Disk

Abstract

To provide means for making an amount of an adhesive used when bonding a rotary disk and a rotary shaft nearly the same.SOLUTION: A disk that applies an adhesive 11 to a rotary disk 4 provided in a rotary shaft 1 and connects the rotary disk 4 by the adhesive 11 has a scale display 17 provided on the rotary disk 4, and an application range of the adhesive 11 is within the scale display 17.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disk, and more particularly to a novel improvement for approximately quantifying the amount of adhesive used when fixing a rotating disk to a rotating shaft, thereby achieving improved reliability of the product after assembly. [Background technology]

[0002] Conventionally used disks of this type include the configuration disclosed in Patent Document 1 shown in FIG. 6 and a product developed in-house by the present applicant shown in FIG. That is, what is indicated by the reference numeral 1 in FIG. 6 is a rotary shaft of the encoder, and a small diameter portion 2 of the rotary shaft 1 has a hole 4b of a rotary disk 4 inserted therein. A spacer 5 was provided on the rotary disk 4 via a first adhesive 6, and furthermore, a temporary fixing ring 7 was provided on the spacer 5 with a second adhesive 8.

[0003] In addition, in the conventional disk configuration shown in Figure 7, a rotating disk 4 is provided on a rotating shaft 1, and the rotating disk 4 and the rotating shaft 1 are connected together by a ring-shaped disk holder 10 provided on the rotating shaft 1. An adhesive 11 was applied to the outer periphery 10E of the annular disc holder 10 and the rotary disc 4. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-28397 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional disks, connected to the rotating shaft as described above, have the following problems: That is, in the case of the first conventional configuration shown in Fig. 6, in order to integrally connect the rotating shaft 1 and the rotating disk 4 via the second adhesive 8, the temporary fixing ring 7 and the spacer 5 were required via two layers of adhesive. This made the structure complicated, and there was a possibility that the adhesive would peel off. In addition, the two-layer adhesive required time for assembly. In addition, in the second conventional configuration shown in Figure 7, the rotating disk 4 and the rotating shaft 1 are mechanically joined by a ring-shaped disk holder 10, and then the outer edge 10c of the ring-shaped disk holder 10 and a part of the surface of the rotating disk 4 are integrally connected with adhesive 11. However, at high speeds (for example, at speeds exceeding 10,000 rpm), malfunctions can occur due to the adhesive peeling off, or variations in the amount of adhesive used during manufacturing can cause variations in the rotation characteristics of the disk. Also, when applying adhesive to the disk surface, there is no means to limit the area to which the adhesive is applied, so the amount of adhesive applied cannot be made uniform for each rotating disk, resulting in problems with variations in the amount of adhesive applied. [Means for solving the problem]

[0006] The disk according to the present invention is configured such that an adhesive is applied to a rotating disk mounted on a rotating shaft, the rotating disk is connected by the adhesive, the rotating disk has a scale marking, and the adhesive application range is within the scale marking. Also, the adhesive is applied to the rotating disk via an annular disk holder, and when the rotating disk and the annular disk holder are connected by the adhesive, the scale marking is provided on the rotating disk outside the annular disk holder, the scale marking comprises a first scale marking and a second scale marking having different diameters, and the application range is a region from the inside of the outer periphery of the annular disk holder to a midline between the first and second scale marks, the adhesive is dotted or solid, the rotating disk is a rotary code plate of an encoder, and the rotating shaft is an encoder shaft mounted on the encoder. [Effects of the Invention]

[0007] The disk according to the present invention has the above-described structure and therefore has the following advantages. In other words, adhesive is applied to a rotating disk attached to a rotating shaft, and the disk that connects the rotating disk with the adhesive has a scale marking on the rotating disk, and the adhesive application range is within the scale marking, so that the amount of adhesive applied to each disk can be made almost constant, the adhesive strength is stable, preventing the adhesive from peeling off from the rotating disk, and improving the reliability of encoders, etc. Furthermore, when the adhesive is applied to the rotating disk via a ring-shaped disk holder and the rotating disk and the ring-shaped disk holder are connected by the adhesive, the scale markings are provided on the outer side of the ring-shaped disk holder on the rotating disk. Also, by bonding via the ring-shaped disk holder, the disk can be more firmly connected to the rotating shaft. Furthermore, the scale indicator comprises a first scale indicator and a second scale indicator having different diameters, and the application range is the area from the inside of the outer periphery of the annular disc retainer to the midline of the width between the first and second scale indicators, so that a midline indicating the adhesive application limit can be created within the width of the first and second scale indicators. Furthermore, the adhesive is applied in the form of dots or a solid coating, which makes it easy to apply the adhesive to the rotating disk. Furthermore, the rotary disk is a rotary code plate of an encoder, and the rotary shaft is an encoder shaft provided in the encoder, thereby improving the quality of the encoder. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view showing the disk according to the embodiment of the present invention after assembly. [Figure 2] FIG. 2 is a cross-sectional view of an encoder using the disk of FIG. [Figure 3] FIG. 2 is an enlarged plan view showing a main part of the disk of FIG. [Figure 4] FIG. 4 is a plan view showing another configuration of FIG. 3. [Figure 5] FIG. 4 is a plan view showing another configuration of FIG. 3. [Figure 6] FIG. 1 is a cross-sectional view showing a first conventional configuration. [Figure 7] FIG. 10 is a cross-sectional view showing a second conventional configuration. DETAILED DESCRIPTION OF THE INVENTION

[0009] The disk according to the present invention is designed to substantially quantify the amount of adhesive used when fixing the rotating disk to the rotating shaft, thereby achieving improved reliability of the product after assembly. [Example]

[0010] Hereinafter, preferred embodiments of the disk according to the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a rotating shaft, and a rotating disk 4 used in an encoder or the like is provided on the outer periphery of this rotating shaft 1. A ring-shaped disk holder 10 supported by the rotating shaft 1 is provided on the surface 4a of the rotating disk 4, and multiple elastic protrusions 10a formed on the inner periphery 10F of this ring-shaped disk holder 10 engage with the outer periphery of the rotating shaft 1, thereby firmly connecting the rotating shaft 1 and the ring-shaped disk holder 10 together. Since the ring-shaped disk holder 10 is required to have sufficient elasticity, it is suitable to use steel or stainless steel.

[0011] By applying adhesive 11 (the shaded area in Figure 1) to the inside 10b of the outer periphery 10E of the annular disc holder 10 and the surface 4a of the rotating disc 4, the rotating shaft 1, the annular disc holder 10, and the rotating disc 4 are connected to each other extremely firmly and integrally.

[0012] When applying the adhesive 11 to the rotating disc 4 and the inner side 10b in the conventional manner, the amount and shape of the adhesive 11 vary for each rotating disc 4, and the application conditions change, so the goal is to prevent these problems and keep the amount applied to a constant level, making it possible to manage the amount and application position. For this reason, as shown in Figure 1, a scale indicator 17 consisting of first and second scale indicators 15 and 16 shown in Figure 3 is formed on the surface 4a of the rotating disc 4 outside the annular disc presser 10, in a position concentric with the rotating disc 4.

[0013] The first and second scale indicators 15, 16 are formed further outside the outer periphery 10E of the annular disc holder 10, and the actual application range A of the adhesive 11 is the region from the inside 10b of the outer periphery 10E of the annular disc holder 10 to a middle line 20 corresponding to the middle of the width W between the scale indicators 15, 16, as shown in Figure 3. In addition, since the application range A of the adhesive 11 is set in advance, there is very little variation in the amount of adhesive applied to one rotating disk 4, and furthermore, since a well-known jig (not shown) is used, the amount of adhesive applied can be minimized.

[0014] In the case of the rotating disk 4 described above, a case was described in which double dotted lines were formed on the surface 4a of the rotating disk 4 using a jig other than a chrome coating. For example, in the configuration of FIG. 4, a scale marking 17 is formed on the surface 4a of the rotating disk 4 using a chrome coating, and FIG. 5 shows a structure in which the chrome coated and uncoated portions of FIG. 4 are reversed. In addition, we have decided to omit things that have already been explained to avoid duplication. It should be noted that the above-described embodiment has been described with reference to a rotating disk of an encoder, as shown in the cross-sectional view of the encoder in Figure 2, but it goes without saying that it can be applied not only to encoders but also to other rotating disks not shown. [Industrial Applicability]

[0015] The disk of the present invention uses the first and second scale indicators formed on the rotating disk and the outer periphery of the annular disk retainer to preset the adhesive application area on the surface of the rotating disk before application, making it possible to control the application of adhesive to the surface, and as long as the paint is applied within the application area, the adhesive strength between the rotating disk and the rotating shaft can be maintained at the designed value, thereby significantly improving the reliability of encoders, etc., compared to conventional devices. [Explanation of symbols]

[0016] 1 Rotation axis 4 rotating discs 4a surface 10 Ring-shaped disc retainer 10a Elastic protrusion 10b inside 10E Outer circumference 10F Inner perimeter 11. Adhesive 15 First scale display 16 Second scale display 17 Scale display 20 Median Line A Application area W Scale display width

Claims

1. A disk in which an adhesive (11) is applied to a rotating disk (4) provided on a rotating shaft (1) and the rotating disk (4) is connected by the adhesive (11), The disk has a scale marking (17) provided on the rotating disk (4), and the application range (A) of the adhesive (11) is within the scale marking (17).

2. The disk according to claim 1, characterized in that when the adhesive (11) is applied to the rotating disk (4) via a ring-shaped disk holder (10) and the rotating disk (4) and the ring-shaped disk holder (10) are connected by the adhesive (11), the scale indication (17) is provided on the outside of the ring-shaped disk holder (10) on the rotating disk (4).

3. 3. The disk according to claim 2, characterized in that the scale markings (17) comprise a first scale marking (15) and a second scale marking (16) having different diameters, and the coating range (A) is an area extending from the inside (10b) of the outer periphery (10E) of the annular disk retainer (10) to a midline (20) of the width (W) between the first and second scale marks (15, 16).

4. 4. A disk according to claim 1, 2 or 3, characterized in that the adhesive (11) is in the form of a dot or a solid coating.

5. 2. The disk according to claim 1, wherein the rotating disk (4) is a rotating code plate of an encoder, and the rotating shaft (1) is an encoder shaft provided in the encoder.

6. 3. A disk according to claim 2, wherein the rotating disk (4) is a rotating code plate of an encoder, and the rotating shaft (1) is an encoder shaft provided in the encoder.

7. 4. A disk according to claim 3, wherein the rotating disk (4) is a rotating code plate of an encoder, and the rotating shaft (1) is an encoder shaft provided in the encoder.

8. 5. A disk according to claim 4, wherein the rotating disk (4) is a rotating code plate of an encoder, and the rotating shaft (1) is an encoder shaft provided in the encoder.

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