US1536452A

US1536452A - Typewriting machine

Info

Publication number: US1536452A
Application number: US644571A
Authority: US
Inventors: Phelps Joseph
Original assignee: Remington Typewriter Co
Current assignee: Remington Typewriter Co
Priority date: 1923-06-11
Filing date: 1923-06-11
Publication date: 1925-05-05
Anticipated expiration: 1942-05-05

Description

Mas, 1925.

y J. PHELPS TYPEWRITING MACHINE June 11, 1,923-

@7- E AT- TRNEY Patented May 5, 1925.`

1,536,452 `UNITED STATES PATENT OFFICE.

JOSEPH PHELPS, OF NORTH CALDWELL,

NEW JERSEY, ASSIGNOR TO REMINGTON TYPEWRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYIEWRITING MACHINE.

Application led June 11, 1923. .Serial N'o. 644,571.`

To all whom it may concern.'

Be it known that I, JOSEPH PHELPS, citi- Zen of the United States, and resident of -North Caldwell, in the county of Essex and State of vblew Jersey, have invented certain new and useful Improvements in Type-` writing Machines, of which the following is a specification.` 1 i My invention relates to noise reducing mechanism for typewriting machines `and its chief object is to provide connections between the carriage motor or spring drum and the driving shaft of the ribbon mechanism which connections reduce noise to a minimum and do away entirely with the clicking sound which is inherent in pawl and ratchetmechanism such as has heretofore usually been employed to connect the ribbon feeding mechanism with the carriage spring drum. i Y

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 my inventionin the pres ent instance I introduce between the spring drum andthe beveled driving pinion which is concentric with it, a coiled spring so arranged as to provide a clutch connection between said pinion and said spring drum when the latter is turning to move the carriage in letter feeding direction, said coiled spring releasing so as automatically to disconnect the pinion from the drum when the latter turns oppositely during return movements of the carriage. The spring clutch is closely wound so aspromptly to bind on and clutch the beveled pinion and through it the ribbon feeding devices, thus avoiding lost motion which would be harmful, as a plurality of type impressions might otherwise be made at the same point through the ribbon, tending towear a hole in it. However, this close winding of the clutch spring might sometimes result in failure to release the pinion promptly during the carriage return movements. and in order to insure such promptrelease, I prefas the return movement begins, thus preventing friction or other accidental impulses from causing a back feeding of the ribbon.

My invention will be more particularly described in connection with the accompanying drawings wherein- Figure 1 is a fragmentary front elevation partly in section showing a carriage with its motor or spring drum having my invention applied thereto.

Figure 2 is a vertical sectional view taken 3 with the platen carriage of the machine as it travels back and forth across the top plate. The carriage may be the usual platen carriage of the Remington typewriting machine comprising a truck and a platen frame shiftably supported on the truck, of whichv the grooved rear bar 4L and one of the end bars 5 are illustrated. Fixed to the righthand rear corner of the carriage truck by a screwV 6 is a curved arm 7 terminating in a hook in which is connected one end of a band or strap 8, the band running over the circular iiange 9 of a spring drum 10 to which drum the end of the band 8 is con nected at 11. The drum 9, 1() is vertically arranged and projects upward through a slot indicated at l? in the top plate 1.- Dur'-Y ing traveling movements of the carriage and turning movements of the drum the band 8 winds on and oif the flange 9. The drum is rotatively supported on a stub y,shaft 12l is secured a hook 16 which is engaged-by the inner end of a coiled main spring 17, the outer end of the main spring being secured at 18 to the spring drinn 10. A cover plate 19 protects the main spring at the back. The shaft 12 is secured adjustably in its bracket or support by devices preferably like those disclosed in my co-pending application, Sr. No. 573,526, said devices including a knurled thumb piece 2O by which the position of the shaft may be adjusted and the tension of the main spring regulated. During movements of the carriage and back and forth rotary movements of the spring drum the shaft 12 remains stationary.4 rThe carriage main spring or motor spring as will be plain from Fig. 1 tends constantly to turn left'ward or counter-clockwise, the force being transmitted to the drum 10 and from it through the band 8 to the platen carriage, movement of the carriage being normally controlled by the escapement devices (not shown). Not only does the spring drum or motor move the carriage leftward but it also feeds the ribbon and to this end there are provided a pair of intermeshing beveled pinions 21, 22, the pinion 21 being mounted concentrically with the spring drum in a novel manner presently to be described and the pinion 22 being mounted on the` ribbon driving shaft 28 which is arranged transversely of the machine and is adapted to be slid endwise back and forth to reverse the direction of the ribbon feed as is well understood. Said shaft and the pinion 22 slidably engage so that the constant engagement between said pinion 22 and the pinion 21 is not disturbed by the endwiseI sliding movements of the shaft. The rotary driven member or pinion 21 is so connected with the rotary driving member, driver or spring drinn that as the latter turns leftward it will turn the pinion, said pinion transmitting its turning movements to the pinion 22 and to the ribbon shaft 23, the return movement of the spring drinn or driving member automatically7 breaking the connection with the driven member or pinion 21 so that the ribbon feed is inoperative during such return movements, rilhe pinion 21 is bored out or perforated as indicated at 24, leaving, however, a slight fiange or rib 25 at the front end of the bore. The outer face of the pinion back of its beveled teeth 26 is formed with a circular seat or depression 2? providing a sort of hub or binding` face. The pinion 21 fits over a cylindrical member 28 which. has two connecting boresr 29' and 80, the bore 29 fitting over the part 12a of the' shaft 12 and thebore 30 fitting over the part 12b of said shaft. A pin 31 on vthe shaft fits in a hole 32 in the member 28 so that said member is forced to turn with the shaft. Atits outer or front end the member 28 is formed with a depression 33 which is engaged by the flange 25 of the pinion 21 serving as a bearing for said pinion and assisting to maintain the bore 24 separated from the outer facey of the bearing member 28. A headed screw 34 is threaded into the reduced end 12b of the shaft, the head of said screw preventing displacement both of the member 28 and the pinion 21. Fitting closely or snugly over the seat or hub 27 is a coiled wire spring or clutch member 35. One .end of said spring is free but the opposite end 35 is turned outward, passing through an opening in an annular housing 36 which surrounds and encloses the clutch spring 35. The `housing in addition to its annular portion 3G comprises ears 87 which are perforated to receive screws 38 by which the housing is secured to the front face of the drum 10. One of the ears in lieu of receiving a screw however is split as indicated at 39 to permit the annular part 36 to be readily contracted or ex panded. r1`he construction is such that `when the spring drum l*turns towards the left it will act through the housing 86 on the outer end 35a of the spring 35 to cause it to bind or clutch the pinion 21, forcing the pinion to turn with the drum; but when re versed as the carriage is restored from left to right, said drum acts through the hous ing 3G and end 85a of the spring to release the pinion 21 from the clutch.

In order to insure complete freedom of the pinion at this time, I prefer to employ a second clutch member. This second clutch member is in the form of a. flat coiled spring 40 which surrounds the member 28, being arranged in the space between said member and the bore 211 of the pinion 21. Said spring 40 fits closely over the member 28 and its front end is bent outward as indicated at 10'd to engage in a fore-and-af! groove 11 in the pinion 21, t-hus connecting the fiat clutch spring 40 with the pinion. The pinion as it turns to feed the ribbon acts on the end 40a to loosen the clutch f1.0 and render it inoperative; while when the reverse movement of the drum takes place, any tendency through binding or sticking of the main clutch 35 to turn the pinion 21 is prevented by reason of the spring clutch 40 gripping the outer face of the member 28.

It will be observed that when the spring drum turns leftward to advance the carriage and feed the ribbon the hub 15 turns with it as does the housing or annulus 36, the latter tightening the spring 35 on the hub portion of the beveled pinion 21 and forcing said pinion to turn with the spring drum. This action of the pinion loosens thel inner clutch spring 1() which will rotate with the pinion 21, said spring 410 turning on the bearing member 28 which remains stationary asY does the shaft 12 with which said member 28 is rigidly connected by the pin and slot connection 31, 32. During return movements of the carriage, however, and consequently reverse turning of the spring drum, the main clutch spring 35 will be loosened, releasing the pinion 2l, and any tendency of said pinion to turn, due to accidental impulses of friction or the like, will be instantly transmitted to the clutch spring 40 which will bind on the periphery of the co-operating clutch member 28, said member remaining stationary as before. The clutch devices are comparatively noiseless in operation and no sound results during carriage return movements due to interaction of the connections between the carriage motor and the ribbon mechanism.

Principles of my invention are applicable to other parts of typewriting machines, and constructional changes may be made without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine, the combination of a rotary carriage motor, a rotary driven member having a hub, and a coiled spring clutch connected at one end to said motor and surrounding said hub, said spring clutch binding on said hub during rotary movements of said motor in one direction and releasing said hub alnd said driven member during rotary movements of said motor in the opposite direction.

2. In a typewriting machine, the combi- `nation of a rotary carriage motor, a ribbon driving pinion provided with a hub, and a clutch spring closelv coiled about said hub and having one end connected to said carriage motor, said clutch spring binding on said hub during rotation of said motor in one direction only.

3. In a typewriting machine, the combination of a carriage, a carriage spring drum connected thereto, a ribbon driving pinion provided with a hub, a clutch spring coiled around said hub and having one end connected to said spring drum and the other end being free on the hub, said clutch spring binding on said hub when the spring drum turns to advance the carriage in letter-feeding direction, said spring releasing said hub during turning movements of said spring drum in the opposite direction.

4. In a typewriting machine, the combination of a rotary driver, a rotary driven member, a clutch spring coiled about said driven member, and a housing secured to said driver and closely surrounding said clutch spring, said housing having a slitted portion so that it may be readily expanded and contracted.

5. In a typewriting machine, the combination of a carriage, a spring drum connected thereto, a ribbon driving shaft, connections between said shaft and said spring drum comprising a pair of intermeshing beveled pinions, one of said pinions being provided with a hub, and a wire spring coiled around said hub and binding thereon during rotary movements of said hub as the carriage travels in printing direction and thus serving to connect the pinion with the .spring drum, said spring automatically releasing said hub and said pinion during the return movements of said spring drum and said carriage.

6. In a typewriting machine, the combination of a rotary carriage motor, a rotary driven member, a relatively stationary bearing therefor, a releasable clutch between said motor and said driven member, and a second releasable clutch between said driven member and its bearing.

7. In a typewriting machine, the combination of a driving member, a driven member, a support for said driven member, and a pair of oppositely acting clutches one between the driving and driven members and the other between the driven member and its support.

8. In a typewriting machine, the combination of a rotary driving member, a rotary driven member, a stationary bearing, and a pair of oppositely wound spring clutches, one connecting the driving and driven members and the other between the driven member and the bearing.

9. In a typewriting machine, the combination of a driving member, a rotary driven member provided with a perforation, a clutch spring surrounding said hub portion exteriorly and connecting said driven member with said driving member, and a second clutch spring arranged inside said perforation and adapted to act oppositely from said first recited clutch spring.

10. In a typewriting machine, the combination of a carriage, a carriage motor, a driven member. and a pair of spring clutches, one of said clutches being connected to the other through said driven member.

11. In a typewriting machine, the combination of a carriage, a carriage spring drum, a coiled spring clutch having one end connected to said drum, a driven member on which said clutch operates, and means for preventing said driven member from moving when released by said clutch.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 8th day of June, A. D. 1923.

JOSEPH PHELPS. Witnesses:

E. M. WELLS, CHARLES E. SMITH.