US1425291A - Typewriting machine - Google Patents

Description

G. A. SEIB.

TYPEWRITING MACHINE.

APPLICATION FILED AUG.30. 1919.

Patented Aug. 8, 1922.

IIIIIYi'I/Il/ WITNEESEfi 6% M M oniran PATENT GEORGE A. snrn, or ILION, NEW YORK, ASSIGNOR T0 REMINGTON TYPEWRI COMPANY, on ILION, NEW YORK, A CORPORATION on NEW YORK.

TYPEWRITING- MACHINE.

Specification of Tietters Patent.

Patented Aug. 8, 1922.

Application filed August 30, 1919. Serial No. 320,938.

its main object to provide a device for preventing the said spring from becoming disrupted or completely unwound due to the breaking or accidental release of the carriage strap or band.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction,combinations of devices, and arrangements of parts hereinafter described and particularly pointed out in the claims.

In carrying out the invention in the present instance, I provide what may be termed a swinging stop or inertia pawl which is normally controlled by a light spring so that in ordinary stepby-step movements or runs of the carriage said pawl will be held inoperative. Sometimes the main spring becomes accidentally disconnected from the carriage, either through the breakage of the usual strap or because said strap escapes from the control Ofthe operator or repairman when the strap disconnection or re-connection operation is taking place, or for some other reason. In such case the main spring drum attains a speed much greater than its speed under ordinary operations. the result being that the inertia pawl will fly outward, overcomingthe resistance of its light spring,this outwardmovement being limited by a stop on the spring drum. When the pawl reaches this limit of outward movement its path is obstructed by a stationary stop which will arrest it and the spring drum automatically,

and will hold the parts in arrested position until the operator or repairman again assumes control, when a slight'pull on the spring drum strap towards the right will release or separate the pawl or movable stop from the stationary stop and allow it to be restored by the light spring to normal inoperative position.

My invention will be described and explained in detail in connection with the accompanying drawings wherein Figure 1 is a fragmentary front elevation of the spring drum of a No. 10 Remington typewriting machine and its associate parts, with my invention applied thereto.

Figure 2 is a view corresponding to F igure 1 but showing the inertia pawl in operative positlon.

Figure 3 is a sectional detail view, the section being taken on a plane indicated by the dotted line at a" in Figure 1 and looking in the direction of the arrow at said line.

Indicated at 1 in Fig. 1 is the rear bar of a No. 10 Remington carriage, to the righthand end of which is screwed arearwardly curved and downwardly extending arm 2 terminating in a hook 8 which is engaged by the outer end ofthe usual band or strap 4:, said strapbeing connected to a spring drum or wheel 5 mounted on a shaft 6 supported in a bracket 7 secured to the top plate 8. The wheel or rotary element 5 is cut out, providing arms or spoke portions 9, and houses a coiled main or carriage spring 10, one end of which is secured to the wheel and the other end to the shaft or axle of the wheel. Where the spring is connected to the wheel it is formed into a loop 10 that is slipped over a post or stud 10 secured to the wheel arm 9, and there is a cover plate 10 for the spring that is secured to said post and also to another one diametrically opposite; all as common in the Remington machine. This propelling spring tends constantly through its action on the band or strap 4 to draw the carriage leftward over the top plate, leftward movements of the carriage being controlled by escapement mechanism and tabulating mechanism of the usual or any suitable character.

When for any purpose it is desired to disconnect the carriage from the spring drum the strap or flexible connection a is disconnected from the hook 3 and preferably anchored to a stationary part. Sometimes, however, the strap slips from the fingers or it occasionally may break, the result being that control of the spring drum is lost so that it runs down very rapidly, sometimes resulting in a breakage of the parts, and in any event a loss of tension in the main spring 10. Besides the tape or band is liable to become tangled up in the mechanism. The principal object of my present invention is to avoid this breakage, entanglement and running down of the spring, and I accomplish this object by providing an automatically acting stop mechanism comprising preferably .a'linovable stop or pawl on the spring drum and a relatively stationary stop,

which automatically coact to arrest the drunibefore it can turn very far after control of it has been lost. The movable stop aforesaid,

which may be termed an inertia pawl or centrifugally-operating stop, .is designated in the drawings by the numeral 11, being pivoted tothe'forward face of one of the arms 9 by means of a shouldered pin or rivet 12 and out of the plane of the rim of the wheel. The pawl is adapted to turn freely on the pin whichis tightly riveted to said arm 9. A; light coiled spring 13 is connected to thepawl at one end, the other end of said spring being anchored to-a lug 14 struck up from the adjacent arm-9. 'Normally the pull of the spring 13 is substantially in a line between its anchorage'M and the center of rotation of the pawl 11, so that the pawl s thereby maintained in a substantially uniform normal position without being in contact with any stopf As av resultof the construction a rapid rotation of the spring drum, such as it would'besubjected to under the abnormal conditions noted, would tend to throw the free end of the stop or pawl outward. The outward swing of the pawl .under such conditions iswlimited preferably by a stop pin 15. Whenthe pawl is in contact with the stop pin its free' end projects [beyond the periphery of the spring drum and into the path of a relatively stationary stop in the form of .a pin 16 projecting forward from the face of the bracket 7. i

From what has been said it is not though necessary to explain the operation of the mechanism at length. The normal position of :the parts is shown in Fig. 1 and it is ap parent that at the ordinary speed of rotation of the spring drum the stop pawl will not be substantially aii'ected but'will remain 1'11 or -;close to its normal position, so that during such rotations the stop ipEtWl will pass the .stop pin 16 without touching it. With the spring drum in the position shown in Fig. 1,

however, if it he suddenly released by vdisconnecting the strap 4 from the carriage andfreeing the strap, said spring drum will stant 'to turn rap-idly, causing the pawl to fly outward against the :pull of thespring 13 until arrested by the stop 15, bringingthe ing the drum and connected parts.

free end of the .pawl beyond the periphery of the drum and so that it will contact with the stop 16 -asyshown in Fig. 2, thus arrest- It is plain thata slight rightward pull applied .to

the band Lwhen the parts arein the Fig. 2 position will retract the drum andtmove the pawl or swinging stop far enough downward to permit its ,point to escape from engagementnwith the stationary stop 16. Thereupon thespr ng lfi Will aotto restore the swinging stop pawl 11 to'its normal position within the periphery of. the spring drum. The lug ld will prevent excess inward movement of the stop pawl.

The said spring wheel as customary carries a cup-like structure comprising a bevel gear l'f and also a ratchet wheel18, which structure is secured to the wheel shaft by a scre'w 19.: These devices relate more particcentri'fugallyoperating stop to cause the ar rest of said rotatory element and -prevent;a0

undue unwinding of said spring when said rotatory element is disconnected from-said carriage.

.2. The combination ofa drum, a driving sprlng therefor, a centrifugally-operatlng stop-pawl mounted thereon and, normally lying within the periphery of said drum but when actuated adapted to project .beyond said periphery, astopon said drum for limiting the outward throw of said-'stop-pawl, and an exterior-1y arranged stationary stop to engage the projecting portion .of' said pawl when thrown out by centrifugal force.

3. In atypewriting machine, the com-bina- I tion of a. spring" drum, a stop ipivotally mounted on said drum, a second stopon said drum, a relatively stationary stop,land a spring normally maintaining said pivoted stop out of position for .co-operation with said stationary stop, said pivoted stop .automatically throwing to operative position against said second stop during abnormally rapid movements of said drum. I

1-. In-a-typewriting machine, the combination of a spring .drum, a stop movably mounted on said drum, a second stop .on said drum, a relatively stationary stop, and spring means normally maintainingsaid movable-stop out of position for co-operation with said stationary stop, zsagid BlOV'? able stop being automatically thrown into operative position in contact withsaid second stop andagainst the pull, of said spring means -under abnormally rapid rotation of said spring drum. n

5. Ina typewriting machine, the combination with a spring drum,a stoppawl piv-' oted thereon, a coiled spring connected to said pawl stop and maintaining it in 'agnorll O 5 mal position, a stop on, said spring drum for .1

limiting movement of said stop pawl in opposition to said spring, and a relatively stationary stop with which said stop pawl is adapted to co-operate.

6. In a typewriting machine, the combination of a carriage spring drum, a swinging stop mounted thereon, a second stop on said spring drum and a relatively stationary stop, the swinging stop co-operating with both said other stops to lock said spring drum against rotation under the operation of the main spring when said spring drum is disconnected from said carriage and allowed freely to rotate.

Signed at llion, in the county of Herkirner and State of New York this 20th day of August A. D. 1919.

GEORGE A. SEIB.

Witnesses:

LINNIE F. BURNETT, MARGARET M. PIERCE.

Images