Patent GB-190808257-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
Filed: 1908-04-14
Granted: 1908-10-22
Abstract: 8257. Fell. J. C., [Yost Writing Machine Co.]. April 14. Typewriters.-Relates to escapement mechanism and to means for supporting and lifting the carriage rack. The type-bar action, comprising key-levers 5, Fig. 1, which raise type-levers 23 from an inking- pad 29 to the platen 30, is of the kind described in Specifications Nos. 4265 and 8746, A.D. 1907. The platen 30 is carried by a frame 114 which is connected by parallel links 115 to the truck 98. The key levers and arms 54 secured to a space-bar 57 are pivoted on a rod 6 and operate a universal bar 31, consisting of a strip of leather secured by rivets in a case secured at each end to an arm 33. A rock-shaft 37, having an arm 39 carrying feed-dogs 40, is formed with arms mounted on pivot pins formed, for purpose of longitudinal adjustment, on a screw tapped into the frame 1. The rock-shaft is secured to one of the arms 33 by studs 35, 35<a>, Fig. 9, which are screwed into arms 36 on the rockshaft and pass respectively through a hole 34<a> and a slot 34<b> formed in a flange 34 on each arm. A projection 38 of the shaft bears on each of the flanges 34 and serves as a fulcrum whereon the arms may be adjusted with regard to the shaft. This construction also enables the universal bar to be disconnected and then replaced in the same position. A spring 46 is attached to a pin 45 on one of the arms, and is secured over a nut 47 mounted on a screw 48, which may be turned by a screwdriver for adjusting the tension of the spring. The screw 48 passes through a plate 50 secured to lugs 52, which form holders for rubber feet 53. The movement of the rock-shaft 37 is limited by a screw top 59 arranged to contact with the arm 39. The dogs 40 co-operate with an escapement-wheel 65 having a hub 68, Fig. 5, mounted on a flanged sleeve 66 secured to a strap 69, which is apertured at 70 to receive a pivot pin 71 formed on a screw 72. The shaft 69 carries a feed-pinion 74 provided with a bearing-sleeve 76 mounted in a bracket 76<a> and between collars 75, 77 secured to the shaft, the bracket 76<a> being secured by screws 122, Fig. 4, to a part 123 secured to lugs 125 on the framework. A ratchet-wheel 79 formed integral with the wheel 65 is provided with teeth 80 engaged by the nose 86 of a pawl 81, which is flattened on one face and pivoted on a screw 82 tapped into a sleeve 83, which is secured to the shaft 69. A spring 88, located in a groove 89 in the sleeve 83, is secured at one end to a pin 90 and at the other to an arm 87 on the pawl. A housing 91 surrounding the ratchet is formed with a hub 92, slotted at 69<a> so as to grip the shaft 69, while permitting the housing to be moved upwards to expose the ratchet. The feedrack 93 is secured at each end by screws 94 to a lever 95 pivoted at 96 to lugs 97 on the truck 98. The pivots 96 each consist of a pin 96 formed with a collar 104 and a screw 105, which is tapped into the lug 97 and secured by a nut 106. The feedrack may be adjusted longitudinally by turning the screws 105. The levers 95 are each formed with arms 102, 125, the arms 125 being held against screw stops 99 by springs 100, which bear against the arms 102 and maintain the rack in engagement with the feed-pinion. The springs 100 each bear against a projection 103, and are secured by screws 101 which serve to adjust the tension of the springs. A lever 107 for lifting the rack is pivoted to the truck and formed with a slot taking over a pin 110 on the truck. The end 112 of the lever engages a projection 113 on the rack. A spring drum 119, mounted in lugs 127 on the part 123, operates a band 120 which is secured at 121 to the end of the truck. The feed-rack is situated beneath the carriage and midway between the bearings, so that the pull of the spring drum is transmitted to the pinion 74 without undue lateral strain on the carriage.