Patent GB-480431-A (GB)
Title: Improvements in or relating to timing mechanism for controlling the sequence of operation of automatic machinery
IPC: B31B1/74
Filed: 1936-05-20
Abstract: 480,431. Actuation of switches. GABBOTT, E. P., and PETERS, R. P. May 20, 1936, No. 33315/37. Divided out of 478,565, [Group XVII]. [Class 38 (v)] [Also in Groups XXIX and XXIV] Mechanism for timing the sequence of operation of automatic machinery by means of a series of devices such as electric contacts, triggers or hydraulic valves, comprises a striker 32a which is given a combined reciprocating and traversing movement whereby the devices are successively operated, the traversity movement being effected by a worm 26 and a lug or the like associated with the striker and movable into and out of engagement with the worm. The invention is shown applied to the machine for making cartons, barrels and the like described in Specification 478,565. The striker 32a is carried by a connecting rod 33 of adjustable length universally connected to an arm 33a rocked by a crank shaft 27 whereby the striker is given its reciprocating motion. The striker slides in a cross-head 31 pivoted on a fixed guide bar 30 and having a depending lug adapted to engage the worm 26 which is rotatably mounted on a driving shaft 20. A mandrel on which paper is wound, the worm 26 and the crank shaft 27 are driven at the same speed and in the same direction through chain gearing from a shaft 16. The latter is connected through a clutch 17 and chain gearing 18 to the shaft 20, which also drives continuously a hydraulic pump 24 connected to a reservoir 28 and a hydraulic pressure accumulator 29. The striker operates a series of sliding tappets 42 ... 46 of which all except 45 operate hydraulic valves comprising inlet and outlet valves 41a, 41b respectively, interconnected by a spring-biassed rocket 41c which normally maintains the outlet valve open. The tappets are all biassed forwardly by springs and the first two 42, 43 are operated simultaneously by fingers 47 on a shaft which carries a striker plate 48 stepped and radiused to correspond to the stroke of the striker. Catches 42a, 43a, 44a, 46a are provided to hold the respective tappets in retracted position and of these the catch 42a is released by an arm 44b on the tappet 44 which strips a trip arm 42b connected to the catch 42a. The catch 43a is released by a trip arm 43c engaged by an arm 45a on the tappet 45. A trip stud 43b on the catch 43a simultaneously releases the catch 44a. The last catch 46a is connected to an arm 46b and is released by a trip pawl connected to the arm 46b on the return of a table feeding paper to the mandrel. This last action starts the cycle by causing pressure fluid to be admitted to a ram 37a which lowers an arm 37, which through a fork 38 and a link 14b respectively causes engagement of the clutch 17 and releases a brake within a drum 14 connected to the mandrel. The mandrel, the worm 26, and the crank shaft 27 then start rotating. The descent of the arm 37 through interposed arms 35, 36 and a rocker bar 34 allows the lug on the cross-head to engage the worm 26, the starting point on which is determined by an adjustable stop 40 with a cushion spring. The first two tappets which may for instance start a gumming operation and apply pressure rollers to the paper are operated through the plate 48 before the first turn of the mandrel is completed. Subsequently the tappet 44 is struck directly and the paper is severed by a guillotine. The gumming operation is then stopped due to the release of the catch 42a. An idle period between the operation of the tappets 44, 45 enables the last turn of paper to be well rolled down. The operation of the tappet 45 releases the catches 43a, 44a. The operation of the tappet 46 disconnects the ram 37a from the fluid pressure supply and ends the cycle.