Patent GB-294951-A (GB)
Title: Improvements in machines for punching rules and similar printing elements
IPC: B41B11/00
Filed: 1927-04-29
Abstract: 294,951. Thornton, A. A., (Chicago Lino- Tabler Co.). April 29, 1927. Punching; punches.-A machine for punching notches in rules and like printing elements to receive triangular rules for printing vertical as well as horizontal lines of tabular matter &c. comprises a number of punch units clamped in spaced relation, ali the punches being simultaneously reciprocated by an operating member, which may be moved into or out of engagement therewith so as to facilitate adjustment of the position of the punch units. Each punch unit consists of a housing 35, Fig. 16, which is secured against the rear edge 9, Fig. 4, of a member 7 screwed to the surface 5 of the base 1, by a clamp 10 which is pivoted at 12 and closed against the action of a spring 23 by a cam 18. The units may be threaded on a rod 70, Fig. 2, with knurled head 71 and secured together in assembled relation with intermediate spacers 72 by a nut 71<1>. The spacers may be tubular or may be made in horse-shoe form of springy metal with protuberances at their slotted end so as to prevent them being accidentally removed from the rod, but so as to allow them to be removed when desired without detaching the punch units. They may also consist of a number of blocks inserted between the punch units and secured by a screw 95. The units may be assembled by placing them in a grooved block 77, Fig. 25, on one side of which is placed a prepared paper copy 79 or on the top surface 81 of which is placed a prepared scale or slug 80. The punch housing is formed with a notch 39, Fig. 16, to engage the shoulders 44 of a rule 42, Fig. 15, or the shoulder of a rule 58, Fig. 13, a notch 54 being made in the punch guide to receive the parts 43 or 59 to be punched. The rule is placed on the member 7 on which a strip 60 may be placed with its upper surface flush with the parts 40 when operating on rules 42 or with two strips 60, 63 when operating on rules 58. The strip 60 may be provided with a scale for purposes of setting the rule and may be placed against a stop 62. When punching long rules, punching may first be effected with the strip and rule against the stop 62, whereupon the stop 62 may be transferred to the other end of the member 7 and the other end of the rule placed thereagainst. Plates 98 with rounded ends 102, Fig. 29, may be mounted on studs 99 secured to the member 7 and engaged by springs 103 so that the rules may be pushed into position and held therein during operation. Filler plates 105 may be arranged between the plates 98 and member. Each punch 36, Fig. 20, may have a triangular lower end 52 and a body part of section 53, Fig. 21, and the upper end is formed with a shoulder 68 which rests on the top of the housing when the operator 24 is out of engagement and acts as a stop. The upper end of the punch is furnished also with a projection 66 to engage a groove 82 in the operator. The operator consists of a lever provided with handles 25 and pivoted on a rod 26, the rear edge having a flat spring engaging under a projection on the post 3 so as normally to retain the handles in their raised position. The rod 26 is secured at each end to eccentrics 27, Fig. 6, rotatable through 180‹ in bearings 30 so as to engage and disengage the operator from the punches. One of the eccentrics has projecting therefrom a pin engaging shoulders on the post 3 at its limiting positions and one of the eccentrics is further notched on its inner surface to engage a spring-pressed ball in the post 2 for the same purpose. The operator has a pin 87, Fig. 6, at its rear end, which normally engages a shoulder 91 in the post 2. In order to disengage the operator from the punches the eccentrics are rotated anti-clockwise from the position shown in Fig. 6, the pin 87 being thus brought out of contact with the shoulder 91, whereupon the operator is swung round on its pivot into inoperative position, the pin 87 moving into the slot 88. In order to re-engage the operator and punches the operator is first swung down until the pin 87 engages the part 89 whereupon the eccentrics are rotated. The pin 87 is thereby engaged with the shoulder. Further rotation lowers the forward end of the operator so that the groove 82 engages the projections 66 and then raises the punch units into operative position. The punches are then reciprocated to form the notches 48, Fig. 15, by pulling down the handles, the post being slotted at 92 to accommodate the pin 87.