Patent GB-1055142-A (GB)
Title: Improvements in or relating to duplicating and like printing machines
Inventor: BROWN ROLAND
IPC: B41L11/00
Filed: 1962-04-27
Abstract: 1,055,142. Duplicating or like printing machines. BLOCK & ANDERSON Ltd. July 29 1963 [April 27, 1962], No. 16199/62. Heading B6C. In a duplicating or like printing machine, wherein selected lines of a master image may be printed upon a copy sheet by projecting corresponding segments 11 on the printing drum 10 or the impression cylinder, a segment setting member 16 is provided which rotates with the drum 10 during an operative revolution, but can be rotated relatively to the drum at the end of a revolution to set different segments, the member 16 carrying a number of separate selements 17a . . . 17c each arranged to set one segment which elements can be selectively rendered operative by a manual control. As shown, the member 16 is employed in connection with the " operation " segments L which follow immediately the " heading " segments H. It is rotatably mounted on a sleeve 15 fixed to the drum 10 and is connected to the sleeve by a spring tending to move it anticlockwise to a position where the elements 17a ... 17c register with notches 13 in the projecting setting abutments 12 of the first three " operation " segments. Each element 17a ... 17c can be moved to set the segment aligned with it by the engagement of a corresponding pin 18a . . . 18c on the member 16 by a corresponding fixed abutment 48a ... 48c each of which is moved to pin-engaging position when an electromagnet 45<SP>1</SP> . . . 45<SP>3</SP> is energized. Thus, if with the member 16 in its initial position and abutments 48a, 48b, for example, set, an operative revolution of the drum takes place, the elements 17a, 17b will project the first two segments 11 just before they reach the printing bight and these segments will cause printing of the corresponding lines of the master on the sheet and feed of sheet. Selection of the abutments is effected by keys 40<SP>3</SP> . . . 40‹, actuation of which moves a lever 37 different amounts and through contacts 44<SP>1</SP> . . . 44<SP>3</SP> on the lever cause respectively three, two, one or none of the electromagnets 48a ... 48c to be energized. After a run with the machine set as described, the member 16 may be moved clockwise relatively to the drum 10 so that printing may be effected from the next one, two or three lines of the master following those just printed. For this purpose, the member 16 has attached to it three toothed discs 19, 20, 21. The discs 20, 21 are engaged by holding pawls 47, 22 respectively which, however, are rendered inoperative in the rest position of the drum. The disc 19, however, can be engaged by a movable pawl 27 to rotate the member 16 clockwise, such rotation being to the extent of one, two or three teeth determined by the setting of a mask plate 27 on a freely-rotatable arm 25 linked to the key-controlled lever 37. Thus, depression of one of the keys 40<SP>3</SP> ... 40‹ sets the mask-plate 26 so that a reciprocation of the pawl 27 would cause stepwise movement of the member 16 to the extent of three, two, one or no teeth respectively. The pawl 27 is actuated when a solenoid 34 is energized to couple a continuously-rotating shaft 33 to a shaft 31 by a one-revolution clutch 32, the shaft 31 carrying a cam 30 which operates the pawl 27. The solenoid 34 is energized only when a pedal other than the normal pedal or a switch on the normal pedal is operated, e.g. during the printing of the last sheet of a run. If, for example, the machine has been printing the first two " operation " lines as described above, i.e. key 40<SP>2</SP> is operative, and the second pedal is depressed, the member 16 will be moved back two lines at the end of the operative revolution. During the next revolution, the following one, two or three lines of the master will be printed according to which key 40<SP>1</SP>, 40<SP>2</SP>, 40<SP>3</SP> is now depressed. Setting of " Reading " segments H can be effected singly by means of a rod 69 projected when a solenoid 68 is energized, the solenoid being carried by an arm 67 geared to a setting knob 61. The knob 61 is movable axially so as to engage a pin 64 thereon in one of a series of holes 65 on a dial plate 66 indicating the segment selected. At the same time, a switch 70 is closed to energize the solenoid 68 and thus set the segment. As an alternative, separate keys corresponding to the several " heading " segments may be provided, each connected by a Bowden cable to a plunger element for setting the associated segment. Simultaneous setting of all the " heading " segments may be effected by a swinging or sliding member operated electrically or mechanically, or such a member may carry movable interposer elements, whereby the number of segments set simultaneously may be varied. Restoring the segments.-The ends of the segments 11 project from the left-hand end of the drum, Fig. 1, and the heading segments have cut-away parts 75. One of two rollers 73, 74, Fig. 3 (not shown), can be set to engage the segments during a drum revolution, the roller 74 being aligned with the cut-away parts 75. With the roller 73 in operative position, all the displaced segments are restored to inoperative position, but the roller 74 causes restoration of the " operation " segments only.