Patent GB-308525-A (GB)
Title: Throw off mechanisms for presses
IPC: B65H7/04
Filed: 1928-06-15
Abstract: 308,525. Frauenberger, C. F. June 15, 1928. Impression adjustments; tripping - arrangements.-A platen press for creasing, cutting, or printing paper 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 16 at each end of arm 8 is engaged by a notch 14 in an adjustable pawl 13 to adjust the eccentric sleeves 6 to the desired position. The pawls 13 can be secured by screws so as to engage one of a series of teeth 12 fixed to the platen body, and the impression pressure is dependent upon the particular tooth engaged. When it is desired to trip the impression the catches 16 are disengaged from the notches 14 by means of hooks on a shaft 21, and as the platen moves to impression position, the adjuster bar 8 and its associated parts move clockwise, and the consequent rotation of the eccentric sleeves 6 causes tripping of the platen. The shaft 21 is fitted with an adjustable arm 23 which is formed with a number of holes 25 in one of which a roller 26 is fitted in a position corresponding with the particular tooth 12 engaged by the pawl 13 so that the tripping mechanism is correlated to the pressure-regulating mechanism. The roller 26 engages a spring-mounted abutment 33 on a lever 30, and acts to throw-on the impression. The lever 30 also carries a hook 36 which when the lever 30 is moved to the right in Fig. 4, engages an arm 28 on shaft 21 and acts to throwoff the impression. The lever 30 can be operated by a foot bar 37 to move the parts 33, 36 into operative position, or the lever can be held by a spring in an intermediate neutral position. The tripping of the press may be controlled solely by the lever 30, but if desired the tripping may be controlled electrically by push-buttons 68, 63, 81, Fig. 6, and in this case the hook 36 is normally maintained in an in-operative position by the energization of a magnet 53, and, when its circuit is broken, a spring 52 moves the hook 36 into tripping position. The electric control of the driving-motor 50 and the magnet 53 is indicated diagrammatically in Fig. 6. The starting switch 63 when operated switches on current to motor 50, and also energizes a magnet 60 which operates a switch 64 to maintain the current when switch 63 is released. The release of switch 63 closes the circuit to magnet 53, and hook 36 is maintained inactive. On pressing in a switch 68 an auxiliary circuit comprising a battery 74 is brought into action, and this circuit includes delivery grippers 43 of the press. If a sheet is not taken by these grippers a magnet 78 is energized and this breaks the circuit to magnet 53 and the hook 36 is brought into action to stop the press. The auxiliary circuit is automatically broken by a cam-actuated switch 76 when the press is in its closed position. The auxiliary circuit may be closed by a switch 81 operated by hand.