Patent GB-190619721-A (GB)
Title: Improvements in Type-writing Machines
Inventor: HOLFORD JOHN CARBURY
Filed: 1906-09-04
Granted: 1907-09-04
Abstract: 19,721. Holford, J. C., [Alexander, J.]. Sept. 4. Typewriters.- The frame of the machine consists of two side plates 1, a front bar 3, and a back plate 4. A removable top - plate 5 supports the carriage and a centre plate 6 carries the typebars, the heads of which are supported by a front plate 7. The side plates 14 of the carriage are connected at the rear by a sleeve 15 sliding on a rod 12, and at the front by a bar 16 carrying a roller which runs on a track 13. The platen shaft 19 turns in side plates 20 connected by bars 21, 22, and is guided vertically in slots in the plates 14. The platen is provided with guide-plates for the paper and with spring- pressed pressure-rolls which can be retracted by means of a finger-lever. A pair of guide-fingers, one of which is adjustable, are mounted on the rod 22. The platen is rotated for line-spacing by a ratchet-wheel and a pawl which engages an adjustable stop for varying the spacing. The keylevers 44 are pivoted to a plate 8 and are pressed upwards by tongues on a removable spring-plate 52. Intermediate levers 46 pivoted on the plate 8 are connected by pins and slots with the key-levers and, preferably by means of rollers, with slots in the type-bars 49. Rollers 53 mounted on the plate 6 serve to aline the type-bars at the printing point. A universal bar 56 carried by arms on a shaft 58 is engaged by shoulders 57 on the typebars. An arm 60 on the shaft 58 has a slotted extension 62 which engages a pin on a lever 63 connected to the ribbon-guide 55. The ribbonspools 65 are removably held on their shafts by spring plates 70. The lower flange 72 of each spool is formed with ratchet-teeth which are engaged by a detent 52 and a feed-pawl 78. The pawls 78 are carried by arms on a shaft 74 which is rocked by the universal bar. The feed of the ribbon is reversed by a hand-operated slide. The weight of the platen is partly balanced by arms 97 on a shaft 96 which is rotated by a spring. The platen is moved to the upper-case position by means of a shift-rail 88 on which runs a roller 87 carried by the bar 22. The platen may be raised by either of two key-levers which are connected by links 95 with arms 91 on a shaft 90. One of the arms 91 acts directly on the frame of the shift-rail 88 and the other acts through a loosely-pivoted member 93. When one of the key-levers is depressed, the platen is raised and an arm 104 passes beneath the member 93 and holds the platen in the upper position. Depression of the second key-lever rocks the shaft 90, and causes a pin 105 on the arm 91 to push back the arm 104 and permit the platen to fall. The lever 63, which actuates the ribbon vibrator, is pivoted to a projection on the shiftrail 88 so that the ribbon rises and falls with the platen. The carriage is driven by a spring drum carried by the top plate 5, and is controlled by a rack 109 and dogs 110, 111 carried by an arm 60 on the shaft 58. Spacing can be effected independently of the key-levers by means of a space-bar connected with an arm on the shaft 58. The rack 109 is carried by a pivoted frame and can be tilted to release the carriage by means of a handle. The rack can also be tilted by an arm on a shaft which is rocked by a special key-lever. A second arm on the same shaft is, at the same time, moved into the path of a stop or stops adjustably mounted on a rack-bar on the carriage, which can thus be arrested at any desired point. The bell-striker is actuated by a shoulder on an adjustable paper guide-finger mounted on the bar 22. At the end of a line, the guide-finger rocks an arm into the path of the universal bar 56 and locks the keyboard.