JPS5947143A - Index head controller - Google Patents

Abstract

PURPOSE:To decrease a number of limit switches attached to a code plate, by constituting the original point detecting limit switch in such a manner that a harmful secondary effect arising from a combined use with another limit switch is effectively prevented. CONSTITUTION:In the case of an index head controller of NC machine tool, a number representing an angular position, at which an index head 1 must arrive, is stored in a collating circuit 9 from an index instruction device 3, and simultaneously a driving gear 5 is operated on the basis of a signal generated from a control circuit 41, resulting in the start of rotation of the index head 1 and a code plate 6. Next, a count signal composing circuit 71 is an OR circuit, and when limit switches LS1 and LS2 are simultaneously operated in the reference angular position, any possiblity of double counting is never caused so far as these two signals are continuously generated. By this constitution, the number of the lmit switches attached to the code plate 6 can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a controller device for an indexing table used in an automated machine tool such as a numerical control (hereinafter referred to as No.) machine tool. Specifically, the number of limit switches (hereinafter referred to as limit switches provided on the code board) included in the signal generating means that emits one word corresponding to the angular position where the indexing table can stop is reduced. The present invention relates to an indexing table control device.

(2) Background of the technology The code board as a means of detecting the position in the indexing shed used for indexing control of the tool rest of the NO lathe, the imbrata table of the 110 milling machine and the NO machining center, the magazine of the ATO, etc. (b) Weighted limit switches are combined (■) to make a specific angular position correspond to a specific code signal, and (b) one to three limit switches are used to generate () There is a method of counting Z and % of loss.

Method (a) is superior in terms of detection angles, but the number of limit switches increases with the number of squares W to be detected. On the other hand, a limit switch with six cylinders is normally required. On the other hand, in the method (b), 11 usually emits a signal to be counted;
It has a limit switch of q or 2 dark and one limit switch for returning to the origin, but the detection accuracy is poor and a device for returning to the origin is required. The present invention
This is an improvement of the indexing table control device using the method (b).

(3) Prior art and problems An example of a block diagram of the indexing table control device f// using the method (b) above is '! ('%1 Shown in Figure.

"IV + Smell"Cs l is a 1ψj indexing table that can stop +1J at a specific angular position of the 8 cylinders marked 8.
1st position. same as below. ), and 3 is an indexing commanding device that commands the angular position at which the indexing table should stop.

4 is a control circuit, the above-mentioned home return command device r:2,
Indexing command device 3 has the function of rotating and stopping the indexing table 1 in response to other commands. Reference numeral 5 denotes a drive device for driving the indexing table 1, which is activated and activated by commands from the control device 4.
Stop. 6 is a code plate, and the limit switch L can be set at any of the specific angular positions shown in 1 to vm above.
Operate SI, L3+2, and LS3. for example,
The limit switch LSI is set at an odd angle position (1. m, v
, vn), the limit switch LS2 operates at the even inner position fe (n N tact v1 ■td, vm), and the limit switch LS3 operates at the reference angular position (1).
It operates in 7 is a count signal synthesis circuit;
A signal is emitted based on the signal from the limit switch LSI or rabbit 2.

Reference numeral 8 denotes a reversible ring counter, in which the number (1) representing the base rate square N(1) is changed to Brise by the origin return command issued based on the operation of the limit switch LS3 operating at the reference inner position M(1). After that, the count is counted up or down based on the signal output from the count signal synthesis circuit 7.

Reference numeral 9 denotes a verification circuit, which stores in advance the number commanded by the indexing command device 3, while a reversible ring counter 8
The output numbers of the indexing table 1 are sequentially inputted and compared, and when the numbers match, the indexing table 1 is sent to the control device 4.
A command is issued to stop the drive device 5 that is driving the .

10 is a parity check circuit which monitors whether the indexing table control operation is normal or not using the even/odd number stored in the reversible ring counter 8 and the signal of the limit switch currently operating. do.

The conventional indexing table control device described above includes limit switches LSI and LS2 that operate at a specific angular position where they can be stopped, and a limit switch LS3 for origin detection that operates at a reference angular position (1). However, if this original inspection 1f[l
It would be convenient if the J-mit switch LS3 could also be used as another limit switch.

(4) Purpose of the Invention The object of the present invention is to meet this need, and detects the position of the indexing base by counting signals emitted by a limit switch that operates at a specific corner position where the indexing base can be stopped. An object of the present invention is to provide an indexing table control device using this method, in which the number of limit switches attached to a code plate is reduced.

(5) Structure of the Invention The structure of the present invention includes (a) an indexing table (rotating body) that can stop DJ at a plurality of specific angular positions; A return-to-origin command device that issues a command to return to the attached R (for example, work; the same shall apply hereinafter); and (c) 9J.
an indexing command device that commands the angular position to which the delivery table (rotating body) should move; (2) a control circuit that controls the indexing table based on the commands of these command devices; and (e) a control circuit that is controlled by this control circuit. a drive device that rotates an indexing table (rotating body);
(f) The first signal generating means (limit switch ZS1 attached to the hood plate) that emits a signal when the indexing base (rotating body) is at an odd-numbered corner position and a second signal generating means (limit switch It821 attached to the code plate) which emits a signal when in the corner position, and (g) the indexing table (rotating body) stops based on the signals emitted by these signal generating means. (a) a reversible ring counter that counts the signals emitted by the count signal synthesis circuit; (1) Compare the number stored in this counter with the number commanded by the indexing command device, and check if these numbers are -
2, 3 (, , when,'' - 4 towards the control circuit,
A verification circuit that issues a command to stop the indexing table (rotation (4ζ), (,:) 'L11 reverse limp ring counter number, and the above signal generating means (limiter attached to the two 1゛ plate). In an indexing table control device having a parity check circuit and a number representing the signals emitted by a switch), the first and second
．． 1 signal generation means 4 [1 means (limit switches L S I , L S 21 that put red 1 on the code board), e.g. limit switch LS2], is a signal generating means of extension 1, that is, limit switch LSi receives the signal. Is the number to which 1 is a power, that is, the value of C (for example, 1, which corresponds to the reference angular position (1)!, . . .

same as below. ) in additive(,j S knee(,!,'
; Semi-position I FJ), and (wo) the above-mentioned barite,
In the f check circuit, the counter stores the number (1) corresponding to the reference position signal and generates the above reference position signal. The purpose of this is to ignore the reference position signal during this period.

(6) Embodiment of the Invention Hereinafter, an indexing table control device according to an embodiment of the present invention will be explained with reference to the drawings, and the configuration and unique effects of the present invention will be clarified.

FIG. 2 is its block diagram. In the figure, reference numerals 112.3 are an indexing base, a return-to-origin command device, and an index command device fR, respectively, similar to those shown in FIG. Reference numeral 41 denotes a control circuit, which operates in substantially the same manner as in the indexing table control device whose block diagram is shown in FIG. 1, as will be explained below. 5 and 6 are a drive device and a code plate, respectively, which are the same as shown in FIG. LSI, LS21 is a limit switch operated by a dog provided on the hood plate 6, and as shown in FIG. 3, the limit switch LSI operates at odd-numbered angular positions (work, ■, v, vn). Limit switch LS21 is in even angle position (IllIV, V
In addition to operating at the reference angular position (1), it also operates at the reference angular position (1) to generate a reference position signal. However, it is not necessarily necessary that the operating times of the limit switch LSI and the limit switch LS21 match extremely precisely. 7] is a signal ff1 synthesis circuit which outputs an output based on either the signal of the limit switch LS1 or the signal id of the limit switch LS21. Reference numeral 81 denotes a reversible ring counter, which is similar to the conventional indexing table control device 1 described with reference to FIG. Only when T; ◇ matches the number (1) representing the reference angular position (1), a logic "1" is output, which is used for parity checking. Reference numeral 9 denotes the same verification circuit as in the indexing table control device in the prior art described above. 101
is a parity check circuit, which is emitted when the F, L+ of the limit switch LSI operating at i''if number angular position (1) and the number stored in the counter 81 are even numbers (m and an AND circuit into which
(b) The signal of the limit switch LS21 which operates at the even angular position and the reference angular position (1), and the limit switches r and sl (odd number) are operating, and the counter 8
1 remembers the reference signal (1) (A
NI) condition) does not emit a signal that is the inverse of Z, AND -1
-NOT l! It is composed of a signal of the AN11 circuit 103 in which the signal of II Mid 102 is manually input, and an AND circuit in which the signal issued when the number stored in the counter 81 is an odd number is manually input. Reference numeral 11 is a home return signal generation circuit, and the signal generated by the limit switch LSI and LS21 and the home position? This is an AND circuit which inputs the commands based on the command device 2 and the commands based on the command device 2.

Indexing 1Ii) Before starting the operation, return to origin command device 2
Also, a return-to-origin command is issued to the control circuit 41 to operate the drive wave bfi 5 to rotate the indexing table l and the code plate 6. At this time, rotation direction selection, that is, shortcut control cannot be performed. Indexing table 1 is at reference angle position (1) ff1
1] When the limit switch LSI and LS21 operate simultaneously, the origin return signal generation circuit 11 operates, the indexing table l stops at that corner position, and the counter 81 is preset. In this embodiment, the reference angle position is l and the representative number is (1), so when the indexing table l reaches the corner position, the counter 81 is preset to (1). , the preparation for the indexing operation is completed.

Next, from the indexing command device 3, a number representing the angular position that the indexing table 1 should reach is stored in the H combiner circuit 9, and at the same time, the drive device 5 is operated based on a signal issued by the control circuit 41. Then, the indexing table 1 and the code plate 6 start rotating. At this time, the rotation direction is selected by the control circuit 41. The limit switch LSI and LS21 sequentially generate signals. This signal is the count signal synthesis circuit 7]
-, and the counter 81 counts both signals. As is clear from the figure, since the count signal synthesis circuit 71 is an OR circuit, when the limit switch LSI and limit switch LS21 operate simultaneously at the reference angle position, double counting is possible as long as these two signals are continuous. There is no risk of

This is because they are recognized as one continuous signal, rather than as two independent signals.

The number output from the counter 81 and the number output from the indexing command device 3 are compared by the matching circuit 9, and the indexing table 1 is stopped at a desired corner position, as in the case of the prior art described above.

As mentioned above, in the parity check circuit 101, no special measures have been taken for the part that receives the signal from the limit switch LSI, or the part that receives the signal from the limit switch LSI corresponds to the reference angular position (1). No. 111 is excluded and only the even signals are sent to the AND circuit 10.
3. That is, when the counter 81 stores the number (1) corresponding to the reference inner value H:< (1), a logic "1" is input to the AND+NOT circuit 102, and the limit switch LS1! ``Based on the overlap with the conditions of J7I production, AND +NOT time Ayu 102 is issued.Therefore, the limit switch LS is activated.
The AND circuit 103, which receives the signal from the limit switch LS21 and the output from the AND+NOT circuit 102, passes the signal from the limit switch LS21 only if the above overlap condition is satisfied. As a result, malfunctions of the validator check circuit are effectively prevented. In other words, limit switch S1
The even parity check is prevented from operating only while the counter 81 is in operation and the counter 81 stores (1) based on the IQ operation of the limit switch 21. Otherwise, all parity checks are performed normally. Operate.

V) As detailed in the description of the invention, the present invention uses a method of detecting the position of the indexing base by counting signals emitted by a limit switch that operates at a specific angular position where the indexing base can be stopped. In the indexing table control device made by the above, the limit switch for origin detection is also used as another limit switch, but the bad width effect due to this combination is effectively prevented, and the switch attached to the code plate is An indexing table controller can be provided that has a reduced number of limit switches.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional platform control device. FIG. 2 is a plotter diagram of an indexing table control device according to an embodiment of the present invention. Figure 3 shows the operation state of the signal generation stage f (limit switch) in the indexing table control device according to the book ζ: Akira Ichimi 1 custom! It is a time chart showing shellfish. 1...Rotating body (indexing table), 2...
Origin return command device, 3... Index command device,
4.41 ... Control circuit, 5 ... Drive device 1116 ... Cor1"Fi, 7, '71 -
・・・ Callan 1 signal combination circuit, 8.81 ・・・
Possible jψ ring counter, 9... Verification circuit,
]0.101... Parity check circuit, 10
2... AND ten NOT circuit, 103 ・
...AND circuit, 11... Home return signal generation circuit, I, Ell, LS2, LS21. , L
S3...Limit
S・f ツチ. Patent applicant: Fanuc V (ζ type company agent, patent attorney: Makoto Samukawa -

Claims (1)

[Claims] (a) a rotating body that can be stopped at a plurality of specific angular positions; (b) a home return command device that issues a command to return the rotating body to a reference angular position; an indexing command device that commands the angular position to be u1; (b) a control circuit that controls the indexing table based on the commands of the command device; and (e) a drive that rotates the rotating body under the control of the control circuit. a first signal generating means for generating a signal when the rotating body is in an odd numbered angular position; and a second signal generating means for generating a signal when the rotary body is in an even numbered angular position. and (g) a count signal synthesis circuit that generates one signal corresponding to each of the plurality of specific angular positions based on the signal generated by the first or second signal generating means; A reversible ring counter that can be reset and counts the number of signals generated by the count signal synthesis circuit; hand,
a) a verification circuit that issues a command to the control circuit to stop the rotating body when these numbers match; and (1) a verification circuit that issues a command to the control circuit to stop the rotating body; In the indexing table control device rt, which has a parity check circuit which generates a number representing the number i?, either of the first and second signal generating means generates another signal. The generating means emits an additive signal (reference position signal) at a specific angular position - (reference angle ti?t) among the angular positions at which the signal is to be emitted;
The nth parity check circuit stores the number corresponding to the reference position signal in the counter, and outputs the reference position signal during a period when a signal generating means other than the signal generating means for generating the reference position signal generates a signal. An indexing table NAJ control device characterized by ignoring ? ″I0