US1317482A - Type-writing machine - Google Patents

Description

L. S. BURRIDGE, DECD.

F. 0. surnames, EXECUTOR.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 10. l9l7.

Patented-Sept. 50, 1918.

3 SHEETSSHEET I W ir Affo 6y LEEKQESQM L. S. BURRIDGE, DECD.

F- 0. BURRiDGE. EXECUTOR.

TYPE WRITING MACHiNE.

APPLICATION HLED NOV-10.1917.

1,3 1 7A@2B Patented Sept. 30, 1919.

3 SHEET$-SHEET 2.

MknesSes: i 0 m9 4w @W ZZZQ L. S. BURMDGE, DECD.

r. 0. BURRIDGE. EXECUTOR.

TYPE WRITING MACHINE.

APPLlCATlON FILED NOV. 10. 1917.

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UTED STS '1 TNT LEE S. BURRIDGE, DECEASED LATE OF NEW YORK, N. Y., BY FRANCIS O. BURRIDGE,

. EXECUTOR, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO UNDER- WOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

Original application filed September To all whom it may concern Be it known that LEE S. BUnRmeE, deceased, late a citizen of the United States, and late residing in the borough of Manhattan, county, city, and State of New York, invented certain new and useful Improvements in Type-Writing Machines, of which the following-is a specification.

This invention relates to carriage-controlling mechanism for typewriting machines.

This application is 'adivision of pending app5lication No. 52,594, filed September 27, 191

An object of this invention is to provide a simple and eflicient' escapement mechanism which maybe economically manufactured and easily assembled.

In the type of machine illustrated, the platen carriage is mounted upon a frame which is shiftable up and down to various positions for permitting the printing of different case types. This shiftable frame comprises front and back sheet-metal plates. The escapement wheel is mounted between these front and rear plates. The loose dog and the fixed dog of the escapement mechanism are carried by a rocking plate which is journaled between said front and rear plates. This dog rocker may be made of sheet-metal, and supported upon a sheetmetal bracket secured to one of the transverse plates of the shifting frame. A universal bar locatedbeneath the keys of the machine is provided with a connection to the dog rocker. The dog rocker is provided with a slot, the sides of which are engaged by the connections from the universal bar. This slot is elongated so that the dog rocker will always be under the control of the universal bar in all case-positions of the shift- ,ing frame upon which the dog rocker is mounted.

The dog rocker is'mounted upon a vertical axis for-a horizontal movement, and the shifting frame is -mounted for a substantially vertical movement, and a slot in the dog rocker is vertically disposed so that the leverage between the dog rocker and the connections from the universal bar remain constant, irrespective of thediiferent vertical positions occupied by the do rocker.

The loose dog, in the present invention,

Specification of Letters fatent. Patented Sept. 30, 1919.

27, 1915, Serial No. 52,594. Divided and. this application filed November 10, 1917. Serial No. 201,260.

a position in which it will be engaged by.

the next succeeding tooth when returned to the escapement wheel. For limiting the loose dog in this movement the present in vention provides a spring instead of a fixed stop, as has heretofore been done. With this arrangement when the carriage is moved in anti-letter-feed direction, and the escapement wheel which is connected thereto by the pinion and rack is rotated, the limiting spring will yield and permit the teeth of the escapement wheel to cam said dog to abnormal position to permit the teeth to pass the dog. This obviates the necessity of providing a one-way connection between the escapement wheel and the carriage in order to permit the carriage to be returned or set back.

To aid in assembling the parts and to perso as to be readily removed. For this pur- 7 pose the escapement wheel is mounted on a rod or shaft, bearing in the front, and rear shift frame plates, which may be entirely withdrawn from its supports. drawal of the shaft permits the removal of the escapement wheel. The shaft is posi- This withtively held in the machine against turning and withdrawal by means of an arm, secured to the shaft, which may be held to the frame by means of a screw. The carriage rack is journaled on trunnions, one of which extends into a socket in the carriage frame, and the other of which extends into a socket in a bracket which is removablyheld to the carriage frame by a pair of screws.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a side elevation, showing the shiftable platen frame.

Fig. 2 is a rear el vation, showing part of the springdrum mechanism.

Fig. 3 is a detail 'sectional view of the carriage spring mechanism.

Fig. 4 is a rear sectional view, showing part of the escape' nent mechanism.

Fig. 5 is a sectional elevation, showing the mounting of the escapement wheel.

Fig. 6 is a side elevation, showing the connections from the keys of the machine to the escapement mechanism.

Fig. 7 is a sectional top-plan view, showingjhe parts shown in Fig. 4.

- *ig. 8 is a front elevation, showing the carriage rack and escapement mechanism.

Type-bars 10 are swung upwardly and rearwardly against the front face I of a platen 11 at the depression of keys 12 mounted on key levers 13. The platen 11 is mounted on an axle 14 rotatably mounted in side plates 15 forming part of a type Writer carriage 16; said typewriter carriage also comprising bars 17 serving as rails for ball-bearings 18, upon which the carriage rides in letter-feed and return directions.

The hall-bearings are confined between the rails 17 and forward and rearward plates 19 and 20 which form part of a frame 21. The frame 21, which also,comprises side plates 22, is suitably guided and shiftable substantially vertically, for the purpose of moving the platen to various case-printing positions.

The typewriter carriage normally tends to move in letter-feed direction under the influence of a spring 23 connected by a cord or tape 24 to the carriage 16.

The letter-feed movement of the type writer carriage is controlled by an escape ment mechanism, which comprises an escape: ment wheel 25 and also a pinion 26 engaging a rack 27 carried by the typcwrlter carriage.

- The escapement'wheel 25, formed with a hub 28 to which the pinion. 26 is secured, is

mounted to rotate on a pin 29 which passes.

through the-hub 28, and which is mounted in the forward: and rearward plates 19 and 20. The pin 29 is, mounted atone end in a bushing 30 secured to the front plate 19, which is of sheet-metal, and at its other end in a bushing 31 secured to the rear plate 20, which is also'of sheet-metal. The bushi 31 extends from the rear plate 20 iforwar and, acts as a spacer for holdihg the es capement wheel against lateral movement on the pin 29; the escapement wheel being confined between the-bushing 31 and the bush-.

ing 30. So that the parts may be conveniently assembled and removed from the machine, the pin 29 is removably held in the machine by a plate 32 riveted to one end of the pin 29. The plate 32 is secured to the rear plate 20 by means of a screw 33.

The escapement wheel 25 is normally prevented from rotating under the influence of the carriage spring 23, by an escapement dog 34 which engages with one of the teeth 35 of the escapement wheel. The dog 34- is pivotally mounted at 36 upon a plate 37, and is limited in its movement in one direction by means of a stop-pin 38 secured to the plate 37. The carriage spring 23 through the rack 27 and the pinion 26 normally tends to rotate the escapement wheel, and, therefore, the escapement dog 34 1s normally held against the stop-pin 38. The

plate '37, which is preferably stamped from sheet-metal, is mounted for a horizontal rocking movement on trunnions 39 riveted to cars 40, formed. integral with the Plate 37, and having headedends extending through ears 41 on a bracket 42 secured to the rear plate 20.

When the rocker plate 37 is moved by mechanism hereinafter described, the loose dog 34 is moved out of engagement with the tooth 35 on the escapement wheel, and a fixed dog 43 formed integral withthe plate 37 is moved into engagement: with the escapement wheel, to hold the same temporarily against movements Thus freed from the escapement wheel the loose dog 34 is movedup by a draw-spring 44,.connected to an arm 45 extending from said dog, into the position shown in Fig. 4, in dot-anddash lines. In this position the dog 34 is located opposite the next tooth on the escapement wheel, so that when the rocker plate is returned to normal position by its spring 46, (see Figs. 6 and 7), and the fixed dog 43 is moved out of engagement with the esoapement wheel, the loose dog will be moved intgposition to engage the said next tooth on the escapement wheel.-

out of reach of,the escapement wheel, by a the carriage to also be fixed stop, but in the present invention said dog is limited by a draw-spring 47. This spring47, with the spring 42, normally tend to move the dog to the dot-anddash line position, shown in Fig. 4, and no farther. The omission of \the customary stop is advantageous 'in that the noise accompanying the operation of the machine is reduced. Spring 47 returns the dog to the midway (dot and-dashyposition after said dog has been vibrated upwardly beyond the dot-anddash position by the' reversely moving escapement wheel 'asthe carriage is drawn back. Springs 44 and 47 diverge from the s rin 47 b Y the escapement wheel to an abnormal position, until the teeth of the es capement wheel may pass the dog. If the loose dog 34 was limited in. its upward movement, to its position to engage the next tooth of the escapement wheel, after said Wheel is released by the fixed dog, then said fixed stop would operate to prevent the backward rotation of the escapement wheel, and therefore theanti-letter-feed of the platen.

The present invention, therefore, simplifies and reduces the cost of the device by obviating the necessity of providing a one-way connection between the escapement wheel and the carriage, which has heretofore been the practice, in order to permit the carriage to be moved .in anti-letter-feed direction.

The mechanism for operating the rocker plate 37 from the keyboard of the machine to cause the letter-feed movements of the carriage will now be described.

A universal bar 49, extending across the machine and located directly beneath the key levers 13, is pivoted at its, rear end in brackets 50 which, in turn, are secured to a transverse bar 51 of the. main, frame. Each of-thetkey levers 13 has a shoulder 52, adapted, when the key lever is depressed-to strike and depress the universal bar. The

universal bar is connected to rock the dog plate 37 by means of a rock shaft 53, Which has arms 55'connected by links 56 to the universal bar 49. The rock shaft 53 is journailed in brackets 54 which are secured to the bar 51: A link 56 in an arm 55 is provided for each side of the universal bar. The rock shaft 53, the arms 55 and the links 56 connect the opposite sides of the universal bar, and therefore cause said universal bar to descend uniformly whether operated by a key at one side of the machine or the other. The rock shaft 53 has an arm 57 secured thereto, which at its upper end is connected to a draw bar or link 58. The draw bar'-58 is connected at its forward position to the arm 57 by a pin 59 secured ;to the draw bar, and at its rearward portion to a supporting lever 60. Secured to the rearward portion of the draw bar 58, which is preferably of sheet-metal, is a threaded post or pin 61. which extends through an opening 62 in the end 63 ofthe rocker plate 37, and "has a head or nut 64 thereon which engages with the sides of the opening 62. The nut 64 is adjustably"*he1d The connection 61, 64 is universal against lDOVGll'lBlli] on the threaded pin 61 by means of a lock nut 65.

The opening 62 is elongated so that the rocker may rise with the shift frame to the various case-positions, without permitting the pin 61 and nut 64 of the draw bar to become disengaged from the dog rocker; therefore, the universal bar may operate the dog rocker in all case-positions of the shift frame. The slot 62 is arranged to substan tially parallel the axis about which the dog rocker pivots. In the present case the dog rocker axis is vertically disposed, and, therefore, the slot 62 is vertically disposed. This arrangement permits the shifting of the dog rocker with respect to the draw bar without varying the leverage or altering the amount of movement which the dog rocker will re ceive from the universal bar. The portion 63 of the dog rocker is tilted slightly, so as to parallel the'path of movement of the shiftframe to further aid in maintaining the connections between the universal bar and the dog rocker constant. The. slot 62 has an open end 62 so as to permit the device to be easily assembled. Said axis of the dog-rocker pivot extends about in the direction of case-shifting movement of the platen, whereby the key connection is able to have the same control of the rocker in all case-shift positions.

Vhen a key lever 13 is depressed by its key 12, theslioulder 52 on said key lever operates the universal bar 49. and in doing so, rocks the shaft 53 through the links 56 and the arms 55, to move 'the draw bar-'58 forwardly so that said draw bar 58 will rock the dog plate 37 to move the loose dog 34 out of engagement with the escapement wheel. As the key rises under the influence of its spring 66, the dog rocker 37 through its spring 46, returns the draw bar 58 and the lever 60, on which it is iioatedly mounted, to normal position; at the same time as the loose dog 34 is being moved into codraw bar and the lever, on which the draw bar is mounted, are limited in this return movement by a stop 67 (see Fig. 7), formed on on arm 68 secured to the rear plate 20 keys. In order that the rock shaft 53, which is operated by the universal bar, may perform other functions before the escapement mechanism is operated. and in order that the escapement mechanism may be operated only at the end of the keystroke, the draw bar 58 is slotted at 6-9, so that the pin 59 in the arm 57 may have a limited lost-motion beat the other ,end to the arm' 57, holds said arm and thereforethe universal bar 49 in jfore operating said draw bar. A spring 70, secured at one end to the draw bar ,58 and normal position. The spring 70 is weaker than the spring 4-6, which holds the dog rocker 37 and the draw bar 58 in normal position. Therefore, in the first part of the movement of the arm 57, as the key is depressed, the spring 7 0 yields and the draw bar is not moved until the pin 59 on said arm 57 reaches the end of the slot69 in the draw bar. 4

So that the universal bar will cause the feed of the platen in all case-positions of the latter, the opening 62 in the dog rocker 37,

through which the draw bar 58 passes, is elongated so that the draw bar, which is mounted in the main frame, will always remain in operative engagement with the dog rocker 37, which is mounted in the main frame 21, which, in turn, has a substantially vertical. shifting movement relative to the main frame.

A space-key '71 is carried. by a lever 79. fast on a rock shaft 73 to which is also fastened an arm 74; which is connected by a link 7 5 to operate the lever 60, on which the draw bar .58 is floa tedly mounted. The space-key and associated parts are held in normal position by a spring 75 connected to the arm 7% and at the other end tothe frame of the machine. When the space-key 71 is depressed, the arm 74 and the link 75 are moved forward. This moves the draw bar forward, so that the nut -64, carried by said draw bar, engages with the portion 63 of the dog rocker and operates the esca'pement mechanism. 550 thatthe space-key which is connected to the draw bar will not be operated when the draw bar is operated through the universal bar 49, the

lever 60 is slotted at Ti .1 This slot permits the lever 60b!) be moved forward without when the operator desiresto move the typeoperating the link 7 5, but permits the link 75, when moved forward, to operate the lever."

lhe carriage rack 2? is pivotally mounted on the typewriter carriage, and has secured thereto a handle or linger-piece 79, so that writer carriage in letter-teeddirection without interference from the esceqiement mechanism, the carriage rack may bereleased from the escapement wheel by operating said finger-piece to move the rack 27 out of engagement with the pinion 26 secured to the escapement wheel. Thefingenpiece '(9 is located in a place Where it is convenient to the operator. The rack 27 is limited in its swinging movement in one direction by means of a stop riveted to the rear carriage rail l In order to facilitate. the assembling and:

extends into a hole 8% in a bracket secured to the other side plate 15 by screws 86.

With this arrangement the rack may be attached to the carriage after the side plates 15 and the rails 17 have been riveted together. In attaching the device the trunnion 81 is first slipped in the opening 82, then the bracket 85 is slipped on the trunnion 83, and then the bracket 85' is secured. 1

to the side plate 15 by the screws 86. If it is desired at'any time to remove the rack 27 "for the purposeof repair, or for substituting a rack of different pitch, the screws Bliare withdrawn, after which-the rack may be readily slipped out of its bearing in the side plate 1.). It will be sure that the escapement wheel 25 and the pinion 26 may also be readily removed from the machine for. the purpose of maklngrepairs or substituting a pinion and esrapement wheel of dif ferent pitch. To remove the escape ment wheel and pinion, it is only necessary to withdraw the screw 33 and then pull the in 29 with its plate 32 out of its supports. T is would permit the escapmnent wheel to be slipped out of its position in the frame.

Theremovable rack and removable es capement wheel and pinion make it extremely convenlent to change the ,maclnne' from'e one size letterspacing to another; and it will be seen that thi chan e may be accomplished without dis-assem ling the machine to any great extent.

Variations may be resorted to within the scope of the invention, and portions of the 1m .aving thus described the invention, What is claimed is: i

1. In a typewriting machine, the combination with a platen, of means for driving the capement mechanism for controlling the driving of the platen comprising a toothed wheel a pair of dogs for holding said wheel, a rocker plate for jsupportin said dogs, means for vibrating sald roe or plate to rovements may be used without others.

platen in letter-feed direction, and an esmove said dogs into and out of the plane of the wheel, and two draw-springs attached to an arm provided upon one of said dogs,

one for rocking, the dog toward a succeeding tooth on the wheel, when it has been disengaged from one tooth of the wheel by movement of the rocker-plate, and the other spring for returning the dog after it has.

been dis laced by the reverse rotation of the whee said springs diverging from said dog arm inn manner that the operation of said'dog may render either spring efi'ective and the other simultaneously in'efiective.

2. In a typewriting machine, the combination with a platen, of a carriage for said platen, a frame for said carriage comprising I front and rear sheet-metal plates, an escapement wheel mounted between said front and rear plates, and a rod on which said escape said rocker extending about in the direction of the case-shifting movement of the platen.

ment Wheel is mounted, said rod being mounted in bosses secured to said plates.

3. In a typewriting machine, the combination with a platen, of a carriage for said platen, a frame for said carriage comprising front and rear sheet-metal plates, an escapementwheel mounted between said front and rear plates, and a rod on which said escapement wheel is mounted, said rod being removably mounted in bosses secured to said plates, said rod being held in po sition in the plates by an arm to which it is secured, and said arm being removably secured to one of said plates.

4. In a typewriting machine, a main frame, a platen frame shiftabl'e between case-positions on the main frame, a platen mounted for letter-feed movement on the platen frame, means for driving the platen in letter-feed direction, an escapement mechanism in the platen frame for controlling the letter-feed drive of the platen, type keys on the mainframe, and a universal connection from said keys to the escapement mechanism for operating the latter; said escapement mechanism comprising a toothed wheel, a dog adapted to be rocked into and out of engagement with said wheel, and a carrier for said dog having therein a slot through which the carrier is engaged'and rocked by the connection from the type keys, said slot permitting shift of the carrier with the platen frame without shift of the typekey connection.

5. In a typewriting machine, a main frame, a platen frame shiftable between casepositions on the main frame, a. platen mounted for lettei-feed movement on the platen.

frame, means for drivihg the platen in letter-feed direction, an escapement mechanism on the platen frame for controlling the letter-feed drive of the platen, type keys on the main frame, and connections from said keys to the escapement mechanism for operating the latter; said escapement mechanism comprising a slotted rocker with which the type-key connection is in slidable engagement, so that the rocker 1 may be shifted with the platen without shift of said key connection, the axis of rocking movement of 6. In a typewriting machine, a main frame, a platen frame shiftable between case-positions on the main frame, a platen mounted for letter-feed mzn ement on the platen frame, means for dIlVlIlgWht-i platen in letter-feed direction, an escapement mechanism on the platen frame for controlling the letter-feed drive of the platen, a spacekey on the main frame, and connections from said key to the escapement mechanism for operating the latter; said escapcment mechanism comprising a toothed wheel, a dog adapted to be rocked into and out of engagement with said wheel, and a carrier for said dog having therein a slot through which the carrier is engaged and rocked by the connection from the space-key, said slot permitting shift of the carrier with the platen frame without shift of the key connection.

7. In a typewriting machine, a main frame, a platen frame shiftable between case-positions on the main frame, a platen mounted for letter-feed movement on the platen frame, means on the platen frame ftir driving the platen in letter-feed direction, type keys, and mechanism actuated thereby for controlling the letter-feed drive of the platen, said key-actuated mechanism comprising a universal bar on the main frame,

an arm connected to the bar to be rockedthereby, a link vibrated by said arm, and a rocker on the platen frame vibrated by said link, said rocker having a vertical slot engaged by said link to accommodate the I case-shift movements of the rocker, and the axis of rocking movement of the latter extending about in the direction of the caseshift movement.

8. In a typewriting machine, a main frame, a platen frame shiftablu between case-positions on the main frame, a platen mounted for letter-feed movement on the platen frame, means on the platen frame for for controlling the letter-feed drivejof the platen, said key-actuated mechanism comprising a universal bar on the main frame, a rod on the main frame extending forward and rearward thereon, a connection from the universal bar to the rod for reciprocating the same, and a rocker on the platen frame having a vertical slot engaged by the rod, to enable the rod to actuate the rocker at all case-shift positions of the rocker.

9. In a typewriting machine, a main frame, a platen frame shiftable between case-positions on the main frame, a platen, means for driving the platen in letter-feed direction on the platen frame, and an escapement for controlling the drive of the platen, comprising a toothed wheel, a dog;

for driving the platen in letter-feed direction on the platen frame, and an escapement for controlling the drum of the platen, comprising a toothed wheel, .a dog-carrying rocker shiftable with said platen frame, and

an actuator for the rocker in engagement therewith, said rocker having a vertical slot engaging said actuator to permit shift of the platen frame With respect to the actuator, and the axis of rocking movement of the rocker extending about in the direction of its case-shift movement; said rocker having the part thereof engaged by the actuator inclined in the direction of shift of the platen frame, so that the movement of the rocker and actuator may be the same in all casepositions of the platen frame.

11. In a typewriting machine, a main frame, a platen ;-frame shiftable between case positions on'the main frame, a platen mounted for letter-feed movement on the platen frame, an escapement on the platen frame for controlling the letter-feed movement of the platen, type keys, a universal bar, a spaoe-koy,a connection for operating the escapement from the universal bar, a connection for operating the esoapement from the space-key independently of the operation of the universal bar, and means for shifting the platen frame Without breaking said escapen'xent-opera-ting connections.

112. In a ty'pewriting machine, the combination with a platen, of a carriage therefor, a main frame, a carriage-supportingv frame shiftable vertically on the main frame to various case-positions, means for moving the carriage in letter-feed direction, an es- (capement Wheel mounted in the carriage supporting frame, dogs for holding said escapement Wheel, a rocker on which said dogs are mounted, said rocker mounted on said carriage-supporting frame, keys mounted in said main frame, a universalbar operated aeraeea by said keys also mounted in said main frame, and eonneotions between said uni- 40 versal 'bar and said dog rocker, said dog rocker being mounted about a vertical axis for horizontal movement and having a slot on one end through Which the connections from the universal bar pass, sa d slot being vertically disposed, whereby the dog rocker is controlled by the universal bar in all casepositions of the shift frame.

13. In a typewriting machine, a main frame, a platen frame shiftable between casepositions on the main frame, a platen mounted for letter-feed movement on the platen frame, means on the platen frame for driving the platen in letter-feed direction, type keys, and mechanism actuated thereby for controlling the letter-feed drive of the FRANCIS O. BURRIDGE, Eaaecuzfor of the last will and testament of Lee S. Bzmedgc, deceased.

Witnesses FRANCIS G. SMYTH, Jn, F. GARLAND TUCKER.

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