US2092585A - Power actuated carriage return mechanism for typewriting and like machines - Google Patents

Description

Sept. 7, 1937. A. F. MULHARE POWER ACTUATED CARRIAGE RETURN MECHANISM FOR TYPEWRITING AND LIKE MACHINES Filed June 4, 1934 3 Sheets-Sheet 1 llllllll Sept. 7, 1937.4 A. F. MULHARE f 2,092,585

, POWER ACTUATED CARRIAGE RETURN MECHANISM FOR TYPEWRITING AND LIKE MACHINES Y l ."INVENTOR.

Sept. 7, 1937. A, F MULHARE 2,092,585

POWER ACTUATED CARRIAGE RETURN MECHANISM FOR TYPEWRITING AND LIKE MACHINES Filed June 4, 1934 3 Sheets-Sheet 5 I INV EN TOR. /NDREW F MUAH/IRE Y ORNEY Patented Sept. 7, 1937 UNITED STATES POWER. AC'IVUA'IEIB` CARRIAGE RETURN MECHANISM FR TYKEWRITING AND LIKE MACHINES Andrew F. Mulhare, Glenbrook, Conn., assignor of one-half to Harry M. Brinkerhoff, Bogota,

Application June 4, 1934, Serial No. 728,866

16 Claims.

This invention relates to power actuated carriage return mechanisms for typewriting and like machines.

The main object of the invention, generally 5 stated, is to provide a comparatively simple and inexpensive power actuated Carriage return mechanism, which may be readily attached to many of the standard typewriting and like machines now on the market, without modifying such machines.

Another object of the invention is to provide a power carriage return mechanism with a movable motor which may be manually thrown into its operative position, by the depression of a carriage return lever and automatically thrown into its inoperative position, when the carriage has completed its return movement. s

A further object of the invention is the provision of actuating means to apply the driving power of a return motor to return the carriage when it reaches the end of its travel in letterfeed direction, and to utilize the rebound of the motor caused by the carriage coming to a sudden step after it has completed its return movement, and by the rebound thereof to automatically disengage the actuating means and also to terminate the operation of the motor.

Many additional objects to those enumerated will hereinafter appear as the description of the illustrated embodiment of the invention is developed.

Fig. l` is a fragmentary, top plan view of a typewriting machine showing my invention applied thereto.

Fig. 2 is a fragmentary, side elevation of the same.

Fig. 3 is an enlarged fragmentary detail, a side elevation of a part of my invention, showing the electric motor in its operative position.

Fig. 3a is a fragmentary sectional detail of the winding drum and its associated parts, the section being taken on a horizontal centre line of the tape winding drum.

Fig. 4 is a View similar to Fig. 3 but showing 'the electric motor thrown to its inoperative position, and with the release pawl shown in its lower position.

Fig. 5 is a detail plan View of the motor swinging lever and the switch operating mechanism shown in Figs. 3 `and 4.

Fig. 6 is a fragmentary detail perspective view of a portion of the switch operating mechanism.

Fig. 7 is'a fragmentary side elevation showing the return latch engaging the underside of the motor swinging lever when the carriage return rod is returning to its normal position.

Fig. 8 is a rear elevation of the electric motor, its mounting, and switch operating mechanism with part of the casing broken away for the sake of clearness.

Fig. 9 is an enlarged top plan view of the carriage return lever for throwing the electric motor into operation.

Fig. l0 is an enlarged fragmentary detail view l0 of the gear and pinion teeth and Fig. 11 is a diagrammatic view of the electric circuits and connections by which the motor is controlled.

Referring now more closely to the drawings, by characters of reference, the numeral 2|] indicates the frameof a usual typewriter, a fragmentary portion of the same being shown in the drawings.v In a similar manner are shown in the figures the travellingl carriage 2l and the rotatable platen 22, only such portions of the same being illustrated as are considered necessary to understand my improvement on machines of the type in question.

The pivoted carriage return lever 23 is also indicated, operating, in the usual manner, the platen rotating and advancing mechanism 24, as it is well known in the art.

As the rst element in my invention, I apply an angular base frame 25 to the underside of the frame 20 of the typewriter, preferably by securing the same on the legs 26 of the machine. An extension platform 21 is provided on the angular base frame 25` and the base box 28 is secured on said frame extension 21 or made integral therewith. Said base box supports an electric motor 29 operating my improved return mechanism in the following manner (Figs. 2, 3 and 8). A U-shaped upstanding supporting frame 33 is secured on the top 28al of the base box 40 23, carrying two pins 3l in the two upstanding branches'thereof and motor 29 is secured to a U-shaped cradle frame 32 which is rockable or swingable on said pins 3|, and a plate member 33 may be secured on the motor housing at the 45 left hand side thereof, a motor rocking coiled tension spring 34 being secured between said plate and the base box 28, as shown in the figures.

The return of the carriage 2l is executed through a tape 35, one end of the same being securedto the usual return lever 23, as at 36, said tape 35 being carried over a pulley 31 at the right hand side of thetypewriting machine then let downwardly, as at 35a, passed over a second pulley 38 near the bottom of the machine at the right hand side thereof, and then turned into a substantially horizontal branch h, whereupon its other end is secured to a winding drum 39 being the return element proper of my mechanism, as at 43 (Fig. 8).

The return tape winding drum 39 is adapted to be driven by the motor 29 through the mechanisrn best illustrated in Figs. 3, 3a and 8. A second upstanding drum support frame 4| is secured on the left hand side of the base box top 28a and its two upstanding branches 4la are extended in a lateral inward direction (Fig. 2) to provide a support for the winding drum 39 and its associated parts to be described presently. Two inwardly projecting pins 42 are secured in said walls 4ta, drum 39 being journalled on said pins. A large toothed gear 43 is secured to the drum and rotatable therewith at the right hand side thereof, while to the left hand side of the same a spring containing drum 44 is secured in a similar manner, housing the coiled spring 45, the outer end of which being secured to the inside of the drum 44, as at 46, while the inner end of the spring 45 is secured as at 48 to a stationary member 41, secured on the wall 4m (Fig. 3a).

The left end of the shaft of the motor carries a pinion 49 which, on the return movement of the carriage, will be thrown in mesh with the large gear 43. Back of said pinion 49 the ratchet gear 50 is secured on the shaft of the motor 29, rotatable therewith and a pivoted motor pawl, 5l is normally in engagement with the ratchet gear 50 under the influence of the spring 52; said 'j motor pawl 5I being pivoted in a lever 53, as at 54; said lever 53 again being pivoted in the wall 4|a of the drum frame 4l, as at 54a, said lever 53 also being normally urged into a position enabling motor pawl 5l to engage the ratchet gear 59 through the springs 52 and 55, as will be obvious by inspecting Fig. 3. Limits 56 secured to wall 4|a, may also be provided for the inward and outward movements of the motor pawl 5I.

A motor swinging pin 51 is secured to the rockable cradle frame 32, preferably pointing downwardly from the left hand side thereof and projecting into the base box 28 through an elongated opening 58 (Fig. 8) in the top thereof and stops 59 may also be provided at the two sides 0f said cradle frame to limit the right hand and left hand swinging thereof. A motor swinging lever 60 is pivoted on the underside of the top 28a of the base box, as at 6I, (Figs. 5 and 8) crossing the path of said motor swinging pin 51 and being normally urged away from the same by a tension spring 62. An electrical switch box 63 of any appropriate make, well-known in the art may also be secured depending from said base box top 28a, having a slidable projecting pin or post 64, the inward movement of which is adapted to close the circuit of the electric motor while the automatic outward movement thereof will break said circuit. A circuit closing lever 65 is pivoted, as at 66, in an extension 61 of the switch box securing plate 68 operating, by a transverse arm 69 thereon, said circuit closing pin 64, normally being urged into a circuit closing position by the compression spring 10 interposed between its extension 65a and the extension 61a on the supporting plate or bracket 61. 'I'he outer end 65h of said circuit closing lever 65 carries an upstanding pin 65e, being also in the path of the motor swinging lever 69 but on the reverse side from that of the motor swinging pin 51.

An angular lock lever 68 is also provided pivoted on the top 28a of the base box 28 opposite the outer end 69a of the motor swinging lever 6), preferably on a downwardly turned U-shaped frame 69 depending from said top 28a and having a downwardly projecting arm 19' normally urged in an inward direction by the tension spring 1I, the other end of which is secured on the opposite wall of the box 28, as at 1la. The lock level` 68 further carries an upwardly projecting limit or stop 12 by which it may engage the motor swinging lever 69 and said lever 68 is terminated at its inward end by a curved upward arm 63a, the upper end of which is opposite to and adapted to co-operate with the lower end of the downwardly turned curved terminal arm 53a of the motor pawl carrying lever 53 (Figs. 3 and 4).

An angular carriage return key or lever 13 may further be pivoted on the lower left hand side of the typewriter frame 26, the downwardly projecting arm 13m thereof being pivotally secured to a return push rod 14, the inner end 14a of which is again pivoted to the lower end of a link member 15, the upper end 15a of which is again pivoted on the second depending branch of the U-shaped carrying member 69 for the lock lever 68. A rockable return latch member 16 is carried by the return push rod 14 pivoted, as at 16a, and guided in its movement through the slot and pin arrangement shown at 16h. A tension spring 11 is secured between the extension 18 of latch 16 and the return push rod 14, normally pressing a downwardly turned arm 19 thereof against an adjustable stop 3D and causing an upward projection or abutment 8l of said latch to move in an upward direction and to be in the level of the motor swinging lever 60 (see Fig. 4). The carriage return key or lever 13 may preferably be arranged pivoted on the pin of the tape guide pulley 33 (Fig. 9) and a helical spring 82 may urge the same in an upward direction pulling the abutment 8l away from the motor swinging lever 69, as indicated by arrows 33 and 84 (Fig. 2). An operating button 85 is provided at the exposed end of the return key or lever 13 by which it may be depressed when it is desired to operate the carriage return mechanism of the typewriter, as will be more fully explained hereinafter.

The operation of my invention is as follows:

When the carriage is being returned by my device the motor 29 and its associated parts will be in the position shown in Fig. 3, being placed there-into by means to be described hereinafter, i

and kept therein, as also will be more fully explained presently.

In such a position of the motor, that is, when its center line 86 is tilted to the left around the pivot 3|, as indicated by the numeral 86a, the gears 43 and 49 will be in mesh, and if we suppose the motor is run in the direction of the arrow 81, then the gear 43 will rotate during the return movement of the carriage in the direction of arrow 88 and the tape 35 will be wound up on the drum 39 to which the gear 43 is secured, and which is the main return element of my device, thereby pulling the platen operating and return lever 23 in a right hand direction, looking at the machine from the front thereof (Fig. l).

Spring drum 44 is also secured to the tape winding drum 39 and the rotation of said winding drum 39 will carry the drum 44 and thereby unwind or loosen the spring 45 therein, so that upon the next forward or letter feed travel of the carriage, said spring 45 will take up the slack in tape 35. This winding up of the tape 35 and the movement of the carriage to the right hand side of the machine will continue until a set marginal limit B9 will reach the permanent marginal stop 96, when the carriage will reach the limit of its return travel.

While this operation is going on the .motor swinging lever E9 is in its inward position indicated in Fig. 5, having been placed thereinto by a previous operation and kept therein by engaging the upstanding lug or abutment 12 on lock lever 68, and the same motor swinging lever 69 will keep motor Z9 in its operative position, as shown in Fig. 3, by engaging the motor swinging pin 51 (Figs. 3, 5 and 6). At the same time compression spring 'lll will press the extension 55a of the circuit closing lever 65 in the direction indicated by arrow 9| which will cause its longer arm 65 to be moved in the direction of arrow 92 and so to push the circuit closing switch member 5l! inwardly, by the extension 69, so that the circuit of the motor will be kept closed while the motor is in the operative position of Fig. 3.

' The described movements may obviously be timed in such a manner as to close the circuit only after the pinion 49 of the motor has entered the driven gear 43.

When, however, the carriage arrives at the termination of its travel, the adjustable marginal stop 89 will hit the marginal stop 90 and the whole mass of the carriage being thus brought to a sudden stop by a sudden impact, will somewhat rebound and will cause the drum 39 and the large gear t3 connected therewith to rotate in the opposite direction to that of `arrow 88, (Fig. 3) as indicated by the dotted arrow 93, which, again, will for a moment turn the motor pinion 49 and the ratchet disc 59 connected therewith in the opposite direction to that indicated by the arrow 97, as indicated by the dotted arrow 94, so that the pawl 5l will be pushed downwardly by the ratchet 53 until it, for a moment, reaches about the position shown in Fig. 4.

The rebound mentioned above will be caused by the inherent resiliency and elasticity of the masses and parts involved and while it may give a very small return travel to the carriage it will be sufficient to exert a small reverse rocking action on the drum 39 through the taut band 35 and its portion tightly rolled around said drum 35. Even a very slight angular rocking motion of the drum 39 will cause a much larger angular rocking motion at the toothed periphery of the gear 43, as indicated by said dottedy arrow 93, since the diameter of said gear 43 is several times larger than that of the drum 39 with the tightly wound roll of the band 35 thereon. The travel on the periphery of the gear 43 will be transmitted in an equal amount on the periphery of the pinion 49 which will cause said pinion and the ratchet disc 50, connected therewith, to describe quite a large angular rocking motion, since the diameter of the pinion 49 is again several times smaller than that of the gear 43 and it'will be obvious that this twice magnied motion will be suicient tocause the described movement in the pawl 5l, putting the same in the position indicated in Fig. 4, even if the rebound starting and originating said motion is of a very small amount. 1n the said position of the ratchet 5I the downwardly turned terminal arm 53a of the pivoted pawl carrying` lever 53 will engage the V upwardly turned curved arm 68a onA the lock lever 68 and will push the same in a downward direction until the upstanding lug or abutment 'i2 will release the motor swinging lever 60. The lever 6U will thereupon be pulled by the spring E2 into its left hand position, indicated by the dotted lines in Fig. 5, in which position its front edge 95 will engage the upstanding pin 65e on the circuit closing lever E5 and will move said lever also into its left handed position, indicated by the dotted lines in said Fig. 5, whereupon the circuit closing pin 64 will be released and will automatically break the motor circuit, stopping the operation of the motor, at the same time the motor being pulled by the spring 34 into a right hand tilted position, the center line of which is indicated by the line 86h, its pinion 49 being moved out of mesh with the gear 43, i. e., the return winding of the tape 35 will cease and the return mechanism of the carriage will be put out of operation.

The machine is now ready for another line to be typed thereon during which the carriage will slowly move forward under the usual spring action in typewriters and by the letter feed operation of the user of the machine.

When now the limit of the line to be typed is reached and it is time to again return the carriage of the machine, the user or operator of the machine will depress the return key lever 13 into its position indicated in Fig. 2 b-y the full lines and this will move the pivoted push rod 'le inwardly, as shown by the arrow 95, causing the pivoted link arm or lever 75, at the inner end thereof, to also move in an inward direction, thereby moving the return latch mechanism 76, arranged on said push rod 14, in an inward and ldownward direction. The upstanding lug o-r abutment 8| in the front of said latch device 'H3 will now engage the front edge B5 of the motor swinging lever 68 and will rnove said lever in a reverse direction to that described hereinbefore in connection with the disengaging of the motor from the gear 43, andthe opposite edge 97 of said lever will engage the motor swinging pin 51 and will tilt the motor back into the position in which its pinion 13.9 again engages the gear 43, the center line 86 of the motor again taking up the position indicated in Fig. 3 by the numeral 86a. The motor is now ready to again drive the gear 43 and with it the drum 38 in the direction in which the carriage will be returned, and, at the same time, pawl 5l and its associated parts will be returned to their original position shown in Fig. 3.

The circuit closing lever 65 will also be returned to its position,shown in Fig. 5 by full lines, in which the circuit closing switch pin Bil will be pushed inwardly and will close the electrical switch for the motor.

When the lock lever 68 is pushed downwardly by the arms 68a and 53a, as has been described hereinbefore, its catch lock 'l2 will be forced below the lower surface of the motor swinging lever 60 and the same will swing thereover into its dotted position, shown in Fig. 5 so that in this position said lever and its catch or stop lug 12 will be in the position shown in Fig. 4. When, however, the motor is returned to its operative position, as shown in Fig. 3 and described hereinbefore, said lever 60 will be pushed in a right hand direction as shown in Fig. 5, into its full line position, will entirely pass over the stop lug l2, and the spring 'H will pull the lever 68 in an upward direction until the lugl'l2 will again engage the iront edge 95 of said lever 60, while,

at the same time, the curved arm 68a will be in the position shown in Fig. 3 ready to again be engaged by the curved arm 53a of the pawl Carrying lever 53.

It may sometimes happen, through inadvertence or forgetfulness, that the return key lever 13 will be kept in a downwardly pressed position longer than desired, in which case the front lug or abutment 8l of the latch 'l5 will be held below the motor swinging lever 60 and therefore pressure on the return key lever must be released to return the latch 16 to its operative position. Upon release of the key 13 the same will be returned into its normal position, indicated in Fig. 2 by the dotted lines, under the iniiuence of the spring 82 and the push rod 14, and the latch mechanism will travel upwardly into their normal position shown in Fig. 4. During the portion of said travel in which lug 8| is underneath the lever B0 the latch T6 will be tilted as indicated in Fig. '7, and will be returned to its normal substantially horizontal position by the spring 'l1 when the lug 8l is released from underneath the lever Gil, whereupon the return key 13 and its associated parts are ready for the movements described hereinbefore and resulting in again placing the motor 29 into its operative position shown in Fig. 3. To regulate the action of the latch 1G, the height to the top edge of the lug 8| is adjusted through the use of eccentric means 80, the operation of which will be obvious to all versed in the art, in such a manner that at the end of the travel of the push rod 14 said top edge will be underneath the lower surface of the lever Sii and the same may freely swing thereover.

The electrical circuit of my device is illustrated in a diagrammatical manner in Fig. l1 wherein the numeral 00 indicates any appropriate source of current, the circuit starting from its pole lill, passing through the adjustable resistance or rheostat |02, then through the motor 29, the circuit being broken or closed by the lever 55 operated as described hereinbefore.

I also want to remark that I preferably einploy an entirely novel type of teeth for the pinion i9 and the gear 43, the same being illustrated in a fragmentary manner and on an enlarged scale in Fig. l0. The teeth l i0 in my novel gear are formed with substantially radial and parallel sides llH and continued with inwardly inclined top surfaces H2 coming to a point or apex H3. My experience has been that such type of gears can always be brought into mesh with one another without any undue impact clash and noise since the pointed apexes thereof will always readily find their way into the spaces H4 between the teeth.

The current may be introduced through push plug H5 (Fig. 8) into the circuit, arranged in the base box 28 and in the parts of the motor in any appropriate manner, as will be understood by those versed in the art, while the strength of the current and the speed of the return may be regulated through a rotating knob H6 by the user of the machine, if desired, as also will be understood.

It will be obvious that various modifications might be made which could be used without departing from the spirit of my invention, and I do not mean to limit myself to precise details of construction, or to precise arrangements or combinations of parts.

What I claim as new is:

1. In a device to terminate the operation of a motor on a travelling object at a predetermined limit, having a movable object, a motor, and connecting means between the object and the motor adapted to cause said motor to move said object, and a limit stop for limiting the travel of said object, terminating means adapted to be set into operation by the rebound of the object from said limit stop and to disengage, when so operating, said connecting means between the motor and the object.

2. In a motor operated return mechanism for typewriters and the like machines, having a travelling carriage and a limit stop member for limiting the travel of said carriage, and connecting means between said motor and said carriage to enable said motor to return said carriage; said motor being movable in relation to said connecting means; means for manually moving the motor into its operative position and means for automatically moving the motor into its inoperative position disengaged from said connecting means through the rebound of the carriage from said limit stop.

3. In a device to terminate the operation of a motor on a travelling object at a predetermined limit, having a movable object, a motor, a source of supply for said motor, a stop to limit the travel of the object, connecting means between the object and the motor to enable the motor to move said object, terminating means adapted to be set into operation by the rebound of the object from said limit stop and to disengage, when so operating, said motor from said source of supply and means to keep said motor so disengaged from said source of supply.

4. In a device to terminate the operation of a motor on a travelling object at a predetermined limit, having a movable. object, a motor, connecting means between the motor and said object to enable the motor to vmove said object, a stop to limit the travel of the object, said motor being movable in relation to said connecting means and means to move said motor out of operative engagement with said connecting means through the rebound of the object from said limit stop.

5. In a device to terminate the operation of a motor on a travelling object at a predetermined limit, having a movable object, a motor, connecting means between the motor and said object to enable the motor to move said object, a stop to limit the travel of the object, said motor being movable in relation to said connecting means, means for moving the motor into its operative position and means for moving the motor out of operative engagement with said connecting means through the rebound of the object from said limit stop.

6. In a motor operated return mechanism for typewriters and like machines having a travelling carriage and a marginal stop to limit the travel of said carriage, connecting means between the motor and said carriage to enable the motor to return said carriage, said motor being movable in relation to said connecting means, and means to move said motor out of operative engagement with said connecting means through the rebound of the carriage from said marginal stop.

'7. In a motor operated return mechanism for typewriters and like machines having a travelling carriage and a marginal stop to limit the travel of said carriage, connecting means between the motor and said carriage to enable the motor to return said carriage, said motor being movable in relation to said connecting means, means to move said motor into operative engagement with said connecting means and means to move said motor out of operative engagement with said connecting means through the rebound of the carriage from said marginal stop.

8. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between said motor and said element to enable the motor to return the carriage, a marginal stop to limit the. travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means through the rebound of the carriage from said marginal stop.

9. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between said motor and said element to enable the motor to return the carriage, a marginal stop to limit the travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means through the rebound of the carriage from said marginal stop, said disengaging means comprising means whereby said motor is made movable in relation to said connecting means, .and means to move the said motor upon said rebound of the carriage from said marginal stop in such a manner as to cause said motor to disengage from said connecting means.

l0. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between the motor and said element to enable the motor to return the carriage, a marginal stop to limit the travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means through the rebound of the carriage from said marginal stop, said disengaging meansv comprising means whereby said motor is made movable in relation to said connecting means, and means to move said motor upon said rebound of the carriage from said marginal stop in such a manner as to cause the motor to disengage from said connecting means, said motor being made movable by arranging it rockable on a pivot.

ll. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between the motor and said element to enable the motor to return the carriage, a marginal stop to limit the travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means through the rebound of the carriage from said marginal stop, said connecting means including a gear to transmit motion to said return element, a pinion on the motor shaft adapted to drive said gear, said disengaging means including means whereby said motor is made movable in relation to said gear, and means to move the said motor into a position wherein said pinion and gear are out of mesh.

12. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between the motor and said element to enable the motor to return the carriage, a marginal stop to limit the travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means upon the rebound of said carriage from said marginal stop, said connecting means including a gear to transmit motion to said return element, a pinion on the motor shaft adapted to drive said gear, said disengaging means including means whereby said motor is made movable in relation to said gear, and means to move said motor into a position wherein said pinion and gear are out of mesh, said motor being pivotally arranged and its said movement being executed by rocking the same on its pivot.

13. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which will cause the return of the carriage, connecting means between said motor and said element adapted to move said element to return the carriage, a marginal stop to limit the travel of said carriage, and disengaging means whereby said motor will automatically cease to act on said connecting means through the rebound of the carriage from said marginal stop, a locking member to keep said motor in engagement with said connecting means, and said disengaging means including a resilient member normally tending to disconnect said motor from said connecting means, and means whereby said locking member will be released through the rebound of the carriage.

le. In a motor operated return mechanism for typewriters and like machines having a travelling carriage, a return element the motion of which ill cause the return of the carriage, connecting means between the motor and said element whereby the motor is normally adapted to move said element to return the carriage, a marginal stop to limit the travel of said carriage, sai-d motor being movable in relation to said connecting means, and disengaging means whereby said motor will be automatically thrown out of operative engagement with said connecting means through the rebound or said carriage from said marginal stop.

15. In a typewriting machine, the combination with a carriage, ofmeans to effect the return movement of said carriage, including an electric motor, connecting means between said carriage and said motor to enable the motor to return said carriage, a marginal stop to limit the travel of said carriage, a switch in the motor circuit, said motor being movable in relation to said connecting means, and means to open the switch and move said motor out oi operative engagement with said connecting means through the rebound of the carriage from said marginal stop.

16. In a typewriting machine, the combination with a carriage, of means to effect the return movement of ,said carriage, including an electric motor, connecting means between said carriage and said motor to enable the motor to return said carriage, a marginal stop to limit the travel of said carriage, said motor being movable in relation to said connecting means, a switch in the motor circuit, means for closing the switch and moving the motor into its operative position, and means to open said switch and move said motor out of operative engagement with said connecting means through the rebound of the carriage from said marginal stop.-

ANDREW F. MULI-IARE.

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