JP4405035B2 - Roller support structure - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a structure that supports a roller, and more particularly, to a support structure that absorbs runout of the roller.
[0002]
[Prior art]
The roller used to transport paper used in copiers, printers, etc. is composed of a metal rotating shaft and a roller body made of resin or rubber. The wobbling of the central part of the roller body when the shaft is supported and rotated is regarded as important.
[0003]
For example, when a roller with poor straightness is used to support and fix the roller at both ends, it is not possible to uniformly press the paper, photographic paper, or the like, which is a conveyed product, on the outer peripheral surface of the roller body. That is, when the entire roller is slightly bent in an arcuate shape, for example, in the central portion of the roller body, there are times when the roller makes one turn and when it comes in contact with the conveyed object and when it is separated from the conveyed object. Variations in the pressure contact force occur. As a result, it becomes difficult to accurately convey paper or the like without meandering straightly, greatly affecting the printing capability of the copying machine and printer.
[0004]
Therefore, the straightness to the developing roller, the pressure roller, the fixing roller, etc. is required to be 0.05 mm or less. However, when manufacturing a roller having a runout of 0.05 mm or less, the roller body of the roller supported at both ends. It is indispensable to polish the outer peripheral surface cylindrically, and it is technically difficult to finish to an accuracy of 0.05 mm or less, and it takes time to polish each roller. For example, runout is up to 0.15 mm. Compared to an acceptable roller, the cost could be nearly double.
[0005]
Conventionally, as shown in FIG. 4, for example, when paper is conveyed by a pair of rollers 1 and 1 on a roller 1 having high accuracy and straightness, one roller 1 (lower side) is fixedly provided. At the same time, the other roller 1 (upper side) is freely movable by inserting the rotary shaft 12 through the long shaft insertion hole 31 so that the other roller 1 (upper side) is vertically contacted and separated from the one roller 1 (lower side). In addition, a mechanism capable of absorbing the shake of the roller 1 is used such that the paper as the conveyed product is pressed and conveyed by the urging force of the spring 4 on the outer peripheral surface of the pair of roller bodies 11, 11. It was general.
[0006]
In addition, is it possible to separately provide a vibration absorbing mechanism in the bearing portion of the roller 1 such as attaching a spring to the bearing into which the rotating shaft 12 is inserted to maintain the applied pressure, or softening the roller main body 11 itself to absorb vibration? The material of the roller body 11 was changed to absorb the shake.
[0007]
[Problems to be solved by the invention]
However, even if it is provided so as to be movable toward and away from one of the rollers, the rotation shaft 12 can escape in the vertical direction in the case of FIG. Even in the case of a roller that is bent in a straight line, the central part of the roller body can always abut against the central part of the roller body of the counterpart roller, and it is possible to cope with it, but vibrations other than the vertical direction cannot be absorbed. That is, the long shaft insertion hole 31 provided in the side plate 3 of FIG. 4 has almost no margin in the left-right direction on the paper surface (because it is a rigid), and therefore the arcuate shape of the roller 1 (upper) bent in an arcuate shape. When the central portion of the roller body 11 that is convex is positioned on the left or right side on the paper surface, the rotation shaft 12 is in contact with the shaft insertion hole 31, so that the deflection becomes maximum at the central portion of the roller body 11, and the upper side The central part of the roller body and the central part of the lower roller body cannot be brought into full contact.
[0008]
Further, as shown in FIG. 4, when a vibration absorbing mechanism is separately provided in the bearing portion of the roller 1, a space for the bearing portion is required and the mechanism becomes complicated. Therefore, since the number of parts also increases, it takes assembling man-hours and is disadvantageous in terms of cost.
[0009]
In addition to considering the adhesiveness and transportability of paper to the material of the roller main body 11, considering the vibration absorption, the materials that can be used are limited, so the material cost is also increased.
[0010]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a roller support structure that can absorb vibration without requiring a useless space for the vibration absorbing mechanism.
[0011]
[Means for solving the problems]
That is, in order to solve the above-mentioned problems, the present invention has a fixed roller and a pressure contact roller, each roller is composed of a rotating shaft and a roller body, and each roller is inserted into an insertion hole of the side plate. in the roller supporting structure of the rotary shaft is inserted and is supported at both ends, through holes roller Yu and with spring ring formed by fitted spring member inside the ring member of a substantially U-shape the pressure-side roller It is attached to a main body, The outer peripheral surface of the said spring-loaded ring contact | abuts to the rotating shaft of the said fixed side roller, It is characterized by the above-mentioned.
[0012]
Alternatively, the outer peripheral surface of the spring-loaded ring is in contact with the bottom surface of a groove provided in the roller body of the fixed roller .
[0013]
The ring member of the spring-loaded ring is made of resin, and the spring member is a coil spring.
[0014]
[Action]
According to the roller support structure of the present invention, the both end support structure is not fixed, and both ends are supported by spring-loaded rings. It can be absorbed by the elasticity of the entrance ring, and the pressure contact force to the conveyed product at the center of the roller body is almost constant. Therefore, in the roller support structure of the present invention, since the roller can be allowed to slightly shake, the roller can be used even if the roller does not have a shake of 0.05 mm or less, and the manufacturing cost of a copying machine, a printer, or the like can be reduced.
[0015]
In addition, since it is held by a spring-loaded ring that also has slidability, the spring-loaded ring can be attached to the ring insertion hole of the side plate, and it is not necessary to provide a separate space for the vibration absorbing mechanism. Since the bearing member has a vibration absorbing function as it is, the number of parts and the number of assembly steps can be reduced, which is advantageous in terms of cost.
[0016]
Furthermore, the urging force of the roller can be easily achieved by adjusting the spring multiplier in the spring-loaded ring, or adjusting the number of turns of the spring and the winding angle.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a roller support structure of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a view showing a half-split state of a spring-loaded ring.
[0018]
The roller 1 shown in FIGS. 1 and 2 is obtained by coating a metal rotating shaft 12 with a roller body 11 made of resin and rubber. The roller body 11 has an inner layer made of resin and an outer layer made of rubber, and is formed into a hollow cylindrical pipe shape by extrusion molding, and then a metal rotating shaft 12 is inserted.
[0019]
The side plate 3 in FIGS. 1 and 2 is for supporting the roller 1 at both ends, and the side plate 3 is inserted into a shaft insertion hole 31 through which the rotation shaft of the roller 1 is inserted or a ring through which a spring-loaded ring 2 is attached. A hole 32 is provided.
[0020]
As shown in FIG. 3, the spring-loaded ring 2 is provided with a metal spring member 23 inside a resin ring member 22 having a substantially U-shaped cross section. Since the ring member 22 rotates with the rotary shaft 12 inserted through the insertion hole 21, a material having excellent friction characteristics and low sliding property such as PTFE is suitable.
[0021]
For the spring member 23 of the spring-loaded ring 2, a plate-like metal member shown in FIG. 3A is bent in a U shape and attached to the ring member 22, or as shown in FIG. 3B. As described above, there is one in which a ring spring 22 is provided with a coil spring. In both cases, when a force is applied in the radial direction from the insertion hole 21 side or the outer diameter side direction of the spring-loaded ring 2, the spring member 23 inside the ring member 22 has a restoring force due to its elasticity. The shape of the ring member 22 is maintained as compared with the case without the 23. Therefore, there is no possibility that the ring member 22 will cause a creep phenomenon and the original shape cannot be maintained as in the case where only the PTFE ring member 22 is used by inserting the rotating shaft 12 therethrough.
[0022]
Further, since the elastic characteristics of the spring member 23 change depending on the adjustment of the spring multiplier and the number of turns of the coil spring, the spring member 23 can be easily adjusted with a force for holding the shape of the ring member 22.
[0023]
Next, as shown in FIGS. 1 and 2, when two rollers 1 are installed as a set in a copying machine, a printer, or the like, the shaft 1 is inserted into the shaft insertion hole 31 of the side plate 3 that supports one roller 1 at both ends. The rotating shaft 12 is inserted into the fixed side roller 1 (lower side), and the spring-loaded ring 2 is attached to the ring insertion hole 32 of the side plate 3, and the other roller 1 is inserted into the insertion hole 21 of the spring-loaded ring 2. The rotary shaft 12 is inserted into the pressure contact side roller 1 (upper side).
[0024]
Here, the positions of the shaft insertion hole 31 and the ring insertion hole 32 of the side plate 3 are provided so that the outer peripheral surface of the roller main body 11 of the fixed roller 1 and the outer peripheral surface of the roller main body 11 of the pressure contact roller 1 slightly wrap. Thus, the pressing roller 1 is pressed against the fixed roller 1 by the elastic force of the spring-loaded ring 2 through which the rotary shaft 12 of the pressing roller 1 is inserted.
[0025]
Therefore, since the elastic force of the spring-loaded ring 2 is pressed against the surface of the opposite roller body, a conveyed object such as paper can obtain a uniform pressing force from the roller, and the roller does not have high accuracy straightness. The vibration of 1 can be absorbed.
[0026]
That is, when the slightly curved roller 1 having poor straightness is rotated, the surface of the roller body 11 is always in close contact with the conveyed object at the substantially center of the roller body 11, that is, the portion through which the conveyed object passes. To do. However, when the center portion of the curved roller 1 is always brought into close contact with the counterpart roller 1 (or the conveyed product), wrinkles of distortion concentrate on both ends of the roller 1.
[0027]
However, in the present invention, both ends of the roller 1 are supported by the spring-loaded ring 2 and the distortion is absorbed by the elasticity thereof, so that the central portion of the roller body 11 is always stably supported by the counter roller 1 (or the conveying roller). Product). In other words, conventionally, both ends of the roller 1 are fixed and the roller 1 is rotated with reference to the both ends. However, in the present invention, the elastic force is applied to both ends of the roller by being supported by the spring-loaded ring 2. The roller 1 is rotated with the central portion of the roller body 11 as a reference.
[0028]
Although FIG. 2A shows an embodiment in which the spring-loaded ring 2 is inserted into the rotating shaft 12, it is more effective to support the central portion of the roller main body 11 near the central portion of the roller main body 11. . Therefore, as shown in FIG. 2B, the outer peripheral surface of the roller body 11 of the pressure contact side roller 1 with the spring-loaded ring 2 attached to the roller body 11 and the outer peripheral surface of the roller body 11 of the stationary roller 1 attached to the spring-loaded ring 2 is attached. It is good also as a structure press-contacted to a surface. At this time, the outer peripheral surface of the spring-loaded ring 2 is in contact with the rotating shaft 12 of the fixed-side roller 1 or a groove that can accommodate the spring-loaded ring 2 is provided in the roller body 11 of the fixed-side roller 1. It is good also as a structure contact | abutted to the bottom face.
[0029]
In the above embodiment, there is always a fixed roller. However, even when a conveyed object is transferred by a single roller, it is only necessary that the roller be a support structure according to the present invention and the other side be the fixed side. Needless to say.
[0030]
【The invention's effect】
According to the rotary shaft seal of the present invention as described above, since the vibration is absorbed while supporting the roller, it can be used even if the vibration is not a roller of 0.05 mm or less, and the manufacturing cost of a copying machine, a printer, etc. Can be reduced.
[0031]
Further, since the spring-loaded ring that supports the roller can be accommodated in the ring insertion hole of the side plate, there is no need to provide a space for the vibration absorbing mechanism.
[0032]
Further, regarding the number of parts, it is not necessary to provide a separate vibration absorbing mechanism as in the prior art, and the number of parts can be reduced and the number of assembly steps can be reduced, which is advantageous in terms of cost.
[0033]
Furthermore, since the urging force of the roller can be adjusted by adjusting the spring multiplier in the spring-loaded ring or adjusting the number of turns of the spring and the winding angle, it is not necessary to provide a separate adjustment function.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a roller support structure of the present invention.
FIG. 2 is a side view showing a roller support structure of the present invention.
FIG. 3 is a view showing a spring-loaded ring.
FIG. 4 is a view showing a conventional roller support structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roller 2 Spring containing ring 3 Side plate 4 Spring member 11 Roller main body 12 Rotating shaft 21 Insertion hole 22 Ring member 23 Spring member 31 Shaft insertion hole 32 Ring insertion hole

Claims (3)

A roller support having a fixed side roller and a pressure contact side roller, each roller comprising a rotation shaft and a roller body, and each roller being supported at both ends by inserting each rotation shaft through an insertion hole of a side plate in construction, with spring rings have a through hole formed by fitted spring member inside the ring member of a substantially U-shape is attached to the roller body of the pressure-side roller, the outer peripheral surface of the spring containing ring wherein A roller support structure, wherein the roller support structure is in contact with a rotating shaft of a fixed roller . A roller support having a fixed side roller and a pressure contact side roller, each roller comprising a rotation shaft and a roller body, and each roller being supported at both ends by inserting each rotation shaft through an insertion hole of a side plate In the structure, a spring-loaded ring having an insertion hole and having a spring member fitted inside a ring member having a substantially U-shaped cross section is attached to the roller body of the pressure contact side roller, and the outer peripheral surface of the spring-loaded ring is A roller support structure that abuts against a bottom surface of a groove provided in a roller body of a fixed roller . The roller support structure according to claim 1 or 2, wherein the ring member of the spring-loaded ring is made of resin, and the spring member is a coil spring.

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