US2606641A - Carriage return mechanism for recording apparatus - Google Patents

Description

Aug. 12, 1952 E. E. KLEINSCHMIDT CARRIAGE RETURN MECHANISM FOR RECORDING APPARATUS 5 Sheets-Sheet 1 Filed Aug. 20, 1947 S E Q R INVENTOR. Edward E. K/e/hschm/df BY A //M A? A f for/rays Aug. 12, 1952 E. E. KLEINSCHMIDT CARRIAGE RETURN MECHANISM FOR RECORDING APPARATUS Filed Aug. 20, 1947 5 Sheets-Sheet 2 CARR [AGE RETURN TABULAT \NG AND SPACE lllllllllll Illllllllllll Illl lllllll Fig 4 f M m mm K E m Wy EB A fforneys g- 12, 1952 E. E. KLEINSCHMIDT 2,606,641

CARRIAGE RETURN MECHANISM FOR RECORDING APPARATUS Filed Aug. 20, 1947 s Sheets-Sheet 5 qward E Kleinschmidf AM M M Af/orneys Patented Aug. 12, 1952 UNITED STATES PATENT OFFICE,

CARRIAGE RETURN MECHANISM FOR RECORDING APPARATUS Edward E. Kleiuschmidt, Highland Park, 111. Application August 20, 1947, Serial No. 769,664

' 11 Claims. ((1197-66) This invention relates to recording apparatus, such as typewriters or telegraph printing apparatus, in which the operation of the printing unit is selectively controlled in responseto different signal impulses.

In apparatusof this class, it has heretofore been the practice to provide power operated means to intermittently move a type or platen carriage in one direction for character spacing, in which movement energy is stored in a carriage return spring which moves the carriage in the opposite direction to starting positionwhen the spacing mechanism is disconnected from the power source. A dashpot or other type of shock. absorber, checks or cushions the return movementof the carriage as-it approaches the starting position. Thisarrangement does not give satisfactory service when the apparatus. is used on board ship or in airplanes, in which the. apparatus is not always in a fixed horizontal posi-' tion. When tilted from the horizontal, the power stored in the return spring is influenced by gravity. resulting in an uncertain, variable return motion of the carriage and defective functioning of the spring to return the carriage to the cor-'- rect starting position. 1 1

When such mechanically operated typewriters or signal controlled telegraph typewriters are equipped with a tabulating mechanism, certain difficulties in construction and operation are in: troduced, as the carriage must be quickly returned to a precisely fixed starting position, and the tabulating operations must also be quickly accomplished in step movements of variable length. V j

It is accordingly the general object and pur-. pose of the present invention to provide a printing or recordingvapparatus of the above types, which will operate with equalcertainty and eniciency in either a fixed horizontal position or when carried by a ship, airplane, or other vehicle.

A more particular object of the invention is to overcome the above noted deficiencies of prior recording apparatus by the provisionof power operated carriage return mechanism, together with an energy storing device operatively connected with a part of said mechanism and ren-' dered effective in the return movement of the carriage to starting position, to impart character spacing and tabulating movements to the carriage. 7

'Another object of'the invention resides in th provision of simple, positively operating means for effectively eliminating shock by decelerating the return movement of the carriage to starting position by the power operated means.

' It is a further object of the invention to provide a novel tabulating mechanism of greatly simplified construction, embodying a series of tabulating stops, together with means operable either from a keyboard or 2 by selectively controlled,- function operating elements of a telegraph printer, to selectively set the tabulating stops in operative position.

Y One of the specific objects is to provide a very. compactmounting of the tabulating stops in a use of my improved power carriage return in combination with spring powered spacing means for tabulating operation in machines of this type is, therefore, an important feature of the present invention; 7

Another object resides in the provision ,of means controlling the operative connectionof the carriage return mechanism with the source of power, and means embodied in the motion transmitting connections for starting the return movement without shock or jerk,- and for decelerating the approach of the carriage to a fixed starting position. 7

.Among other practicalobjects of the invention, reference is made to an improved andv simplified escapement mechanism for character and tabular spacing of the carriage, and .the rugged and durable structural form of the cooperating elements, insuring improved operating efiiciency and conducing to reasonably low production costs and maintenance expense,

With the above and other subordinate objects in view, the invention comprises the improved recording apparatus and the construction and relative arrangement of its several parts, as will hereinafter be more fully described, illustrated in the accompanying drawings, and subsequently incorporated in the subjoined claims.

'In the drawings, wherein I have disclosed one simple and practical embodiment of my present invention, and in which similar reference characters designate corresponding parts throughout the several views: 1

Figure 1 is an elevation, partly in section, showing the carriage return and spacing and tabulating mechanisms, the several parts of the latter being illustrated in normal unoperated position, .and the carriage return mechanism disconnected from the power driven shaft;

Figure 2 is a fragmentary top plan view showing the spacing escapement mechanism and the carriage decelerating means, with the parts of the latter in relative positions at the final stop position of the carriage when said mechanism. is disconnected from the power source;

Figure 3 is a similar view showing the relative positions of said parts at the start of deceleration prior to disconnection of the mechanism from the power source;

Figure 4 is a fragmentary side ';.elevation,--cer-;' tain parts of the carriage return mechanism being omitted;

In the frame standard I2, a rocli shaft 16 is mounted and to this shaft, the operating arm Figure 5 is a perspective view, illustrating oer tain of the parts of the tabulating and escapement mechanisms; I

Figure 6 is a fragmentary elevation showing one of the tabulating stops in its set position and engaging the cooperating stop lever latched in its operated position;

Figure '7 is a similar view showing the" stop lever in its unoperated position out of the path of movementof the set tabulating stop;

Figure 8 is a similar view showing the-means for wiping out or restoringthe set-up tabulatin-g. return movement of the'carriagef stops in the and Figure 9 is a fragmentary perspective view showing an arrangement of key levers controlling the operation of the tabulating and carriage return mechanisms, embodied in' a standard typewriter'keyboardf I Referring-in further detail to the drawings, a part of the machine frame indicated at I0, is formed with a standard IZ'in which the lower end of a" fixed shaft-'01 spindle I4 is suitably secured. A sleeve l6 having an' 'an'ti friction bearing I8 in the upper end thereof is mounted upon the spindle I4 for free rotationrelative thereto. To said upper endof the sleeve -16, the carriage drive gear and a spacing ratchet; 22 are securely'fixed by rivets 'orscrews as at 24. To the lower end of sleeve I6, the'carriage return gear 28 snd'decammg arm 28"suitably spaced above said gear are rigidly secured by the rivets-30. -1 j To the underside of thegear-N' a drum 32- is secured by screws 34 inconcentrid relation with said gear, said drum carrying a-trip' arm indicated at 3 6 This trip arm is adapted t'o coact with theupper end of a'trip finger 38 pivo t-al1y mountedon the stud '4ll form'ed on pedestal I2.

In laterally spaced relation from the fixed shaft or spindle l4, a "second verticallyfdisposed shaft 42 is suitablyfixed'atits lower end in'the'frame Ill, and upon this shaft a sleeve 44 is supported by anti-friction bearing ffififfor-free rotation. A

gear 48 loosely surrounds the upper end of the sleeve '44 between the flange 50 thereof,-having friction material 52' on its lower-face, and a friction disc "fifloosely surrounding the sleeve 44. Between the disc '54 and an adjustingnut 56 threaded on the sleeve 44; an annular elastic member 58 is interposed; -By the adjustment of this nut, frictional resistance tothe unitary rotation of gear 58 with the sleeve :44 may be properly regulated. y

To the upper surface of the gear 48a decelerating cam plate 68 is rigidly secured and projects laterally beyondthe periphery of said gear, Gear 26i's provided with a blank oruntoothed portion; as shown at 62 in Figure-Sci the drawings, so that the-transmission of rotation from gear 48' to said'gear and the parts connected'therewith is interrupted, during which time rotation is transmitted to sleeve I6 through 'cam plate 60 and decelerating arm 28, in the manner to be later explained.

' A clutchicollar s4 is splined or non-rotatably keyed on the lower end of sleeve 44 for sliding movement relative thereto, and is adapted'to 60- operate with compleinentary'clutch member 66 "18 for clutch collar 64 and latch arm are ad- 'justably fastened at one of their ends, said arms projecting from the relatively opposite sides of said shaft. A spring 82 connected to arm I8 yieldingly urges clutch collar 64 into power transmitting engagement with the clutch member 66.

The clutch collar is retained in its disengaged position by the latch d0g84 pivoted on the frame at 86 at one end and yieldingly held by spring 88 in latching engagement with the end' of arm 80 on' the shaft 16. To the-opp osite end of shaft '16, an upwardly extending, de-clutching leverilii is fixed, a'ndiias its upper end disposed in the path'of'inover'nent of an angularextension 92 on the decelerating arm- 28 for engagement thereby in the final'return movement of the carriage to its starting position. I 1

'A" roller 94 is suitably mounted on the outer end of arm 28'for movement into: the cam slot 36 in the plate 69 on gear 8, as the carriage approaches its starting position, and it will be noted that the inner closed end of this slot'is located closely'adjacent to the axis of 'gear' 48.

The carriage spacing spring 98 has'one of its ends suitably'fixedto the sleeve I6, and at its other end is attached to a part of the machine frame, as clearly shown in Figurel of the drawings. This spring tends; to rotate the sleeve IG against the, retaining 'or holding action of two spacing pawls' I 00, and I32 respectively, 'pivotally mounted upo'nthe common supporting stud I04 fixed .in the machine frame. The pawl IEJZ-has a bifurcated portion I06 on one side of the pivot, which receives a cam lug I08 on the pawl I00 for cooperation with the obliquely-inclined end wall I I0 of said bifurcation! The toothed ends I I2 and I I4, "of the respective pawls are normally biased into engagement with the' teeth of the spacin'g ratchet 22 by a spring II 8' connecting thefother spaced ends of said pawls, as shown in Figure 2 of the drawings. I

A link I I8 is operatively connected with means actuated by the space bar and key. levers of a typewriter or other machine, and isrpivotally connected with the pawl I05 as indicated at I20. A spring I22 connected to said link-normally holds the pawl H10 in contact with stop pin I24 fixed in the machine frame. When said link is moved against the resistance of spring I22, pawl I00 is moved away from step I24 and its toothed end H2 engaged witha tooth of the spacing ratchet 22. At the same time, cam lug I98 on said pawl coacts with inclined surface III] to move pawl I82 out of engagement with the spacing ratchet 22, thusallowing said ratchet-to move a'parti-al distance of one tooth, when the tooth on pawl I09 is then engaged by a ratchet tooth to hold the ratchet against further rota; tion. On the return movement of link I I8, pawl I00 is moved into the position shown in. Figure 2 of the drawings while pawl I82 engages a suc ceeding tooth on the ratchet. 'In this manner, the spacing ratchet 22 will escape one tooth for each cycle of movement of the link II8.- Thus rack I26 and the carriage to which it is attached will assumepositions corresponding to movements of the'spacing ratchet 22 andgear 20;

5. which is in constant" engagement with the teeth of rack I26. f

In Figure 4 of the draWings' I have shown a portion ofa' typecarriage IZB which may "be mounted in conventional" manner in themachine frame for horizontal movement'as by means of the angularly related rollers" I36 in supporting contact with a fixed'cylindrical rail CI32. However, in certain types of telegraph printing apparatus, theitype bars remain stationary while the platen is mounted in a movable carriage, and it'will be understood as this description proceeds that the novel features of the presentinvention areapplicable as well to this type of printing or recording machine; i 1 r 'From reference to Figures 1 and :4 of the drawings, it will be noted'that the cylindrical wall of the drum 32 is provided in the outer side thereof with-circumferentially spaced vertical slots I34, corresponding in number with the number of character spacing positions of the carriage I28. Atabulating stop or detent member I36 is frictionally mounted in each of these slots formovement to' either one of two vertical positions relative to the drum wall. Each of said stop members is provided in its" outer edge with adjacent notches indicated at I38; with which an annular coiled wire spring I46, common to all of said members, .coacts to yieldingly retain the individual stop members in set or unset position. A tabulator stop-setting lever I42 is pivoted on stud I44 Efixed in frame 16, and has a horizontally disposed arm, the freeend of which is positioned above the series-of tabulator stops I36. 7 This lever: is :normally held in "unoperated position by spring I46 connected to said horizontal arm and holding the same in contact with stop pin I48 on the, frame; To a second arm of lever I42 extending downwardly from the pivot I44, the tabulator stop-setting lever I56 is connected by means of link I52. This leveris pivotally'supported intermediate of its ends as at I54,'and at its upper end is adapted to be engaged by actuating element. I56 operated by the function operating meansof a telegraph printer. l

To selectively setup the tabulating stop members irr thedrum 32 ,the carriage is first spaced to the desired position in accordance with the 6 moved to its operated position relative to the'set stop members I36 in the drum'32.

The upper end of arm I68 is connected by link I16 with the lower end of depending arm I18 suitably fixed at its upper end to one end of a rock shaft I86 mounted in an extension of the frame I6. To the other end of saidshaft an upwardly extending arm I82 is suitably fixed and has contact with the collar I84 fixedupon rod I86 extending through the end of said'arm. One end of this rod is pivotally connected as at I88 to the pawl I62 of the escapement mechanism.

Arm-I18 is also connected by link rod I66t0, the lower end of the tabulating lever I92 mounted upon the fixed pivot I64 and engaged at its upper end by actuatingelement I96, operated by the function operating means of a telegraph printer. I

As shown in Figure 1 of the drawings, the lever I 58 is disposed substantially radially of the drum 32 and'has a cam lug I98 projecting from one side thereof with which the lower ends of the set tabulating stops I36 engage in the return move I ment of the carriage to push up or restore said predetermined spacing of.columns to be printed on the record sheet. Upon actuation of the tabulator stop setting --lev er I56, lever I42 will then be operated to move the selected stop member 'I 36 downwardly against the resistance of spring I46 and into the path of a stop lever I58, when the latter is moved to operatedposition as will be presently described. This lever, as seen in Figure 5 of thedrawings, has a'substantially U-shaped end portion I66 pivotally mounted upon a stud I62 fixed in the machine frame. Lever I58, ex tends inwardly beneath the, drum 82 and has vertical movement in a guide bracket I64 fixed to the frame, said bracket having a shoulder I66 for latching the lever in its operated position. Theend portion I66of lever I56 is formed with an arm I66 extending vertically above and below the pivot stud I62 and a spring I16 connected to the lower end of said arm holds the same against stop I12 in its unoperated position, as shown in Figures 1 and 5. V The stop lever I58 may have ya slight movement axially of the pivot stud I62 andja spring I14 connected to said lever and to a part of the frame is under tension in the normal position ofsaid lever and acts to yieldingly hold the lower edge of the lever in contact upon the shoulder I66 of bracket I64 when the lever is tabulator stops to their non-operated positions in the drum. With the opposite side of said lever, the lower end of the pivoted finger 38 is adapted to engage, as seen most clearly in Figure5 of the drawings. I?

Carriage return lever 266 mounted on fixed pivot 262 is operatively connected at its 'lower end by link. rod 264 withthe pivoted latch lever 84. Link rod 266 also connects lever 266 to depending arm 268 on" one end of a second rock shaft 2I6 mounted in the machine frame, the other end of which is'provided with an upwardly extending arm 2 I 2 in bearing contact'with a second collar 2 I4 fixed on the operating rod I86 for escapement pawl I02. Actuating element 2I6 engaged with the upper end of lever 260, is operated by a typewriter key lever or function operating means of a telegraph printer.

Assuming that all desired tabulating stops I36 have been set in the drum 32, and it'is desired to use the same for filling in a form or grouping the printedcharacters in variably spaced'columns; the-tabulating lever I92 is then operatedtospace thecarriage into proper position for printing in the next column-Stop lever I58 is thus operated by link: I96 against resistance of the spring I16 and .moves upwardly into the path of the set tabulating stops and is held upon latch shoulder I66 by the spring I14. Pawl I62 is also actuated by arm I82 and rod I86 and moved out of engagement with the spacing ratchet 22, whereupon said ratchet, gear 26, drum 32 and all other'parts con nected to sleeve I6 are free to rotate in acounterclockwise direction under the influence of spring 98. As-seen in Figure 2 of the drawingsthe gear 26 thus moves the rack and the type carriage connected thereto to the right until a s'et'tabulating stop I36 carried by the drumsz strikes the stop lever I58. Since this lever was latched by shoulder I66 in its operated position, and is connected through link we to the actuating arm I82 for pawl I62,said pawl is held out of engagement with the ratchet 22 until the depressed stop member I38 strikes said lever and moves the same off of the shoulder I66. Spring I16 then returns said lever to its normal, unoperated posit1on against stop I12, and the spring II6 moves pawl 162 into engagement with ratchet 22, thus stopping the carriage in this position and-completing the tabulating operation. It will there-- fore be understood that after the printing of each group of characters, the tabulating lever I92 is operated to properly space the carriage in accordance with the pre-selected setting of the tabulating stops iSB for printing the next succeeding group of characters.

- In-order to restore or wipe out the tabulatingv stops setup on drum 32, it is necessary to first space the carriage to a point near its extreme right hand position or beyond the last set-up tabulating-stop, and then operate tabulating lever I92 before the carriage return lever 200 is operated.

'When the carriage return lever 200 is operated, latchdog 84 is disengaged from arm 80 on the shaft I6, thus permitting spring 82 to move clutch collar 64 into engagement with clutch member 56 on gear 68, thereby operatively connecting power driven shaft 14 with gear 26 and gear 'on sleeve l6 and rotating gear 29 in a clockwise direction to move rack l and the type carriage to the left towards its starting position. The friction means between sleeve 44 and gear 48 is so adjusted as to permit of a certain amount of slippage, and thereby eliminate shock or jerk instarting the carriage on its return movement. The major portion of this return movement of the carriage is eifected by the toothed engagement of gear 48' with gear 26. However, as the carriage nears its ultimate left hand or starting position, roller 94 on decelerating arm 28 will enter slot 95 on-cam 69 at approximately the same time as the teeth of gear 48' move out of mesh with the teeth on gear 28 at one end of the untoothed or interrupted section 62 of the latter gear as seen in Figure 3. speed will then be transmitted to sleeve 16 and gear 20 as roller 94 progressively moves inwardly in slot 96 towards the axis of gear 48. This produces a variable leverage between cam 60 and arm 28 which changes rapidly as the roller 94 moves toward the aXis Of gear 48, as shown in Fig. 2, thereby effectively decelerating or slowing the final return movement of the carriage to its starting position, and eliminating shock or jar.

' Of course, in this power return movement of the carriage, energy is stored in the spring 98, and as the carriage reaches its final starting position, trip arm 36 on drum 32 strikes the upper end of pivoted finger 32 which moves stop lever l'58foif of the latch shoulder I66, whereupon said lever is returned to unoperated position by the spring H0. -At approximately the same time, the extension 92 of decelerating arm 28 strikes the declutching lever 99, thus rocking shaft 19 and disengaging clutch collar 64 from clutch member 66, saidcollar being retained in such disengaged position bythe latching engagement of dog 84 with the arm 80'on shaft 16.

Carriage return lever 299 is also connected throu h rod 206 and arm 2l2 with actuating rod l86-for the escapement pawl I92. Escapement pawl I 02 is by this means held out of engagement with spacing ratchet 22 during the carriage return movement.

In Figure 9 of the drawing, I have illustrated one arrangement of a tabulating key 2l6, a tabulating stop setting key 2 I8, and a carriage return key 220 in a conventional typewriter keyboard. Any suitable motion transmitting connections (not shown) may be provided between these keys and the parts I18, I42 and 84, respectively.

From the above description and the accompanying drawings, it is believed that the construction, operation, and several advantages of the present invention will be clearly and fully under- Continued rotation at a decelerated stood. It will-be seen that I have provided, in a simple and compact machine organization, a novel assembly, in which the spacing movements of the carriage for tabulating printing are eflected by an energy storing device, while the return movement of the carriage to its starting position is effected by power operated means, during the operation of. which energy is stored in said device. The simple and novel means which I provide for decelerating the return movement of the carriage by said power operated means. whereby destructive shock or jar to the parts of the mechanism is avoided, is also an important feature of my invention. Furthenit will be noted that I have materially simplified the tabulating mechanism and embodied therein means which automatically operates to restore the selectively settable tabulating stops to their unoperated positions in the return movement of the carriage. Also, the large number of the selectively operable tabulating stops mounted in the rotating drum of minimum diameter is a distinctively novel feature of the present improvements. It will be noted that the power operated carriage return mechanism will function to positively and quickly return the carriage to starting position under all conditions of use of the machine, and will operate with equal efficiency when the machine is mounted on a horizontally fixed support or is operated on shipboard, in airplanes, or other moving vehicles, which may from time to time assume various angular positions with respect to the horizontal.

Finally, it will be seen that the several cooperating parts of the tabulating and escapement spacing mechanisms for the carriage as-well as the power return mechanism are of very simple and durable structural form, whereby the production cost of recording machines of this type is materially reduced, and maximum high speed operating efficiency with minimum maintenance expense is assured.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is:

1. In recording mechanism, means for effecting recording operations including a movable carriage, power operated means for moving said carriage in one direction to starting position, means for releasably connecting said power operated means to a power source, a spring connected with a part of said power operated means and operable when said means is disconnected from the power source to move the carriage in the opposite direction, said spring being ten' sioned in the power operation of the carriage, means controlling movement of the carriage under the action of said spring for character spacing on a record sheet, and means for simultaneously effecting operation of said connecting means and said control means to establish an operative connection of said power operated means with the power source and render said control means inoperative in the return movement of the carriage to starting position.

2. In a recording mechanism, means for ef fecting recording operations including a movable carriage,I means controlling movement 'offlsaid carriage'in-Jone direction fori characterspa'cing on a record sheet, .power actuated means operatively. connectedwithna part. of said last named means to return said carriageto startin'giposition, andcoacting means carried by said controlling means and. said power actuated means for decelerating movement of saidcarriagein its approachtos'tarting position.

: In a recording mechanisni'as defined in claim 2, said power actuated means including means for progressively increasing the power value transmitted to the carriage in the initial portion of its return movement.

4. In a recording mechanism, means for effecting recording operations including a movable carriage, power operated means for moving said carriage in one direction to starting position, means controlling movement of said carriage in the opposite direction for character spacing on a record sheet, said power operated means including driving and driven members provided with coacting means for direct interrupted transmission of power to the driven member, and coacting variable leverage elements carried by said members to decelerate movement of the driven member relative to the driving member in the approach of the carriage to starting position, said elements comprising a cam fixed to one of said members and a decelerating arm on the other member coasting with said cam when direct transmission of power to said driven member is interrupted.

5. Recording mechanism as defined in claim 4, together with means for releasably connecting said power operated means with a power source, and means carried by one of said elements to actuate said last named means and disconnect the power operated means from said source.

6. In a telegraph printer having a movable carriage, an energy storing device, a member connecting said device with the carriage and operable when said device is energized to move the carriage in one direction, means responsive to function operating means of the printer to govern the action of said energy storing device and position the carriage for character printing on a record sheet, power means responsive to other function operating means of the printer, and mean drivingly connecting said power means with said connecting member to move said carriage in the opposite direction to starting position and energize said energy storing device, said last-named means including means for decelerating the approach of the carriage to starting position.

7. In a mechanism for moving a mass and gradually retarding the movement thereof, a driving gear and a driven gear, a clutch mechanism associated with said driving gear, a laterally moving member comprising the mass associated with said driven gear, means rigidly connected to both of said gears to gradually change the speed relation between the driving gear and the driven gear, cooperative means associated with both of said gears to disengage the gear mesh and engage said rigidly connected means, and further means to operate said clutch mechanism with relation to said driving gear.

8. A mechanism for decelerating the movement of a moving mass to a stop position including a power driven gear operated through a clutch mechanism; a second gear connected to the moving mass; a decelerating cam associated with said power driven gear, said decelerating cam comprising a grooved member whose groove extends from the approximate peripheryof said gear to the approximate center thereof; adecelerating arm associated with saidsecond gear adapted to enter the groove of said decelerating cam near the end of thereturn movement of said mass to gradually reduce the rotative speed of said second gear with: relation to the speed of said. power driven gear; said second gear. having a blank space in the toothed area thereof; and declutching means to disengage said clutch mechanism when the mass has reached its stop position.

9. In a recording device in which the record is produced in successive lines, a carriage movable horizontally for the length of a line of recorded elements; a power drive; a clutch mechanism associated with said power drive; a spring driven spacing mechanism for advancing said carriage step by step to permit the recording of elements on a record sheet; power operated means to return said carriage to its starting position including a pair of intermittently intermeshed gears one of which is geared to said movable carriage and the other geared to said power drive through said clutch mechanism; a decelerating arm fixed to one of said gears; an enclosed decelerating cam fixed to the other of said gears, said decelerating arm and said decelerating cam being arranged with respect to each other and the gears to which they are attached in a manner to engage each other upon release of the intermittently meshed gears near the end of the carriage return movement; said gears then becoming inoperative and said decelerating cam active to gradually decelerate the return movement of said carriage to its stop position.

10. In a printing recorder including printing means movable across a record sheet to print successive lines of characters thereon, spring operated means to move the printing means step by step during the printing operation, a clutch mechanism, means to return the printing mechanism to its start position for printing a new line including a power driven gear operative through said clutch mechanism and a second gear in mesh with said power driven gear and said printing means, a cam fixed to said power driven gear and provided with a groove in curved form extending from the approximate periphery to the approximate center of said gear, a decelerating arm fixed to said second gear and adapted to enter the curved groove in the decelerating cam of said power driven gear, and second gear having a blank space in the toothed portion thereof, and means to operate said clutch mechanism.

11. In a telegraph printer a type printing mechanism movable across a stationary record sheet for printing in successive lines, spring tensioned means to advance said printing mechanism step by step during printing operations, a clutch mechanism, means to return said printing mechanism to its start position including a driving gear associated with said clutch mechanism and a driven gear associated with said printing mechanism, cooperative means comprising a decelerating cam fixed to said driving gear and. a decelerating arm fixed to said driven gear to gradually reduce the speed of said driven gear and said printing mechanism when the latter ap-- proaches its stop position, and further means to disengage said clutch mechanism at the end of the return movement of said printing mecha- EDWARD E. KLEINSCHMIDT.

(References on following page) REFERENCES CITED fi1e of this patent:

UNITED STATES PATENTS 5 Number Name Date 473,236 Reed Apr. 19, 1892 550,447 Greene et a1 Nov. 26 1895 695,203 Gilmore Mar. 11, 1902 10 784,585

Myers Mar. 14, 1905 Number 12 Name Date Smith Mar. 4,1913 Grotjohann June 3 1919 Gleim Aug. 30, 1927 Kurowski Aug. 7, 1928 Thomas May 10, 1932 Crumrine May 2, 1939 Helmond Dec. 5, 1939 Mills Dec. 10, 1940 Khalil Oct. 7, 1941

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