JPH04110910U - linear scale device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to enable the flexible output cable of a linear scale to smoothly follow the movement of the detection head in any direction, and to allow the flexible output cable to smoothly follow the movement of the detection head within the linear scale device frame. The purpose is to prevent unnecessary bending or damage to the material. [Structure] A flexible output cable 3 is provided to transmit a detection signal from a detection head 2 provided on a carriage portion 11 so as to move relative to a scale 1 on which a predetermined graduation pattern is recorded. . This flexible output cable 3
Abrasion-resistant protective tapes 12 and 13 are arranged along the inner and outer surfaces of the U-shaped folded back, and a steel tape 7 is arranged on the innermost side, and one end of these three is arranged. Frame body 10
The other end is fixed to the carriage part 11 to prevent the flexible output cable 3 from being bent unnaturally and to prevent the flexible output cable from being damaged by direct contact. There is.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses a detection head to detect the graduation pattern recorded on the surface of the scale. Regarding the linear scale device that measures the displacement of the detection head using the detection signal. Ru.

0002

[Conventional technology]

In recent years, linear sensors have been used to measure position and length in machine tools and various measuring instruments. Kale (e.g. magnetic scale) is used. This linear scale is an example of For example, a magnetic scale rod with a magnetic recording medium formed on the surface and a magnetic scale rod on which a magnetic recording medium is formed. It is equipped with a detection head that reads out the recorded magnetic scale. magnetic scale rod A magnetic scale pattern at equal intervals is recorded in advance. this magnetic scale rod , the detection head detects the magnetic scale, and the displacement (movement amount) of the detection head is determined by the detection head detecting the magnetic scale. ) is configured to be extracted as an electrical signal.

0003 Such linear scales usually house a magnetic scale rod inside the frame. Equipped with a carriage section to move the detection head relative to this scale. It is growing. This carriage part has a guide rail parallel to the magnetic scale rod inside the frame. The head holder holding the detection head slides on the guide rail. The detection head detects the magnetic scale from the magnetic scale rod. , outputs the detection signal to the outside through the output cable.

0004 Also, a flat flexible output cable for outputting the detection signal of the detection head. This flexible output cable is used to move the detection head. Move according to the range. A flat metal sheet along the outer surface of this flexible cable An idea to guide and protect the flexible output cable by arranging a guide plate consisting of 0-191998) has been proposed by the applicant.

[0005] This configuration allows for flexibility when installing the linear scale body on machine tools, etc. It is possible to save space depending on the movement range of the cable for flexible output, and it is also suitable for flexible output. Damage to the cable can now be prevented.

[0006]

[Problem that the idea aims to solve]

The problem we are trying to solve is the outer surface of the flat flexible output cable mentioned above. A guide plate made of a flat thin metal plate, that is, a steel tape, is placed along the , a linear scale housed in a frame has a magnetic scale as shown in Figure 3. The carriage part 11 moves along the rod 1, and the detection head provided on the carriage part 11 The magnetic scale detected by the pad 2 is converted into an electrical signal and then sent to the flexible output case. The data is sent to an external processing device via a cable 3.

[0007] The flexible output cable 3 is provided with a substrate portion 5 and a substrate portion 4 at both ends thereof, and The plate part 5 is fixed to the carriage part 11 and the board part 4 is fixed to the frame body 10 and folded back into a U-shape. It is shaped like this. The folded flexible output cable 3 is connected to the carriage part. 11, it slides on the partition plate 6. In addition, flexible output cables are also available. steel tape 7 to ensure smooth movement of cable 3 and to protect it. are disposed overlappingly on the outer surface of the flexible output cable 3. Therefore, As the ridge portion 11 moves, the flexible output cable 3 is guided by the steel tape 7. and moves along the partition plate 6 together with the steel tape 7.

[0008] In such a configuration, the steel tape 7 is attached to the outside of the flexible output cable 3. Since it is on the surface, the direction in which the steel tape 7 is pulled, that is, the left direction in FIG. (Symbol A) Even if the carriage part 11 moves quickly, the flexible output cable 3 is There is no particular problem as it moves by pushing from When moving to B), only the steel tape 7 moves in advance, and the flexible output cable A phenomenon in which the wheels 3 move in different ways (i.e., they cannot follow each other and move slowly). ) may easily occur, resulting in insufficient guidance. Necessary bending may occur, which may cause wire breakage. Also, often An accident in which the steel tape 7 fatigued and broke, damaging the flexible output cable 3. There was a problem that this occurred. The purpose of this invention is to solve the above problems. It is something.

[0009]

[Means to solve the problem]

In order to achieve the above object, the present invention uses a predetermined scale pattern as shown in FIG. A scale on which was recorded, a fixing plate that supports and fixes both ends of this scale, and the above scale. A detection head that moves relative to the scale and detects the scale pattern, and the above detection A carriage unit that moves the head and the above-mentioned detection unit that is moved by this carriage unit. A flexible output cable that transmits the detection signal of the output head, and a flexible output cable that transmits the detection signal of the output head. One end of the bull is fixed to the carriage, folded back in a U-shape halfway, and the other end is attached to the frame. A linear system that is fixed and slides while being guided by a partition plate as the carriage moves. At the cable, attach the cable to the inner and outer surfaces of the folded flexible output cable. Abrasion-resistant protective tape is placed along the inside of the abrasion-resistant protective tape. Construct a linear scale device with steel tape along the flexible output cable. It was completed.

0010

[Effect]

In the above configuration, the detection head moves according to the sliding movement of the carriage part, and The flexible output cable also moves as the cable moves, but the flexible output cable is wear-resistant. It is sandwiched with protective tape, and a steel tape is installed on the innermost side. Since the carriage is tilted, it has excellent tracking ability even when the carriage moves in either the left or right direction. In good condition. In other words, the flexible output cable is always exposed to the elasticity of the inner steel tape. Because sexual power is at work, there is no slackening. Therefore, the cable for flexible output is It moves smoothly while maintaining a constant U-shape. Also, in case the steel tape Flexible output cables are sandwiched with abrasion-resistant protective tape in case of breakage. damage can be prevented.

[0011]

【Example】 FIG. 1 is a front sectional view showing the overall configuration of an embodiment of the present invention. Figure 1 Smell The magnetic scale rod 1 has a magnetic scale pattern recorded at equal intervals on its surface in advance. Both ends are supported and fixed by fixing plates 9, 9 in the frame 10, respectively. Ru. The detection head 2 is held and fixed to the carriage part 11, and is The magnetic scale rod 1 is configured to move along the magnetic scale rod 1 by movement. this place In this case, the detection head 2 has a structure corresponding to the coaxial magnetic scale rod 1, for example. It is good.

0012 The magnetic scale detected by this detection head 2 is converted into an electric signal and then It is detected through the flexible output cable 3. This flexible output cable 3 is It is a net-shaped cable, with board parts 4 and 5 formed at both ends, and a board at one end. part 5 is attached to the carriage part 11, and the other end base plate part 4 is attached to the frame body. It is fixed to a bracket 16 provided at 10. In such a fixed state, it is possible to The flexible output cable 3 can be flexibly moved within the movement range of the detection head 2. It is housed in the frame 10 in a state where it is bent into a U-shape.

[0013] Specifically, the flexible output cable 3 is bent into a U-shape as shown in FIG. Polyaceta along the flexible output cable 3 on the inside and outside surfaces. Abrasion-resistant protective tapes 12 and 13 made of resin or polyester resin are arranged. The flexible output cable 3 is placed in a sandwich state. Furthermore, that A flexible output with steel tape 7 arranged on the inner surface and bent into a U-shape. The structure is such that an elastic force always acts on the cable 3 for use.

[0014] By the way, the carriage part 11 is arranged parallel to the magnetic scale rod 1. It slides on a guide rail (not shown) using bearings (not shown). It consists of a structure. This sliding movement of the carriage portion 11 causes the detection head 2 to move on the magnetic scale. It will move along the roll rod 1.

[0015] We will explain the operation of the example in the linear scale device configured as above. I will clarify. Now, the carriage part 11 slides on the guide rail and the magnetic scale rod Suppose that it moves parallel to 1. At this time, the carriage part 11 normally has the frame body 10. A handle (not shown) installed on the outside is attached, and this handle is operated. This causes the carriage portion 11 to slide. For sliding carriage part 11 Therefore, the detection head 2 moves along the magnetic scale rod 1, and the detection head 2 moves along the magnetic scale rod 1. Detect the magnetic scale recorded on card 1. The detection head 2 converts the detected magnetic scale into an electric After converting it into an air signal, it is output to the flexible output cable 3.

[0016] At this time, the top and bottom of the flexible output cable 3 are almost vertical due to the action of the steel tape 7. The frame body 1 is slid on the partition plate 6 while being bent in a U-shape so as to be parallel to each other. 0 and is configured to always maintain this shape. detection head The detection signal from 2 is sent to the output line 15 and the amplifier board via the flexible output cable 3. 14 to an amplifier (not shown), and after being amplified by this amplifier, it is sent to an external table. output to a display device, etc. Based on this detection signal, the displacement (movement amount) of the detection head 2 is ) will be detected.

[0017] By the way, when the detection head 2 moves according to the sliding movement of the carriage part 11, The flexible output cable 3 attached to the ridge portion 11 side also moves. This flexibility The output cable 3 is a flexible flat cable as described above, and is connected to the detection head. It is bent into a U-shape so that it can be moved flexibly within the movement range of the door 2. It is housed in the frame 10 in a state of Since the protective tapes 12 and 13 are arranged in a sandwich shape, it is difficult to slide on the partition plate 6. Even if the flexible output cable 3 is moved, the flexible output cable 3 will not be damaged. Then, set the innermost Due to the elastic force of the cut steel tape 7, the flexible output cable 3 is A fixed piece guided by the steel tape 7 and bent into a U-shape with good followability. It maintains its shape and moves smoothly according to the movement of the detection head 2.

[0018] Therefore, the flexible output cable 3 can be tracked depending on the direction of movement of the detection head 2. Damage caused by contact with other parts and frame body 1 are prevented from decreasing in compliance. Wire breakage due to unnecessary bending within 0 can be prevented. This allows for flexible output The life of the cable 3 can be extended, and the detection signal of the detection head 2 can be kept stable at all times. It is possible to output the

[0019]

[Effect of the idea]

Since the present invention is configured as explained above, the detection head movable system is In near-scale equipment, flexible output cables that move according to the movement of the detection head are used. The cable always maintains a constant shape without changing its followability depending on the direction of movement of the detection head. It can be kept in shape and moved smoothly. Therefore, the output of the scale within the frame is This eliminates unnecessary bending of power cables, preventing them from becoming bent or unnatural. This prevents the output cable from being disconnected or damaged due to bending. Even if the cable tape breaks, the flexible output cable can be protected with abrasion-resistant protective tape. Because it is protected, it will not be damaged, allowing stable measurements and flexible output. The life of the power cable can be extended.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing the configuration of a magnetic linear scale device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the flexible output cable of FIG. 1;

FIG. 3 is a front sectional view showing the configuration of a conventional magnetic linear scale device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Magnetic scale rod, 2... Detection head, 3... Flexible output cable, 4, 5... Board part, 6... Partition plate, 7... Steel tape, 8... Output wire, 9... Fixing plate, 10... Frame body,
11... Carriage part, 12, 13... Wear-resistant protective tape.

Claims (1)

[Scope of utility model registration request] 1. A scale on which a predetermined scale pattern is recorded, a fixed plate that supports and fixes both ends of the scale, a detection head that moves relative to the scale and detects the scale pattern, and a detection head that moves relative to the scale to detect the scale pattern. A carriage unit that moves the head, a flexible output cable that transmits the detection signal of the detection head that is moved by the carriage unit, and one end of this flexible output cable is fixed to the carriage, and a U-shaped cable is connected in the middle. In a linear scale device that is folded back into a shape, the other end is fixed to a frame body, and slides guided by a partition plate as the carriage moves, a flexible output cable is folded back and the other end is fixed to a frame body, and the flexible output cable is slid along the inner and outer sides. A linear scale device with an abrasion-resistant protective tape and a steel tape along the flexible output cable inside the inner abrasion-resistant tape.