Patent GB-297576-A (GB)
Title: Improvements in and relating to the joining of telegraph and similar tape
IPC: G06K21/08
Filed: 1927-10-01
Abstract: 297,576. Marks, E. C. R., (Horn, J. A. L., Christensen, J. H. M.). Oct. 1, 1927. Perforated strip transmitters.-The invention enables a portion a, Fig. 5, of a punched telegraphic strip to be cut out and replaced by a fresh portion d punched with holes which bears a correct phase relation to the holes in the remainder f, g. of the tape. The portion d is affixed to the portions f, g, by means of short overlapping gummed slips e, e, which are fully punched at h and have a gummed or otherwise adhesive surface. A machine for effecting the joints is shown in Fig. 1. The gummed strip from which the slips e are to be cut is stored on a spool (not seen) in the casing 1<a>, Fig. 1, and is drawn off by a drum 2 having pins 5 which take into the guide-holes in the tape. The ends of the two portions of tape which are to be joined are fitted to those pins 5 which are accessible at the top of the drum 2, and the button 33 is pressed, whereupon the hammer 13 descends and effects the joint, the knife 8 moves into the groove 4 and cuts the gummed slip e, the hammer rises again, and the drum 2 is turned to the left, the moist pad 9 being pressed upon it during the motion. This cycle of operations is effected as follows. The ratchet wheel 23 rotates continuously, its shaft 24 being coaxial with but separate from the shaft 22 carrying the arm 29. When the button 33 is pressed the arm 32 is moved by linkwork so as to permit the pawl 31 carried by the arm 29 to engage the ratchet 23, the shaft 22 being thus clutched to the shaft 24, whereupon the ratchet carries the shaft 22 through one revolution at the end of which the shafts are unclutched through engagement of the tail 31<a> of the pawl first with the spring 34 and then with the upper end of the lever 32. During the revolution of the shaft 22 the cam. 26 permits the lever 35 to be drawn forward by the spring 36. The bell-crank 39 is thus rocked by the link 37. and the hammer 13 carried by its axle 20 is brought down on to the slip on the drum 2. The hammer head during its inactive period was in contact with an electrically heated copper block 54, so that the joint is effected by heat and pressure, the slip having previously been moistened by the pad 9. The pressure is increased by a cam 21 which for a time presses upwards on the resilient tail 53 of the hammer. During the downward motion of the hammer the pawl 41 is lowered by the link 43 so that on the return stroke, when the hammer is raised by the further action of the cam 26, the ratchet 42 is tumed by the pawl 41 and the drum 2 is turned, the slip being picked off by fingers 12. During the movement of the drum the pad 9, which is moistened by water in the tank 57, is pressed against the slip by the spring 47, its motion being controlled by the projection 28 and spring 45 acting on the lever 44. The circular knife 8 enters the slot 4 and cuts the slip when the tail of the lever 49, which carries the knife, enters, a recess in the cam 27, which immediately afterwards returns the lever to the position shown, a pawl (not shown) co-operating with ratchet 52 to revolve the knife on the return movement. A projection 50, taking into a slot 51, ensures that the knife shall not complete its forward motion unless the drum 2 be in the correct position. The hammer 13 can, if desired, be held off the drum 2 during the cycle of operations by the interposition of a manually operated bar.