Patent GB-190900712-A (GB)
Title: Improvements in or relating to Adding and like Machines.
Inventor: BOULT ALFRED JULIUS
IPC: G06C11/10
Filed: 1908-01-27
Granted: 1909-04-27
Abstract: 712. Boult, A. J., [Burroughs Adding Machine Co.]. Jan. 27, 1908. Relates to improvements in adding and like machines, d e - scribed with special reference to adding-machines of the Burroughs type as set forth in Specifications 17,126193, 21,268/97, and 27,874/03. Paper - carriages; sheet feeding, guiding and cutting arrangements; platenroller detents. - (1) The platen, mounted on a spindle 15, Figs. 2 and 4, is provided with a cradle pivoted on the shaft 9 and can be thrown backwards into its non-printing position by means of the knobs 16. The forward and rearward positions of the platen are determined by two radial arms 43 upon the cradle, either of which is adapted to engage with the fixed stop 44. The full movement of the platen to either position is ensured by the spring-controlled lever 39, the upper end of which bears a roller adapted to engage either above or below a projection 38 and to hold the platen firmly in either position. (2) Rollers 27, Figs. 2 and 10, made in sections and carried by pairs of arms 28, independently spring-controlled, keep the paper pressed uniformly against the platen. On pressing forwards the thumb-lever 34, the shaft 9 is rocked and fingers 32 thereon engage with studs on the arms 28 and disengage the rollers from the paper. The paper is guided by adjustable rear gauges, a curved bottom plate, and a front plate slotted for the passage of the type. Narrow paper is passed under a cross-rod at the top provided with a cutting-blade. (3) The platen is provided with an alining-wheel engaged by a roll on a spring- retained pivoted arm. Platen scales; printing-line indicators.-When the platen is in its non-printing position, the graduated upper edge of a spring-controlled gauge 22, Fig. 11, rests against the paper and indicates the printing-line, the graduations determining the printing point. Line-spacing mechanism.-When the platen is thrown back from printing-position, the camshaped lower end of a bent lever 68, Fig. 2, is pressed forwards by engagement with a fixed lug 69 ; its upper end is thus moved rearwards and engages with a stud 53<a> on the line-spacing pawl 53 to disengage it from the ratchet-wheel 52. The pawl 53 is actuated by means of a cam 83, a lever 78, and a sliding bar 74. The bar 74 is provided with a fork 72 which rocks a bail 71, 70, a shaft 7, and a lever 64. A stud 65 at the end of the lever 64 engages an adjustable tappet-piece 60 mounted in a recessed arcuate slot in a pitman 57, which is pivoted at its upper end to the stud forming the pivot of the pawl 53. By positioning the tappetpiece in one of the four recesses provided, the extent of feed of the platen can be varied from the maximum to zero. Overthrow of the pawl 53 in either direction is prevented by a stop-arm 66, the top of which limits the downward movement of the stud 56, while its lower end determines the upward movement of the tappet-piece. Tabulating - mechanism.-Transverse movement of the carriage is effected by a coiled spring 145, Fig. 11, through a steel tape 94, and its various columnar positions are determined by adjustable stop-fingers 92, Fig. 9, mounted upon a spring-controlled rock-shaft 8. Any one of these fingers is adapted to engage a notched stop-plate 91 at the rear of the machine, from which it can be released by pressing the thumb-lever 143, Fig. 2, and thus rocking the shaft 8 through the plate 141. The movement of the shaft 8 is limited by a stud 148 adapted to engage the sides of a notch in the plate 141.