DE2130884A1 - Switching device for the type carrier slide of a power-driven typewriter - Google Patents

Description

^ Exercises, June 18, 19 71 wi / b a / fr

Anruelasrin: International Eusiness Machines

Corporation, Armonk, N.Y. 10504

Aratl. File number: I ^ euannmeldung

Applicant's file number: Docket LE 969 040

Switching device for the type carrier slide

£ ine _ ^ _ kjca_f tang-powered ^ typewriter

The invention relates to a switching device for the type carrier slide or writing car of a power-driven typewriter with two parallel racks mounted in the machine frame or, in the case of typewriters, on the typewriter, namely a stationary / cooperating with a retaining pawl Holding rack and a longitudinally displaceable, with a ratchet interacting rack / der a push movement is issued for each switching step.

The basic mode of operation of such, for example in the switching device described in US Pat. No. 2,281,775 is such that for performing a switching step in the forward scanning direction the pawl located on the type carrier slide is released to engage the gear shift rack and then the toothed rack is given a longitudinal movement, with the type carrier carriage being carried along; at this feed movement the retaining pawl slides over the rear flank of the next fence of the retaining rack and engages in front of it, whereupon ax shift rack is reset and now the pawl itself slides over the next tooth or is used. This arrangement is for uniform switching

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step size provided and only for the forward shift, so, for the switching steps when printing the characters and when triggering spaces, applicable, so that for the downshift device a separate switchgear must be provided.

However, there are also typewriter controls for both switching directions known, with either a friction wheel drive (US Pat. No. 2,418,474, German Pat. No. 1,096,926) or two switching wheels each assigned to one of the two directions of movement are provided, each with a pawl and a pawl interact and alternatively via a threaded spindle control the carriage step movements. With this latter, in the German patent specification 231 400 shown Arrangement should be for the use of a typewriter Western and Eastern writings are made possible.

In another known from German patent specification 833 045 Switching device, the switching step control takes place via a controlled by the locking device, with the rack on the Carriage engaged pinion, with the rack optionally above to reverse the direction of movement of the carriage or can be attached symmetrically below the pinion. For changing the direction of switching movement of the writing carriage it is therefore necessary to convert the machine.

The problem underlying the invention with the known Explanations have not been solved and not even by modifications of the known basic stepping devices is solvable, consists in the fact that with typewriters with the different width of the individual characters adapted proportional Switching step a downshift of the type carrier slide or writing carriage to a character position with the known proportional stepping machines either only after the A sense of proportion is possible or can only be carried out with the help of a separate device, by means of which the switching step sizes the characters already printed in a line or

2 09822/0463

Docket LE 969 040

of a line segment can be saved. The former method often leads to errors _{f in} that, despite the use of tools for finding the character positions, incorrect prints occur, while a memory device for the switching steps means a considerable additional effort.

The task of a switching device for both switching directions of the type carrier slide a proportional switching step device To create was according to the invention by the in claim 1 marked switching device released. The switching device according to the invention is based on the principle of operation type mentioned at the beginning and for the first time enables the type carrier carriage or writing carriage of a typewriter optionally and to switch different sized switching steps forwards or backwards. For switching to reverse an additional coding key is preferably used here, while it is actuated together with the relevant type keys all switching step sizes can be triggered as a downshift step - without a character print.

Numerous advantageous developments of the invention are contained in the subclaims.

The invention is explained below with reference to the drawings in an exemplary embodiment. Show it:

1A is a perspective view of part of a

Two directional indexing device for the type carrier slide of a typewriter with a spherical type carrier, in an extended Arrangement, -

Fig. IB is a perspective view of the remaining parts

the stepping device according to Fig. IA, also in an expanded arrangement,

Docket Li ^ 9 69 u-io ₂ 0 9 8 2 2/0 ^{A 6 3 B AD ORIGINAL}

Fig. 2 is a plan view of the ratchet mechanism of

Arrangement according to Figs. IA and IB with excavated Ratchets,

Fig. 3 is a plan view of the ratchet mechanism

according to Fig. 2, but with a pawl in engagement with the movable rack,

Fig. 4 is a plan view of the ratchet mechanism according to

Fig. 2, with all ratchets in the engaged state,

Fig. 5 is a diagrammatic detailed view of the tabulation

pawl and the tab lever of the switching device according to Fig. IB,

FIG. 6 is a diagrammatic view of the for the arrangement according to FIG. IA and IB used / assigned to the keyboard and coding device

7 shows a time diagram to illustrate the sequence of movements of the most important parts of the arrangement according to FIGS. IA and IB during a complete working cycle.

BAD ORIGINAL Docket LE 969 040 _209822/0463

According to FIG. 1B there is a type carrier (indicated by dash-dotted lines) 10 mounted in the form of a flattened ball on a type carrier carriage 11 so that it can be used to set the selected type character can be rotated and tilted. The type carrier slide 11 is stationary on a pressure shaft 12 parallel to one The platen 14 mounted in the typewriter is displaceably guided.

On the type carrier carriage 11 there are two sets of pawls, namely a first set of retaining pawls 15, 16 and 17 and a second set of switching pawls 18, 19 and 20, all on a rod 21 are rotatably mounted, which in turn protrudes from a plate 22 located on the type carrier carriage 11 downwards. the six pawls 15 to 20 thus make all step movements of the type carrier carriage 11 with.

The holding pawls 15 to 17 cooperate with a holding rack 23, which is secured in the frame of the typewriter by means of screws 25 is fixed in place. Thus, when at least one of the holding pawls 15 to 17 is in engagement with the holding rack 23 is the information of the lock between the type carrier slides 11 and the holding rack 23 each movement of the type carrier carriage 11 with the type carrier 10 prevented.

The wide ratchet, namely the switching pawls 18 to 20, act with a gear rack 26, which is parallel to the holding rack 23 and is guided at a certain distance from this also by means of the screws 25, with between the two racks 23 and 26 spacer disks 27 are provided. By means of I ^ nglöcher 29, through which the screws 25 protrude, is the switching rack 26 can be displaced by a limited amount relative to the holding rack 23 parallel to the type carrier slide movement. When the pawls 18 to 20 are in engagement with the shift rack 26, there is a positive drive use between the switching rack 26 and the type carrier carriage 11, and the latter can corresponding switching

Docket LL 969 040 209822/0463 BAD ORIGINAL

Carry out the steps as long as the retaining pawls 15 to 17 are lifted out. The respective step size and direction of the type carrier chIittens thus depends on the corresponding adjustment movements the shift rack 26 from.

According to FIG. 1A, the forward movement of the shift rack 26 (So to the left, as FIGS. IA and IB are views from the rear the typewriter) via an incision 30 in a drive plate 31 and a shoulder 32 on an angle lever 33 causes - which is rotatably mounted on the frame of the typewriter by means of a collar screw 34; the drive plate 31 is thus effective via the shoulder 32 on the angle lever 33, pivoting it. One on the one hand on the drive plate 31 and on the other hand, the spring 34 * suspended from the frame of the machine ensures that the drive plate 31 is always in one direction of rotation counterclockwise rests against the collar screw 34 so that the incision 30 on the drive plate 31 is constantly with it the extension 32 on the angle lever 33 remains in contact. By means of a tension spring 35, the adjusting movement of the angle lever 33 is carried out transferred to an angle lever 36, which is also pivotably mounted on the collar screw 34.

As a result of the angle lever 36 in the manner described This is transferred counterclockwise pivoting movement on a pölzen 3? effective on the switching rack 26 and shifts this in the forward direction, ie to the left »The opposite Versfcellrichtung of the holding rack 26, namely in the downshift direction (to the right in FIG. 1A), as follows Will be described in detail, caused by the angle lever 33 by means of the angle lever 36 a Experienced swivel movement clockwise.

The amount of the linear adjustment movement of the rack 26 is determined by the respective position of a step stop 38, which is about an axis fixed in the frame of the machine 57 is pivotally mounted and a plurality of Ans ch lagstufen

Docket LE 969 040 209822/0463 BAD ORIGINAL

39 to interact with a shoulder on the rack having. The extension 40 is adjustably attached to the underside of the shift rack 26. The adjustment path of the gear shift rack 26 is the smaller, the further the step stop 28 is pivoted downwards, since its stop steps 39 extend from below enlarge upwards.

Since the drive plate 31 performs a constant drive stroke during each cycle of the machine begins, the tension spring 35 in each case the non-transferred to the switch rack 26 on Verstellhubanteil; because the pivoting movement of the angle lever 36 is ended when the projection 40 hits the respective set stop step 39, while the angle lever 33 always runs through the entire pivoting range caused by the drive plate 31.

When the pawls 18 to 20 are lifted out of the rack 26 and the drive plate 31 transmits an adjustment movement to the angle lever 33 via the projection 32 , the tension spring 35 pulls this clockwise so that it rests against a bolt 46 on the rack 36. Since the distance of the "bolt" 46 from the axis of rotation of the angle levers 33 and 36 (collar screw 34) is less than the distance between the bolt 37, the angle lever 33 exerts a greater force on the rack 26 via the bolt 46. As a result, this is returned to its original position, iii which the angle levers 33 and 36 both lie against the Bol zen 37 and 46. In this position, the geometric axes of the boles 37 and 46 lie on a line which runs at right angles to the gear shift rack 26 and through the fulcrum of the angle levers 33 and 36.

If the shift rack 26 is to be adjusted in the opposite direction, namely downshifting (thus to the right in FIGS connected. As a result of this actuation, the downshift lever 41 leads about an axis 43 '

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Docket LE 969 040

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- O -

Swivel movement counterclockwise and adjusts the Drive plate 31 against the force of the spring 34 'so that the incision 30 comes out of alignment with the projection 32 and instead, an incision 44 on the drive plate 31 is aligned with a shoulder 45 on the angle lever 36. The spring 34 'cares however, for the incision 44 and the projection 45 to remain aligned with one another only as long as the bellows 42 is effective on the downshift lever 41.

The drive stroke movement of the drive plate 31 now causes a clockwise pivoting movement of the angle lever 36 around the collar screw 34 as the fulcrum, and this movement is transmitted via the tension spring 35 to the angle lever 33, which is pivoted clockwise and acts on the bolt 37 on the rack 26 . As a result, the shift rack 26 is now adjusted in the downshift direction, until a likewise on the underside of the shift rack 26 adjustably attached, located on the opposite side of an incision 48 approach 47 abuts one of the stop steps 49, which is on the opposite side of the Step stop 38 are arranged. In the same way as described above for the forward movement, the size of the reset step is now dependent on the set position of the stepping stop 38 in the incision 48 of the shift rack 26 in the same way as before in connexion with the adjustment of the switching rack 26 in pre- - Described in the downward direction , the pivoting movement of the angle lever 33 is ended when the projection 47 strikes the set stop step 49 of the step stop 38, and the further movement of the drive plate 31 and the angle lever 36 is absorbed by the tension spring 35.

In excavated switch pawls 18 to 20, and when the drive plate is returned 31 to the left, so that no force is transmitted to the bell crank 36 through the neck 45, the tension spring 35 the angle lever 36 counterclockwise back so far until it on the bolt 46 is pending «Since the-

^; -: ·. ■ = ■ · 209822/0463 _BAD original

Docket LE 969 040

sen distance to the fulcrum of the angle levers 33 and 36, as already mentioned, is less than that of the bolt 37 against which the angle lever 33 rests, is from the angle lever 36 over the bolt 46 exerted a greater force on the shift rack 26. This therefore returns to its original position in which both Angle levers 33 and 36 rest on bolts 37 and 46 and, as already described, the connecting line between the two bolt centers perpendicular to the shift rack 26 and through the pivot point the angle lever 33 and 36 runs.

The drive movement for the drive plate 31 is provided by the pressure wave 12 derived, on which there is a cam disk 51 for this purpose, which via a cam follower roller 52 on a Cam follower arm 53 is effective. A link 54 is hinged to this, the other end of which is welded to the drive plate 31 is. The pressure wave leads one rotation in the direction of each cycle - even if no type stop has been triggered counterclockwise.

As mentioned, the amount of linear adjustment is the shift rack 26 depends on which of the stop levels 39 or 49 is set in the active position to the approach 40 and 47 respectively. In the example shown, there are a total of seven stop levels 39 and 49 are provided, which correspond to a step feed of 1, 4, 5, 6, 7, 8 or 9 switching step units. The largest switching step the shift rack 26, namely nine units, is executed when the step stop 38 is in its uppermost position is located, so the lowest stop steps 39 or 49 interact with the approach 40 and 47, respectively. This position corresponds to at the same time the normal or starting position of the step stop. The reverse is the case with the smallest step feed, namely by one Switching step unit when the step stop 38 is set in its lowest position.

On the drive plate 31 there is an angled portion 55 which participates in the drive movements of the drive plate 31, and

Docket LE 969 040 2 0 9 8 2 2/0 A 6 3 BAD ORIGINAL

although in their initial position on a nose 56 of the crotch stop 38 is applied to hold this in its previously defined Ausgngslage, in which the lowest stop levels 39 and 49 are in the operative position. A spring 58 (shown on the right in FIG. 1A, pulling downwards) causes the constant contact between the bend 55 and the nose 56 and thus also ensures that when the drive plate 31 moves back, the nose 56 remains adjacent to the angled portion 55 until the clockwise pivoting movement of the step stop 38 is ended.

A bolt 59 which is also rotatably mounted on the axis 57 and whose extension 59a also rests on the angled portion 75 follows in the same way of the return movement (to the right) of the drive plate 31, under the action of a spring 59b, which rotates clockwise on the bolt 59 is effective. Therefore, when the drive plate 31 is in its original position is located, the bend 55 the bolt 59 against the force of the spring 59b in its normal position.

The amount of pivoting movement of the step stop 38 in the clockwise direction under the action of the spring 58 is determined by the position of an actuating lever 60, an intermediate lever 61, two further actuating levers 62 and 63 and a cross piece 64. The levers 60, 61 and 62 are on one in the machine frame mounted axis 65 rotatably mounted, while the actuating lever 63 on another, also mounted in the frame Axis 66 is rotatably guided. The crosspiece 64, on the other hand, is longitudinally displaceable by means of screws 67 guided through slots 68 guided at the crotch stop 38.

At one end of the operating lever 60 is a with a Approach 70 on the crosspiece 64 interacting finger 69. The intermediate lever 61 is correspondingly provided with a finger 71, which cooperates with a further approach 72 on the crosspiece 64. Finally, there is a finger 73 on the actuating lever 62 for interacting with a third projection 74 on the transverse

Docket LE 969 040 2 0 9 8 22/0463 £ AD ORIGINAL

- li -

piece 64. When the cross piece 64 is in a position in which the levers 60, 61 and 62 with their fingers 69, 71 and 73 are aligned with the lugs 70, 72 and 74, respectively, as shown in FIG. 1, the finger 71 prevents an adjustment of the Step stop 38 under the action of the spring 58 when the Drive plate 31 is adjusted in the forward direction (to the right). The step stop 38 therefore remains in his in this case Starting position in which the stop stages 39 and 49 are effective for the maximum adjustment of the rack 26, for forward and reverse shifting.

To move the cross piece 64, a pressure signal is fed to a bellows 76 via a line 75, under the action of which the actuating lever 63 causes the cross piece 64 to be shifted to the right by means of a finger 77 acting on a shoulder 78 on the cross piece 64 Approaches 70, 72 and 74 no longer aligned with the fingers 69, 71 and 73 of the levers 60, 61 and 62, with the result that the pivoting movement of the step stop 38 is released by a small amount, namely until the lower edge 78 'of crotch stop 38 abuts finger 71 of intermediate lever 61; because, as can be seen from FIG. 1A, the lower edge 78 ¹ protrudes into the cutouts between the shoulders 70, 72 and 74.

When the drive plate 31 is actuated, the next arrive Stop steps 39 and 49 of the step stop 38 in the operative position, namely the second from above, which has an adjustment path the shift rack 26 is assigned to eight units.

To set a seven-unit step, use the same procedure an actuating pressure signal is supplied to a bellows 80 via a line 79, which via a part 81 of the actuating lever 60 this pivots clockwise about the axis 65, so that its fingers 69 lie under the shoulder 70 of the crosspiece 64 comes. The actuating lever 6O acts simultaneously on the intermediate lever 61 by means of its part 81 via an arm 82

Docket LE 969 040 * ³ " ^{/ U} ^ ^J BAD ORIGINAL

and swivels this clockwise about the axis 65, so that the Finger 71 is moved out of the pivoting range of the extension 72 of the crosspiece 64. As a result, now if only the bellows 80 was actuated, the pivoting movement of the step stop 38 transmitted by the drive plate 31 by the striking of the Extension 74 of the cross piece 64 on the finger 73 of the actuating lever 62 is limited, which makes the setting of the stop stages 39 and 49 corresponds to the seven-unit position.

As mentioned, the actuation of the drive plate 31 also leads the bolt 59 from a pivoting movement, under the action of the spring 59b. When the actuating lever 60 is pivoted clockwise by the bellows 80 in the manner described, ensures a lug 83b on an arm 83a of the finger 83 located on the bolt 59 that the actuating lever 6O when the Bellows 80 is reset, remains in its position in which the finger 69 is pivoted out of the area of action of the projection 70. In this way it is ensured that the operating lever 60 does not return to its position shown in Fig. La and that the operating lever 62 is not effective is until the drive plate 31 is returned to its starting position shown in Fig. IA at the end of the cycle. A clear adjustment operation is thus guaranteed by these measures.

In the normal position of the bend 55, on which the projection 59a is constantly in contact, the finger 83 of the bolt 59 is normally to the side and in front of the projection 83b of the actuating lever 60 on the front side of the extension B3b unhindered from swiveling over »The clockwise pivoting movement of the mirror 59 is ended as soon as the end 83c of the arm 83a of the bolt 59 reaches the area of the lower edge of the extension 83b. If the actuating lever 60 is switched on, its extension 83b limits the pivoting movement of the bolt 59 generally clockwise, acting on the arm 83a, since the finger 3 is now on cor

Docket LE 969 040 2 0 9 8 2 2/0463 -

rad ORIGINAL

Back of the approach 83b is located. For a step adjustment of the rack 26 by six switching step units the bellows 80 and the bellows 76 are actuated simultaneously. As a result, the crosspiece 64 is adjusted to the right in the manner described, so that the lower edge 78a of the crotch stop 38 with the finger 73 of the actuating lever 62 cooperates, so a slight further pivoting of the step stop 38 allows than it provided for seven units.

For a five-unit steepening of the retaining rack 26 is obtained a further bellows 85 via a line 84 an actuating pressure pulse, whereby an angled 86 of the actuating lever 62 this is pivoted about the axis 65 clockwise and the finger 73 is removed from the area of action of the projection 74. Simultaneously with this, the bend 86 actuates the intermediate lever 61 via an arm 87, so that its finger 71 is out of the range of action of the approach 72 is removed. The pivoting movement of the step stop 38 is therefore now as soon as the drive plate 31 is actuated - limited by the interaction of the projection 70 and the finger 69 on the actuating lever 60.

Analogous to the procedure for the six-unit setting, the Bellows 76 a pressure pulse, with the result that the crosspiece 64 is displaced and, upon actuation of the drive plate 31 of the Finger 69 now interacts with the lower edge 78 'of the crotch stop 38 instead of with the shoulder 70, whereby an enlargement of the switching step is achieved by one step unit.

Whenever the actuating lever 62 is pivoted by the action of the bellows 85, the finger 83 of the bolt 59 grips an attachment 87 ^{1 of} the actuating lever 62 as soon as the drive plate 31 becomes effective. As a result, when the pressure pulse to the bellows 85 has ended, the actuating lever 62 is held in its position. When the operating lever 60 is not actuated, the pivoting movement of the bolt 59 in the clockwise direction is controlled by the end 83c of the

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Arm 83a is limited as soon as it hits the lower edge of the projection 83b. In the same way, if the bellows 76 the Cross piece 64 moves, an approach 88 of the bolt 59 to the stop on one side of the finger 77 of the operating lever 63 in order to hold the latter in its position, into which it is adjusted by the bellows 76 during the pivoting movement of the bolt 59 became. These measures serve to achieve the desired effect despite the possibly relatively short pressure pulses to the bellows Maintain setting for the duration of the work cycle. In a corresponding manner, the approach 88 of the bolt 59 is on the the other side of the finger 77 of the actuating lever 63 is effective in order to adjust the actuating lever when the crosspiece 64 is not actuated 63 to prevent.

For switching the rack 26 by one switching step unit, which usually only happens when downshifting, all three bellows 76, 80 and 85 are actuated, with the result that all three fingers 69, 71 and 73 of the levers 60, 61 and 62 are pivoted out of the range of action of the lugs 70, 72 and 74, respectively and at the same time the crosspiece 64 is moved. In the process, a shoulder 89 of the intermediate lever 61 comes into the pivoting range of the lower edge 78 'of the step stop 38, whereby the maximum Adjustment range of the step stop 38 is made possible and the uppermost stop steps 39 and 49 in the operative position get to approaches 40 and 47, respectively.

The bellows 76, 80 and 85 are controlled in the following described way depending on the key and function actuation of the typewriter. Depending on the type and function key being pressed, there is no bellows, on Bellows alone, two bellows at the same time or the actuation of all three bellows triggered at the same time. The necessary Compressed air supplies a pump 90 (FIG. 6) which is connected by means of a line 91 to a pneumatic control valve. This consists of selector rails 93, 94, 95, 96, 97, 98 and 99, which are between a normal position and an actuation position

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Docket LE 969 040

213088A

_f are longitudinally displaceable depending on coding rockers 100, 101, 102, 103 _f 104 _r 105 and 106 that interact with them.

The coding rockers 100 to 106 are in turn actuated by intermediate levers 107 which are individually switched on by the key levers. which, when the button is pressed, come into the range of action of a vane shaft 108 and towards the front of the machine be moved, in a combination representing the typed character or the activated function. The selected Coding swing actuate the selector rails assigned to them from the normal position to the actuation position, while the rest of the selector rails 93 to 99 remain unchanged.

The pneumatic control valve 92 also has a coding rail 109 and a switching rail 110 which, like the selector rails 93 to 99, can each be displaced from their normal position into the actuating position against the force of a spring 110 '. The coding rail 109 is actuated by means of a coding button 111 and by rotating a shaft 112, a pin 113 on an arm 114 attached to the shaft 112 switching on an intermediate coding lever 115 against the force of a spring 116, i.e. reaching the area of the vane shaft 108. When the vane shaft 108 is coupled, the coding rail 109 is adjusted via an attachment 117 of the intermediate coding lever and by means of a finger 118. Similarly catfish the arrangement is made to actuate the Umschaltschiene 110 _f by upon actuation of the shift key and connection of the Umschaltzwischenhebels (both not shown), it is effective by means of an approach of a finger 119 on the Umschaltschiene 110th

In the selector rails 93 to 99, the coding rail 109 and the switchover rail 110 are openings, each in the rest position, in the actuated position or in both positions become effective, whereby certain connections from an input manifold 120 of the pneumatic control valve to an output manifold 120 'can be produced. To the output distributor

DOCt »969 0«, ^209822/0 «3 _BAD0R1Q1NAU

120 'are the lines 43, 75, 79 and 84 for the bellows 42, 76, 80 or 85 connected; additional lines 121 lead to further functional groups of the typewriter, and overall, thus including the aforementioned lines 43, 75, 79 and 84, there are about 20 lines on the output side of the pneumatic Control valve 92 connected.

The construction and mode of operation of the pneumatic control valve 92 are described in detail in U.S. Patents 1,089,689 and 2,115,991 described, while the interaction of the intermediate lever 107 and the coding rocker 100 to 106 and the operation of the vane shaft 108 in relation to intermediate levers 107 in U.S. Patent 3,086,635. These operations are therefore not described in detail here.

With each revolution of the filter shaft 108, a duplex cam 122 is actuated via a cam follower arm 123 mounted on a bolt 124 and a spring 125 which, on the one hand, is inserted into a pin 126 in the cam follower arm 123 and, on the other hand, into a pin 127 of a lever 128 is hooked, this lever 128, wherein it is pivoted counterclockwise about a bolt 129 and on a bracket at the input manifold 120 of the pneumatic control valve 9 2 is effective. This has the consequence that the actuated selector rails in the Control valve 92 are held in their adjusted position and at the same time a seal of the control valve 9 2 against loss of compressed air is achieved. In the further course of the rotation of the vane shaft 108, a push rod 131 causes between the pin 126 and the pin 127 the return of the lever 12 8 in its inoperative Starting position. The end of the push rod 131 connected to the pin 127 is for the purpose of the relative mobility of the transmission parts formed forked to each other.

With every half turn of the vane shaft 1OR, an eccentric disc 132 the pump 90 for delivering a pressure pulse effective.

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Docket LL 969 ΟΊΟ

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The eccentric disk 132 is fastened on a shaft 133 and connected to a gear wheel 135 on the vane shaft 108 via a gear wheel 134 and an intermediate gear. This arrangement ensures that the pressure pulse from the pump 90 to the control valve 92 is delivered exactly at a desired time during cycle ^{1 of} the machine and, according to the setting of the selection rails 93 to 99, the coding rail 109 and the switching rail 110, is fed to the actuating units will.

The following table shows the positions at which the selection rails 93 to 99, the coding rail 109 and the switching rail 110 have openings or not. A "1" indicates that the rail in question in this position, ie assigned to the channel in question, only has an opening when the rail is in its actuated position. A ¹ O "represents that each rail is provided in the associated channel position only in its non-actuated, ie the starting position with an opening A."'-"indicates that this rail in the corresponding channel position in both the unactuated and in the actuated position is provided with an opening.

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93 94 95 96 97 98 99 110 109 _ 1 - "" j type selection ) 1.
steering > J channel Il
1 _ _ 1 A-I 1 _ _ _ - - 1 A-2 1 _ - - _ _ ι A-3 1 _ _ - - 1 / 2nd velocity A-4 _ _ 1 _ - - - - - steering A-5 _ _ - 1 - _ _ ι _β A-6 _ _ _ _ 1 _ - 1 A-7 O 0 0 1 0 0 0 _ - 0 A-8 0 0 1 0 1 0 _ - 0 A-9 1 1 0 1 0 _ 0 - - 0 A-IO 1 1 0 1 0 1 0 _ - 0 A-Il 0 1 0 1 0 1 0 0 A-12 1 0 1 0 1 0 _ _ ■ Type choice A-13 0 1 0 1 0 0 1 1 0 Type choice A-14 1 - - - Type choice A-15 - - - - - - 1 - 1 t type selection BI - - - - 0 1 1 vat ··· - Type choice B-2 - - - 1 1 0 1 _ _ ) Cycle coupling B-3 1 0 1 - 1 1 1 _ -. Normal shift B-4 0 0 0 0 1 0 1 O Switching B-5 - 1 1 0 1 1 1 - Line break B-6 1 1 1 1 - 0 1 Slide back up B-7 0 1 1 1 - - 1 Tab (bellows 207) B-8 1 0
0 1
0 0
0 0 0
0 1
1 Rail reset B-9
B-IO 0 0 - 0 0 1 1 <Downshift
J (bellows 42) B-Il - 0 - 0 1 1 1 -ν B-12 0 1 1 - - 1 1 B-13 0 0 1 1 1 1 1 B-14 1 0 1 1 0 1 1 B-15 1 0 0 1 1 1 1 B-16 1 0 0 0 0 - 1 B-17 0 0 0 1 1 - 1 B-18 - - - - - - 1 C-I 0 0 0 0 0 O 1 C-2 - 0 1 1 0 0 1 C-3 0 1 1 0 1 0 1 C-4 1 O 1 0 1 0 1 C-S 0 0 0 1 1 _ - 1 C-6

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channel

DI
D-2
D-3
D-4
D-5
D-6

93

94 95 96

97

98

39

110 109

1
O

1
1

1
1

0 O 1 0 0

0 1 0 0 0

0 0

1 1 1 1 1 1

0 1

D-8 - - 1 1 0 1 1 O D-9 1 0 - 1 1. O 1 O D-IO 0 - 1 1 1 O 1 O D-Il 1 1 1 1 0 O 1 O D-12 0 0 0 1 0 1 1 D-13 1 0 1 0 0 - 1 1 D-14 0 0 0 0 0 O 1 1 D-15 0 1 1 1 0 O 1 1 D-16 1 0 O 1 0 1 1 1 D-17 1 0 1 0 1 O 1 1 EGG 0 0 O 1 1 O 1 - E-2 0 O O 1 0 1 1 • - E-3 0 0 1 0 1 O 1 - E-4 0 1 1 1 0 O 1 O E-5 1 1 1 0 0 - 1 O E-6 1 O 1 0 1 O 1 O E-7 1 0 . 0 1 0 1 1 O F-I 0 - . - 1 1 ■ - ■ 1 - F-2 1 0 - .1 1 - 1 - F-3 - - - 0 1 - 1 O F-4 0 0 1 1 0 - 1 F-5 - - 1 0 1 O 1 1 F-6 0 - - 0 0 - 1 1 F-7 1- 1 1 0 0 - 1 - F-8 1 σ - 1 ο " O 1 F-9 - - . 1 1 O 1 1 1 F-IO ' 1 1 1 1 1 1 1 - · F-Il - 0 0 0 O O 1 - F-12 - 0 - 0 1 1 1 1 F-13 0 1 1 - O O 1 O F-14 1 O 1 0 O 1 1 O F-15 1 0 0 1 O 1 1 O F-16 1 O O 0 O 1 1 1 F-17 0 1 1 0 1 1 1 1 F-18 1 1 . 1 1 O O 1 1 F-19 0 0 0 1 O 1 1 _

> Step control (bellows 80)

> Step control (bellows 85)

/ Step control (bellows 76)

209822 / OA63

To explain the table, an example is taken from channel A-I5, through which a pressure pulse can only pass when the encoder rail 109 is actuated; this is true if the code button 111 has been pressed to initiate a jerk step. The line 75 receives a pressure pulse only when one of the channels F-I to F-9 has passage. In this case, receives the bellows 76 to control the switching step size a pressure pulse, with the result that the operating lever 63 is adjusted. For example, a pressure pulse always reaches the bellows 76 through the channel F-I when the selector rail 93 is in its starting position is and the selector rails 96, 97 and 99 have been adjusted, while the position of the selector rails 94, 95 and 98, the coding rail 109 and the changeover ticket 110 can be any.

The line leading to the bellows 80 receives in a corresponding manner 79 pressure impulses through channels D-I to D-17. For example, will the bellows 80 actuated through channel D-I when the select rails 97 to 99 were actuated, while the position of the remaining rails, namely the selector rails 93 to 96, of the coding rail 109 and the switching rail 110 is arbitrary. In an analogous manner, the channels E-I to E-7 are assigned to the line 84 leading to the bellows 85; As already described, the passage of a pressure pulse results in the adjustment of the actuating lever 62.

The channels AI to A-6 are used to select a typed-in type, while the channels A-7 to A-15 are provided for activating other functions of the typewriter. As can also be seen from the table, the channels BI to B-18 are assigned to a first velocity control, while the channels CI to C-6 operate a second velocity control. The various settings for the impact strength control cause different acceleration of the type head for printing, and a non-printing position can also be selected, which is also effective when a downshift step is triggered, in order to completely prevent the printing of the type carrier 10. In this case, channels BI and CI are used for the slack one

209822/0463

Docket LE 969 040

BATH ORIGINAL

Pressure pulse made effective.

When explaining the holding pawls 15 to 17 and the switching pawls 18 to 20 has already been pointed out that to carry out a switching step of the type carrier 10 via the shift rack 26, the pawls 18 to 20 are in Are engaged with the shift rack 26, while the retaining pawls 15 to 17 are excavated from the holding rack 23. After the selected character has been printed and before completion of the corresponding cycle, the holding pawls 15 to 17 are used for Re-engagement with the shank rack 23 released while the ratchets 18 to 20 are lifted out of the rack 26.

These pawl movements are controlled by means of a cycle cam 140 (Fig, IBJ, which is attached to a socket 139 is, which in turn is connected to the type carrier carriage 11 and is longitudinally displaceable on the pressure shaft, its rotational movements but participate. The cycle cam disk 140 is actuated via a cam follower roller 141 on one of the type carrier slides 11 rotatably mounted cam follower arm 142 a lever 143, which a spring 144 suspended on the plate 22 to the rear of the machine pulls there. When the lever 143 is pulled forward by the cycle cam 140, a retaining pin 145 on a Arm 146 of lever 143 from notches 147, 148 and 149 in the ratchets 18, 19 and 20 respectively. The switching pawls 18 to 20 are with their notches 147 to 149 on the retaining pin 145 by means Springs 150, 151 and 152, which are between the ends of said switching pawls and the plate 22 of the type carrier slide 11 are attached. If now, as described, the lever 143 forwards, that is shown in FIGS. 2 to 4 down how indicated by arrows »is adjusted, the ratchets 18 to 20 around rod 121 by means of springs 150 to 152. pivoted until one of the three ratchets is between two teeth 153 of the gear rack 26 comes into engagement. According to FIG. 3, the two teeth 154 of the pawl 18 fully engage between them

209822/0463

- = -: · ■ BAD ORIGINAL

Docket LL 969 040

two teeth 153 of the shift rack 26, while the two Teeth 155 of the pawl 19 only in half the tooth height in a ^ - are handle and the two teeth 156 of the pawl 20 only extend to the tooth head, since one of the two teeth 156 on one the teeth 153 of the gear rack 26 rests.

The teeth of one of the three pawls 18 to 20 can engage in the toothing of the gear shift rack 26 or accommodate a tooth 153 between them, depending on the position of the gear shift rack 26 at the moment the pawls 18 to 20 are released 3 represents one of a total of six possible different positions of the switching pawls 18 to 20 relative to the switching rack 26. When the lever 143 has reached the position shown in FIG 143, a projection 157 acts on a nose 158 on a lever 149 and pivots it counterclockwise around the rod 21 (FIG. 2). As a result, a locking lever 160 is pivoted clockwise about a bolt 161 which is fastened in the plate 22 and protrudes downwards through a slot 163 in the locking lever 160. This pivoting movement of the locking lever 160 is transmitted by means of a pin 164 located on it, which protrudes through an elongated hole 165 in the lever 159. The pivoting of the locking lever 160 takes place against the force of a spring 166 suspended on the one hand in its eyelet 166 'and on the other hand in the plate 22, and in the course of this pivoting comes a driver 167, the shape of which is beveled edges 167' adapted to the ratchets 18 to 20 to the effect by completely engaging the switching pawls 19 and 20, which were not yet fully engaged in the switching rack 26, between the teeth 153 thereof. The lower surface 168 of the locking lever 160 then effects the locking in the engaged position via the upper edges 168 'of the switching pawls 18 to 20.

As a result of the further pivoting movement of the lever 159, Docket le 969 040 209822/046 3 hits

its arm 169 (FIG. 1B) on the lugs 170 of the holding pawls 15 to 17 and swivels them around the rod 21 against the force of springs 171 out of engagement with the holding rack 23. Now, in the manner described above, by means of the drive plate 31, the switching step movement of the switching rack 26 take place.

Has the shift rack 26 with the type carrier carriage 11 and When the type carrier 10 reaches the new switch position, the retaining pawls 15 to 17 must engage in the retaining rack 23 released and at the same time the pawls 18 to 20 are lifted out of the rack 26. The cycle cam is used for this 140 releases the return movement for the lever 143 under the action of the spring 144, corresponding to an upward movement in FIGS. 2 to 4, so that now the lever 159 by means of the springs 171 of the holding pawls 15 to 17 around the rod 21 is swiveled back clockwise. The release of the holding pawls 15 to 17 takes place for engagement in the holding rack 23, the lugs 170 of the three retaining pawls remaining in contact with the arm. The adjusting force of the three springs 171 is sufficient from, via the lever 159 also to bring about the return of the locking lever 160 counterclockwise, with the result that the lower surface 168 of the locking lever comes free of the upper edge 168 'of the pawls 18-20. When the return movement of the lever 143 continues the retaining pin 145 on the arm 146 back into the notches 147 to 149 of the switching pawls 18 to 20 and lifts them out of the position of engagement with the switching rack 26 into the position shown in FIG Position off. In the sequence of operations shown, it is noteworthy that that the pawls 18 to 20 can only disengage when the holding pawls 15 to 17 in the Retaining rack 23 have collapsed. As a result, the type carrier 10 is reliably held in the new switch position.

The pawls 18 to 20 are not only, as already mentioned, mounted pivotably about the rod 21, but can by means of

Docket LE 969 040 209822/0463

BATH ORIGINAL

Elongated holes 72 also relative to the rod 21 and relative to one another to be longitudinally displaced by a limited amount. This is necessary so that the pawls can assume the position shown in FIG. 3 and in FIG.

The operation of the devices described is explained below. According to FIG. 7, a type key is first pressed, which triggers a corresponding adjustment of selected selector rails 93 to 99 and, if applicable, of encoder rail 109 and switchover rail 110 in the pneumatic control valve 92. This enables certain channels of the Durchflußkanä le AI to A-15, BI to B-18, CI to C-6, DI to D-17, EI to E-7 and FI to F-19 for the passage of a pressure pulse.

As FIG. 7 shows, the adjusted rails reach their adjustment point at this point, and during this time the pump 90, triggered by the eccentric disk 132 driven by the vane shaft 108, begins to build up the required impulse pressure until a corresponding pressure impulse immediately thereafter the selected one the bellows 76, 80 and 85 is fed, whereby the associated levers 60 to 63 are actuated practically without delay. At the same time, the bellows 42 for engaging the cycle clutch is also pressurized and initiates the rotation of the pressure shaft 12 (point 174 in the diagram according to FIG. 7). Here the Channel A-7 in the pneumatic control valve 92 is released every time a type key has been pressed and the selector rail 99 is actuated accordingly.

With the start of the rotation of the pressure shaft 12 , the actuation of the drive plate 31 by the cam disk 51, as indicated by position 175 , also begins. At 176, according to the contour of the cam disk 51, the advance of the drive plate 31 is interrupted, but at this point in time the bolt 59 and the step stop 38 have already ended their clockwise pivoting movements. Since the Ilasso des Rio

Docket LE 969 040 209822/0463

BA ORIGINAL

If 59 is significantly less than that of the step stop 38, the bolt 59 reaches its end position earlier than the Step stop 38, so that it has already locked the actuated levers 60 to 63 when the pressure of the pump 90 The pulses supplied begin to decrease, as shown in FIG. 7 by 17? designated. The relevant levers 60 to 63 thus remain until the pressure shaft 12 has completed one revolution in the actuated position.

As soon as the step stop 38 has reached its end position, in which the desired stop step 39 and 49 to approach 40 or 47 is aligned and while the drive plate 31 is at a standstill after its first adjustment stroke, the mean of channels A-I to A-6 are printed. During the same phase, as can be seen from FIG. 7, the pawls 18 to 20 for single grip in the gear rack 26 and reach this position at 178 «This engaging movement is controlled by the cycle cam disk 140 via the lever 143 *

After reaching the engaged position of the switching pawls 18 to 20 the holding pawls 15 to 17 are lifted out of the holding rack by means of the arm 169 of the lever 159, and this process is, as indicated by 178, completed shortly before the cam disk 51 causes the further advance of the drive plate 31.

It should be noted that the holding pawls 15 to 17 are ready Before the end of its pivoting movement (point 179), release the holding rack 23 so that there is no connection between it and the type carrier carriage 11 when the drive plate 31 begins its new feed movement. This causes therefore that by means of the angle lever 33, the shift rack 26 is moved until the set stop step 39 on the approach 40 pushes. 7 is based on a switching movement of the switching rack 26 of nine step units.

BATH ORIGINAL

J.K -96 ■>, 040 20 9 8 2 2/0463

The drive plate 31 reaches its end position at 180, where on the cam disk 51 begins a further concentric section which has no adjusting effect on the drive plate 31, so that this comes to rest. The cycle cam disk 140 now reaches that position in which the lever 143 is released for resetting by the spring 144, so that the holding pawls 15 to 17 again engage in the old rack 23, which ends at 181. At this point in time, the switching blades 18 to 20 are lifted out of the scraper rack 26 and released these at 182 free. The tension spring 35 now pulls the switching rack 26 back into its starting position {point 184), since the drive plate 31 is released to return to its starting position by means of the spring 34 '(183). This return movement follows Via the shoulder 32 on the angle lever 33, the scraper rack 26 immediately (point 184), namely shortly after the switching pawls 18 to 2Q have finished their disengagement movement (182).

The return movement of the shaving rack 26 ends, like the curve in FIG. 7 shows, in a damped by the tension spring 35 Vibration, when the gear rack 26 reaches its "Auagangalmg". The resetting of the drive plate 31 end "* with the completion of the rotary movement of the pressure shaft 12, as indicated in" I5. With the drive plate 31 also return the handle 59 and the The step stop 38 returns to its original position, which is indicated by the contact of the nose 56 and the abutment 59a against the bend 55 is controlled, achieve demam sequence, without. 7 clearly it can be seen, the bolt 59 and the Schrlttanschlag 3 * to flatten Time their Auagangalage like the Antrtajbsipl & tt · 32. However, the return movement of the levers 60 to 63 does not end until a short time later because of their inertia.

In order to execute a return step of the type carrier base 11, a pressure pulse is fed to the bellows 42 through the line 43 by the pneumatic control valve 92, which has the same timing as the actuations of the bellows 76, 80 and 85 shown in FIG. 7.

8 2 2/0463 ^{BAD 0RIGlNAL}

-.27 -

step is the line 43 either via the channel A-14 or the Channel Ä-15 connected to output distributor 120 *. Included channel A-14 becomes effective for a one-unit backward step. If, however, a switch back step is to be carried out corresponding to the number of switch step units assigned to a character width in order to switch back to a character that has already been printed, the relevant type key is and at the same time to operate the code key 111, whereby the channel A-15 connects the line 43 with the pump 90. At the same time, according to the stipulation When the type key is pressed, the step stop 38 moves into the corresponding position, so that a downshift by the desired switching step size is triggered.

For the return of the type carrier carriage 11 to the left edge of the line, the holding pawls 15 to 17 must be removed from the holding rack 23 are excavated and at the same time the pawls 18 to 20 remain disengaged. This is done by pivoting a release lever 190 (Fig. IB) counterclockwise around the Rod 21 causes, for which purpose a bellows 192 is actuated by a line 191, the line 191 is from the control valve 92 over a pressure pulse is applied to channel A-13.

During the described pivoting movement of the release lever 90, its arm 193 takes the holding pawls 15 to 17 with it against the force of the springs 171, so that the connection of the type carrier slide 11 with the holding rack 23 is now released. This process has no effect on the ratchets 18 to 20, which are already disengaged .

With regard to the mode of operation of the bellows 192 there is the same problem as for the other bellows, in that as a result of the possibly only short pressure pulse, the disengagement of the holding pawls 15 to 17 must be maintained even after the end of the pressure pulse until the carriage return has ended. For this purpose there is a release latch which is rotatably mounted on a horizontal part 196 of the plate 22

209822/0463

BATH ORIGINAL

Arm 194, which locks the release lever 190 at a notch 197, as soon as the bellows 19 2 has adjusted it counterclockwise. This locking is effected by a spring 19 8, which is suspended on the one hand on the part 196 of the plate 22 and on the other hand on the arm 19 4 of the release latch 195, so that this is constantly is under a clockwise rotation force.

Simultaneously with the application of the bellows 19 2, another bellows for triggering a clutch for the slide return spring a pressure pulse, so that now the Carriage return is carried out to the beginning of the line. In this case, a line connection of the Platen 14 can be triggered.

A tab pawl 199 which is also rotatably mounted on the rod 21 is designed in such a way that it controls the movement of the type carrier slide in the downshift or slide return direction unhindered by sliding over the toothing during every movement is prevented in the direction of slide advance. When the slide return spring is switched off, the tab pawl prevents this 199, since it is constantly pulled into the toothing of the holding rack 23 by means of a spring 200, every movement of the Type carrier carriage 11 in the forward direction. This therefore remains in the line start position.

The holding pawls 15 to 17 are by means of the arm 19 3 of the release lever 190 held out of engagement with the holding rack 2 3, since the arm 194 of the locking bar 19 5 the release lever 190 to to the next cycle of the pressure wave 12 holds. In the course of the next cycle, the lever 159 pivots as described during of the first section of action of the cam disk 51 counterclockwise, whereby the release latch 195 against the force of the Spring 198 is pivoted counterclockwise by a horizontal finger 201 on arm 169 of lever 159, whereby he actuates an upwardly projecting lever 202 of the release latch 19 5. This lifts the arm 19 4 of the release latch 19 5 from

209822/0463

BATH ORIGINAL

Incision 197 and places it in the one shown in Fig. IB Position a so that the release lever 190 is pivoted under the action of a spring 203 clockwise around the rod 21. Consequently is the arm 193 of the release lever 190, the holding pawls 15 to 17 free, which are now through the arm 169 of the lever 159 except Engagement are held until the return movement of the lever 143 begins. This becomes the arm 194 of the release latch 195 adjusted again within a cutout 204 in the release lever 190 until it rests against the edge delimiting the cutout 204 205 bumps. When the arm 169 becomes effective to control the holding pawls 15 to 17, the same movements of the run Unlock as previously described using a printing operation.

To initiate a tabulation process, the bellows 192 is actuated to pivot the release lever 190 counterclockwise. At the same time, via the control valve 92 and a line 206, another bellows attached to the plate 22 is provided 207 a pressure pulse via the channel A-12, whereby a tab lever rotatably mounted on the rod 21 counterclockwise is pivoted, and this pivoting is via a downwardly projecting arm 209 located on the tab lever 208 at the same time transferred to the tab pawl 199 (Fig. 5). As a result of an elongated hole 210, the tab lever 208 is on the rod 21 both rotatable as well as longitudinally displaceable.

The described pivoting of the tab lever 208 and the release lever 190 have the effect that none of the holding pawls 15 to 17 is in engagement in the holding rack 23, since the release lever 190 has lifted the pawls in question and the tab pawl 199 is held out of engagement by means of the tab lever 208. The type carrier slide 11 is therefore not functionally connected to either the holding rack 23 or the switching rack 26 and can be unhindered under the action of the slide tension spring. perform the tabulation movement. With the described pivoting movement of the tab lever 208 counterclockwise

Docket LE 969 040 209822/0463

213088A

a spring 213 that an arm 211 of a tab latch 212 (Fig. IB), which is pivotably mounted on the plate 22, is set in a stop step 214 on the tab lever 208, whereby this is locked in its position and the tab pawl also after the end of the pressure pulse supplied to the bellows 207 is held out of engagement with respect to the holding rack 23.

The tabulation movement of the type carrier slide that has now been initiated 11 only ends when a tab rider 215 is detected on the tab rod 216 by a sensing pawl 217, which is in the Pivoting the tab lever 208 counterclockwise into its effective position to the tab riders 215 comes. The sensing latch for tabulation is rotatably mounted on the tab lever 208 by means of a collar screw 218 and is under the action of a counterclockwise rotating spring 219 so that a bend 220 rests against the edge of the tab lever 208. However, the spring 219 allows the sensing pawl 217 to rotate in the clock in a clockwise direction, if this occurs when the type carrier carriage 11 is switched back or when the carriage returns with its rear Edge of the set tab riders 215 looks past.

If, during a tabulation process, the sensing pawl 217 hits a set tab tab 215, the tab lever 208 becomes a consequence shifted the guide through the elongated hole 210 in the downshift direction, namely as far as the length of the elongated hole 210 allows. Here, the arm 211 of the tab latch 212 slides out of the stop step 214 of the tab lever 208, as a result of which the spring 213 pivots the tab latch 212 clockwise until a lug 221 on the tab latch 212 at a bend 222 of the plate 22 comes to the fore. As a result, the pivoting movement of the tab latch 212 is limited so that its arm 211 is at the Resetting the tab lever 208 in its starting position in its Area of effect is located. During the previously described sliding of the arm 211 from the stop stage 214 and in the course of Pivoting movement, caused by the spring 213, pulls a spring 223 (FIG. 5) the tab lever 208 in a clockwise direction around the rod

Docket LE 969 040 2 0 9 8 2 2/0463

21 that the arm 209 moves away from the tab pawl 199. Now the Spring 22 also swivel the tab pawl 199 clockwise, so that it engages in the holding rack 23 again .

Docket LE 969 040 209822/0463

Claims (10)

- 32 - PATENT CLAIMS Switching device for the type carrier carriage or writing carriage of a power-driven typewriter, with two parallel racks mounted in the machine frame, one stationary, with a holding pawl interacting Haite rack and a longitudinally displaceable, gear rack cooperating with a pawl, which has a pushing movement for each switching step is issued, characterized in that one on both sides with a plurality of stop steps (39, 49) provided step stop (38) protruding into an incision (48) in the shift rack (26) is provided, its cyclical setting movement in accordance with the switching step size assigned to the typed character is controlled by the keyboard that for optional longitudinal displacement of the gear rack (26) in the ballast or in the downshift direction a cyclically operated drive plate (31) which can be switched over in two effective positions provided with a constant stroke and each via an intermediate member (33, 36) and associated with the two switching directions a tension spring (35) is effective on the scraper rack (26), and that a cyclically switched cam drive (140 to 143) for synchronously lifting the holding pawls (15 to 17) and releasing the switching pawls (18 to 20), respectively for the duration of the stepping movement - is provided. 2. Apparatus according to claim 1, characterized in that the drive plate (31) is operatively connected to a cyclically switched cam drive (51 to 53) and, depending on its active position, is coupled to one of two angle levers (33, 36) pivoted to one another in mirror-inverted fashion is, v / hich via which the two angle levers (33 _f 36) coupling together the tension spring (35) and the other angle lever as well as a mounted on said indexing rack (26) bolt (37 or 46) Docket Ui 969 040 2 0 9 8 2 2/0463 _BAD the indexing rack is effective. 3. Apparatus according to claim 2, characterized / that for resetting the indexing rack (26) this with the angle levers (33, 36) cooperating bolts (37, 46) fastened and on'einer at right angles to the Schrxttschaltzahnstange (26) extending straight lines are arranged, which through the pivot point (screw 34) of the Angle lever (33, 36) runs. 4. Device according to claims 1 and 2, characterized in that that for clock-synchronized setting of the pivotably mounted step stop (38) on the drive plate (31) an angled portion (55) which acts as a driving force on a nose (56) of the crotch stop (38) is arranged. 5. Apparatus according to claim 1, characterized in that for switching the drive plate (31) in the downshift direction the gearshift rack (26) a downshift lever (41) which adjusts the drive plate (31) controlling coding key (111) is provided. 6. Device according to claims 1 and 4, characterized in that that to limit the adjustment movement of the step stop in accordance with the keyed characters associated switching step size, a plurality of actuating or intermediate levers (60 to 63) are provided, the position of which can be controlled in combination from the keyboard. 7. Apparatus according to claim 6, characterized in that to control the interaction between the actuation or. Intermediate levers (60 to 63) and the step stop (38) a transversely displaceable crosspiece (64), which is also controlled by the keyboard, is arranged on this. 8. Device according to claims 1 and 6, characterized 209822/0463 Docket LE 969 040 by a bolt that can be actuated through the angled portion (55) (59) with a plurality of fingers (83) or lugs (83b, 88) for locking the setting position of the actuation or Intermediate lever (60 to 63) until the end of the cycle. 9. Device according to claims 1 and 4 to 8, characterized in that for actuation of the keyboard controlled actuators (41, 60 to 64) pneumatically operated drive elements (42, 76, 80, 85) arranged are. 10. Device according to claims 1 and 4 to 9, characterized by a keyboard controlled pneumatic control valve (92) with a plurality of selector rails (93 to 99) a coding rail (109) and a switching rail (110) optionally to a pneumatic one Output lines that can be connected to the pressure system (43, 75, 79, 84, 191, 206). Docket le 969 040 209822/0463