Patent GB-870793-A (GB)
Title: Improvements in and relating to power-driven taping machines
Inventor: LYONS PHILIP JOHN
IPC: B65B7/28
Filed: 1960-03-17
Abstract: 870,793. Applying adhesive tape. SMITH & NEPHEW. Ltd. April 6, 1960 [March 17, 1960], No. 9450/60. Class 73. Relates to power-driven taping machines for applying adhesive tape from.-a roll around a container to seal the lid. According to the invention the machine comprises a turntable 24 Figs. 1, 4 fixed at the upper end of a power driven shaft 41 and having rotatable therewith automatic clamping and unclamping means 77, 93 for holding a container on the turntable during a cycle of operations, the shaft 41 being geared to a cam shaft 65 through reduction gearing, one of the cams 73 Figs. 4, 5 on the cam shaft co-operating with a cam follower lever and roller 112, 113 mounted on an axially fixed taping-arm shaft 29 on which is adjustably mounted a taping arm 119 Fig. 8 having at one end a rubber taping roller 133, a spring 114 Fig. 5 being proyided to keep the cam-follower lever and taping arm pressed towards the axis of rotation of the turntable. A spring-urged knife arm 153 carrying a knife 155 and wiper 156 is also pivotally mounted at the end of the taping arm 119. adjacent the roller 133 and is adapted to be held in two positions, one with the spring fully stressed ready for release for cutting of the tape and the other to hold. the knife arm after cutting ready to be returned to the first position, appropriate cams on or connected to the cam shaft having their cam followers connected by Bowden cables 27. 28 Fig. 8 to the cutting mechanism to permit the timed operations of the release and re-setting of the knife arm 153. The tape 137 Fig. 1 is fed to the tape applying roller 133 from a roll 137a mounted on an arm 129 adjustably mounted on the shaft 29. The cam shaft 65 , has secured to it a cam .74 Figs. 4, 6 which carries a roller 75 projecting from its upper surface and a downwardly projecting roller 76. The roller 75 forms a cam for the unclamping and clamping of a spring-pressed slidable clamp part 77 on the turntable. The roller 76 forms a cam for operating, through the Bowden cable 28, the catch release for the knife 155. For this purpose one arm 79 of a lever carries a roller 80 co-operating with the. cam roller 76 and the other arm 81 of the lever has one end of the Bowden cable 28 secured thereto and is normally pulled by a spring against an abutment 82. When the roller cam 76 trips the lever roller 80, the other arm 81 pulls upon the Bowden cable 28 to withdraw the catch on the knife mechanism. The cam 74 co-operates with a roller cam follower 83 mounted on one arm 84 of a bellcrank lever turning on a pivot 85, the other arm 86 being connected to one end of the other Bowden cable 27. The cam 74 imparts a fairly lengthy movement to the cable 27 to re-stress the spring of the knife mechanism but the step in the cam allows a sudden "letout" of the cable (on release of the catch by the other Bowden cable) for quick cutting action of the knife. The cutting action of the knife 155 Fig. 8 is effected by a spring drum 148 having two radial projections 158, 159 adapted to be engaged by a stop or catch 160. One projection 158 is engaged by the catch 160 when the spring is fully stressed so that when the catch 160 is withdrawn by. the cable 28 the knife operates. However the angular movement of the spring drum 148 in the direction of the arrow 157 is limited by its other projection 159 engaging the catch 160 even when this latter is in its withdrawn position. The spring drum 148 is re-stressed by the cable 27 acting on a slide 161. sprocket chain 163 meshing with a sprocket wheel 151 on the drum, the other end of the chain 163 being connected to a tension spring 164 anchored to the taping arm 119. The wiper 156 may be of spongy rubber and wipes down the severed end of the tape. The machine, which is driven by an electric motor 30 Fig. 1 is controlled by a treadle 34 and rod 37 connected to a clutch-operating lever 38 adapted to move a clutch plate 50 keyed to the shaft 41 to connect or disconnect the drive of the motor 30 thereto. In a modification a rotatable clamping plate 170 Fig.' 3 (not shown) co-operates with the turntable which can be moved vertically to clamp the container thereto.