Patent GB-460194-A (GB)
Abstract: 460,194. Cash registers. NATIONAL CASH REGISTER CO. July 19, 1935, No. 20647. Convention date, July 19, 1934. [Class 100 (iv)] [Also in Group XIX] Hammer-impression arrangements.-In voucher and/or slip printing mechanism for cash registers and similar accounting machines, coupling arms are provided for coupling the impression hammer to the actuating means, the said arms being normally uncoupled from the hammer and adapted to be coupled directly and positively therewith only when the hammer is to effect a printing stroke, during which the hammer is moved positively toward and then away from the type member. The printing hammer 11, Fig. 1<a>, for the voucher strip is pivoted on a shaft 12 and operated by a cam 19 through a crank 15 and coupling arms 21. In the normal position of the parts shown, the hooked lower ends 23 of the coupling arms are disengaged from studs 24 on the hammer and rotation of the actuating cam is ineffective: However, during an operation involving the entry of a single-item transaction or the total of a multiple-item transaction, the coupling arms are rocked clockwise to engage the hooks 23 over the studs 24 and thus enable the actuating cam to rock the hammer downwardly to take an impression from the type-wheels 10. The coupling arms are controlled, for this purpose, by a slide 26, the arcuate left-hand end of which abuts a stud 25 on one of the coupling arms while a roller 29 on its right-hand end is embraced by a cam groove in a segment 30 positioned by the differential mechanism in known manner. As shown in Fig. 1<a>, the printing hammer 11<1> for the slip is actuated by a cam 19<1> in a similar manner to the hammer 11 for the voucher, i.e. through bell-cranks 15<1> and hooked coupling levers 21<1>. The coupling arms are controlled by a slip feeler 40 in such a manner that the hammer is actuated during each operation in which a slip is present. The feeler is controlled by a cam 43 and is connected to a slide 32 by a bell-crank 34, a cam slot 36 in which embraces a stud 37 on the feeler. Soon after the commencement of an operation, the roller 42 of the feeler leaves the high part of the cam and allows the feeler to rock clockwise. If a slip is present, the feeler is arrested in such position that the roller enters a circular groove 42b in the cam and the slide 32 is shifted to the left to couple the hammer to its actuators. In the absence of a slip, the roller enters an inner groove 42<a> of the cam and, owing to the shape of cam slot 36, the slide 32 is returned to the right to restore the coupling arms 21<1> to ineffective position. The Specification as open to inspection under Sect. 91, comprises also the hammer-impression mechanism forming the subject-matter of Specification 460,269. This subject-matter does not appear in the Specification as accepted. Web-feeding arrangements.-The voucher strip passes from a supply roll 81, Fig. 1<b>, over a guide roll 83, between feed rolls 84, 85, Fig. 1<a>, beneath tensioning rolls 110, over the typewheels 10 to a severing knife 87. The feed rolls are only rotated in operations in which the hammer 11 is rocked to impress a voucher, in which operations they are coupled to the driving mechanism by means including a pinion 131 rockable with its frame 130 by the shaft 92 that carries the segment 30. To ease the work of the feed rolls a loop is formed in the strip by a pair of rollers 103, 104 mounted on arms 101, 102 and arranged above and below the strip, respectively. At each machine operation, the rollers are moved to the position shown in chain lines to draw a length of strip from the supply roll and are returned prior to the operation of the feed rolls. For this purpose the arms 101, 102 are each rigid with one of two coaxial gears 98, 99, meshing respectively, with the upper and lower of a pair of racks 94, 95. These racks are given a left-andright excursion at each operation by a cam 89 that oscillates a pitman 91 carrying a differential pinion 93 meshing with both racks. The tension rollers 110 are normally held out of engagement with the strip, but, upon release by a cam 117 on a shaft 114, press the strip lightly against the lower wall of the guide way 118. The rollers are geared to the shaft 114 for rapid rotation and serve to maintain the strip in tensioned condition during printing.