JP3346544B2 - Endless belt for paper feed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper feeder such as a copying machine, an electrophotographic apparatus,
AX), which relates to an endless belt for feeding and conveying used in a feeding section and the like.

[0002]

2. Description of the Related Art Conventionally, a paper feeding roll or a paper feeding endless belt has been used in an automatic paper feeding section of a copying machine, an electrophotographic apparatus, a printer, or the like, or a paper feeding section of a facsimile (FAX). As this type of belt, a rubber belt having a core made of a woven fabric of nylon or polyester, or a rubber belt having a nylon knitted material having a thin rubber layer coated on a conveying surface and having a polyester or cotton thread wound thereon as a core is generally used. Is used regularly.

[0003]

However, since the above-mentioned conventional belt is a flat belt, especially when speeding up is attempted, slippage between pulleys causes uneven conveyance and rotation delay. There's a problem.

Accordingly, the present invention has been made in view of such circumstances,
An object of the present invention is to provide an endless belt for feeding and transporting which does not cause uneven transport and rotation delay.

[0005]

According to a first aspect of the present invention for solving the above-mentioned problems, the rubber hardness is 20 to 50 in JIS A.
An endless belt made of a rubber-like elastic body having a plurality of teeth meshing with a toothed pulley on a pulley contact surface, wherein the thread-like core body is provided inside the rubber-like elastic body. close to the contact surface it from stretch fabric
And stretch in the width direction compared to stretch in the belt length direction
An endless belt for feeding and conveying paper , wherein a core body having a size of 1/5 or less is provided.

[0006] A second aspect of the present invention is directed to the first aspect.
The stretchable woven fabric is one in which a warp yarn of a high-strength yarn having a high twist number arranged in the belt width direction and a weft yarn of a false twist yarn arranged in the belt length direction are twill-woven. An endless belt for feeding and conveying paper.

A third aspect of the present invention is directed to the second aspect.
The stretchable woven fabric is a high-strength yarn in which a warp arranged in a belt width direction uses a filament yarn of 50d to 150d made of at least a nylon yarn or a polyester yarn and has a twist number of 200 to 800. An endless belt for feeding and conveying is characterized in that the weft arranged in the longitudinal direction is a false twisted yarn using a filament yarn of 100d to 200d.

[0008] A fourth aspect of the present invention is any one of the first to third aspects .
In the aspect of the present invention, there is provided an endless belt for feeding and transporting , wherein a friction coefficient of a surface is 1.3 or more.

A fifth aspect of the present invention is directed to the fourth aspect.
The rubbery elastic body is selected from EPDM (ethylene / propylene trimer), NBR (acrylonitrile-butadiene rubber), hydrogenated NBR and polyurethane, and has a rubber hardness of 20 to 50 ° in JIS A. The feature is the endless belt for feeding and conveying paper.

[0010] In a sixth aspect of the present invention, the rubber hardness is JIS.
Endless belt made of a rubber-like elastic body of 20 to 50 degrees in A
A thread-like core is provided inside the rubber-like elastic body.
The pulley contact surface engages with the toothed pulley.
Has a plurality of meshing teeth and is close to the pulley contact surface
A core body made of elastic woven fabric is provided,
The woven fabric is a high twist yarn with a high number of twists arranged in the belt width direction.
Warp yarns and false twist yarns arranged in the belt length direction.
Is a twill weave, and in the belt width direction
If the warp to be arranged is at least nylon yarn or polyester
Use 50d-150d filament yarn consisting of tellur yarn
It is a high-strength yarn with a twist number of 200 to 800,
The weft arranged in the belt length direction is 100d to 200d
Endless belt for feeding and transporting, characterized in that it is a false twist yarn using a filament yarn .

In a seventh aspect of the present invention, the rubber hardness is JIS.
Endless belt made of a rubber-like elastic body of 20 to 50 degrees in A
Wherein the rubber-like elastic body is made of EPDM (ethylene
Propylene trimer) and EPDM 100 weight
Vulcanized by adding at least 6 parts by weight of a vulcanization accelerator to
A thread-like core is provided inside the rubber-like elastic body.
As well as a toothed pulley on the pulley contact surface.
It has a plurality of meshing teeth, and is located close to the pulley contact surface.
And a core body made of stretchable woven fabric
Has a coefficient of friction of 1.3 or more .

An eighth aspect of the present invention is the endless belt for feeding and conveying according to the seventh aspect, wherein the vulcanization accelerator is a thiuram type.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the thread-like core is a thread selected from a nylon thread, a polyester thread, a cotton thread and an aromatic polyamide thread. The feature is the endless belt for feeding and conveying paper.

The endless belt for feeding and conveying the sheet according to the present invention comprises:
Has teeth that mesh with the toothed pulley on the pulley contact surface,
In addition, since a core body made of a stretchable woven fabric is provided near the contact surface of the pulley, no slippage occurs between the pulley and the pulley, so that the followability is good, and there are no problems such as uneven conveyance and rotation delay.

Here, the phrase "the core made of the stretchable woven fabric is" in the vicinity of the pulley contact surface "or" in the vicinity of the pulley contact surface "means that the stretchable woven fabric is exposed at the pulley contact surface. Or, a state where a part or the whole of the elastic woven fabric is covered with a thin rubber layer is shown.

In the present invention, as the first core body, a stretchable woven fabric having stretchability in the belt length direction but substantially not stretchable in the belt width direction is provided in the vicinity of the pulley contact surface, particularly, A nylon yarn or a polyester yarn is used as a warp arranged at least in the belt width direction, and a yarn having elasticity in the belt length direction but having substantially no elasticity in the belt width direction is used. That is, the elasticity in the width direction is 1/5 or less, preferably 1/1, of the elasticity in the belt length direction.
It is preferable to use a woven fabric in the range of 0 to 1/20.
Here, as the stretchable woven fabric, a warp yarn of a high-strength yarn having a high twist number arranged in the belt width direction and a weft yarn of a false twist yarn arranged in the belt length direction are twill-woven. Preferably, the warp yarn arranged in the belt width direction is at least 50d made of a nylon yarn or a polyester yarn.
~ 150d filament yarn and 2 twists
It is preferable to use a high-strength yarn of 00 to 800, and a weft arranged in the belt length direction is a false twist yarn using a filament yarn of 100 d to 200 d.

As described above, by using a woven fabric which has elasticity in the belt length direction but does not substantially have elasticity in the belt width direction, it becomes resistant to stress in an oblique direction, and jams, etc. In the case of the trouble described above, the problem such as the detachment of the belt hardly occurs. That is, if a woven fabric or a knitted fabric having elasticity in both the vertical and horizontal directions is used, the belt easily comes off due to a trouble such as a jam, and there is a problem that the belt cannot be practically used. On the other hand, if a normal woven fabric having almost no elasticity in both the vertical and horizontal directions is used, the woven fabric cannot be arranged close to the pulley contact surface of the toothed belt as in the present invention.

As the thread-like core as the second core, for example, a yarn selected from nylon yarn, polyester yarn, cotton yarn and aromatic polyamide yarn can be used.

In the present invention, the first core is made of a woven fabric having elasticity only in the belt length direction, and the second core is used to suppress unnecessary elongation in the belt length direction. A woven fabric can be provided along the pulley contact surface that meshes with the attached pulley, and a rubber belt can be obtained that suppresses elongation in the belt length direction and restricts elongation in the belt width direction to resist stress in an oblique direction.

Further, since such a woven cloth is provided on the pulley contact surface which meshes with the toothed pulley, even if dust or dust adheres, slipping with the toothed pulley is almost completely avoided,
Uneven conveyance and rotation delay are prevented.

In the present invention, the rubber composition constituting the endless belt body has a rubber hardness of 20 to 50 °, preferably 30 to 40 ° according to JIS A. This means that the belt surface has an appropriate coefficient of friction, preferably μ = 1.3 or more,
This is to ensure predetermined transportability.

As the rubber elastic body, EPDM, NBR,
Hydrogenated NBR, polyurethane and the like can be used.
However, in consideration of stability to the use environment such as temperature change and ozone resistance, it is particularly preferable to use EPDM,
In order to further improve the durability, it is preferable to use EPDM to which 6 parts by weight or more of a vulcanization accelerator is added.

However, since EPDM has insufficient abrasion resistance, EPDM containing at least 6 parts by weight of a vulcanization accelerator is used as described later in order to obtain high abrasion resistance with EPDM. Is preferred. When the toothed belt of the present invention is used as a paper feed belt, excessive friction may be generated due to forced rotation in the case of a paper jam or the like, and wear resistance is required more than usual.

As described above, in the present invention, in particular, the EPDM1
It is preferable that vulcanization accelerators, especially thiuram-based vulcanization accelerators, are added in an amount of 6 parts by weight or more, preferably 8 parts by weight or more, and vulcanized.

This is because when a vulcanization accelerator used in an amount of about 2 to 3 parts by weight is used in an amount of at least 6 parts by weight, preferably at least 8 parts by weight, which cannot be considered conventionally, the rubber hardness is almost maintained, and It is based on the finding that the wear resistance can be remarkably improved while maintaining the property, and is suitable for a feed belt composed of a toothed belt.

The vulcanization accelerator of the present invention is preferably a thiuram-based vulcanization accelerator, but may be a general vulcanization accelerator.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

(Embodiment 1) FIG. 1 is a schematic view of an endless belt for feeding and conveying paper according to an embodiment of the present invention. This endless belt 10 for feeding and conveying has teeth 11 at regular intervals on a pulley contact surface that contacts the pulley, and has a groove 12 between the teeth 11 that meshes with the teeth of the toothed pulley. In addition, near the surface of the pulley contact surface, a core 13 made of elastic woven fabric is provided.
Are provided along the surfaces of the teeth 11 and the grooves 12. Further, a thread-like core body 14 is provided near the root of the tooth 11 so as to extend in the longitudinal direction.

Here, the core 13 is a false twist yarn of a 100 d filament yarn having a twist number of 300 turns / m, a weft yarn of 150 d filament yarn and a weft density of 156. A stretchable woven fabric having a composition of book / inch and having elasticity only in the weft direction was used (elasticity in the horizontal direction: elasticity in the vertical direction = about 1: 1).
0). In addition, as the thread-like core body 14, polyester (PET) threads of # 30 (about 0.2 to 0.3 mm in thread thickness) were arranged at a pitch of 0.8 mm.

The endless belt 10 was manufactured as follows.

First, an elastic woven fabric is put on a grooved metal core having grooves corresponding to the teeth 11. At this time, the weft is arranged so as to be orthogonal to the axial direction of the cored bar. A thread-like core is spirally wound at a pitch of 0.8 mm on this, and the EPDM used in the belt body is dissolved with a solvent (for example,
A rubber paste diluted and dissolved about 15-fold in toluene or the like was applied as a co-paste. Further, an adhesive may be mixed.

Next, after drying, EPD was added to this.
M was extruded and covered with a rubber tube having a thickness of 2 to 2.5 mm.

Thereafter, a film was wound therefrom, put in a vulcanization can and steam-vulcanized to obtain a tube material for an endless belt. At this time, a lumirror film (polyester film: trade name) is used as the film, and the film is wound and vulcanized so as to apply a pressure of about 10 kg. This allows
The core body 13 and the rubber layer made of the elastic woven fabric are pressed into the grooves of the grooved metal core and molded, so that the teeth 11 and the grooves 12 are formed. At this time, an elastic woven fabric was arranged on the pulley contact surface provided with the teeth 11, and the surface was covered with a thin rubber layer.

The compounding of EPDM is as follows, and 5 parts by weight of the vulcanization accelerator is compounded.

The surface of this material was polished by a grinder and cut off at a predetermined width to obtain an endless belt having a rubber hardness of about 35 °. The belt width is about 25mm and the surface roughness of the polished surface is R
z = 30 ± 20.

The manufacturing method is not limited to this, and the rubber tube body may be formed by press molding or the like. Also,
The polishing step may be performed as needed, and a graining process, a pattern, or the like may be applied to the surface.

[0037]

[Table 1]

Example 2 The same procedure was followed as in Example 1 except that the vulcanization accelerator was used in an amount of 8 parts by weight in the EPDM. The rubber hardness was 40 °.

(Example 3) Hydrogenated NB instead of EPDM
Except using R, it manufactured similarly to Example 1. Rubber hardness was 40 °.

Example 4 The same procedure was followed as in Example 1 except that polyurethane was used instead of EPDM. Rubber hardness was 40 °.

Comparative Example 1 The procedure of Example 1 was repeated except that the EPDM was used as described above. The rubber hardness was 60 °.

Comparative Example 2 The procedure of Example 1 was repeated, except that the EPDM was used as described above. The rubber hardness was 15 °.

Comparative Example 3 Production was carried out in the same manner as in Example 1 except that butyl rubber (IIR) was used instead of EPDM. Rubber hardness was 40 °.

(Comparative Example 4) An endless belt of Comparative Example 1 was prepared in the same manner as in the above-mentioned Example, except that a knitted material obtained by knitting woolly nylon on a metal core having a smooth surface was inserted.

(Comparative Example 5) An endless belt of Comparative Example 2 was produced in the same manner as in the above-mentioned Example, except that the same knitted material as in Comparative Example 1 was wound around the grooved metal core as in Example. However, the rubber flowed into the molding surface of the belt, and the tooth profile of the knitted fabric could not be molded, and did not mesh well with the toothed pulley.

(Test Example 1) Examples 1 to 4 and Comparative Example 1
The endless belts prepared in Steps 2 and 4 were wound around a toothed pulley and a normal pulley to conduct a transport test.

As a result, in the belt of Comparative Example 4, conveyance unevenness and paper jam occurred, but in the endless belt of Example, the conveyance was stable. Further, the belt of Comparative Example 4 was easily detached when the paper was pulled from the side due to a trouble such as a paper jam, but the endless belt of the Example did not come off the pulley.

Test Example 2 Examples 1 to 4 and Comparative Examples 1 to
For the belt No. 3, a passing test of 20,000 sheets was performed.
The coefficient of friction before and after paper passing was compared. The results are shown in Table 2 below.

As a result, in Examples 1 and 2 using EPDM and Example 4 using polyurethane, there was no difference in friction coefficient between before and after paper passing, but in Example 3 using hydrogenated NBR, Coefficient of friction was greatly reduced after paper. Although no problem occurred in polyurethane in this test example, hydrogenated NBR was considered in consideration of long-term durability.
EPDM, especially vulcanization accelerator, from polyurethane and polyurethane
It has been confirmed that it is preferable to use EPDM added in an amount of at least part by weight.

In Comparative Example 1 using EPDM having a rubber hardness of 60 °, the coefficient of friction was small even before paper passing,
Comparative Example 2 using EPDM having a rubber hardness of 15 ° was insufficient in terms of abrasion resistance.

Further, as compared with Example 1 using a normally blended EPDM, an EPDM containing an excessive amount of a vulcanization accelerator was added.
In Example 2 using, it was confirmed that the coefficient of wear was large and the transportability was improved.

[0052]

[Table 2]

(Test Example 3) The belts of Examples 1 and 2 were subjected to a 20,000-sheet passing test, and the wear amount (g) was measured every 5,000 sheets. The result is shown in FIG.

From these results, as compared with Example 1 using a normally blended EPDM, E containing an excessive amount of a vulcanization accelerator was added.
In Example 2 using PDM, it was found that the wear resistance was improved by about 20%.

[0055]

As described above, the endless belt for feeding and conveying according to the present invention uses an elastic woven fabric as the first core,
Since the thread-shaped core is used as the second core and the pulley surface has teeth that mesh with the toothed pulley, an effect of eliminating problems such as uneven transport and rotation delay is exerted.

[Brief description of the drawings]

FIG. 1 is a schematic view of an endless belt for feeding and conveying according to an embodiment of the present invention.

FIG. 2 is a graph showing the results of Test Example 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Endless belt for paper feed conveyance 11 Teeth 12 Groove 13 Core 14 Thread-like core

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 5/02

Claims (9)

(57) [Claims] 1. An endless belt made of a rubber-like elastic body having a rubber hardness of 20 to 50 ° according to JIS A, wherein a thread-like core is provided inside the rubber-like elastic body and a pulley contact surface is provided. It has a plurality of teeth which mesh with the toothed pulley, made of stretch fabric in proximity to the pulley contact surfaces
In addition, the elasticity in the width direction is 1 with respect to the elasticity in the belt length direction.
An endless belt for feeding and transporting paper , wherein a core body of / 5 or less is provided. 2. The stretchable woven fabric according to claim 1 ,
An endless paper feeding and transporting machine characterized in that a warp yarn of a high twist yarn having a high twist number arranged in the belt width direction and a weft yarn of a false twist yarn arranged in the belt length direction are twill-woven. belt. 3. The elastic woven fabric according to claim 2, wherein
The warp arranged in the belt width direction uses a filament yarn of 50d to 150d made of at least a nylon yarn or a polyester yarn, and has a twist number of 200 to 800, which is a high-strength yarn, and the weft arranged in the belt length direction is 10
An endless belt for feeding and transporting, which is a false twisted yarn using a filament yarn of 0d to 200d. 4. The endless belt for feeding and conveying according to claim 1 , wherein the surface has a coefficient of friction of 1.3 or more. 5. The rubbery elastic body according to claim 4 , wherein the rubbery elastic body is EPDM (ethylene / propylene trimer), NBR
(Acrylonitrile-butadiene rubber), hydrogenated NBR and polyurethane, and a rubber hardness of 20 to 50 ° in JIS A according to JIS A. 6. An endless belt made of a rubber-like elastic body having a rubber hardness of 20 to 50 ° according to JIS A, wherein a thread-like core is provided inside the rubber-like elastic body and a pulley contact surface is provided. A core body made of an elastic woven fabric is provided near the pulley contact surface, the elastic body having a plurality of teeth meshing with the toothed pulley, and the elastic woven fabric is provided with a high twist disposed in a belt width direction. The number of warp yarns of high-strength yarn and the weft yarn of the false twist yarn arranged in the belt length direction are twill-woven, and the warp yarn arranged in the belt width direction is
50 consisting of at least nylon or polyester yarn
It is a high-strength yarn having a number of twists of 200 to 800 using a filament yarn of d to 150 d, and the weft arranged in the belt length direction is a false twist yarn using a filament yarn of 100 to 200 d. Endless belt for paper transport. 7. An endless belt made of a rubber-like elastic body having a rubber hardness of 20 to 50 ° in JIS A, wherein said rubber-like elastic body is made of EPDM (ethylene / propylene trimer) and 100 parts by weight of EPDM. And vulcanized by adding at least 6 parts by weight of a vulcanization accelerator to the rubber-like elastic body. Characterized in that a core body made of an elastic woven fabric is provided adjacent to the pulley contact surface, and the surface has a friction coefficient of 1.3 or more. belt. 8. The endless belt for feeding and conveying according to claim 7, wherein the vulcanization accelerator is a thiuram type. 9. An endless sheet feeding and conveying device according to claim 1, wherein said thread-like core is a thread selected from nylon thread, polyester thread, cotton thread and aromatic polyamide thread. belt.