US1916905A - Margin regulator for typewriters - Google Patents

Description

July 4, 1933.

W. WOODFINE MARGIN REGULATOR FOR TYPEWRITERS Filed Nov. 21, 1932 Patented July 4, 1933 PATENT OFFICE if, WQODFINE, OI VERDUN NEAR MONTREAL, QUEBEC, CANADA.

HABGIN REGULATOR FOR TYPEWBITERS Application filed November 21, 1932. Serial No. 643,570.

The present invention relates to improvements in margin regulator mechanism to typewriters and the like.

An important obj eot of the invention 1s the provision of margin regulator means for typewriters designed so that themargin stops may be automatically shifted upon manual operation of control elements.

A further object of the invention 1s the in provision of margin regulator means f or typewriters designed so that rearwarly disposed margin stops may be caused to assume positions in correspondence with a selected setting of the carriage through the medium of forwardly projecting control keys.

Another object of the invention is the provision of margin regulator means for typewriters constructed so that the margin stops will be automatically shifted in conformity with the position of the carriage upon manual operation of control elements.

Still another object of the invent1on 1s the provision of margin regulator mechanism of the above character which will be relatwely simple in construction and eficient 1n operation.

A still further object of the invention is the provision of margin regulator mechanism of the above character which may be operatirely associated with certain types of typewriting machines now in use.

(Ether objects and advantages of the invention will become apparent as the description progresses.

in the accompanying drawing forming a part of this specification and in wh1ch l ke reference characters are employed to designate corresponding parts throughout the 4G SEJHE, a

Figure 1 is a front perspectwe view oi the assembled margin regulator mechanism Figure 2 i a transverse section taken on the line 22 of Figure 1,

Figure 3 is a similar section taken on the line 3--3 of Figure 1,

Figure t is a top plan View of the margin stop tripping mechanism,

Figure'fi is a top plan view of the margin 5e stops and stop supporting rack,

Figure 6 is a side elevational view of one of the margin stops,

Figure 7 is a fragmentary bottom plan View of the same in one position,

Figure 8 is a similar view showing the stop in another position, and

Figure 9 is a transverse section through a stop actuating roller.

Referring to the drawing, wherein for the purpose of illustration is shown a pre ferred embodiment of the invention, the numeral 15 designates a pair of support arms projecting rearwardly from the carriage frame of a typewriter. Attached to the arms and extending therebetween is a rack bar 16 55 provided at the upper face with rack teeth 17. A fixed stop post 18 projects upwardly from the main typewriter frame at a position spaced rearwardly of the rack bar 16. Slidably fitted on the rack bar 16 and adapted to be actuated longitudinally thereon are a pair of complementary margin stop instrumentalities A and B. The margin stop A embodies a channel shaped body 20 slidably disposed on the rack bar and having pivotally connected thereto a vertically oscillating catch member 21 provided at one end with a rack tooth engaging detent 22. At the opposed end of the catch 21 is formed an upwardly projecting lip 23. Secured to the catch and extending longitudinally at one side of the stop body is a side plate 24 having attached to and extending laterally from the lower rear portion a pin 25. Slidably supported in the lower portion of the body 20, below the rack bar, is a longitudinally movable bar 27 normally urged to an inward position against a stop piece through the medium of a coiled tension spring 28. One end of the spring 28 is fastened to the outer end of the bar while the opposed end is connected to the inner extremity of the body. Formed integral with and projecting laterally from the bar 27 is a lug 29 projecting so as to contact with the stop post 18. Attached to the body 20 and projecting laterally thereof is a bracket 30 carrying a set screw adjustable'longitudinally relative to the lug 29.

The complementary margin stop B embodies a channel shaped body 31 slidably mounted on the rack bar provided with a similar oscillatory catch member 32 pivotally connected with the body and having a side plate 33 attached thereto. The catch 32 is provided, at the outer end, with a rack engaging detent 34 and, at the mner end, with an upwardly projecting contact 11p 35. Attached to one side of the body 31 and pro ectin laterally thereof is a bracket 31 carrymg a set screw 32' engageablewith the stop post 18.

Connected to the side plate 33 and pro ecting laterally therefrom .is a pin 36 supporting concentrically thereon an exter orly grooved roller drum 37 Between the pm 36. and the periphery of the drum 1s disposed a spiral spring 38 aving one end fastened to the drum and the opposed end secured to the pin so that the drum may be rotated about the pin against or by the tension of the spring. One end of a cord 40 is attached to the drum and a portion of the cord wound upon the grooved periphery thereof. The opposed end of the cord is connected with a coiled tension spring 41 which, in turn, connects with the looped end of a link 42 pivotally connected with the pin 25. The pins 25 and 36 are disposed below the pivot points of the catch members carried by each margin stop and, before connecting, the cord, spring and link, the drum 37 is rotated to a position under tension by the spring 38 so that this connection tends to adjust the trip members to a position wherein the detents 22 and 34 will engage the rack bar and at the same time exerts a tension tending to actuate the stops toward the sto post 18.

upported so as to extend longitudinally above the lips of the respective stop members are a pair of trip bars 44 and 45, each of said trip bars being formed with rearwardly directed levers 46 at the ends pivotally connected with pivot pins 47 supported in brackets 48 attached to the rear end of the arms 15. Upward swinging movement of the trip bars 44 and is restricted b means of lugs 49 formed on the upper en of a stop bracket 50. The trip arms are resiliently urged to an elevated position a ainst the stop lugs by means of springs 51 nt about one of the pivot pins 47 engaging one lever of each trip bar and bent over the end of the rack bar 16.

To one rearwardly directed lever of each trip member is connected 9. key bar 53 bent in approximately U-shaped form at the rear end, and attached to the trip members at opposite extremities. The key bar 53 embodies a transverse forwardly projecting lever 54 having a finger actuating key 55 disposed on the front end. Thus, the key structure for each trip device will extend so as to be conveniently operable from a position at the front of the machine.

The mechanism operates as follows:

When the longitudinally movable carriage is adjusted to a predetermined position corresponding to the desired left hand marginal setting, the key at the left hand side of the margin re lator is depressed, causing a lowering of t e longitudinal trip bar 44 which engages and depresses the lip 23 of the margin stop A. This operation will detach the detent of the catch 21 from the rack and release the stop so that it will be automatically shiftedthrough the action of the spring roller against the stop post 18. Upon each subsequent shifting of the carriage from left to right, a corresponding marginal setting will be effected. To release the margin stop thereafter, it is merely necessary to depress the left hand key and shift the carriage, thereby enabling reduction of the margin at the left side of the typing sheet.

In order to rovide suitable clearance and to obviate bin ing during initial typin action of the left marginal setting, it wi 1 be noted that the lug 29 will initially contact with the stop post 18 thereby providing a resilient buffer through the medium of the spring 28 and a proper setting of the stop.

By similar operation of the opposed control key, the stop B may be correspondingly actuated in order to dispose the right hand margin stop at a pre-selected setting of the carriage.

Thus, the present construction will enable disposal of the margin stops at the rear of the carriage frame to afford unobstructed visibility atthe front of the machine and will enable adjustment of the margin stops through the medium of keys disposed at conveniently accessible positions at the front of the typewriter. Furthermore, the present mechanism will enable rapid and convenient adjustment of the margin stops without the necessity of lifting the paper table and manually shifting these stops. 4

The machine illustrated in the attached drawings is representative of a type having a fixed stop secured to the frame and movable margin stops supported by the carriage. The Royal typewriter, and others, use this arrangement.

Therefore, it is evident to any one conversant with the typewriter art that both arrangements can be used in the present instance, with equal results, and that it is unnecessary, nor desirable, to illustrate all the existing machines having one or the other arrangement.

Having thus described my invention, I claim:

1. In margin regulator mechanism the combination with a typewriter including a movablev carriage and a fixed stop post, of a rack bar mounted on the carriage, a pair of stops disposed for longitudinal sliding movement on the rack bar, an oscillatory catch member mounted on each stop, means attached to the stops adapted to releasably adjust the catch members to a stop securing position and tending to slide the stops in one direction on the rack bar, movable trip'memhers operable to trip the catch members and release the margin stops, and operating keys attached to the said trip members whereby the latter may be actuated from a remote po-' sition.

2. In margin regulator mechanism the combination with a typewriter: including a movable carriage and a fixed stop post, of a rack bar mounted on the carriage, a pair of stops disposed for longitudinal sliding movement on the rack bar, an oscillatory catch member mounted on each stop, means attached to the stops adapted to releasably adjust the catch members to a stop securing position and tending to slide the stops in opposite directions on the rack bar a air of oscillatory trip bars engageable with t e catch members, means normally retainin g the trip bars in elevated non-tripping position, and keys attached to each trip bar and extending therefrom whereby the trip bars may be actuated to a stop releasing position from a remote operating position.

3. In a margin regulator for typewriters the combination with "a stop post, a carriage movable with respect to the stop post, a rack bar mounted on the carriage, a pair of stops slidable on the rack bar, and rack engaging catch members attached to each stop to normally secure the stops in set position on the rack bars, of spring mechanism tending to slide the stops toward one another, a pair of trip members operable to adjust the catch members to stop releasing positions, and extension keys attached to the shift members for actuating the latter from forwardly disposed positions.

4. In a margin regulator for typewriters the combination with a stop post, a carriage movable with respect to the stop post, a rack bar mounted on the carriage, a pair of stops slidable on the rack bar, and rack engaging catch members attached to each stop to normally secure the stops in set position on the rack bars, of spring mechanlsm tending to slide the sto s toward one another, a pair of trip mem ers operable to selectively adjust the catch members to stop releasing positions, extension keys attached to the shift members for actuating the latter from forwardly disposed positions, and means carried by one of the margin stops whereby the said stop will make a resilient contact with the stop post.

In witness whereof I have hereunto set my hand.

WELIAM WOODFIN E.

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