JP3316793B2 - Manufacturing method of coaxial cylindrical torque limiter and coaxial cylindrical torque limiter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a coaxial cylindrical torque limiter and a coaxial cylindrical torque limiter, and more particularly, to a method of manufacturing a cylindrical permanent magnet made of synthetic resin.
A coaxial cylindrical torque limiter that has a sufficiently high adhesive force to adhere to the outer peripheral surface of the rotating shaft or the inner peripheral surface of the synthetic resin rotating cylinder, has excellent sliding properties of the sliding portion, and requires less time and effort for manufacturing. And a coaxial cylindrical torque limiter.

[0002]

2. Description of the Related Art FIG. 5 is an end view showing an example of a reverse roller for preventing double feed of a paper feeder using a conventional coaxial cylindrical torque limiter 500. In the coaxial cylindrical torque limiter 500, around the metal shaft 3a,
The rotating shaft 53 is fitted. The rotating shaft 53 has a drum shape and is made of polyacetal resin (POM). On the outer peripheral surface of the rotating shaft 53, a cylindrical permanent magnet 2 is provided.
1 are bonded via an adhesive layer 2. This permanent magnet 21
Is a neodymium-based bonded magnet.

[0003] The rotary cylinder 32 is made of a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin. A cylindrical semi-hard magnetic body 22 is fixed to the inner peripheral surface of the rotary cylinder 32 by press-fitting. The semi-hard magnetic body 22 is made of an Fe-Cr-Co magnetic material.

The rotating shaft 53 and the rotating cylinder 32 are arranged coaxially so that the permanent magnet 21 and the semi-hard magnetic body 22 can face each other with a gap A therebetween and rotate relatively. I have. A lid 32a is attached to the rotary cylinder 32, and a rubber roller G is fitted thereto.

When the metal shaft 3a and the rotating shaft 53 rotate and the permanent magnet 21 rotates, a hysteresis torque acts between the permanent magnet 21 and the semi-hard magnetic body 22, and the rotating cylinder 32 rotates. Then, the rubber roller G rotates. Then, the multi-feed paper is separated by a force corresponding to the hysteresis torque.

Next, a procedure for bonding the permanent magnet 21 will be described. As shown in FIGS. 6A, 6B, and 6C, the adhesive 2a is applied to the outer peripheral surface of the rotating shaft 53, the permanent magnet 21 is fitted thereon, and the permanent magnet is pushed down. As shown in FIG. 6C, when the adhesive 2a is cured, the permanent magnet 21 is fixed to the rotating shaft 53 via the adhesive layer 2.

Japanese Patent Application Laid-Open No. 6-221341 discloses that the rotating shaft 53 is made of a metal material (aluminum, zinc,
A technique has been disclosed in which the adhesive strength between the rotating shaft and the permanent magnet 21 is increased by forming the permanent magnet 21 from brass, stainless steel, or the like.
Japanese Patent Application Laid-Open No. 8-2377973 discloses that a permanent magnet fixing portion of a rotating body is formed of a metal material, and a sliding portion is formed of a synthetic resin material, thereby increasing the adhesive force with the permanent magnet.
A technique has been disclosed in which the slidability of a sliding portion is improved.

[0008]

In the conventional coaxial cylindrical torque limiter 500, it is not easy to firmly adhere the permanent magnet 21 to the synthetic resin rotating shaft 53, so that the permanent magnet 21 rotates during use. There is a problem that the rotary shaft 53 slips off from the shaft 53 or slips with the permanent magnet 21 to easily run idle, so that reliability as a torque limiter cannot be obtained. Further, in the technology disclosed in Japanese Patent Application Laid-Open No. 6-221341, there is a problem that the slidability of the sliding portion is deteriorated and the torque value is likely to be unstable. Further, Japanese Patent Laid-Open No. 8-
In the technique disclosed in Japanese Patent No. 237973, since the permanent magnet fixing portion and the sliding portion are made of different materials, they must be separately formed and integrated (for example, a metal cylinder is fitted over a synthetic resin cylinder). ), There is a problem that the production is troublesome. Therefore, an object of the present invention is to provide a cylindrical permanent magnet.
A coaxial cylinder that has a sufficiently high adhesive force to adhere to the outer peripheral surface of the synthetic resin rotary shaft or the inner peripheral surface of the synthetic resin rotary cylinder, has excellent sliding properties of the sliding portion, and requires less labor for manufacturing. An object of the present invention is to provide a method of manufacturing a mold torque limiter and a coaxial cylindrical torque limiter.

[0009]

According to a first aspect of the present invention, a cylindrical permanent magnet is bonded to an outer peripheral surface of a rotating shaft made of synthetic resin or an inner peripheral surface of a rotating cylinder. A cylindrical semi-hard magnetic body is fixed to a surface or an inner peripheral surface of the rotary cylinder to which the permanent magnet is not bonded, and the permanent magnet and the semi-hard magnetic body are opposed to each other with a gap therebetween and relatively. The rotating shaft and the rotating cylinder are arranged coaxially so as to be rotatable, and rotation is transmitted between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the permanent magnet and the semi-hard magnetic body. A method for producing a coaxial cylindrical torque limiter, wherein the outer peripheral surface of the synthetic resin rotating shaft or the inner peripheral surface of the synthetic resin rotating cylinder is subjected to a primer treatment, and then an adhesive is applied thereto. Coaxial cylinder characterized by bonding To provide a method of manufacturing a torque limiter. According to the method of manufacturing the coaxial cylindrical torque limiter according to the first aspect, the outer peripheral surface of the synthetic resin rotary shaft or
The permanent magnet is adhered after the inner peripheral surface of the synthetic resin rotating cylinder is surface-treated with the primer, so that the permanent magnet can be firmly adhered even to a synthetic resin in which it is difficult to obtain a sufficient adhesive force. Therefore, peeling of the permanent magnet is prevented for a long period of time, and the reliability as a torque limiter is improved. In addition, since a rotating shaft or a rotating cylinder made of a synthetic resin is used, excellent slidability is obtained. Furthermore, since it is not a composite of a synthetic resin and a metal material, there is no need for manufacturing time.

According to a second aspect, the present invention provides a method of manufacturing a coaxial cylindrical torque limiter according to the present invention, wherein the primer-treated surface is further heated. I do. According to the manufacturing method of a coaxial cylindrical torque limiter according to the second aspect, activated primers by further heat treating the primer-treated surface, synthetic resin of the rotating shaft of the outer or synthetic resin of the rotary cylinder The effect of modifying the surface of the inner peripheral surface is improved. As a result, synthetic binding between the resin of the rotating shaft outer or inner circumferential surface of the synthetic resin of the rotating cylinder with the adhesive becomes more robust, and thus the outer peripheral surface of the synthetic resin of the rotary shaft or synthetic The permanent magnet can be more firmly bonded to the inner peripheral surface of the resin rotary cylinder.

According to a third aspect of the present invention, in the method for manufacturing a coaxial cylindrical torque limiter having the above-described structure, the color of the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotating cylinder after the primer treatment is changed. A method for producing a coaxial cylindrical torque limiter, characterized in that the color is different from the color before the primer treatment. According to the method of manufacturing a coaxial cylindrical torque limiter according to the third aspect, it is possible to determine at a glance whether or not the primer treatment has been performed. Therefore, it is possible to prevent a product in which the permanent magnet is adhered due to forgetting the primer treatment from occurring. Can be.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a coaxial cylindrical torque limiter having the above structure, wherein an adhesive is applied only to a part of the primer-treated surface, and the permanent magnet is rotated thereon. A method of manufacturing a coaxial cylindrical torque limiter, characterized in that the adhesive is spread while fitting. According to the method of manufacturing a coaxial cylindrical torque limiter according to the fourth aspect, the labor for applying the adhesive can be greatly reduced as compared with the case where the adhesive is applied to the entire surface of the primer-treated surface.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a coaxial cylindrical torque limiter according to the present invention, wherein a cyanoacrylate adhesive is used as an adhesive. provide.
According to the method of manufacturing the coaxial cylindrical torque limiter according to the fifth aspect, the permanent magnet can be suitably bonded to the synthetic resin rotary shaft or rotary cylinder in combination with the surface treatment using the primer.

According to a sixth aspect of the present invention, a cylindrical permanent magnet is bonded to an outer peripheral surface of a rotating shaft made of synthetic resin or an inner peripheral surface of a rotating cylinder with an adhesive, and the outer peripheral surface of the rotating shaft or the above A cylindrical semi-hard magnetic body is fixed to the inner peripheral surface of the rotating cylinder on which the permanent magnet is not bonded, and the permanent magnet and the semi-hard magnetic body can be opposed to each other with a gap and can rotate relatively. The rotating shaft and the rotating cylinder are coaxially arranged as described above, and a coaxial cylinder that transmits rotation between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the permanent magnet and the semi-hard magnetic material. Type torque limiter,
The outer peripheral surface of the synthetic resin rotary shaft or the synthetic resin
Outer or if the inner peripheral surface of the rotary cylinder have been primed, the primer treated synthetic resin rotating shaft
A coaxial cylindrical torque limiter, wherein a chemical bond is formed between an inner peripheral surface of a rotating cylinder made of a synthetic resin and the adhesive. According to the coaxial cylindrical torque limiter according to the sixth aspect, a chemical bond is formed between the outer peripheral surface of the primer-processed synthetic resin rotary shaft or the inner peripheral surface of the rotary cylinder and the adhesive. The permanent magnet is firmly adhered to the outer peripheral surface of the synthetic resin rotary shaft or the inner peripheral surface of the rotary cylinder, so that peeling of the permanent magnet is prevented, and the reliability as a torque limiter is improved. Further, since a rotating shaft or a rotating cylinder made of a synthetic resin is used, excellent slidability is obtained. Furthermore, because it is not a composite of synthetic resin and metal material,
Hassle-free production.

According to a seventh aspect of the present invention, in the coaxial cylindrical torque limiter having the above structure, one of the rotating shaft and the rotating cylinder made of the synthetic resin is made of polyolefin resin or polyacetal resin, and the other is made of polyacetal resin. A coaxial cylindrical torque limiter characterized by being made of a polyacetal resin or a polyolefin resin. According to the coaxial cylindrical torque limiter according to the seventh aspect, since a polyolefin resin and a polyacetal resin having excellent slidability are used in combination, the rotation can be smoothly performed, and the torque value can be stabilized.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

First Embodiment FIG. 1 is an end view showing an example of a reverse roller for preventing double feed of a paper feeder using a coaxial cylindrical torque limiter 100 according to a first embodiment of the present invention. is there. In the coaxial cylindrical torque limiter 100, the rotating shaft 3 is fitted around the metal shaft 3a. This rotating shaft 3
Has a drum shape and is made of a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin. In addition, a polyacetal resin (POM) is also used in addition to the polyolefin resin. The outer peripheral surface of the rotating shaft 3 is subjected to a primer treatment, and a cylindrical permanent magnet 21 is adhered to the outer peripheral surface of the primed rotating shaft 3 via the adhesive layer 2.

The rotary cylinder 32 is made of polyacetal resin (PO
M). When the rotating shaft 3 is made of a polyacetal resin, the rotating cylinder 32 is made of a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin. A cylindrical semi-hard magnetic body 22 is fixed to the inner peripheral surface of the rotary cylinder 32 by press-fitting. The semi-hard magnetic body 22 is made of an Fe-Cr-Co magnetic material.

The rotary shaft 3 and the rotary cylinder 32 are arranged coaxially so that the permanent magnet 21 and the semi-hard magnetic body 22 can face each other with a gap A therebetween and rotate relatively. I have. A lid 32a is attached to the rotary cylinder 32, and a rubber roller G is fitted thereto.

When the metal shaft 3a and the rotating shaft 3 rotate and the permanent magnet 21 rotates, a hysteresis torque acts between the permanent magnet 21 and the semi-hard magnetic body 22, and the rotating cylinder 32 rotates. Then, the rubber roller G rotates. Then, the multi-feed paper is separated by a force corresponding to the hysteresis torque.

Next, a procedure for bonding the permanent magnet 21 will be described. As shown in FIG.
The primer 1a is applied to the outer peripheral surface of No. 3 and dried. As the primer 1a, for example, a pretreatment agent for polyethylene and polypropylene (trade name: PR-550, manufactured by Alpha Giken Co., Ltd.) is preferable. The application may be performed by dipping (dipping) into a primer tank, by spraying (spraying), or by applying with a brush. According to the dipping, a large amount of processing can be performed in a short time. Spraying is relatively thin and easy to apply evenly. According to the brush, the coating thickness can be easily adjusted by the writing pressure. It is preferable to add a coloring agent to the primer 1a so that the color of the outer peripheral surface of the rotating shaft becomes different from the color before the treatment when the primer 1a is dried. Since the state of application can be seen at a glance by adding the colorant, it is possible to prevent work errors such as uneven application and forgetting to apply.

Next, as shown in FIG. 2B, an adhesive is applied to the outer peripheral surface of the rotating shaft 3 which has been subjected to the primer treatment (the reference numeral which is different from that before the treatment is given for distinction from the condition before the primer treatment). 2a is applied. As the adhesive 2a, for example, a cyanoacrylate adhesive (trade name: ALTECO)
88, manufactured by Alpha Giken Co., Ltd.). The viscosity of the adhesive 2a is low (for example, 60 cPs or less) when the clearance with the permanent magnet 21 is relatively small, and high (for example, 60 cPs) when the clearance is relatively large.
The above is preferred.

Next, as shown in FIG. 2C, the permanent magnet 21 is fitted and pushed down. Here, the permanent magnet 21
Is not magnetized. The reason is to prevent the permanent magnet 21 waiting for the curing of the adhesive 2a from mutually adsorbing to the other permanent magnets (21) and from adsorbing the surrounding magnetic powder. That is, when the permanent magnet 21 mutually attracts to the other permanent magnet (21), the uncured adhesive 2a
It is necessary to prevent this, since the pressure applied to the pressure becomes uneven. However, in order to prevent the magnetized permanent magnets from being attracted to each other, they need to be separated from each other, requiring a large space, which is inconvenient to handle. In addition, if the magnetized permanent magnet 21 adsorbs the surrounding magnetic powder, it hinders smooth rotation, which must be removed later, which increases the management burden.

As shown in FIG. 2D, when the adhesive 2a is cured, the permanent magnet 21 is bonded to the rotating shaft 3 via the adhesive layer 2. The thickness L of the adhesive layer 2 is, for example, 3
It is about 0 μm to 100 μm. After this, the permanent magnet 21
Is multipolar magnetized.

It is preferable that after the outer peripheral surface of the rotating shaft 53 is subjected to the primer treatment, the primer treated surface is further subjected to a heat treatment before the adhesive 2a is applied. By heating the primer-treated surface, the primer is activated, the effect of modifying the surface of the outer peripheral surface of the rotating shaft 3 is improved, and the bond between the rotating shaft 3 and the adhesive layer 2 becomes stronger.
For example, in FIG. 2A, after the primer 1a is dried, the rotating shaft 3 is put into a heating furnace, and the temperature is set to 30 ° C.
By performing the heat treatment at a temperature of 10 ° C. for 10 minutes to 1 hour, the effect of modifying the surface of the outer peripheral surface of the rotating shaft 3 is improved. Thereafter, the rotary shaft 3 is air-cooled, and then the adhesive 2a is applied to the outer peripheral surface of the rotary shaft 3. Note that the heat treatment is performed on the permanent magnet 21.
May be performed after being fitted on the rotating shaft 3.

Further, the outer peripheral surface of the rotating shaft 53 may be roughened in advance, or a dot-shaped or groove-shaped concave portion may be formed. With this configuration, when the adhesive 2a is hardened, the hardened adhesive enters the concave portion on the outer peripheral surface of the rotary shaft.
Bond becomes stronger. Also, the permanent magnet 21
When this is fitted over the outer peripheral surface of the rotating shaft 3, the concave portion serves as a liquid pool for the adhesive 2 a, so that the excess adhesive 2 a
Can be prevented from having an adverse effect such as fluctuation of torque value and occurrence of rotational unevenness due to protruding from the bonding surface.

According to the above-described coaxial cylindrical torque limiter 100, since the chemical bond is formed between the outer peripheral surface of the primer-treated rotating shaft 3 and the adhesive layer 2, the rotating shaft 3 made of synthetic resin is formed. The permanent magnet 21 is firmly adhered to the outer peripheral surface of the, and the peeling of the permanent magnet 21 is prevented, and the reliability as a torque limiter is improved. Further, since the rotating shaft 3 made of synthetic resin is used, excellent slidability is obtained. In particular, since one of the rotating shaft 3 and the rotating cylinder 32 is made of a polyolefin resin and the other is made of a polyacetal resin, it has excellent slidability. Furthermore, since it is not a composite of a synthetic resin and a metal material, there is no need for manufacturing.

Second Embodiment A procedure for bonding the permanent magnet 21 according to a second embodiment will be described. As shown in FIG.
The primer 1a is applied to the outer peripheral surface of No. 3 and dried. Next, as shown in FIG. 3B, the adhesive 2a is applied linearly in the axial direction on the outer peripheral surface of the rotating shaft 3 that has been subjected to the primer treatment. At this time, if the side on which the permanent magnet 21 is to be covered is applied slightly thicker, and the opposite side is reduced, the adhesive 2a
This is preferable because it is easy to suppress protrusion. Next, FIG.
As shown in (c), the non-magnetized permanent magnet 21 is fitted and pushed down while rotating several times. Then, as shown in FIG. 3D, when the adhesive 2a is cured, the permanent magnet 21 is bonded to the rotating shaft 3 via the adhesive layer 2.
After that, the outer peripheral surface of the permanent magnet 21 is multipolar magnetized. In addition,
As shown in FIG. 4, the adhesive 2a may be applied in a ring shape in the circumferential direction of the rotating shaft 3. According to the above-described second embodiment, the adhesive 2a only needs to be applied to a part of the outer peripheral surface of the rotating shaft 3, so that the labor of the operation can be reduced. Further, the protrusion of the adhesive 2a can be suppressed. When the adhesive 2a is applied to the entire outer peripheral surface of the rotating shaft 3,
When the amount of the adhesive 2a applied becomes excessive, the amount of protrusion tends to increase.

[0029]

According to the method of manufacturing the coaxial cylindrical torque limiter and the coaxial cylindrical torque limiter of the present invention, the outer peripheral surface of the synthetic resin rotating shaft or the inner peripheral surface of the rotating cylinder is subjected to a surface treatment with a primer. Since the permanent magnet is adhered by applying an adhesive, the permanent magnet can be firmly adhered to a synthetic resin which is difficult to adhere. Further, since a rotating shaft or a rotating cylinder made of a synthetic resin is used, excellent slidability can be obtained. further,
Since it is not a composite of a synthetic resin and a metal material, no labor is required for manufacturing. Therefore, the reliability and durability as a torque limiter can be improved.

[Brief description of the drawings]

FIG. 1 is an end view of a reverse roller for preventing double feeding of a sheet feeding device using a coaxial cylindrical torque limiter according to a first embodiment.

FIG. 2 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft.

FIG. 3 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a second embodiment.

FIG. 4 is an explanatory view showing another application mode of the adhesive.

FIG. 5 is an end view showing an example of a reverse roller for preventing double feed of a paper feeder using a conventional coaxial cylindrical torque limiter.

FIG. 6 is another explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Coaxial cylindrical torque limiter 1a Primer 2 Adhesive layer 2a Adhesive 3 Rotating shaft 3a Metal shaft 21 Permanent magnet 22 Semi-hard magnetic material 32 Rotating cylinder 32a Lid A Gap G Rubber roller M Sliding part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-237943 (JP, A) JP-A-6-302426 (JP, A) JP-A-7-284196 (JP, A) JP-A-2- 125178 (JP, A) JP-A-9-56090 (JP, A) JP-A-6-305045 (JP, A) JP-A-6-221341 (JP, A) JP-A-3-321 (JP, U) Japanese Utility Model Application Hei 4-19941 (JP, U) Registered utility model 3038928 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 7/02 F16D 27/01

Claims (7)

(57) [Claims] A cylindrical permanent magnet is adhered to an outer peripheral surface of a synthetic resin rotary shaft or an inner peripheral surface of a rotary cylinder, and the permanent magnet is formed on an outer peripheral surface of the rotary shaft or an inner peripheral surface of the rotary cylinder. The semi-hard magnetic body in a cylindrical shape is fixed to the non-adhered side, and the rotating shaft and the rotating cylinder are so arranged that the permanent magnet and the semi-hard magnetic body can be opposed to each other with a gap and can rotate relatively. A method for manufacturing a coaxial cylindrical torque limiter that is arranged coaxially and transmits rotation between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the permanent magnet and the semi-hard magnetic material, Outer peripheral surface of a rotating shaft made of synthetic resin or the synthetic resin
A method for producing a coaxial cylindrical torque limiter, comprising applying an adhesive to the inner peripheral surface of the rotary cylinder, applying an adhesive, and bonding the permanent magnet. 2. The method for manufacturing a coaxial cylindrical torque limiter according to claim 1, wherein said primer-treated surface is further heated. 3. The method of manufacturing a coaxial cylindrical torque limiter according to claim 1, wherein the color of the outer peripheral surface of the rotary shaft or the inner peripheral surface of the rotary cylinder after the primer treatment is changed to a primer. A method for manufacturing a coaxial cylindrical torque limiter, wherein a color different from a color before processing is obtained. 4. The method of manufacturing a coaxial cylindrical torque limiter according to claim 1, wherein an adhesive is applied only to a part of the primer-treated surface, and the permanent magnet is mounted thereon. A method for manufacturing a coaxial cylindrical torque limiter, wherein the adhesive is spread while being fitted while being rotated. 5. The method for manufacturing a coaxial cylindrical torque limiter according to claim 1, wherein a cyanoacrylate-based adhesive is used as an adhesive. Method. 6. A cylindrical permanent magnet is bonded to an outer peripheral surface of a rotating shaft made of synthetic resin or an inner peripheral surface of a rotating cylinder with an adhesive,
A cylindrical semi-hard magnetic body is fixed to the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotary cylinder, to which the permanent magnet is not bonded, and the permanent magnet and the semi-hard magnetic body are opposed to each other with a gap. The rotating shaft and the rotating cylinder are arranged coaxially so as to be able to rotate relative to each other, and a hysteresis torque generated between the permanent magnet and the semi-hard magnetic body causes the rotating shaft and the rotating cylinder to rotate. In a coaxial cylindrical torque limiter for transmitting rotation between, the outer peripheral surface of the synthetic resin rotary shaft or the synthetic resin
The inner peripheral surface of the rotating cylinder is subjected to a primer treatment, and a chemical bond is formed between the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotating cylinder and the adhesive that has been subjected to the primer treatment. Coaxial cylindrical torque limiter. 7. The coaxial cylindrical torque limiter according to claim 6, wherein one of the synthetic resin-made rotary shaft and the rotary cylinder is made of a polyolefin resin or a polyacetal resin, and the other is made of a polyacetal resin or a polyolefin. A coaxial cylindrical torque limiter characterized by being made of resin.