JP2008025777A - Part slip-off prevention mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a part slip-off prevention mechanism hardly allowing a part to slip off during use and operation in a torque limiting mechanism and a reverse rotation prevention mechanism of a rotating body. <P>SOLUTION: A torque limiting mechanism or a reverse rotation prevention mechanism of a rotating body 12A is interposed between a shaft 3 and a rotating body 12 freely rotatably supported in the shaft 3, slides with respect to the inner peripheral surface of a rotating body 12A when a rotating force acts on the rotating body 12A and includes a rotation regulation member 13 made of elastic material for limiting rotation torque. A bracket 14 for supporting the rotation regulation member 13 in a shaft is provided thereon. The bracket 14 is equipped with a fixed part 15 fixed to a shaft 3a and a holding part 16 which extends along in an axial direction of the shaft 3a and holds the rotation regulation member 13. By inserting the holding part 16 inside the rotating body 12A, the rotation regulation member 13 slides with respect to the inner peripheral surface of the rotating body 12A. A projecting part projected toward the inside is provided on the inner peripheral surface on an insertion direction side of the holding part 16 rather than the inner peripheral surface of the rotating body 12A on which the rotation regulation member 13 slides. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a component retaining mechanism in a reverse rotation preventing mechanism or a torque limiting mechanism of a rotating body.

  2. Description of the Related Art Generally, a copier, a printer, a facsimile machine, or the like has a roller having a reverse rotation prevention mechanism that allows only rotation in one direction and prevents rotation in a reverse direction, in a paper feed mechanism that feeds paper. .

  As this reverse rotation prevention mechanism, a mechanism having a bearing structure in which a plurality of rollers arranged at intervals in the circumferential direction is urged in one direction by a spring between a shaft and a rotating body is known. (For example, refer to Patent Document 1).

  And in this reverse rotation prevention mechanism, rotation in one direction of the rotating body with respect to the shaft is allowed, but when the rotational force in the other direction acts on the rotating body, the roller moves against the biasing force of the spring, The rotating body engages with the shaft by this roller, and rotation in the other direction with respect to the shaft is prevented.

Also, in paper feeding devices such as copiers, printers, and facsimiles, a torque limiting mechanism is provided that prevents double paper feed and reverses the paper feed mechanism to remove jammed paper when a paper jam occurs. There is also a roller (see, for example, Patent Document 2).
JP 11-63028 A Japanese Patent No. 3456882

  However, the reverse rotation prevention mechanism and the torque limiting mechanism according to the prior art as described above have a problem that the cost is high and the assembly / disassembly is difficult because of the complicated structure with many parts. .

  As a problem to be solved by the present invention, a reverse rotation prevention mechanism that solves the above-described problems of the conventional reverse rotation prevention mechanism and torque limiting mechanism, is easy to assemble with a small number of parts, and a simple structure. Another example is to provide a reverse rotation preventing mechanism or a torque retaining mechanism component retaining mechanism that is difficult to remove components during use / operation with respect to the torque limiting mechanism.

The component retaining mechanism according to claim 1 is interposed between a shaft and a rotating body rotatably supported by the shaft, and when a rotational force acts on the rotating body, A component anti-removal mechanism in a reverse rotation prevention mechanism or a torque limit mechanism of a rotating body that includes a rotation restricting member made of an elastic material that slides on a peripheral surface and restricts rotational torque,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
The inner peripheral surface on the insertion direction side of the holding portion is provided with a convex portion that protrudes inward from the inner peripheral surface of the rotating body on which the rotation regulating member slides.

The component retaining mechanism according to claim 6 is interposed between a shaft and a rotating body rotatably supported by the shaft, and when a rotational force acts on the rotating body, A component anti-removal mechanism in a reverse rotation prevention mechanism or a torque limit mechanism of a rotating body that includes a rotation restricting member made of an elastic material that slides on a peripheral surface and restricts rotational torque,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
The rotating body has an inner diameter that narrows toward an end portion on a side where the rotation restricting member is inserted.

The component retaining mechanism according to claim 7 is interposed between a shaft and a rotating body rotatably supported by the shaft, and when a rotational force acts on the rotating body, A component anti-removal mechanism in a reverse rotation prevention mechanism or a torque limit mechanism of a rotating body that includes a rotation restricting member made of an elastic material that slides on a peripheral surface and restricts rotational torque,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
A claw portion is provided at the tip of the holding portion,
The claw portion is caught on an end portion of the feed roller, and the bracket is locked so as not to be detached from the feed roller and the rotating body.

First, description will be given of the reverse rotation prevention mechanism that the inventor has previously filed as Japanese Patent Application No. 2005-114639 with reference to FIGS.
In the reverse rotation prevention mechanism shown in FIGS. 1 to 7, for example, a rotation restricting member is attached to a shaft that rotatably supports a rotating body such as a feed roller of a printing press. When rotational force in the rotational direction acts on the rotating body, it slides on the inner peripheral surface of the rotating body to allow rotation, and when rotational force in the reverse rotational direction with respect to the shaft acts on the rotating body In addition, it is in close contact with the inner peripheral surface of the rotating body to prevent rotation.

1 and 2 are schematic configuration diagrams of a sheet feeding mechanism having a roller provided with a reverse rotation prevention mechanism of Japanese Patent Application No. 2005-114639.
As shown in FIG. 1, the paper feeding mechanism brings the pickup roller 1 into contact with the upper surface of the stacked paper P, and then feeds the paper P one by one by the feed roller 3 facing the retard roller 2. Furthermore, as shown in FIG. 2, it has the structure conveyed by being pinched by a pair of sending-out rollers 4. As shown in FIG.

  Here, the feed roller 3 only rotates in one direction so that the paper P is delivered to the feed roller 4 and the rotation of the shaft 3a is stopped, and then the feed roller 3 is rotated by the paper P fed by the feed roller 4. A reverse rotation prevention mechanism that allows and prevents rotation in the reverse direction is provided.

Next, the reverse rotation prevention mechanism will be described in detail.
3 is a perspective view showing a reverse rotation prevention mechanism for a rotating body in this embodiment, FIG. 4 is an exploded perspective view for explaining the configuration of the reverse rotation prevention mechanism, and FIG. 5 is for explaining the structure of the reverse rotation prevention mechanism. FIG. 6 is a cross-sectional view, FIG. 6 is a plan view of a part of a feed roller provided with a reverse rotation prevention mechanism, and FIG. 7 is a cross-sectional view illustrating the operation of the reverse rotation prevention mechanism.
As shown in FIGS. 3 to 6, the feed roller 3 is provided with a reverse rotation prevention mechanism 11 on a side portion thereof.

  The reverse rotation prevention mechanism 11 includes a cylindrical rotating body 12 connected and fixed to the feed roller 3, a rotation regulating member 13 attached to the shaft 3 a of the feed roller 3 inserted through the center of the rotating body 12, and The rotation restricting member 13 has a bracket 14 that supports the shaft 3a.

  The bracket 14 is formed in an L shape in a sectional view having a fixing portion 15 fixed to the shaft 3 a and a holding portion 16 extending laterally at one end of the fixing portion 15.

An engagement hole 17 is formed in the bracket 14 near the end of the fixed portion 15. The bracket 14 is engaged with the engagement hole 17 in a state in which the fixing portion 15 is inserted into the mounting hole 18 formed in the shaft 3a and the end portion protrudes to the opposite side of the shaft 3a. The pin 19 is fitted and locked to be attached to the shaft 3a.
The rotation restricting member 13 is held by holding the base end portion between the holding portion 16 of the bracket 14 and the shaft 3a.

  The rotation restricting member 13 is made of, for example, an elastic material such as various rubbers, elastomers, sponges, or composites thereof, synthetic leather, leather, cloth, non-woven fabric, or cast (urethane etc.). From the held base end portion toward the tip end portion, the shaft 3a extends in the normal rotation direction α and is curved. A part of the rotation restricting member 13 is slidably contacted with the inner peripheral surface of the rotating body 12.

  And in the reverse rotation prevention mechanism 11 of the said structure, as shown to Fig.7 (a), when the shaft 3a rotates to the normal rotation direction (alpha), a part will contact the internal peripheral surface of the rotary body 12 with the rotational force. The rotation regulating member 13 is pressed against and closely contacts the inner peripheral surface of the rotating body 12 while being elastically deformed.

  Thereby, the rotating body 12 is rotated in the forward rotation direction α together with the shaft 3a by the rotation restricting member 13, and the feed roller 3 to which the rotating body 12 is connected and fixed is rotated in the forward rotation direction α.

  Further, as shown in FIG. 7B, when a rotational force in the positive rotation direction α is applied to the feed roller 3 in a state where the shaft 3a is stopped, the rotary body 12 is also positively rotated in the positive rotation direction α. The rotational force toward is transmitted. Thus, when the rotational force which goes to the normal rotation direction (alpha) acts on the rotary body 12, the rotary body 12 rotates toward the normal rotation direction (alpha) with respect to the shaft 3a which has stopped. That is, the rotation restricting member 13 is curved by extending in the positive rotation direction α from the base end portion toward the tip end portion, so that it is pressed against the inner peripheral surface of the rotating body 12 even when the rotating body 12 rotates. Without being in close contact with each other, and will slide slightly in contact with the inner peripheral surface of the rotating body 12.

  Thereby, the feed roller 3 rotates in the normal rotation direction α together with the rotating body 12 in a state where the shaft 3 a is stopped.

  Further, as shown in FIG. 7C, when a rotational force in the reverse rotation direction β is applied to the feed roller 3 while the shaft 3a is stopped, the rotary body 12 is also reversely rotated in the reverse rotation direction β. The rotational force toward is transmitted. As described above, when a rotational force in the reverse rotational direction β is applied to the rotating body 12, the rotation restricting member 13 that is partially in contact with the inner peripheral surface of the rotating body 12 is elastically deformed by the rotational force. The inner surface of the rotating body 12 is pressed and is in close contact. At this time, the deformation of the rotation restricting member 13 in the reverse rotation direction β side is restricted by the holding portion 16 of the bracket 14, and a good adhesion state of the rotation restricting member 13 to the rotating body 12 is maintained.

  Thereby, the rotating body 12 is integrated with the stopped shaft 3a by the rotation restricting member 13, and is prevented from rotating in the reverse rotation direction β.

  Thus, according to the reverse rotation prevention mechanism 11 described above, the rotation restricting member 13 made of an elastic body that prevents the rotation body 12 from rotating in the reverse rotation direction β with respect to the shaft 3a has a simple configuration. Therefore, the cost can be reduced, and the assembly and disassembly can be facilitated, whereby the internal consumable parts can be easily replaced.

  In the above-described reverse rotation prevention mechanism, the shape of the holding portion of the bracket and the combination of the shape of the holding portion and the shape of the rotation restricting member can be used in various shapes, and the friction coefficient is changed by changing these shapes. be able to.

In addition, the friction coefficient can be changed by changing the state and shape of the surface of the rotation restricting member, applying a surface treatment to the surface that the rotation restricting member contacts.
By changing the friction coefficient, the rotational torque can be adjusted with respect to the left and right rotations, so that a torque limiter function, a damper function, and a reverse rotation prevention function can be realized.

  In other words, not only the reverse rotation prevention mechanism that allows rotation in one direction and prevents rotation in the reverse direction, but also does not give resistance to rotation in one direction, and provides a predetermined resistance to rotation in the reverse direction. It is also possible to realize a torque limiting mechanism having a torque limiter function for limiting the torque of rotation in the reverse direction, or a damper function for giving a predetermined resistance to rotation in both directions.

  A device having a damper function can be used for, for example, a hinge and the like, and the opening / closing operation is slowly and smoothly performed in an opening / closing portion that is not suitable for sudden opening / closing in an OA device, an acoustic device, a housing device, a home appliance, etc. be able to.

  The one having a torque limiter function may be used, for example, in a double feed prevention mechanism for preventing so-called “double feed” in which a plurality of papers are simultaneously sandwiched and fed in the paper feed mechanism shown in FIGS. it can.

  By the way, in the reverse rotation preventing mechanism 11 described above, the rotation restricting member 13 may be displaced in the axial direction of the shaft 3 a during operation, and may be detached from the inner periphery of the rotating body 12. For this reason, it is necessary to provide unevenness on the bracket 14 and the rotating body 12 to provide a retaining function. However, when this unevenness comes into contact or interferes, the slidability of the rotating body is impaired.

  Thus, in order to prevent the unevenness provided on the bracket 14 and the rotating body 12 from contacting or interfering with each other, a useless space is required, and the outer diameter and inner diameter thereof are increased.

  In the reverse rotation prevention mechanism (or torque limiting mechanism) as described above, the component retaining mechanism according to the embodiment of the present invention is easy to assemble with a simple structure with a small number of components, and during use and operation. It is intended to obtain a component retaining mechanism in a reverse rotation preventing mechanism or torque limiting mechanism of a rotating body that is difficult to remove components.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a component anti-retraction mechanism in a reverse rotation prevention mechanism or torque limiting mechanism for a rotating body according to the present invention will be described below in detail with reference to specific examples.
In each of the following embodiments, the component retaining mechanism in the reverse rotation preventing mechanism will be described, but the component retaining mechanism in the torque limiting mechanism that realizes the torque limiter function or the damper function has the same configuration. .

(Example 1)
FIG. 8 is an exploded perspective view illustrating Example 1 of the component retaining mechanism in the reverse rotation preventing mechanism according to the embodiment of the present invention, FIG. 9 is a cross-sectional view after assembly, and FIG. It is principal part sectional drawing of FIG.

  As shown in FIG. 8, the rotating body 12 </ b> A in the component retaining mechanism 11 </ b> A in the reverse rotation preventing mechanism of this embodiment includes an outer shell portion 21 and a retaining portion 22 of the rotating body. The outer shell portion 21 includes a convex portion 21 b for engaging with the feed roller 3 and a groove portion 21 a for engaging with the retaining portion 22. The retaining portion 22 includes a groove portion 22a for engaging with the outer shell portion 21, and the rotating body 12A is assembled by fitting the groove portion 22a of the retaining portion 22 and the groove portion 21a of the outer shell portion 21 together.

  Further, the groove 21a and the groove 22a are bonded and fixed with an adhesive or the like. Alternatively, one of the groove 21a and the groove 22a may be a male screw and the other may be a female screw, and may be screwed together.

  Further, the retaining portion 22 has an inner diameter ΦY of the end portion 22b on the side where the bracket 14 is inserted smaller than an inner diameter ΦX of the outer shell portion 21 of the rotating body 12A. That is, ΦX> ΦY. As a result, as shown in FIGS. 9 and 10, the cross section after assembly is formed with a convex portion toward the inside at the end of the rotating body 12A on the side where the bracket 14 is inserted.

  The bracket 14 has a structure in which a holding portion 16 is formed on a side surface of the fixing portion 15 and the base end portion of the rotation restricting member 13 is held between the holding portion 16 and the shaft 3a. In addition, the engagement pin 3b is attached to the shaft 3a, and the engagement pin 3b is engaged with the groove portion 15a of the bracket 14 press-fitted into the shaft 3a, so that the bracket 14 can be securely engaged with the shaft 3a without causing idle rotation. Can be fixed to.

  The rotating body 12 </ b> A can be engaged with the feed roller 3 by inserting the convex portion 21 b of the outer shell portion 21 into the groove 3 d provided in the rotating body engaging portion 3 c of the feed roller 3.

Next, the state before and after incorporating the rotation restricting member 13 into the rotating body 12A will be described with reference to FIGS.
FIG. 11 is a part of an exploded perspective view of the reverse rotation preventing mechanism according to the first embodiment of the present invention before the assembly of the component retaining mechanism, and FIG. It is a figure which shows the state of the rotation control member 13 before the assembly to the rotary body 12. FIG. FIG. 12B is a view taken in the direction of arrow B in FIG. 11 and shows a state of the rotation restricting member 13 when passing through the retaining portion 22. (C) of FIG. 12 is a C arrow view of FIG. 11, and is a view showing a state of the rotation restricting member 13 after being assembled.

  As shown in FIG. 12A, the rotation restricting member 13 before being incorporated into the rotating body 12 is attached to the holding portion 16 of the bracket 14 and protrudes in a substantially vertical direction with respect to the shaft 3a. As shown in FIG. 12B, the rotation restricting member 13 is forcibly folded and passed through the retaining portion 22.

  Then, as shown in FIG. 12C, the rotation restricting member 13 after being incorporated into the rotating body 12A tries to return to the original shape, and the inner wall 21c (inner diameter ΦX) of the outer shell portion 21 of the rotating body 12A. ). On the other hand, since the inner diameter ΦY of the end portion 22b of the retaining portion 22 is ΦX> ΦY as described above, a convex portion is formed inward, and the rotation restricting member 13 is hooked on the end portion 22b. 14 is difficult to be removed from the rotating body 12A.

  Therefore, the component retaining mechanism in the reverse rotation preventing mechanism according to the present embodiment has a small number of components and is easy to assemble with a simple structure, and the bracket 14 is not easily detached even after the bracket 14 is incorporated into the rotating body 12A.

Further, as a modification of the present embodiment, the convex portion of the retaining portion may be inserted inside. FIG. 13 is a cross-sectional view illustrating a main part of a modification of the present embodiment.
As shown in FIG. 13, the convex portion of the retaining portion 22 of this modification is provided so as to be put inside. Thereby, the contact area of the retaining portion 22 and the fixing portion 15 of the bracket 14 is reduced, and interference between the bracket 14 and the rotating body 12A can be suppressed.

  In the first embodiment and the modification of the first embodiment, the holding portion 16 of the bracket 14 is inserted without using the outer shell portion 21 and the retaining portion 22 of the rotating body 12A as separate members as described above. You may use the member of the integral structure in which the convex part is formed toward the inner side in the edge part of the side.

(Example 2)
14 is an exploded perspective view for explaining Example 2 of the component retaining mechanism in the reverse rotation preventing mechanism according to the embodiment of the present invention, and FIG. 15 is a cross-sectional view after assembly.
As shown in FIG. 14, the rotating body 12 </ b> B in the component retaining mechanism of this embodiment includes an outer shell portion 31 and a retaining portion 32 of the rotating body. The outer shell portion 31 includes a convex portion 31 b for engaging with the feed roller 3 and a groove portion 31 a for engaging with the retaining portion 32. The retaining portion 32 includes a claw portion 32a for engaging with the outer shell portion 31, and the rotating body 12B is assembled by hooking the claw portion 32a of the retaining portion 32 on the groove portion 31a of the outer shell portion 31.

  Further, the inner diameter ΦY of the retaining portion 32 is smaller than the inner diameter ΦX of the outer shell portion 31. That is, ΦX> ΦY as in the first embodiment. Thereby, as for the cross section after an assembly, as shown in FIG. 15, the convex part is formed toward the inner side in the edge part by the side of inserting the bracket 14 of the rotary body 12B.

  The bracket 14 has the same structure as that of the first embodiment. Similarly to the first embodiment, the rotating body 12B inserts the convex portion 21b of the outer shell portion 31 into the groove portion 3d provided in the rotating body engaging portion 3c of the feed roller 3 to thereby feed the feed roller 3B. Can be engaged.

  In the present embodiment, similarly to the first embodiment, a protrusion is formed on the retaining portion 32, and the rotation restricting member 13 is hooked on the protrusion, thus making it difficult for the bracket 14 to be detached from the rotating body 12B. Therefore, like the first embodiment, the component retaining mechanism 11B in the reverse rotation preventing mechanism according to the present embodiment has a small number of parts and is easy to assemble, and the bracket 14 is incorporated into the rotating body 12B. After that, the bracket 14 is difficult to come off.

  In addition, the component retaining mechanism 11B of the present embodiment has the claw portion 32a of the retaining portion 32 hooked on the groove portion 31a of the outer shell portion 31 so that the rotating body 12B is assembled. Also good. This eliminates the need for an adhesive or the like and a work process for bonding, thereby reducing the cost.

(Example 3)
FIG. 16 is a cross-sectional view of a main part of a component retaining mechanism example 3 in the reverse rotation preventing mechanism according to the embodiment of the present invention.
The reverse rotation prevention mechanism 11C according to the present embodiment is different in the structure of the rotating body 12C, and the other configuration is the same as that of the first embodiment, and the description thereof is omitted.

  The rotating body 12C in the present embodiment is an integral member, and a part of the inner peripheral surface of the rotating body 12C is located on the side where the bracket 14 is inserted from the side engaged with the feed roller 3, as shown in FIG. The inclined surface 12Ca is such that the inner side of the rotating body becomes narrower.

  As described above, since the inner side on the side where the bracket 14 is inserted is narrow, the rotation restricting member 13 is more strongly elastically deformed when the bracket 14 is pulled out, so that the bracket 14 is difficult to be removed from the rotating body 12C.

  Therefore, the component retaining mechanism in the reverse rotation preventing mechanism of this embodiment has a small number of components and is easy to assemble with a simple structure, and the bracket 14 is not easily detached even after the bracket 14 is incorporated into the rotating body 12C.

  Moreover, since it is an integral structure, the work process for attaching the retaining portion as in the first and second embodiments is unnecessary.

Example 4
FIG. 17 is an exploded perspective view for explaining Example 4 of the component retaining mechanism in the reverse rotation preventing mechanism according to the embodiment of the present invention, and FIG. 18 is a cross-sectional view after assembly.
As shown in FIG. 17, the component retaining mechanism 11D in the reverse rotation preventing mechanism of the present embodiment is composed of a rotating body 12D and a bracket 14D. The bracket 14 </ b> D is provided with a holding portion 16 </ b> D that extends along the axial direction of the shaft 3 a and holds the rotation restricting member 13 on the side surface of the fixing portion 15. The length of the holding portion 16D in the direction along the axial direction of the shaft 3a is set to be substantially the same as the length when the feed roller 3 and the rotating body 12D are coupled. A claw portion 26D is provided at the tip of the holding portion 16D.

  Further, the bracket 14D has a structure in which the base end portion of the rotation restricting member 13 is held between the holding portion 16D and the shaft 3a. Further, the engagement pin 3b is attached to the shaft 3a, and the engagement pin 3b is engaged with the groove portion 15a of the bracket 14D press-fitted into the shaft 3a, so that the bracket 14D can be securely connected to the shaft 3a without causing idle rotation. Can be fixed to.

  As shown in FIG. 18, the cross-section after the assembly is such that the claw 26D of the holding portion 16D is caught by the end 3d of the feed roller 3 and the bracket 14 is locked so as not to come off from the feed roller 3 and the rotating body 12D. Yes.

  Therefore, the component retaining mechanism in the reverse rotation preventing mechanism of the present embodiment has a small number of components and is easy to assemble with a simple structure, and the bracket 14D is not easily detached even after the bracket 14D is incorporated in the rotating body 12D.

  As described above in detail in each of the above embodiments, the component anti-retraction mechanism in the reverse rotation prevention mechanism or torque limiting mechanism of the rotating body according to the embodiment of the present invention is freely rotatable on the shaft 3a and the shaft 3a. It is interposed between the supported rotating body 12A (12B), and when the rotational force acts on the rotating body 12, it slides against the inner peripheral surface of the rotating body 12A (12B) to limit the rotational torque. It is a component retaining mechanism in the reverse rotation preventing mechanism or torque limiting mechanism of the rotating body 12A (12B) provided with the rotation restricting member 13 made of an elastic material, and has a bracket 14 that supports the rotation restricting member 13 on the shaft, The bracket 14 includes a fixing portion 15 that is fixed to the shaft 3a, and a holding portion 16 that extends along the axial direction of the shaft 3a and holds the rotation restricting member 13. The rotation restricting member 13 is configured to slide relative to the inner peripheral surface of the rotating body 12A (12B) by being inserted inside the rolling element 12A (12B), and the rotating restricting member 13 slides. A convex portion that is convex toward the inside is provided on the inner peripheral surface on the insertion direction side of the holding portion 16 with respect to the inner peripheral surface of 12A.

  Alternatively, the component retaining mechanism in the reverse rotation prevention mechanism or torque limiting mechanism of the rotating body according to the embodiment of the present invention is interposed between the shaft 3a and the rotating body 12C rotatably supported by the shaft 3a. When the rotational force is applied to the rotating body 12C, the rotating body 12C slides with respect to the inner peripheral surface of the rotating body 12C and includes the rotation restricting member 13 made of an elastic material that limits the rotational torque. This is a component retaining mechanism in the prevention mechanism or the torque limiting mechanism, and has a bracket 14 that supports the rotation restricting member 13 on the shaft. The bracket 14 is fixed to the shaft 3a and the axial direction of the shaft 3a. And a holding portion 16 that extends along the axis and holds the rotation restricting member 13, and the rotation restricting member 13 rotates by inserting the holding portion 16 inside the rotating body 12 </ b> C. 12C is configured to slide relative to the inner circumferential surface of the rotary body 12C is an inner diameter becomes narrower toward the end on the side of inserting the rotation regulating member 13.

  Alternatively, the component retaining mechanism in the reverse rotation preventing mechanism or torque limiting mechanism of the rotating body according to the embodiment of the present invention is interposed between the shaft 3a and the rotating body 12D rotatably supported by the shaft 3a. When the rotational force is applied to the rotating body 12D, the rotating body 12D slides with respect to the inner peripheral surface of the rotating body 12D and includes the rotation restricting member 13 made of an elastic material that limits the rotational torque. This is a component retaining mechanism in the prevention mechanism or the torque limiting mechanism, and includes a bracket 14D that supports the rotation restricting member 13 on the shaft. The bracket 14D includes a fixing portion 15 that is fixed to the shaft 3a and the axial direction of the shaft 3a. A holding portion 16D that extends along the axis and holds the rotation restricting member 13, and the rotation restricting member 1 is inserted by inserting the holding portion 16D inside the rotating body 12D. Is configured to slide with respect to the inner peripheral surface of the rotating body 12D, and a claw portion 26D is provided at the tip of the holding portion 16D. The claw portion 26D is hooked on the end portion 3d of the feed roller 3, and the bracket 14D is fed to the feed roller. 3 and the rotating body 12D.

According to the above embodiment of the present invention, when the reverse rotation preventing mechanism or the torque limiting mechanism is operated, some force is applied to cause the rotation restricting member 13 to move away from the rotating body 12A (12B, 12C, 12D). Occasionally, the rotation restricting member 13 has a structure in which the inner diameter becomes narrower toward the end portion on the side where the rotation restricting member 13 is inserted or the convex portion that protrudes toward the inside of the rotating body 12A (12B). Is caught and becomes difficult to come off. Alternatively, the configuration in which the claw portion 26D is hooked on the end portion 3d of the feed roller 3 makes it difficult for the rotation restricting member 13 to come off the rotating body 12D.
Further, since the rotation restricting member 13 is difficult to be removed from the rotating body 12A (12B, 12C, 12D), it is possible to prevent intrusion of foreign matters such as dust.
As a result, the reverse rotation prevention mechanism or torque limiting mechanism is easy to assemble with a simple structure with a small number of parts, and the components in the reverse rotation prevention mechanism or torque limiting mechanism of the rotating body that are difficult to disassemble during use and operation. A retaining mechanism can be obtained.

It is a schematic block diagram of the paper feed mechanism which has a feed roller. It is a schematic block diagram of the paper feed mechanism which has a feed roller. It is a perspective view which shows the basic structure of the reverse rotation prevention mechanism or torque limiting mechanism of a rotary body. It is a disassembled perspective view explaining the structure of FIG. It is sectional drawing explaining the basic structure of the reverse rotation prevention mechanism or torque limiting mechanism of a rotary body. It is the top view which looked at a part of feed roller provided with the basic structure of the reverse rotation prevention mechanism or torque limiting mechanism of a rotary body. It is sectional drawing explaining the effect | action of the basic structure of the reverse rotation prevention mechanism or torque limiting mechanism of a rotary body. It is a disassembled perspective view explaining Example 1 of the component retaining mechanism according to the embodiment of the present invention. 2 is a cross-sectional view after assembly of Example 1. FIG. 1 is a cross-sectional view of a main part of Example 1. FIG. FIG. 3 is a part of an exploded perspective view of the first embodiment. FIG. 11 is a view (a) in FIG. 11 (a), a view in arrow B (b) in FIG. 11, and a view in arrow C (c) in FIG. 6 is a cross-sectional view illustrating a main part of a modified example of Example 1. FIG. FIG. 6 is an exploded perspective view for explaining Example 2; FIG. 6 is a cross-sectional view after assembly of Example 2. 10 is a cross-sectional view of a main part of Example 3. FIG. FIG. 6 is an exploded perspective view illustrating Example 4; FIG. 6 is a cross-sectional view after assembly of Example 4.

Explanation of symbols

3a Shaft 11 Reverse rotation prevention mechanism (torque limiting mechanism)
11A, 11B, 11C, 11D Component retaining mechanism 12, 12A, 12B, 12C, 12D Rotating body 13 Rotation restricting member 14, 14D Bracket 15 Fixed portion 16, 16D Holding portion 21, 31 Outer shell portion 22, 32 Retaining portion 26D, 32a Claw

Claims (7)

It is interposed between a shaft and a rotating body that is rotatably supported by the shaft, and slides with respect to the inner peripheral surface of the rotating body when a rotational force acts on the rotating body. A component anti-removal mechanism in a reverse rotation preventing mechanism or torque limiting mechanism of a rotating body provided with a rotation restricting member made of an elastic material to be restricted,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
A component retaining mechanism comprising a convex portion that protrudes inward on an inner peripheral surface closer to an insertion direction of the holding portion than an inner peripheral surface of the rotating body on which the rotation restricting member slides. . The rotating body includes an outer shell portion and a retaining portion having an inner diameter smaller than the inner peripheral diameter of the outer shell portion,
The component retaining mechanism according to claim 1, wherein the convex portion is formed by adhering the annular retaining portion to an end portion of the outer shell portion. The rotating body includes an outer shell portion and a retaining portion having an inner diameter smaller than the inner peripheral diameter of the outer shell portion,
2. The component retaining mechanism for a rotating body according to claim 1, wherein the annular retaining portion is screwed into an end portion of the outer shell portion to form the convex portion. The rotating body includes an outer shell portion having a groove portion on an outer peripheral surface, and a retaining portion having an inner diameter smaller than the inner peripheral diameter of the outer shell portion and having a claw portion,
The component retaining mechanism according to claim 1, wherein the protrusion is formed by engaging the claw portion and the groove portion.   2. The component retaining mechanism according to claim 1, wherein the convex portion is formed as an integral structure on an inner peripheral surface of the rotating body. It is interposed between a shaft and a rotating body that is rotatably supported by the shaft, and slides with respect to the inner peripheral surface of the rotating body when a rotational force acts on the rotating body. A component anti-removal mechanism in a reverse rotation preventing mechanism or torque limiting mechanism of a rotating body provided with a rotation restricting member made of an elastic material to be restricted,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
The component retaining mechanism according to claim 1, wherein an inner diameter of the rotating body becomes narrower toward an end portion on a side where the rotation restricting member is inserted. It is interposed between a shaft and a rotating body that is rotatably supported by the shaft, and slides with respect to the inner peripheral surface of the rotating body when a rotational force acts on the rotating body. A component anti-removal mechanism in a reverse rotation preventing mechanism or torque limiting mechanism of a rotating body provided with a rotation restricting member made of an elastic material to be restricted,
A bracket for supporting the rotation restricting member on the shaft;
The bracket includes a fixing portion that is fixed to the shaft, and a holding portion that extends along an axial direction of the shaft and holds the rotation restricting member,
The rotation restricting member is configured to slide with respect to the inner peripheral surface of the rotating body by inserting the holding portion inside the rotating body,
A claw portion is provided at the tip of the holding portion,
The component retaining mechanism, wherein the claw portion is caught by an end portion of the feed roller, and the bracket is locked so as not to be detached from the feed roller and the rotating body.