GB666969A - Printing press - Google Patents

Abstract

666,969. Printing-machines. CHANDLER & PRICE CO. April 6, 1948 [April 23, 1947], No. 9589/48. Class 100 (ii). In a platen printing-machine of the kind in which a curved platen 8 is used, the type forme 18 is so mounted on the oscillating frame 3 that it is capable of limited oscillatory and translatory movement with respect thereto in order to effect accurate register between the platen and type forme during printing. The oscillating frame 3 is operated by a crank-pin 22 and links 20, and the platen 8 is mounted in a fixed frame and is moved to the position shown in Fig. 1 to receive the sheets, the bed 17 which carries the forme 18 being mounted in its frame 28 by means of ears 26 which are slotted to receive rollers 29 on the sides 28 of the frame and so permit longitudinal movement of the bed relatively to its frame, and slotted ears 30 at each side of the bed engage rollers 32 on side members of the frame and so permit of angular movement against the action of springs 35 which normally maintain the bed 17 in such position that the right hand ends of the slots 31 engage the rollers as shown in Fig. 1. When the parts are moved to the position shown in Fig. 2 the printing operation is about to begin and the crank 22 is approaching dead-centre. To secure a true rolling motion between the forme 18 and the platen, the bed is controlled in its movements by means of levers 40, which are carried by the frame 3 and oscillated by a cam 47 on the shaft 10 of the driving gear 9 through a lever 41. Rollers 44 on the levers 40 engage the sloping sides 34 of the lugs and the bed 17 is thus given a counterclockwise movement about the rollers 29 and can also move vertically relatively to the rollers. The printing operation tends to move the bed in a contrary direction and this is controlled by the pressure of the rollers 44 against the cam sides 34. The direction and amount of movement of the bed 17 is controlled by the floating mountings consisting of the pin-and-slot connections 27, 29, 31, 32, which are arranged so as to maintain true registry in all positions. Specifications 14805/05, [Class 100], 174,445, [Class 100 (ii)], and 639,664 are referred to.