Patent GB-370496-A (GB)
Abstract: 370,496. Cash registers. NATIONAL CASH REGISTER CO., Dayton, Ohio, U.S.A.-(Assignees of Robertson, W. H.; 1302, Patterson Road, Dayton, Ohio, U.S.A.) Jan. 10, 1931, No. 901. Convention date, Jan. 10, 1930. [Class 100 (iv).] Hammer; impression arrangements.-In a printing-mechanism for a cash register particularly designed for postage work, the type wheels 575, 576, Fig. 16, are set in the usual manner by the differentials of the various banks and the hammers 612, 613 are operated to print upon a record-strip kept in the machine and upon an issuing record-strip and voucher strip, the two latter imprints being obtained by repeated impressions from the type-wheels 576. The hammers are operated from a shaft 1 provided with a two-lobed cam 632, one lobe 633 being masked, as regards its action on hammer 612, by a sector 638. The hammer-driving lever 619, besides bearing on the sector is controlled by the driving-lever 631 through a stud 635. Thus during the passage of the first lobe 633 the sector holds up the lever 619 to prevent an impression on the permanent record-strip and when the second lobe releases the lever 631 both hammers are operated. The hammer 612 operated by the lever 619 through a pin 617 is extended at 646 and carries a stud 645 normally occupying a recess in a spring-controlled pawl 647 and a second and larger recess in a detent bar 649 slidable lengthwise with respect to the pawl. A the hammer is cocked the stud cams the pawl and bar counterclockwise about the pivot 648 until,the bar takes under a fixed pin 651. When the hammer is operated for striking, the stud is thus unimpeded by the pawl and bar, and on reaching the end of recess in the latter urges this to the left so that it resumes the position shown, and the pawl is thereby restored to seize the stud and prevent rebound. The other hammer 613 is provided with similar reboundpreventing means, including a stud 654 on the hammer, a pawl 656, and a detent bar 659 co-operating with a fixed pin 662. The voucher strip 697, Fig. 18, is of half the width of the record-strip 799 and receives only the pressure of the portion 684 of the platen 611. The portion 680 of the platen strikes the strip only and therefore, in order to prevent a double impression, this portion is movable automatically so as to withdraw it from the types during the first of the two blows. To this end the portion 680 is mounted on spring-controlled plungers 682, 683, bearing against cams 690 on a shaft 691, linked at 694, Fig. 16, with an indicator-aligning shaft 426. When this shaft rocks clockwise at the commencement of an operation the shaft 691 is turned so as to allow the platen portion 680 to be withdrawn. The first impression is therefore made only on the voucher, but before the second blow occurs the shaft 426 is rocked back again and the platen portion then becomes effective to print on the strip. The ticket strip is fed by a roll 699, Fig. 17, driven by a pawl 716. When a transaction key other than the " List Postage " key is used, the displacement of sector 165 places a pin 722 into the path of the tail of this pawl so as to disable the feed. Similarly when the total lever is set for taking a total or subtotal the pin is made effective by means of a cam 218, Fig. 11, acting upon an arm 225 of the shaft 169. The printing-hammer 613 is also disabled when no ticket is to be issued by the interposition of an arm 674, Fig. 17, to stop'the retraction of the hammer preparatory to the first blow. The arm is shifted by the machine through the medium of a reciprocated pitman 672 when a thrust member 663 displaces an arm 667 connected by a spring 668 with the arm 674 carrying a pin engaging a slot in the pitman.