JP2821314B2 - Shaft mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft mounting device for mounting a shaft such as a roller of a printer to a support such as a frame.

[0002]

2. Description of the Related Art Conventionally, a shaft mounting device of this type has been disclosed, for example, in Japanese Utility Model Laid-Open No. 56-84125. FIG.
FIG. 1 is a configuration diagram illustrating an example of a roller attachment portion of a conventional printer. In the drawing, reference numerals 1 and 2 denote support portions, such as a frame and an arm, which face each other, and each of them has a through hole
a, 2a are provided. 3 is a through hole 1 at both shaft ends.
a, a roller as a shaft passing through 2a.

[0003] Reference numerals 4 and 5 are fitted into the through holes 1a and 2a, respectively, and a bearing (bearing) rotatably supporting the shaft of the roller 3, and 6 is reciprocally mounted on one shaft end of the roller 3. It is a cylindrical collar and this color 6
Is a convex portion 6a which engages with the concave portion 3a provided at the shaft end.
have. Reference numeral 7 denotes a backlash spring provided between the bearing 5 and the collar 6, and reference numeral 8 denotes a washer provided between the bearing 5 and the spring 7.

FIG. 13 is an enlarged perspective view showing the collar 6 of FIG. 12, and FIG. 14 is a sectional view of FIG. In the figure,
Notches 6b are provided on both sides of the protrusion 6a,
The protrusion 6a can be elastically deformed in the direction of the arrow in FIG. 14 using the knob 6c.

Next, the operation will be described. When the roller 3 is attached to the support portions 1 and 2, as shown in FIG.
An assembly in which the collar 6, the spring 7, the washer 8, and the bearing 5 are displaced is assembled, and one shaft end is inserted into the through hole 1 a together with the bearing 4, and the other shaft end is inserted into the through hole 2 a. . Thereafter, the collar 6, the spring 7, the washer 8 and the bearing 5 are moved in the direction of the arrow in FIG. 15, so that the projection 6a is dropped into the recess 3a and the bearing 5 is inserted into the through hole 2a.
Insert

The rollers 3 attached to the supports 1 and 2 do not come off from the supports 1 and 2 unless the bearings 4 and 5 come off from the through holes 1a and 2a. Also,
The bearings 4 and 5 do not come off the through holes 1a and 2a unless the protrusion 6a comes off the recess 3a and the collar 6 moves to the left in FIG. Conversely, when removing the roller 3 from the support portions 1 and 2, the knob 6c or the like is used to project the protrusion 6a.
Is lifted from the recess 3a, and the collar 6 and the like are shifted as shown in FIG.

FIG. 16 is a structural view showing another example of a roller mounting portion of a conventional printer, in which end surfaces of bearings 4 and 5 are respectively restrained by E-rings (or C-rings) 9. . These E-rings 9 are attached to the shaft of the roller 3 by a special tool (not shown).

[0008]

Among the conventional roller mounting portions configured as described above, the roller mounting portion shown in FIGS. 12 to 15 can be mounted easily by hand, but the roller 3 is not required. Since the entire load applied in the axial direction must be received as a moment load by the elastically deformable portion of the collar 6, the convex portion 6a comes off from the concave portion 3a due to strong vibration or impact in the axial direction, and the roller 3 There was a problem that it was easy to fall off. Further, in the case shown in FIG. 16, since the E-ring 9 needs to be attached by a special tool, it takes time and effort to attach the E-ring 9 and cannot be installed in a place where the tool cannot enter. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made in consideration of the problems described above.
An object of the present invention is to provide a shaft mounting device that can easily perform a removing operation by hand without using a special tool, and that can increase the strength against vibration and impact to prevent the shaft from falling off.

[0010]

According to a first aspect of the present invention, there is provided a shaft body mounting device including first and second collars whose total length when connected can be switched in at least two stages, and which are elastically opposed to each other. A shaft is rotatably mounted between possible support portions.

According to a second aspect of the present invention, there is provided a shaft mounting device, wherein a total length of the shaft mounting device can be switched to at least two stages.
And a second collar, and an elastic material for urging at least one of the first and second collars in a direction in which the first and second collars are coupled to each other.

[0012]

According to the first aspect of the present invention, the first and second collars are inserted by inserting the shaft body and the first and second collars between the support portions in a state where the overall length is short, and elastically deforming the support portions. Are separated from each other, and the concave portion with which the convex portion is engaged is switched,
The total length of the first and second collars is increased.

According to the second aspect of the present invention, the shaft and the first and second collars are inserted between the support portions in a state where the overall length is short, and the first and second collars are separated from each other against the elastic material. The length of the first and second collars is increased by switching the recesses with which the projections engage.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 is an exploded perspective view showing a main part of a shaft mounting device for a roller of a printer according to an embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes a cylindrical first collar through which the shaft end of the roller 3 passes.
Is provided with two convex portions 11a provided at equal intervals in the circumferential direction and extending in the axial direction. Reference numeral 12 denotes a cylindrical second collar which is connected to the axial end of the first collar 11 and through which the axial end of the roller 3 passes.
It has two first concave portions 12a with which the convex portions 11a engage, and two second concave portions 12b which are shallower than the first concave portions 12a and with which the convex portions 11a engage. Thus, the total length of the first and second collars 11 and 12 when they are connected to each other can be switched in two stages.

The supporting portions 1 and 2 of the first embodiment are elastically deformable. Further, the shaft body mounting device of the first embodiment includes first and second collars 11 and 12 and bearings 4 and 4.
5 (FIGS. 2 to 4).

Next, the operation will be described. First, FIG.
As shown in FIG. 5, the first and second collars 11, 12 are connected to each other by engaging the convex portion 11a with the first concave portion 12a, and the total length of the first and second collars 11, 12 is set to L1. In this state, the bearing 4 is inserted into the through hole 1a of the support portion 1 and one end of the roller 3 is passed through the bearing 4, the first and second collars 11, 12. A bearing 5 is attached to the other shaft end of the roller 3.

Thereafter, the roller 3 and the first collar 11 are moved rightward in the drawing, and the bearing 5 is inserted into the through hole 2a.
When the first and second collars 11 and 12 are further separated from each other from this state, for example, as shown in FIG. 3, at least one of the support portions 1 and 2 is elastically deformed. When the convex portion 11a has completely come out of the first concave portion 12a, the first collar 11 is rotated by 90 ° in the circumferential direction, and the convex portion 11a is rotated.
a is engaged with the second recess 12b. As a result, the total length of the first and second collars 11, 12 becomes L, as shown in FIG.
The length L2 becomes longer than the length L1, and the work of mounting the roller 3 between the support portions 1 and 2 is completed. When the roller 3 is to be removed from the space between the support portions 1 and 2, the procedure may be reversed.

In such a shaft mounting device, the support portions 1 and
2 can be elastically deformed to separate the first and second collars 11 and 12 from each other and only rotate one of the first and second collars 11 and 12 by 90 °. The operation of mounting and removing the roller 3 can be easily performed by hand. Also,
Since a special tool is not required, even when obstacles 13a and 13b such as a frame as shown in FIG.

Further, cylindrical first and second collars 1 are provided.
Nos. 1 and 12 receive the vibration or shock as a compressive load, and the support portions 1 and 2 are not greatly elastically deformed by the vibration or shock. Therefore, the strength against vibration and shock is increased, and the roller 3 is prevented from falling off. You.

Embodiment 2 FIG. FIG. 5 is a structural view showing a roller mounting portion of a printer according to an embodiment of the present invention.
In the figure, reference numeral 14 denotes a spring as an elastic material provided between the bearing 4 at one shaft end of the roller 3 and the second collar 12. Color of
It is urged to 11 side. Further, the support portions 1 and 2 of the second embodiment
2 is made of a rigid body that is not easily elastically deformed.

As described above, when the support portions 1 and 2 are made of a rigid body, in the configuration of the first embodiment, the first and second collars 1 are used.
1 and 12 cannot be moved in the axial direction. Therefore, it is necessary to separately provide the spring 14 as in the second embodiment.

In the apparatus using such a spring 14, the spring
By pulling the second collar 12 away from the first collar 11 against the first collar 11 and rotating it by 90 °, the convex portion 11a can be engaged with each of the first and second concave portions 12a and 12b. 3 can be easily attached and removed by hand without using special tools. In addition, by providing the spring 14 with an appropriate elastic force, the strength against vibration and impact is increased, and the roller 3 is prevented from falling off.

Embodiment 3 FIG. FIG. 6 is a perspective view showing a pair of collars according to another embodiment of the present invention. In the figure, a color that also serves as the first and second colors
21 is equally divided by 2 m in the circumferential direction (m = 2, 3, ...
.), And the convex portions 21a and the first concave portions 21b are provided alternately. Further, the protrusion 21a is equally divided into n in the circumferential direction (n =
3, 4,...) To provide a second concave portion 21c. The figure shows a case where m = 2 and n = 3 as an example.

FIG. 7 is a developed view showing a connected state of the pair of collars 21 of FIG. As shown in the figure, the protrusion of one collar 21
A state in which the whole of 21a is engaged with the first concave portion 21b of the other collar 21, and a state in which the tip of the convex portion 21a of one collar 21a is engaged with the second concave portion 21c of the other collar 21. , That is, the difference in the engagement, the total length of the pair of collars 21 that are connected is variable by the dimension A. Since two identical collars 21 are used, it is necessary to consider fitting tolerances.

FIG. 8 is a perspective view showing a state in which the roller 3 is being mounted between the supporting portions 1 and 2 which are not elastically deformed by using the collar 21 of FIG. 6, FIG. 9 is a developed view of the collar 21 of FIG.
8 is a perspective view showing the state after the mounting in FIG. 8, and FIG. 11 is a developed view of the collar 21 in FIG.

When the roller 3 is mounted using the above-mentioned collar 21, the collars 21 are separated from each other against the spring 14 from the state where the total length of the pair of collars 21 is short as shown in FIGS. It is sufficient that the pair of collars 21 is rotated so that the total length of the pair of collars 21 is long as shown in FIGS.

According to the third embodiment, the work of mounting and removing the roller 3 can be easily performed by hand without using a special tool. As in the first and second embodiments, the load in the compression direction is applied to the pair of collars 21 only when the load applied to the roller 3 acts in the axial direction, and the loads in the other directions can be ignored. Accordingly, by providing the spring 14 with an appropriate elastic force, the strength against vibration and impact is increased, and the roller 3 is prevented from falling off. Further, since the same color 21 is used as the first and second colors, the manufacturing cost can be reduced and the whole can be inexpensive.

It goes without saying that the collar 21 of the third embodiment can also be applied to the elastically deformable supports 1 and 2.
In each of the above embodiments, the roller 3 of the printer is used as the shaft.
However, the present invention can be applied to other shafts used in printers and shafts of devices other than printers.

[0030]

As described above, the shaft mounting device according to the first aspect of the present invention is provided with the first and second collars whose total length when connected can be switched in at least two stages, and the supporting portion is elastic. Since the entire length of the first and second collars is switched by deforming, the work of attaching and detaching the shaft can be easily performed by hand without using a special tool, and the assembly cost can be reduced. By increasing the strength against vibration and shock,
This has the effect of preventing the shaft from falling off.

Further, the first and second collars of which the total length can be switched in at least two steps when combined, and the first and second collars are arranged in a direction in which the first and second collars are combined with each other. An elastic member for urging at least one of the second collar and the elastic member is elastically deformed to switch the total length of the first and second collars. Even in the case where it is not deformed, the same effect as the first aspect of the present invention can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a shaft mounting device for a roller of a printer according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a state in which a roller is being attached to a support portion of the printer using the first and second collars of FIG. 1;

FIG. 3 is a configuration diagram showing a state in a later stage of FIG. 2;

FIG. 4 is a configuration diagram showing a state after attachment in FIG. 2;

FIG. 5 is a structural view showing a roller mounting portion of the printer according to one embodiment of the second invention.

FIG. 6 is a perspective view showing a pair of collars according to another embodiment of the present invention.

FIG. 7 is a developed view showing a state in which the pair of collars shown in FIG. 6 are combined.

FIG. 8 is a perspective view showing a state in which a roller is being mounted between supporting portions that are not elastically deformed by using the collar of FIG. 6;

FIG. 9 is a developed view of the collar of FIG. 8;

FIG. 10 is a perspective view showing a state after the mounting of FIG. 8;

FIG. 11 is a developed view of the collar of FIG. 10;

FIG. 12 is a configuration diagram illustrating an example of a roller attachment portion of a conventional printer.

FIG. 13 is an enlarged perspective view showing the collar of FIG. 12;

FIG. 14 is a sectional view of FIG.

15 is a configuration diagram showing a state in the middle of attachment / detachment of FIG. 12;

FIG. 16 is a configuration diagram illustrating another example of a roller attachment portion of a conventional printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support part 2 Support part 3 Shaft body 11 1st collar 11a Convex part 12 2nd collar 12a 1st recessed part 12b 2nd recessed part 14 Spring (elastic material) 21 collar (1st and 2nd collar) 21a Convex part 21b First concave part 21c Second concave part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16C 13/02 B41J 13/076

Claims (2)

(57) [Claims] 1. A shaft body mounting device provided at a shaft end of a shaft body and rotatably mounting the shaft body between elastically deformable support portions facing each other, wherein the shaft body mounting device is spaced apart from each other in a circumferential direction. A first collar having a plurality of projections extending in the axial direction, and first and second collars provided at intervals in the circumferential direction and having different depths, and each of which is engaged with the projections. And a second collar coupled to an axial end of the first collar, the total length of the first and second collars when coupled to each other is at least 2
A shaft mounting device characterized in that it can be switched between stages. 2. A shaft body mounting device provided at a shaft end of a shaft body for rotatably mounting said shaft body between support portions facing each other, wherein said shaft body mounting device is axially spaced apart from each other in a circumferential direction. A first collar having an extending convex portion, and first and second concave portions provided at intervals in the circumferential direction and having different depths from each other, and each of which engages with the convex portion; A second collar coupled to the axial end of the first collar; and biasing at least one of the first and second collars in a direction in which the first and second collars are coupled to each other. A shaft body mounting device, comprising: an elastic member for connecting the first and second collars to each other so that the total length of the first and second collars can be switched in at least two stages.