US2379843A - Typewriting machine - Google Patents

Description

July 3, 1945- `R. voN REPPERT TYPEWRITING MACHINE Filed April 2o, 194s 4 sheets-sheet 1 July 3, 1945. R. VO-N REPPERT 2,379,843

\ TYPEWRITING MACHINE Filed April 20, 1945 4 Sheets-Sheet 2 v www ATTORNEY July 3 1945- R. VON Rl-:PPERT 2,379,843 TYPEWRITING MACHINE v i Filed April 20, 1943 4 Sheets-Sheet 3 Plas.

INVENT discl 1 mechanism with Patented July 3, 1945 i UNHTED srrss- PATENT- oFFlcl- 2,379,843 TYPEWRITING MACHINE Richard von Reppert, Rochester, N.

Y., assignor to International Business Machines Corporation, New York, .N. Y., a corporation of New Application April 20, 1943, Serial No. 483,749

(Cl. IS7-64.)

14 Claims.

This invention relates to typewriting machines and more specifically to tabulating mechanisms and is a continuation in part of subject matter divided from application Serial No. 448,369 led June 25, 1942, by R. V. Reppert, now Patent No. 2,353,095.

'I'he principal object of the present invention is to provide an improved carriage speed controlling means.

An object is to provide means for reducing the shock usually accompanying the collision beand the counter stop of the vcarriage the governor 1s removed a predetermined time before the column stop collides with the counter stop to'enable the governor to exert a 'greater braking force on the carriage with the object of reducing its speed to a minimum at the timel of collision.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which ose, by way of example, the principle of the invention and the best mode, which. has been contemplated, of applying that principle.

ln the drawings:

Fig. l is a vertical section through Athe machine.

elevation of the tabulating the speed governing device at- Fig. 2 is a front tached.

Fig. 3 is a large scale vertical section line 3-3 in Fig. 2 and showing certain parts in operated position.

Fig. 4 is a detail plan view on a large sca-le showing part; of the lever system for setting the governor.

Fig. 5 is la horizontal sectionvon the line 5-,5 in Fig. 3.

`a-carriage speed gov-v I connected at their Vupper ends tothe denomifv Fig. .6 is a large scale vertical section showing a modification.

The invention is shown in the drawings `as applied to the well-known Electromatic power operated typewriter, also known as the interl For the 'purpose oi illustrating the national. method ofvcontrolling the governor, it has been shown in the drawings as applied to the form of power operated denominational tabulating mechanism disclosed vin Patent No. 2,353,095. It. will be understood, however, that the invention may be applied to other forms of typewriters whether manual or power-operated'and to other formsof tabulating mechanism without substantial departure from the principle. and structure disclosed and claimed herein.

The machine disclosed in the aforesaid patent is provided with a row of denominational tabulator keys In (Fig. 1) and a columnar tabulator key ll. When one` of the keys I0, I is'depressed, one of the key stems Illa moves down-I wardly to rock clockwise one ofthe b'ell cranks l2 pivoted on a cross rod I3. 'Ihese bell cranks v are connected by links I4 tol stop selecting levers l5 (Fig. 2) which are pivoted on a cross rod I6 and cause the vertical links I1 to be coupled to a common operating barvl. The links l1 are I9 and will be thrust upwardly by the bar I8 so as to project the stops Iiiv into the path of a set column stop 20 on the carriage to denne a denominational position of national counter-stops the carriage, as explained in the aforesaid ap plication.

'I'he depression of the keys I0 or Il (Fig. 1) also rocks a universal bar 2l cnunterclockwise thereby depressing a key lever 22 which oontrols a cam unit 23. 'I'his can unit 23 is operated in a well-known way by the power roller `24 which rotates continuously in the direction of the arrow. (Fig. l). 'I he power roller 24 rocks the cam unit 23 in a clockwise direction in a well known way to draw down a link 25 connected to a bell crank 26 which is pivoted on the rod 2".l The downward movementof the link 25 causes the bell crank 26 to rockin a clockwise direction, thereby drawing a' link 28 tothe right. The movement of link 28 rocks clockwise an` operating lever 29 which is pivoted on a plate 30 suit--y ably supported by a fixed'part of the frame work of the machine.

The lower end of the lever 29 engages a stud Bla (Figs. 1 and 2) on the lower end ofen arm 3| secured to an operating shaft 32 journaled in bearing brackets 33 carried by the mainsup' port plate 34 for the tabulating mechanism. As

, a tabulating key,

. tional tabulating keys I0, or tire (column tabulata result, the shaft 32 will be rocked clockwise (Fig. 1) or counterclockwise (Fig. 3), each time such as oneiof the denominaing key I I, is operated.

After the shaft sanas been rckedin the manner just described, it islocked in its operated lision between the said column stop 29 is journaled at its upper Secured to the upper end of the shaft 50 within l mechanism` is automatically the shaft 32 to become aforesaid 4l'teppert application. ,t

is most clearly shown in Fig. 3 which illustrates thecondition a gear 45 nxea to -Weight members 5 2 have short arms position by mechanism described in the aforesaid application: Since this locking mechanism does not directly affect the operation of the carriage speed governing device, herein. It will suffice to say thatwhenthe coland any takes place, thislocking released to permit restored to its normal selected control stop I9 position; This will not ing operation is completed andthe carriage has come' to rest in the desired position as determined bythe selected counter stop I9.

The shaft 32 has actuating connections to the it will not be described occuruntil the tabulatis pivoted at 51 to an ear 58a formed in one of the support'brackets 58 for the cross rod I6. This forkis formed by the bent portions 55a, 56a of member 55 and the arm of lever 56 to which member 55.is fastened.

Interposed between the upper face of pressure plate 54 and the lower end of the hub 53a is a four-prong spring 59 (Fig. 3) and a pair of bearifo above in consequence of cross bar I8 whereby the latter is elevated each time shaft 32 is rocked as aforesaid to raise al selected counter stop I9.

The foregoing briefly summarizes vthe operation of the tabulating mechanism to the extent necessary to an understanding'of the action of the carriage speed governing device. For a more detailed understanding of the operation of the tabu; lating VInecl'iariism, -referencernay lloe had to the The carriage speed governor of theparts after the' governor has been spring loaded to reduce its braking effect during a tabulating operation. The governorincludes a cylindrical housing 38 (Fig. 3) in the form of an inverted cup which may be drawn from sheet metal and ysecured as by welding or brazing to -the underface of a bracket 39 secured to the front face of the plate 34 (see Fig. 2 also). The lower endlof the can 38 is threaded to receive a plug 49 on the top surface of which is secured a friction ring 4I formed of a suitable. friction material.

Also secured to the upper end of the can 38 (Figs. 2 and 3) is a bearing bracket 42 for a short pinion shaft 43 having a pinion 44 meshing with the side of the usual carriage spring motor 46.' This spring motor may be connected in any suitable manner to the carriage as by means of a flexible band 41.` A bevel pinion 48 is secured to the'end of shaft 43 opposite the pinion 44 and meshes with a similar bevel pinion 49 secured to thegovernor shaft 59. The shaft 50 end in the can 38.

the can 38,l is a member 5 I (Fig. 3) formed with supporting at 5Ib the weight members 52. The 52a which upper end of the hub '53a of avbrake disk 53, lthe hub of the brake'disk being journaled in a hole in the plug 40 and also slidable vertically in said hole. The hub 53a is slida'- bly keyed to the shaft 50 by means of a pin 59a carried by shaft 50 .and projecting into a slot in hub 53a whereby thev assembly comprising the engage the enlarged pinion 49, shaft 59, the member 5I, the weight members 52 andthe brake disk 53 are rotatable as normally Abears against the a unit by spring'mo'tor 46. Loose on the lower end'of the shaft 59 (Figs. 2 and 3) rests on the arms of a fork formed by a member is ai circular pressure plate 54, the hub 54a of` which normally chored to the vertical army of the bell crank and 'to a pin 1| carried by an extension -34h or-` the ling washers When the lever 29 is operated as described.'

the depression of a denominational tabulating key I0 or the column tabulating key II, the bell crank 62 will be rocked clockwise (Fig. 4) drawing the link 62 to the left (Fig. 2) to rock the setting lever 56 in a counter-clockwise direction. This causes the pressure plate 54 to be elevated from the position of Fig. 2 to the. position of Fig. 3 placing the prongs of the spring 59 under greater tension since vthe hub 53a of the friction disk 53 is incapable of moving upwardly (Fig.,3) and can only move downwardlya under the stimulus of centrifugal force acting through the weight members 5 2. This has the effect of spring loading the weight members 52 so as to require a greater centrifugal force to push the hub 53a In the position of Fig. 2, the spring' 59 may Vhave little orno effect so that the-weight members 52 are comparatively free' to move in an arc with rotation of the shaft 50 by theospring motor' 46. With the pressure plate in the position of Fig.,3, the 'friction disk 53 will have to be driven at afairly high speed before the weight members 52 move far enough to bring the friction disk 53 in contact with the friction ring 4I. the parts are in the position of Fig. 3, the carriage may acquire considerable' velocity during the rst portion of the tabulating movement of the carriage with relatively slight checking Aeit'ect by the friction disk 53.

Means are provided to lock the presure plate 54 in 'the position of Fig'. 3. and to release the pressure plate shortly strikes the selected counter stop I9. Securedto the front face of the plate 34 (Figs. 2, 3, and 5) is a bracket 64 formed with ears 64a. supporting a long stud 65 on which is loosely pivoted a detent lever formed by securing together a straightarm 66a and an irregularly bent lever` 66h. The lever 66h is formedwith an offset latch lug 66e which ends of thefork formed by the bent portionl 55a ofmember 55 and the portion 56a. of lever 56. The portions 66o snaps as inl Figs..3 and 5, when the pressure plate 54 is lifted by bell crank 56 to the position of Fig: 3, thereby maintaining the governingA` device in spring loaded condition until released by. the means about to be described.

The arm 66a is connected by a link' 6l bell crank 68 pivoted at 69 on the' 2, 3 and 5)to a front -face of the plate 34. The bell crank 68 is urged in a clockwise direction against a stop stud 34a (Fig.l 2) by means cf aspring 'I8 anbefore the column stop 29 tically movable slide 13 held` there by gravity' and by means of a spring f link 12 meshed to the i vertical arm of the bell crank 68. f

' riage to acquirea set column stop 28,

' into engagement producing-braking force which checks the speed `the tape 41. is applied by stop, the lockingdevice Y lapplication will be released to permit the vshaft the lever 29 has a pin and $2,379,843 plate 34. Pivoted on the upper end of the vertical arm of the bell crank 681s a link 12 having an L-shaped offset 12b. The horizontal lug 12b normally rests on the upper end of aver` (see Fig. 3 also) and is 14 which is anchored to The slide 13 is guided at its upper end in a bracket 15 (Figs. 2 and 3) secured to the front face of the plate 34 and at its lower end by another bracket 16 also secured to plate 34, both brackets being provided with closed slots of the same length and width as the thickness and width of the link in cross section at the bearing points in the brackets.

to place the lug 12a in the path of the set column stop 28 which is to determine the final stopping position of the carriage.

course, pressureV plate 56 will be pushed upwardly and latch'ed. by the lug 66e. Thejrnovement of.

the lever 66h to latching position also causes a slight Aclockwise movement of the lever 68 (Fig. 2) to draw the link 12 slightly to the right. The spring loading of the governor allows the v carriage to move very freely throughout the bulk of the tabulating mechanism and allows the carin its travel to the left (Fig-2) will strike the lug 12a and .draw the link 12 to the left in Fig. 2 until-'the lug 12b passes out of contact with the upper end ofthe slide 13 per- :knitting` the spring 14 to rock thelink 12 slightlyV counterclockwise until the lug 12b rests upon the y top surface of the bracket 15 with a lug 12b bearingagainst the left side ofthe slide 13. This movement of the link'12 to the left by the column -stop 28 rocks the bell crank 68 counter- Y. clockwise (Fig. 2) thrusting the link 51 downwardly and rocking thelever 66h clockwise to Arelease the latch lug` 66a from the portions bent f 55a, 56a, of the member 55 and lever 56. This permits the pressure plate 54 to drop and, since at this point the shaft vEll Willbe rotating at high speed, the friction disk 53 will be free to move with the friction ring 4| and of the carriage' through the springdrum'46 and This frictional force, in' actuality, reducing the force exerted on the carriagev by the spring motorfthrough the tape 81', so that thefinal movement of the carriage is produced Alargely bythe momentumstoredin 4 the carriage itsel Slide 13' has a horizontal extension 13a connected by a link 11 to an arm 18 high velocity. Ultimately, the

portion to provide a vertical lug y 12aanda horizontal lug At the Sametime, of

' As soon the the column s'top strikes the counter described in the Reppert 82 to. be restored thereby lowering the slide 13 and permitting the spring 10 to draw the link 12 and lever 68 back to the position of Fig. 2 in readiness I for another tabulating operation.

There vis shown in Fig. 6, a modified form of setting lever and detentmeans for the pressure plate 54 which may be more suitable for use with thespecic formof mechanism described in the Reppert application. In the latter application,

slot connection through pressure plate 54 must be released before the' column stop 20 strikes thecounter stop I9, it is necessary to modify the construction of the setting lever 56.

In Fig. 6, the setting lever. 56 is formed with a goose neck shaped arm on which a pawl 8| is pivoted at 88a. The-pawl is urged in a clockwise direction by a leaf spring 82 lug formed in the arm 80. The ear 58a in this case, is elongated and provided with an offset stop lug 58b engageable with the tail of the pawl 8| on the opposite side thereof to the spring 82. In Fig. 6, the parts are shown in the set position with pressure plate 54', maintaining the tension of the spring 59 at the maximum and is held in this position'by a pawl 83 pivotally mounted on the long stud 65 which also pivots the lever 66h. The pawl 83 is urged counterclockwise against a stop lug-66d formed in the lever 66D by a leaf spring 84 secured to an oliset lug formed in the lever 66h. I'he lower end of shaft 50 is formed with an enlarged portion 50h to provide limited downward movement 'of the pressure plate 54. I n the position ofFig.' 6, with the governor fully spring loaded, the hub of the pressure plate passes down on the end of the pawl 83.

Upon the engagement of the column stop 20 with the lug 12a, the lever 66h is rocked clockwise, as described above in reference to the form shown in Fig. 2, and disengages the pawl 83 from the face of the hub l511|, allowing the pressure plate 54 to drop. With the release of the link 12, the spring 18 will rock the lever 618 clockwise back to the position of Fig. 2., thus causing the lever 66h to rock counterclockwise back to the position of Fig, 6. Since the end of pawl 83 is now released from the latching surface inthe hub 54 and occupies a' position horizontally opposite the cylindrical part of the hub 54, the pawl 83 will not be free to assume the position of Fig. 6 with the result that the spring 84 will be tensioned. A

When the disengagement of the locking means which holds shaft 32` in operated position takes place, bearing in mind that theform of the mechanism disclosed in the Reppert application is now under consideration in which the lever 5E will be held in actuated position, such lever will now be released and wise direction (Fig. 6

yThe release of the pressure plate 54 has resulted in placing the hub of said pressure plate below the nose of .the pawl 8| with the' result that when the lever 56 is restored, said nose will engage said hub and be held in approximately a vertical position by said hub until the lever 56 has moved far enough to enable the nose of the pawl to snap under the hub and engage the enlarged portion 58h.

When another tabulating operation occurs, the lever 56 will .be rocked in a counterclockwise di-- rection and the pawl 8| will lift the pressure plate 54 far enough for the pawl 83 to again snap under the latching surface on the hub. As the lever 56 rocks counterclockwise, the tail of the .pawl 8| will be brought into engagement with the stop lug 56h and gradually the pawl 81| will be rocked in a counterclockwise direction relative shaft 22 and parts con# secured to -an olsetv allowed to rock in a clock- 83 is released. Furthermore, when the pressure plate 54 is pushed upwardly to load the governor, movement need not be transmitted through the linkage including lever 6 6b1ink 61 and lever is` also projectable' into said path 4to intercept the other stop; a normally active governing. device, means to actuate the projectable st'op and render the governing device temporarily at least less effective, and means actuated by the stop which is movable along said path for restoring the effectiveness of said device prior to the interception of the one stop by the other.

3, Infcombination with a tabulating mecha- 68 to the links 12, because the spring 84 mayClO nism havinga carriage moved stop travelling ina be weaker than the spring 10 to allow the pawl 83 to moveinto latching position without distrbing the linkage.

When the carriage is returned, the spring motor 46 is driven by the tape 41 in the reverse direction to wind the power spring. If the pinion 44 were fixed to the shaft 43, the braking device would be driven in the reverse direction 'andexert a load upon the carriage, thereby tending to slow down the return of the carriage. In some cases this might be undesirable and means may be provided7 to preventit from happening;

The pinion 44 is loosely rotat bly mounted on the shaft |43 between the enlarged end 43u, (Fig.

path from one columnar position to another and having a cooperating stop intercepting and engageable by the travelling stopl to determine said second columnar position and also having means to initiate a tabulating operation, a normally fully' effective carriage governor, means controlled by the initiating means.for temporarily rendering the governor ineffective or at least less effective, and means controlled by the initiating means and movable by the carriage moved stop near the end of its path' for restoring the full ei-4 fect of said governor. i

4. In a machine of the class described, in combination with a main carriage, a row of column nism having.' a column stop and a counter stop,v

3) of nie shaft and a. collar 43h attached to the shaft as by means of a pin 43o. Secured to the hub of the pinion 44 is aclutch disk 85'on which is pivoted a friction clutch dog 86 urged in a clockwise direction (Fig. 2) by a spring 81. The dog 86 is formed with a slightly spiral cam 86a vwhich engages the collar 43h.

When the disk 85 is rotated in a. clockwise direction (Fig. 2) the cam 86a firmly grips the col- Alar 43h and drives the shaft 43 in the same direc- /tion. The disk 85 is rotated in a clockwise direcstops for defining differentcolumnar positions determining different denominational positions of the carriage for each column defined by a single' column stop, said counter-stops being arranged in a row parallel with the row of column stops; a carriage cushioning device including an operating member movable intothe path of a device through a predetermined movement of the carriage, said member being disposed in aligntion by the gear when the carriage is letter ment with the row of counter-stops so as -to be Spacing 01 tabulating. whereby the gOVelnOI 0r' engaged and operated by one of said column stops brakingvdevice will be operative. The disk 85 is and then released prior to engagement of a colrotated in a counterclockwise direction during a umn stop with a counter-stop; a series of decax'riage return operation, causing the cam 86a to slip on the surface of the collar 43h, whereby the shaft l43 will not be turned, thus relievingthe carriage of the loadimposed by the governor. The spring 81 may have light tension and the cam 86a'1a relatively slight rise whereby only a small spring pressure is needed to insure a positive drive of the shaft 48 by theA disk 85.

While there have been shown and described and pointed out the fundamental novel features of the invention as applied to a single embodi.

. ment,-it willbe understood that various omissions and substitutions and changes in the form and details of the device illustratedrand in its operation may be made by those skilled in the artmwith-v out departing vfrom the spirit of the invention. It is the intention therefore to be limited only as indicated bythe scope of the following claims.

What is claimedis: I i,

1. In combination with the carriage of a type- Writer, tabulating mechanism including acolumn main carriage, a counter-stopv movable into enstop moved 'by the carriage and a counter stop gagement with the column stop to arrest the carprojectile to a position to be engaged by Said riag by cooperationwiththe column stop; and COlUmn StO'p'tOaIleSt'the carriage in a columnar a retarding device including a. member movable position, `a friction speed governing device for into the path of the counter-stop when the controlling the speed of travel of the carriage counter-stop is moved, said member having a land having loadingmeans to reduce the effect limited travel'under the influence of the column ofthe governing device, means to vproject the counter stop into the path of'the column` stop i and render thel loading means effective, and means actuated by said column sto for rendering the loading means -neiective.,

2. In combination 'th a tabulating mechastops, and means controlled by said keys for simultaneously moving said operating member 4i into the path of'a column stop for movement by said column stop.

5. In a tabulating mechanism, in combination with the main carriage, a column stop on the main carriage, a counter-stop movable into the yice including an element movable with the `counter-stop into the path of the column stop and arranged to be moved by the column stop in its progress toward the counter-.stop and also 55 released automatically from the column stop prior to the engagement of the column stop with the counter-stop.

6. In a tabulatingmechansm, .the combination stop, said member being Qeleasable at a'point to its travel permit the Y'carriage to have an additional move- I ment prior to the column stop striking the counone of'Which stops is moved-in `a path from onea column stop on the carriage, a counter-stop of the main carriage; a row of counter-stops forcolumn stop and movable thereby to actuate said- 40 nominational keys each associated withv a column stop; means controlled by said keys for moving theV counter-stops into the path of the column 50 path of the column stop, a carriage retarding der i with the main carriage, a.column stop on the stop and automatically releasable from the column stop before theA latter strikes the counter- 7. AIn al tabulating mechanism, a main carriage,

columnar` position to another, one'of which stops/.76l movable-into the path 'of the column stop, and.

' released and a carriage retarding device including a movable element arranged to be engageable by the column stop in its movement toward the column stop and to be moved by Ithe counter-stop, and means operable with `the counter-stop for raising said member into the path of the counter-stop and arranged to be disengageable from the member after said member has been moved a predetermined distance, said point of release of said member being located to permit thecolumn stop to move an additional distance prior to the engagement of the column stop with the counter-stop.

8. In a tabulating mechanism, the combination with the main carriage, a column stop moved by the main carriage, a counter-stop movable into the path ofthe column stop, a frictional braking device for controlling the speed of the carriage, means operative when the counter-stop is moved into the path of the column stop to render the braking device ineffective, a member movable into the path of the column stop so as to be engaged and moved thereby to', render the braking device effective a predetermined distance ,from the Icounter-stop, 'member into and means operative to move said the path of the column stop when the counter-stop is moved.

9. In combination with a carriage tabulating mechanism Vhaving a carriage moved stop and a cooperating counter-stop, one of which stops is movable into a position to engage theother to arrest the carriage in a columnar position, a carriage retarding device, means for controlling said device including a normally ineiective member for intercepting thc carriage moved stop in its movement` to said columnar position and automatically disengaged from the carriage moved stop before engagement of said stops to permit the carriage to continue its movement to stopengaging position, and means for moving said one Astop and rendering eiective said member.

10. In a carriage tabulating mechanism, a pair of coacting stops, one of which is movable toward the other to a columnar position; a carriage retarding device, and means for controlling the retarding device including a member movable into the path of the movable stop and so constructed and arranged as to control theretarding device through only a, portion of the path of the movable stop, said member being automatically withdrawn from the path 4of the movable stop before the movable stop strikes the coacting stop. f f

11. In a carriage tabulating'mechanism, a pair of column defining stops one of which has a path of movement intercepted by the other stop to define a columnar position of carriage retarding device, and means for conthe carriage, a

fixed stop.

released automatically before said one stop is intercepted by fthe other stop.

12. In a carriage tabulating mechanism having a relatively fixed stop and a carriage moved stop one of which stops is movable to intercept the other to ldefine a columnar position of the carriage; a friction carriage retarding device including a pressure member and cooperating friction member engageable to produce a friction load on the carriage, and means for controlling the engagement of said members including a member movable to intercept the carriage moved stop"in its movement and movable by the carriage moved stop through a limited portion of the path of said carriage moved stop rto limit the engagement of the friction members to only said portion of said, movement of said carriage moved stop, said movable member being moved by the carriage a predetermined distance and automatically released to permit a further movement of fthe carriage free of said movable member prior to interception 0f the carriage moved ystop by the 13. In a carriage tabulating mechanism havingtwo cooperating stops, one moved by the carriage and intercepted by the other to define a columnar position of the carriage; a `carriage retarding device comprising coacting friction members, centrifugal force actuated means for engaging said friction members, and loading means to counterbalance the centrifugal engaging force; and means controlled by movement of the carriage moved stop for controlling `the loading means.

14. In a carriage tabulating mechanism in which there is provided a pair of coacting carriage arrestingv stops, one actuated into a path containing Ethe other along which path one of the stops' travels until engaged by the other, a carriage retarding device, and means for controlling the operation of the retarding device during a portion of the travel of the ytravelling stop and including a member initially movable into said path along with the actuated stop and thereafter moved a predetermined extent during the travel of the carriage, said member being automatically released and restored rto permit the carriage to continue in its travel a predetermined extent before the engagement of said stops occurs.

RICHARD voN REPPERT.

and movable thereby a

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