US909539A - Carriage-return mechanism for type-writers. - Google Patents

Description

E. A. BURLINGAME. CARRIAGE RETURN MECHANISM FOR TYPE WRITERS. APPLICATION FILED MAY 11, 1903.

Patented Jan. 12,1909.'

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6 Hays? E. A. BURLINGAME. CARRIAGE RETURN MECHANISM FOR TYPE WRITERS.

APPLICATION FILED MAY 11. 1908.

Patented Jan. 12, 1909.

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UNITED s r 'r s PATENT OFFICE.

ELMER A. BUR LINGAME, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO BURLINGAME 'lTELEGRAPHING TYPEWRllER COMPANY, A CORPORATION OF WASl-IINGION.

CARRIAGE-RETURN IVIECHANISM FOR TYPE-WRITERS.

Specification of Letters Patent.

Application filed. May 11, 1908. Serial No. 432,229.

Patented Jan. 12, 1909.

To r1 1 w/mm it may concern:

vented certain new and useful Improvements in Carriage-Return Mechanism for Type- \VriteIS, of which the followin 15 a specifica' tion.

My present invention relates to improvements in carriage return mechanism for typewriting machines.

Among the objects of the invention are 'to provide means by which the carriage of manufacture and durable and reliable in use.

The invention includes the features of construction and arrangement and combination of parts hereinafter described and particularly set forth in the appended claims.

One portion of a typewriting machine to illustrate the application of my invention is shown in the accompanying drawings, in which,-

Figure l is a side elevation. Fig. 2 is a front elevation showing the front bar of the carriage only and with the operating cord broken away and the carriage bar and motor brought near together for convenience in illustration. Fig. 3 is a detailed plan View of the motor. Fig. 4 is a view at right angles to Fig. 3. Fig. 5 is a diagrammatic view illustrating the circuits.

Referring by reference characters to these drawings, the letter A designates the carriage of a typewriting machine, B the platen and C the key, the whole being carried by a suitable frame D mounted .upon posts E for providing space between the typewriter proper and the base for the electrical operating parts.

Inorder to effect the return of the carriage at the proper time a cord 1 is connected to the ordinary finger lever 2, which is usually provided in such machines, and which, on the return of the carriage, automatically moves the platen to eifect the line spacing in the manner well understood by those skilled in the art. From the finger lever 2 the cord '1 passes over pulley 3 at the Be it known that T, ELMER A. BURL N; GAME, a citizen of the United States, resids f ing at San Francisco, California, have. in-

upper outer-"hand eorner'of the machine, thence down around the pulley a, journaled in zi -suitable bracket 5, from which point it passes around a pulley (3 journale din a bracket 7 and extends to the drum 8. This drum is journaled in standards 9 and carries a friction' disk 10, which is formed of thin resilient material. The edge of this disk extends between two friction disks 11, 12, one of which is journaled in bearings 13 in the forked end of a lever 14, which is mounted to rockupon a shaft 15. The opposite end of this lever carries an armature 16 designed to co-act with an electro-magnet 17. Normally when the magnet is not energized the armature rests in such position that the disk 11 is drawn away from the friction disk 10. 1V hen in this position the friction disk 10 is adapted to just clear the surface of the friction wheel 12, but when the magnet is energized by the passage of an electric current and the armature l6 thrown towards the same, the friction wheel 11 is swung against the face of the resilient disk 10 forcing it over against the wheel 12.

The friction wheel 12 is carried by the armature shaft of an electric motor 18. The

key G as shown in the drawings is designed in which position it is held by the hooked end of the retaining armature 23. This closes the circuit from the battery 24 through the conductors shown diagrammatically in Fig.4 from the electro-magnet 17, the motor 18 and the magnet 22. The energizing of the magnet 17 attracts the armature 16, as before described, and clamps the edge of the resilient disk 10 between the friction wheels 11 and 12. At the same time the motor 18 is started to rotate the friction wheel 12 and disk 10 and thus rotate the drum to wind up the cord to re turn the carriage to initial position. The magnet 22 being energized holds the armature lever 23 in engagement with the contact spring 21 so that the circuit is kept closed, even though. the key be instantly released after having been depressed. It is necessary of course to break the circuit when the carriage has reached the limit of this return movement, and it is extremely desirable that this break should occur at a certain distance from the limit of the return,

, the engagement of the securing screws being shown merely as an example. On the frame of the machine is located a pivoted lever 27, which hasan inclined end 27 which, as the carriage nears the limit of its return movement comes in contact with the edge or shoulder 26 of the stop 26. This causes the lever 27 to be rocked upon its pivot 28 pulling upward on a rod 29, which lifts the switch lever 30, see Figs. 1 and 4, thus breaking the circuit. As the motor runsalways ata uniform speed, the momentum of the carriage will always be sufficient to cause it to travel until the end of the lever 27 comes in contact with the abutment 26" on the stop when the movement of the carriage will be arrested Without undue shock. When the circuit is thus broken the motor is of course stopped, the magnet 22 deenergized, allowing the armature 23 to be retracted by the spring -23, whereby the electrical connection between the contacts 21 and 22 is broken. \Vh'en this takes place the magnet 17 is of course deenergized and friction wheel 11 withdrawn, thus freeing the resilient disk 10 from contact with either of the friction wheels 11 and 12, whereby it is free to rotate without friction under the pull on" the carriage as it is moved along in the operation of writing. As soon as the carriage in its movement passes the few spaces necessary to bring the stop 26 and lever 27 apart from each other the contact spring 30 is restored to position shown in Fig-4i and all the parts are now ready to be operated anew circuit at this point also.

to return the carriage upon the depression of the key C.

It will be understood that as soon.as the circuit has been broken at switch 30 the magnet 32 is deenergized allowing arma ture 23 to release switch 21 and break the Having thus described my invention what I claim is V 1. The combination with a typewriter, of a resilient friction disk having operating connections to the carriage thereof whereby the rotation of the disk moves the carriage to return it to initial position, an electric motor having its shaft provided with a friction wheel located in proximity to one face of said disk, a movable friction wheel located on the opposite side of the disk in opposition to' the said first named friction wheel, an armature lever for moving said second friction wheel, an electro magnet for moving said armature lever, an electric circuit including said magnet and source of power, and a key for closing said circuit;

2. In a typewriter, the combination with the carriage, of a winding drum having operating connections to the carriage, a'friction disk 'of resilient material carried by said drum, a motor having a friction wheel located in proximity :tO one face of the disk, an armature lever, a friction wheel journaled therein in proximity to theface of the disk opposite said first named'friction wheel an electro magnet for coo era-ting with sai armature lever to cause t e edge of the resilient disk to be clamped between said friction wheels, an electric circuit including the said magnet, and a source of power, and a key for closing said circuit.

In testimony whereof, I afiix my signature in presence'of two witnesses.

ELMER A. BURLINGAME.

Ysitnesses:

JAMES M. SPEAK, Ewb. L. TOLSON.

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