Patent GB-394158-A (GB)
Title: Mechanism for registering a continuous web of wrapping or other material
IPC: A24D1/16
Filed: 1932-08-12
Abstract: 394,158. Feeding webs. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.- (International Cigar Machinery Co. ; 5520, 2nd Avenue, Brooklyn, New York, U.S.A.) Aug. 12, 1932, No. 22607. [Class 100 (i).] In a device for registering a continuous web of wrapping or other material having recurrent portions of different optical characteristics from the remainder of the web, an electromagnetically-operated clutch is provided to interrupt the operation of the web-feeding means when one of these recurrent portions varies the effect of the light from a suitable source upon a photo-sensitive device, and the operation of the clutch mechanism causes the application of a brake to stop the web-feeding means and to hold it immovable for a predetermined time. The invention is described with reference to a cigar-wrapping machine. The web W is fed forward to the cutting-mechanism by feedrollers 15, 16. The roller 16 is geared to the roller 15, and the latter receives its intermittent drive from a gear 19 fast to a shaft 20, which is actuated by an electromagnetic clutch 46, 47. The movable clutch element 46 is carried by a sleeve 49 surrounding a second sleeve 44, and the shaft 20, which is mounted within the sleeve 44, is provided with a key 45 extending through an elongated slot in the sleeve 44 and fitting a slot in the sleeve 49, whereby the shaft and sleeves are connected for rotary movement, but axial movement of the shaft and sleeve 49 relative to the sleeve 44 is permitted to disengage the clutch parts and stop the feed. This axial movement occurs when the light is intercepted by a registering mark on the wrapping material, the circuit on an electromagnet 53 being then completed by a rotary contact maker 63<1>, whereby the armature 52 of the magnet is attracted ; this armature is mounted on the axially-movable shaft 20, and this movement serves to disengage the clutch parts against the action of the spring 51. The electromagnet is maintained energized by a second rotary contact member 63 for a predetermined time, and the attracted armature 52 serves as a brake to hold the feed rollers immovable. The rotary contact elements 63, 63<1> are mounted on the shaft 11 oi the turret mechanism 12 of the wrapping-machine, and comprise conducting segments 65 and non- conducting segments 65<1>. Light from the lamp 67 normally falls on the photo-sensitive device 69 and the current, suitably amplified by a vacuum tube 91, serves to energize an electromagnet 92 and thus hold open contacts 92a, 93. When the current decreases due to the passage of a mark on the web between the light and the cell 69, the contact 92a falls under gravity and completes the circuit of the electromagnet 53 through the contact device 631. The electromagnet thereupon attracts its armature 52, and disconnects the clutch members. The shaft 20 also carries an extension 55 which operates a spring-held lever carrying a roller 60, and the axial movement of the shaft 20 serves to close additional contacts 62 which complete the circuit of the magnet 53. through the second rotary contact 63, thereby short-circuiting the contact 63<1> which is dependent for its operation on the photosensitive device 69. The feed-rollers are thus held immovable until the circuit of the magnet 53 is broken by the rotary contact 63. The light source 67 and the cell 69 are mounted in casings capable of vertical or horizontal adjustment, and the web may be normally transparent with opaque marks thereon, or vice versa. The web, which is carried by a vertical spindle 14, is guided to the cutter by a horizontal support at its lower edge, and at its upper edge by an endless band 36 driven from the roller 16 and co-operating with fixed supports. The cutter blade 24 is actuated intermittently by a cam 31 on the shaft 11, which co-operates with a cam follower 30 to impart, through the medium of cranks 27, 25 and a link 26, an intermittent motion to a shaft 23 on which the blade 24 is mounted, and the turret 12 of the machine receives an intermittent motion from the shaft 11 through a Geneva gear.