Patent GB-972346-A (GB)
Title: Web winding apparatus
Inventor: PLEVIN HAROLD
IPC: B65H18/16
Filed: 1962-10-17
Abstract: 972,346. Winding webs. C. A. HARNDEN Ltd. Oct. 4, 1963 [Oct. 17, 1962], No. 39264/62. Heading B6B. In web winding apparatus of the type wherein a plurality of individual webs are wound on to cores provided on and frictionally rotated by a common wind-up shaft which rotates at a higher speed than is necessary for effecting winding, the cores 18, Fig. 3, are mounted on the shaft 11 by way of shoulder rings 17 disposed between driving disc 15 constrained to rotate with the shaft 11. Frictional drive between the rings and discs is achieved through felt rings 19 and axial loading. The invention is characterized by sensing means adapted to sense the diameter of one of the wound web-rolls, and as the diameter increases, to increase the axial loading of the shoulder rings 17 and driving discs 15 to increase the friction therebetween. As the diameter of a web-roll 13 increases, Fig. 1, a diameter sensing roller 61 moves a gear segment 58 to rotate a disc 55 having peripheral perforations 54. A photo-electric device 53 senses a perforation 54 and actuates a relay to start a one revolution electric motor 49. The motor 49 drives a crank mechanism 47, Fig. 2, which oscillates a lever 44 pivoted at 45. This lever 45 raises racks 35 and 43 via rollers 40, each rack driving a pinion 36 freely mounted on a shaft 32, Fig. 3, associated with each web winding device. The pinion 36 drives via a dog clutch 65, when engaged, a crown wheel 30 which in turn provides axial movement of a threaded spindle 28. This spindle acts via a roller 27 on a two-armed lever 26, which in turn acts on a thrust bearing 25 to load the spring 24 in the telescopic spring housing 21 to increase the friction of the drive to the cores 18. Manual adjustment is achieved with the hand wheel 34 forming part of the dogclutch, when the clutch is disengaged. A microswitch 66, Fig. 3, operates a warning device (not illustrated) and isolates the motor 49 should the spindle 28 be moved such as to cause the lever or fork 26 to be in danger of binding on the shaft 11. In a modification, Fig. 4, the photo-electric device 53 is replaced by a switch 53a mounted on a pivoted lever 53c. A linkage 53d connected to a pedal (not illustrated) allows the switch 53a to be moved away from the disc 55a to stop the machine. In a second embodiment employing similar web-roll diameter sensing devices as above, a single revolution electric motor drives a crank mechanism to reciprocate a toggle lever. The toggle lever acts on a crank connected to a gear-wheel, and by manual adjustment of the toggle lever, the amount of rotation of the gear-wheel can be set. The gear-wheel acts through a gear train to drive a sprocket 88, Fig. 6, via a dog clutch 94a of similar design as above, also provided with a hand wheel 93 for manual adjustment of the axial loading. The sprocket 88 drives a gear 84 via chain 87 and sprocket 85, and gear 84 meshes with a gear 80 which moves axially as it is rotated to increase the axial loading between the driving discs 15 and the shoulder rings 17, via the telescopic spring housing 21. The webroll diameter sensing device may operate an hydraulic arrangement to start the electric motor, and the electric motor may be replaced by a servo device such as a single-revolution clutch. An hydraulic or pneumatic arrangement may be used for sensing the web-roll diameter and an hydraulic or pneumatic source of power may act directly on a thrust element.