US951542A

US951542A - Type-writing machine.

Info

Publication number: US951542A
Application number: US42072108A
Authority: US
Inventors: John C Mclaughlin
Original assignee: Underwood Typewriter Co
Current assignee: Underwood Typewriter Co
Priority date: 1908-03-12
Filing date: 1908-03-12
Publication date: 1910-03-08
Anticipated expiration: 1927-03-08

Description

J. c. MoLAUGHLIN. TYPE WRITING MACHINE.

APPLICATION IILED MAB. 12, 1908.

Patented Mar. 8, 1910.

WIT/n ess as UNITED s'rATEs PATEN o Io JOHN C. MQLAUGHLQIN, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, 1\T. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Application filed March 12, 1908. serial'No. 420,721.

To all whom it may conccrn:

Be it known that I, JOHNO. ABICLAUGH- LIN, a citizen of the United States, residing in Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Typellriting Machines, of which thefollowing is a specification.

This invention relates to the carriage escapement mechanism of typewriting machines, and particularly those of the Underwood type.

The object of the invention is to provide simple and inexpensive means which mayreadily be applied to existing machines, for enabling the operator at will to cause the carriage to move two letter spaces instead of a single letter space at each type impression, or at each movement of the carriage escapement mechanism, for convenience in writing headings, or emphasizing words, etc.

The invention is illustrated in connection with the escapement mechanism disclosed in United States Patent No. 769,804, in-which the loose or feeding dog is given a positive diagonal movement during the return stroke v mounted upon a device which is shiftable to enable said loose or feeding dog to spring past either one or two of the escapement teeth, at the will of the operator, according as a single or double s ace is required after the impression of each etter. Said dog stop ismounted by means of a lever upon a stationary part of the'machine, and said lever is connected by means of a link and rock shaft to a key or finger-piece at theifront of the machine over the keyboard. The rock shaft preferably has a cam arm to vibrate said lever and force or lock it against stops,-

whichv limit its strokes.

Other-features and advantages will here-- inafter appear. i a

In the accompanying drawings, Figure 1 is a front perspective view showing my improvements applied to an Underwood front strike writing machine; the parts being shown in position to cause double spaci g, of the carriage at the type stro t'e's Fig: t' is a diagrammatic plan to illu trat I ,e the operat1on seen at Fig. 1. Fig. view. similar the Fig. 2 position. Fig. 5 is a View similar to Fig. 4, but. illustrating the parts in the Fig. 3 p0 ition. Fig. 6 is a perspective view of this a pawl stop.

In said machine, tl'le power-driven carriage is provided with an escapement rack 1, which meshes with a pinion 2, ,the latter by means of pawls 3 driving a toothed escapement wheel 4. A rocker 5,hung upon pivots 6 in a bracket 7, carries a detent dog 8, which is normally disengaged from the escapement wheel 4, and also a loose or pivoted spacing dog or pawl 9. It will be understood that in. said machine'a universal bar (not shown) vibrates at each type stroke, and has a part to engage an adjustable projection 10 .on the justable lever which carries .the

rocker 5, to push the same rearwardly to effect the proper cooperation of the feeding dogs and the escapement wheel. The loose dog 9 is pivoted at 11 on the rocker, to enable it to swing past the teeth of the escape ment wheel, as soonas the rocker swings back far enough to liberate said loose dog, A draw-spring 12, connected at its front end to a post 13 and extending diagonally to said loose dog, both causes the latter to swing past the teeth of the escapement wheel 4, and also draws the rocker 5 forwardly to initial position. The movement of the loose pawl 9 under the tension of said spring is arrested by means of a stop consisting of the beveled shoulder portion 14 of a suitably mounted screw 15. By reason of the bevel, the action of the pawl is brought under propercontrol, as set forth in said Letters Patent.

The parts so far described are in common use on said Underwood machine.

I thread the stop-screw 15 into the rear end ofa stud 16 rojecting rearwardly from r the upper end of a lever 17, the latter pivoted at 18 u on the bracket. 7, and its movement being imited by stops 19, 20 formed upon'a plate 21 fixed to said bracket. The lever 17 is shifted from side to side by me us as at Wig and at its left hand end it is longi- Fig. 4 y is a front elevation illustrating-the parts in of a link 22, a rock-shaft 23 and keys 24, 2:)", M5

tudinally slotted at 28 to ride loosely upon the rear end of the rock shaft 23. A pin 29 projecting forwardly from the slotted .end of the link, works in a cam slot 30 formed in an arm 31 secured upon the rock shaft 23. The cam slot is so shaped that as the arm is rocked up and down, the link 22 is pulled or thrust endwise to shift the lever 1.? and the stop-screw 15 thereon. At its ends the camslot is formed with less inclined portions 32, to force the pin and link 22 tolnck the lever or its stud 16 against either one or the other of the stops 19, 20, so that there may be no I,

danger of the lever working loose and throwing the stop-screw 15 out of position. The

rock shaft 23 may be provided with an index 33, to point to numbers seen upon the machine frame 34, to indicate the number of 5 spaces the carriage will move at each type i key operation.

When the operator desires to space the written letters widely, he depresses the key 1 2 and 4, so that when the loose dog 9' is released from the escapement wheel tooth, it is drawn far enough to the left to pass two of said teeth, as shown in said figures, so that when the dog rocker 5 resumes its normal position, the loose dog 9 will catch the next Wheel tooth but one from that from which it just escaped, and hence the escapement wheel and the carriage will be advanced-two letter spaces. This 0 aeration is repeated at every key stroke. Y hen the operator desires to resume single or ordi- :cing, he depresses the key 25, and the '1') n 29 is cammed to the right, and the leverl7 is locked against the stop 20, with.

the screw 15 in the position seen at Figs. and 5, in which position the loose dog performs its ordinary single spacing. func- 'tion, escaping past only one tooth of "the escapement wheel at each operation.

emcee Having thus described my invention, 1 claim:

1. In a typewriting machine, the combination with a carriage escapeinent wheel or rack, and a detent dog and a spacing dog therefor, of a spring for the spacing dog, a stop for the spacing dog, a lever on which said stop is mounted, a link connected to said lever, a rock shaft having cain connected to said link, and a finger-piece upon said rock shaft; means being provided to limit the strokes of the lever to enable the feeding pawl'to vibrate pasteither one or two of the escapernent teeth.

2. In a typewriting machine,the combination with a carriage escapement wheel or rack, and a detentdog and a spacing dog therefor, of a spring for the spacing dog, a stop for the spacin dog, a lever on which said stop is mounts a link connected to said lever, a rock shaft having a cam connected to said link, and a finger-piece upon said rock shaft; means being provided to limit the strokes'of the lever to enable the feeding pawl to vibrate past. either one or tv. 0 of the escapement teeth; said cam being;

rovided with means at its ends to incl-z the .ever at the extremes of its vii ration.

3. In typewriting machine, the combination with a carriage escapement wheel or rack, and a detent don and. a spacing dog therefor, of a spring tor the spacing dog, a stop for the spacing dog, a lever on which said stop is mounted, a link connected to said lever, a rock shaf', having a cam connected to said link, and a finger-piece upon said rock shaft; means being provided to limit the strokes of the lever to enable the feeding pawl to vibrate past either one or two of the escapement teeth; said cam being I provided with means at its ends to lock the ever at the extremes of its vibration; said lever-arresting means including fixed stops against which the lever is forced by the locking portions of the cam.

JOHN C. MGLAUGHLIN. Witnesses:

K. FRANKFORT, JOHN =0. Samar.