| 摘要 |
796,184. Feeding sheets. LABOMBARDE. P. D. Oct. 18, 1955 [Feb. 9, 1955], No. 29679/55. Class 100(1). [Also in Group XVII] Box blanks are fed from a blank separating and feeding station to, and through, a blanktreating station by an endless, continuously moving conveyer provided with alternate sets of fixed and pivoted lugs thereon, the pivoted lugs being controlled to swing upwardly to engage the rear edge of a blank to feed it to the treating station and then release it, and the next set of fixed lugs then engages the blank and feeds it through that station. Sheet-separators:- The blanks 20 are stacked in a magazine 184, and are each coated on both faces with wax or other material. The separator mechanism is substantially as described in Specification 795,621 and comprises a front adjustable gate member 186 co-operating with the magazine base normally to allow only one blank to pass. A carriage 203 (not shown), longitudinally slidable in fixed tracks below the magazine 184, supports a number of suction cups, such as 206, each having a flat friction rim for engaging the bottom blank 20. On the return stroke of the carriage, compressed air is supplied to the cups 206. The suction and compressed air supplies are controlled by a valve 211 operated by a cam on a drive shaft 222 which also operates the carriage. The reciprocating suction and friction cups feed the bottom blank between a pair of feed rollers 199, 200. Sheet-forwarders; pusher-feeds:-Each blank 20 is fed by the rollers 199, 200 on to a pair of endless chains 110, 111 (not shown), passing over sprockets 122, 124, the latter being driven continuously from a shaft 102 by chain and sprocket gearing. This shaft 102 also drives sprockets on the shaft 222 and the lower feed roller 200 by means of a chain 225. The shaft 102 is driven through reduction gearing 231 from a shaft 233 and pulley 234, or by a separate motor. Each conveyer chain has pivotallymounted lugs 134 thereon which are used solely to forward a blank 20 to a position between opposed electrically-heated members 51, 52, and has further fixed lugs 137 thereon for forwarding the blank, after treatment by the members 51, 52, to a delivery belt 116. The lugs 134, 137 are arranged alternately, and are spaced apart along the chains at a distance at least as great as the length of a blank. The pivoted lugs 134 are controlled by fixed cam tracks, such as 140, which are engaged by pins on the lugs to swing the lugs upwardly into operative position to feed a blank, and then to depress them to release the blank in position between the heating members 50, 51. The blanks 20 are supported on side rails, which also provide guard covers for the conveyer chains 110, 111, during conveyance by the chains, and are urged against these rails and the pusher lugs 134 or 137 by a series of spring fingers 151 adjustably mounted on supports above the chains. |
