Patent GB-779369-A (GB)
Title: Improvements in and relating to paper feed means for printing machines
Inventor: CLYDE LANCELOT HENRY ROBERT
IPC: B41K3/48
Filed: 1955-01-31
Abstract: 779,369. Printing-machines. ADDRESSOGRAPH-MULTIGRAPH, Ltd. Jan. 30, 1956 [Jan. 31, 1955], No. 2847/55. Class 100(2) Platen-machines. ' A sheet, card, &c. is attached to a feed slide mounted adjacent a drive slide in a guideway on the machine, and the drive slide is reciprocated during each printing cycle, a rack and pawl connection between the slides causing the feed slide to be advanced only during movement of the drive slide in one direction. The slides are parallel to but to one side of the sheet feed path. The machine may be used for invoicing, when it is desired to print three separate identical lists on one sheet. Exchangeable printing plates are attached to a flat member on the end of a printing head 4, Fig. 3, pivoted on a shaft 3 mounted on a base 1. An ink ribbon is disposed below the printing plate. On manually depressing the' head 4, printing takes place on to a paper or like sheet 16 resting against stops 42, 44 on a table 6, the sheet being pressed through a slot 9 in the table against two anvils 10, 11. The table 6 is guided on grooved rollers mounted in the base, and is'moved by means of a knob 39 into three successive positions wherein different parts of the slot 9 are above the anvils, so as 'to print on three parts of the sheet, the table then being returned to its right-hand position and the printing plate changed for the next similar operation. Lugs 43 limit the movement of the table, which is released for movement by a button 40. The sheet is held by a clamp 18, releasable by a lever 19 and carried on a feed slide 20, Figs. 3 and 4, guided in an inverted channel member 22 screwed to the table. In the member 22 beside the slide 20 is a drive slide 21 carrying a pivoted pawl 33 urged by a spring 35 into engagement with rack teeth 32 on the slide 20, so that the latter moves during movement of the slide 21 upwards in the figures, but not during downward movement, being located in each position by a detent mechanism comprising recesses in the slide and spring-loaded members on the table. The slide 20 can be released for independent movement by pressing a projection 36 to release the pawl. On moving the table to the left, pins 25 on a bar 24 centrally pivoted to the table engage a bar 23 on the base to swing the bar 24 counter-clockwise, whereupon one of two prongs 26 on the bar 24 engage a pin 31 on the slide 21 to move the latter downwards. On return movement of the table, the other prong 26 engages a second pin 27 on the slide 21 to move the latter upwards. The extent of movement of the slide is equal to the pitch of one or two rack teeth according to which of two positions the pin 31 is placed in. In another form, the drive slide has a fixed amplitude of movement, and an adjustably positioned member engages the projection 36 to disengage the pawl and limit the stroke of the feed slide. In another form, the drive slide is moved by a cam controlled by the displacement of the printing head. According to the Provisional Specification, the printing head may move the slide through a cable. To prevent operation of the feed after the last line of printing has been made, a removable cover may be placed over the feed slide to blank out the requisite rack teeth.