Patent GB-464943-A (GB)
Title: Improved feed reversing device for use with fabric webs passing from one winding roller to another
IPC: D06B3/32
Filed: 1936-01-10
Abstract: 464,943. Winding and rewinding webs. POLLAK, J. E. (Etablissements Benninger Soc. Anon.) Jan. 10, 1936, No. 909. [Class 100 (i)] In a machine for the wet treatment of webs of fabric in which the web is wound alternately on each of two winding rollers, between which the web passes, each winding roller is provided with an adjustable feed-reversing control device which is driven by the associated winding roller and is adapted to reverse the drive when a certain predetermined amount of web remains upon the roller from which the web is unwinding. In one form, Figs. 1 and 3, the shaft 1 of each winding roller 2, 3 drives by means of a worm 4, a gear wheel 5 on a shaft 6 having a worm 9 in the form of a single helix engaging a wormwheel 10 fixed to a shaft 11. Slidably mounted on the shaft 11 and normally pressed by a spring into contact with the wheel 10 is a socket 12 carrying a spring-pressed stud 13 positioned opposite to one of the gaps between the teeth of the wheel 10. The socket 12 is operatively connected by a two-armed lever 14 to a cam 15 slidable upon and rotating with the shaft 1. The initial adjustment of the device is effected by moving the shaft 6 laterally by turning an eccentric 8 so that the gears 4, 5, 9, 10 are disengaged. The roller is then turned so that a predetermined minimum amount of web is wound thereon, and the worm 9 and wheel 10 are adjusted so that the stud 13 is opposite to one of the end faces of the helix 9. The gears 4, 5, 9, 10 are then re-engaged. Upon subsequent winding of the web on the drum 2, the wheel 10 carries the stud 13 away from the part of the worm 9, but when, during unwinding from the drum 2, the stud 13 is brought opposite to the end of the worm 9, the worm engages the stud, moving the socket 12 axially and thereby moving the cam 15 into line with and causing actuation of a lever 18 connected to the reversing switch 21 of the motor driving the winding roller. In a modification, Figs. 4 and 5, a worm 27 on the shaft 1 of the winding roller drives two adjacent worm-wheels 25, 26 having different numbers of teeth and having rims 251, 26<1> provided with notches which, when in alignment, are engaged by pawls 28, 29 fixed to a shaft 30. One pawl 28 is operatively connected with the reversing cam 15. The parts are initially adjusted with the notches in alignment with the pawls and a minimum amount of web on the roller, by first disconnecting the worm-wheels from the worm 27 by turning an eccentric 41. In a further modification, somewhat similar to that shown in Figs. 4 and 5, the cam 15 is rigid with the worm 27 which is splined to the shaft 1 and, when the notches in the worm-wheels are in alignment, they are engaged by a single pawl independent of the cam 15, thus stopping the rotation of the worm-wheels. Further rotation of the worm 27 causes it to move axially carrying the cam 15 into the operative position. This movement may also be caused to disconnect the pawl from the worm-wheels. Instead of the worm carrying a cam 15 it may carry a contact disc which upon axial movement of the worm closes a circuit to effect the reversal of the driving motor.