Patent GB-1180753-A (GB)
Title: Web Handling Apparatus
IPC: G03B21/43
Filed: 1967-04-21
Abstract: 1,180,753. Feeding record tapes. BELL & HOWELL CO. 21 April, 1967 [16 May, 1966], No. 18350/67, Heading G5R. [Also in Division G2] Apparatus having means for automatically removing the lead end of a film or web from a supply reel and later re-winding the film on the reel, comprises a reversibly driven friction roller 97 selectively engaging the reel 25 or film roll 19 for application of reversible drive torque, shiftable drive torque transmission means being operably connected to the roller 97 for reversing the drive to the reel and film for re-winding, solenoid operated transmission shifting means being provided which are controlled by an electrical circuit sensitive to the presence of the film for reversing the output of the torque transmission means. The transmission means (51), Fig. 3 (not shown), is powered by worm (53) on driven shaft (55) and meshing with spur gear (57) on shaft (59), thereby driving an elongated gear (61) on the same shaft. A reverse gear (71) on shaft (69) is carried on a mounting plate (65) rockable about shaft (59). Gear (71) continuously engages the gear (61) and a threading gear (75) on shaft (73) also carried on plate (65). Reduced gear (79) and re-wind gear (81) are co-axial with gear (75); gear (79) meshes with gear (63) co-axial with, but spaced from the elongated gear (61). A horizontal shaft (83) parallel to shafts (59, 69, 73) is shiftable to two axial positions in which a pinion (85) and spur gear (87) on the shaft may mesh with respective gear (81) or (75). The reel driving roller 97 is rotatable on a pin 95, Fig. 1, shiftable in an open slot 93 in a roller mount 91 shiftable with shaft 83, the roller 97 being spring-urged against a driving roller 90 on the shaft 83. Roller 97 is in vertical alignment with one of the reel flanges 23 in one position of shaft 83, and in the other position is aligned between the flanges to engage the film roll. The electrical circuit of Fig. 10 (not shown), includes a cycle switch (103) whose closure energizes solenoid (109) to shift the shaft 83, when the arm (45) of the web-sensing switch 43, Fig. 1, is in the normal, no-film position. Arm (125) of "thread-re-wind" switch (127) is aligned with shaft 83 and is spring-biased against the "re-wind" position. In the "thread" position solenoid (133) is energized to control spring- loaded connecting-rods 151, 153, Fig. 1, through the bracket 139 pivoting at 141. Rod 151 separates gate member 34 from member 36 and also disengages locking arm 165 from an annular recess in shaft 83 whereby the shaft may return to its normal position under spring- loading. Solenoid 133 also controls the attitude of roller 97 through rod 153 the roller mount 91 being tilted by a horizontal connector 183. Self-threading.-Switch (103) is closed to shift shaft 83 and bring roller 97 into driving contact with film roll 19, the spring-loaded arcuate stripper member 195 being released to swing to the position of Fig. 8 (not shown) and guide the film end into the rockable track section 27. The film is then directed into the gate section 35 by rollers 37, 38. In passing through the subsequent right-angular track 39, the film closes the arm of switch 43 thereby de-energizing solenoid (109) and returning shaft 83 to the normal position; switch arm (125) is thus released to return to the "re-wind" position, Fig. 10, so breaking the "thread" circuit and de-energizing solenoid (133). Drive to roller 97 now stops. Bracket 139 tilts anticlockwise restoring gate section 34 to the projection position and also rocking roller mount 91 to the normal position, the movement retracting stripper 195. Re-winding.-The film end is connected to the driven take-up spool and drawn from reel 25 until the tension increases and tilts track section 27 so that actuator 223 closes switch arm 217. The "re-wind" circuit then energizes solenoid 133 and roller mount 91 is shifted to engage driving roller 97 with a reel flange of reel 25 for re-wind. As the re-wound film-end leaves switch 43, solenoid 133 is again de-energized and re-winding stops. Reverse winding is possible at any time, by rocking gear mount 65, to engage gear 71 with gear 87, gear 81 thereby disengaging with gear pinion 85. Mount 65 is shifted by a manually controlled lever or a solenoid.