Patent GB-227756-A (GB)
Abstract: 227,756. Gill, H. A., (Registrier Maschinen R÷der Akt.-Ges.). Aug. 25, 1924. Strip and web feeding and guiding arrangements; hammer-impression arrangements. - The impression hammer of the printing-mechanism in crank-operated cash registers, calculating-machines, &c., and the stripfeeding mechanism, are mounted upon a frame which is normally disposed beneath a slot in the casing and is moved under the set type-carriers to receive an impression, after which it is returned to its normal position. The slot is of sufficient size to reveal a number of successive impressions and to render the strip 24, Fig. 1, accessible for the addition of written notes. The frame 8, consisting of a sheet metal plate with a flat upper surface 17 and downwardly bent sides, is carried upon a slide 7 which moves horizontally between flanged guide rails 6 on a base 1. The slide 7 is automatically locked in its normal position and carries means to enable it to be released and traversed bv a rack 10 driven by a pinion 9 on a main driving shaft 3 which is adapted to be rotated in both directions. The vertical movement of the frames 8 is produced by two pairs of links 30, 31 which are coupled between a pivot 32 on the underside of the flat surface 17 and a transverse axle 33 carried by the slide 7. The upper and lower links are provided with guide rollers 35 bearing upon an arcn-shaped guide 16 mounted on the slide 7, and each of the lower links is provided with a toothed segment 34 at its end to engage teeth upon the rack 10, whereby the horizontal movement of t.he latter produces the raising or lowering of the frame. The rack teeth engaging the segment 34 are preferably of smaller pitch than those engaging the pinion 9 of the main drive. An additional guide and support for the frame 8 is provided by a vertical guide column 15 on the slide 7 engaging guide rollers 21 mounted upon a vertical plate 20 on the underside of the frame. The impression hammer 18 is guided within two lugs 19 on the plate 20 and is adapted to be projected through an aperture in the plate 17 to press the registering strip against the set types when its lower end is struck by a cam 47 on a. rotating shaft 36. This occurs immediately after the reversal of the direction of rotation of the. shaft 3, and after a cam 46 on the shaft 36 has actuated the impression hammer to press an inking-pad 39 against the set row of types. A spring returns the impression hammer to its normal position. The shaft 36 is mounted in bearings on the main frame and is driven by a toothed wheel 38 engaging a similar wheel 37 on the main shaft 3. Automatic coupling between the rack 10 and the slide 7 is provided by a pair of arcuate links 11, Fig. 4, which are pivoted at one end to the slide and near the other end are pivoted to the outer ends of a pair of links 12, the inner ends of which are pronged and are pivoted together above the rack 10. The outer ends of the links 11 are pointed and in the normal position engage within notches in the flanges of the guide rails to lock the slide. When the machine is operated, the main shaft 3 is first rotated clockwise and moves the rack 10 freely within a groove in the slide, until a pin 14 on the rack engages between the pronged ends of the links 12, causing the links to fold inwardly to withdraw the locked ends of the links 11 to release the slide, and also gripping the pin 14 to establish connection between the rack and slide. The initial movement of the rack 10 also actuates the toothed segments 34 on the links 30, 31 which lower the frame 8 to the position shown dotted in Fig. 1. The rack 10 then draws the slide 7 and frame 8 horizontally until the impression hammer 18 is disposed beneath the type-wheels and is actuated to press the inking-pad upon the set type. The main shaft 3 is then reversed and the cam 47 actuates the impression hammer to effect the printing before the return movement of the slide begins. Line-spacing mechanism. - Line-spacing is effected during the return of the frame 8 from the printing position, a ratchet wheel 26, Fig. 1, on the winding drum 23 being engaged by a pawl 27 pivoted on a lever 28, which swings upon the axis of the drum against the tension of a spring. As the frame approaches its lower position beneath the casing slot 13, the lower end of the lever 28 strikes a stop 29 upon the base plate and turns the ratchet wheel through the space of one tooth. The stop 29 is, pivoted to swing without actuating the ratchet wheel when the lever 28 strikes it during the forward movement of the frame. Pad inking-arrangements.-An ink-soaked pad is mounted in a holder 39, Fig. 1, on an arm 40 secured to a sleeve which is loosely mounted on the shaft 5 supporting the concentric sleeves of the type-wheels. The sleeve carries a pinion 42 engaging the upper of a pair of toothed segments 45 mounted on a pivot 44, the lower segment 45 being engaged by a pinion 43 on the shaft 36. Mounted on the shaft 36 is a toothed wheel 38 engaging a driving pinion 37 on the main shaft 3, the teeth being so arranged that the pinions 43, 45, 42 operate to swing the inking-pad beneath the set type-wheels while the rack 10 is drawing the frame 8 towards the printing position. The pad is pressed against the set types by the hammer 18 actuated by a cam 46 on the shaft 36.