vertically movable towards and away from a lower platen 1; a die assembly mounted on the platen 1 and including a horizontal plate 34 slidable in channels 35, 36 relative to the platen 1 from a forward to a rearward position of use; a coacting die assembly mounted on the platen 8; guide rails 17, 18 projecting rearwardly from the platen 1; an actuating bar 23 movable along the rails 17, 18; means, comprising a handle 37 with a pin 39 engaged with the bar 23, operatively connecting the plate 34 to the bar 23 for movement therewith; pneumatic cylinders 27, 28 connected to the bar 23 for moving it from a forward to a rearward position; a pneumatic cylinder 6 connected to the platen 8 for moving it from an elevated inoperative position to a lowermost operative position in which the die assemblies are in contact; and actuating means 64 operative to sequentially actuate the cylinders 27, 28, 8 so as to bring the upper die assembly into contact with the lower die assembly when the plate 34 is in its alternate positions of use. Springs 11, 12 normally bias the platen 8 to its uppermost position and die elements 13, 15 are secured to the platens 8, 1, respectively. The element 13 comprises a male die 81 on a plate 80 and the element 15 comprises a die block 38 urged away from a base plate 82 by springs 84. The means 64 comprises a motor 65 which drives timing cams 66, 67, 68 which control solenoid actuated valves 54, 58, 60 which operate the cylinders 6, 27, 28. In operation, with the plate 34 in its forward position, Fig. 4 (not shown), the operator places a workpiece 87, Fig. 6, in a recess 85 in the plate 34 so that the marginal edges are supported by a shoulder 86. The cylinders 27, 28 move the plate 34 rearwardly to the position of Figs. 5 and 6 in which the workpiece 87 is vertically aligned with the die 81 and a female die cavity 89 in the block 38, the cavity 89 being normally closed by a block 90 on a plate 91 urged upwardly by springs 92. The cylinder 6 moves the platen 8 downwards and thus the die 81 moves downwardly through the cavity 89 so that the block 90 is lowered and the marginal edges of the workpiece 87 are turned upwardly about the sides of the die 81, Fig. 7 (not shown). As the plate 91 is moved downwardly it contacts spring biased locking elements 93 which, when the plate 91 seats against the plate 82, spring inwardly to lock the plate 91 and the block 90 in the retracted position. The die 81 is raised and the edges of the recess 85 which are offset inwardly of the cavity 89 prevent the workpiece from being pulled upwardly by the die 81. The plate 34 is returned to its forward position so that another workpiece can be placed thereon and a configured cavity 94 formed in the undersurface of the plate 34 is vertically aligned with the cavity 89, Fig. 8 (not shown). The die 81 then moves the plate 34 and the block 38 downwardly against the action of the springs 84. The workpiece 87 is pushed upwardly into the cavity 94 the rounded edges of which fold the upwardly projecting edges of the workpiece 87 inwardly and a pre-applied adhesive on these edges adheres to the workpiece, Fig. 9 (not shown). As the block 38 moves downwardly it cams the elements 93 outwardly to release the plate 91. When the plate 34 is moved rearwardly again, the folded workpiece 87 is carried rearwardly in the cavity 94 and is ejected by a blast of air through a hood 97. An electrical circuit for the operation of the machine is described, Fig. 12 (not shown).