Patent GB-168952-A (GB)
Title: Improvements in or relating to cutting-machines
IPC: C14B5/00
Filed: 1920-05-12
Abstract: 168,952. Freer, H. H. May 12, 1920. Cutting-out apparatus.- A mechanically actuated cutting-out press for dealing with one or more layers of material, such as leather, comprises a press-knife support adapted to move rectilinearly over a supporting bed in guides provided with a number of hand-set devices determining the position at which the cutting stroke is to be made. Contact with the selected device serves to stop the longitudinal movement of the press and close a one-revolution clutch which performs the cutting operation, the knife press being thereafter returned to its original position. The press-knife support 10 is carried by four pillars 9 bearing rollers 8 moving in slotted guides 7 which are carried by cross members 6 supported by central vertically reciprocating members 5 moving between the standards 2 of the cutting bed 1. Vertical adjustment of the knife press is effected by means, of threaded sleeves 12 engaging screwed tops of the pillars 9, rotation of the sleeves being effected by a hand-wheel 19 through a. sprocket wheel 17 thereon and a chain 16 engaging similar wheels 13 on the sleeves. Longitudinal movement is imparted to the knife press by driving-bands 66 connected to the pillars 9 and passing over drums 65 carried at either end of a transverse shaft 34. Rotation in opposite directions of the shaft 34 is effected from a driving- shaft 44 through open and crossed belts 42, 43 passing over pulleys 40, 41 bearing clutch parts 36, 37 adapted to be engaged by a clutch 38. Mounted in pairs of brackets 20 on the bed 1 is a shaft 21 bearing hand-set devices 22, Figs. 3 and 4, provided with projections 24 and two ratchet teeth 26 engaged by awls 27 pivoted to the righthand brackets 2.0. The members 22 are connected by pin-and-slot connections to the shaft 21, adjustment of any selected members being thus allowed. Rotation of the shaft 21 on the upward movement of a setting member from the position shown in Figs. 3 and 4 rocks, through crank and link connections, a rod 50 to close the clutch members 38, 36 and cause the knife press to move over the table until a pin 29 on one of the pillars 9 strikes the upturned part 24 and moves it and the shaft 21 longitudinally against a spring 67. Such movement removes the ratchet teeth 26 from engagement with the pawl 27, thus allowing the shaft 21 and the part 22 to return to their original positions under the influence of the spring 67. The clutch 36, 38 is thereby opened and a lever 30 rocked to close a one-revolution clutch 33 and cause the members 5 and the pressknife support, through the frame 7, to be reciprocated bv cams 4 on a shaft 3. Return movement of the press-knife support is effected by a cam 59, which near the end of a revolution of the shaft 3 rocks a shaft 55 and this, through a link 53 and a bell-crank lever 52 closes the clutch 37, 39. At the end of the longitudinal return movement of the press-knife support 10. the clutch part 38 is returned to its central position by contact of the part 10 with a lever 62 which rocks through a link 61 the bell-crank lever 52 connected to the clutch.