US3752289A

US3752289A - Typewriter escapement and control devices therefor

Info

Publication number: US3752289A
Application number: US00076730A
Authority: US
Inventors: M Link
Original assignee: Triumph Werke Nuernberg AG
Current assignee: TA Triumph Adler AG
Priority date: 1969-12-31
Filing date: 1970-09-30
Publication date: 1973-08-14
Anticipated expiration: 1990-08-14
Also published as: DE1965752B2; NL149436B; DE1965752A1; NL7005228A

Abstract

In connection with an escapement which comprises a flying dog which for causing each escapement step of the carriage reaches out counter to the letter feed direction, there is provided a device which incidental to carriage return motion is operated by friction drag influence to block first said dog against outreaching movement and then to disengage said dog, the device being effective by a short advance movement of the carriage following the return movement to reapply the dog. The device is also operated by the tabulation control mechanism for durations of tabulating runs but not resultant to friction drag influence.

Description

1451 Aug. 14, 1973 United States Patent 1191 Link llllll TYPEWRITER ESCAPEMENT AND CONTROL DEVICES THEREFOR 197/94 197/82 197/84 R Schrader et W 8 b n r e u N k .m y w m mm ae MG 0 t n e v n l n 7 um t. 6 w I K [73] Assignee: Triumph Werke Nuernber A.G.,

Nuernberg, Germany Primary Examiner-Emest T. Wright, Jr. Attorney-Joseph R. Spalla 0 7 9 1 0 30 t. n m 6 7 o N 0. m n. P A 21 22 [57] ABSTRACT In connection with an escapement which com flying dog which for causing each esca [30] Foreign Application Priority Data Dec. 31, 1969 Gen'nany...................

prises a pement step of the carriage reaches out counter to the letter feed di- 94 9 17 being effective by a short advance movement of the carriage following the return movement to rea pply the tion cong runs but not 56] References Cited dog. The device is also operated by the tabula UNITED STATES PATENTS trol mechanism for durations of tabulatin resultant to friction drag influence.

12 Claims, 5 Drawing Figures 24 28 NN $N 77 77 99/99 llq ll Walton...........z..t........

Wunderlich e z .1 e W h C S 9699 66 3 9999 11111 64225 69528 ,ololl. 2 256 44395 3 ,22 33 2 Patented Aug. 14, 1973 3,752,289

2 Sheets-Sheet 2 INVENTOR 4 MANFRED LINK ATTORNEY TYPEWRITER ESCAPEMENT AND CONTROL DEVICES THEREFOR This invention relates to an escapement device embodying at least one pivotally displaceable escapement dog which normally is in engagement with a toothed escapement rack on a typewriter carriage. Said escape ment dog is mounted to have some capacity for spring urged movement counter to the advance direction of the carriage, so that when it is transitorily pivotally moved free of the engaged rack tooth, through opera tion of a type key, it will then spring-move counter to the advance direction of the carriage and into a position to intercept the carriage by a next tooth on the said escapement rack as the carriage advances.

Escapements of this kind, of course, must function reliably at high typing speeds. In turn, high typing speeds necessitate a forceful carriage advance spring in order to accelerate the large-mass-carriage quickly. Under these circumstances, the escapement can not be considered purely in regard to its escapement function, but attention must be given also to other functions which have relation to the escapement, so that such other functions in conformance with high typing speeds will also be performed reliably. Furthermore, it is paramount to insure such control by the escapement over the carriage so that even though the machine may be incorrectly operated, as when two type bars collide, the escapement will not loose control over the carriage.

For functionally effecting quiet carriage movements such as return movements, manual carriage movements, back spacing and tabulations, the escapement must also be appropriately controlled. In connection with carriage tabulations, as also for returns, the carriage ultimately must settle at an exact position in reference to the printing point, that is the normally effective escapement dog must be prevented from moving a tooth space counter to the advance direction away from its normal carriage holding position.

It is well known to increase the typing speed capability of a typewriter through an increased power carriage spring and to mount the escapement rack in a shockreducing manner, thereby to reduce the stresses and loads to which the involved parts are subjected.

In a well-known escapement, see German Pat. No. 1,073,007, or U.S. Pat. No. 2,741,355, shock reduction is achieved by mounting an es-capement rack by elongate holes on pins of a carriage for movement parallel to the carriage and such rack is spring loaded to cooperate with a dog which is spring biased to pivot and can slide parallel to the carriage in reference to an operating lever which operating lever also can pivot and slide, the sum of the stated relative motions of the rack and the dog parallel to the carriage being together smaller than the letter-feed pitch.

In distinction to the prior devices, the attainment of an advantage is sought whereby the dog gets into its operative position before the carriage reaches its next printing position. The aforesaid spring loaded slidably mounted escapement rack however is complex and involves a relatively large mass. Furthermore, since the escapement rack is mounted on studs, the total aggregative tolerances within the entire escapement device are great and obviously give rise to great disadvantages.

Another carriage escaping device, see the German Pat. No. 1,034,661 or U.S. Pat. No. 2,818,958 involves an escapement dog normally engaging a rack, and the typing speed is also stated to have been increased. Ac-

cording to this construction, however, an interposer lever is pushed back into its rest position by a latch pawl toward the end of the escapement step, causing the next escapement trip release to depend on this time cycle. However, in order to achieve the fastest possible escapement performance at the carriage, it is essential to release the rack at the earliest possible moment because the inertia of the large mass of the carriage takes time to be overcome.

One of the objects of the invention is to develop a carriage escapement which accommodates high speed operation and which, in addition, to controlling the carriage for stepwise advance, has also provision for carrying out other functions, for example, quit carriage movements, namely, carriage returns, tabulations and also movements facilitated by a carriage release. It is also an object to accomplish this without adding parts to the escapement mechanism. The escapement furthermore satisfies a condition so that during tabulating and back spacing, the escapement dog is prevented from moving in return direction and so that at the end of such operations, the escapement will take correct control over the carriage in respect to the printing point.

According to the invention an escapement tripping dog and a disengaging lever therefor have each a slot for mounting them pivotally and slidably displaceable on a bracket-supported stud, and a multi-armed lever is pivotally operable on said stud to first block the dog against sliding movement in carriage return direction, and then effect its pivotal displacement while the dog is held blocked, the multi-armed lever and the dog having several interengageable surfaces for the stated purposes.

In order to achieve the above without adding parts to the actual escapement, and to provide for additional, escapement related functions, the multi-armed lever has a link connected thereto by a one-way active pinand slot association for causing tabulating movements. Additionally, the multi-armed lever has a stud projecting from it into the operating range of a carriagecarried release bail. Still further, the multi-armed lever includes thereon a finger and a leaf spring wherebetween a carriage supported flat steel band is situated in frictional contact therebetween. Also the multi-armed lever has a lug which by clockwise movement of the controller will pivotally release the escapement dog after first blocking it against outreaching movement in carriage return direction.

An exemplary'embodiment of the invention is illustrated in the drawing, wherein,

FIG. 1 is a front perspective view showing a carriage escapement dog and controlling devices therefor in segregated aspect,

FIG. 2 is a front elevation of the escapement dog and controlling devices therefor in normal condition,

FIG. 3 is similar to FIG. 2 but the escapement dog is shown pivotally actuated and ready to be spring moved to a rightwardly outreaching position,

FIG. 4 is similar to FIG. 3 but the dog has moved to a righwardly outreaching position on its way to a new tooth relation with an escapement rack, and

FIG. 5 is a front view showing an escapement dog control operated to release the dog and block it against movement to outreaching position.

Referring generally to the figures in the drawing, there is shown, diagrammatically, a portion of a suitably conventional general framework 51 of a typewriter having a mounting bracket 1 fastened thereto by screws 2a at the elongate holes 2 of said bracket 1. As seen in FIGS. 1 and 2 said bracket 1 includes a hole 3, and spaced leftwardly from it a hook formation 4. A stud 5 projects rigidly from said hole 3 forwardly thereof and has a parts-retaining ring 7 seated in a groove 6 thereof. The stud 5 carries a dog tripping lever 8 by a slot 9 in the latter. Such dog tripping lever 8 has a downwardly reaching arm 10 having a notch 11, and further has a ledge 12 bent forwardly from it and including a rearwardly reaching stop finger 13 engageable with said hook formation 4. An operating lever 14 for the escapement dog tripping lever 8 underlies the ledge 12 of the latter and is suitably pivotally operable in response to the operation of any type key mechanism 52 or a space bar mechanism 54 which are diagrammatically shown as including a linkage connected to the operating lever 14 to pivotally operate said dog tripping lever 8. The bracket 1 carries eccentrically adjustable thereon a stud 15. The stud 15 is eccentrically positioned on a cylindrical member 68 disposed in a circular opening or recess 70 in the bracket 1 and rotatable therein to change the position of the stud 15 relative to the bracket 1. A contractile spring 17 is hooked at one end to said stud 15 and at the other end to the notch 11 of the dog tripping lever 8 so that the latter will normally reside with its stop finger 13 resting downwardly against the bracket 1, as in FIG. 2. The dog 18 is mounted on the stud 5 through the medium of its slot 19, so that it can rotate and also slide on said stud 5. The dog 18 includes at its right end an escapement tooth 20 and also includes close to its left end a downwardiy reaching tongue 21 with a rest surface 23 flanking the tongue 21. Rightwardly, of the tongue 21 is a step formation 22 flanked by an upward recess forming an edge 24. A downreaching arm 25 of the escapement dog 18 has a hole 26 whereinto a contractile spring 27 is hooked to bias it counterclockwise. A lever 28 associated with the escapement dog 18 is carried by the stud 5 which is received in a hole 28a formed in the lever 28, so that, in distinction to the dog tripping lever 8 and the dog 18, it is capable only of pivotal movement thereon. The lever 28 has at its right end a stud 30 and above the pivot stud 5, it has an upreaching arm or finger 31. A leaf spring 32 is riveted to the lever 28 and is with tension bearing toward it. The lever 28 embodies furthermore a leftwardly reaching arm ending in a curved edge 34 and has also an ear 33. Also the lever 28 has

bendable stop fingers

35 and 36 for opposite cooperation with the bracket supported stud 15, thereby to define a range of pivotal movement mechanism such lever 28. The machine includes a conventional tabulating mechansim which is shown diagrammatically at 56 and includes a link 39 having accommodation in a slot 38 of the lever 28. The tabulating mechanism 56 is conventionally operable for the duration of its actuation to draw the link 39 down and thereby pivotally move and hold the lever 28 clockwise, as in FIG. 5.

A pin 40 on the bracket 1 carries pivotally a lever 41 and a bent branch 42 of such lever 41 rests normally against the lower edge of bracket 1 under the tension of the aforementioned contractile spring 27 which has its other end hooked to the lever 41 at a hole 43. The lever 41 has above the pivot pin 40 a round ended arm 44 which by reason of the spring 27 always cushions the disengaging motion of the escapement dog 18.

A typewriter carriage 58 shown, diagrammatically in FIG. 1, includes movable therewith a rack 45 which has teetch 46 with which said escapement dog 18 is normally engaged. Furthermore, there is mounted on the carriage 58, extending parallel thereto, an escapement dog release bail 48 which is capable of displacement transversely of its length on the carriage 58, by means of diagonal slots 49 therein in cooperation with studs 50 on the carriage 58, transverse displacement being effected by endwise movement of said dog release bail 48 release through a carriage release lever 62, diagrammatically illustrated in FIG. 1, provided at the end of the carriage 58, and which is operable to press downwardly against the escapement dog release bail 48 to effect a diagonal movement downwardly as guided by the studs 50 received in the diagonal slots 49.

Each time a type key mechanism 52 or a space bar mechanism 54 of the typewriter is operated, the lever 14 becomes transitorily operated, and by contact with the ledge 12 operates the dog tripping lever 8 clockwise to the position seen in FIG. 3. In doing so, the right endportion of the ledge 12 on the dog tripping lever 8 acts on the overlying surface 23 of the escapement dog 18 to rotate the latter clockwise on the stud 5, causing the dog tooth 20 to move clear of a tooth 46 on the rack 45 which has engaged it, see FIG. 3. Meanwhile, the lever 28 remains in its normal position see FIGS. 1 and 2, wherein its finger 35 rests counter-clockwise against the eccentrically adjustable stud 15. When the dog tripping lever 8, against the influence of the spring 17, has rotated the dog 18 for its tooth 20 to leave the rack 45, the spring 27 becomes effective to move the dog 18 bodily, as allowed by the slot 19 therein in the direction of the arrow B, see FIG. 4. In being so moved the dog tooth 20 has moved rightwardly of the rack tooth 46 from which it has been disengaged and the rack 45 meanwhile has remained stationary due to the static inertia of the carriage 58. During a substantial part of the rightward movement of the dog 18 toward the FIG. 4 position, the dog tripping lever 8 has its ledge 12 underlying the surface 23 on the dog 18 and bearing rightwardly against the tongue 21 under the tension of the spring 17. Because the dog tripping lever 8 is under the urge of the spring 17, it will follow the movement of the dog 18 rightwardly from the FIG. 3 position toward the FIG. 4 position. However, as the dog 18 near such FIG. 4 position, the dog tripping lever 8 becomes intercepted by contact of the right end of the ledge 12 with the edge 24 on the lever 28, so that the dog surface 23 then moves rightwardly clear of the ledge 12 and the dog 18 under the influence of the spring 27 will then snap freely counterclockwise to engage its tooth 20 with the next rack tooth 46. These motions are taking place very rapidly and as the static energy of the carriage 58 is then overcome by a carriage feed spring, as is convention and shown diagrammatically at 60 in FIG. 1, the carriage 58, see Arrow A in FIG. 2, moves the dog 18 on the stud 5 in letter feed direction to the limit of the right end of the slot 19 in the dog 18. During this motion the dog tripping lever 8 is moved by the left end of the dog 18 leftwardly so that the ledge 12 moves leftwardly beyond the edge 34 on the lever 28. Finally, the positions of the parts are then normal again as shown in FIG. 2.

The lever 28 has normally a position in which a stop finger 35 therein bears counterclockwise against the frame supported stud 15, see FIG. 1. In FIG. 2, a portion of said lever 28 is shown in normal position and it will be seen that an ear 33 thereon is normally disposed slightly below the step formation 22 of the dog 18 and is spaced slightly rightwardly from the edge 24.

For the duration of the carriage tabulations and carriage returns, lever 28 takes up the clockwise operated position shown in FIG. 5. In taking up this positon, the ear 33 on the lever 28 first moves upwardly to be disposed rightwardly of the edge 24 on the dog 18 so that the latter is then blocked against significant rightward movement by the spring 27. Further pivotal movement of the lever 28 swings the dog 18 clockwise free of the rack 45, but the ear 33 allows only a minimal rightward movement of the dog 18. Thus, a condition is established at the outset of the carriage returns and tabulations to free the carriage 58 for movement, but to hold the dog 18 substantially in unextended position so that the right end of the slot 19 therein is situated closely to the stud 5. At the end of the carriage return or tabulating runs, a usual margin stop 64 or tabulating stop 66 is engaged and due to a usual short carriage overrun and return movement which then takes place, the lever 28 will become frictionally dragged counter clockwise to its normal position seen in FIG. 2 by operation of the upreaching finger 31 and the leaf spring 32 as explained below Consequently, the escapement dog 18 is then in accurate control over the carriage in conformance with the tabulating or

margin stop

66,64 which has been active. The operation of the lever 28 occurs incidental to tabulations clockwise for the duration of the tabulating run of the carriage 58 by a pull rod 39 to the FIG. 5 position. Incidental to movements of the carriage 58 effected in return direction, either by power or manually, the required clockwise movement of the lever 28 is effected by an element or band 47 which extends along and is carried for movement with the carriage 58. Said band 47 is frictionally contacted by the finger 31 and the leaf spring 32, and as the carriage 58 is initially moved in return direction, the lever 28 is frictionally dragged to the operated position seen in FIG. 5. Carriage return motions are effected a fractional letter space beyond the return position to be obtained, wherefore the carriage position, after a return run, is finally determined by the dog 18 after a fractional-space advance movement. In such overrun and return movement, the lever 28 becomes frictionally dragged to the normal position by operation of the upreaching finger 31 and the leaf spring 32 engaging the band 47 wherein its stop finger 35 engages the stud l5, and so that the escapement dog 18 will engage the correct tooth 46 of the rack 45.

The lever 28 is also operated by the operation of the carriage release bail 48, through downward action on the stud 30. Thus, upon the restoration of the bail 48, the carriage 58 will promptly settle in carriage feed direction and the lever 28 will become restored.

Due to the described form of the lever 28 in reference to the dog 18, it is possible normally for the escapement dog 18 to execute a free and rapid movement counter to the letter feed direction of the carriage and the rack 45, and as an escapement step is being completed, the escapement is ready for renewed operation.

Furthermore, a minimum of parts are required to control the escapement dog 18 so that quiet movement of the carriage 58 is facilitated for carriage returns, tabulations or carriage-release effected carriage movements, and so that upon any such operations the escapement dog 18 will assume control over the carriage 58 in the appropriate step position.

The invention claimed is: 1. In a business machine having relatively movable first and second elements, the combination comprising: an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path,

an escapement dog for permitting free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second elements in an escapement direction opposite said one direction along the escapement path,

said escapement dog having a tooth for engaging the teeth of said escapement rack and being associated with said second element,

said escapement dog being pivotally and slidably supported about a point on said second element for pivotal movement into engagement with said escapement rack and for slidable movement along the escapement path,

a first resilient biasing means for urging said escapement dog into engagement with said escapement rack and for urging said escapement dog against the movement of said escapement rack in the escapement direction along the escapement path,

a control member associated with said second relatively movable element and pivotally supported about the point on said second element, and

said control member being pivotally movable about the point on said second element for acting on said escapement dog to block sliding movement of said escapement dog about the point on said second element in response to the urging of said first resilient biasing means and then disengage said escapement dog from said escapement rack.

2. In a business machine according to claim 1, the

combination further comprising:

a trip lever associated with said second element for disengaging said escapement dog from said escapement rack,

said trip lever being pivotally and slidably supported about the point on said second element for pivotal movement to disengage said escapement dog from said escapement rack and for slidable movement along the escapement path,

a second resilient biasing means for urging said trip lever in a pivotal direction to prevent disengagement of said escapement dog from said escapement rack and for urging said trip lever along the escapement path in the same direction as said first resilient biasing means urges said escapement dog, and

said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path under the urging of said second resilient biasing means in response to the escapement dog being moved pivotally about the point on said second element by the operation of said control member. 3. In a business machine having relatively movable first and second elements, the combination comprising: an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path,

an escapement dog for permititng free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second elements in an escapement direction opposite said one direction along the escapement path,

control means associated with said second relatively movable element for controlling the movement of said escapement dog about the point on said second element, and

said control means being operable in response to the movement of said relatively movable first and second elements in said one direction for pivotally moving said escapement dog from engagement with said escapement rack and for preventing said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.

4. In a business machine according to claim 3, said control means comprising:

a control member associated with said second relatively movable element and being supported for pivotal movement about the point on said second element,

said control member being pivotally movable about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said second element under the urging of said first resilient biasing means, and

said control member being in frictional cooperation with said one relatively movable element for pivotally moving said escapement dog from engagement with said escapement rack in response to relative movment in said one direction between the relatively movable first and second elements.

5. In a business machine according to claim 3, the

combination further comprising:

a tabulating means including a tabulating member movable from a rest position to an actuated position in response to the actuation of a tabulation mechanism, and

said control means being operable in response to the movement of said tabulating member for the rest position to the actuated position for pivotally moving said escapement dog for disengagement with said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement direction along; the escapement path and for preventing said escapement combination further comprising:

said trip lever including pivotally and slidably supported about the point on said second element for pivotal movement to disengage said escapement dog from said escapement rack and for slidable movement along the escapement path,

a second resilient biasing means for urgining said trip lever in a pivotal direction to prevent disengagement of said escapement dog from said escapement rack and for urging said trip lever along the escapement path in the same direction as said first resilient biasing means urges said escapement dog, and

said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path under the urging of said second resilient biasing means in response to said escapement dog being moved pivotally about the point on said second element by the operation of said control means.

7. In a business machine according to claim 6, said control means comprising:

said control member being pivotally movable about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said first element under the urging of said first resilient biasing means, and

said control member being in frictional cooperation with said first relatively movable element for pivotally moving said escapement dog in response to free movement between the relatively movable first and second elements in said one direction.

8. In a business machine according to claim 7, the

combination further comprising:

a tabulating means including a tabulating member operably connected with said control member and movable from a rest position to an actuated position in response to the actuation of a tabulation mechanism, and

said control member being pivotally movable about the point on said second element in response to the movement of the tabulating member from the rest position to the actuated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement direction along the escapement path and for blocking said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means,

9. In a business machine having relatively movable first and second elements, the combination comprising:

an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path,

an escapement dog for permitting free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second element in an escapement direction opposite said one direction along the escapement path,

said escapement dog having a tooth for engaging the teeth of said escapementrack and being associated with said second element,

a control member associated with said second relatively movable element for controlling the movement of said escapement dog about the point on said second element,

said control member being pivotally supported about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said second element in response to the urging of said first resilient biasing means,

a tabulating means incuding a tabulating member operably connected with said control member abd movable from a rest position to an actuated position in response to the actuation of a tabulating mechanism, and

said control member being pivotally movable about the point on said second element in response to the movement of the tabulating member from the rest position to the actuated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escepament direction along the escapement path and for blocking said escapement dog from sliding about the point on said second escapement under the urging of said first resilient biasing means.

10. In a business machine according to claim 9, the combination further comprising:

said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path in response to said escapement dog being moved pivotally about the point on said second element by the operation of said control member.

11. In a business machine according to claim 9, said control member being in frictional cooperation with said one relatively movable element for pivotally moving said escapement dog from engagement with said escapement rack in response to the relative movement in said one direction between the relatively movable first and second elements.

12. In a business machine according to claim 11, the combination further comprising:

a carriage release mechanism having a member associated with said first element and being selectively movable from a normal position to an operated position for acting on said control member, and

said control member being pivotally movable about the point on said second element in response to the movement of said carriage release member from the normal position to the operated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement direction along the escapement path and for blocking said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.

. UNETED STATES PATENT OFFiCE CEBTEFICATE 0F CORRECTION Patent No. 3, 752,289 Dated August 14, 1973 Inventor-(s) Manfred Link It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 46, for "es-capement" read --escapement--. Column 2, line l4, for "quit" read --quiet- Column 3, line 52, for "mechanism" read -for-. Column 4, line 3, for "teetch" read --teeth--; line 11, delete --release-; line 46, for "near"read --nears-; line 56, for "convention" read --conventional--. Column 5, line 26, after "below" insert line 56, before "lever" insert --deconditi0ning-- Column 6, line 35, for "blcok" read --block-- Column 7, line 61, for "for" read --from-- Column 8, line 9, for "including" read --being--. Column 9, line 37, for "abd" read --and--; line 51, for "escapement" read -element-- Signed and sealed this 25th day or December 1973.

(SEAL) Attest:

EDWARDMJLETCHERJR. RENE D. TEGTl [EYER Attesting Officer Acting Commissioner of Patents USCOMM-DC 60376-P6D u.s. sovznmngwr PRINTING OFFIICE: I969 0-356-334.

FORM Po-mso (10-59)

Claims

1. In a business machine having relatively movable first and second elements, the combination comprising: an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path, an escapement dog for permitting free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second elements in an escapement direction opposite said one direction along the escapement path, said escapement dog having a tooth for engaging the teeth Of said escapement rack and being associated with said second element, said escapement dog being pivotally and slidably supported about a point on said second element for pivotal movement into engagement with said escapement rack and for slidable movement along the escapement path, a first resilient biasing means for urging said escapement dog into engagement with said escapement rack and for urging said escapement dog against the movement of said escapement rack in the escapement direction along the escapement path, a control member associated with said second relatively movable element and pivotally supported about the point on said second element, and said control member being pivotally movable about the point on said second element for acting on said escapement dog to blcok sliding movement of said escapement dog about the point on said second element in response to the urging of said first resilient biasing means and then disengage said escapement dog from said escapement rack.

2. In a business machine according to claim 1, the combination further comprising: a trip lever associated with said second element for disengaging said escapement dog from said escapement rack, said trip lever being pivotally and slidably supported about the point on said second element for pivotal movement to disengage said escapement dog from said escapement rack and for slidable movement along the escapement path, a second resilient biasing means for urging said trip lever in a pivotal direction to prevent disengagement of said escapement dog from said escapement rack and for urging said trip lever along the escapement path in the same direction as said first resilient biasing means urges said escapement dog, and said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path under the urging of said second resilient biasing means in response to the escapement dog being moved pivotally about the point on said second element by the operation of said control member.

3. In a business machine having relatively movable first and second elements, the combination comprising: an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path, an escapement dog for permititng free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second elements in an escapement direction opposite said one direction along the escapement path, said escapement dog having a tooth for engaging the teeth of said escapement rack and being associated with said second element, said escapement dog being pivotally and slidably supported about a point on said second element for pivotal movement into engagement with said escapement rack and for slidable movement along the escapement path, a first resilient biasing means for urging said escapement dog into engagement with said escapement rack and for urging said escapement dog against the movement of said escapement rack in the escapement direction along the escapement path, control means associated with said second relatively movable element for controlling the movement of said escapement dog about the point on said second element, and said control means being operable in response to the movement of said relatively movable first and second elements in said one direction for pivotally moving said escapement dog from engagement with said escapement rack and for preventing said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.

4. In a business machine according to claim 3, said control means comprising: a control member associated with said second relatively movable element and being supported for pivotaL movement about the point on said second element, said control member being pivotally movable about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said second element under the urging of said first resilient biasing means, and said control member being in frictional cooperation with said one relatively movable element for pivotally moving said escapement dog from engagement with said escapement rack in response to relative movment in said one direction between the relatively movable first and second elements.

6. In a business machine according to claim 3, the combination further comprising: a trip lever associated with said second element for disengaging said escapement dog from said escapement rack, said trip lever including pivotally and slidably supported about the point on said second element for pivotal movement to disengage said escapement dog from said escapement rack and for slidable movement along the escapement path, a second resilient biasing means for urgining said trip lever in a pivotal direction to prevent disengagement of said escapement dog from said escapement rack and for urging said trip lever along the escapement path in the same direction as said first resilient biasing means urges said escapement dog, and said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path under the urging of said second resilient biasing means in response to said escapement dog being moved pivotally about the point on said second element by the operation of said control means.

7. In a business machine according to claim 6, said control means comprising: a control member associated with said second relatively movable element and being supported for pivotal movement about the point on said second element, said control member being pivotally movable about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said first element under the urging of said first resilient biasing means, and said control member being in frictional cooperation with said first relatively movable element for pivotally moving said escapement dog in response to free movement between the relatively movable first and second elements in said one direction.

8. In a business machine according to claim 7, the combination further comprising: a tabulating means including a tabulating member operably connected with said control member and movable from a rest position to an actuated position in response to the actuation of a tabulation mechanism, and said control member being pivotally movable about the point on said second element in response to the movement of the tabulating member from the rest position to the actuated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement diRection along the escapement path and for blocking said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.

9. In a business machine having relatively movable first and second elements, the combination comprising: an escapement rack having teeth formed thereon and being associated with said first element for relative movement therewith along a predetermined escapement path, an escapement dog for permitting free movement between the relatively movable first and second elements in one direction along the escapement path and for controlling relative movement between the relatively movable first and second element in an escapement direction opposite said one direction along the escapement path, said escapement dog having a tooth for engaging the teeth of said escapement rack and being associated with said second element, said escapement dog being pivotally and slidably supported about a point on said second element for pivotal movement into engagement with said escapement rack and for slidable movement along the escapement path, a first resilient biasing means for urging said escapement dog into engagement with said escapement rack and for urging said escapement dog against the movement of said escapement rack in the escapement direction along the escapement path, a control member associated with said second relatively movable element for controlling the movement of said escapement dog about the point on said second element, said control member being pivotally supported about the point on said second element for acting on said escapement dog to disengage said escapement dog from said escapement rack and to block sliding movement of said escapement dog about the point on said second element in response to the urging of said first resilient biasing means, a tabulating means incuding a tabulating member operably connected with said control member abd movable from a rest position to an actuated position in response to the actuation of a tabulating mechanism, and said control member being pivotally movable about the point on said second element in response to the movement of the tabulating member from the rest position to the actuated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escepament direction along the escapement path and for blocking said escapement dog from sliding about the point on said second escapement under the urging of said first resilient biasing means.

10. In a business machine according to claim 9, the combination further comprising: a trip lever associated with said second element for disengaging said escapement dog from said escapement rack, said trip lever being pivotally and slidably supported about the point on said second element for pivotal movement to disengage said escapement dog from said escapement rack and for slidable movement along the escapement path, a second resilient biasing means for urging said trip lever in a pivotal direction to prevent disengagement of said escapement dog from said escapement rack and for urging said trip lever along the escapement path in the same direction as said first resilient biasing means urges said escapement dog, and said escapement dog having a projection formed thereon for engaging said trip lever to prevent sliding movement of said trip lever along the escapement path in response to said escapement dog being moved pivotally about the point on said second element by the operation of said control member.

12. In a business machine according to claim 11, the combination further comprising: a carriage release mechanism having a member associated with said first element and being selectively movable from a normal position to an operated position for acting on said control member, and said control member being pivotally movable about the point on said second element in response to the movement of said carriage release member from the normal position to the operated position for acting on said escapement dog to disengage said escapement dog from said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement direction along the escapement path and for blocking said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.

15. In a business machine according to claim 3, the combination further comprising: a tabulating means including a tabulating member movable from a rest position to an actuated position in response to the actuation of a tabulation mechanism, and said control means being operable in response to the movement of said tabulating member for the rest position to the actuated position for pivotally moving said escapement dog for disengagement with said escapement rack to permit relative movement between the relatively movable first and second elements in the escapement direction along the escapement path and for preventing said escapement dog from sliding about the point on said second element under the urging of said first resilient biasing means.