Patent GB-191403892-A (GB)
Title: Improvements in and relating to Typewriting Machines, Type Setting Machines and the like.
IPC: B41J19/64
Filed: 1914-02-14
Granted: 1915-07-01
Abstract: 3892. Schnellsetzmaschinen Ges., and Drewell, H. March 7, 1913, [Convention date]. Strip-perforating machines; justifying type; keyboards.-Relates to variable-feed escapement mechanism for use in connexion with typewriter carriages and the line measuring devices of stripperforating and type-setting machines, of the kind in which the feed-movement of the loose pawl is limited by key-controlled stops of different thickness, and consists in mounting the stops so that any combination can be selected. In the typewriter shown, the fast dog 41 is pivoted to the framework at 49, and the loose dog 40 is pivoted on a lever 56 pivoted to the framework at 57 and provided with a lug 58 which can swing against a lug 59 on a lever 60 arranged to swing against a stop 64. To facilitate adjustment, the stop 64 is formed on an adjustable lever 62 which carries the lever 60. The dogs are controlled by pins 39, 38 on a sliding frame 32 which is supported at the rear by levers 33 and at the front by a slot in the segment 36. The frame 32 is formed at the rear as a universal bar 31 engaging rods 8 operated by parts 7 on the type-levers 5. The stops 27, 28, 29 for controlling the feed are respectively four, one, and two units thick and are secured to bladesprings 25 on rocking frames 16, 17, 18 pivoted at 19, 20, 21 and formed with cross-bars 13, 14, 15 arranged opposite projections 12 on bars 9 which are fulcrumed at 10 and are carried by the bars 8, there being a pair of bars 8, 9 for each type-lever, and the bars 9 being provided with none, one, two, or three projections depending on the thickness of the type on the associated type-lever. The stops are arranged between a fixed guide 72 and a guide 73 on the lever 56 and are movable by the frames 16, 17, 18 into the space between the lug 58 and the stop 59, this movement being equal to half the depth of the stops so that the stops always remain in contact and cannot become entangled. When the stop 27, or the stops 27, 28 are used, the stops 28, 29 or the stop 29 yield laterally. In operation, on depressing the keys, the frame 35 moves forward, the pin 39 releasing the pawl 41 from the escapement-wheel 42 and the pin 38 permitting the pawl 40 to engage the escapement-wheel, the pawl 40 then moving to the right until the stop 59 engages the stop 64. When none of the stops are interposed, the maximum feed of ten units is effected, but when one or more of the stops are interposed the feed is shortened by an amount proportional to the combined thickness of the stops. Thus in the case of a bar 9 provided with an upper and a lower projection 12, the stops 27, 29 would be interposed and the feed would be shortened by six units, or in the case of a bar provided with three projections 12 the feed would be shortened by seven units. The stop 27 is formed with a recess 27<a> so that when the stops 27, 29 are used, the stop 27 can bear on the stop 29 without interference by the stop 28. When the universal bar 32 is moved to the rear, a pivoted catch 68 thereon snaps under an arm 70 on the lever 60 and prevents the return of the universal bar until the arm 70 is retracted by the movement of the lever 60. The pawls 40, 41 may be each replaced by two or more pawls, the teeth 47, 47<a>, and 48, 48<a> of which are separated by a distance equal to an uneven multiple of half the pitch of the teeth of the escapement-wheel 42. For operations such as setting spaced matter in type-setting and stripperforating machines, a device of the following character is provided for increasing the feed. The pawl 41 is mounted by a slot 76 on the pivot 49 and engages by a tail 77 with a pivoted stop 78 which can be turned by a handle 80 to present a recess 81 to the tail, thereby permitting a further feed of the carriage after the pawl 40 has been disengaged from the escapement-wheel.