US1957322A - Typewriting machine - Google Patents

Description

May 1, 1934.

C W. CRUMRINE TYPEWRITING MACHINE Filed March 5, 1951 mN RN 5 EN Q mm VN QM INVENTOR CHESTER W. CRUNRlNE ATTORNEY Patented May 1, 1934 UNITED STATES TYPEWRITING MACHINE Chester W. Crumrine, Rochester, N.

to Electromatic Typewriters, Inc., N. Y., a corporation of New York Y., assignor Rochester,

Application March 5, 1931, Serial No. 520,240

4 Claims.

This invention relates to improvements in typewriting machines, and particularly to devices for automatically rotating the platen for advancing the work sheet from line to line when the car- 5 riage is returned for beginning a new line of writing.

The principal object of this invention is to provide simple and inexpensive means for slowly advancing the platen from line to line while the carriage is rapidly returned by power driven devices.

Another object of the invention is to so connect the line spacing devices of a typewriting machine with the power devices for returning the carriage that the former are moved only a fraction of the distance of the latter during a given interval of time.

A still further object of the invention is the provision of simple line spacing devices comprising but few parts which are positive in action and automatically operated by devices for returning the carriage.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear from the following description when read in conjunction with the accompanying drawing, the novel features being pointed out in the claims at the end of the specification.

In the drawing:

Fig. 1 is a fragmentary view in elevation of the left hand end of a typewriter carriage illustrating one embodiment of the present invention:

Fig. 2 is a transverse section of the same, taken substantially on line 2-2 of Fig. 1 and looking 5 in the direction of the arrow at said line, this view also showing power actuated devices for operating the machine, and

Fig.3 is a section on line 3-3 of Fig. 1 looking in the direction of the arrow at said line, the

40 platen and its ratchet wheel being omitted.

Referring particularly to the drawing, 1 represents the frame of the machine on which a carriage 2 is movable transversely for letter spacing. Interposed between the carriage and the frame are the usual anti-friction bearings 3. The carriage is propelled in letter space direction by a spring motor 4 connected to the carriage by a tape 5, which movement is controlled by escapement devices in a manner well understood by those skilled in the art.

Key controlled power actuated means are provided for returning the carriage after completing a line of writing for beginning a new line. Said means comprise a tape or cord 6 secured at one end as at '7 to the carriage, and at its other end connected to the core of a spool 8, loosely mounted on the shaft 9 of a power driven roller. Devices comprising a clutch for connecting the spool with the roller and a key controlled cam 10 are provided for operatively connecting and dis- 6O connecting the spool with the power driven roller. Since the devices for operating the carriage return mechanism are or may be of usual construction, detailed description thereof is deemed unnecessary here. The tape 6 extends from the spool 8 over an idler fixed to the machine frame, thence over a pulley 11 on the carriage to the bracket 7. By this arrangement, when the spool 8 is operatively connected with the power roller to wind the tape 6 thereon, the carriage is moved to the right for beginning a new line.

After the completion of a line of writing and before a new line is started, it is necessary to turn the platen to feed the work forwardly a distance of one line space, which may be a single, double or treble space, as may be required by the character of the work being written. In a power operated machine, it is particularly desirable that such line spacing operation be performed automatically when the carriage is being returned and without imposing an overload on the carriage return devices. To this end, the pulley 11 is mounted on a line space actuator comprising an arm 12 of a bell crank lever pivoted on the carriage and on which the pulley 11 is mounted, the 5 other arm 13 of the bell crank being operatively connected with devices for turning the platen 14 revolubly mounted in the carriage frame. 'The bell crank is pivoted on a bracket 15 secured to the carriage frame, and its arm 12 projects downwardly therefrom through an elongated slot provided therefor in the carriage frame. A spring 16 resiliently connects the arm 12 with the frame of the carriage and operates to return the bell crank to normal position when the tension on the carriage return tape is released. It will be noted that by this construction, when the carriage return devices are actuated, 'the tape 6 is operative to actuate the line spacing devices, but since the tape passes over the pulley 11, the arm 12 and arm 13 which operates the line spacing devices move only one-half as fast as the tape or the carriage to which one end of the tape is attached, so that the line spacing devices are actuated slowly and without shock, and the tendency to disarran'ge a plurality of work sheets with carbons between them is eliminated. ,The movement of the carriage under the action of the carriage return devices is limited by the usual margin stop devices, and by properly arranging the relative strength of the springs, theline spacing operation takes place at the beginning of the carriage return operation.

The free end of the arm 13 is slotted or bifurcated at 17, whereby it engages a lug or finger 18 projecting forwardly from the lower end of a carrier 19 sliclably mounted on brackets 20 and 21 projecting from the carriage frame. The carrier 19 is provided with relatively inclined slots 22 and 23 whereby itis slidably mounted on the brackets. From an inspection of Fig. 2, it will be noted that when .the arm 13 is actuated the carrier not only slides in a vertical plane on the brackets but is also oscillated about a horizontal axis, so that when it moves downwardly, it swings in an arc substantially concentric with the axis of the platen.

Pivotally mounted on the carrier 19 is a pawl 24 arranged to engage one or another of the teeth on a ratchet wheel 25 secured to the end of the platen to rotate therewith. Normally the pawl is out of engagement with the platen, as seen in Fig. 2, with a tail piece 26 at its upper forward end engaging an arm 27 projecting forwardly from the carriage frame. A spring 28 connects the upper or end tail of the pawl with the carrier 19 and tends to swing the pawl into engagement with the ratchet wheel or with the arm 27. The arm 27 is pivoted at 27 on the frame of the carriage and extends forwardly therefrom. A spring 29 associated with its pivot is operative to swing it upwardly against a lug 30 projecting laterally from an arm 31 pivotally mounted on the bracket 21. The upper edge of the arm 27 is provided with a plurality of recesses 32, 33 and 34, with one of which the lug 30 engages. When the parts are in the position shown in Fig. 2, and the lug 30 engages the recess 32, the engagement of the pawl with the arm 27 limits the upward movement of the carrier, and an actuation of the arm 13 is operative to move the carrier downwardly, which carries the pawl away from the arm 27 and permits its spring to operate to swing it into engagement with the ratchet wheel; further movement of the carrier swings it on its brackets in a curved path, due to the inclination of its slots, and turns the platen with it until it reaches the limit of its movement when the pawl engages a stop 36 projecting from the carriage frame and locks the pawl into engagement with the ratchet wheel and prevents overthrow of the platen. When ,the arm 13 moves on the return stroke under the action of the spring 16, the carrier moves vertically and the pawl rides idly over the teeth of the ratchet wheel until its upperor tail end engages the arm 27 which swings it out of engagement with the ratchet wheel, which engagement is also operative to limit the upward or return movement of the carrier. A projection 35 on the pawl engages the carrier and limits the. pivotal movement of the pawl under the action of the arm 27. With the parts in the position shown in Fig. 2 of the drawing, the platen will be turned forward one tooth of the ratchet or a single line space at each actuation of the carrier. When the arm 31 is moved to engage its lug 30 with the depression 33, the arm 27 moves upwardly under thetension .of its spring and permits the carrier 19 to also move upwardly thus increasing its stroke under the action of the arm 13, and the platen is turned two ratchet teeth or a double line space. When the arm 31 is moved still further to the rear to engage its lug with the depression 34 in the arm 27, the arm and the carrier are elevated still further and an actuation of the arm 13 is operative to turn the platen through a distance of three teeth of the ratchet wheel for trebled line spacing. The usual detent 25 resiliently engages the teeth of the ratchet wheel and retains the platen against accidental rotation. It will be noted that the line spacing devices are conveniently arranged to the rear, and beneath the platen, so that the latter may be readily removed without disturbing them.

Briefly the operation is as follows. When the carriage return devices are actuated, the pulley 11 ,moves relatively'to the carriage'to effect line spacing asthe carriage begins its return movement to the right, and at the limit of the line spacing movement the carriage moves to the right at a greater speed than that of the pulley 11 when moving for line spacing. This movement of the pulley 11 on the carriage tensions the spring 16 and depresses the carrier 19. As the carrier moves downwardly, the upper end of the pawl moves away from the stop arm 27 and its spring 28 swingsit into engagement with the ratchet wheel. movement of the carrier moves the pawl to turn the platen through an arc of one, two or three teeth of the ratchet wheel, depending on the position of the arm 31. At the limit of the downward movement of the carrier, the pawl engages the stop 36 on the carriage which locks it in engagement with the ratchet wheel and prevents overthrow of the platen.

Although only one embodiment of the invention is shown and described herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claims.

I claim:

1. In a typewriting machine, the combination of a frame, a carriage movable thereon, means for moving the carriage for letter spacing, key controlled means for returning the carriage for a new line, a platen revolubly mounted on the carriage, a carrier having a plurality of relatively inclined slots whereby it is mounted on the carriage for a sliding and swinging movement thereon, pawl and ratchet devices actuate-:1 by said carrier for turning the platen for line spacing, and a movable device actuated by said key controlled means for actuating the carrier.

2. Ina typewriting machine, the combination of a frame, a carriage movable thereon, means for moving the carriage for letter spacing, key controlled means for returning the carriage for a new line, a platen revolubly mounted on the carriage, a carrier mounted on the carriage for a sliding'and swinging movement thereon, pawl and ratchet devices actuated by said carrier for turning the platen for line spacing, means actuated by said key controlled means for operating the carrier, a pivoted arm for limiting the movement of the carrier, and means for adjusting said arm to vary the stroke of the carrier to vary the extent of rotation imparted to the platen.

3. In a typewriting machine, the combination of a frame, a carriage movable thereon for letter spacing, a revoluble platen on the carriage, power driven means for returning the carriage to begin a new line, line spacing devices for turning the platen for line spacing, a bell crank lever pivoted on the carriage and having one arm operatively connected with the line spac- Further ing devices, a pulley mounted on the other arm, and a flexible connection from the power driven means extending around said pulley and having one end secured to a fixed part of the carriage, said pulley and the arm on which it is mounted being movable relatively to the carriage in the same direction of movement as the flexible connection whereby the rate of movement of the bell crank lever and of the line spacing devices is less than the rate of movement of the fiexible connection.

4. In a typewriting machine, the combination of a frame, a carriage movable thereon for letter spacing, a revoluble platen on the carriage, power driven means for returning the carriage to begin a new line, line spacing devices for turning the platen for line spacing, a. bell crank lever pivoted on the carriage adjacent to one end thereof and having one arm operatively connected with the line spacing devices, a pulley on the other arm of said bell crank lever, said pulley and the arm on which it is mounted being movable relatively to the carriage and endwise thereof, and a flexible cord connecting said power driven means with the carriage and having one end secured to a fixed part of the carriage, s'aid cord extending around the aforementioned pulley and the ends of the cord both being located on the same side of the pulley whereby a given movement of the cord effects a slower movement of the pulley and the arm on which it is mounted.

CHESTER W. CRUMRINE.

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