US1749835A - Typewriting machine - Google Patents

Description

March 11, 1930. L. c. MYERS TYPEWRITING MACHINE Filed 001;. 10, 1927 Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE LEWIS C. MYERS, OF FREEPORT, NEW YORK, ASSIGNOR TO ROYAL TYPEWRITER COMI- PANY, INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK 'rxrnwnrrino MACHINE 1 Application filed October 10, 1927. Serial No. 225,328.

This invention relates to fractional line space mechanism or line space release mechanism in which the platen is disconnected from the line space ratchet wheel and may be turned independently thereof through any desired distance and again connected to the ratchet wheel at the end of the turning movement.

An object of the invention is to provide a very simple and compact mechanism for this purpose which is particularly adapted for the Royal portable machine in connection with which it is illustrated, but which may be applied to other types of machines if desired. I

In the drawings:

Figure 1 is a longitudinal section through the end of the platen and connected parts with the ratchet wheel connected to turn with the platen.

Figure 2 is a similar view with the ratchet wheel disconnected from the platen.

Figure 3 is an end view of the platen head with a portion of the release mechanism.

Figure 4 is a detail view of the engaging teeth of the release mechanism on a greatly enlarged scale.

Figure 5 is a side elevation and end view of one end of the platen axle.

A platen axle A is mounted in the platen of a typewriter carriage B which may be of any usual or desired construction. This platen has the usual outer rubber layers C and C and a wooden core D. A finger wheel E is attached to the end of the axle and a ratchet line space wheel F of the usual character is provided.

The platen head 1 is connected to the wooden core D by screws 2 or similar fastenings and this head has an inwardly extending hub 3 having a hollow portion in which is positioned a coil spring 4. A cup-shaped clutch member 5 including a peripheral flange is loosely mounted onthe platen axle and carries the ratchet wheel F. A portion of the inner periphery of the flange of this cupshaped member is provided with an annular row of fine teeth 6.

Fastened to the platen head 1 is a plurality of outwardly projecting headed studs 7 on which is slidably mounted a clutch plate 8 of generally triangular shape which has a plurality of outer projecting portions provided with fine teeth 9 which are arranged concentrically of the axle A and are adapted to engage the internal teeth 6 when the parts are in the Figure 1 position. At this time a turning of the ratchet wheel F will rotate the cup-shaped member 5 and through the engaging teeth 6 and 9 will rotate the plate 8 which in turn through the studs 7 transmits the rotary movement to the platen head 1 and the platen. A release plate 10 lies on the outer face of the plate 8 and is provided with cut-outs or slots as clearly shown in Figure 3, which engage the studs 7 and hold the plate 10 in position. The release plate is substantially triangular in outline and is slidably mounted on the studs 7 and bears against the face of the clutch plate 8 opposite the platen head. There are three slots formed in the release plate and these slots are respectively locatedin the apices of the plate. Two of the slots extend inwardly from adjacent sides of the plate and the third slot extends inwardly from its associated apex to form a seat for the plate. The first two slots are curved in an arc concentric with the seat whereby the plate may be swung about said seat into and out of engagement with the studs. It is additionally held in the desired position by means of an car 11 which is bent into an opening 12 in the plate 8 as clearly shown in Figurel. An ear 11 functions to retain the release plate 10 against being accidentally swung on the seat referred to above, and consequently this ear functions to retainthe release plate in cooperative engagement with the studs 7.

The outer end of the platen axle A is provided with a longitudinal groove 13 as shown in Figure 5 and a tongue 14 of the release plate 10 projects into this groove in position to be engaged by the inner end of a plunger 15 lying in the groove of the axle and coaxial therewith, which plunger is provided at its outer end with a finger piece 16 and has a collar 17 which limits its movement in either direction and prevents accidental removal thereof. The finger wheel E is cut away on I its outer face so that the finger piece 16lies in the cut away portion and does not project beyond the edge of the finger wheel E.

Assuming that the parts are in the Figure 1 position and it is desired to release the platen from the line space wheel F which wheel it will be understood may be actuated by any suitable line space pawl as desired, the operator will exert pressure on the finger piece 16, moving the plunger 15 inwardly and since the inner end'of the plunger engages the tongue 14 of the release plate 10,

this plate and the clutch plate 8 will be given a sliding movement on the studs 7 to the Figure 2 position in which the teeth 9 have been moved out of engagement with the teeth '6 of the clutch cup or member 5 and the platen may be turned independently of the line space mechanism. When the platen has been moved to its desired position, the finger piece 16 will be released and the spring 4 will return the parts to the Figure 1 position.

It will be observed that the invention comprises a very simple and compact arrangement which involves the use of a much smaller number of parts than is usually the case with platen release mechanisms. It is also evident that certain details of construction clutch teeth, a clutch plate surrounding the axle and mounted on the studs for relative sliding movement thereon and provided with teeth for engaging the teeth of the clutch member, a single coil spring surrounding the axle and located between the platen head and the clutch plate for yieldably retaining said plate in clutched engagement with the clutch member, and manually operable means for moving the clutch plate against the tension of the single spring for disengaging said plate from the clutch member.

2. In a fractional line spacing mechanism for typewriting machines, the combination with an axle, of a platen freely journaled on said axle and including a head, a line space ratchet wheel journaled on the axle, and means for clutching the platen and wheel comprising studs immo vably fixed to the platen head, a clutch cup movable with the ratchet wheel and including a peripheral flange surrounding the studs and having an 1 annular series of inwardly projecting teeth,

a clutch plate surrounding the axle and mounted on the studs for relative sliding movement thereon and provided with peripheral teeth for engaging the teeth of the clutch cup, a single coil spring surrounding the axle and located between the platen head and the clutch plate for yieldably retaining said plate in clutched engagement with the clutch cup, and manually operable means for 7 moving the clutch plate against the tension of'the single spring for disengaging said plate from the clutch cup. 7

8. In afractional line spacing mechanism for typewriting machines, the combination with an axle having a longitudinal groove at one endthereof, of a platen freely journaled on said axle and including a head located adjacent the groove, a line space-ratchet wheel journaled on theaxle, and means for clutching the platen and wheelecomprising studs immovably fixed to the platen head and arranged in triangular formation, a clutch cup movable with the ratchet wheel and including a peripheral flange surrounding the studs and having an annular series of inwardly projecting teeth, a clutch plate surrounding the axle and mountedon" the studs for relative sliding movement thereon and provided with peripheral teeth for engaging the teeth of the clutch cup, means located between the platen head and the clutch plate for yieldably retaining said plate in clutched engagement with the clutch cup, and manually operable means mounted in the groove of the axle for moving the clutch plate against the tension of the yieldable means for disengaging said plate fromthe clutch cup. V

4:. In a fractional line spacing mechanism for typewriting machines, the combination with an axle having a longitudinal groove at one end thereof, of a platen freely journaled on said'axle and including a head located adjacent the groove, arline space ratchet wheel journaled on the axle, and means for clutching the platen and wheel comprising studs fixed to the platen head and arranged in triangular formation, a clutch member movable with the ratchet wheel and having a plurality of clutch teeth, a clutch plate surrounding the axle and mounted .on the studs for relative sliding movement and provided with teeth for engaging the teeth-of the clutch member, a release plate slidably mounted on the studs and bearing against the face of the clutch plate opposite the platen head, said release plate being provided with a tongueprojecting into the'groove of the axle, means located between the platen head and the clutch plate for yieldably retaining said clutch plate in clutched engagement with the clutchmember, and a manually operable plunger mounted in the groove of the axle and engageable with thetongue of the release plate for moving the clutch plate against the tension of the yieldable means for disengaging said plate from the clutch member.

5. In a fractional line spacing mechanism for typewriting machines, the combination with an axle having a longitudinal groove at one end thereof, of a platen freely journaled on said axle and including a head located adjacent the groove, a line space ratchet wheel journaled on the axle, and means for clutching the platen and wheel comprising studs fixed to the platen head and arranged in triangular formation, a clutch cup movable with the ratchet wheel and including a pcripheral flange surrounding the studs and having an annular series of inwardly projecting teeth, a clutch plate surrounding the axle and mounted on the studs for relative sliding movement and provided with peripheral teeth for engaging the teeth of the clutch cup, a substantially triangular release plate slidably mounted on the studs and bearing against the face of the clutch plate opposite the platen head, said release plate being formed in its apices with three slots for receiving the studs, two of the slots extending inwardly from adjacent sides of the plate and the third slot extending inwardly from the apex to form a seat for the plate, the first two slots being curved in an are concentric with said seat whereby said plate may be swung about said seat into and out of engagement with said studs, said release plate being provided with a tongue projecting into the groove of the axle, means located between the platen head and the clutch plate for yieldably retaining said clutch plate in clutched engagement with the clutch member,.and a manually operable plunger mounted in the groove of the axle and engageable with the tongue of the release plate for moving the clutch plate against the tension of the yieldable means for disengaging said plate from the clutch member.

6. In a fractional line spacing mechanism for typewriting machines, the combination with an axle having a longitudinal groove at one end thereof, of a platen freely journaled on said axle and including a head located adjacent the groove, a line space ratchet wheel journaled on the axle, and means for clutching the platen andwheel comprising studs fixed to the platen head and arranged in triangular formation, a clutch member movable with the ratchet wheel and having a plurality of clutch teeth, a clutch plate surrounding the axle and mounted on the studs for relative sliding movement and provided with teeth for-engaging the teeth of the clutch member, said clutch plate being provided with an opening, a release plate slidably mounted on the studs and bearing against the face of the clutch plate opposite the platen head, said release plate being provided with a tongue projecting into the groove of the axle and with an ear projectengaging said plate from the clutch member.

In testimony whereof, I have hereunto subscribed my name.

LEWIS O. MYERS.

Images