Patent GB-190413263-A (GB)
Title: Improvements in Type-writing and like Machines.
Inventor: CLARK WILLIAM
Filed: 1904-06-11
Granted: 1904-10-27
Abstract: 13,263. Clark, W., [Underwood Typewriter Co.]. June 11. Type-writers are provided with a tabulating- mechanism which is actuated by keys capable of two movements, one of which causes an impression and the other causes a jump of the carriage which is arrested by stops at the required point. The keys are easily detachable from the key-levers and may be replaced by others which operate the typebars only. The type 22 are carried by levers 21, Fig. 1, pivoted on brackets 24 attached to a segment fixed to the frame 26. Each lever is connected by a link 28 with a bell-crank lever 30, a slot in which receives a pin 32 on the key-lever 33. The latter turns on a pin fitting in a recess 34<a> and is pressed forwards by a spring 35 which abuts against a screw 37. A key for actuating the type-levers only, Fig. 11, is provided with arms 40, 42 which engage the lever 33 on opposite sides, and with a lip 41 which engages a recess in the front 33<a> of the lever. The key is further held by a spring latch attached to the lever and carrying a pin 46 which passes through apertures in the lever 33 and arm 40. This key may be replaced by a double-function key, consisting of a member 48, Fig. 7, having a slot 49 in which works the pin 46, and lips 48<c> which embrace the lever 33. The member 48 is pulled forwards by a spring 50 and has, at the front end, lips 48<a> in which slides vertically the shank 52 of the key 53. The shank is further guided by a T-shaped projection 55 on the member 48. The key is provided with a projection 54 to enable it to be pressed backwards, and is held upwards by a spring 56 which bears against a projection 57 on the shank. The key is normally prevented from moving relatively to the key-lever by two projections, one 58 above a lug 60 and the other below a lug 61 on the end of the key-lever, Fig. 11. If the key is depressed while in the position shown in Fig. 1, it actuates a type-lever and, by means of an arm 63, acts on a universal bar 64. If the key is pressed downwards and backwards, the type-lever is not operated, but toes 65, 66 on the shank 52 engage with a release bar 76 and a tabulating-bar 67 respectively. The bar 67 is connected with a pivoted lever 70, to which is attached a bar 71 carrying a stepped stop 72. The toes 66 are of different length so that the stop may be raised two, three, or more steps as required. Suitable indications may be placed near each key or on the projections 54. By means of a special tabulating-key, the stop may be raised one step only. The release bar 76 is carried by pivoted arms 77 connected by a cross-bar 78 and is also engaged by projections on the tabulating key, which therefore moves down when the bar 76 is depressed by any other key. The tabulating-key is connected by a pivoted lever with a link 82, Fig. 3<a>, which is attached to a lever 84 which has a pin-and-slot connection 86 with a brake and release bar 87. This bar is pulled up by a spring 88 and carries a member 89 which can depress the feed-dogs 90, 91 out of engagement with the rack 92, allowing the carriage to be propelled by its spring. The bar 87 carries a spring 93 and a pad 94 which press on the rack-bar and act as a brake. Instead of a stepped stop, an ordinary stop 95 may be used. This is connected with a pivoted lever 96 having a loose connection 98 with an arm 99 on the lever 84. The stop 72 or 95 is normally depressed by a spring-actuated arm 100 which acts on a pin 95<a>. When raised, it is engaged by a second stop, Fig. 5, which has a sleeve 104 sliding on a bar 103 fixed to the carriage. A spring 110 presses the part 107 of the stop into engagement with a rack 102 fixed to the carriage and presses a projection 105 down on to the rackbar. A pointer 108 fixed to the stop moves over a scale 109. A pivoted piece 111 is held by a spring 113 in the path of the stop 72 or 95, and may be held out of action by a spring latch 115. Two or more stops may be placed on the bar, which is made in two parts, one being fixed to the carriage and the other screwing into it. To prevent the key-levers from being depressed when the tabulating-mechanism is operated, the key is pressed backwards so that the member 48 is moved back against the action of the spring 50. When the key is depressed, the inner lip 48<a> is caught by the edges of a slotted plate in which the keylevers move. At the same time, the projection 58 on the shank 52 escapes from the lug 60, and allows the key to be depressed relatively to the key-lever 33. When the key is released, it is raised by the spring 56, and is carried forwards by the spring 50.