Patent GB-732051-A (GB)
Title: An improved machine for turning or creasing the edges of sheet material
IPC: A41H33/00
Filed: 1952-02-23
Abstract: 732,051. Folding edges of sheet material. WALLWIN (TURNING MACHINES), Ltd., and FENBY, H. R. B. Feb. 11, 1953 [Feb. 23, 1952], No. 4803/52. Class 42 (1). In a machine for turning or creasing the edges of sheet material, male and female dies are arranged for relative movement for thrusting a cut piece of material against a plate to initially turn and hold one or more of the edge portions of the material between adjacent edges of the two dies, and the female die and plate are adapted for relative movement apart and against one another for spreading and trapping or pinching the initial turn of the material between the female die and the plate in order to crease the material. As shown, Fig. 2, a fixed female die member 12 having an edge blade 21 is adapted to fold the top edge of a pocket and movable female die members 5 with edge blades 20 to fold the side and bottom edges. Die members 5 are fixed to a frame 4 which is movable only to a limited degree on studs 7 projecting from a fixed frame 1 which carries die 12. Die members 5 are normally supported on hotplate 9 which is mounted for sliding motion along slides 11 under control of a handle 29 which can be moved upwards towards a stop 32, to impart a small downward movement to the hotplate, or downwards towards a stop 33 to impart a larger downward movement to the hotplate. Male die 14 is movable along slides 18 towards and away from the hotplate by means of a handle 22. In operation, a piece of material 60 is placed in the opening formed by the female die members, with the edges to be folded overlying edge blades 20, 21, handle 22 is depressed to lower male die 14 so as to press the material onto the hotplate 9, and handle 28 israised to lower the hotplate and die members 5 to the position shown in Fig. 3; the top edge 61 of the pocket is thereby folded up by blade 21. Handles 22, 28 are then released to allow the hotplate and male die 14 to rise; as the hotplate rises the fold of material is spread at' 62 under edge blade 21, and as die 14 rises clear the fold is trapped between blade 21 and hotplate 9, as shown in Fig. 4. Die 14 is now lowered again and handle 29 is depressed to lower hotplate 9 to a greater extent than previously, so that frame 4 carrying die members 5 engages the heads of studs 7 and die members 5 part from the hotplate to fold up the side and bottom edges of the pocket as shown in Fig. 5. The hotplate and male die are then raised again to cause a spreading at 64 of the fold which is then trapped between the hotplate and blades 20. Die 14 may be lowered for a third time to press all the turned edges against the hotplate. To discharge the finished pocket, handle 22 is raised to its fullest extent so that the end of a lever 24 abuts a stop 58 on frame 4 to prevent the latter from dropping; meanwhile the hotplate 9 is lowered so that the pocket can slide thereof to be discharged at 59. To ensure neat folding at the bottom corners of the pocket, additional corner-turning blades 50 are provided. Blades 50 are spring-loaded inwards and are retracted to permit passage of the male die 14 by means of rollers 54 carried by the blades and engaged by inclined surfaces 56 on members 57 carried by die 14. In an alternative embodiment, the hotplate is fixed, separate female die members similar to 12 and 5 have a lost-motion connection, and the male die and female die members are raised and lowered relative to the hotplate by cam-operated mechanism so as to effect automatically a twostage edge-turning operation similar to that of the manually-operated embodiment. The female die may be formed in different ways by component die members or may consist of a single plate or like member.