US1055480A - Type-writing machine. - Google Patents

Description

P. I. MAIN.

TYPE WRITING MACHINE. 122111011 1011 211.211 r1113. 25, 1911.

Patented Mar. 11,1913..

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F. F. MAIN.

- TYPE WRITING MACHINE.

APPLICATION FILED 1'33. 25, 1911.

1,055,480. I Patented Mar. 11,1913.

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FRED IE. MAIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN T. UNDERWOOD, F

BROOKLYN, NEW YORK.

TYPE-WRITING MACHINE.

Application filed February 25, 1911. Serial-No. 610,716.

I '0 all whom it. may concern:

Be it known that I, FRED F. MAIN, a citizen of the United States, residing in Chicage, in the county of Cook and State of Illinois, have invented certain newand useful Improvements in Type-Writing Machines, of which the following is a specification. V

This invention relates to means for returning the carriage of a typewriting machine, to begin a new line of writing.

The object of the invention is to provide simple and efficient means for this purpose, and for automatically line-spacing the paper. 7

I connect to the carriage the piston of a pneumatic cylinder, and I provide a fingerpiece or key for opening the valve to admit air to said'cylinder and to operate the piston and return the carriage; the air pressure being continued as long as said key remains depressed. An improved connection is made between the piston rod and the line-spacing mechanism of the typewriter for turning the platen when the carriage is run back.

In the accompanying drawings, Figure 1 is a side elevation of an Underwood front strike writing machine provided with the present improvements Fig. 2 is a sectional view of a three-way valve connected to the pneumatic cylinder, and showing the valve closed against admission of compressed air. Fig. 3 is a similar view showing the valve open. F i 4 is a perspective view showing the front eft hand corner of the paper carriage and a part of the automatic platen rotating means. Fig. 5 is a rear View of the machine, and Fig. 6is an elevation illustrating the method of operating the linespacing lever.

As usual in said machine, key levers I operate bell cranks 2 to throw type bars 3 up to strike a platen 4, which is mounted on a carriage 5. This carriage is driven by I a spring-barrel 6, and controlled by escapeboard and extends'upwardly from a rock shaft 10, which extends horizontally back, and at its rear end is provided with an up- .ratchet secured to the platen 4.

depression of said key 9 therefore, the arm standing rock arm 11, this being swung to the right at Fig. 5 when the key 9 is de-.

pressed. To the upper end of said rock-arm 11 is connected a link 12, the other end of which is attached to an arm 13 fixed to a three-way valve 14:. When said key is depressed, as aforesaid, the arm 13 is thrust from the position at'Fig. 2 to that at Fig. 3, and a central perforation or passage in said valve is opened to admit air through an inlet or pipe 16, which is connected to any source of supply 17 of compressed air, The air is thus admitted to a cylinder 18, in which plays a piston 19 having a rod 20, which at Fig. 5 projects to the left from said cylinder 18,- and is attached by means of a nut 21 and eye 22 to a rod 23, which extends back along the cylinder 18 and is connected to the carriage'5 of the typewriter to move the same to the leftat Fig. 5,.which isa rear View; such movement to the left throwing the carriage back to the beginning of a new line. l

The rod 23 is not connected directly tothe carriage, but to the line-spacing devices so that the latter are automatically operated by the piston 19. These connections include a rock-arm 24: extending upwardly from a horizontal rock shaft 25, which extends from the rear to the front of the carriage, and at its forward end carries an upright rock-arm 26, to engage a lever 27 fulcrumed at 28 on I the carriage 5, and constituting the usual linespacing lever of said Underwood typewr1ting machine, said lever being adapted to drive a pawl 29 which meshes with a At the 11 is rocked and the valve 14 is opened, the air is admitted to the cylinder, and the pis- Specification of Letters Patent. Patented li iar. 111, 1913.

ton is thrust back and by means of the rod 23 rocks the rock shaft 25 and the arm 26,

and swings the lever 27 to turn the ratchet 30 and platen a. Pressure upon the piston 19 is sufficient not only to rock the linespace lever and turn the platen, but also to thrust the entire carriage to the left as far as it will go at Fig. 5, so that the same is brought to position to begin-a new line

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