Improvements in or relating to mechanism for feeding paper or the like to machines for making bags or packets

摘要

342,061. Feeding webs. DAY & SONS, Ltd., J., Beeston Royds Works, and NAYLOR, W. H., 27, The Drive, Adel, both in Leeds. Dec. 3, 1929, Nos. 37063/29 and 20004/30. [Class 100 (i).] In a machine for making bags &c. two oppositely arranged cranks or cams are mounted on a shaft driven at half the speed of the main shaft and are arranged to transmit motion alternately to one and to the other of duplicate sets of mechanism for actuating paper &c. feed rollers, one of the cranks &c. actuating the feed rollers during one revolution of the main shaft and the other during the next revolution thereof. At each end of the shaft 12 of a feed roller 13, a ratchet wheel 14 is adapted to be rotated by a pawl 28 secured to a ratchet arm 27 looselv mounted on the shaft 12. A connecting-rod 26 links the ratchet arm 27 to a slotted link 33 pivoted at one end 34 to the frame of the machine, and a block 38 oscillates in the slot 36 of the link 33 as a crank 37, to which the block is adjustably secured, rotates with a shaft 24. The shaft 24 carries at its other end an oppositely disposed crank adapted to actuate the other ratchet mechanism and rotates at half the speed of the main shaft of the machine, one revolution thereof corresponding to one crank actuation. The momentary pauses in the rotation of the feed roller, due to the passage of the cranks past the dead-centre positions, allow time for a knife 23 to sever the web into blanks. The link 33 may be omitted and the connecting-rod 26 be pivoted to the crank 37. In a modification, the connecting- rod 26, Fig. 5, is pivoted to a rocking lever 41 actuated by a cam 40 having a portion 40a concentric with the shaft 24 to give the pauses in the feeding.