Patent GB-190614597-A (GB)
Title: Improvements relating to Printing Machines.
Inventor: BLAISDELL FREDERICK ELIJAH
Filed: 1906-06-26
Granted: 1907-06-26
Abstract: 14,597. Blaisdell, F. E. June 26. Delivery ayparatus; set off, preventing ; feeding sheets.-To prevent offeetting in delivery, the printed sheets are either passed by a shifting dropsheet delivery operated pneumatically or by tapes and grippers to pass the sheets on to several piles in rotation, or the sheets may be delivered by the same apparatus to a single pile, with slip sheets on top, fed from a pile by pneumatic devices to the drop-sheet delivery. The sheets are taken from the cylinder a, Fig. 1, and passed to a carrier running on guide-rollers, and .reciprocated from between the pivoted bars i, g, of a cantilever to above one of the tables j<1>, j<2>,j<3>, j<4>, the guide-bars h supporting the carrier in its outermost position being kept always horizontal. The outer end of the cantilever carrying the guide-bars h is intermittently moved by a cam k, levers m, n, rack n<1>, pinion o, chain-wheel o<2>, and chain g<2> to cause the sheets to be delivered in succession to the board j<1>, j<2>, j<4>, j<3>, j<1>, &c., the movement of the cantilever never being greater than twice the distance between consecutive pile supports. A sheet of celluloid &c. is placed between the bars g to act as a wind-guard, and prevent the sheets from being displaced through the motion of the cantilever. The carrier is moved to and fro by chains which are actuated from a sector c reciprocated by a crank. The pneumatic carrier comprises elastic sucker-strips carried in adjustable positions by cross-bars p<2> attached to a chain p<1>. The suckerstrips are formed with exhausting channels leading from transverse, telescopic exhausting tubes at the inner end to the outer end of the strip, where a short transverse passage connect the channel to a second parallel channel, from which sucker-boles with enlarged outer ends pass to below the strip. The transverse telescopic tubes connect through a swivelling and telescopic tube r<5>, r<6>, to the exhausting-apparatus, through a valve by which the suction is released when the carrier is in its outermost position. The front edge of the sheet may be simultaneously seized by fixed suckers s‹ with automatically-actuated valves, which. prevent the sheet from moving back with the carrier. A few suckerholes are provided in the upper and outer ends of the strips to hold the set-off sheets, if that method of delivery is used, and the bar n is disengaged, as shown in dotted lines, thus delivering all the sheets to the bottom pile. An automatic slip - sheet feeding-device, Fig. 11, is then provided, in which suckers v, attached to transverse tubes v<2> sliding on the bars v<6> pivoted at v<4>, are actuated by cams to lift the top sheet of a pile i, and deliver it to the carrier, the vacuum in the suckers being then broken by a cam-operated valve. To prevent more than one slip sheet from being taken from the pile by the suckers v, weighted detents or claws x<2> are slidably mounted in the front ledge of the pilesupporting tray, and hold down the edges of all but the first sheet. Instead of the pneumatic carrier, tapes 7 wound round a roller 11 mounted in the carrier are unwound as the carrier moves forward ; cam-actuated grippers 16, 17 seizing the front edge of the sheet and drawing it over the tapes. For the return movement, the grippers, after releasing the sheet, are depressed and the tapes roll from under the sheet, which drops on to the required pile. If this arrangement be used for slip-sheet delivery, the slip-sheets are fed by the suckers v to grippers 23 and carried on unwinding tapes to the grippers 40, by which they are held during the return movement of the carrier, and then dropped. The grippers are actuated by tappets and springs, and are adjustable in position for any width of sheet.