US2280702A - Typewriting machine - Google Patents

Description

April 21, 1942. G. F. HANDLE Y 'IYPEWRITING MACHINE 2 Sheets-Sheet 1 Filed Jan. 18, 1941 ear 6 1 mm nd/eg #6096 4TT0RNEY$ April 21, 1942;

G. F. HANDLEY TYPEWRITING MACHINE Filed Jan. 18, 1941 2 Sheets-Sheet 2 INVENTOR leo ge FHand leg 642% 7 W e;

4; ATTORNEYS Patented Apr. 21, 1942 TYPEWRITING MACHINE George F. Handley, Glendale, N. Y., assignor to Royal Typewriter Company, Inc., New York, N. Y., a corporation of New York I Application January 18, 1941,.Serial No. 375,061

2 Claims.

This invention relates to. typewritingmachines, and more particularly to typewriter ribbon positioning and feeding mechanism. Mechanism embodying the invention may be employed advantageously for positioning and feeding typewriter ribbons or strips of various kinds, but is especially adapted for positioning and feeding narrow carbon paper or like copying strips of car bon.

In the feeding of certain kinds of strips-or ribbons, such as carbon ribbons for photooffset copy, typing on multilith plates or hektograph ribbons for making imprints which are subsequently used for producing positive copies, it is important to feed the ribbon at a rate corresponding to the rate of carriage letter-spacing travel so as to assure the presentation of a fresh ribbon portion at the printingpoint for each new type impression. The construction disclosed herein as illustrating one embodiment of the invention is capable of feeding ribbon in this way, but it will be apparent that the invention is not limited in its application to mechanism for feeding any specific type of ribbon.

An object of the invention is to provide typewriter ribbon mechanism of a simple and efficient construction operable in an improved mannor in timed relation to thetypewriter carriage letter-spacing travel. Generally stated, this object is accomplished by theinterposition of simple driving connections between the ribbon-feeding mechanism and a carriage draw band connected in the usual manner between the carriage and a driving motor, such as the conventional spring barrel.

Another object is to provide mechanism of the character referred to above which may be easily applied as an attachment to a standard typewriter in a manner facilitating the making of driving connections between the carriage and the ribbon-feeding mechanism.

Other objects will become apparent from a reading of the following detailed description, the appended claims, and the accompanying drawings, in which:

Figure 1 is a fragmentary top plan view of a typewriting machine with some conventional parts omitted, and showing equipment embodying the invention applied thereto;

Figure 2 is a longitudinal vertical sectional view taken on the irregular lines 2-2 of Figure 1; Figure 3 is a detailed transverse sectional view taken on the line 33 of Figure l and drawn on an enlarged scale;

Figure l is a partial end elevation looking in the direction of the arrow IV in Figure 1, with some parts broken away, and drawn on an. enlarged scale; and v Figure 5 is a detailed sectional view of a oneway drive ratchet or clutch drawn on an enlarge scale. I

Mechanism embodying the invention may be used in connection with typewriters of various kinds. For the purposes of illustration, a preferred embodiment of the invention is shown applied to a Royal standard typewriter including a main frame A and a carriage B mounted on the frame for letter-spacing and return movementsv by meansof a ball race frame rail 1 and a carriage rail 2. A platen C is mounted on the carriage end plates 33, and is adapted to be rotated for line-spacing by a combined line-spacing and carriage return lever (not shown). A spring-powered drum or barrel 4 journaled on the frame between the right and left end walls thereof is connected to the carriage by a draw band 5 for moving the carriage in theletterspacing direction, that is, to the left as viewed in Figures 1 and 2. Such carriage movement is controlled by escapement mechanism of a'known or any suitable kind and which may include an escapement wheel 6 journaled on an escapement frame (not shown) to rotate with a pinion 1 in: mesh with an escapement rack 8 supported on,

the carriage B.

The spring barrel 4 is provided with a gear 9 which meshes with and drives a pinion Ii for rotating a shaft H connected to mechanism for driving the usual ink ribbon spools (not shown) The parts referred to above may be of known construction and arrangement relative to each other, and, considered alone or in combination with each other, they do not constitute the invention claimed herein. The invention resides in other parts to be described, and the combinations of such other parts with'each other andv with parts which previously have been described Equipment for supplying and feeding ribbon D includes a ribbon supply means generally designated E mounted at the right-hand end of the typewriter, and from which the ribbon D is adapted to extend past the printing point to engage and be fed by a feed roll F mounted at the left-hand end of the machine, from whence the ribbon extends to a take-up spool G, the feel roll F and take-up spool G being driven by a driving pulley H interposed between the carriage draw band 5 and the feed roll and take-up spool, respectively. In operation, the driving pulleyH is effective for driving the feed r011 Fand take printing point will correspond to or with the carriage travel so as to assure the positioning of a fresh ribbon portion for each typing impression.

The driving mechanism tends to rotate the takeup spool G at such angular velocity as would cause its effective peripheral velocity to be great: er than the peripheral velocity of the feed roll F. In this way the ribbon D extending between the feed roll F and the take-up roll is maintained taut so as to promote snug winding of the ribbon' on the take-up spool.

Referring more particularly to the details of constructionof the'illustrative embodiment of the invention, the ribbonsupply means E includes a supply spool l2 journaled on a bracket l3 secured as at l4 to the main frame A, The ribbon D-extend's from the supply-roll 12 around a flanged guide roller I 5, and thence through the usual ribbon vibrator l6 and over a guide roller 0 I! journaled on a bracket I 8 secured as at I 8 to a plate [9 fixed by screws to the main frame A at the left-hand end of the typewriter.

The feeding and ribbon take-up mechanism is mounted on a'sheet metal mechanism frame generally-designated 2| mounted at the left-hand end of the frame A by means of posts 22. The frame is provided with a U-shaped bracket portion 23 secured to the frame 2| as at 2424, and having a vertical ear portion 25. A forwardly projecting extension 26 integral with the frame 2| isprovided with a vertically extending ear 21. A sleeve 28 secured to the ear by means of a nut-29 cooperates with the ear 2'! for journaling a shaft 30 which is parallel to the fore-and-aft extending, horizontal axis of the spring barrel 4. The shaft 30 is driven by means to be described later for driving both the feed roll F and the take-up spool G.

The feed roll F is secured by a set screw 3! to a shaft 32 extending transversely to the shaft 30 and journaled in vertical frame'ears 33 and3 l at the end of the frame extension 26. A bevelgear 35 secured to the shaft 32 meshes with a bevel gear 36 secured to the shaft 30 and of the same pitch diameter as the gear-35. Thus, the shaft 32 will be driven at the same angular velocity as the shaft 30, and, since the diameter of the feed roll F is the same as the diameter of the pulley .H, the peripheral velocities of the feed roll and-pulley will beequal.

The ribbon take-up equipment is similar to that disclosed in the copendingapplication of George Handley, Serial No. 359,119, filed Sep tember 30, 1940. It includes the take-up spool G mounted to turn freely on a shaft 37 which is journaled on the frame plate 2| and bracket portion 23. A bevel gear 3B'fixed to the shaft 37 meshes with a bevel gear 39 fixed to the shaft 30. Impositive drive connectionsinterposed between the shaft 31 and the take-up spool G include a serrated or saw-toothed ,wheel40 fast with the take up spool G and adapted to bedriven, by a'slipdrive pawl 4| pivoted as at 42 on an arm "43 secured by a set: screw 44 to thesh'aftfl;

A spring 45 urges the pawl 4| into engagement with the toothed wheel 40 with such radial pressure that, when the shaft 31 and arm 43 are rotated, the take-up spool G will be driven impositively, the effective torque transmitted to the spool G being sufficient to maintain the ribbon D taut. However, the spring 45 will yield so as to permit slippage of the pawl M on the wheel 40 and allow the spool G to lag behind the shaft 31 so as not to exert too strong a pull on the ribbon D. In order to prevent the spool G from moving reversely, it is provided with a finetoothed ratchet wheel 46 which is engaged by a back check pawl 4'! pivoted as at 48 on the verti- -cal frame-ear'25of the frame 2|, the back check pawl being urged into engagement with the ratchet wheel 46 by a spring 49.

In accordance withthe invention, the shaft 30, and, consequently, the feed roll F and take-up spool G are driven from the carriage draw band 5 during letter-spacing travel only. The driving pulley H which engages the -dr-aw=band 5 for effecting the drive is equipped with a bearing bushing 50 journaled on the sleeve 28. The pulley is held against axial displacement on the sleeve-by engagement of one end ofthe bushing 50 with a shoulder 5| formed on the sleeve, and by engagement of the other end of the bushing with a retaining washer 52 staked or otherwise suitably secured to the sleeve. For promoting smooth and dependable driving of the pulley H, it is provided with a rubber covering 53 which is contacted by the draw band 5.

The ribbon-feeding and take-up equipment is mounted outwardly beyond the left-hand end of the frame A, being thus easily attachable as a unit without revising the arrangement of the standardtypewriter parts, For effecting operative driving connection between the draw band 5 and the ribbon-feeding and take-up mechanism without substantially changing the arrangement of the standardtypewriter parts, an intervening portion of the draw band 5 is arranged to extend generally to the left to the driving pulley H, thence vertically upwardly to a flanged guide roller 54 journaled as at55 on a frame ear 56, and thence another intervening portion extends to' the right directly overbut out of contact with the spring barrel 4 for connection to the carriage B as at 57.

When the carriage moves in the letter-spacing direction, the draw band 5 will travel in the direction of the arrow a, and the spring barrel 4 and the pulley H will be rotated counterclockwise as viewed in Figure 2.- Conversely, when the carriage moves in the return direction, or to the right, the spring barrel 4 and pulley H will rotate clockwise as-viewed in Figure 2. Inasmuch as it is desiredto feed the ribbon D in the direction of the arrow 17 and rotate the take-up spool in the direction of the arrow 0 only during carriage letter spacing movements and counterclockwise rotation'of the barrel 4 and pulley H, a one-way drive connection is interposed between the pulley H and the shaft 30. The one-way drive connection'shown herein is similar to that disclosed in the copending application Serial No. 359,119 referred to -above.'-It includes a spring pawl 58 riveted as at 59'to the pulley H, and normally being engageablewith a toothed ratchet wheel 60 which is free on the shaft 30but is adapted to be-held in driving connection therewith by apin B-l fixed-to the wheel 80 and-extending into a slot 62 in a collar-63 secured-by a set: screw 64- to the sh'aft 3fl. 'A spring 65 interposed between the collar 63 and the ratchet wheel 66 normally holds the ratchet wheel close to the pulley H for cooperation with the spring pawl 58, so that, when the pulley H rotates counterclockwise as viewed in Figure 2, the shaft 30 will be rotated so as to drive the feed roll F and take-up spool G. When the driving pulley H is rotated clockwise during return travel of the carriage, the pawl 58 will slip over the teeth of the ratchet wheel 60 so as not to drive the shaft 30, the feed roll F, and take-up spool G.

When the carriage is moved in the letterspacing direction during tabulating operations, it is unnecessary and is wasteful to feed ribbon correspondingly, and it therefore is desirable to disable the ratchet or clutch device 58-60 during tabulating operations. For accomplishing this, a pin 66 mounted on a lever 61 pivoted as at 68 on the frame plate M is movable against a flange 69 on the ratchet Wheel 60 for pulling the ratchet wheel away from the spring finger 58. A spring I0, however, normally maintains the lever 61 and pin 66 in positions permitting the spring 65 to hold the ratchet wheel 60 in position for engagement by the spring finger 58. The lever 61 may be operated in unison with the tabulating mechanism by means of a pull link H adapted to be connected to the tabulating mechanism by means such as are disclosed in the copending application 359,119 previously referred to.

The mechanism disclosed herein embodies the invention in the form now preferred, but it will be apparent that changes may be made without departing from the invention as defined in the claims.

I claim:

1. A ribbon feeding attachment for a typewriter including a main frame having end walls, a carriage mounted on said frame for letter spacing and return travel, a motor driven barrel journaled on said frame intermediate said end walls to rotate about an axis transverse to the direction of carriage travel, and a carriage draw band secured respectively to said barrel and said carriage; said attachment comprising a mechanism frame adapted to be mounted on said main frame outwardly beyond that end wall of said frame towards which said carriage moves during carriage letter-spacing travel, ribbon feeding mechanism mounted on said mechanism frame and including a drive pulley, and means so journaling said pulley on said mechanism frame that when the attachment is applied to the typewriter the pulley will be rotatable about an axis parallel to said barrel axis and outwardly beyond that end wall of said main frame towards which the carriage moves during letter-spacing travel, said pulley being adapted to be engaged by the carriage draw band with the latter having a portion extending from said barrel generally in the direction of carriage letter-spacing movement to and in driving contact with said pulley and another portion extending from said pulley and in the direction of carriage return movement to the point of attachment of the band to the carriage.

2. A ribbon feeding attachment for a typewriter including a main frame having end walls, a carriage mounted on said frame to move to the left for letter spacing and to the right for return travel, a spring barrel journaled on said frame to-rotate about a horizontal axis extending fore-and-aft of the typewriter and disposed between the right and left end walls of the main frame, and a carriage draw band secured respectively to said barrel and said carriage; said attachment comprising a mechanism frame adapted to be mounted on said main frame outwardly beyond the left end wall thereof, ribbon feeding mechanism mounted on said mechanism frame and including a drive pulley, a guide roller and means so journaling said pulley and roller on said mechanism frame that when said attachment is applied to the tyepwriter the pulley and roller will be rotatable respectively about spaced axes parallel to said barrel axis outwardly beyond the left end wall of said main frame, the pulley and roller being so positioned as to be engaged by the draw band with the latter extending from said spring barrel to the left to and in peripheral contact with the pulley, thence extending upwardly and in peripheral contact with said roller, and thence extending to .the right above and out of contact with said spring barrel and to the point of attachment to said carriage.

GEORGE F. HANDLEY.

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