US1261718A - Automatic carriage for type-writing machines. - Google Patents

Description

APPLICATION FIUED APR. I3. 19!].

Patented Apr. 2, 1918. 5 SHEETS SHEET INVENTO R WITNESSES ATTORNEY R M. DAVIS. AUTOMATIC CARRIAGE FOR TYPE WRITING MACHINES.

APPLICATION FILED APR-13.1911.

Patented Apr. 2, 1918.

5 SHEETS SHEET 2.

INVENTOR ATTORNEY R. M. DAVIS.

AUTOMATIC CARRIAGE FOR TYPE WRITING MACHINES.

APP LICATION FILED APR. 13, 1917.

Patented Apr. 2, 1918.

5 SHEETS-SHEET 3.

1am. 170241 VENT W. 5. EM

A'n'onnn R. M. DAVIS.

AUTOMATIC CARRIAGE FORTYPE WFHTVING MACHINES.

APPLICATION FILED APR. $3| 19H- Patented Apr. 2, 1918.

5 SHEETS-SHEET 4.

INVENTOR fifll. 1702a).? BY 4% 6204 41 WITNESSES ATTORNEY n. M. DAVIS.

AUTOMATIC CARRIAGE FOR TYPE WRITING MACHINES. APPLICAHON FILED APR. l3 l9!!- 1,261,71 8. Patented Apr. 2, 191&

5 SHEETPSHEET 5- INVENTOR WITNESSES M 62 722/5 2 Q m&

ATTORNEY BIGEARD M. DAVIS, OF WEST PITTSTON, PENNSYLVANIA.

AUTOMATIC CARRIAGE FOR TYPE-WRITIN G MACHINES.

Application filed April 13, 1917.

To all whom it may concern:

Be it known that I, RICHARD M. DAVIS, a citizen of the United States, residing at West Pittston, in the county of Luzerne andState of Pennsylvania, have invented new and useful Improvements in Automatic Carriages for Type-Writing Machines, of which the following is a specification.

This invention is an automatic carriage for a typewriting machine.

The usual method of operating the carriage of a typewriting machine to the right side is by hand and involves the lifting of the operators hand from the keyboard. Such an operation consumes time and is not productive of continuous work, as well as in volving additional labor.

The invention aims to overcome this disadvantage by providing a machine, the car- 'riage of which is manually propelled to the left and when, after having reached a predetermined point, the carriage is automatically returned to the right or starting point.

To this end, the invention, broadly stated, comprises an automatic carriage that is manually propelled toward the left, and after reaching a predetermined point, a stop is operated to move the pawls of the step-bystep mechanism out of engagement, thus permitting a spring, which has been wound by the progressive movement, to draw the carriage to the right hand side, the movement of one of the pawls contacting with a stationary stop member opcratingto prevent any movement of the universal bar by the key bars, the return to the right of the carriage'causing it to strike against a pivoted bumper to reduce the liability of ar an shock.

One practical form of the invention, and the manner of constructing and operating it, will be described and illustrated in the ac companying drawings, in which Figure 1 is a top plan view with broken away portions.

Fig. 2 is a rear elevation.

Fig. 3 is an end elevation with part of the side frame broken away.

Fig. 4 is a sectional view on the line 4--4 of Fig. 1. 0

Fig. 5 is a perspective view of the line spacing pawl and connecting parts.

Fig. 6 is a perspective View of the bell crank lever of the key-board operated line spacer.

Specification of Letters Patent.

Patented Apr. 2, 1918.

Serial No. 161,813.

Fig. 7 is a detailed top plan view of the back spacing mechanism.

Fig. 8 is an enlarged view of the mechanism operating the automatic line spacer.

Fig. 9 is an enlarged view of the mechanism shown in Fig. 8 at the moment of opginal stop bar with a removable stop in position thereon.

Fig. 12 is a sectional view of the ratchet wheel, sleeve, gear and shaft.

In the preferred embodiment illustrating the invention about to be described,the usual frame is employed. This frame consists of the side members 15 and 16 that are joined together at the front of the machine by means of the cross member 17. The top plate 18 is mounted upon the side members 15 and 16, to which it may be secured in any suitable manner. Mounted upon the top 18 and secured thereto are the carriage guide supporting members 19 and 20. These members may be secured, as shown, by the screws 21. These members 19 and 20 carry a guide rail 22, which may be of any usual type or form best adapted to perform its function, and is shown as being adapted to cooperate with rollers (not shown). Positioned a suit able distance below the guide 22 is another guide 23, which may be of the same shape as that of the guide 22.

Adapted to cooperate. with the guides 22 and 23 there is provided a carriage, which is provided with suitable bearing portions with grooves therein to correspond with the form and shape of the guides.

The carriage.

- The carriage comprises end members 24 and 25, and suitabl journaled therein is a shaft 26. This shat 26 is adapted to be secured to the platen 27 in any usual or customary manner. To revolve the platen 27 suitable hand wheels 28 ma be employed, and positioned exteriorly o the frames 24 and 25. The platen 27 carries at the left hand a ratchet wheel 29 by means of which the paper is advanced a line,at a time so as p to rovide the pro er line spacing.

it the lower 1e t side of the side member 24 there is provided a suitable attaching point 30, to which is secured the ribbon or tape 31 employed for drawin the car'- riage to-the right hand end of its travel. This ribbon or tape may be of any suitable material, and its other end is secured to a barrel 32-, in which is disposed a spring (not shown).

The carriage at the backend carries at its lowermost point a mar inal stop bar 33, which is shown moreclear y in Fig. 11. At suitable spaced points upon 1 this bar 33, there ard provided recesses 34, and to engagewith these recesses 34 there are movable 'stop members 35, one of which is shown in position in Fig. 11.

Pivotally mounted at the upper end of the carriage and also between the side members '24 and 25 is a bar 36 from which are suspended the members 37 and 38, which hold at their lower ends another bar 39. This bar 39 at its left hand and also carries a lever 40. This lever40 is provided at its outer end with a finger-hold 41 and at some point intermediate between the finger hold and its pivotal connection with the bar '39, there is provided a spring element 42 which is secured to it and the side member 24 of the carriage. Any usual form of connec-' tions may, be employed to suitably retain the spring in its operative position. Disposed upon one side of the lever 40, which will be called the line spacing lever is a stop 43, which is adapted to engage with the teeth of the wheel 29 mounted upon the left hand end of the platen 27. The line spacing lever 40 is provided with a cut-away portion indicated at 44, so as to be adapted to ride over the lower guide 23 without contacting therewith. The finger hold 41 is for thepurpose ofpermitting the lever 40 to be disengaged from the wheel 29 when it is desired to insert paper and bring it into a proper line ad ustment, either for.

correction or insertion.

The linefapacing mechanism.

The line spacing mechanism may be au- P tomatically operated by the return movement of the carriage to the right hand side of the machine, and to provide for this automatic action the marginal stop bar 33 is emplo ed. .-As. before described, this bar carries 1; e stop members 35 which are removable with respect to the bar. In 8 one of the stops is about to engage wit a pivotally mounted abutting member 45, which is provided with a projection 46 to engage with the stop 35. As shown in this Fig, 8, his abutting member 45 is provided with an upstanding portion 47 that is adapted to move the bar 39, which movement is shown more fully in Fig. 9, where the projection 46 is being'pushed out of the member 47 is contacting with the bar 39 and pushing it forward. This forward movement 1s communicated to the line spacing lever 40.

This pivotally mounted abutting member is provided with a resilient element 48, WhIClI is so secured that it will maintain this-member in the position shown in Fig. 8. The ends of this spring may be suitably secured in any convenient workman-like manner.

The above description applies more particularly to the automatic line spacing mechanism. To provide for manually operating theline spacing mechanism from the keyboard, a ke bar 49 is provided which is substantial y L-shaped, and the short limb of the L is indicated at 50. This lever is pivotally mounted, as indicated at 51. The upper end ofthis portion 50 is bent over and carries a substantially horizontal portion 52, which terminates in a vertical upstanding member 53, having a rounded end indicated at 54. The contacting face of this upstanding member 53 is adapted to contact with the bar 39 moving it forward, which then operates the line spacing lever 40. The paper then may be fed by finger pressure upon the key 55 so that the paper is fed forward or the platen is turned a distance.whichcorresponds to the width of one of the teeth of the wheel 29.

To maintain, the line spacing bar 49 in its proper position, a spring 56 is provided, one end of which is secured to the bar, as indicated at 57, while the. other end is attached to a pin or other suitable support 58. This pin 58 may be secured to the ide member 15 of the framework in any suitable manner.

Thus it will be seen from the description of the two types of line spacing mechanism that one is automaticallycontrolledupon the return of the carriage to the right hand end,'while the other provides for spacing the aper manually to any desired position with reference to the platen or to a guide line.

Carriage propell'mg mechanism.

To provide for moving the carriage from way by the stop 35, and this upstanding-154557 the right hand side to the left hand side,

a rack 59 is shown as being secured between the frames 24 and 25 of the carriage. This rack is so positioned that it will cooperate with a pinion 60 which is suitably journaled in a bearing 61. This bearing may be secured to the top 18 by means of the screws 62, a shown.

The pinion 60 is preferably provided with a barrel portion 63'so that the pinion may be secured to the shaft 64 in any Suitable or workmanlike manner, and also to provide for a longitudinal adjustment of the shaft 64 so that the pinion 60 will mesh properly with the teeth of the rack 59. The other end of the shaft 64 carries a bevel gear 65 which i adapted to mesh with another bevel gear 66 positioned at substantially right angles to the gear 65.

After the pinion 60 and its barrel portion 63 have been secured to the shaft 64 so that the bevel gear 65 will mesh correctl with the other bevel ar 66, the barre portion 63 may then secured to the shaft 64: so that the gearing will be maintained in operative alinement at all times.

In Fig. 12, the shaft is shown as having a slotted head 67, a bearing portion 68,8. shouldered end 69, and a threaded end 70. This threaded end passes into and is secured to the top 18 b means of a suitably threaded hole fame in the top 18.. As hown, the gear 66 is provided with a sleeveor bearin' portion 71, and terminates in the ratchet w eel 72, which is provided with any desired number of teeth, the teeth in this ratchet wheel-72 being spaced :1 art on the periphery to correspond with t e lettering of the type that may be employed with this machine.

To cooperate with the teeth-in this ratchet wheel 72 are the awls 73, 74, and 75. The pawl 73 is pivota y mounted with respect to the top 18, as indicated at 73, andthe pawl '74 has a pivotal mounting, as indicated at 76. The pawl 73 carrie at one end a pin 77,

which is a driving fit, so as to bemovable therefrom and yet fixedly mounted therein. The element 74 is not merely a pawl but a slidable member actuated from the universal bar. This pin 77 and its'cooperative relation to the other parts is shown more particularly in Fig. 4.

Near the engaging end of the awl 73, there is positioned another pin 78,w ich projects so that a sufiicient distance to aiford an attaching point to the spring 79 is provided. The other end of the spring 79 issuitabl4y secured to a pin 80 carried by the pawl 7 As shown in Fig. 1, the pawl 73 is substantially L shaped.

The pawl 74 is also provided with a pin 81 imi ar in character and which performs a somewhat simila1 function to the pin 77 carried by the pawl 73. The coiiperative relation of this pin 81 is also shown in Fig. 4. The pawl 74 is also provided with an engaging point 82 to coiiperate with the teeth of the ratchet wheel 72, and upon its opposite side. there is provided a shoulder portion 83 adapted to engage with a stop 84 when the pawl 74 nd the teeth 82 have been moved out of contactin relation with regard to the ratchet whee 72. The function of this shoulder and stop will be described hereafter.

of the machine.

Mounted above the pawls 73 and 74 is a bar provided with a long leg 85 and a short leg 86 positioned at right angles thereto and terminating in an upstanding portion 87. One side of the long leg 85 is provided with an otl'set portion 88, and adjacent this ofi'set portion ther is formed in the leg 85 a subtantially square hole 89. At suitable intervals of the longitudinal axis of this leg 85, there are formed elongated slots 90, 91 and 92. A perspective view of this bar is shown more particularly in Fig. 10. The pin 77 is adapted to IOJG'Ct upwardly through the slot 91 and t it: pin 81 is adapted to operate in the square hole 89.

The upstanding end 87 formed on the short leg 86 of the bar is adapted to cooperate with the stops 35 carried on the marginal space bar 33.

The movement of the carriage toward the left-hand side of the-machine moves one of the stops 35 into a contact relation with this upturned portion 87, and, as shown in Fig. 1, the pin 77 is in contact with the right hand end of the slot 91, and the in 81 is 'in contactwith the right hand sire of the square hole 89. A continued movement to the'left of the slot forces this bar to the left and actuatcs' the pawls 73 and 74- to disengage them from any ratchet-action with the ratchet wheel 72. At this time the carriage is not held, and the energy stored in the sirln serves to return the carriage to the -l'lgllt land end. As it approaches the right hand end another marginal stop 35 is employed to move the pawls in an opposite direction. tending to force them'to engage with the ratchet wheel 72. At the same time the spring 7 9 serves to draw the engaging ends into contact. This spring 79 exerts very little force to draw the pawls together, and is used more to overcome the inertia of the moving parts.

Secured to the underside of the top 18, are two L-shaped members, indicated at 93 and 91. Those are secured by means of the screws 95 in any suitable way. Positioned adjacent the lower ends of these L-shaped members is a transverse shaft or axle 96, which will be secured in position as indicated by the nuts 97. As shown in Fig. 3, these L-shapcd members are shown as being curved downu'ardlv and toward the front Disposed between those members 93 and 9-1 is an Lshaped lever 98.

adapted to In pivuinlly mounted upon and carried by the shaft 96, which is inu-rposed between and carried at the lower ends of the L-shaped members 93 and 94. One end of the lever so 1 :s apivotal connection indicated at 101 with the adjustable connecting link which comprises a clevis end 102, and a threaded stein 103 cooperating with an elongated nut- 10-1i. The elongated nut is suitably secured to ihe'univcrsal bar 105, as indicatcd at 1015". The adjustable connection formed lgy the parts 102, 103, and 104, permits var aliens in the control of the throw of the pawl 71. As shown in Fig. 3, when the space bar 106 or any of the keys and their connecting bars. one of which is shown at 107, are depressed, the universal bar tends to more upward and carry with it the connectiu ends cooperatively connected with the bell crank lever 98. Through tho-pivotal mounting 76, the screw 99 and the Slot 100 formed in the top 18, the pawl is given a forward movement, which by means of the detent 82, engages with one of the teeth of the ratchet wheel 72 and tends to rotate it. At the samethne the detent will engage a tooth, and the pawl 73 will. come into engagement with another tooth and prevent a backward movement of the ratchet wheel. {The forward movement of the pawl 74; advances the carriage the width of one letter, after the rotary motion of the ratchet wheel produces motion in the gear- ,'which is 'opcratively connected with the rack 59. -After the universal bar is ..released,'the pawl 74 is drawn backward ihto position for engaging with another tooth. To 'assist the universal bar in reage, they are pivotally mounted upon the turning to its normal position, suitable springs 108 areemployed.

In order that the key bars indicated at 109 may have the greatest amount of lcver shaft 110. As shown in Fig. 1, the universal bar is substantially L-shaped, and in Figs. 2 and 3, the springs 108 are shown encircling the stems 113 w rich are provided at one end with clevises 111. The spring 108 keeps the key bar in engagement with its clevis. The stems 113 are adaptedto extend through a distance bar 114, which cooperates with the side members 15 and 16. As shown, this distance bar 114 is rectangular or I-shaped, so as to provide a large bearing surface for one end of each of the springs 108, when they are put under compression by a downward pressure, at which time the clevises contact with them.

As the carriage is moved pro essively m a step-by-step manner toward t e left hand side of the machine, the spring contained in the spring barrel 32 has energy stored therein by means of the tape 31, which 13 adapted to rotate the barrel. This forward movement of the carriage is accomplished manually, which is in contradistmction to the the right.

and a threaded shank portion 128.

maintain the-keyhar in the bank of keys of the keyboard. This key 115 is connected to a suitable L-shaped lever having the legs 116 and 117 This L- shaped lever is provided with a' pivotal mounting, indicated at 51. The upper end of the leg 117 is provided with a hole 119, which is adapted to cooperate with a pin or other suitable .bearin 1'20.- This afiords a' connection with the cpending portion 121 of another L- or bell-crank lever havin the members 122 and 123. T is belLcrankTever a indicated at'124.

has a pivotal mounting,

of the member 123,

Ad'acent the outer end a pivotal connection 125 is provided so as to cooperate with the shiftingbar126. This bar 126 is provided with suitable slots 149, 150, 151 and 152, which are so positioned as to cooperate with the pins 77 and 81 carried by the pawls 73 and 7 1. a

1 When the key 115 is depressed, its motion is communicated through thetwo L-shaped or bell-crankdevers, and by means of the pivotal connection indicated at 125, this bar 126 is pulled toward the left which movement separates the dctcnts oi the pawls 73 and 74: and ermits the carria e to move to he movement to t e right may be arrested at any point, and is dependent upon the ion th of time the key 115 is depressed. If epresscd continuously, or that is, for a length of time, the carriage will move to the extreme right hand end, but if depressed for an interval, it will move for a distance corresponding to thattime.

In this shiftin bar 126, there are also slots formed whic are adapted to cooperate with the retaining screws having a head 11 27 he threaded portion 128 is adapted to'cooperate witha'threaded. hole formed in the top 18 of the machine. The relation of the bar 126 to the other operating parts and the screws is shown more particularly in Fi 4, while in Fig. 1 there 18 shown a view 0 the interposed belhcrank lever which co6perates with the keybars.- y

Thus, by means of the key 115, and its cooperating parts, a controlled return of the carriagc're case is provided, and being situated in the bank of keys the carriagamay be returned without liftin the hands. T0

116 in its normal operativg positioma spring 130 is employed.

One end of this spring is secured to a pin 58, gvhile the other end is attached to the keylVhen the pawls 73 and 74 have been dis engaged from contact with the ratchet wheel 72, the pawl 74 in its outward movement contacts with the stop 84 by means of the shoulder 83. The position of this stop and the angle formed by the shoulder is such that the pawl is forced directly against this stop and a further movement is prevented. When the pawl is held in this position against the stop, the universal bar is locked and the movement of the keys may be suppressed during the return of the carria e to the right hand end of the machine. This prevents writing durin the shifting movement of the carriage. When the carriage arrives at the right hand end, the pawls are automatically brought into engagement with the ratchet wheel and the pawl 74 is disengaged from contact with the stop 84, at which time 1 writing may proceed. This is an advanta e because when one is writing near the rig t hand end of the paper, the carria e might be returned in the middle of a wor and if no provision were made. the keys would be striking the platen and the paper during the shifting movement. This would be especially true if notice had not been taken of the alarm signal for the left hand travel of the carriage.

The back spacing mechanism.

The back spacing mechanism is controlled j 134. This pm 134 is mounted in a downwardly bent portion 135 formed in the member 136 forming a part of the bell crank lever. The other member of this bell crank lever is indicated at 137. To provide pivotal action of this bell crank lever a suitable pivot 138 is employed.

In the outer end of the member 137 there is provided means for a pivotal connection indicated at 139 with the actuatin bar 149. Disposed intermediate of the an s of this actuating bar are slots 141 and 142, and ad acent the outer end of the bar there is formed another slot 143. Adjacent the slot 143 there is provided a substantially square hole 144, and the bar 140 is provided with an off-set pro'ection 145. p i

Dispose between the slot 142 and the hole 144 is a detent or pawl 146, which is pivotally mounted on the bar as indicated at 141'. The outer end of the pawl 146 is pro vided with a tooth engaging portion 75, which adapts it to cooperate with the teeth of the ratchet wheel 72. The pawl 74 carries a pin 80 which forms a point of connection for its spring 79. In Fig. 7, the pawl 146 is shown as having wedge-sha ed sides, the widest part being substantial y centrally of the awl.

hen the actuating bar 140 is moved toward the left, the pawls 73 and 74 are separated, and at the same time the detent portion of the pawl 146 is brought into engagement with one of the teeth of the ratchet wheel 72. Just at the time of coming into contact with the ratchet wheel 72, the wheel is rotated backward and is caught by its detent portion 75, When the pawl 146 is released the pawl 73 will then engage with a tooth, and firmly holds it against any further backward movement. This corresponds 'to the width of one letter by permitting the ratchet wheel 72 to move backward one tooth. To maintain the several parts of the back spacing mechanism in a normal osition, a suitable spring 153 is employed. Sue end of thespring 153 is secured to a pin or projection 154, and the otherend is connected" in an suitable manner to the keyb'ar 131.

en it is desired to retract or move the carriage aspace at a time to the right, the key 129 is operated and b means of the connections of the L- or bel crank lever described,

the actuating bar 140 is moved to the left. The pins 77 and 81 carried by the main escapement pawls 73 and 74 project; through the slots 142 and 144, and through the slots 141 and 143 to engage with the stop members having the threaded stems 128. The correla- .tion of the several parts is shown more clearly in Fig. 4. These stops serve to limit the motionof the actuating bar 140 so that the carriage is released only one space at a time when in cooperative action with the pawls 73 and 74, which come into action at the moment of the releasing of the pawl 146.

The shock absorbing mechanism.

Mounted at the right hand side of the frame and upon the side member 16, there is a mechanism to reducethe shock and jar incident to the return of the carriage to such right hand side, the carriage being brought over and returned by means of the spring. The shock absorbing mechanism is mounted so as to retard the carriage during the last portion of its travel. As shown in Fig. 2, this shock absorbing mechanism comprlses a lever havin the members 155 and 156 angular-1y dispfiiced with relation to each other. This lever is pivotally mounted upon a shaft 157, which is carried by a support 158. This support 158 may be secured to the side member 16 of the frameby means of the bolt 159. If desired, this supporting face is provided, which. uponthe return of the carriage will 'enga e the opposite side member may be formed of two parts or in any other approved manner, the means being shown for i lustrative purposes only.

Projecting from the member 155, there is a curved portion 160, which hasencircling. it a spring 161. The free end of this curved member 160 may project through a, suitable slot or opening in the side member 16 of the frame, and as shown in Fig. 2 the spring is interposed between the side member 16 and the member 155' of the lever. The other member 156 of this lever is provided adjacent its upper end with 'a suitable opening to provide for apivotal action of the pawl 162, the pivotal co'nnectionbeing indicated at 163. v

Formed upon the frame near the top, a suitable boss 164 is provided and the member 156 of the lever is so formed that it provides a hammer face which is adapted to; carry felt, rubber, or other suitable noise preventing material .165. As shown, the pawl 162 is provided with two ends which are curved in substantially the same direction. The upper end being free, permits the side member 25 of the carriage to rideover the same to the left hand side of the machine. Upon its opposite side an engaging of the side frame 25. o prevent the pawl frombeing rotated when the carriage is approaching the right hand side, a stop 166 is provided to limit the movement of t e pawl 162 in one direction.

To maintain the pawl in an. operative position, a suitable spring 167 is employed, one end of which is attached to the pawl, as indicated at 168, while the other end is attached to the lever on the member 156, as indicated at 169.

The return of the carriage to the right being eflected with considerable force due to the expenditure of the energy by the spring, the right hand member 25 of the carriage engages with a suitable surface formed on the pawl 162. The pawl being pivotally mounted, as indicated at 163, its opposite end is forced into engagement with the pin 166. The continued movement to the right then causes the'pawl 162 to move the two members 155 and 156 of the lever, tending to compress the spring '161 carried on the curved member 160. The continued movement of the carriage to the ri ht compresses the spring still farther, there y slowing up its action as it reaches the limit of its travel and at the same time the pawl 162 rides under the frame 25 and returns to its normal operating and engaging posltion bymeans of the s ring 167. hus any shock own which woul be occasioned by the carriage coming to a sudden stop by means of the spring action on its return is obviated, and the carriage comes to rest with very little jar simulating the movement by hand although in this instance being automatic.

T he bell signal.

Disposed upon the carriage btween, the end frames 24 and 25, there is a back plate 170, which may be secured to the carriage end frames in any convenient manner. Secured to this plate 170 through an appropriate connection indicated at 171 is a awl 172, the upper end of the pawl being a apted to engage with a stop member 173 to limit its movement in One direction. The lower portion of the pawl extends below the pivot a suliicient distance to engage with a spring element 174. This spring element may be secured to the side frame of the machine 15 as indicated at 175. As shown in Figs. 2 and .3, this spring element projects slightly above the top 18 of the frame, and at some point'intermediate of itsends there is secured a tapper or hammer 175, that is adapted to contact with the bell 17.6. The bell 17 6 may be secured to the machine in any usual or customary manner. one means bem shown By the stud 177. To hold the paw 172 in position for operative enga ement with the spring element 174, a suite le spring 178 is employed, one end of which' is secured to the pawl and the other to a stud indicated at 179.

As the carriage moves toward the left side of the machine, the lower, end of the pawl 172 engages with the spring element 174, forcing it outward until the bending of the element is sufficient to cause it to pass underneath the lowermost end of the pawl 172, when it will fly back with considerable force and cause, a signal to be sounded, showing that the carriage is approaching theend of its travel.

The carriage tension.

The carriage tension mechanism comprises a barrel 32, in which may be mounted a. suitable spring, one end of this spring being connected to the shaft 180, and is adapted to cooperate with the ratchet wheel 181 having an engaging pawl or detent" 182 pivotally mounted as indicated at 183'.

To wind up the spring or to release it, the handles 184 and 185 carried by the ratchet wheel 181 and the pawl 182, respectively, may be employed.

What is claimed is:--.

1. In a device of the class described, a universal bar, a slidably mounted member carrying a tooth, means for moving said member from the bar, a ratchet wheel, a gear wheel rotating therewith, a carriage, means for operating the carriage by the rotation of said gear wheel, a holding awl engaging the ratchet wheel, and resilient means connecting said pawl and slidable member.

wheel. 4

2. In a device of the class described, a universal bar, a ratchet wheel, a member moving at an angle therewith and including a tooth engagin the ratchet -wheel, means for moving said member from the universal bar, a car wheel movable with the ratchet whee, a carriage means for moving the carriage from the wheel uponthe movement of said universal bar, a holding pawl engaging the ratchet wheel, resilient means connecting said pawl with the member operated by the universal bar, and means for releasing said holding pawl and moving said member and the tooth carried thereby out of the path of movement of the ratchet wheel.

3. In a device of the class described, a

carriage, means for positively moving the carriage along a printing line bythe operation of the keys of a typewriter, said means includin a ratchet whee moving with one of said gear wheels, a member carrying a tooth en gaging the ratchet wheel and movable at an angle to the axis of said wheel, means for operatin said member'upon the movementof the eys, a holding pawl engaging the ratchet wheel and means for throwing said holding awi and said tooth first mentioned out.o engagement with 'theratchet 4. In a device of the class described, a

. carriage, means for positively moving the carriage along a printing line by the operation of the keys of a typewriter, said means including a plurality of gear wheels, :1

ratchet wheel moving with one of said gear wheels, a member carryin a tooth engaging the ratchet wheel an movable at an angle with the axis of said wheel, means for operating said member upon the movement of the keys, a holding pawl engaging the ratchet wheel, and means for throwing said holding )awl and said tooth first mentioned out 'o engagement with the ratchet wheel, said means last named including automatically operated and manually operated devices.

5. In a device of the class described, a carriage, means for advancing the carriage along a printing line, and including a a plurality of gear wheels,

- tion a portion of the actuating ratchet wheel, key operated means for operating the ratchet wheel and moving the carriage in one direction, spring controlled means for moving the carriage 1n the opposite direction, a holding pawl, and means automatically operated for disengaging the holding pawl and the actuating means simultaneously, said actuating means and holding pawl moving into engagement with the ratchet wheel from opposite directions, and a spring connecting the pawl and a portion of the holding means.

6. In a device of the class described, a universal bar, a carriage, a ratchet wheel, means operated by said ratchet wheel for positively moving the carriage forwardly along a printing line, means or actuating the ratchet wheel, a plate member having a limited longitudinal movement in the direction of the movement of the carriage, means for actuating said plate member when the carriage reaches a predetermined position, the actuating means including a member slidably mounted and operating at an an le with said plate membeigmeans on the slid-able member engaging the ratchet wheel, and means for throwing out of acmeans by the throwing out of action of sai plate member.

7. In a device of the class described, a

universal bar, a. ratchet wheel, a carriage,

means for advancin the carriage along a.

printing line by t e movement of the movement longitu mally with reference to V the movement of the carria e, and at an angle with said slidable mem er, a holding pawl engaging the ratchet wheel and means or throwlng said holding pawl and engagin means first mentioned out of contact with t eratchet wheel by the operation of said longitudinally movable plate member when the carriage reaches a predetermined position.

In testimony whereof I aifix my signature.

RICHARD M. DAVIS.

Images