GB1073806A - Improvements in or relating to sheet feeding apparatus - Google Patents

Abstract

1,073,806. Feeding sheets. DRUCKMASCHINENWERKE LEIPZIG VEB. Nov. 10, 1965, No. 47672/65. Heading B6B. A sheet separated from a pile by a suction device is conveyed to intermediate guides from which it passes to a sheet-finishing or other machine by a conveying sucker 12 carried by a bar 6, cam mechanism being provided whereby the suckers 12 can be moved lengthwise relatively to the bar 6 during the movements of the bar. The bar 6 is reciprocated lengthwise for conveying the sheet by means of a rod 3 pivoted thereto at 11<SP>11</SP> and fixed to an oscillating shaft 1. An oscillatory movement about the pivot 11<SP>11</SP> is given to the bar 6 from an oscillatory shaft 2 by a linkage 9, 10 connected to the bar at 11<SP>1</SP> so that the sucker 12 returns to its sheet receiving position along a different horizontal path to that it takes during a conveying movement. The bar 6 has a tubular extension 7 in which the sucker 12 can slide and through which suction is applied to the sucker. A spring 13 is situated between the sucker and the end of the bar 6. Pivoted to the sucker is a link 20 connected to a lever 18 pivoted at 19 to the rod 3. A roller 16 on the lever 18 engages a fixed but adjustable cam 14 having a circular part R with projecting parts 22, 23 at its ends. The angle subtended by the circular part is equal to the angle of oscillation of the shaft 1 so that if the cam is adjusted so that the roller 16 engages only that part, the sucker movement is the same as that of the bar 6. If, however, the cam 14 is adjusted angularly relatively to the shaft 1 by means of a rod 15 pivoted thereto, either the cam part 23 acting on the roller 16 causes the sucker 12 to move rearwardly relatively to the bar 6 at the end of a rearward movement of the bar or the cam part 22 causes a relative forward movement of the sucker at the end of a conveying movement. Two such suckers with their operating means may be mounted on the shafts 1, 2 and be independently adjustable along the shafts according to the size of sheet and also so that they may take sheets separated from one or the other of two adjacent piles of sheets.