Patent GB-851122-A (GB)
Title: Improvements relating to embossing machines
IPC: B41J3/38
Filed: 1958-08-21
Abstract: 851,122. Selective embossing. ADDRESSOGRAPH-MULTIGRAPH CORPORATION. Aug. 21, 1958 [Sept. 4, 1957], No. 26907/58. Class 100(4) Type-wheel machines for embossing printing plates. A manually operable embossing machine comprises a rotary die head 54, Fig. 3 having a number of axially mounted dies and punches and a visual indicator 82 driven by a further drive consisting of a shaft 76 extending axially of the die head driven by gears 75, 67, Fig. 7, from a manually driven shaft 64 which also selectively rotates the die head 54. The shaft 64 has gears 66, 68 for rotating the die head 54 and is rotated through bevel gears 63, 62 from a hand wheel 35. Impression arrangements. Impression is effected by a hand-lever 34, rotating gearing, a cam mechanism 107, 108, and bell crank 109 (Fig. 9 not shown) operating a toggle mechanism 120-123 Fig. 3, to pivot, about axis 132, a support 128 carrying an anvil 140. Simultaneously a lower pressure member 220 is raised by a punch anvil 207 containing a compression spring 223. After impression punches 55A and dies 56A are returned by restoration members 142 and 230. Aligning for impression. The dies and punches are accurately aligned by an indexing wedge member 254, Fig. 3 which is moved into engagement with slots 70 on an indexing wheel 69. The member 254 is rocked by a shaft 246, Fig. 11, having a crank 244 resiliently and adjustably connected to a crank 241 operated from a cam on the shaft 103. When the member cannot enter a slot 70. further operation of the handle 34 is prevented by the end 247 engaging a stop 248 on the cam 106. Special holders. A metal or plastic plate 150 to be embossed, is held in a holder 36 having spring jaws 363, 364 which are mounted so that after the holder 36 is slid from position shown in, Fig. 3 to the dotted position, they may be rotated by a handle 362 about a shaft 361 for easy removal and the fitting of a further plate. Printing-point and printing-line indicators. An indicator 370, Fig. 3 and 20, is fixed to the machine base and extends between work carriage members 272, 273. The indicator overlies a card 372 fixed to the carriage member 272. Letter-spacing, carriage release and return arrangements. The special work holder 36 is mounted on the carriage member 273 for movement towards the dies and this is mounted on another carriage member 272 for transverse in letter-space movement. When the operating handle 34 is rotated a pair of pawls 284, 285 Fig. 16 is moved to dotted position and positively rotate a ratchet 283 half a letter-space: the other half letter-space is effected on return movement of the handle 34. The ratchet 283 is mounted on a shaft 279, Fig. 3, and drives two pinions 277, 278 which engage racks 275, 276 on the carriage 272. The shaft 279 contains a torsion spring 280 which tends to return the carriage to the right, Such movement being allowed when a key 41, Fig. 2, is depressed which rotates a cam 302, Fig. 16, to disengage spacing pawls 285, 284 and a backspacing pawl 286 from the ratchet 283. Back-spacing. Pawl 286 is actuated by a link 311 which is rotated about the shaft 279 by a link 309 operated from a key 42, Fig. 2. Line-spacing. Line-spacing is effected by movement of the carriage member 273 driven by racks 320 from pinions 322 on shaft 323 having a ratched mechanism positively rotated by a pawl against the force of a torsion spring which tends to urge the carriage away from the dies. Initial positioning in line-spacing direction is done by an indexing control lever 44, and line-spacing by control lever 45 which operates a pawl to advance the ratchet on shaft 323. Retraction of the carriage is made by a carriage release lever 46 which is pivoted to release the line-spacing and holding pawls away from ratchet so that the torsion spring moves the carriage member 273 away from the dies.