Patent GB-382352-A (GB)
Title: Improvements in or relating to stencil duplicators
IPC: B65H3/30
Filed: 1931-08-24
Abstract: 382,352. Printing-machines. FERRAR, B., 240, Broadway, New York, U.S.A. Aug. 24, 1931, No. 23771. Convention date, Aug. 26, 1930. [Classes 100 (i) and 100 (ii).] Set-off, preventing ; sheet - separators.-In a slip-sheet device for use with a stencil duplicating-machine, comprising a sheet-supporting means adapted to support a plurality of stacked slip-sheets while effecting release of the lowermost sheet, a movable member is adapted to engage an edge of the lowermost slip-sheet and move that edge towards the opposite edge of the sheet, whereby the sheet is buckled and the energy stored therein utilized to help to release the sheet from the member and impel it downwardly and out of contact with the remaining 'sheets. The stencil duplicator shown in Figs. 1 and 4 is of the usual type having side frame members 11 supporting a cylinder 12 beneath which the successive sheets of paper to be printed upon are fed from a table 13, and ejected one by one into a tray 16. The tray is attached to the duplicator by means of an arm 20, secured to the bottom 17 and a tie-rod of the duplicator, and a pair of locking-arms 25 pivoted to the side walls 19 of the tray and engaged with the side frame members 11 of the duplicator. A pair of slip-sheet feeding or ejector shafts 30 are supported in the tray 16 and extend longitudinally of the tray. The shafts 30 normally support the slip-sheets 28 and deposit a sheet in the tray 16 each time a printed sheet is delivered from the duplicator. Each shaft has a longitudinal groove 31 somewhat longer than the length of the slip sheets, the walls 32, 33 of these grooves serving respectively as ledges for receiving the slip-sheets about to be ejected, and as abutments for ejecting the sheets from the stack. The abutment wall 33 is radially cut in the shaft and has a depth substantially equal to the thickness of the slip-sheets, and the ledge wall 32 is perpendicular to the wall 33. Secured to the outer ends of the shafts 30 are a pair of grooved pulleys 34, 35. About the shafts 30 and anchored to the pulleys and an adjacent bearing- plate 26 of the tray are a pair of coil springs 341, 35<1>. Extending from the pulley 34 to the pulley 35 is a flexible cable 53, and also extending from the pulley 34 is a flexible cable 50 which passes over a guide roller 51, journalled in a bracket 51<1> secured to the tray 16, and is secured to a link 48. The link 48 is connected to a crank arm 45 secured to a shaft 46 which is rotated through a train of gears operatively connected with the cylinder 12. The ends of the cables are inserted in drilled holes in bosses provided on the pulleys and secured by setscrews. The cables are arranged on the pulleys so that the shafts 30 are rotated in the direction' of the arrows shown in Fig. 4. As the drum 12 is rotated the crank arm 45 is rotated in timed relation to cause slip-sheets 28 to be buckled and forcibly impelled downwardly on to the printed sheets by the shafts 30. During the return of the crank 45 from its extreme outward position the coil springs 34<1>, 35<1> act on the shafts 30 to return them to their normal positions. Arranged transversely at the upper portion of the tray 16 are a pair of bearing- .plates 26 secured at opposite ends to the side walls 19 of the tray, and the ends of the plates are bent to provide a plurality of upwardly projecting guide fingers 27 which extend longitudinally of the tray directly above the shafts 30 and are adapted to receive therebetween the stack of slip-sheets 28. A wire abutment 56 is provided at the outer end of the tray 16 to check the movement of the printed sheets as they are ejected from the duplicator. The abutment 56 is substantially of inverted V-form and the ends of the length of wire are bent to provide upwardly projecting arms 57, 58 pivoted in the side walls 19 of the tray. The arm 58 passes through the wall 19 and is bent downwardly at 59 and attached to a tension spring 60 secured to the wall 19. The spring holds the abutment upright but allows it to be moved rearwardly when it is desired to remove the sheets from the tray. A notch 18 is provided in the bottom 17 of the tray to facilitate removal of the sheets.