GB540112A - Improvements in or relating to machines with co-operating rotary cylinders, rollers or like parts - Google Patents

Abstract

540,112. Printing-machines. TIMSONS, Ltd., and DICKINSON, C. H. April 9, 1940, No. 6371. [Class 100 (ii)] A tripping mechanism for controlling printing, inking, or embossing rollers is described for controlling one or more plate cylinders 2 co-operating with an impression cylinder 1 the cylinders 2 being mounted in eccentric bearings 3 or in sliding or pivoted bearings. The eccentric bearings are operated by toggles 26, 24b controlled by a rod 21 with a curved slot 22 engaging a roller 23 or an arm 24a on the shaft 25 of toggle 24b, and the rod 21 is reciprocated by lever- and-toggle mechanism 19a, 19b, 15, 14a, the lever 14a being one arm of a three armed lever 14 freely mounted on a shaft 8 which is oscillated by cam-and-lever mechanism from the shaft of the impression cylinder 1. The lever 14 is fitted with a double pawl 12a, 12b, which can engage steel fittings 5, 6 attached to the ends of a slot in a disc 4 fixed to the shaft 8, a spring 28 acting on a roller 29 on the pawl so as to maintain the member 12b of the pawl out of action and thereby permit the member 12a to move the lever 14 to the position shown in the Fig. in which the printing- rollers are untripped. On operating a curved lever 31 by a pedal it is made to act upon a roller carried by the pawl 12b and this is then engaged by the fitting 6 as the shaft 8 moves clockwise and the lever 14 is moved clockwise to break the toggles and trip the printing rollers. The pedal may be held by a catch so as to maintain the rollers tripped.