Patent GB-191207017-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
IPC: B41J25/24
Filed: 1912-03-21
Granted: 1912-11-21
Abstract: 7017. Fell, J. C., [Yost Writing Machine Co.]. March 21. Type - lever actions; case-shift and carriageshift mechanism; alining for impression.- (1) In machines having an action which is shifted for change of case, means are provided for moving part of the action in a direction at right-angles to the shift - movement of the type-basket so as to maintain the same working conditions for the action in the normal and the shift positions. The invention is shown applied to an action in which the type-levers 22 are carried by links 24 and are coupled to the keylevers 7 by levers 18, links 12, 17, and sublevers 13. According to the invention, the segment 16 carrying the sub - levers is arranged to move horizontally to the front when the type-basket 97 is depressed for change of case. The type - basket consists of side - arms 36 formed integrally with the segments 20, 26 which carry the levers 18 and the links 24. The type-basket is mounted on pairs of parallel links 42, 43 pivoted to the framework and to depending arms 37 formed on the side-arms 36, the links 42, 43 being parallel to and of the same length as the action-links 17. The segment 16 is mounted at the top on rollers 55, which run in ways 56 in the framework and are coupled by links 53 to the arms 37. The segment 16 is also coupled by a central link 58 to the segment 20. The shift-key levers 69, provided with a locking-key 74, are coupled by links 67 to the arms 37. When the type-basket is depressed by the shift-keys, the segment 16, with the sublevers 13, is moved horizontally, thereby causing the links 12 to turn without depressing the key-levers. (2) The shift-movement of the type-basket is limited by silent-stops 62, 63 secured to the arms 37 and adapted to engage fixed stops 65, 66, the stops consisting of disks of parchmentized or indurated fibre and being mounted eccentrically for adjustment on holding-screws 64. (3) The type-basket is connterbalanced by springs 81, which move bodily with the basket, the springs being secured at the bottom to extensions 79 of the links 43 and at the top to the side-arms 36 by means of headed screws 83 engaging nuts 82, which are threaded externally to receive the springs. When the basket is depressed, the ends of the extensions 79 travel more quickly than the typebasket and stretch the springs. (4) To prevent lateral vibration of the type-basket, links 84 extending laterally of the machine are provided, the links being pivoted at 92 to the framework and being formed with enlarged apertures to engage a collar 88 secured to a bracket 89 on the type-basket. The lost motion between the links and the collar is taken up in the normal and the shift positions, the right-hand link and the left-hand link acting respectively to prevent vibration of the basket to the left and the right. The pivots 92 are formed on brackets 94, which are adjustable laterally and are secured by screws 95. The bracket 89 is secured by screws 90 to a cross-bar 38 and by a screw 91 to the segment 20. (5) The alinement-guide 39 is secured by screws 41 to the cross-bar 38. (6) The arrangements described in sub-paragraphs (2), (3), and (4) above are applicable to machines having carriage-shift mechanism.