US1954472A - Typewriting machine - Google Patents

Description

April 10,1934. w. A. DQBSON TYPEWRITING MACHINE Filed Jan. 26, 1932 3 Sheets-Sheet 1 April 10, 1934. A DBSON 1,954,472

TYPEWRITING MACHINE Filed Jan. 26, 1932 v 3 Sheets-Sheet 2 M H g,

l 'IIIIIIIII U/ZVM M BY v 'ATTOR m April 10, 1934. w DOBSQN 1,954,472

' TYPEWRITINQ MACHINE Filed Jan. 26, 1932 3 Sheets-Sheet 3 INVENTOR:

' WWW Patented Apr. 10, 1934 PATENT OFFICE TYPEWRITING MACHINE William A. Dobson, Bridgeport, Conn., assignor to Underwood Elliott Fisher Company, New York,

N. Y., a corporation of Delaware Application January 26, 1932, Serial No. 588,980

14 Claims.

This invention relates to tabulating mechanism in typewriting machines, and is shown as embodied in anUnderwood portable machine. The invention is especially designed for machines of compact and light construction, where consideratrol. When the carriage is arrested, the jar is unnoticeable or very slight and does not harm the machine or disorder its adjustments.

An efficient and sensitive brake-mechanism, suitable for portable machines, positively controls the light and speedy carriage, and minimizes the shock and noise of carriage-arrest. The action of the brake is made directly proportional to the power of the carriage-driving spring-motor.

According to this invention, the key holds a brake-pad against a friction surface on the released carriage, to retard the latter. An automatic regulation of brake-pressure depends in ,part upon the brake-surface, which extends longitudinally of the carriage, but is a little inclined relatively to the direction of carriage-travel.

A yielding connection is provided between thetabulator-key and the brake-pad. The depressed tabulator key is arrested by a stop. The yielding connection causes the brake-pad to follow as the inclined braking-surface recedes, and always to press against said braking-surface. The inclination is such as to recede from the beginning to the end of the run of the carriage. At the beginning, the tension upon the spring key-connection is at a maximum, but as the carriage travels, the incline recedes, and the braking-pad follows the receding incline, so that the tension of the spring-connection automatically grows weaker; inasmuch as the key remains in its fullydepressed position against its stop. Hence when the carriage-driving spring tension is greatest, at the beginning of the line, the pressure of the brake-pad is the greatest; but as the propelling spring drives the carriage, the brake-pad follows the receding incline, and correspondingly weakens the tension of the spring-connection between the braking-pad and the depressed tabulator-key. Hence the pressure of the brake, or its eifectiveness, varies in correspondence with the variation in the power of the carriage-driving spring, being greatest when the carriage-spring power is greatest, and being weakest when the carriage-spring power is weakest. In this way a substantial automatic control, tending to uniformity of action, is kept upon the released carriage, which is prevented from attaining unduly high speed and consequently from causing any injury from violent arrest at the completion of the tabulating operation.

The carriage-driving spring and the brakespring may be so proportioned that the speed of the released carriage may be substantially uniform throughout the run of the carriage. Or, in other words, the tabulating speed of the carriage may be gained by means of an adjustment controlling the tension of the brake-spring.

There is also provision for adjustment of the parts of the tabulator-mechanism that are carried by the machine-frame, to be made at the same time as the usual adjustment of the platen relatively to the type-bars.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a front perspective, showing parts of an Underwood Portable typewriter with the present invention applied thereto.

Figure 2 is a cross-sectional elevation of the typewriter with the novel tabulator-mechanism mounted therein and shown in normal position.

Figure 3 is a front diagrammatic view, showing the platen-carriage at the extreme right position and being pulled towards the left by the fully wound-up carriage feeding or propelling spring, and showing the tabulator-brake operated and applying its greatest pressure against the beveled carriage-base plate.

Figure 4 is a view similar to Figure 1, but the parts in operated position.

Figure 5 is a similar view to Figure 3, but shows the platen-carriage near the end of its return movement, with itspropelling spring unwound and the tabulator-brake applying little or no pressure against the carriage-base plate.

Figure 6 is a front perspective, showing a modified form of locking the escapement-wheel when the latter is released from the carriage-feeding rack.

The depression of a tabulator-key 10 swings a tabulator-lrey-lever l1 and, through a bell-cranklever 12, tilts and pulls forward a U-shaped slide 13. This slide 13, through a slot-and-pin connection 14, 15, swings an operating lever 16, which shows in turn swings a tabulator-stop-lever 17, so that a releasable stop 18, formed by bending up the left end of said lever 17, is brought into the path of carriage-tabulator-stops 19, adjustably mounted on a carriage-rack-bar 20. Simultaneously said depression of the tabulator-key 10, through the intermediary of the levers 11, 12 and slide 13, rocks a system of two bell-crank-levers 21, 22,

joined together by a tie-rod 23, so that a roll 24, I

freely mounted on a stud 24" fixed on one end of the bell-crank-lever 22, will shift a carriagefeed rack 25 out of mesh with an escapementpinion 26, by swinging ears 27, outturned at the ends of said rack 25, rearwardly about pivots 28, thereby releasing the carriage 29 from the action of an escapcment-wheel 30, under control of the feeding dogs 30 and secured to the rear side of said pinion 26, so that the escapement-wheel 30 and the pinion 26 rotate in unison. The frame of the carriage 29 includes a base-plate 31, extending over its entire width, two end plates 32, 33, secured at each end of said base-plate, two parallel runways or rails 34, 35, formed on the side edges of said base-plate and the tabulatorstop-carrying rack-bar 20 which acts as a tie-bar between said endplates 32, 33 at the back of the carriage.

These runways 34, 35 support the carriage by cooperating with similar but reversed stationary runways 36, 37 forming parts of a. shift frame 38 of the machine. Anti-frictional elements 39 are disposed between each adjacent pair 34, 36 or 35, 37 to provide a free, light-running carriage.

The main frame 40 of the machine includes a back plate 41, side plates 42 and a comb-plate 43 at the front, these elements being secured together with screws to form a rectangular main frame.

A spring-motor 44 has a tape 45 hooked at one end over the head of a screw 46 between the two flanges of a motor-drum 47, mounted on said shift frame 38, while the opposite end of the tape is secured at 48 under the base-plate 31 of the carriage.

When the carriage-feed-rack 25, by the depression of the tabulator-key 10, is thus released, said spring-motor tends to pull the carriage 29, in letter-spacing direction, until the desired carriagestop 19 meets the stop 18 that was shifted into the path of the stop 19 by depression of the tabulator-key 10.

To prevent excessive jarring and noise of impact produced by the contact of a stop 19 with the stop 18, the pulling action of the spring-motor 44 on the carriage is automatically braked proportionately to its power, i. e., when the springmotor is fully wound up by the return of the carrlage to begin a new typing line, the brake automatically acts very strong, and during the travel of the carriage in letter-feeding direction when .the spring-motor, is unwinding, the brake automatically becomes weaker and will be practically ineffective when the carriage is near the end of the typing line and the spring-motor is almost completely unwound. This is accomplished by means of a releasable leather braking-pad 49 cooperating, when the tabulator-key 10 is depressed, with an incline or ramp 50 formed under the baseplate 31.

This braking-pad 49 is actuated to become effective by the depression of the tabulator-key 10, which simultaneously operates the tabulator-stop 18 and the carriage-feed-rack 25, through the angular displacement of the free end of the bellcrank-lever 21. To this free end there is connected at 51' a spring 51, the other end of which is hooked at 51 to the free end of a link or pullrod 52 pivoted to the joint 53 of a toggle 54, 55. The lower link 54 of said toggle pivots about a stud 56, fixed to the shifting frame 38, while its upper link 55 is pivoted at the free end 58 of an arm 59, pivotally mounted on said shifting frame 38 at 60 and carrying the braking pad 49.

The shifting frame 38 is formed by a rear cross-plate 61 extending obliquely over the entire width of the frame and two end plates 62, and is suspended within the stationary frame 40 of the machine from the free ends of two pairs of levers or arms 64 and 65, the upper levers 64 being pivoted at 66 to the side plates 42 of the frame 40, while the lower levers form the side arms of a bail, the back rod 67 of which extends across the machine through and between said side plates 42.

These levers or arms 64, 65 are arranged to give a platen 68, pivotally mounted on the carriage 29, a linear motion substantially parallel to the face of atype 69 when printing. For manually shifting said platen 68 from lower-case to upper-case position, a 'case-shift key 70 and a lever 71 are provided on each side of the keyboard 72. Said levers 71 are fulcrumed on studs 73, so that depression of the key 70 causes an arm 74 to rise and engage the shiftable carriageframe structure 38 at studs 75 secured to the end plates 62. The right-hand stud 73 is fastened to an inwardly projecting boss 76 of the right side plate 42 of the stationary frame 40, and serves furthermore as a. fulcrum for the tabulator-key-lever 11 and for the bell-cranklever 12, a shim or washer 77 being interposed between the right shift lever 71 and said tabulator-key-lever 11.

The front vertical part of this key-lever 11 works in a slot 78 of the comb 43. The bottom 79 of the slot 78 acts as a stop to limit the downward stroke of the tabulator-key 10. To the downwardly projecting rear arm 11 of said tabulator-key-lever 11 is hooked a return spring 80 anchored to an anchor-plate 81 secured to a cross-bar 82 of the machine-frame 40. The return movement of the tabulator-key 10 is limited by a stop 162, against which the lever 11 is normally held by the spring 80.

The front end of the bell-crank 12 is adjusta screw 83 working in an arcuate slot 84.

The U-shaped slide 13 is supported on a bracket 85, secured with screws 86 to the right end of a cross-bar 87, by'means of a collar-screw 88 slidably mounted in a horizontal slot 89 provided near the top of said bracket 85.

The lower end of the operating lever 16 is fulcrumed about a collar-screw 90 to a forwardly projecting ear 91 of a bracket 92 secured to the oblique plate 61 by means of screws 93. This bracket 92 presents a front projection 94, on which the bell-crank-lever 21 is pivoted about a stud 95.

An opening or slot 96 is provided in the oblique plate 61 for said operating lever 16. The front edge 97 of the upwardly extending rear portion of the U-shaped slide 13 co-operates with the bell-crank-lever 21 through the intermediary of a forked connecting-member 98 pivoted at 99 to said lever 21.

The tabulator-stop-lever 17 presents. a middle raised portion 100, which is fulcrumed about a stud 101 ,to an upwardly projecting ear 102 of a bracket 103 carrying the marginal stop-lever (not shown) and fastened under the rear carriage-rail 37 by screws 104 to a rearwardly projecting flange 105 of the oblique plate 61. The right-hand end of said taubulator-stop-lever 17 is offset downwardlyand projects to the rear at 106. An openingor slot 107 is provided in said rear projection 106 to receive'thefree upper end of the operating lever 16.

Thelupturned left-hand end of the tabulatorstop-lever 17 forms the frame-tabulator-stop 18,

, which co-operates with the carriage-tabulatorstops 19 in the usual way. Each stop 19 has a v forked lower part bestridden on the rack 20 and carries a spring 108, the free end of which presses against the rear side of the adjacent rear tooth 109 of said rack 20 so as to hold the stop fast in its set position bestridden upon the rack 20.

On the upper side of this rack is marked the usual scale .110. The rack is secured at both ends on inwardly projecting flanges 111 of the end plates 32 of the platen-carriage 29. i

The teeth 109 of said rack are provided on the front and rear sides thereof at the spacing or pitch of the carriage-feed rack 25.

The rack 20 carries furthermore a left-hand marginal step 112 and a right-hand marginal stop 113, which co-operate with the usual ,mar-

ginal-stopmechanism (not shown).

The bell-crank-lever 22 swings about a screw 126 fixed on a bracket 127. This bracket 12'? is secured at its front end to an ear 1% of the frame-runway 36 and at its rear end to the oblique plate 61.

The right end of the tie-rod 23 is hooked at 129 to an upwardly projecting flange 130 of the bell-crank-lever 21, while its left end is hooked through the bell-crank-lever 22 at 131 and presents a projection 132, to which is anchored a spring 133, controlling a pawl 134. This pawl is pivotally mounted at 135 on a bracket 136 secured to the oblique plate 61. When the tabulatorkey 10 is depressed, said spring 133 is tensioned and swings the free end of said pawl 134 into the path of the teeth of the escapement-wheel 30, thereby holding the latter in its angular position when the rack 25 is swung out of engagemen with the pinion 26.

The carriage-feed rack 25 is provided at its middle with a reinforcing flange 138 with a lateral trunnion 139, which is pivotally mounted in a bracket 140, secured on the base-plate 31 of the carriage 29, so as to prevent bending of said rack by the action of said roller 24.

At the right-hand end of the platen-carriage 29, there is provided the usual rack-release lever 145 having at' its upper end a finger-piece 146, and being submitted to the action of a return spring 147 that is effective to normally hold the rack 25 in engagement with the escapementpinion 26 through the front end of said lever 145 having an open slot 148 straddling a projection 149 of the right-hand ear 2'1 of the carriage-feed rack 25.

The escapement-pinion 26 and the escapement-wheel 30 have the same number ofteeth, andare pivotally mounted on a stud 150 secured to the oblique plate 61. A pawl 151 prevents rotation of said pinion 26 in clockwise direction.

From the foregoingit will be understood that when the key" 10 is released, the return spring restores the parts 11, 12, 13, 16 and 1'7 to their normal positions, while the spring 147 swings the rack 25 into engagement with the pinion 26, thereby restoringthe roller 24, the bell-cranklevers 22, 21,and the pawl 134 to their normal positions and releasing the springs .51 and 133. At the same time a spring 152, connected at one end to a pin 153 on the plate 61 and at the other end to the toggle-link 55, returns the arm 59 with its brake-shoe 49, together with the toggle 54, 55 and the pull-rod 52, to their normal'positions.

The depression of the tabulator-key 10 rocks the bell-crank 21 to pull the link 52 throughthe spring 51 and open the toggle 54, 55, to swing up the arm 59 and press the brakepad 49 against the carriage-base plate 31. The tabulator-key 10, when operated, isalways depressed the same distance, namely, until its lever 11 contacts with the stop 79 to rotate the flange or arm 130 of the bell-crank 21 through a fixed arc, and thereby pull the spring 51 at its end 51* through a definite distance, which, in turn, will act-to displace thelink 52. It will be noted that theamount of displacement of the link 52 will vary according to the position of the carriage 29, since the distance between the brake-pad 49 and the carriage-base plate 31 varies during the endwise travel of the carriage due to the incline 50 on the plate 31, so that the spring 51 will be tensioned an amount determined by the position of the carriage.

In Figure 3, the carriage is shown in position to start a new typing line and the incline 50 is nearest to the brake-pad 49, so that the parts 49, 54, 55, 59 can only be slightly depressed before the pad 49 will press against the carriage base plate 31. Since the arm 130 is given thesame displacement at each operation of the tabulatorkey 10, the spring 51 will be highly tensioned and will press the pad 49 against the carriagebase plate 31 with a strong force to create a very effective brake. As the carriage moves in letterspace direction the plate 31 recedes from the brake-pad 49, so that the parts 49, 54, 55, 59 are being constantly displaced during the movement of the carriage, causing the spring 51, together with the brake pressure, to become weaker, and, when the parts are in the position in Figure 5, where the carriage is shown near the end of its typing line, the spring 51 is practically inefiective to exert any pressure on the pad 49 against the plate 31. 7

When the carriage is in Figure 3 position, the carriage-propelling spring 44 is fully wound up and exerts its heaviest pull on the carriage the spring 44 is nearly unwound and exerting only a moderate pull on the carriage, while the brake 49 is almost inefl'ective. In this manner, the speed of the carriage, regardless of its endwise position, is always controlled to travel at a predetermined rate of speed when released from its escapement by the depression of the tabulatorkey 10. The speed at which the carriage is to travel is determined by the retarding pressure of the brake 49 against the carriage, which pressure may be suitably regulated to obtain a predetermined rate of travel of the carriage by means of an adjustable anchor-screw 154, supported in a bent-over portion 155 at the top of the arm 130 and held in adjusted position by a pair of holding nuts 156. The end of the screw 154 has an eye-portion 157, into which the end 51' of the spring 51 is anchored, so that by tuming the screw 154, the spring 51 will be brought nearer or further away from its operating arm 130, thereby enabling the latter to apply more or less of a pull on the spring 51 when operated by the tabulator-key 10.

Figure 6 shows a modified construction to hold the escapement-pinion 26 in alignment with the rack 25 when the latter becomes disengaged during the tabulatlng movement of the carriage.

For this purpose the extension or arm 158 is fixed to the bell-crank 21 on the lower side of its arm carrying the rack-releasing roll 24. This extension is mounted on the bell-crank by a rivet 159, and is prevented from rotating by curving its inner end 160 to conform with and lie against a hub 161 forming part of the bell-crank 22. The outer end of the extension 158 normally lies in front of the teeth of the pinion 26, and is moved between said teeth upon rotation of the bell-crank 22, by depression of the tabulatorkey 10. The extension will engage the teeth of the pinion 26 before the roll 24 on the bell-crank 22 has been moved far enough to release the rack 25 from the pinion 26, thereby preventing said pinion from rotating and getting out of alignment with the rack 25, and enabling the rack to enter the teeth of the pinion when the latter is lowered to normal position upon release of the tabulator-key 10.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a carriage, means for propelling said carriage, and mechanism for letter-spacing said carriage, of means for releasing said carriage, and devices for applying a frictional braking force effective to restrain the carriage when released, said frictional devices including means to automatically diminish the friction according to the extent of advance of the carriage.

2. In a typewriting machine, the combination with a power-driven carriage, and letter-spacing mechanism, of means for releasing said carriage, and devices for applying a braking force effective to restrain the released carriage, including a depressible key, a stop to limit the depression of said key, a brake pad to frictionally engage said carriage when the latter is released from its letter-spacing mechanism, a spring connection between said key and pad whereby the depression of said key first moves said pad into engagement with said carriage and tensions said spring, and means on said carriage to diminish the effectiveness of said spring as the carriage advances, and thereby weaken the braking pres sure on said carriage.

3. In a typewriting machine, the combination with a power-driven carriage, and letter-spacing mechanism, of a tabulator-key-lever, a stop to limit the movement of said lever, means controlled by said lever for releasing said carriage, and means for applying a variable braking force to the released carriage to retard the same, said last-mentioned means including an inclined plane for said carriage, a brake pad to engage said inclined plane upon depression of said tabulator-key, 'and a spring connection between said key and said pad, whereby depression of said key-lever moves said pad into engagement with said inclined plane and tensions said spring, the tension of said spring being automatically varied by said inclined plane by means of the travel of said carriage.

4. In a typewriting machine, the combination with a spring-propelled carriage and a letterspacing mechanism, of means for releasing said carriage, and braking devices including a brake pad, a depressible key, a stop to limit the movement of said key, a train of mechanism connect ing said pad and key whereby said pad upon depression of said key will be forced against said carriage, an inclined plane on said carriage, said pad engaging said inclined plane torestrain said carriage, and a flexible connection included in said train of key mechanism to yieldingly retain said pad against said inclined plane on the carriage when said key is held against said stop, to automatically vary the braking force according to-the position reached by the carriage.

5. In a typewriting machine, a main frame, a shift-frame, a platen-carriage supported by said shift-frame, a carriage-escapement and a releasing device therefor, a carriage-brake supported on said shift-frame, tabulator-stops settable on said carriage, a tabulator-key-lever on said main frame, a counter-stop on said shift-frame normally out of the path of travel of said tabulatorstops, a sub-lever mounted on said shift-frame and connected to said tabulator-key-lever for swinging said counter-stop into the path of said tabulator-stops on the carriage, a bell-crank pivotally supported on said shift-frame and operated by said tabulator-key-lever, and links connected to said bell-crank, one of said links operating said escapement release, while the other link operates said carriage-brake.

6. In a typewriting machine, a main frame, a shift-frame, a platen-carriage supported on said shift-frame, a carriage-escapement and a releasing device therefor on said shift-frame, a carriage-brake supported on said shift-frame, tabulator-stops settable on said carriage, a tabulator-key-lever on said main frame, a counter stop on said shift-frame normally out of the path of the travel of said tabulator-stops, a sub-lever pivotally mounted on said shift-frame and connected to said tabulator-key-lever and said main frame for swinging said counter-stop into the path of said tabulator-stops on said carriage, a bell-crank pivotally supported on said shift-frame and operated by said tabulator-key-lever, and means connected to said bell-crank for operating said escapement release and said carriagebrake; the connections of the bell-crank and sublever to the tabulator-key-lever including a member on the main frame loosely connected to said bell-crank and sub-lever on the shift-frame, and

operable by depression of said tabulator-keylever to impart the same operating motion to said sub-lever and bell-crank whether the shift frame is in normal or shifted position.

'7. In a typewriting machine having a releasable carriage, a carriage-tabulating mechanism including a key, a brake-pad controlled by said key, and a friction surface co-operating with said brake-pad to retard the released carriage; means being dependent upon the movement of the carriage for varying the pressure between the pad and the friction surface.

8. In a typewriting machine having a releasable carriage, a carriage-tabulating mechanism including a key, a brake-pad controlled by said key, and a friction surface co-operating with said brake-pad to retard the released carriage; means being dependent upon the movement of the carriage for varying the pressure between the pad and the friction surface, a spring for driving said carriage; the tension of said spring decreasing substantially from the beginning to the end of the travel of the carriage in tabulat ing direction, and the carriage-retarding friction decreasing accordingly; and means for manually regulating the pressure of the friction-pad.

9. In a typewriting machine having a platen, a carriage therefor and a case-shiftable trackframe upon which the carriage runs, a tabulatorkey at the keyboard of the machine, a driver mounted upon the framework of the machine and connected to said key to slide forwardly and backwardly, a lever mounted upon said shiftable carriage-track-frame and having a pin-and-slot engagement with said driver to be operable thereby at difierent case-shift positions of the carriage-track-frame, a lever extending along the carriage and .pivoted thereto and connected to the first-mentioned lever, a stop provided upon said carriage-lever, and adjustable column-stops co-operable with said carriage-stop.

10. In a typewriting machine having a platen, a carriage therefor and a case-shiftable trackframe upon which the carriage runs, a tabulatorkey at the keyboard of the machine, a, driver mounted upon the framework of the -machine and connected to said key to slide forwardly and backwardly, a'lever mounted upon said shiftable carriage-track-frame and having a pin-and-slot engagement with said driver to be operable thereby at different case-shift positions of the carriage 'track-frame, a lever extending along the carriage and pivoted thereto and connected to the first-mentioned lever, a stop provided upon said carriage-lever, adjustable column-stops cooperable with said carriage-stop, and a carriageto the first-mentioned lever, a stop provided upon said carriage-lever, adjustable column-stops cooperable with said carriage-stop, a bell-crank mounted upon the shiftable carriage-track-frame and operable by said driver at any position of the track-frame, a carriage-releasing element operated by said bell-crank, and a carriage-brake also operated by said bell-crank.

12. In a typewriting machine having a platen, a carriage therefor and a case-shfi ble trackframe upon which the carriage runs, a bulatorkey at the keyboard of the machine, a, driver.

mounted upon the framework of the machine and connected to said key to slide forwardly and backwardly, a lever mounted upon said shiftable carriage-track-frame and having a pin-andslot engagement with said driver'to be operable thereby at different case-shift positions of the carriage-track-frame, a lever extending along the carriage andpivoted thereto and connected to the first-mentioned lever, a stop provided upon said carriage-lever, adjustable column-stops cooperable with said carriage-stop, a bell-crank mounted upon the shiftable carriage-traok-frame and operable by said driver at any position of the track-frame, a carriage-brake also operated by said bell-crank, and including a power-transmitting spring connected to said bell-crank, a link to which the spring is attached, a powertoggle which is connected to said link, a lever which is moved by said toggle, and a friction-pad controlled by the last-mentioned lever, said carriage having a friction surface against which said pad is moved by the lever.

13. In a typewriting machine having a platen, a carriage therefor and a case-shiftable trackframe upon which the carriage runs, a tabulatorkey at the keyboard of the machine, a driver mounted upon the framework of the machine and connected to said key to slide forwardly and backwardly, a lever mounted upon said shiftable carriage-track-frame and having a pin-andslot engagement with said driver to be operable thereby at different case-shift positions of the cariage-track-frame, a lever extending along the carriage and pivoted thereto and connected to the first-mentioned lever, a stop provided upon said carriage-lever, adjustable column-stops cooperable with said carriage-stop, a bell-crank mounted upon the shiftable carriage-track-frame and operable by said driver at any position of the track-frame, and a carriage-brake also operated by said bell-crank, and including a powertransmitting spring connected to said bell-crank, a link to which the spring is attached, a powertoggle which is connected to said link, a lever which is moved by said toggle, and a friction-pad controlled by the last-mentioned lever, said carriage having a friction surface against which said pad is moved by the lever, said" friction surface being slightly inclined relatively to the direction of travel of the carriage.

14. In a typewriting machine having a powerdriven carriage, a carriage-tabulating mechanism including, in combination, a carriage-releasingkey, a stop for arresting the movement of said key, a brake-pad brought into action by said key, and a friction surface co-operating with said brake-pad to retard the released carriage; tensioned yielding means connecting the key to the pad and reduced ineifectiveness by the movement of the carriage, for enabling the traveling carriage to decrease the friction pressure automatically while the key remains arrested by said. stop.

WILLIAM A. 7 DOBSON;

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