Patent GB-758322-A (GB)
Title: Improvements in or relating to power driven tape punching machines for perforating a tape in accordance with a code
Filed: 1952-07-08
Abstract: 758,322. Punching. KILLIAN, C. H. July 8, 1952, No. 34920/54. Divided out of 758,242. Class 83 (4). [Also in Group VIII] A machine for punching a metal tape comprises a number of sets of sensing elements 70, Fig. 11, mounted to reciprocate into and out of a sensing chamber a, a number of complementary sets of punching elements 102 mounted to reciprocate into and out of a punching chamber b, and mechanism interconnecting the respective complementary sets of elements to select a punching element in each set of punching elements upon the relative displacement of the sensing elements in each complementary set of sensing elements whereby, during operation of the machine, a blank tape fed through the punching chamber is perforated in accordance with a code determined by the sequence of displacement of the sensing elements by engagement with means introduced into the sensing chamber. The latter means comprise a tape which is fed by sprockets 60, 62, Fig. 12, which may, or may not, be fully intermeshing. The blank tape may be fed in a similar manner by a shaft 11 and a single pair of sprockets on adjacent shafts 61, Fig. 11, which take up the drive on the newly punched marginal holes. The teeth of the sprockets are of cycloidal or involute form and may be of rubber. Pockets at the bases of the teeth prevent the tape being held fiictionally and receive any burr. Alternatively, the sprocket shafts 61 may be slightly separated by cam means when the tape is stationary. Burrs may be removed by running the tape through several times before the machine is used. The sprockets are rotated intermittently by Geneva mechanisms rotated from a motor M through shafts 10 or 11 or independently by hand or power. The tape is fed to the sprockets by rolls 49 bearing sprockets 471, and rotated by the motor M through a clutch or belt drive, a main shaft 10, and gears 14, 41- 45 and 47, Figs. 12 and 14. Either of two gears 50 on the axially-movable reversing shaft 51 engages a gear on one of the rolls 49 to rotate the frictionally driven reeling drums 55. The rolls, may be etched and the natural curl of the tape used to assist in stripping. The nip of the rolls is spring-adjustable. The reeling mechanism is started by a button 124 and is stopped in either direction of movement by the tape and associated switching devices SD, SR, 120, 121. The sensing pins 70, Figs. 9, 11 and 16 (diagrammatic) are spaced apart by the same distance as the groups of perforations (e.g. Group 9, Fig. 5). Each pair of pins is carried on a shaft 71 which is mounted on a carriage 30 advanced by eccentrics on the shaft 10 through links 29. Two tapes are fed through the machine. Thus in Fig. 11, the upper tape is sensed and the lower one is a blank tape to be perforated. As the shaft 71 is advanced it is rocked as one of the pins engages a hole and the movement is exaggerated by co-operating wedges 80, 81, the wedge 80 being formed on a member 72 pivotally linked to the sensing pin carriers 75. The pins are centralized by spring plungers 79. Centralizing bars' 101 may also be provided. Movements of the members 72 control the positions of gags on a carriage 20, which is reciprocated through links 19 by eccentrics on the shaft 11 opposed to the eccentrics 17 on the shaft 10 for the sensing carriage 30. (Alternatively, the shaft 11, or both shafts, may carry the eccentrics or the carriages may be reciprocated by cams.) The carriage 20 carries a gag 100 corresponding to each pair of sensing pins and operates the punches 102. The pairs of punches 102 may be linked to rocker arms as are the pins 70, to prevent double punching positively. The machine may be used as a manual or duplicating punch or a counting punch. When used as a manual punch for preparing tape fragments, a series of slides 116, Fig. 26, having recesses 115 spaced by the distance apart of the sensing pins, replaces the sensed tape. Each slide is positioned by hand or automatically by a cam 117, Fig. 3. Dowel bolts f allow the upper part of the frame to be raised for free access to the tape. Bolts k allow a tape-feed mechanism to be removed. The finished tape may be used to control a machine tool as described in Specification 758,242.