Patent GB-191302205-A (GB)
Title: Improvements in Sheet Position Indicating Attachments for Typewriting Machines.
Inventor: NEIDIG WILLIAM JONATHAN
IPC: B41J29/44
Filed: 1913-01-27
Granted: 1913-10-30
Abstract: 2205. Neidig, W. J. Jan. 27. Margin stops; alarms; locking-devices.-In bottom-margin indicators, an index or scale is adapted to be driven from or with the platen when permitted by the tripping of a sheetfeeler by the top edge, or in a modification shown in Fig. 31 by the bottom edge of the sheet. The index may be arranged to operate keyboard-locking and alarm mechanism. The index is generally driven from the platen and is retained by a detent controlled by a feeler adapted on the passage of the edge of the sheet to enter a slot in the paper apron. The feeler is preferably pressed against the sheet by the movement of the platen, a counterweight or spring being provided in some cases to reduce the pressure. The index preferably consists of a scale arranged to show the line-spaces remaining on the sheet ; or in the arrangement shown in Fig. 26 the index controls electric contacts for successively illuminating numbers. The mechanisms described below are all arranged to permit of backward rotation of the platen, and the feeler may be adapted to yield when the rear edge of the sheet after passing the feeler is backed up against it in manipulating the sheet. In the apparatus shown in Fig. 1, the scale is formed on a light annulus 4 which is journaled on a collar 6 on the platen and is engaged frictionally by lugs 7 on the collar. The annulus is provided with an arm 9 having a rigid lateral feeler 10 which engages the sheet a and holds the scale stationary until the rear edge of the sheet has uncovered a slot 12, whereupon the feeler enters the slot and permits the scale to rotate and bring its graduations successively under a pointer. For use with cards and short sheets, the scale may be provided with duplicate series of graduations and may carry a second feeler 10<a>. In the apparatus shown in Fig. 5, the scale-drum 4<a> is journaled to the rear of the platen on a pin 15 and is engaged frictionally by a pinion 17 gearing with the platen and pressed against the drum by a spring 18 adjustable by a screw 19. The feeler 10<a> is pivoted on a yoke 22 on the drum, the pivot 21 being eccentric to the pin 15. The feeler presses rearwardly against the sheet and can enter a slot in the paper apron. The feeler swings idly when the rear edge of the sheet is backed up against it. In the apparatus shown in Fig. 6, the scale-drum 4<b> is pressed frictionally against the platen by a dished spring 25 adjustable by a collar 27. The feeler 10<b> is secured to a rotatable sleeve 33 provided with a counterweight 34 for reducing the pressure of the feeder. The scale-drum is provided with a pin 36 engaging a detent-lever 35, which bears on a pin 34<a> on the counterweight and presses the feeler against the sheet, the scale-drum being thereby held stationary until the rear edge of the sheet permits the feeler to enter a slot 12<b> in the paper apron. The counterweight may be adjustably mounted. The feeler is pivoted at 37 and formed with a tail engaging a pin 39, the arrangement permitting the feeler to turn idly when the rear edge of the sheet is backed up against it. The scale is read by a pointer 13<b> formed with a slot of the same length as the scale, this being coloured to attract attention. The scale may consist of a light ring of cardboard mounted with slight friction in a troughed drum, a duplicate arrangement of projections 36 and levers 35 being provided to prevent twisting of the ring. In the apparatus shown in Fig. 11, the feeler 10<c> is journaled in brackets 41 and formed with a detent or cam 35<c> engaging a pin 36<c> on the frictionallydriven scale-drum 4<c>, a spring 34<c> being provided for reducing the pressure of the feeler. In the apparatus shown in Fig. 14, the frictional connexion between the scale-drum 4<e> and the platen consists of a band embracing a hub on the platen and secured at the ends to a lever pivoted to the drum. A pin 49 on the lever engages a detent 35<e>, which is supported by a rail 53 and is pivoted at 52 to a weight 34<e> carrying a feeler 10<e> operating as described with reference to Fig. 6. The scale-drum also operates keyboard-locking and alarm-mechanism, the drum being provided with a pin 55, adjustable in holes 54 and adapted to engage a lever 56 connected by a link 58 to a pair of levers 60 provided with a cross-bar 62 which engages in all positions of the carriage with a lever 64 arranged at the middle of the machine. The lever 64 is coupled by a link 66 to levers 72 provided with a bell-hammer 70 and a bar 73 for engagement with lugs 74 on the key-levers. The lock can be released at any time by lifting the link 58 so that the connecting- pin 59 can pass into a slot 58<a> and permit a spring 76 to retract the bail 73. The lock is released automatically when the pin 55 has passed the lever 56. In the apparatus shown in Fig. 22, the scaledrum 4f is adapted to be positively coupled to the platen, and for this purpose carries a toothed lever 78 adapted to engage a pinion 77 on the platen but normally held clear by the engagement of the feeler 10<g> with the sheet. When the rear edge of the sheet releases the feeler, a spring 79 causes the lever to engage the pinion. This coupling- device may be used with the feeler-arrangement described with reference to Fig. 6. In the apparatus shown in Fig. 23, the scale-drum 4<g> is coupled frictionally to the platen and is also provided with a pinion 83 having a mutilated part normally opposite a pinion 85 on the same shaft 84 as a pinion gearing with the platen. When the feeler 10<g> is released, the drum is driven frictionally through a short arc and is then positively driven by the engagement of the pinions 83, 85. A pin 55<a> on the drum operates a bell-hammer 87 and a bail 90 which locks the keyboard by engaging lugs 91 on the action-links 92. In a modification of this form of apparatus, the scale-drum is arranged behind the platen and provided with a mutilated gear and with a peripheral friction ring engaging a friction ring on the platen. In the apparatus shown in Fig. 26, the feeler is pressed against the sheet by a direct connexion from the platen instead of using the scale-drum to press the feeler against the sheet as in the forms of apparatus described above ; further, the scale-drum may be arranged to control the electric indicator shown. The feeler 10<h> is secured to a rotatable sleeve 33<h> provided with a segment 102 gearing with a segment 103 on an arm, which embraces frictionally the platenspindle 5 and is gripped by a spring 104 adjustable by means of bolt. The scale-drum 4<h> is frictionally coupled to the platen by a split ring 100, which engages the rim of a disk 99 on the platen and is secured to a pin 101 on the drum. The drum is normally detained by a detent 35<h> which is secured to the sleeve 33<h> and engages the pin 101. The frictional engagement of the segment-arm 103 with the platen-spindle serves to press the feeler against the sheet, the detent being released when the rear edge of the sheet has passed the feeler. Backward rotation of the platen carries the feeler away from the sheet and releases the detent from the pin 101. The drum carries a contact 104<a> adapted to wipe E over contacts 105 each in the circuit of one of a number of lamps 106 arranged under a perforated index-plate 107. Some of the lamps may be coloured. In the apparatus shown in Fig. 30, the feeler 10 is pressed against the sheet by a yielding connexion from the line-space lever 111, the connexion consisting of a spring 116 surrounding a link 113 which can pass through a hole 114 in a lug secured to the shaft 115 which carries the feeler. The frictionally-driven scale-drum 4<i> is normally detained by a detent 35<i> which engages a lug 110 and is loose on the shaft 115. Normally the presence of the sheet limits the stroke of the feeler, but when the rear edge of the sheet has uncovered a slot in the paper apron the stroke of the feeler increases and a pin 117 on the shaft 115 engages the tail of the detent and releases it from the lug 110. In the apparatus shown in Fig. 31, the scaledrum is released by the engagement of the leading edge of the sheet with a feeler 10<k>, the scale-drum preferably showing the distance from the printing point to the leading edge of the sheet. The scaledrum is frictionally connected to the platen and carries a planet pinion 123 engaging a fixed annular gear 124 and a pinion 120 on the platen-spindle 5, the gear 124 normally presenting a mutilated part to the pinion 123. The drum is engaged by a detent 125 formed on a lever 126 pivoted on a pin 31<k>. The weighted feeler 10<k> is pivoted on the pin 31<k> and provided with a tail 127 carrying a lever 128 provided with a pin 131 engaging a slot 132 in the tail of the lever 126. When the leading edge of the sheet engages the feeler, it is lifted out of a slot in a table 134 and the tail 127 is depressed, thereby causing the tip of the lever 128 to engage a toothed rim 136 on the platen. The further rotation of the platen swings the lever 128 and through the pin-and-slot connexion 131, 132 lifts the detent 125 out of the scale-drum, which is thereupon enabled to rotate with the platen, initially by the friction connexion and subsequently by the planet-gearing 123. During the rotation of the drum, a cam incline 137 rocks the lever 126 and swings the lever 128 clear of the toothed rim 136, the lever 128 being provided with a pin 129 which can engage a lug 130 on tha tail 127 and raise the feeler above the sheet.