JP3060949U - Mounting structure for resin bearings - Google Patents

Abstract

(57) [Problem] To improve the positional accuracy and mounting stability of a bearing in a mounting structure of a resin bearing used for supporting a rotary shaft such as a feed roller shaft of a printer. A mounting plate (B) has a circular mounting hole (21) and an engagement hole (22) near the mounting hole (21). By fitting the cylindrical portion 9 of the bearing A into which the rotary shaft 1 is inserted into the mounting hole portion 21, the entire peripheral portion of the cylindrical portion 9 is attached to the mounting hole portion 2.
1 to make contact with the edge of the hole. The mounting plate B is sandwiched between the flange 10 on the side of the cylindrical portion 9 and the engagement claws 12 provided on the flange 10 via the protruding pieces 11.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is used to rotatably support a resin bearing mounting structure, more specifically, a rotating shaft such as a feed roller shaft of a printer or a paper discharging roller shaft, or a rotating shaft used in various other devices. It relates to the mounting structure of resin bearings used.

[0002]

[Prior art]

 Japanese Patent Application Laid-Open No. 6-323328 discloses that a resin bearing is used to support a rotating shaft of a paper feed roller of a product having a paper transport mechanism. It describes that a rotating shaft of a roller of a copying machine or a printer is supported by a resin bearing member. Japanese Utility Model Publication No. 5-28047 describes a structure in which a bearing member for supporting a rotary shaft is inserted and fitted into a notch formed in a frame of a printer.

On the other hand, FIGS. 6 to 8 show a conventional resin bearing (hereinafter referred to as a “bearing”) A for supporting a rotating shaft 1 used as a feed roller shaft of a printer. The mounting structure is shown. 6 and 7, the bearing A is divided into one end and the other end in the axial direction of the cylindrical portion 2 into which the rotating shaft 1 is rotatably inserted. A front flange portion 3 and a rear flange portion 4 are protruded toward the direction. The front flange portion 3 is formed by a pair of substantially rectangular protrusions projecting in opposite directions from two opposite positions in the circumferential direction of the cylindrical portion 2 and having a width W1 shorter than the diameter length D of the cylindrical portion 2. Have been. The rear flange 4 also protrudes from two opposite locations in the circumferential direction of the cylinder 2 in opposite directions and has a pair of substantially rectangular projections having a width W2 shorter than the diameter D of the cylinder. Is formed. The direction in which the front flange 3 protrudes from the tube 2 and the direction in which the rear flange 4 protrudes differ by an angle of 90 degrees.

[0004] A mounting plate B such as a chassis to which the bearing A is mounted is provided with a mounting hole 5 formed by combining a circular hole and rectangular holes protruding on both sides of the circular hole. The overall shape of the mounting hole 5 is similar to the contour formed by the cylindrical portion 2 and the front flange 3 of the bearing A. When mounting the bearing A to the mounting plate B using the mounting hole 5, after inserting the cylindrical portion 2 and the front flange portion 3 of the bearing A into the mounting hole 5, as shown by an arrow a in FIG. Then, the bearing A is rotated by a predetermined angle. By doing so, the cylindrical portion 2 is supported by the mounting hole portion 5 and the front flange portion 3 and the rear flange portion 4 sandwich the mounting plate B, whereby the bearing A is mounted on the mounting plate B. . In the bearing A shown in the figure, a plate piece 6 projecting radially outward is continuously provided on one side of the rear flange part 4, and a projection 8 provided on the plate piece 6 is attached to the mounting plate B. The bearing A is positioned at a predetermined position in the rotation direction of the rotary shaft 1 by being fitted into the provided concave portion 7.

[0005]

[Problems to be solved by the invention]

 The conventional mounting structure described with reference to FIG. 7 has the following problems. That is, as shown in FIG. 8, the cylindrical portion 2 of the bearing A is positioned only by the pair of arc portions 5a, 5a provided in the mounting hole portion 5 in the facing state. The rectangular portions 5b, 5b of the portion 5 do not contribute to the positioning of the cylindrical portion 2. In other words, since the cylindrical portion 2 is not positioned at the entire circumference thereof, but is positioned only at two locations on the opposite side in the circumferential direction, the bearing A and the mounting plate are mounted after the mounting. There is a problem that rattling in the direction of arrow X in FIG. Then, if rattling occurs between the bearing A and the mounting plate B after the mounting, the positional accuracy of the bearing A is reduced, and the rotational accuracy of the rotary shaft 1 is reduced. In this case, the amount of paper transported varies, and printing accuracy is adversely affected.

[0006] The above problems can be completely solved by the techniques described in JP-A-6-323328, JP-A-8-151141, Japanese Utility Model Publication No. 5-28047, and the like listed at the beginning. Can not do.

[0007] The present invention has been made in view of the above-described problem, and the bearing mounting workability is substantially the same as the conventional workability despite the fact that the cylindrical portion of the bearing can be positioned around the entire circumference thereof. It is an object of the present invention to provide a resin bearing mounting structure that can be secured.

[0008]

[Means for Solving the Problems]

 The mounting structure of the resin bearing according to the present invention is provided on a mounting plate having a circular mounting hole and an engaging hole located at a distance from the mounting hole at a location near the mounting hole. The cylindrical portion of the bearing into which the rotating shaft is rotatably inserted is fitted into the mounting hole, and the entire peripheral portion of the cylindrical portion is in contact with the hole edge of the mounting hole, and is provided in the cylindrical portion. The mounting plate is sandwiched between the provided flange portion and an engaging claw provided at the tip of a protruding piece extending from the flange portion and inserted into the engaging hole.

According to this mounting structure, since the entire peripheral portion of the cylindrical portion of the bearing is in contact with the hole edge of the mounting hole, the cylindrical portion of the bearing is positioned at the entire peripheral portion by the hole edge of the mounting hole. You. This eliminates rattling between the bearing and the mounting plate after the bearing is mounted, and improves the positional accuracy and mounting stability of the bearing. Further, since the mounting plate is sandwiched by the flange provided on the cylindrical portion and the engaging claw provided at the tip of the protruding piece extending from the flange and inserted into the engaging hole, The tube does not fall out of the mounting hole.

In the mounting structure, a pair of the engaging holes are distributed on both sides of the mounting plate with the mounting hole interposed therebetween, and the cylinder is provided in each of the pair of the engaging holes. The pair of projecting pieces, which are distributed to both sides sandwiching the portion and extend from the flange, are inserted separately, and the mounting plate is formed by the engagement claws and the flange provided on each of the projecting pieces. It is desirable that the mounting hole is held on both sides of the mounting hole. With this configuration, the holding portion of the mounting plate between the engaging claw and the flange portion is located on both sides of the cylindrical portion fitted in the mounting hole portion, so that the mounting stability of the bearing is improved. Is even better.

Further, the engagement hole portion may be formed in an arc shape concentric with the mounting hole portion, and the engagement hole portion may include a wide portion through which the engagement claw is inserted and withdrawn. Good. In this case, it is desirable to provide a pair of engagement holes and wide portions.

[0012] According to this structure, by rotating the bearing, the protruding piece is moved by the arc-shaped engaging hole, and thereby the engaging claw can be positioned at the wide portion. Then, when the engaging claw is pulled out through the wide portion from the state where the engaging claw is located at the wide portion, the bearing is removed from the mounting plate. When the bearing is mounted on the mounting plate, after inserting the engaging claw into the wide portion, the bearing may be rotated in the opposite direction to move the protruding piece into the arc-shaped engaging hole. By doing so, the mounting plate is sandwiched between the engagement claws and the flange, and the bearing is mounted on the mounting plate.

The bearing is provided with a plate piece protruding along the plate surface of the mounting plate, and a projection provided on the plate piece is fitted into a positioning recess formed on the mounting plate. It is desirable to have With this configuration, the bearing is positioned in the circumferential direction of the cylindrical portion.

In the present invention, the rotating shaft rotatably inserted into the cylindrical portion of the bearing may be, for example, a feed roller shaft of a printer. In a printer, the feed roller shaft is a member that exerts the paper transport function.If the rotation axis is the feed roller shaft of the printer, as described above, the printing accuracy is improved through the improvement in bearing position accuracy and mounting stability. Will be achieved.

[0015]

[Embodiment of the invention]

 FIG. 1 is an exploded perspective view of the mounting structure according to the present invention, FIG. 2 is a front view of the bearing A, FIG. 3 is a view taken in the direction of the arrow III in FIG. 2, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 5 is an explanatory view of the mounting structure viewed from the inner side of the mounting plate B. The rotary shaft 1 shown in FIG. 1 is a feed roller shaft of the printer.

The bearing A is a resin integrally molded product molded using a two-piece mold. As shown in FIGS. 1 to 4, the bearing A includes a cylindrical tubular portion 9, a large-diameter circular flange portion 10 provided at one end of the cylindrical portion 9, and a radially opposite side of the flange portion 10. And a pair of projecting pieces 11, 11, which are extended from two places and are distributed on both sides of the cylindrical portion 9, and inward engaging claws provided separately at the distal ends of the projecting pieces 11, 11. The plate 13 has a plate 13 protruding outward from the flange 10 in the radial direction of the flange 10, and a projection 14 provided at a tip end of the plate 13. The rotary shaft 1 can be rotatably fitted to the cylindrical portion 9.

On the other hand, the mounting plate B has a circular mounting hole 21, an engaging hole 22 located near the mounting hole 21 at a distance from the mounting hole 21, And a small hole forming a recess 25 for use, and a pair of engaging holes 22 are provided separately on both sides of the mounting hole 21. Each of the engagement holes 22, 22 is formed in an arc shape concentric with the mounting hole 21. Also, wide portions 23, 23 are provided in the respective engaging holes 22, 22. The shapes of the engagement holes 22 having the wide portions 22 are symmetrical to each other via the center of the attachment hole 21.

As shown in FIG. 5, the cylindrical portion 9 of the bearing A is fitted in the mounting hole portion 21 of the mounting plate B, and the entire peripheral portion of the cylindrical portion 9 is fitted to the hole edge of the mounting hole portion 21. In contact. Therefore, the contact point between the outer peripheral surface of the cylindrical portion 9 and the hole edge of the mounting hole portion 21 forms a circle, and the circular contact portion is indicated by reference numeral a in FIG. When the entire peripheral portion of the cylindrical portion 9 fitted into the mounting hole portion 21 is in contact with the hole edge of the mounting hole portion 21, the cylindrical portion 9 is positioned at the entire peripheral portion by the hole edge. As a result, after the mounting of the bearing A, the rattling of the cylindrical portion 9 in the radial direction does not occur between the bearing A and the mounting plate B, so that the bearing A has a high positional accuracy and good mounting stability. Is secured. Therefore, it is unlikely that the bearing A will wobble during rotation of the rotary shaft 1 and adversely affect the printing accuracy of the printer. The rotating shaft 1 is rotatably fitted to the cylindrical portion 9.

Further, a pair of projecting pieces 11, 11 extending from the flange 10 of the bearing A are inserted into the respective engaging holes 22, 22, and the projecting pieces 11, 11 The mounting plate B is held on both sides of the mounting hole 21 by the engaging claws 12 and 12 provided on each of the mounting holes 21 and the flange portion 10. Therefore, the cylindrical portion 9 does not fall out of the mounting hole portion 21.

Further, the plate 13 of the bearing A extends along the plate surface of the mounting plate B, and the projection 14 provided on the plate 13 is provided with a positioning recess 25 on the mounting plate B side. It is stuck in. Therefore, the bearing A is positioned in the circumferential direction of the cylindrical portion 9 by the engagement between the concave portion 25 and the projection 14.

When the bearing A is mounted on the mounting plate B, the engagement claw 12 of the bearing A is aligned with the wide portion 23 provided in the engagement hole 22 as shown by the imaginary line in FIG. In this state, the cylindrical portion 9 is fitted into the mounting hole portion 21, and then the bearing A is rotated by a predetermined angle as indicated by an arrow a in FIG. By doing so, the engagement claw 12 moves from the wide portion 23 toward the engagement hole 22, and the mounting plate B is sandwiched between the flange 10 and the engagement claw 12, whereby the bearing A is formed. The projections 14 provided on the plate pieces 13 are fitted into the positioning recesses 25 of the mounting plate B, so that the bearing A is rotated in the rotation direction of the rotary shaft 1 (the circumference of the cylindrical portion 9). (Corresponds to the direction).

Although the bearing A of the embodiment described above is used to support a feed roller shaft of a printer, the bearing A can also be used to support other types of rotating shafts. It is. In the above-described embodiment, a pair of engaging holes 22 are provided on both sides of the mounting plate B on both sides of the mounting hole 21, and each of the engaging holes 22 is provided in each of the engaging holes 22. A pair of protruding pieces 11, 11 extending from the flange 10 are inserted separately, and the mounting plate is formed by engaging claws 12, 12 provided on each of the protruding pieces 11, 11 and the flange 10. B is sandwiched, but this point is that only one engagement hole 22 and one protruding piece 11 are provided, and the engagement of the attachment plate B by the engagement claw 12 and the flange 10 May be performed only on one side.

[0023]

[Effect of the invention]

 As described above, according to the present invention, the positional accuracy and mounting stability of the bearing are improved. Therefore, when the rotating shaft is the feed roller shaft of the printer, the printing accuracy can be improved through the improvement of the bearing positioning accuracy and mounting stability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a mounting structure according to the present invention.

FIG. 2 is a front view of the bearing.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is an explanatory view of a mounting structure viewed from the inner surface side of the mounting plate.

FIG. 6 is an exploded perspective view of a conventional mounting structure.

FIG. 7 is an explanatory view of a conventional mounting structure viewed from the inner side of a mounting plate.

FIG. 8 is an explanatory diagram for explaining a problem of a conventional mounting structure.

[Explanation of symbols]

 Reference Signs List A bearing B mounting plate 1 rotating shaft 9 cylindrical portion 10 flange portion 11 projecting piece 12 engaging claw 13 plate piece 14 projection 21 mounting hole 22 engaging hole 23 wide portion 25 concave portion

Claims (6)

[Utility model registration claims] A rotary shaft is provided in the mounting hole of a mounting plate having a circular mounting hole and an engaging hole located at a location near the mounting hole and spaced from the mounting hole. The cylindrical portion of the bearing rotatably inserted therein is fitted, the entire peripheral portion of the cylindrical portion is in contact with the hole edge of the mounting hole, and the flange provided on the cylindrical portion and the flange are provided. A mounting structure for a resin bearing, wherein the mounting plate is sandwiched by an engaging claw provided at a tip end of a protruding piece extending from the engaging hole and inserted into the engaging hole. 2. A pair of said engaging holes are separately provided on both sides of said mounting plate sandwiching said mounting hole portion, and both sides of said pair of engaging hole portions sandwiching said cylindrical portion. And a pair of the projecting pieces extending from the flange are separately inserted into the projecting pieces, and the mounting plate is formed by the engaging claws and the flanges provided on each of the projecting pieces. 2. The mounting structure for a resin bearing according to claim 1, wherein the mounting structure is sandwiched on both sides of the bearing. 3. The engagement hole portion is formed in an arc shape concentric with the mounting hole portion, and the engagement hole portion has a wide portion through which the engagement claw is inserted and withdrawn. Item 2. A mounting structure for a resin bearing according to Item 1. 4. A pair of said engaging holes are formed in an arc shape concentric with said mounting hole, and said engaging holes are provided with a wide portion through which said engaging claws are inserted and withdrawn. The mounting structure for a resin bearing according to claim 2. 5. The resin bearing is provided with a plate protruding along a plate surface of the mounting plate, and a projection provided on the plate is provided with a positioning recess formed on the mounting plate. The mounting structure for a resin bearing according to any one of claims 1 to 4, wherein the mounting structure is fitted. 6. The mounting structure for a resin bearing according to claim 1, wherein said rotating shaft is a feed roller shaft of a printer.