DE1092815B - Device for motorized setting of an object in discrete angular positions, each of which corresponds to a command, measured value or the like given as a combination of the components of a dual code - Google Patents

Description

GERMAN

For motorized adjustment of an object in discrete angular positions, each as a combination the components of a dual code correspond to a given command, measured value or the like, devices are known in which a rotating body is coupled to the object on which all occurring dual combinations are stored scannable and with each revolution of the rotating body scanned one after the other and compared with the dual combination specified by the command will; Furthermore, switching means (relays) are provided which shut down the setting motor as soon as one another matching (or in some other specific way assigned) dual combinations for Comparison come.

In order to achieve the highest possible working speed with such a device, it is desirable that the rotating body (and thus the object to be adjusted) when changing commands from the the previously assumed angular position always on the shortest path, d. H. so by putting aside the smallest angle of rotation, reaches the new angular position.

Corresponding directional control of the setting motor is achieved according to the invention in that the components of some specific codes selected from the total number of codes of the code used, according to their combinations, additionally apply the current coils of a two- or multi-coil ratio current instrument of motor-like design in a known manner via relays to fixed voltages that are suitable for setting the ratio current instrument in a small number of discrete, preferably evenly distributed angular positions over 360 °, each of these angular positions being assigned an angular adjustment range of the rotary body in which all the angular settings of the rotary body that correspond exactly to the respective complete dual combinations lie, and that between the rotor shaft of the ratio current instrument and the drive shaft of the rotating body a comparison contact device is arranged, which de in opposite directions of rotation r responds to both shafts and, if necessary, reverses the direction of rotation of the setting motor via a relay. For this purpose, the dual combinations are to be stored on the rotating body in such a distribution that all dual combinations lying within such an angle setting range match those dual components that are selected from the commands for setting the ratio current instrument in the angular position assigned to this area.
The invention makes use of the per se be device for motorized adjustment of an object in discrete angular positions, each of which corresponds to a command, measured value or the like given as a combination of the components of a dual code

Applicant:

HAGENUK

formerly Neufeldt & Kuhnke G.m.b.H., Kiel, Westring 431-451

Dipl.-Ing. Hermann Saacke, Kiel-Kronshagen, has been named as the inventor

known property of a ratio current instrument of motor-like design when changing the The voltages applied to the coils adjust themselves to the new angular position always on the shortest path. Since here only the direction of rotation of the setting movement of the ratio current instrument through the Comparison contact device must be determined, it is sufficient to switch the ratio current instrument into some a few angular positions, e.g. B. four, six or eight, to be able to bring what is known to be proportionate few contacts can be achieved.

A circuit arrangement is already known for devices of the type presupposed at the outset, with the same purpose is achieved as the invention. In the known circuit, the Direction of rotation control of the setting motor for the rotating body directly through the contacts on the Relays that compare the actual value of the setting of the rotating body with the setpoint value. For this purpose, two contact chains are formed on these relay contacts, and the direction of rotation of the Adjustment motor depends on which of the two contact chains is closed, which in turn depends on it depends on which of the actual value relays and which of the setpoint relays have responded.

However, this known circuit has the disadvantage that the number of Relay contacts is very large; with a 5-digit code e.g. B. lie in each of the two contact chains twelve relay contacts in series. This number

009 647/66

ϊ 092815

also increases with each increase in the number of codes - i.e. when the Number of discrete settings of the rotating body - for each additional code position by two. A bigger one The number of relay contacts connected in series is known to impair the operational safety of a Circuit arrangement. As can be seen from the exemplary embodiment described below, lie In the device according to the invention, there are also relay contacts connected in series in one Circuit, but their number only depends on how many discrete angular positions the ratio current instrument is used to should be set. To achieve eight discrete angular positions, for example only a maximum of three relay contacts in series are required. The number of times for the ratio current instrument required discrete angular positions is compared with the number of achievable discrete angular settings of the rotating body low, above all it does not need to be increased when the number of codes is increased.

The figures show an exemplary embodiment for the in a simplified and schematic form Subject of the invention.

In Fig. 1, a turntable D is shown as a rotating body, on which the thirty-two possible combinations of an S-digit dual code in the form of radially arranged groups of open and closed windows are stored at regular angular intervals. The closed windows are indicated by the black filled circles. The window groups are distributed in such a way that four neighboring groups in codes 1, 2 and 3 always match, so that the turntable can be viewed as divided into eight 45 ° sectors I ... VIII.

In Fig. 2, the turntable D is drawn laterally and partially in section. It is to be thought of as being coupled to the object to be adjusted (not shown) and is driven by the adjusting motor M via a reduction gear UG. The position of the turntable D is scanned photoelectrically by means of the photocells Z ₁ ... Z ₅ and the common light source L, which face each other on both sides of the turntable D. In the position shown for the turntable, all of the photocells are unexposed. K ₁ ... K ₅ are relays for receiving incoming commands. A ₁ ... A ₅ are sensing relays that receive power when the photocells are illuminated. All relay contacts are shown in the rest position. Each of the contacts a _t ... a _{5 of} the ^ relays is in an alternating circuit with one of the contacts ^ ₁₁ ... k _{51 of the Ä relays.} As long as the two contacts belonging to the changeover circuit, i.e. O ₁ - ^ ₁₁ , a ₂ -k ₂₁ etc., are either both in the rest position or both in the working position in each code position (match), the switch-on relay E for the setting motor M is de-energized . If, however, a new command that does not match the window combination scanned on the turntable arrives, one of the A and ΛΓ relays belonging to this code position will be one of its working position and the other of its rest position in at least one code position. The a and ^ contacts of these relays then close the circuit for the -Ε relay, this picks up, and its contact e _x puts the setting motor M on voltage. This now drives the turntable D until the photocells Z ₁ . . .Z ₅ faces a window combination that matches the command. As soon as this window combination is scanned, the contacts of the contact pairs G ₁ - ^ ₁₁ ... a ₅ -k ₅₁ again assume corresponding positions, so that the circuit of the Ε relay is interrupted again and the motor M is switched off.

Of each command relay of the first three codes, that is K _1, K ₂ and K _v three additional contacts are operated, namely, the relay K _1, the contacts k _12, k _IS, k _u, from the relay _K2, the contacts k _22, k _2s , k _2l and from relay K _s the contacts k ₃₂ , k. _iV k _M. These

ίο Contacts are interconnected in such a way that they apply the voltages + U, - U and 0 of the two voltage sources U ₁ and _{U 2} according to the eight possible sub- commands in as many different combinations to the fixed cross-coils χ and 3 'of the ratio current instrument VJ , so that Its rotor NS sets itself accordingly in eight different discrete angular positions, each spaced apart by the angular amount of a sector of the turntable, each of which is assigned to that sector on the turntable whose window combinations contain the given partial command. To control the direction of the setting motor M , a comparison contact device NK is provided between the rotor shaft of the ratio current instrument and the drive shaft of the rotating body, one contact arm r of which sits on the rotor shaft RW and the other contact arm d of which sits on the shaft DW of the turntable D. As soon as the two contact arms d and r touch, voltage is applied to a control relay 5 "which, by actuating its changeover contact S _1, reverses the normal direction of rotation of the motor M by switching the field winding FW ₁ off and the reversed field winding FW ₂ on . So that the reversed direction of rotation of the motor M is maintained until the new turntable position is reached, even if the contact arms d and r only touch each other temporarily, a self-holding contact S _{9 is} connected in parallel to the contact arms for the relay S. The self-holding circuit of the 5th When the setting motor is switched off, the "relay is disconnected again when it drops out through the contact e _{2 of} the £ relay located in this relay circuit. Since the same running direction is always specified when the adjusting motor is switched on, the simple, one-way contact device shown is sufficient for reversing the direction.

The sequence of action of the arrangement described above is as follows:

When a new command arrives, the switch-on relay E receives power in the manner already described and sets the setting motor M to run. At the same time, the partial command derived from codes 1, 2 and 3 is sent to the ratio current instrument VI . If the direction of rotation of the adjustment movement of its rotor NS coincides with the normal direction of rotation of the turntable, the contact arm r runs ahead of the contact arm d , and the rotor can freely adjust itself immediately; the turntable D follows it until it has reached its setting. However, if the direction of rotation of the setting movement of the rotor NS is opposite to the given direction of rotation of the turntable, the contact arm r runs onto the contact arm d , whereby, as already described in more detail, the .9 relay is actuated, which reverses the direction of the motor M ; then both contact arms run together in the new direction until the rotor has reached its new angular position. Thereupon the turntable D runs in spite of the opening of the contact d, r (because of the still closed self-holding circuit of the ^ relay) to its exact position

Angular position within the assigned sector continues, when it is reached, the setting motor is switched off will.

So that the turntable D can adjust unhindered to any command within a sector, the contact arms d and r are mounted on their shafts in such a mutual position that when the rotor NS is permanently set to a partial command, contact is made if and only when the turntable exceeds the limit of the sector assigned to the angle setting of the rotor (with normal running direction of the setting motor) during its setting movement, based on the spatial position of the scanning device.

Let us consider the special case that the new setting lies within the same sector as the previous one, but cannot be reached by the shortest route with the motor running in the normal direction. Since the partial command is the same for all commands in the same sector, the ratio current instrument will not perform any setting movement in this case. As a result, the turntable initially runs in the normal running direction from the existing setting up to the sector boundary, where the contact arm d reaches the contact arm r and the motor is reversed to reverse. This creates a certain detour within this sector, but it is a slight detour compared to a detour of almost 360 ° that the turntable would make in such a position of the new setting without direction control.

For the exemplary embodiment described, one is only for the sake of simplicity 5-digit code selected. In practice, however, higher-digit codes are usually required, to achieve the largest possible number of discrete angular positions, such. B. a 7 digit Code for one hundred and twenty-eight angular positions. Such higher-digit codes show the advantage the invention is particularly clear, because for each additional code, there is, as usual, an additional command relay, another sensing relay and another photocell required on the reversing circuit on the other hand, especially in the number of contacts for the contact combination to be applied of the ratio current instrument, nothing needs to change because the number of discrete angular positions selected of the ratio current instrument independent of the number of settings of the turntable can be maintained.

Claims (1)

Claim: Device for the motorized adjustment of an object in discrete angular positions, each a command, measured value, given as a combination of the components of a dual code Od. The like. Correspond to the purpose for which a rotating body is coupled to the object which all occurring dual combinations are stored scannable and with each cycle of the rotating body are scanned one after the other and with the dual combination specified by the command be compared, and at which device switching means (relays) are provided, which stop the setting motor as soon as they match (or in other ways) dual combinations assigned in a certain way come for comparison, characterized in that that to control the direction of rotation of the setting motor, the components of some specific, correspondingly selected codes from the total number of codes of the code used Their combinations also include the current coils of a two-coil or multi-coil ratio current instrument Motor-like design put in a known manner via relays to fixed voltages that are suitable for the ratio current instrument set in a small number of discrete, preferably evenly distributed angular positions over 360 °, each an angular adjustment range of the rotating body is assigned to these angular positions, in which all angle settings exactly corresponding to the respective complete dual combinations of the rotating body, and that between the rotor shaft of the ratio current instrument and the drive shaft of the rotating body a comparison contact device is arranged, which at opposite directions of rotation of the two shafts responds and possibly via a Relay reverses the direction of rotation of the setting motor. Considered publications: German Patent Specifications Nos. 288 860, 767 980, 026, 947 536. 1 sheet of drawings © 009 647/66 11.60