Patent GB-294477-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41L19/00
Filed: 1928-07-17
Abstract: 294,477. Addressograph, Ltd., (Assignees of Duncan, J. S.). July 23, 1927, [Convention date]. Addressing-machines ; platen machines. -In printing-machines of the kind wherein printing-devices, such as address-plates, are fed in succession through the machine, an impression is printed on a sheet in one column from one part of a device, and the sheet is then moved in two directions at right angles so that an impression may be printed in another column from another part of the device. As shown, the leading edge of the sheet is held by grippers on a drum 50 made up of a series of spaced wheels, which drum is rotated intermittently, and is moved axially between successive impressions. Address-plates from a hopper are advanced by projections 86 on a chain 84 into printing position beneath a pair of platens 75, 76 mounted side-by-side in a casing 68, which is carried by pivoted arms 72, and is also suspended from pivoted arms 67 by means of vertical links 69. The casing 68 is reciprocated vertically from an oscillating shaft 8 connected by links 63 to arms 71 pivoted to the casing. The drum 50 is fixed on a shaft 42 reciprocated bv a cam-and-lever mechanism and rotated intermittently by a rocking pawl engaging alternately a small and a large tooth on a ratchet 45, the small tooth providing the angular movement of the drum required to advance the sheet between the separate impressions printed from one plate. and the large tooth advancing the sheet for the impressions from the next plate. Tripping-arrangements.-The plates 75, 76 are moved in turn into operative position to print from one or the other part of the printing-device bv means of a pair of cams 77<1> arranged above the platens, each cam being fixed on a shaft 77 on which is an arm 78, and both arms 78 being connected together by a link 79 provided with an extension 80 adapted to be engaged by a disc on the drum 50 at each reciprocation thereof to rotate the cams. The shaft 8 which reciprocates the platen casing is oscillated by links from an arm 14, which is loosely mounted on a shaft 10, and is rocked by a member 11 mounted on the same shaft and connected by a rod 12 to an arm fixed on a rotary shaft 5, the member 11 acting through an arm 22 pivoted on the arm 14. When printing is not required from any selected address-plate, a pivoted lever 20 is raised by the selecting-mechanism (not described) and, through a rod 21, turns a cam 19 loosely mounted on the shaft 10, and the cam 19 lowers the arm 22 and prevents rotation of the shaft 8 and therefore actuation of the platens. The shaft 8 may be raised or lowered to allow for different sizes of drums 50 by loosening fixing- screws 91 engaging threaded holes in a vertically slidable member 88 in which the shaft 8 is mounted and then turning a screw 92 to adjust a slide 87 acting on the member 88 by means of inclined surfaces 89. Gripper mechanism.-The front edge of the sheet is gripped against seats 58 on the drum wheels by pivoted fingers 55 adapted to be rocked against the action of springs 57 to release the sheet bv means of pins 54 fixed on a shaft 52 rotated by turning an external handle.