Patent GB-774253-A (GB)
Title: Punching mechanisms with co-ordinated punch checking means
IPC: G06K5/02
Filed: 1955-07-15
Abstract: 774,253. Selective punching machines. INTERNATIONAL BUSINESS MACHINES CORPORATION. July 15, 1955 [July 19, 1954], No. 20518/55. Class 31 (2). A cyclically operable card punching machine in which punch actuating means is arranged to operate an associated punch for each card column comprises checking means operable by the punches associated with a plurality of the card columns to give one indication when all of the said punches have each been operated only once and a different indication whenever any punch has operated more than once or has failed to operate in any one cycle. As shown, each punch 23 has pivoted to the upper end thereof a spring-influenced hook 26 which is connected by a link 40 to an arm 41 forming part of an armature 42 of a punch magnet PM. The punches are selectively operable by means of a plate 55 engageable with notches 60 in the hooks 26, the plate 55 being secured to a pivotally-mounted frame 46 which is vibrated continuously from a driven cyclically operating shaft 54, Fig. 1. The hooks 26 are adapted to operate spring-influenced slide latches 80 which are each provided with notches 93, 95, Fig. 5, engageable with a hook 92 on a hook 26 and with notches 83, 94, 96 engageable with a projection 84 on a fixed knock-off bar 56. Associated with the card columns are contacts 72 arranged in series and formed by pivotally-mounted resilient contact wires 73 co-operable with contacts 74 fixed in a bar 70 of insulating material attached to the vertical limb of a fixed L-shaped bar 67. In the normal position of the parts, the contacts 72 are kept open by means of buttons 87, and the notch 83 on a latch 80 engages the projection 84 on the knock-off bar 56. On energization of the punch magnet PM, the hook 26 is moved clockwise and the hook 92 thereon engages the lowermost notch 93 of the associated latch 80 whereupon movement of the hook 26 and punch 23 downwardly by the plate 55 causes the latch 80 to be moved downwardly one step. In this step movement, the notch 94 on the latch catches under the projection 84 of the knock-off bar. As the notch 94 is disposed inwardly of the notch 83, the latch moves slightly clockwise about bar 67 to enable the button 87 to be moved by the associated contact wires 73 so that the latter close the related contacts 72. When the punch is returned upwardly, the hook 26 moves counterclockwise under spring action, and the hook 92 disengages from the notch 93 and is aligned with the notch 95 of the latch. If the punch magnet is again energized to effect a double punching in the column, the downward movement of the hook 26 will, through the engagement of the hook 92 and the notch 95, effect a second downward step movement of the latch at which time the notch 96 will be caught underneath the projection 84. The notch 96 is disposed at the same inward relationship as the notch 83 so that the latch will move slightly counterclockwise about the bar 67 so that the button 87 will open the related contacts 72. If there is no punch operating stroke in a column during a punching cycle, there will be no movement of the latch 80 and the contacts 72 will remain open. The contacts 72 are included in an electrical circuit, Fig. 6 (not shown), containing a lamp which is lighted when a punch is operated more than once or fails to operate in any one cycle. At the end of a cycle, a shaft 100 is rocked clockwise and causes a plate 82 to engage all the latches 80 to move them slightly so as to disengage the notch 94 or 96 from the projection 84 on the knock-off bar 56 enabling the latches to be raised to their normal position under spring action and the contacts 72 to be restored to their normally-open position. U.S.A. Specifications 2,500,288 and 2,531,873 are referred to.