Patent GB-191302206-A (GB)
Title: Improvements in Sheet Position Indicating Attachments for Typewriting Machines.
Inventor: NEIDIG WILLIAM JONATHAN
IPC: B41J29/48
Filed: 1913-01-27
Granted: 1913-11-20
Abstract: 2206. Neidig, W. J. Jan. 27. Margin stops; alarms; locking-devices.-Relates to improvements in the bottom-margin indicators described in Specification 2205/13, and comprises the provision of a weight or spring for restoring the index or scale to the normal position. In the apparatus shown in Fig. 1, the scale-drum 15 is journaled on a lever 12 and is provided with a balance weight 17 and with a pinion 16, which is normally separated from a pinion 8 on the platen by the engagement of a feeler 13 on the lever with the sheet a. When the rear edge of the sheet has passed the feeler, the feeler can enter a slot 5<a> in the paper-shelf and permit the drum to be driven by the engagement of the gears 8, 16. In a modification, the feeler is adapted to enter a circumferential slot in the platen, and is jointed to facilitate backing up of the sheet. When the sheet is inserted, the feeler lifts and disengages the gears 8, 16, the scale-drum being then returned to normal position by the balance weight 17. The scale is read by a pointer 18 on the lever 12, some of the indexes on the scale being coloured to give a visual signal. The scale-drum carries adjustable tappets 20, 21 respectively adapted when the gears 8, 16 are in engagement to operate a bell hammer 22 and a lever 27 for locking the platen against rotation. In the apparatus shown in Figs. 5 and 6 the platen is provided at the end with a circumferential series of plunger-feelers 13<c>, which are pressed outwards by springs 36 and are formed with fingers 13<x> adapted to engage a lug 39 on the scale-drum 15<c>, which is loose on the platen-spindle and is provided with a balance weight 17<c>. The fingers 13<x> are adapted to engage a fixed internal cam 37 arranged to retract the plungers flush with the platen over approximately half the circumference on the papershelf side of the platen. When the sheet has been fully inserted, the fingers 13<x> are clear of the lug 39, all the plungers being held in retracted position either by the cam or by the sheet. When the rear edge of the sheet has passed the lug, the feelers near the lug are released and the nearest finger 13<x> engages the lug and drives the scale-drum with the platen. The scale-pointer 18<c> is preferably slotted and the scale is of lighter tint than the rest of the scale-drum. The scale-drum carries a pin 40 adjustable in holes 40<x> and adapted to operate a lever 41 carrying a bell-hammer 42, and also adapted to operate a lever 44 connected by a link 45 to a locking-bar 46 arranged to prevent further printing by obstructing the type-levers. In a modification the scale is carried by a sliding rack gearing with a pinion adapted to be operated by the plunger-feelers, the rack being restored to normal position by gravity. In the apparatus shown in Figs. 13 and 15, the scale-drum 15<e> is returned to the normal position by a coiled spring, and the sheet-feeler which controls the drum is operated hy the leading edge of the sheet. The drum is loose on the platen-spindle and is frictionally engaged by a split ring 51 connected to a coiled spring 17<e>, which is anchored to a fixed pin 52. The feeler consists of a disk 13<e> engaging a circumferential groove in the platen, the disk being mounted on a lever 58 carrying pinions 60, 61 adapted respectively to engage pinions 62, 63 on the platen and the drum. When the leading edge of the sheet engages the feeler, it is lifted and moves the pinions 60, 61 into gear with the pinions 62, 63, the drum being thereby driven with the platen. When the sheet is removed from the machine, the feeler enters the groove and disengages the pinions, the drum thus released being returned to normal position by the spring 17<e>. The friction-connexion 51 prevents over-winding of the spring. The drum is arrested in normal position by the engagement of a pin 54 with a detent 53. Adjustable pins 40<e>, 63<a> on the drum operate respectively a bell-hammer 42<e> and a lever 64 for locking the platen against rotation by means of an arm 65, which is normally held out of gear by a weight 67. The lock can be released by a lever 68. In the apparatus shown in Fig. 17, the scale-drum 15<f> is driven by a connexion from the line-space lever 69 and is controlled by a sheetfeeler 13<f>. The drum is loose on the platenspindle and is provided with a helical spring (not shown) for restoring it to the normal position determined by the engagement of a pin 71 on the drum with a stop 72, the pin being placed in one of the three holes 71<a> according as to whether the spacing is single, double, or treble line. The drum is provided with a ratchet 70 engaged by a weighted detent 85 and a pawl 80 which is pivoted to the arm 78 of a rock-shaft 75 coupled by a link 77 to the line-space-lever, the pawl being formed with a slotted tail engaging the arm 83 of a loose sleeve to which the feeler 13f is secured. The operation of the line-space lever normally causes the pawl to advance the drum until the feeler is arrested by the sheet, whereupon the pawl is swung outwards by the slotted connexion 83 and releases the detent 85 to permit the drum to be returned to normal position determined by the pin 71. When the rear edge of the sheet has passed the feeler, it can enter a slot 13<x> and thereby permit the pawl to make a full stroke to advance the drum with the platen, the detent holding the drum after each stepadvance. A pin 87 adjustable in holes in the drum operates an alarm and a keyboard-locking bail 101 by engaging a lever 88 coupled by a link 90 to a bail 91 extending across the carriage and engaging a lever 93 pivoted to the frame and coupled by a link 96 to a lever 98 carrying the bell-hammer 99 and the locking-bail 101. The lock can be released by lifting the link 90 to permit the connecting-pin 104 to pass into an horizontal part of the slot 103, and thereby allowing a spring 105 to release the bail 101.