Patent GB-190825846-A (GB)
Title: Automatic Web-guiding Device.
Inventor: SEFTON-JONES HERBERT
Filed: 1908-11-30
Granted: 1909-11-04
Abstract: 25,846. Jones, H. Sefton-, [Lewis, W. I.]. Nov. 30. Feeding-apparatus for webs.-In a web-guiding device of the type having a detector roll to ascertain the position of the margins of the web, and transversely movable edge-positioning bars under the control of the detector roll, which is furnished with radially-movable spring-pressed pins, (1) the springs for operating the detector pins 7 are dispensed with and the pins are operated by gravity alone, (2) one or more movable members 28 are placed between the detector pins 7 and each shifting-cam 81, (3) the detector roll 4 is made of telescopic construction so that the roll may be lengthened or shortened to correspond with various widths of web, and (4) means are provided for adjusting the edge-positioning devices to vary transversely the path of the edge of the web. The web a passes under a guideroll 2, over a tension roll 3, under the detector roll 4, over a rotatable series of edge-positioning bars 5, and under a guide-roll 6. The shifting- cam 81 is formed on a sleeve 8, which is slidable on, and is held from rotation relatively to, a shaft 9 by a yoke 10, which is pivotally connected to a swinging guide or annulus 11. The above parts may be in duplicate or single. The bars 5 are each provided with a roller 13 engaging the surface of the annulus 11, and are pulled towards the middle by springs (not shown). The rotating support for the edge-positioning bars 5 comprises a rotatable shaft 14, and guiderods 17 fixed to heads which are in turn fixed to the shaft 14. The bars 5 are slidably mounted upon the guide-rods 17. The outer surfaces of the rods 5 are roughened or provided with suitable material to ensure a firm grip on the web. (1) Each end of the shell of the detector roll 4 is fixed to bars 19, which are secured to a sliding spider 20. Each bar has a series of radial holes in which the detector pins are retained. The shell is provided with smaller holes through which the reduced outer ends of the pins may project. Gravity alone is depended upon for causing the pins to project from those holes on the underside of the roll that are uncovered by the web. (2) The fixed bars 19 are each provided with a recessed back in which a movable bar 28 is slidably mounted. Each bar 28 is provided with a shoulder 281 for engaging with the pins 7 and a roller 30 for engaging with the cam-groove 81 on the sleeve 8. (3) The length of the roll 4, Fig. 3, is adjusted from a handle 23 by means of the right and left handed screw shaft 21, operating at each end a nut 24 to which the spider 20 is connected by a key 25. This key slides in a longitudinal slot 27 in the hollow shaft 9 and causes the roll 4 to rotate with the shaft 9. (4) To enable the delivery sides of the annuli to be adjusted to correspond to the width of the web, each pivot pin 12 is engaged with a block 40. The blocks 40 are mounted on a right and left handed screwthreaded shaft 42 operated by a handle 43. Each annulus 11 is formed at its receiving side with a part 114 concentric with the pivots which connect the annulus with the corresponding yoke 10, and at its delivery side with a part 115 concentric with the pivot 12. The rollers 13 are consequently enabled to approach to the same distance from the pivoting axes irrespective of the inclination of the annulus. The device is driven by sprocket-wheels and chains. In use, the rotation of the detector rolls about the fixed cam-sleeves 8 tends to move each shouldered bar 28 in turn first towards the middle of the machine and then in the reverse direction. The movement towards the middle proceeds until the shoulder of the bar encounters a pin which is held in a retracted position by the web. The motion is then transferred to the corresponding cam-sleeve, which in turn moves the leading side of the corresponding annulus away from the middle of the machine. The springs connected to the positioning bar 5 resist this motion and tend to restore the parts to their mid-position. The inward motion of the bars 5 suitably positions the web.