GB331402A - Improvements in throw-off mechanism for platen presses - Google Patents

Abstract

331,402. Frauenberger, C. F. July 13, 1929. Impression adjustments; tripping- arrangements. - A platen presser for creasing, cutting, and like operations is constructed with a rocking platen 3 moved towards a fixed forme member 2 by connecting rods 4, the platen being carried on a shaft 5 journaled in eccentric sleeves 6 mounted in the ends of the connecting rods. To adjust the pressure of impression, the sleeves 6 are formed with projections 7 connected by an adjuster arm 8, and a spring-pressed catch 21 at each end of the arm 8 is engaged by a notch 15 in an adjustable pawl 13 to adjust the sleeves 6 to the desired position. The pawls 13 can be secured to racks 12 by screws engaging nuts movable in undercut grooves in the platen, and the impression pressure is dependent upon the position of the pawls 13. When it is desired to trip the impression, the catches 21 are disengaged from the pawls 13 by means of a trip-lever 50 which can be set by an electromagnet 87 to engage a trip arm 43 connected bv a link 41 to a lever arm 30 on a shaft 26 which is fitted with latch-lifting fingers - engaging pins on the catches 21. The projections 7 are thus released and the eccentrics move to throw-off the impression, the members associated with the shaft 26 moving at the same time from the dotted line position, Fig. 1, to the full line position. To untrip the press, the trip shaft 26 is moved anticlockwise, by the action of a cam 63 on a pivoted abutment 62 operated by a foot, bar 64 against the pressure of a centring spring 65. The cam 63 acts on a roller 36 on a lever 34 connected bv a link 32 to the arm 30 on the shaft 26, and also the cam 63 acts on a roller 38 in a bearing member 27 carried by the adjuster bar 8. and restores the bar 8 to its normal position. The members 50, 63 are adapted to effect their operations independently of the position to which the pawls 13 are set, so that the tripping actions are independent of the impression adjustments. The electromagnet 87 is arranged in an electric circuit similar to that described in Specification 308,525 which describes a. machine with a pressure-adjustment device similar to that of the present application. This circuit includes a stopping device controlled by the delivery grippers of the press.