US2486901A - First line position determining means for typewriting machines - Google Patents

Description

Nov. 1 1949 Filed March sp, 1946 E. wl 2,486,901 FIRST LINE POSITION DETERMINING MEANS FOR TYPEWRITING MACHINES 5 Sheets-Sheet 1 ATTORNEY E. L. WISE FIRST LINE .POSITION DETERM Nov., l, '1949 INING 2,486,901

MEANS Fox TYPEWRITING MACHINES Filed March 30, 1946 3 Sheets-Sheet 2 /N VENTOR ELMER Lw/sf Nov. l, 1949 E. L. wis

LINE POSITION FOR TYPEWRITI E l DETERMIN ING NG MACHINES I ST ANS

3 Sheets-Sheet 3 Filed March so, 1946 /a 3 @my f7 5 Wl Si@ mw I4 MT w w 3 w Owl/@Nl l /IZZ /NvENTo/re ELER L.w1s5

Patented Nov. 1, 1949 FIRST LINE POSITION DETERIVIINING MEANS FOR TYPEWRITING MACHINES Elmer L. Wise, Bridgeport, Conn., assignor to Underwood Corporation, New York, N. Y., a

corporation of Delaware Application March 30, 1946, Serial No. 658,494

Claims. 1

This invention relates to typewriting machines and to typewriting and accounting machines and more particularly to machines of the so-called Elliott-Fisher type. Machines of this type are usually provided with a substantially rigid platen frame and with a substantially at platen mounted for vertical movement in said frame to clamp and releaseV the work. A line space frame is mounted on the platen frame for forward and rearward movement on tracks supported by the side bars of the platen frame. In such machines the type bars are carried by a type head mounted on front and rear rails carried by the line space frame for movement in one direction to letter space and in the opposite direction to return the type head to position to start a line of writing.

Certain machines of this type, such as those used in hotel work, are provided with a at platen having an upper layer of relatively hard resilient material such as hard rubber in which is inserted a metal plate having a limited area as compared with the entire area of the platen. This plate is located on the platen in a position particularly convenient for the operation of the machine and its upper surface is substantially fiush with the upper surface of the remainder of the platen. The plate is of such a size as will conveniently receive and support small sized forms such as are employed in hotels for recording patrons charges, and provides a suitably resistant durable printing surface to withstand the frequent blows of the type in a restricted area of the platen. In order to locate the forms in a predetermined position with relation to the rear edge of the metal plate, a metal strip is attached to the upper surface of the platen adjacent the rear margin of the plate, its forward edge constituting a gage against which the forms are located before typing.

Usually, in machines of this character, the location of the line space iframe in position for the writing of the single line, or the first line of two or more to be typed, is left to the judgment of the operator. Frequently the operator errs in his judgment with the result that the types strike the forward edge portion of the gage strip with re' sulant injury to the types.

The principal object of the present invention is to produce a novel and improved construction for machines of the above character by which the line space frame may be quickly and easily located accurately in proper position, forwardly and rearwardly of the platen, for the writing of a single line or the rst line of two or more lines on a work sheet placed in a predetermined position on the platen.

Another object of the invention is to provide machines of the above type having a gage for locating a work sheet in a predetermined position forwardly and rearwardly of the platen with stop devices of novel and improved construction for limiting the forward movement of the line space frame to locate the type head in proper position for the Writing of the first line.

With the above and other objects in view, the invention consists in a machine embodying the novel and improved features, constructions and combinations of parts hereinafter described and particularly pointed out in the claims, the advantages of which will be readily understood and appreciated by those skilled in the art.

The invention will be clearly understood from the accompanying drawings illustrating amachine embodying the invention in Iits preferred form and the following detailed description of the construction therein shown.

In the drawings:

Figure 1 is a plan View of a machine embodying the invention with the type head shown in dot and dash lines and with a portion of the line space frame and certain associated parts removed,

Figure 2 is a view in vertical section illustrating the platen frame, the platen, the line space frame and certain associated parts and also illustrating the lower left-hand portion of the type head,

Figure 3 is a detail view in front elevation partly broken away and partly in section illustrating a portion of the mechanism for actuating the line space frame from the type carriage during the last part of the carriage return movement and showing the parts in the positions which they assume at the end of a carriage return movement,

Figure 4 is a View in side elevation partly broken away and illustrating certain parts of the line space mechanism in the positions which they assume at the end of the return movement of the carriage.

Figure 5 is a detail View in side elevation illustrating certain parts of the line space mechanism and certain parts of the mechanism for limiting the forward movement of the line space frame with relation to the platen to determine the position of the rst line of typing,

Figure 6 is a view in front elevation of the mechanism shown in Figure 5 with the front rail illustrated in dot-and-dash lines,

Figure 7 is a View similar to Figure 6, illustrating certain of the parts in diiferent positions,

Figure 8 is a detail view in vertical section illustrating certain parts of the mechanism for limiting the forward movement of the line space frame, and

Figure 9 is a view similar to Figure 8 illustrating certain of the parts in different positions.

The invention is illustrated and described in this application as embodied in a machine of the type shown in applicants Patent No. 2,248,152, dated July 8, 1941, and many of the parts have substantially the same construction as the corresponding parts disclosed in said patent.

The machine illustrated in the present application comprises a platen frame provided with side rails or bars 2 connected by transverse bars, indicated at 4, and a substantially at platen 6 mounted for vertical movement in said frame. Upon the side rails of the platen frame is supported a line space frame movable forwardly and rearwardly on said rails to line space the type carriage with relation to the platen. The line space frame comprises side brackets or bars 8 connected by front and rear rails I and I I. The line space frame is provided with Wheels or rollers I2 and I3 which engage respectively the upper edges'of the rails 2 of the platen frame to enable the line space frame to be moved readily over the platen frame.

The mechanism for moving the line space frame comprises a shaft I4 rotatably mounted in bearings formed on said frame, to which shaft the rollers I2 are fixed, the shaft extending substantially parallel with the front and rear rails of the frame. Upon the shaft are fixed gears I6 which mesh with the teeth of racks I8 secured to the side rails 2 of the platen frame. The shaft is given a predetermined angular movement in a counterclockwise direction, Figure 4, at the end of the return movement of the carriage to impart a line space movement to the line space frame.

The type carriage, shown in dot-and-dash lines in Figure 1 and a portion of which is illustrated in Figure 2 and indicated at 26, is provided with wheels or rollers 22 which engage the upper edges of the front and rear rails of the line space frame so that the carriage is movable transversely of the machine along said rails to impart advance and return movements to the carriage. The carriage is connected by a exible band 23 to the usual spring drum 24 which tends constantly to draw the carriage in a right hand or advance direction across the machine.

The machine embodying the present invention is preferably provided with power operated mechanism for imparting return movements to the carriage and with mechanism for arresting the return movements of the carriage with the carriage in fully returned or in partially returned position having substantially the same construction arrangement and mode of operation as the corresponding mechanisms illustrated and described in the patent to Sundstrand No. 2,283,401, dated May 19, 1942.

The mechanism for turning the shaft I4 to actuate the line space frame comprises a wheel 26 attached to one end of said shaft and having a series of flne teeth on its periphery which are engaged at intervals by a pawl 28 pivoted at 36 on a pawl carrier 32 mounted to turn on the shaft. .A pawl actuating bell crank 34 is also pivoted on said shaft and is provided with a pin or stud 36 on one arm thereof engaging in a slot 38 in the outer portion of the pawl. The pivotal movement of the pawl 28 with relation to the pawl carrier 32 in a clockwise direction, Fig. 4, is limited by means of a pin 40 projecting from the pawl carrier and engaging in a recess 42 in the lower portion of the pawl. The pawl carrier and the pawl actuator are acted upon respectively by coiled springs 44' which tend to swing the carrier and actuator in a clockwise direction, Figure 4. The pawl carrier and pawl actuator are normally held in position with the pawl in engagement with a stop 46 on the line space frame and the pawl is thereby held out of engagement with the toothed Wheel 26.

In actuating the toothed Wheel, the pawl actuator 34 is swung in a counter-clockwise direction, Figure 4. During this movement of the actuator the pawl is first engaged with the toothed wheel and the pawl carrier and toothed wheel are then turned with the pawl actuator until the movement of the pawl is arrested. The movement of the pawl is arrested to limit the line space movement by means of a stop pin 48 mounted on a bracket 50 attached to the line space frame and arranged to engage the forward side of the pawl as shown in Figure 4. The engagement of the pawl with the toothed wheel 26 after the movement of the pawl is arrested, locks the line space frame in position.

The pawl actuator is swung in counter-clockwise direction, Figure 4, to actuate the shaft I4 to impart a forward movement to the line space frame just before the completion of each return movement of the carriage from the movement of the carriage.

The mechanism for actuating the pawl actuator 34 from the carriage will now be described. The other arm of the pawl actuator is connected by a link 52 with one end of a lever 54 secured to the rear end of a rock shaft 56 mounted in bearings in the line space frame and extending toward the front of said frame. The other end of said lever is connected by a link 58 with an arm 60 secured to the rear end of a relatively short rock shaft 62 also mounted in bearings in the line space frame.

To the forward end of the shaft 62 is secured an arm 64 which is connected by means of a coil spring 66 with the lower arm of a lever 68 pivoted to turn freely on the forward end of the shaft 62. The upper arm of the lever 68 is provided with a forwardly turned contact flange 'I6 which is arranged to be engaged by a pin 'I2 carried at the left hand end of an actuating pawl or dog 'I4 pivoted on a stud I6 secured upon a plate 'I8 forming a slide mounted on the line space frame and movable transversely of said frame. The dog 'I4 is acted upon by a coiled spring which tends to swing the left hand end thereof downwardly to carry the pin I2 into operative position with relation to the contact flange 'I0 on the lever 68, the movement of the pawl under the action of the spring being limited by means of a pin 82 projecting from a plate 84 secured to the slide 'I8 as shown in Figure 2, said plate being located in spaced relation to the slide.

During the entire movement of the carriage, except the first part of the advance movement and the last part of the return movement thereof, the slide 'I8 is held substantially in the position shown in Figure 2. After the first part of the advance movement of the carriage and during the entire return movement thereof, the dog 'I4 is maintained by the spring 80 substantially in the position shown in said ligure. As the carriage executes the last part of its return movement, the slide 'I8 is moved to the left with the carriage and through the engagement of the pin 'I2 on the dog 'I4 with the contact flange 'I0 on the lever 68 the lever is actuated to impart a line spacing movement to the pawl carrier 32 through the connections described. During the first part of the advance movement of the carriage, slide 18 is moved back to the right to its normal position by a spring hereinafter described. The slide 18 is provided with parallel guide slots 86 and 88 in which engage respectively a guide stud 90 and the shaft S2 and the plate is held in position on the guide stud and shaft by means of holding plates or washers 94 and 96, The movement of the slide 18 toward the left is stopped by the engagement of the left hand end of a projection or beak 95 on the slide with a Xed stop 91 rigidly secured to the right hand end of the rear rail II.

The mechanism for moving the slide to the left from the position shown in Figure 2 during the last part of the return movement of the carriage comprises a draft rod 98 which extends transversely of the line space frame in a channel formed by the front face of the rear rail I I and rear face of the carriage escapement rack |00. The right hand end of the draft rod 90 is connected by means of an attaching plate |02 to the slide 18. The left hand end of the draft rod is attached by means of a box nut 99 to a laterally bent portion of a guide plate I| provided with slots |03 in which engage headed fastenings |05 threaded into the carriage escapement rack, this guide plate moving longitudinally with the draft rod during the longitudinal movement of said rod.

A spring |01 anchored at One end to the fixed stop 91 and connected at its opposite end to the draft rod 08 yieldingly retains normally the slide 18 and the draft rod at their right hand limits of travel as determined by contact of the left end wall of the slot 86 with the guide stud 90 and moves them back to these positions, during the first part of the advance movement of the carriage.

The left hand end portion of the draft rod 98 is provided with teeth upon its upper face and upon the draft rod are mounted a series of arresters |04, |06 and |08 of different heights engaging said teeth and adjustably arranged on the rod at different distances from the left hand end thereof. IThe arrester |04 having the greatest height and located nearest the left hand end of the draft rod is arranged to be engaged by the abutment plate Il0 secured to the carriage 20 to arrest the carriage at the end of a full return movement thereof. The arresters |06 and |08 are arranged to be engaged alternatively by means of a check stop II2 mounted on the carrage and protrudable to different positions to engage selectively the said arresters at different points in the return movement of the carriage. Thus the return movement of the carriage will be arrested with the carriage in different positions respectively by the engagement of the abutment plate I|0 with the arrester |04 and by the engagement of the protrudable check stop |I2 with the arresters and |08.

As the carriage approaches the end of its return movement the abutment plate IIO on the carriage engages the arrester |04 or the check stop II2 engages one of the arresters |06 and |08 and the draft rod is moved to the left with the carriage thereby carrying the slide 18 therewith and the carriage is finally arrested by the engagement of the projection 95 on the slide with the stop 91 which arrests the movement of the slide and the draft rod. During this movement of the slide the line space mechanism is actuated through the mechanism described to impart a line space movement to the line space frame.

y movement to the line space frame.

When aline space movement has been imparted to the line space frame, the movement of the frame is stopped by the engagement of the line space pawl 28 with the stop pin 48 to prevent overrunning of the frame and the frame is locked by the engagement of the pawl with the toothed wheel 26. During the rst escapement movement of the carriage, the dog 14 is lifted to disengage the pin 12 from the lever 88 and thereby release the line space mechanism and unlock the line space frame by mechanism disclosed in applicants Patent No. 2,248,152 which need not be described herein.

With the mechanism above described, the shaft I4 may be turned in a counterclockwise direction, Figure 4, to impart a line spacing movement to the line space frame by the last part of the return movement of the carriage imparted by the operator or by the carriage return drive mechanism.

All of the mechanisms of the machine above described preferably have substantially the same construction, arrangement and mode of operation as the corresponding mechanisms of the machine illustrated and described in applicants patent referred to above.

The rock shaft 56 is arranged to be operated manually to swing the pawl actuating bell crank 34 in a counter-clockwise direction, Figure 4, to operate the shaft I4 to impart a line spacing To this end an operating arm I|3 is fixed to the forward end of the rock shaft for actuation by the operator.

The machine is also provided with type bar mechanism mounted on the carriage 20 and preferably having substantially the same construction, arrangement and mode of operation of parts as the type bar mechanism shown and described in the patent to Sundstrand, No. 2,239,023, dated April 22, 1941.

The platen 6 preferably embodies an upper layer II4 of comparatively hard resilient material such as hard rubber. In order to provide a covering having a greater resistance to wear under the repeated blows of the type over a restricted area, the upper layer of rubber is omitted over a certain area of the platen and a plate II5 of substantially the same thickness as the hard rubber layer is attached to the lower supporting layer of the platen with its upper surface substantially ush with the upper surface of the rubber layer. This plate is constructed of such a size that it will receive and support for printing the small sized forms commonly employed in hotels for recording patrons charges.

In order to locate each of these forms in a predetermined position, forwardly and rearwardly of the platen, a relatively narrow gage strip I|6 preferably of metal is fixed to the upper surface of the platen with its forward edge in predetermined pcsition with relation to the plate I I5. As shown the forward edge of the gage strip is located substantially above and in line with the rear edge of the plate I I5.

The platen frame is provided with the usual clamping strips I I8 and |20 attached respectively to the side bars 2 of said frame and arranged to overlie the lateral margins of the platen to clamp the side edge portions of a work sheet.

Usually in hotel work, only a single line of typing is imprinted on the small forms. The positioning of the line space frame forwardly and rearwardly of the platen is, as above indicated, ordinarily left to the judgment of the operator. The result is that said frame is often erroneously positioned and sometimes the frame is placed so far back that the types strike the gage strip I I6 with resultant injury to the types.

In some cases, the entries to be made on the hotel slip require two or more lines of typing and it is therefore desirable to be able conveniently to type two or more lines. The present invention enables these results to be secured. In actual practice, after the completion of the typing of a work piece, the line space frame is pushed back manually beyond the gage strip ||6, the typed work piece is removed and a new form is placed in position with its left edge portion beneath the clamping strip IIS and in engagement with the inner surface of the left platen rail 2, and with its rear edge in engagement With the fo-rward edge of the gage strip ||6. 'I'he line space frame is then drawn forward manually into position for writing the single line or the rst line on the new slip which is usually placed quite close to the upper edge of the for-m.

In order to locate the line space frame and the type head in position for the writing of the first line, a stop member |22 is fixed to the outer side of the right hand platen rail 2 and is arranged to be engaged 'by a stop member |24 carried by the line space frame.

The stop member |22 :consists of an angularly bent bracket one arm of which is fixed adjustabily to the outer side of the right hand rail of the platen frame and the other arm of which projects outwardly at substantially a right angle to the said side rail.

The first writing line is subject to variations to suit different users of the machine and to enable the position of the first writing line to be varied, means is provided for adjusting the stop member |22 forwardly and rearwardly on the side rail 2. The member |22 is secured to the side rail by means of screws |25 and |26 passing through the arm thereof attached to the side rail 2. The screw |25 passes through a horizontal slot |27 in said stop member and is threaded into the side rail. The screw |26 passes through an eccentric sleeve |28 and through a vertical slot |30 in the stop member and is threaded into the rail. The inner portion of the sleeve |28 which is eccentric to screw |26 engages in the slot |3Il` and the eccentric is formed with an outer or head portion concentric with the head of the screw. Thus by loosening the screws |25 and |26 and rotating the eccentric |28, the member |22 may be adjusted forwardly or rearwardly on the platen rail.

The stop member |24 is pivoted by means of a shouldered screw |32 upon a laterally bent flange |34 on an arm |36 fixed to the rock shaft 56 just to the rear of the operating arm I I3. The member |24 is acted upon by a spring |39 mounted in a bore in said member and engaging a pin |38 slidably mounted in said bore and having its outer end in engagement with the body of arm |36. This spring holds the member normally in the operating or stop position shown inFigure 8 with a shoulder |46 adjacent the lower end of the stop member in engagement with the body of the arm |36. Figure 1 shows, in dot and dash lines, one type bar in the position that it assumes when the type on the corresponding type head engages the work in printing a letter or gure on the rst line of the form, the type bar being indicated at I4I.

The rock shaft 56 is acted upon by a spring |42 coiled about the shaft. One end of this spring is anchored in a fixed boss |43 through which the shaft passes and the other is attached to a collar |44 fixed to the shaft. This spring tends to turn the shaft in a counterclockwise direction, Figures 6 and 7, and to maintain the arm |36 in the position shown in Figure 6 with relation to the stop bracket |22.

The rock shaft 56 is normally held by the action of the springs 44 and the spring |42 in position to maintain the arm |36 in the angular position shown in Figures 5 and 6. Before the line space frame is moved forward to start a line of typing, the arm |36 and stop member |24 are located some distance to the rear of the stop member |22 by the locating of the line space frame in position for the insertion and removal of the work slips, As the line space frame is drawn forward after the insertion 0f a slip to be typed, the stop member |24 engages the arm of the stop member |22 projecting outward from the right hand platen rail as shown in Figures 5, 6 and 8 and stops the forward movement of the line space frame to locate the type bar mechanism in position for typing the rst line.

In order to support the arm I 36 against the force exerted on the same tending to bend the same laterally as the stop member |24 engages the stop member |22, a bracket |45 is fixed by screws |46 to the front rail I0 of the line spacev frame. This bracket has a portion thereof bent in a U-shape as shown in Figure 5 and is formed with an arm |41 substantially parallel with the body of the bracket for engaging the rear face of the arm |36.

The stopping of the forward movement of the line space frame in this manner locates the type head in directions forwardly and rearwardly of the platen in position for writing the first line upon the hotel slip. After writing the line, the line space frame is ordinarily pushed back by the operator and the type head is moved back to the left ready to start another line of typing either manually or by the carriage return mechanism.

It is frequently desirable to write two or more 7 lines of typing on the hotel slip. To position the line space frame for typing the second line, the shaft I4 is turned in a counterclockwise direction, Figure 4. This may be done by swinging the operating arm I3 downwardly from the position shown in Figure 6 to that shown in Figure 7 and thereby actuating correspondingly the shaft I4. The line spacing movement of the shaft I4 may also be produced by the return movement of the carriage through the engagement of a stop in the carriage with one of the arresters |64, |06 or |08 and a movement of the draft rod 98 to the left thereby produced. This operation also rocks the shaft 56 in a clockwise direction. The parts are constructed and arranged so that the rst part of the angular movement of the rock shaft 56 swings the arm |36 upward to carry the stop member |24 above the outwardly exten-ding portion of stop bracket |22 and after this occurs, the pawl 28 is engaged with the toothed wheel 26 and the shaft I4 is turned to move forward the line space frame a distance of one line space.

This movement of the line space frame carries forwardly the stop member |24 or at least the forward acting portion of said member ahead of the laterally projecting arm of stop bracket |22 and the line spacing mechanism will operate in the usual way, after printing the second and succeeding lines.

After a slip containing two or more lines of typing has been completed, the line space' frame is pushed back t the usual rear position before removing the slip. During this rearward movement of the frame, the inclined face |48 on the stop member |24 engages the laterally projecting arm on the stop bracket |22 and stop mem- [ber |24 is swung about the stud |32 until is bypasses the bracket |22. After the stop member passes the bracket, said member is swung back in a counterclockwise direction, Figures 8 and 9, about the stud |32 by the action of the spring |39 until the shoulder |40 is engaged with the arm |36. The stop member is then again in position to limit the forward movement of the line space frame by the engagement of the lower end thereof with the laterally projecting arm of stop bracket |22.

With this construction, the line space frame may be quickly and accurately located in position for the writing of the flrst line without requiring any judgment on the part of the operator. Then, if two or more lines are to be written, the stopping devices are moved relatively out of stopping positions in the regular operation of the line space mechanism before the line spacing action and the line space frame is then line spaced as usual. The relative shifting of the stopping devices and the movement of the line space frame may be produced either by the direct manual operation of the line spacing rock shaft or by the return movement of the carriage effected manually or by the action of the carriage return mechanism.

It is to be understood that, except as defined in the claims, the invention is not limited to the particular construction and arrangement o-f parts of the illustrated embodiment of the invention but that the invention may be embodied in other forms within the scope of the claims.

Having explained the nature and object of the invention and having specifically described a construction embodying the invention in its preferred form, what .is claimed is:

1. A typewriting machine comprising a platen frame, a substantially flat platen mounted in said frame, a line space frame supported on said platen frame for forward and rearward movement over the platen to line space, a type carriage mounted on said line space frame for movement in one direction to letter space and in the opposite direction to return said carriage, type mechanism carried by said carriage for engaging a work sheet supported on the platen, stopping devices mounted respectively on the platen frame and on the line space frame for engagement to limit the forward movement of the line space frame to locate the type carriage in position for writing the first line, line spacing means operated by the return movement of the carriage to move the line space frame forwardly one line space in each operation of said means and means operated by said line spacing means during its line spacing movement to move the stopping devices relatively out of stopping relation prior to the forward movement of the line space frame.

2. A typewriting machine comprising a platen frame, a substantially flat platen mounted in said frame, a line space frame movable on said platen frame forwardly and rearwardly over the platen to line space, a type carriage mounted on said line space frame for movement in one direction to letter space and in the opposite direction to return said carriage, type mechanism on said carriage for engaging a work-sheet supported on the platen, a transversely extending gage at- 10 taohed to the platen and arranged to be engaged by a transverse edge of a work piece for locating said work piece forwardly and rearwardly on the platen, a stopping device on the platen frame having a predetermined relation to said gage, a stopping device on the line space frame arranged to engage said rst stopping device to locate the line space frame in position for the typing of the first line of the work piece held against said gage, line spacing means operated by the return movement of the carriage to move the line space frame forwardly one line space in each operation of said means and mechanism operated by said line spacing means, during the line spacing action thereof, to move the stopping devices relatively out of stopping relation prior to the forward movement of the line space frame.

3. A typewriting machine comprising a platen frame, a substantially flat platen mounted in said frame, a line space frame mounted on said platen frame for forward and rearward movement over the platen to line space, a type carriage supported on said line space frame for movement in one direction to letter space and in the opposite direction to return said carriage, type mechanism carried by said carriage for engaging a work sheet resting on the platen, means for actuating the line space frame to move the same forwardly one line space including a forwardly and rearwardly extending rock shaft mounted on the line space frame and provided with means for operating the same manually, means connected with the rear end of said shaft for imparting line space movements to the line space frame, a stop carried by the platen frame and a stop mounted on said shaft for engagement with said first stop to limit the forward movement of the line space frame with relation to the platen and arranged to be carried out of position to engage said first stop by the initial part of the line spacing movement of said rock shaft whereby the latter stop is carried out of position to engage said first stop prior to the forward movement of the line space frame as said actuating means is operated.

4. A typewriting machine comprising a platen frame, a substantially flat platen mounted in said frame, a line space frame movable on said platen frame forwardly and rearwardly over the platen to line space, a type carriage supported on said line space frame for movement in one direction to letter space and in the opposite direction to return said carriage, type mechanism carried by said carriage for engaging a work sheet resting on the platen, stops mounted respectively on the platen frame and on the line space frame for engagement to limit the forward movement of the line space frame to locate the type carriage in position for writing the rst line, a shaft extending across the line space frame, means on said shaft for engaging coacting means on the platen frame to impart line space movements to the line space frame, pawl mechanism for turning the shaft to move the line space frame to line space, a rock shaft extending forwardly and rearwardly of the line space frame, connections between the rock shaft and the pawl mechanism to actuate the rst shaft to line space, a stop Xed with respect to the platen frame, and a stop mounted on said rock shaft for engaging said fixed stop to limit the forward movement of the line space frame with relation to the platen and arranged to be moved out of position to engage said xed stop by the line spacing movement of the rock shaft.

5. A typewriting machine comprising a platen frame, a substantially flat platen mounted on said 11 frame, a line space frame mounted on the platen frame for forward and rearward movement over the platen to line space, a type carriage supported on said line space frame for movement in one direction to letter'space and in the opposite direction to return the carriage, type mechanism carried by said carriage for engaging a work sheet resting on the platen, line spacing means for actuating the line space frame to move the same forwardly one line space in each operation of said means including a forwardly and rearwardly extending rock shaft mounted on the line space frame and provided at the forward end thereof with means for turning the same manually and mechanism connected with the rear end of said shaft for imparting line spacing movements to the line space frame, a stop carried by the platen frame, a stop carried by the line space frame and shiftable thereon into and out of operative lposition for engagement with said first stop to limit the forward movement of the line space frame with relation to the platen to determine the posiltion of the rst line of writing and a connection ELMER L. WISE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 629,800 Merritt Aug. 1, 1899 856,344 Halle June 11, 1907 1,367,991 Satterstrom Feb. 8, 1921 1,904,127 Foothorap Apr. 18, 1933 1,990,480 Foothorap Feb. 12, 1935

Images