DE1230117B - Program switch - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

GO5b

G05f; H01h
German class: 21c-46/34

Number: 1230 117

File number: S 59293 VIII b / 21 c

Filing date: August 5, 1958

Opening day: December 8, 1966

The present invention relates to a program switch with a full umlaut the sequence and duration of the switching processes determining the control shaft, its drive on certain angular distances Can be switched to overdrive by rotating switching means, the activation of which can be preselected is.

In a known program switch of this type, the control shaft carries a disk made of insulating material, which is covered with individual conductive segments at different distances from the center and where a brush is assigned to each conductive segment. About each brush and the conductive one assigned to it Segment leads a circuit which, when closed, drives the control shaft in overdrive causes. Each brush is preceded by a normally closed switch that can be activated by pressing a button can be opened. It is thus possible to deactivate a brush by pressing one button make, in which case the control shaft runs at normal speed when the switched off Brush is located on the segment assigned to it. Each segment is assigned to a specific operation, and it is thus possible to preselect a specific individual operation by pressing one key. Due to the length of the segment assigned to each operation, the duration of the Operation given. Apart from the fact that every desired program through conscious preselection must be built up for each individual operation, the main disadvantage is that the duration of each individual operation is fixed, which means that each operation is individually adapted to a specific one items to be treated, especially on different types of laundry in a fully automatic Washing machine, is impossible.

It is also possible to preselect the duration of each individual operation using special setting means, However, this in turn leads to a considerable expenditure on switching means and the necessity leads to consciously preselect the duration of each individual operation.

Finally, there is also the possibility of several individual operations by a single one Selecting the dialing process, but this does not eliminate the main disadvantage mentioned, that the duration the individual operations is unchangeable.

A correspondingly working program switch is also known in which the control shaft a single brush rotates along several stationary segments. As long as the brush is live Finds segments, the control shaft runs in the program switch

Applicant:

Saia A. G., Murten (Switzerland)

Representative:

Dr.-Ing. A. Schulze, patent attorney,

Berlin 31, Jenaer Str. 13-14

Named as inventor:

Artur Weber, Muri bei Bern (Switzerland)

Claimed priority:

Switzerland of August 14, 1957 (49 422),

of September 17, 1957 (50 611),
dated November 21, 1957 (52 914)

Overdrive through. Individual segments can now be arbitrarily de-energized using button-controlled off switches be made so that the control shaft in the area of these segments at normal speed runs and controls a specific operation of the program. This results in those already mentioned Disadvantages, namely that the desired program parts by arbitrarily pressing several keys must be selected and, above all, that the duration of the selectable program parts cannot be changed is given.

It is also known to provide cam disks on the control shaft, each associated with one Operate a switch in a circuit designed to change the running speed.

In this case, however, all control means used to influence the running speed are always effective, so that the overall character of the program cannot be fundamentally changed. It is only possible by adjusting the effectiveness of the individual control means, the duration of individual program phases in to change certain limits, but one-far-reaching Change in turn requires several deliberate preselection operations.

The invention is now based on the object, by a single selection process in the broadest To be able to preselect any number of different special programs. This possibility is particularly

609 730/299

ders of utmost importance for automatic washing machines where the housewife without cumbersome Considerations and setting procedures for a washing program that is adapted in every respect to the laundry to be cleaned should be able to choose. They are controllable by punch cards or cam cards Program switch known in which by replacing a punch card, cam card or cam disk with a large number of control tracks, predefined programs of the most varied of character and any duration can be controlled. However, the program card controls also have considerable Disadvantages on. Reliable control of the circuits by the card requires quite a bit Expenditure. The multi-lane card itself is an expensive item to select and deploy The map requires skill and attention.

The program switch according to the invention is now characterized in that for each of one normal program controlled with complete rotation of the control shaft at normal speed Special program to be controlled by arbitrary reductions a single predetermined control means it is provided that the elements required to determine all overdrive phases and their duration are provided . and the effectiveness of which can be selected by a single process. So it is the possibility given, from the normal program any section in any duration for to take over a certain special program or to skip it ineffective by overdrive, so that by a clear, simple preselection among the most varied of special programs the most suitable can be selected. In particular, there is the option of all parts of the program switch to be permanently installed and the effectiveness of a control means assigned to a special program, z. B. a program cam to select by pressing a key switch. Each Replacing control elements, as is necessary with punch card control, can thus be omitted, although it is in itself also possible to use the individual control means, e.g. B. cams, interchangeable to arrange.

The drawing shows two exemplary embodiments and an embodiment variant of the invention Program switch shown.

1 shows the electrical diagram of a first program switch according to the invention;

Fig. 2 shows an electrical partial diagram of a Design variant;

F i g. 3 shows the dial pad in plan view;

F i g. 4 shows a section along line IV-IV in FIG. 3;

FIG. 5 shows a section along line V-V in FIG. 4, and

Fig. 6 is an operation of the program switch illustrative timing diagram;

7 to 10 show a second embodiment of the program switch.

The in the F i g. 1 and 3 to 5 has a program switch accommodated in a housing 1 Keypad of known type with keypad 2 to 6. The shafts of the dial pad 2 to 5 act on the operating lever 7 of two-pole switches 8 on the cover of the housing 1 are mounted. The selection keys 2 to 4 can be accessed by means of tabs 9 in a manner known per se a spring-loaded, downwardly pivotable locking bar 10, each Button triggered when another is actuated and returned to the off position by a spring 11 will. The key 5 has core locking tabs 9, so that the one assigned to it, shown in FIG. 1 with 5 'designated switch is operated only as long as the button 5 is pressed. The button 6 is pressed

ίο no switch and is only used to trigger the buttons 2 to 4. Between the shafts of the buttons 2, 3, 4 and 5, a locking disc 12 is arranged. The disks 12 are held in openings 13 so as to be displaceable transversely to the key shafts, and the ones shown in FIG. 3 disks 12 lying on the left of one of the key shafts are shifted to the left when the relevant key shaft is pressed in, with the result that the key S is locked against actuation. It should therefore be explained in more detail later

ao avoided that the key 5 is pressed simultaneously with one of the program keys 2 to 4.

A first camshaft 14 is provided in the program switch, which is driven by a synchronous motor 15 can be driven quickly with, for example, one revolution in 10 seconds. On the Camshaft 14 sits a locking gear 16, in which a spring-loaded locking pin 17 engages and the respective The working position of the camshaft 14 is clearly determined. A control cam ratchet wheel is also located on the camshaft 14 18 is provided, which actuates a step switch 19. The camshaft 14 has furthermore, two overdrive cam disks 20 and 21, each of which has an overdrive switch 22 and 23, respectively steer. The overdrive switch 22 controlled by the cam disk 20 is during the phase shown in FIG. 6 denoted by dashes after the reference number 22 The time of the full working rotation of the camshaft 14 extending over 90 minutes is closed. The overdrive switch 23 controlled by the cam disk 21 is also in FIG F i g. 6 at reference number 23 indicated by dashes parts of the full rotation of the camshaft 14 closed. The camshaft 14 has program cam disks 24 to 28, which are in control circuits lying switches 29 to 33 during the in F i g. 6 times indicated by dashes closed keep. The control circuits are connected to terminals 34 to which the control circuits of the actual working machine can be connected.

The program switch has a second, from a second synchronous motor 35 with a speed for example, one revolution per minute driven camshaft 36. Owns the same a first cam disk 37, which is a pulse switch located in the circuit of the first synchronous motor 15 38 controls. In addition, two cam disks 39 and 40 are provided on the camshaft 36, the two switches 41 and 42 alternately each during one revolution of the camshaft 36 open or close twice. The switches 41 and 42 are connected in series with the switch 29 and are led to special connection terminals 34.

The program switch finally has a relay 43, which has a break contact 44 and a Working contact 45 has. The winding of the relay 43 can either be via the switch 5 'or the switches 22 and 3 'or switches 23 and 4' and above

a line 46 can be energized. Via the line 46 and the normally open contact 45 of the relay 43 can also the synchronous motor 15 are fed.

The selector switches 2 'to 4' each have a normally open contact via which the switches 19, 22, 23 and 38 and the synchronous motor 35 can be permanently connected to the supply network. Via these normally open contacts shown on the left in FIG. 1, the switches 2 'to 4' and the normally closed contact 44 of the relay 43, the control switches 29 to 33 can also be fed.

On the cam disk 28, a lateral cam 47 is attached, which in the axial direction acts on a switch-off lever 48 when the camshaft 14 is in the starting position shown in FIG arrives. The in F i g. 1 schematically illustrated lever 48 is according to FIG. 4 clockwise pivots and triggers the locking rail 10, so that all dial buttons in their initial position pass over.

The program switch shown in FIGS. 1 and 3 to 5 works as follows:

If the selection button 2 is pressed and thus the switch 2 'is closed, the synchronous motor is activated 35 fed in the indicated way and drives the camshaft 36 at a constant speed. The switch 38 is periodically, for. B. every minute, brought into the illustrated, closed position, so that the synchronous motor 15 receives power and begins to run. It is now also the switch 19 is closed by the cam disk 18 and continues to feed the synchronous motor 15, even if the switch 38 is opened again after a short time. Is the camshaft 14 through the synchronous motor 15 has been rotated by one switching step, so the switch 19 is again opened and thus the synchronous motor 15 switched off. The locking gear 16,17 ensures that the Camshaft 14 returns to a clearly defined switching position after each advance, so that the switches actuated by the camshaft 14 are always clearly controlled. In this Way, the camshaft 14 gradually runs through completely in, for example, 90 minutes, the individual contacts 29 to 33 during the in F i g. 6 indicated times are closed and in known Control the automatic sequence of a 90-minute normal washing program. The switches 41 and 42 are used, for. B. to periodically reverse the drive motor of the washing drum.

If the selector switch 3 'is closed instead of the selector switch 2' by pressing the selector button 3, so is about the in F i g. 1 left working contact of the selector switch 3 'of the synchronous motor 35 also permanently connected to the network, so that the switch 38 in the described Wise periodic incremental pulses to the synchronous motor 15 emits. It is now about to Start of the program sequence of the overdrive switch 22 closed by the overdrive cam disk 20, so that over the overdrive switch 22, the second (right) working contact of the selector switch 3 'and energized the relay 43 via the line 46, the step switch 19 bypassed and the synchronous motor 15 is continuously fed. As mentioned, the relay 43 switches the control contacts 29 to 33 from the network, and the synchronous motor 15 drives the camshaft 14 in overdrive until the Switch 22 is opened again by the cam 20 after a relatively short time. In order to the relay 43 and the synchronous motor 15 are de-energized and the camshaft 14 is switched is again controlled step by step by the synchronous motor 35 or the pulse switch 38. Due to the described overdrive of the camshaft 14, the first 10 minutes of the Run through the program in a very short time of a few seconds with ineffective control circuits, what by the first line to the number 22 in F i g. 6 is indicated. The cam 20 is then another overdrive between the 30th and 40th minute of the normal program is controlled so that the entire program can be run through in just 70 minutes while holding down selection button 3, whereby for the Washing operation to be carried out not required or undesired sections of the work program can simply be skipped.

If the selection button 4 is actuated, the mode of operation of the program switch is basically the same as with switched on switch 3 ', only that the overdrives of the camshaft 14 by the Switch 23 or the cam 21 are controlled. The in F i g. 6 re item 23 Skipped parts of the normal program indicated in black lines, so that z. B. a very short wash program is obtained for a specific type of laundry. At the end of the program the depressed selection button is activated in the manner described by the switch-off cam 47 and the lever 48 triggered, with which the entire program switch is switched off and in its starting position stop.

With the program switch described, three different programs are possible. The number of Programs can, however, be multiplied in a very simple manner by the fact that per additional program one further cam disk each corresponding to the cam disks 20, 21, another control switch corresponding to switches 22 and 23 and a selection key corresponding to keys 3 and 4 will.

The switching off of the program switch at the end of the program can also be done electrically, e.g. B. done by a cam-controlled switch 49, which is indicated by the dashed lines Circuit 50 interrupts the connection between the network and the selector switches 2 'to 5'. Included would of course the in F i g. 1, the connection 49 'shown in solid lines is omitted.

By pressing button 5, the synchronous motor 15 can be arbitrarily connected to the network, to shift the camshaft 14 forward in overdrive. It also exists without further ado the ability to arbitrarily modify a running program by removing any part of the program through the Cam disks 24 to 28 specified normal program in high speed and ineffective Control circuits are skipped. Before pressing key 5, however, other keys must be used to be triggered.

Instead of a synchronous motor 15, a stepping relay can also be used to advance the camshaft 14 used, which is fed via a self-breaker when the overdrive is switched on can be and then as an automatic step

Switching relay works. A corresponding circuit is in Fig. 2, in which the same parts are provided with the same reference numerals as in FIG 1. The step switching relay 51 is either via the contact 38 or via its own break contact 52 fed via line 46. The step switching relay 51 acts on one in FIG. 2 schematically Pawl 53 shown, which allows the camshaft 14 to be advanced step by step via a stepping wheel 54. If the switch 38 is closed, the stepping relay 51 is energized and switches the camshaft 14 by means of its pawl 53 by one step. Receives line 46 via one of the switches 22 or 23 or 3 'or 4' current in the manner described, the relay 51 is also energized and advances the camshaft 14 by one step. The switch 52 is opened so that the Relay 51 drops out again immediately and is then re-energized and the camshaft 14 in rapid succession is advanced until the line 46 is separated from the network by the cam 20 or 21 and thus the overdrive is ended. The relay 51 also has a switch 44 which is e.g. can be designed with a drop-out delay that it remains permanently open as long as the line 46 carries voltage.

In a similar circuit, the relay 43 according to FIG. 1 with a stepping relay 51 according to FIG. 2, whereby the switch 44 would of course remain on the relay 43, while the stepping relay has its self-interrupter 52 from a normally open contact of the relay 43 would be fed. Either in the last-mentioned circuits or also in that mentioned in FIG Circuit, it can be advantageous to arrange a second break contact on the relay 43, which in Series is connected to the synchronous motor 35, so that the synchronous motor 35 and the camshaft 36 always be stopped as soon as the relay 43 is actuated.

The position of the cam discs 39 and 40 is advantageously chosen so that in the illustrated The rest position of the camshaft 36 or, in the switching moment of the camshaft 14, both switches 41 and 42 are open are.

You could also get by without a relay if the cam-controlled switches 22 and 23 with suitable break contacts would be equipped, through which the control circuits during switching the camshaft 14 would be separated in overdrive.

A second embodiment is shown in FIGS. 7 to 10 shown in which corresponding parts are designated the same as in FIGS. 1 to 6.

The in F i g. 7 program switch shown schematically has a camshaft 14 with a number of control cam disks, of which z. B. the cams 24, 25 and 26 are shown. It However, significantly more control cam disks can be provided, which are controlled via switches 29, 30 and 31 Control machine parts M according to a specified normal program. A sits on the camshaft 14 Step switch wheel 54, which is stepped by a step switch relay 51 via a step switch pawl 43 can be driven. A cam disk 28 'is also attached to the camshaft 14, which is shown in FIG the illustrated rest position of the camshaft 14 holds an off switch 49 open. In series with the off switch 49, a clutch switch 60 is arranged, which is always open in the manner described later is when the camshaft 14 is disengaged from the indexing wheel 54.

The program switch has a synchronous motor

35 on which a camshaft 36 z. B. drives at one revolution per minute. On the camshaft 36 sits a cam disk 37, which has a pulse switch 38 during normal operation closes briefly every minute. On the camshaft

36 or on a separate one driven by the camshaft 36 via a gearbox at a higher speed Shaft or hub is a cam disk 61 is arranged, which a during normal operation Pulse switch 61 closes briefly, for example 120 times per minute. The switches 38 and 62 skid in Series connected to stepping relay 51. The moving contact of the pulse switch 38, the synchronous motor 35 and the movable contact 63 of a changeover switch 64 are on via switches 49 and 60 connected to one pole of a power source 65.

The movable contact of the switch 62 is connected to the one fixed contact 66 of the changeover switch 64. The other fixed contact 67 of the changeover switch 64 monitors the supply of power to all Control switches 29 to 31.

The F i g. 8 to 10 show the mechanical structure of the program switch. The stepping wheel 54 is rotatably mounted on a shaft part 14 'by means of its sleeve 54'. On the sleeve 54 'is also a Indexing lever 68, which carries the indexing pawl 53, can be pivoted. In the rest position shown the indexing pawl 53 is controlled by a spring 70 in FIG. 9 pulled to the left and between the stepping wheel and a pin 71 wedged so that it secures the indexing wheel against forward rotation.

The indexing wheel is also engaged by a pawl 72 which prevents any reverse rotation of the indexing wheel prevented. The actuating roller 73 of a rocker switch 74 acts on the indexing lever 68, which acts on a pin 75 is pivotally mounted and from a roller 76 of the armature 77 of the stepping relay 51 is pivoted counterclockwise when the stepping relay 51 is energized.

The tapered end of the camshaft 14 shown in Fig. 10 engages in a bore 78 of the axially displaceable shaft part 14 '. On this shaft part 14 ', a clutch disc 79 is attached, which has a ring of coupling holes 80 into which a coupling pin 81 of the indexing wheel 54 can intervene. A coupling pin 82, which is axially displaceable, is attached to the coupling disc 79 through a hole in the cam 28 '.

On the section lying between an inner housing wall 83 and an outer housing wall 84 of the shaft part 14 'sits a bushing 85, on the flange of which has two pins 86 and 87 different Diameter are arranged asymmetrically. An opening 88 is provided in the outer housing wall 84, through which an overdrive cam disc 89 is inserted over the sleeve 85 can. The cam disk 89 is different in correspondence with the pins 86 and 87 with holes 86 'and 87', respectively Provided diameter, in which the pins 86 and 87 engage in the manner shown in FIG can, so that the cam disk 89 only in a certain angular position with respect to the shaft part 14 'or with respect to the camshaft 14 can be used. The cam 89 is

Claims (1)

9 10 is permanently controlled by pins 90 with an indicator disc 91. This means that all control contacts 29 bound. The display disc 91 has a larger to 31 and any other not shown, Diameter than the cam disc 89 and comparative contacts without current, with which the working covers the opening 88 of the front housing wall 84, the machine is in the assumed working position when an overdrive cam 89 remains in that of FIG. At the same time, the moving contact now receives F i g. 10 operating position shown in the program of the pulse switch 62 via the contact 66 of the switch is inserted. In this position, the changeover switches are 64 current. The stepping relay 51 Indicator disc 91 and the overdrive cam disc are now activated by the fast-working impulse 89 held by an operating button 92, switch 62 controlled so that the camshaft 14 at which with the shaft part 14 'releasably screwed io ineffective control circuits in rapid traverse each is. On the display disc 91, the program is switched forward by one step half a second recorded, which is loaded when inserting the until after a short time the switch 64 through the corresponding indicator disk 91 connected high-speed high-speed cam disk 89 back into the shown gear cam disk 89 is reversed position set by the program switch. Thus the im- is controlled. 15 pulse switch 62 de-energized while the control switch As shown in Fig. 10, the movable contact 63 29 to 31 is energized again. The program of the changeover switch 64 at the free end with a sequence now continues normally, with the camshaft 14 inclined 93 provided, in the manner explained later by the pulse switch 38 every minute by one replacing the overdrive cam 89 is advanced. So it will be all parts enables. The clutch disc 79 acts in the normal program for which the overdrive is open the switch 60 that the same is open when the cam disc 89 has incisions, when inactive Pass through the clutch disc 79 in rapid traverse along the control circuits in the manner shown, is decoupled from the indexing wheel 54. so that the actual work program just consists of The program switch is in its end position the intermediate parts of the normal prooder Rest position shown, in which the feed is composed of 25 grams, for which parts the Schnelldes Program switch on the off switch 49 has lower cam disc 89 elevations. Has the broke is. If the program switch for camshaft 14 is now to perform a full turn, Control of a program is put into operation, the main switch 49 is activated by the cam ends, so the shaft part 14 'is opened again in the disk 28' in FIG. 10 and thus the whole The position shown shifted, whereby the clutch 30 program switch is de-energized. So he stays Disk 79 and thus also the camshaft 14 are from in this end position and can only through the Stepping wheel 54 is uncoupled. At the same time, the above-mentioned measures are put back into operation Main circuit of the program switch to be set. Switch 60 interrupted. The one from the indexing wheel should be further processing after another uncoupled camshaft 14 is now z. If, for example, a program is to be carried out, the high-speed cam step can be used brought into its initial position, the disc 89 to be replaced, for what purpose Switch 49 is closed. In the initial position, the button 92 is released and the overdrive is used Now the camshaft 14 by pulling out the cam disc 89 and the Andes connected therewith Shaft part 14 'and the clutch disc 79 indicating disc 91 removed and Erwieder by another coupled with the indexing wheel 54, with which 40 sets and then the button 92 is set again the clutch switch 60 is also closed again. The program switch is now ready for use will. The synchronous motor 35 is thus prepared and controlled via the control of the new program Switches 60 and 49 power and starts to run. can be started in the manner mentioned. At the At the same time, the control switches 29 to 31 are activated by inserting the new high-speed cam disk 89 the switches 60, 49 and 64 are fed, so that certain 45 hits the same with its inner edge on the machine parts M are switched on, provided that the slope 93 of the changeover contact 63 and is provided in the activated program. After pushing it outwards without it in axial direction Minute running time of the synchronous motor 35 will load and possibly bend it, the switch 38 is closed briefly, which means that the program switch can of course also be used for Step solenoid 51 receives a current pulse and uses 50 control of the full normal program the indexing lever 68 via the rocker 74 in FIG. 9, if a blind disk is used, the pivoted to the right. The indexing pawl 53 is designed like an overdrive cam disk 89 is one tooth on the indexing wheel 54, but has no notches at all, so reset, and as soon as the stepping relay 51 that the camshaft 14 is never advanced in rapid traverse becomes de-energized, all parts go under the effect 55 becomes. In this case it is also possible to use the Proder Spring 70 back to the gram shown in Fig. 9 arbitrarily by changing the cam position back, the indexing wheel 54 and the shaft 14 being disengaged from the indexing wheel 54 and camshaft 14 coupled therewith by one step with the omission of part of the normal program is advanced and turned by hand to the place by the stepping pawl, by welselbst latched in the new position. The program should continue to run again rather than 60, are through the cams 24 to 26 or similar cam disks, not shown, claims:
possibly certain control circuits for control of the work program open or closed. In the 1st program switch with a In this way, the camshaft 14 is now the sequence and duration of every 65 continuous revolution Minute, shifted by one step, until after switching operations determining control shaft, their for a certain time, contact 63 of the drive changeover switch to high-speed 64 can be bypassed by the overdrive cam disc 89 by rotating switching e / \ n ninlnnn means, the effectiveness of which can be preselected, characterized in that for each controlled by one that is controlled when the control shaft rotates completely at normal speed Normal program through arbitrary reductions to be controlled special program a single given Control means (20, 21) is provided which are used to determine all overdrive phases and its duration contains necessary elements and its entry into force by a single Process is selectable. 2. Program switch according to claim 1, characterized in that each as control means an overdrive cam (20 or 21 or 89) is provided, which on one in one Overdrive control circuit lying switch (22 or 23 or 64) acts. 3. Program switch according to claim 2, characterized in that each overdrive control circuit by a selector switch (3 'or 4'), e.g. B. a key switch can be switched on. 4. Program switch according to one of claims 1 to 3, characterized in that on a plurality of control means, e.g. cam disks (20, 21), are fixedly arranged on the control shaft (14). 5. Program switch according to claims 2 and 3, characterized in that each Overdrive switch (22, 23) and each selector switch (3 ', 4') has working contacts. 6. Program switch according to claim 2, characterized in that the overdrive cam disk (89) can be removably attached to one end of the control shaft (14). 7. Program switch according to claim 6, characterized in that the overdrive cam disk by guide means (holes 86 ', 87' and pins 86, 87) only in a specific one Angular position to the camshaft can be used. 8. Program switch according to claim 6 or Ί, characterized in that the Schnellgangnok kenscheiben (89) with a spaced-apart display disc (91) connected sine on which the special program is shown 9. Program switch according to claim 8, characterized in that the housing (84) de Program switch has an opening (88) located axially to the control shaft (14), durd which the overdrive cam disc (89) can pass through, while the indicator disc (91) di Covering opening (88) from the outside. 10. Program switch according to one of the preceding claims, characterized by durd a pulse generator (35 to 37, 61, 62), the optionally a slow and a rapid sequence of voi Can emit pulses and drive the control shaft (14) via a step relay (51). 11. Program switch according to claim 10, characterized in that the pulse generator ii slower and faster sequence periodically closing switches (62 and 38), of wel Chen the slowly closing scarf ter (38) directly between one of the controls shaft monitored limit switch (49) and since the stepping relay (51) is switched, while « the switch that closes in rapid succession (62 in series with one of the overdrive cams disc (89) closable switch (63, 66) un <the stepping relay (51) is switched. Considered publications:
German Auslegeschrift H 22282VIII b / 21c (announced on December 6, 1956); U.S. Patent Nos. 2,138,243, 2,391,718;
Journal: Elektrotechnik, 1955, No. 37, p. 321 For this purpose 2 sheets of drawings 609 730/299 11.66 © Bundesdruckerei Berlin