Patent GB-670783-A (GB)
Title: Improvements in or relating to devices for intermittently advancing a continuous web
Inventor: BRADLEY BASIL EDWARD
IPC: B41L47/24
Filed: 1949-01-04
Abstract: 670,783. Feeding webs. EGRY, Ltd. Jan. 2, 1950 [Jan. 4, 1949; March 25, 1949], Nos. 212/49 and 8221/49. Class.100 (i). A feed device of the type in which a continuous web is fed intermittently by a roller, comprises a rotary feed mechanism including a rotary spindle, intermittent uni-directional drive means for said spindle, a friction clutch connecting the drive means and spindle, means for locking said spindle at predetermined positions of the web, the latter means including a fixed member, a wedging member, means normally urging the wedging member into locking engagement between the fixed member and spindle, means for moving the wedging member out of locking engagement and means for holding the wedging member out of locking engagement, and an electromagnetic device operable upon the web reaching a predetermined position for causing the holding means to release the wedging member. A web of continuous stationery having perforations at spaced intervals is fed intermittently from a printing station of an addressing or like machine by feed rollers 22 mounted on a spindle 23. A reciprocating rod 28, Fig. 3, is adjustably connected to a rocking lever 31 having a rack 33 meshing with a gear 34. The gear 34 is freely mounted on a spindle 42 and is adapted to drive a second freely-mounted gear 41 through a friction disc 46. The gear 41 drives a gear 40 which imparts an intermittent drive to the spindle 23 through a uni-directional clutch 35. A roller 50 secured to the spindle 23 is held against rotation by a wedge 51 urged into locking position by a spring 54. A ledge 55 on the wedge 51 is engaged by a bolt 56 when the wedge is withdrawn to retain the wedge in this position. The bolt 56 forms the core of a solenoid 58, whereby when the solenoid is energised by completion of an electrical circuit the bolt is withdrawn. The circuit is'completed when a perforation is directly below a spring urged contact brush 61 normally held apart from a contact plate 59 by the web passing therebetween, this position corresponding to a position of correct registration of the web at the printing station. The contact brush 61 and plate 59 are connected to leads in the circuit which consequently causes energisation of the solenoid and withdrawal of the bolt 56, such that the wedge 51 locks the spindle'23. The disc 46 allows slip between gears 34 and 41 while the lever 31 continues to oscillate. Each time a perforation registers with the contacts 59, 61 the web is retained in a registered position while printing is effected. During the non-driving movement of the lever 31 oscillating synchronously with a lever 69, the lever 69 rocks a spring-pressed bell-crank lever 65, such that the wedge 51 is withdrawn. Previously, when the wedge 51 was moving into locking position a pin 71 thereon separated a second pair of contacts 72 thus breaking the solenoid circuit, such that the belt 56 is spring-pressed towards the wedge to engage it below the ledge 55 until the wedge is withdrawn by the lever 65. A third pair of contact members 73 normally closed are disposed in the solenoid circuit and such that the lever 65, when withdrawing the wedge 51, engages one of them. This ensures that the solenoid circuit is broken when the wedge is withdrawn from locking position and the contacts 72 make contact again. In a modification, the wedge 51 may be replaced by a clutch device that prevents the spindle 23 rotating when the web is correctly registered, such that contacts 59 and 61 make contact and so complete the solenoid circuit. The core of the solenoid when de-energised holds a clutch lever of the clutch device in unlocked position, such that the spindle 23 may rotate.