JP6720006B2 - Encoder control system, encoder and control method of encoder control system - Google Patents

Description

The present invention relates to an encoder control system, an encoder, and a control method for the encoder control system.

Conventionally, a measuring instrument such as an encoder that detects a relative movement amount of a pair of measurement target portions that move relative to each other is known. As a conventional measuring instrument, a scale having a scale and a detector having a reading unit that moves along the scale are provided, and the reading unit reads the scale of the scale, whereby the relative movement amount between the scale and the detector. Those that detect are commonly used.
For example, the position measuring device (linear encoder) described in Patent Document 1 includes a scale plate (scale) having a scale base material and a scanning device (detector), and the scanning device is provided on the surface of the scale plate. A rolling member including a bearing and the like provided so as to abut is provided. Since the scanning device includes the rolling member, the scanning device can smoothly move along the longitudinal direction of the scale.

The encoder employs an electromagnetic induction type, an electrostatic capacitance type, a photoelectric type, or the like as a graduation reading system in the reading unit of the detector. The position measuring device (linear encoder) described in Patent Document 1 adopts a photoelectric system as a reading method, and the linear encoder described in Patent Document 2 adopts an electromagnetic induction system.
Here, the scale base material of the scale formed of glass or the like may be charged as the rolling member abuts on its surface and rolls. The electric charge charged on the scale base material causes a disturbance in the electric system (voltage, frequency, etc.) of the detector when discharged, which causes noise. In addition, when the scale base material is charged, dust easily adheres to the scale, the detector and the like, which causes detection failure and the like.

In order to prevent the scale base material from being charged, which causes these problems, the conventional position measuring device (linear encoder) grounds the scale base material.
As a method of grounding the scale base material, for example, in Patent Document 1, the scale plate (scale) has a conductive member on the surface of the scale base material, and a conductive connection for connecting the conductive member and the housing (scale frame). The member is provided at one end of the scale plate. That is, the scale plate is conductively connected to the housing via the connecting member. The housing is grounded via one measurement target portion. Therefore, in the position measuring device, the scale plate is grounded by conductively connecting the conductive member of the scale plate to one measurement target portion via the connecting member. Further, in Patent Document 2, the scale includes a conductive layer (conductive member) between the scale forming resist and the scale base material. The conductive layer is conductively connected to a conductive ground wire, and is conductively connected to the scale frame through the ground wire. The scale frame is grounded via one measurement object part. Therefore, the linear encoder grounds the scale base material by conductively connecting from the conductive layer of the scale base material to one measurement target portion via the ground wire.

Japanese Patent No. 2935454 JP, 2016-044967, A

However, in such an encoder, in order to ground the scale base material, it is necessary to conductively connect to the scale frame by using a connecting member or a grounding wire, and to ground the scale frame through one measurement target portion. However, there is a problem that the configuration of the encoder becomes complicated.

An object of the present invention is to provide an encoder control system capable of simplifying the configuration for grounding the scale base material while improving the reliability of the measurement result by removing the static electricity of the scale base material. is there.

An encoder control system according to the present invention detects a relative movement amount between a scale provided on one measurement target portion and having a scale base material on which scales are arranged and another scale provided on the other measurement target portion. A encoder control system including a detector, comprising: a drive unit that relatively moves the scale and the detector; and a control unit that controls the drive unit, wherein the scale is from the scale. The detector includes a measurement area in which the relative movement amount is detected by the detector, and a static elimination area having a conductive static elimination section, and the detector is a grounding section grounded via the other measurement target section. The control means, based on the static elimination determination unit that determines the necessity of static elimination, and the static elimination determination unit based on the determination of the static elimination determination unit, moves the detector to the static elimination area by the driving unit. A static elimination executing unit that statically eliminates static electricity by bringing the grounding unit into contact with the static elimination unit.

According to such a configuration, the encoder control system grounds the scale base material by bringing the grounding portion of the detector grounded through the other measurement target portion into contact with the static elimination portion of the static elimination area. You can Therefore, even if the scale base material is charged, it is possible to bring the grounding portion and the static elimination portion into contact with each other for grounding, thus suppressing the charging of the scale base material and improving the reliability of the detection result by the detector. it can.

Further, since it is possible to perform the grounding simply by bringing the grounding part and the static eliminator into contact with each other, there is no need for a connecting member or the like for grounding the scale base material as in Patent Document 1. Therefore, the structure for grounding the scale base material can be simplified and the cost can be reduced.
Furthermore, since the control means includes a static elimination determining unit that determines whether static elimination is necessary and a static elimination executing unit that statically eliminates static electricity by contacting the grounding unit with the static elimination unit based on the determination of the static elimination determining unit, static elimination is required. It is possible to drive and control the driving means at various timings and move the detector to the static elimination area for static elimination. Therefore, the control system of the encoder can efficiently remove the electric charge accumulated on the scale base material.

Here, the static eliminator may be worn by coming into contact with the ground or the like. Then, the encoder may cause detection failure due to abrasion powder or the like generated by abrasion of the charge eliminating portion.
On the other hand, in the present invention, until the charge removal determining unit determines that the charge removal is necessary, the measurement is continued in the measurement area, and the grounding unit and the charge removal unit are not brought into contact with each other. Generation of powder can be suppressed. That is, the control means does not move the detector to the static elimination area until static elimination is required by the static elimination determination unit, and continues the measurement in the measurement area, and therefore reduces the number of contacts between the grounding unit and the static elimination unit. You can Therefore, it is possible to reduce the generation of abrasion powder due to the contact between the grounding portion and the static elimination portion, suppress the detection failure, and maintain the reliability of the measurement accuracy.

At this time, the control means, a processing unit that counts the integrated value of the relative movement amount in the measurement area, the static elimination determination unit that determines the necessity of static elimination from the integrated value counted by the processing unit, Is preferably provided.

According to such a configuration, the control means includes a processing unit that counts the integrated value of the relative movement amount in the measurement area, and a static elimination determination unit that determines whether static elimination is necessary from the cumulative value counted by the processing unit. Since it is provided, it is possible to drive and control the drive unit at a timing at which static elimination is required according to the integrated value, and move the detector to the static elimination area to eliminate static electricity. Therefore, the control system of the encoder can efficiently remove the electric charge accumulated on the scale base material.
Further, since the processing unit counts the integrated value of the relative movement amount between the scale and the detector, it is not necessary to provide a sensor or the like for determining the necessity of static elimination, and the cost can be reduced.

The encoder of the present invention is an encoder that is drive-controlled by a control system for the encoder, wherein the scale includes a conductive portion that is formed along a direction in which scales of the scale base are arranged, The portion is a protruding portion formed by extending from the conductive portion in a direction intersecting the arrangement direction of the scales of the scale base material.

According to such a configuration, the static elimination portion is a part of the conductive portion, and the projection portion, which is the static elimination portion, is formed by extending from the conductive portion in a direction intersecting the arrangement direction of the scale of the scale base material. It can be brought into contact with the ground. That is, the static elimination portion for contacting the ground portion is formed as a protrusion extending from the conductive portion, so that static elimination can be performed without contact between the conductive portion and the ground portion. Therefore, since no abrasion powder is generated from the conductive portion, it is possible to suppress the detection failure of the detector and maintain the reliability of the measurement accuracy.

Further, unlike the conventional encoder, it is not necessary to provide a connecting member or the like for grounding the scale base material, and the grounding portion and the protruding portion that are conductively connected to the measurement target portion can be contacted and grounded. The configuration of the encoder can be simplified. Therefore, the encoder can ground the scale base material with a simple structure, and can reduce the cost.

The encoder of the present invention is an encoder that is drive-controlled by the control system of the encoder, and the grounding portion is a rolling member that rolls along the scale base material.

According to such a configuration, the rolling member has been conventionally provided as in Patent Document 1, and moves the surface of the scale base material along the arrangement direction of the scale along with the movement of the detector. Therefore, the rolling member can be brought into contact with the protruding portion (static elimination portion) formed to extend in the direction intersecting the arrangement direction of the scales of the scale base material simply by moving the detector. Therefore, the encoder can simplify the configuration of the encoder and reduce the cost by using the conventionally provided rolling member as the grounding portion that contacts the protruding portion.

The encoder of the present invention is an encoder which is drive-controlled by the control system of the encoder, wherein the measurement area is formed in series along the scale base material.

According to such a configuration, the measurement area can be secured in series along the scale base material, so that the measurement can be smoothly performed and the measurement accuracy can be improved. Further, since the encoder can perform measurement in the measurement area without passing through the static elimination area, it is possible to prevent abrasion of the static elimination portion due to contact with the ground portion.

A control method for controlling the control system of the encoder of the present invention is a scale having a scale base material provided with one measurement target portion and having graduations arranged thereon, and a scale relative to the scale provided with the other measurement target portion. A control method for an encoder control system including a detector that detects a movement amount, comprising: a drive unit that relatively moves the scale and the detector; and a control unit that controls the drive unit. The scale includes a measurement area in which the relative movement amount is detected by the detector from the scale, and a static elimination area having a conductive static elimination portion, and the detector includes the other measurement target portion. A grounding unit grounded through the control unit, the control unit determines whether or not static elimination is necessary, and based on the determination in the static elimination determination process, when it is determined that static elimination is necessary, the control unit detects the static electricity. Static electricity removal execution step of moving a container to the static elimination area and bringing the grounding part into contact with the static elimination part to perform static elimination.

According to such a configuration, the control unit includes a static elimination determination step of determining whether static elimination is necessary, and a static elimination execution step of static elimination by bringing the grounding part into contact with the static elimination part based on the determination of the static elimination determination step. Thus, it is possible to move the detector to the static elimination area and execute static elimination at an appropriate timing that requires static elimination. In addition, the encoder can suppress abrasion of the static eliminator due to contact between the grounding portion and the static eliminator, and can maintain reliability of measurement accuracy.

Front view and cross-sectional view showing an encoder according to the encoder control system of the present embodiment Front view showing a scale in the encoder Block diagram showing an encoder control system for controlling the encoder The flowchart which shows the control method in the control system of the said encoder

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view and a sectional view showing an encoder according to an encoder control system of the present embodiment. Specifically, FIG. 1(A) is a front view of the encoder 2, and FIG. 1(B) is a sectional view of the encoder 2 taken along the line AA of FIG. 1(A).
As shown in FIG. 1B, the encoder 2 in the encoder control system 1 is a measuring device that measures the moving distance between the pair of measurement target portions W1 and W2 that move relative to each other. The encoder 2 is, for example, an electromagnetic induction type linear encoder.

As shown in FIG. 1A, the encoder 2 includes an encoder body 3 and a detector 4 movably provided on the encoder body 3. In this encoder 2, the encoder body 3 is fixed to one measurement target portion W1, and the detector 4 is fixed to the other measurement target portion W2.
As shown in FIG. 1B, the encoder body 3 includes a long scale frame 5 and a scale 6 built in the scale frame 5. The scale frame 5 is formed of an extruded material made of aluminum alloy, and has a substantially rectangular hollow shape as a whole.
In the following description and the drawings, the movement direction of the detector 4 which is the longitudinal direction of the scale frame 5 is referred to as the X direction, and the width direction (depth direction) of the scale frame 5 orthogonal to the X direction is referred to as the Y direction. The up-down direction orthogonal to the X, Y directions may be referred to as the Z direction.

FIG. 2 is a front view showing a scale of the encoder. Specifically, it is a diagram of the scale 6 viewed from the −Y direction side.
As shown in FIG. 2, the scale 6 is formed in a linear shape on a long scale base material 7 made of glass or the like and one surface on the −Y direction side along the longitudinal direction (X direction) of the scale base material 7. The conductive portion 8 having the above-mentioned conductivity and the scale C formed of the coils formed on the conductive portion 8 and arranged at a constant pitch.
The conductive portion 8 is formed of a conductive material such as chromium (Cr), and protrudes as a static elimination portion that extends in a direction (Z direction) that intersects the arrangement direction (X direction) of the scales C of the scale base material 7. It has a section 8A.

As shown in FIG. 1B, the detector 4 is provided outside the scale frame 5 and is fixed to the other measurement target portion W2. The detection unit 10 is provided so as to extend inside. The detector 4 is grounded via the other measurement target portion W2.
As shown in FIG. 2, the detection unit 10 is connected to the detection unit 10 and a reading unit 10A that reads the relative movement amount of the scale 6 and the detection unit 10 from the scale C provided on the conductive unit 8 of the scale 6. And a bearing 11 that is provided on the surface of the scale base material 7 and rolls on the surface of the scale base material 7.
The reading unit 10A includes an exciting coil and a detecting coil. The exciting coil generates a magnetic flux when the encoder 2 passes a current, and also generates a magnetic flux on the graduation C facing the magnetic flux. The magnetic flux generated on the scale C further causes a magnetic flux to be generated in the detection coil of the reading unit 10A facing the scale. The detection coil reads the displacement amount of the magnetic flux generated on the scale C and detects the relative movement amount between the scale 6 and the detection unit 10.

The bearing 11 abuts on the surface of the scale base material 7 and also rolls along the conductive portion 8 to come into contact with the protruding portion 8A. A bearing 11B that rolls on the same line as 11A, a bearing 11C that rolls a line on the opposite side of the bearings 11A and 11B with the conductive portion 8 interposed therebetween, and a bearing 11A, 11B and 11C that are supported so as not to shift and scale A bearing 11D that rolls in contact with the side surface (-Z direction side) of the base material 7 and a side surface (-Z direction side) of the scale base material 7 that rolls and rolls in the same line as the bearing 11D. And a bearing 11E that operates.
The bearing 11A is a part of the detector 4 (detection unit 10) that is grounded through the other measurement target W2, and is a grounding unit. Therefore, the protrusion 8A formed on the surface of the scale base material 7 is used. Conductive connection by contact with. Therefore, the scale base material 7 is grounded only while the bearing 11A and the protruding portion 8A are in contact with each other.

In addition to the above-described configuration, the scale 6 includes a measurement area 20 in which the reading unit 10A reads the scale C, and a static elimination area 30 in which the protruding portion 8A which is the static elimination portion and the bearing 11A which is the ground portion are in contact with each other. ing.
The projecting portion 8A, which is a static elimination portion, is formed in a size that allows it to contact the bearing 11A, which is a ground portion, in the static elimination area 30. Specifically, since the scale base material 7 is grounded only while the bearing 11A and the protruding portion 8A are in contact with each other, if the scale base material 7 is to be grounded for a long time, the bearing 11A is separated by a certain distance in the X direction. If a protrusion 8A having a length capable of rolling is provided and it is desired to be grounded for a short time, the protrusion 8A can be provided short in the X direction.

The measurement area 20 is formed in series along the longitudinal direction (X direction) of the scale base material 7. Therefore, the detection unit 10 can perform measurement in the measurement area 20 without passing through the static elimination area 30.
As shown in FIG. 2, the static elimination area 30 is formed at the end of the scale base material 7 on one end side (+X direction side) in the longitudinal direction. The static elimination area 30 may be provided only on one end side (+X direction side) of the scale base material 7 in the longitudinal direction, or the other end side (-X direction) of the scale base material 7 in the longitudinal direction. It may be provided only at the end of (side), or may be provided at both ends of the scale base material 7.

FIG. 3 is a block diagram showing an encoder control system for controlling the encoder.
An encoder control system 1 includes an encoder 2 that measures a moving distance between a scale 6 and a detection unit 10 that move relative to each other, a scale 6 fixed to a pair of measurement target portions W1 and W2, and a detection unit 10. A driving unit 40 such as a motor for moving the driving unit 40 and a control unit 50 for controlling the driving unit 40 are provided.
Based on a command from the control means 50, the drive means 40 drives the other measurement target portion W2 (see FIG. 1B) to which the detector 4 is fixed to move the detection portion 10.

The control unit 50 counts the integrated value of the relative movement amount in the measurement area 20, the static elimination determination unit 52 that determines whether static elimination is necessary from the integrated value counted by the processing unit 51, and the static elimination determination unit 52. When it is determined that static elimination is necessary based on the determination of No. 6, the drive unit 40 moves the detection unit 10 to the static elimination area 30, and the static elimination executing unit 53 that statically eliminates static electricity by bringing the bearing 11A into contact with the protrusion 8A. ..
The processing unit 51 counts the integrated value based on the relative movement amount between the scale 6 and the detection unit 10. Here, the integrated value counted by the processing unit 51 is the cumulative movement distance that the detection unit 10 has moved with respect to the scale 6 from the start of measurement.
The static elimination determination unit 52 has a predetermined threshold value for the integrated value, and determines that static elimination is necessary when the integrated value exceeds the predetermined threshold value.
The charge removal execution unit 53 moves the detection unit 10 to the charge removal area 30 based on the determination result determined by the charge removal determination unit 52 to perform charge removal.

FIG. 4 is a flowchart showing a control method in the control system of the encoder.
The operation of the encoder control system 1 will be described with reference to FIG.
As shown in FIG. 4, the encoder control system 1 first causes the encoder 2 to start measurement. Next, the processing unit 51 of the control unit 50 acquires the relative movement amount between the scale 6 and the detection unit 10 read by the reading unit 10A in the measurement area 20 (step ST01). The relative movement amount acquired by the processing unit 51 is displayed on the display unit or the like as an integrated value.
Subsequently, the processing unit 51 executes a processing step of counting the integrated value of the relative movement amounts acquired in step ST01 (step ST02). The processing unit 51 continues to acquire the relative movement amount and continue to count the integrated value while the measurement by the encoder 2 is being performed.

Subsequently, the static elimination determination unit 52 executes the static elimination determination step of determining whether or not static elimination is necessary from the integrated value of the relative movement amounts obtained in the processing step (step ST02) (step ST03). When the integrated value reaches a predetermined threshold value and it is determined that the charge removal is necessary (YES in step ST04), the charge removal determination unit 52 issues a command to the drive unit 40. Then, the drive unit 40 drives the other measurement target portion W2 to move the detection unit 10 to the static elimination area 30, and brings the bearing 11A, which is the grounding portion, into contact with the protrusion 8A, which is the static elimination portion, to ground them. A static elimination execution step for static elimination is executed (step ST05).

If the static elimination determination unit 52 has not determined that static elimination is necessary (NO in step ST04), the encoder 2 returns to step ST01.
After the drive unit 40 executes the static elimination execution step (step ST05), the control unit 50 resets the integrated value of the processing unit 51 (step ST06). Then, the encoder 2 returns to step ST01 and continues the measurement.

According to this embodiment as described above, the following actions and effects can be achieved.
(1) The encoder control system 1 brings the bearing 11A (grounding portion) of the detector 4 grounded through the other measurement target portion W2 into contact with the protrusion 8A (static elimination portion) of the static elimination area 30. The scale base material 7 can be grounded. Therefore, even if the scale base material 7 is charged, the bearing 11A and the protruding portion 8A can be brought into contact with each other to be grounded, so that the charge of the scale base material 7 is suppressed and the reliability of the detection result by the detector 4 is improved. Can be planned.

(2) Since the encoder control system 1 can be grounded only by bringing the bearing 11A and the protruding portion 8A into contact with each other, a connecting member or the like for grounding the scale base 7 like the scale 6 of Patent Document 1 is provided. do not need. Therefore, the structure for grounding the scale base material 7 can be simplified and the cost can be reduced.
(3) The control unit 50 includes a processing unit 51 that counts the integrated value of the relative movement amount in the measurement area 20, a static elimination determination unit 52 that determines whether static elimination is necessary from the cumulative value counted by the processing unit 51, and static elimination. Since the static elimination executing unit 53 that removes static electricity by bringing the bearing 11A into contact with the protruding portion 8A based on the determination of the determination unit 52, the drive unit 40 is drive-controlled at a timing when static elimination is required, and the detector 4 is statically eliminated. It is possible to move to the area 30 and eliminate the charge. Therefore, the control system 1 of the encoder can efficiently remove the electric charge on the scale base material 7.

(4) The control unit 50 continues the measurement in the measurement area 20 and does not bring the bearing 11A and the protrusion 8A into contact with each other until the charge elimination determination unit 52 determines that the charge elimination is necessary. Generation of abrasion powder due to abrasion can be suppressed. Therefore, it is possible to reduce the generation of abrasion powder due to the contact between the bearing 11A and the protruding portion 8A, suppress the detection failure, and maintain the reliability of the measurement accuracy.

(5) Since the processing unit 51 counts the integrated value of the relative movement amount between the scale 6 and the detector 4, it is not necessary to provide a sensor or the like for determining the necessity of static elimination, and the cost can be reduced. it can.
(6) The static elimination portion is a part of the conductive portion 8, and the protruding portion 8A, which is the static elimination portion, extends from the conductive portion 8 in a direction (Z direction) that intersects with the arrangement direction (X direction) of the scales C of the scale base material 7. By being formed to extend, it can be brought into contact with the bearing 11A. That is, the static elimination portion for contacting the bearing 11A is the protruding portion 8A formed by extending from the conductive portion 8, so that the static elimination can be performed without the conductive portion 8 and the bearing 11A contacting each other. Therefore, since no abrasion powder is generated from the conductive portion 8, the detection failure of the detector 4 can be suppressed and the reliability of the measurement accuracy can be maintained.

(7) The bearing 11A is brought into contact with the protruding portion 8A formed by extending in the direction (X direction) intersecting the arrangement direction (X direction) of the scales C of the scale base material 7 only by moving the detector 4. You can Therefore, the encoder 2 can simplify the configuration of the encoder 2 and reduce the cost by using the bearing 11A that has been conventionally provided as a grounding portion that contacts the protruding portion 8A.

(8) Since the measurement area 20 can be secured in series along the scale base material 7, the measurement can be smoothly performed and the measurement accuracy can be improved. Further, since the encoder 2 can perform measurement in the measurement area 20 without passing through the static elimination area 30, it is possible to prevent the protrusion 8A from being worn due to contact with the bearing 11A.
(9) The control unit 50 does not move the detector 4 to the static elimination area 30 until the static elimination determination unit 52 needs to eliminate static electricity, and continues the measurement in the measurement area 20, so that the bearing 11A and the protrusion 8A The number of contacts can be reduced. Therefore, it is possible to reduce the generation of abrasion powder due to the contact between the bearing 11A and the protruding portion 8A, suppress the detection failure, and maintain the reliability of the measurement accuracy.

(10) The control unit 50 performs the static elimination determining step (step ST03) for determining the necessity of static elimination, and the static elimination executing step for statically eliminating the static electricity by bringing the bearing 11A into contact with the protruding portion 8A based on the determination of the static elimination determining step (step ST03). By including (step ST05), it is possible to move the detector 4 to the static elimination area 30 and perform static elimination at an appropriate timing that requires static elimination.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described one embodiment, and modifications, improvements, etc. within a range in which the object of the present invention can be achieved are included in the present invention.
For example, in the above-described embodiment, the case where the present invention is used for the encoder 2 which is an electromagnetic induction type linear encoder has been described. However, as long as the encoder is provided with a detector that is movably provided in the encoder body 3. Of course, the type and detection method of the detector are not particularly limited.

Further, the encoder 2 may be a rotary encoder instead of a linear encoder. In this case, the detector moves along the circumferential direction of the scale base material, and the projecting portion, which is the static elimination portion, is formed to extend from the conductive portion in the radial direction of the scale base material. The static elimination area is provided in a part of the measurement area formed along the circumferential direction of the scale base material.

In the above-described embodiment, the scale frame 5 of the encoder body 3 is formed in a generally rectangular hollow shape, but the shape of the scale frame 5 is not limited to a rectangle and may be any shape.
In the above embodiment, the bearing 11A is used as the rolling member that is the grounding portion, but any configuration may be used as long as it can be brought into contact with the protruding portion 8A that is the static eliminating portion by moving the detector 4. Further, although the protruding portion 8A is formed on one surface of the scale base material 7 on the −Y direction side, it may be formed on a side surface of the scale base material 7 on the −Z direction side, and is brought into contact with the ground portion. Any structure may be used as long as it can be grounded. Further, the projecting portion 8A, which is the static elimination portion, is formed so as to extend from the conductive portion 8, but the static elimination portion only needs to be conductively connected to the conductive portion 8 and may be connected by a conductive ground wire or the like. Good.

In the above-described embodiment, the static elimination area 30 is formed at the end portion on the one end side (+X direction side) in the longitudinal direction of the scale base material 7, but it may be provided at the intermediate portion of the measurement area 20. Further, the static elimination area 30 may be provided in a wider area than the measurement area 20, or the static elimination areas 30 and the measurement areas 20 may be alternately provided.
Although the scale C is formed in both the measurement area 20 and the static elimination area 30 in the above-described embodiment, it may not be provided in the static elimination area 30.
Further, although the protruding portion 8A is formed only at one place in a part of the static elimination area 30, it may be formed on the entire surface of the static elimination area 30 or a plurality of protruding portions 8A may be formed. That is, the protruding portion 8A, which is the static elimination portion, may be formed in any manner as long as it is formed in the static elimination area 30 and at a position where it can contact the ground portion. Further, although the protruding portion 8A, which is the charge eliminating portion, is in contact with the bearing 11A, it may be brought into contact with any of the bearings 11B, 11C, 11D and 11E.

In the above-described embodiment, the processing unit 51 counts the cumulative movement distance that the detection unit 10 has moved with respect to the scale 6 from the start of measurement as an integrated value, but the cumulative time from the start of counting and the charge amount of electric charge. Etc. may be counted as the integrated value.
In the above embodiment, the encoder control system 1 includes the charge removal determination unit 52 in the control unit 50 and executes the charge removal when the integrated value exceeds the predetermined threshold value. It may be possible to determine when the power is turned on or when the use of the encoder 2 is finished.

INDUSTRIAL APPLICABILITY As described above, the present invention can be suitably used for the encoder control system, the encoder, and the control method for the encoder control system.

1 Encoder control system 2 Encoder 4 Detector 6 Scale 7 Scale base material 8 Conductive part 8A Projection part (static elimination part)
10 Detector 11 Bearing (rolling member)
11A bearing (rolling member, grounding part)
20 measurement area 30 static elimination area 40 drive means 50 control means 51 processing section 52 static elimination determination section 53 static elimination execution section C scale W1, W2 a pair of measurement target sections

Claims (6)

A scale having a scale base material in which scales are arranged while being provided in one measurement target portion, and a detector that is provided in the other measurement target portion and detects a relative movement amount with the scale, and an encoder provided with A control system,
Drive means for relatively moving the scale and the detector,
A control means for controlling the drive means,
The scale is
A measurement area in which the relative movement amount is detected by the detector from the scale,
A static eliminator having a conductive static eliminator,
The detector is
A grounding unit grounded via the other measurement target unit;
The control means is
A static elimination determination unit that determines whether static elimination is necessary,
Based on the determination of the static elimination determining unit, when it is determined that static elimination is necessary, the detector is moved to the static elimination area by the driving unit, the static elimination executing unit for static elimination by contacting the grounding unit with the static elimination unit, An encoder control system comprising: The encoder control system according to claim 1,
The control means is
A processing unit that counts an integrated value of the relative movement amount in the measurement area,
A static elimination determination unit that determines whether static elimination is necessary based on the integrated value counted by the processing unit. An encoder driven and controlled by the encoder control system according to claim 1 or 2,
The scale is
A conductive conductive portion is formed along the arrangement direction of the scale of the scale substrate,
The said static elimination part is a protrusion part extended and formed from the said conductive part in the direction which intersects with the arrangement direction of the scale of the said scale base material, The encoder characterized by the above-mentioned. An encoder driven and controlled by the encoder control system according to claim 1 or 2,
The ground portion is
An encoder comprising a rolling member that rolls along the scale base material. An encoder driven and controlled by the encoder control system according to claim 1 or 2,
The measurement area is
An encoder formed in series along the scale base material. A scale having a scale base material in which scales are arranged while being provided in one measurement target portion, and a detector that is provided in the other measurement target portion and detects a relative movement amount with the scale, and an encoder provided with A control method for a control system, comprising:
Drive means for relatively moving the scale and the detector,
A control means for controlling the drive means,
The scale is
A measurement area in which the relative movement amount is detected by the detector from the scale,
A static eliminator having a conductive static eliminator,
The detector is
A grounding unit grounded via the other measurement target unit;
The control means is
A static elimination determination step of determining whether static elimination is necessary,
Based on the determination of the static elimination determination step, when it is determined that static elimination is required, the detector is moved to the static elimination area by the driving unit, a static elimination execution step of static elimination by contacting the ground portion with the static elimination unit, A method for controlling an encoder control system, comprising:

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