Patent GB-915629-A (GB)
Title: Improvements relating to embossing machines
IPC: B41J3/38
Filed: 1959-11-30
Abstract: 915,629. Selective embossing. ADDRESSOGRAPH - MULTIGRAPH CORPORATION. Nov. 30, 1959 [Dec. 5, 1958], No. 40585/59. Class 100 (4). A machine for embossing devices such as printing-plates having a rotary die-head 22 and a carriage 27 movable on a frame support rail 23 to move the plate in two co-ordinate direction under the head has a work-holder mounted on an upper carriage 29 comprising a shaft journalled therein to which a first jaw is fixed and a second jaw freely mounted on the shaft, the arrangement being such that movement of a handle coupled to the shaft moves the jaws from an operating position to a loading position in which they are forced apart against the action of spring means biasing them together. Letter-spacing escapement mechanism.-The carriage is constantly urged along the rail 23 in a letter-spacing direction by a spring 38, Fig. 1, and its escapement is controlled by pawl 178, 179, Fig. 11, co-operating with one of four escapement racks 166-169, Fig. 12. The pawls 178, 179 are mounted on a lever 175 which is rocked by a rod 41 to effect a letter-spacing movement, the size of which is dependent upon which rack 166-169 is placed in engagement with the pawl. The racks 166-169 are rotatably mounted on a shaft 161 and are held with the selected rack co-operating with the pawls by a spring detent device. To give additional different spacing distances the racks are readily replaceable in their mounting. Line-spacing escapement mechanism. Line indicator.-An upper carriage member 29 is constantly urged towards the die-head along rods 100, 101, Fig. 1, by a spring 46, Fig. 6, and its escapement is controlled by a pawl device 122 co-operating with one of three racks 111- 113 rotatably mounted on a shaft 116 and held with the selected rack in contact with the pawl device by a spring detent. A lever 45 effects escapement release for line spaces by rocking the pawl device 122 through a lever 126. A resilient indicator member 106, mounted on a shaft 104 with the spring 46 for rotation therewith, shows on an index plate 109 the line positioned for embossing. Plates 109 are replaceable and are appropriate for the spacing of each rack 111-113 is provided. The racks 111-113 are also readily replaceable to give additional different line-spacing movement. Back spacing.-A back-spacing pawl 207, Fig. 11, positioned for engagement with the operative escapement rack 166-169 is operated by a key through a rod 192 actuating a linkage 196, 201, 206. Carriage release. Tabulating.-Carriage release is effected from a key through a rod 40 pivoting a lever 184, Fig. 11, to cause a camming member 183 to engage in extension 182 of the pawl lever 176 to withdraw the pawl 178 to allow the carriage to move freely under the force of the spring 38. Tabulating stops 243- 245, Fig. 13, can be accurately positioned between pairs of nuts 246-248 on a shaft 238 and actuation of a tab key first elevates the stop into effective position for engagement by a fixed stop 261 on the carriage 27 and secondly effects carriage release by a coupling to the rod 40. The shaft 238 is mounted between a nut 241 and a recess in a spring-loaded shaft 235 so as to be readily replaceable by another shaft having differently-positioned stops. Carriage stop.-A device 50, Figs. 1, 13, for stopping the carriage 27 in position at the start of a line has individual adjustable stops 215- 218 mounted on a shaft 212 and rotatable by a knob 214 to move the desired stop to the effective position. Work holder.-The workpiece 26 is held between jaws 31, 32 of a holder 30, Figs. 1, 12, mounted on a shaft 33 and operated by a handle 66. With the carriage 27 preferably at the right-hand end of the rail 23 and the carriage member 29 fully withdrawn from its embossing position, the handle 66 causes the shaft 33 to rotate the jaws 31, 32 to the position 31A, 32A, Fig. 12, where a stop 76 causes them to be forced apart and a spring 85 passes over a centre position to hold them in open position while another latching device holds the carriage member 29 against movement to its embossing position. Return of the handle 66 allows a spring to close the jaws 31, 32 and the carriage member 29 is unlatched while the spring 85 goes over the centre position again. At a plate-rolling station 52, Fig. 1, the carriage is automatically latched in position during rolling and is then released. U.S.A. Specification 1,831,103 is referred to.