US630121A - Type-writing machine. - Google Patents

Description

No. 630.!2I. PatentedAu'g l, I899; E. S. SHIMER.

TYPE WRITING MACHINE.

(Application filed Feb. 10, 1899) (mg Model.) y 2 Sheets-Sheet I.

WITNESSES. INVENTOH m: Nam-s PETERS co. vnmo-umm WASHINGTON, n. c.

Patented Aug. I, I899. E. S. SHIMEB.

TYPE WRITING MACHINE.

(Application filed Feb. 10, 1899.)

2 Sheets-Sheet 2.

No Model.)

UNTTTD STAT S PATENT Orricn.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 630,121, dated August 1, 1899. Application filed February 10, 1899. Serial No. 705,179. (No model.)

To all whom it 71mg concern:

Be it known that I, ELMER S. SHIMER, a citizen of the United States, residing at Milton, in the county of Northumberland and State of Pennsylvania, have invented new and useful Improvements in 'lype-YVriting Machines, of which the following is a specification.

My invention relates to the escapement mechanism for type-writing machines whereby the paper-carriage is fed forward the distance of a letter-space at each depression and elevation of a key.

The object of the invention is to provide an improved construction of the same by which the carriage is fed by a light touch and a quick action and the machine otherwise rendered more efficient in use.

The invention consists in the novel construction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a plan view of so much of a type-writing machine as is necessary to illustrate my invention. Fig. 2 is a longitudinal section of the same on the line m 00, Fig. 1. Fig. 3 is a detail perspective view of the escapement mechanism. Fig. i is a plan view of the fixed es.- capernent-wheel detached. Fig. 5 is a similar View of the loose escapement-wheel. Fig. 6 is a longitudinal sectional view of the loose cog-wheel and ratchet at the upper end of the spacer-shaft. Fig. 7 is a similar view of the fixed and loose escapement-wheels. Fig. 8 is a detail sectional elevation of the rock-shaft at the rear of the machine.

In the said drawings the reference-numeral 1 designates the frame of the machine, 2 the paper-carriage, 3 the traverse-rail thereof, and 4 the pivoted spacer rack-bar, all of which may be of any ordinary or suitable construction.

Located centrally in the rear of the machine is an intermittently-rotatable spacer-shaft 5, provided at the upper end with a hub 7, formed with a circular flange or collar 8 intermediate its ends. This hub is secured to the shaft by a set-screw passing through the lower portion thereof. The said hub in its upper side or face is formed with a screwthreaded hole and is also provided with a pin or stud 9. Fitting on the upper end of said hub and supported by the flange or collar is are held in place by set-screws.

a loose cog-wheel 10, having a circular ratchet 12 on its upper side or face. Secured to said hub by a set-screw 13, passing through a hole therein and engaging with the screw threaded hole in the hub, is a spring-pawl 11, which engages with said ratchet. The pin or stud 9 engages with a hole in said pawl. This construction is shown and described in an application for patent filed by me on the 28th day of October, 1898, Serial No. 694,765, and no claim is made thereto in the present application. Secured to said spacer-shaft, near the lower end thereof, by means of a set-screw 14:, is an escapernent-wheel 15, formed with two opposite slots 16 and with an elongated opening 17. Secured to this Wheel is one end of a coiled spring 18, the other end of which is secured to a loose escapement-wheel 19, located below the same and journalcd on said shaft. This wheel is formed with an opening 20, coinciding with the opening 17, the object of these openings being to accommodate the said spring. Secured to said wheel 19 are two upwardly-extending headed screws 21, which pass through the slots 16, which are slightly larger than the shanks of the screws, so as to allow said wheels to have an alternate intermittent movement for feeding the papercarriage to make the letter-space, as hereinafter described. The said screws and slots bear such a relation to each other and to the wheels that as a key is depressed the loose wheel will. move a distance .a fraction less than the fixed wheel and will complete its stroke when the key is released, at which time the fixed wheel and its shaft will move a distance equal to a letter-space, the movement of the shaft being effected through the inedium of the ordinary carriage-driving spring.

Located at the rear of the machine is a rockshaft 24, which is held in place by bearings 23, passing through lugs 22, secured to the frame of the machine. These bearings consist of pins, which are pointed and engage with recesses in the ends of the said shaft and This shaft is provided with a crank-arm 25, which is pivotally connected with the letter-space lever 26, which is adapted to be reciprocated by the depression and release of a key (not shown) in the usual manner. Embracing this rockshaft is a coiled spring 27, one end of which is connected with said shaft and the other to the frame of the machine and is for the purpose of returning the shaft to normal position. Secured to or formed with said shaft is a dog 28, which is adapted to alternately engage tension of the spring 18 will move the said wheel a distance a fraction less than a letterspace, when the screws 21 will come in contact with the ends of the slots in the fixed wheel, which will check the movement of the loose Wheel. While this operation is taking place the dog will engage with the fixed wheel v and hold it while the impression is being made. Upon the release of the key the dog will be returned to normal position, being thrown out of engagement with the fixed wheel, which will move the distance of a complete letter-space, and as the fixed wheel nears the completion of its stroke the rear or opposite ends of the slots will en gage with the pins, so that the loose wheel will move with the fixed wheel, and thus complete its stroke.

From the above it will be seen that the loose wheel upon the depression of a key will be rotated a distance slightly less than a complete letter-space, and upon the return of the key the fixed wheel will move the distance of a letter-space and the loose wheel move forward to complete its stroke.

The object of giving the divided movement to the lower or loose escapement-wheel is to allow the two escapement-wheels to be located very close to each other, so that the oscillating dog will have to make but a very slight movement, and at the same time to give the necessary clearance to the dog, so as to prevent interference with the tooth of the loose escapement-wheel when the key is released. It will be noted that when the key is depressed the loose escapement-wheel will not be moved a complete'letter-space, so that the next tooth will be slightly in rear of the tooth of the fixed wheel with which the dog engages. By this means there will be no liability of the dog striking the tooth of the loose wheel when the'key is released until the latter is out of complete engagement with the fixed wheel, thus insuring greater accuracy in the letterspacing. If the two escapement-Wheels moved acomplete letter-space at each depression and release of the key, there would be liability of the next toot-h of the loose wheel moving past the tooth of the fixed wheel with which the dog engages, and thus prevent the latter from being depressed upon the release of the key. This divided movement of the loose or holdin g wheel is effected through the proportional relation and location of the slots and pins or screws. It also lessens the noise and tension of the machine.

Having thus fully described my invention, what I claim is 1. In a type-writing machine, the combina tion with the letter-space shaft, the letterspace rack-bar and the connections between the same, of the rotatable escapement-wheel secured to said shaft, the loose escapementwheel mounted on said shaft and the connections between said wheels whereby they are alternately and intermittently rotated and also rotated simultaneously or in unison, substantially as described.

2. In a type-writing machine, the combination with the letter-space shaft, the letterspace rack-bar and the connections between the same, of the alternately-rotatable fixed and loose escapement-wheels mounted on said shaft, one of which is formed with a slot and the other provided with a pin or screw engaging therewith, the spring connecting said wheels, and the oscillating dog, said slot and pin being so proportioned with respect to each other and to the wheels, that said wheels are adapted to be alternately and intermittently rotated and also to be rotated simultaneously, substantially as described.

3. In a type-writing machine, the combina .tion with the letter-space shaft and means for rotating the same, of the fixed and loose es= capement-wheels mounted on said shaft, one of which is provided with a slot and the other with a pin engaging therewith, the spring connecting said wheels, and the oscillating dog, the construction being such that upon the depression of a key the dog will be thrown out of engagement with the loose wheel allowing it to turn a part of the distance of a letterspace, and into engagement with the fixed wheel, and when said key is released the fixed wheel turns the distance of a letter-space and the loose Wheel turns to complete its stroke, substantially as described.

4:. In a type-writing machine, the combination with theletter-space shaft, the loose cogwheel at the upper end thereof, the ratchet secured thereto or formed therewith, the spring-pawl secured to said shaft, and the spacer rack-bar, of the fixed and loose escapement-wheels, one of which is formed with a slot and the other with a pin, the spring connecting said escapement-wheels, and the 0s cillating dog, the said slot and pin being so proportioned that said wheels are adapted to alternately and intermittently rotate and also to rotate simultaneously or in unison, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ELMER S. Sl-IIMER.

WVitnesses:

J 0s. ANGS'IADT, H. E. ANGSTADT.

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