US895891A - Printing-point indicator for type-writers. - Google Patents

Description

No. 895,891. PATENTED AUG, 11, 1908. G. PERSSON.

PRINTING POINT INDIUATOR FOR TYPE WRITER SQ APPLICATION FILED JAN. 23. 1908.

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G'USTAF PERSSON, OF WOODSTOCK, ILLINOKS, ASSIGNOR TO THE OLIVER TYPEWRIIER COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PEZNTZNSMPOZN' KNDICATGB FOR TYPE-WRITERS.

rim-895,891.

Specification of Letters Patent.

Patented Au 11, 1908.

Continuation of application Serial No. 344,938, filed November 2%, 1906. This application filed January 23, 1908.

. Serial No. 412,252.

To all whom it may concern:

Be it known that I, GUSTAF lnnsson, a citizen of the United States, and a resident of Woodstock, in the county of McHenry and 5 State of Illinois, have invented certain new and useful Improvements in Printing-Point l'ndicatorsfor Type-Writers; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being it had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to an improved printing point indicator adapted for a plication to typewriting machines of the c ass in which the printing oint on the paper is visible to the o orator uring the printing operation, and w ich embraces an index or pointer which has oscillatory movement by which it iscarried away from said printing point and out of the path of the tyne when the ty sbars are advanced toward the paper, 21111 is restored to its position for indicating the striking point of the type when the type-bars I are retracted.

The invention consists in the matters hereinsfter described and pointed out in the appended v claims.

The, "nvention is shown in the accompanying drawings as applied to a typewriter of the kind known as the Oliver but the features constituting it may he applied to typewriting machines of other forms.

In the drawings :Figure 1 is a View showing in central vertical section the platen and adjacent principal parts of an Oliver type- I Writing machine equipped with my improvement. Fig. 2 is a view in rear elevation of the lever which carries the pointer or indica- 4Q tor and parts for supporting and actuating the same. Fig. 3 is a plan view of the parts shown in Figs. 1 and .As shown H1 said drawings, A indicates the platen, and B the main longitudinal member or frame bar of the paper-carriage in which the platen is mounted. Said frame-bar B has on its front edge the rack-bar b of the carria e.

5 indicates thehorizontally reciprocating so ribbon-guide constituting art of the ribbonthrow mechanism of an "ver typewriting machine. -Said ribbon-guide has two arms c'c rovided with loops for guiding the ribbon,

an is given reciprocating motion so as to carry the ribbon over the striking point of the types in advance of the type-bars and to retract the ribbon and expose the printed line when the type-bars are retracted.

D indicates the oscillatin escapement lever and l) the escape-wheel, mounted on an upright shaft D which is provided at its up per end with a pinion d, which engages the carriage rack-bar 5. These parts form part of the escape mechailism for controlling the endwise movement of the paper carriage under the action of the carriage ac tuating spring. Said escapement lever D is connected with and receives oscillatory motion from the universal bar of the machine, and is provided with a double pawl d which acts on the escape-wheel D. E indicates the upright connecting bar or link through which motion is transmitted from said escapement lever through the crank to the rock-shaft C by which the ribbongnide C is given movement.

F indicates the supporting arm for the ribhon-guide mechanism. Said arm is located in front of the platen and is attached to and rises from the shift-frame F of the machine, on which the carriage is mounted and has endwise movement.

, So for as described, the devices shown in the accompanying drawings are like those heretofore used on the Oliver typewriting machines. a

N ow referring more particularly to the features constituting the present invention, G indicates an 11 right or vertically arran ed rocking lever w ich is pivotally supported at its'lower end on the rear or inner face of the arm F by means of a horizontal pivot stud 9 so that said lever has an oscillatory movement in a vertical plane parallel with the central axis of the platen. The lever G is Erovided with a horizontally arranged pointer 1 which extends from the top of the lever rearwardly over the top of the platen, with its free end adjacent to the printin line on the paper and is adapted for lateral oscillation by the swin ing of the lever G on its pivot g. The said lever G is provided above the pivot g with a horizontally extending arm G which projects laterally therefrom and is rovided at its end with a weight G Said ever G is also provided at the side thereof at which the arm G is located with a laterally projectii'i shoulder or cam projection having an ob ique edge which is inclined in a -iiiand said stud is adapted for contact with the said cam pro ection 9 when the'rock-shaft C is rotated in a direction to advance the ribb0nguide C toward the laten, thereby moving or shifting laterally t ie upper end of the lever against the action of the weight G and carrying the pointer G away from the printing point and out of the way of the ty e. This position of the pointer is indicated y dotted lines in Fig. 2. When. the stud c withdrawn from contact with the cam g the weight (1: turnsthe lever G to its normal position with the pointer G over the printing point on the platen.

A stop for limiting the movement of the lever G and the pointer under the action of the weight G is rovided by means of a headed stud H which is secured in the rear or inner face of the standard F and passes through a slot g formed in the lever G concentrically with the pivot g thereof. The contact of said pin, or stud with. the ends of the slot limits the sidewise movement of the lever G and retains the pointer G1 accurately in its indicating position when the lever is free from the influence of the stud a.

I claim as my invention 1. In a typewriting machine, the combination with the platen which receives the impressions of the type on its top surface, of an upright indicating lever located at the front rection oblidue to the direction of movement.

platen. and transverse to the central axis of the platen, said lever being rovided at its upper end with a pointer whic extends rearwardly over the platen, and above its pivot with a lateral cam projection, a horizontal rock-shaft arranged parallel with the laten, and having a rigid radial arm adapte to act upon said lateral rojection, means yieldingly holding said ever in position with its pointer in line with the printing point, and means giving oscillatory motion to said rockshaft corresponding to the movements of the universal bar of the machine. I

2. In a typewriting machine, the combination with a )laten, of an upright indicating lever pivote' to swing on a horizontal axis transverse to the central aXis of the platen, said lever being provided above its pivotal axis with a laterally rejecting weighted LtIIIl, and with a lateral earn projection located at the same side thereof as said weighted arm, a horizontal rock-shaft arranged parallel with the platen and having a rigid radial arm adapted to act on said lateral cam projection and means for giving oscillatory motion to said rock-shaft to con cspend with the movements of the universal

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