Patent GB-648922-A (GB)
Abstract: 648,922. Calculating-apparatus. NATIONAL CASH REGISTER CO. March 1, 1948, No. 6433. Convention date, July 10, 1947. Addition to 631,446. [Class 106 (i)] According to the parent Specification, an accounting - machine includes means to couple driving means to the main operating mechanism, means normally holding the coupling means in uncoupling position, a first mechanical linkage connected to the holding means, a second mechanical linkage normally maintaining the holding means in effective position, spring means urging the second linkage to disabled position and a stop member associated with a machine starting member normally preventing movement of the second linkage and adapted, upon operation of the starting member, to permit the second linkage to move to disabled position. According to the present invention, the stop member comprises a latch and there is provided a shifting member operated by the starting member to disable the latch to release the second linkage to the action of the spring and a restoring device which restores the latch to effective position even though the starting member is held in the operated position. Depression of a starting bar 34, Fig. 1, rocks a yoke 65 and so raises a pawl 60, a shoulder of which engages beneath a bent-over portion 63 of a sprung latch 53 to lift the latch and release a lever 48 to the action of a spring 41 which rocks an arm 43 and the lever 48, to which it is connected by a link 47, clockwise. A lever 124 having a stud 123 held against the lever 48 by a spring is thus rocked counter-clockwise about its pivot 72 and rocks a lever 128 to withdraw a stud 131 carried thereby from engagement in a shoulder 132 of a plate 133. A spring 141, Fig. 5, is thus allowed to rock counter-clockwise a lever 142 connected with the plate 133 by a pitman 135. A release lever 19, secured to the lever 142, then engages a clutch so that a motor 9 is effective to drive a crank 21 coupled to the main shaft 24 through a link 22 and arm 23. In the middle of the cycle, the lever 48 is restored, to be re-engaged by its latch 53, by an arm 44 on the main shaft 24, which arm carries a stud 45 that engages and rocks a tail 46 of the arm 43. The stud 131 in the lever 128 is then urged against the plate 133 and re-engages the shoulder 132 near the end of the cycle when the crank 21 engages a stud in the lever 142 to restore it and break the clutch. An arm 50 fast on a shaft 51 has a projection 149 held against the stud 123 in the lever 124 by a spring and is thus rocked clockwise when the lever 48 is released. An extension 146 of the arm 50 then engages the tail of the pawl 60 and removes its shoulder 62 from the bent-over portion 63 of the latch 53 to allow it to re-engage the lever 48 so that even if the control key is held depressed, the machine stops after one cycle. Lips 31 on the starting bar 34 are engaged when either the skip-tab or vertical feed bars 35, 36 are depressed so that the machine performs one cycle as described. When a control key 37-40, Fig. 4, is depressed, it is held in that position by a sprung latch, e.g. 101, which swings a bar 89 forwardly. The bar rocks a yoke 82 through a lever 86 and the yoke, through a lever 79, Fig. 1, raises an arm (not shown), to which is pivoted a pawl similar to the pawl 60. The latch 53 is thus caused to release the lever 48 as before. To prevent depression of a control key during a machine cycle, the end one of a series of crowding-lock pendants 186 engages a plate 188, having a pivot 187 and a bent-over portion 191, beneath which a plate 193, fast on the shaft 51, engages when the arm 50 is rocked with the lever 48 as the machine is released. Depression of a release key 117, which serves to swing the bar 89 to the rear, is also prevented during a machine cycle by the engagement of a surface 194 on the plate 193 beneath a finger 195 carried by the Release key stem. At the end of the cycle the bar 89 is swung rearwardly in known manner to release any depressed control keys. In order to prevent mis-operation of the machine, locking arms, e.g. 154, are provided which, when the machine should not be operated, are rocked so that shoulders 157 therein engage over a square stud 158 in a lever 159, the rear arm of which overlies the rear arm of the lever 124. The lever 159 carries a pawl 163 which engages a stud 164 in the main motor-bar stem so as to prevent its depression if a locking-arm is effective. Normally, as the main motor bar is depressed, a tail 167 of the yoke 65 engages a stud 166 in the pawl 163 to withdraw it from abutment against the stud 164 to release the lever 159 so that, if necessary, it can be reengaged by a locking arm. If a locking arm is effective when a control key 37-40 is depressed, the lever 48 is released and the lever 124 rocks through a small angle to cause the stud 158 in the lever 159 to bear against the shoulder 157 in the locking arm so as to prevent its disengagement. A hand lever 168, having a knob 169 and fast to the lever 124, has then to be rocked clockwise to re-engage the lever 48 with the latch 53 and to enable the locking arm to rock when the condition preventing operation of the machine is removed. A locking arm 54 may be connected through arms 173, 175 on a shaft 174 and a link 176 to a lever 177 having a cam nose 179 which co-operates with a carriage stop 180 so that when the carriage is in a selected position, the locking arm is made ineffective. In this case, the locking arm may have a roller (not shown) on its shoulder 157 so that, if a control key 37-40 has been depressed as the carriage is traversing the machine, when the carriage reaches the selected position, the locking arm can dis-engage the stud 158 to release the machine for an operation. Specifications 28253/08, 445,281, and 497,640, [Class 106], are referred to.