GB514966A - Method and/or means for producing associated products in printing machines - Google Patents

Abstract

514,966. Automatic electric control systems, HOE & CO., Ltd., R. (Hoe & Co., Inc., R.). May 19, 1938, No. 14984. [Class 38 (iv)] [Also in Group XVI] The association of a preprinted and a freshly printed web travelling at similar speeds is effected by registering the webs at a point adjacent the point of association and immediately severing the registered sheets and forwarding them into association with the freshly printed web. The preprinted web 26 is fed by a roller 31 co-operating with rollers 32, 33 to cutting-cylinders 102, 103, and sheets cut therefrom are forwarded by rollers 106, 107 co as to be associated with the webs 11 ... 14 prior to the webs passing over the folding former 24. The roller 31 is driven from the printing-machine through a differential gearing, the casing of which is rotated in either direction to correct the register of the web 26. For controlling the rotation of the casing, marks printed upon the web end separated by a distance equal to the' printing-cylinder circumference are adapted to affect a photoelectric cell. A cam 35 driven from the printing-machine is adapted to close a switch 34 once for each revolution of the printing-machine. When the cell 28 is affected by the mark it causes energization of a solenoid 42 which actuates a switch 64 causing an electric motor 61 to drive the casing in one direction. At the same time a switch 44 in the circuit of the switch 34 is opened. On the other hand the closing of the switch 34 causes energization of a solenoid 49 which actuates a switch 65 causing the motor 61 to rotate in the opposite direction and at the same time opening a switch 52 in the circuit of the cell 28. If the cell 28 and the switch 34 are affected simultaneously, i.e., when the web 26 is in correct register, closing of the switches 64, 65 cannot take place. In a modification, the casing is rotated by a pawl actuated by one or other of two solenoids, one of which is energized when the solenoid 42 is energized and the other of which is energized when the solenoid 49 is energized. In order to ensure stripping of the sheets from the cutting-cylinders, two pairs of cutting-cylinders may be employed. The first pair 116, 117 form partial cuts in alignment with guide bars 111 engaging grooves in and adapted to strip the sheets from a second pair of cutting-cylinders which complete the severance of the sheets.