JP2002087568A - Meandering preventing guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent peeling of a meandering preventing guide of an endless belt used for a printer or the like. SOLUTION: For preventing the meandering of the endless belt, a sticking layer is disposed on at least one adhering layer of both ends as joints of the meandering preventing guide disposed on the inner peripheral surface of the belt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide for preventing meandering of an endless belt used for a belt driving device such as a transfer device such as a copying machine, a printer, a facsimile, an intermediate transfer device, a developing device, and a transfer separation device.

[0002]

2. Description of the Related Art Conventionally, in attaching a meandering prevention guide to an endless belt, it has been difficult to attach the guide material seamlessly. A linear type guide member having a length corresponding to the circumference is attached. In this case, a seam of the guide material will be generated at one place, and when the endless belt is driven and rotated, the bending and expansion / contraction force is continuously applied to the guide material provided on both sides,
In some cases, the peeling-off is more likely to occur than at the seam, and furthermore, the entire guide material is peeled off. In such a case, it is necessary to improve the bonding strength of the guide member to the belt as a whole, but when an adhesive layer is provided, it is selected according to the rubber material, which is the main component of the guide member, and the material of the endless belt. The thickness of the adhesive and applied thickness is limited, and it is difficult to substantially increase the adhesive strength. In the case of providing an adhesive layer, it is possible to improve the adhesive strength against floating by changing the configuration of the adhesive layer, but in general, the thickness of the adhesive layer becomes thicker or softer For this reason, there has been a problem that, as the driving rotation is repeated, the belt is continuously applied with a force to move in the lateral direction, so that the guide member is shifted or peeled in the lateral direction.

SUMMARY OF THE INVENTION In the present invention, when the endless belt is driven and rotated, the bending / extension force applied to the meandering prevention guide provided on the belt and the lateral displacement are caused. It is an object of the present invention to provide a meandering prevention guide that simultaneously improves the adhesive strength and prevents the guide from floating and peeling off.

[0003]

According to the present invention, there is provided a meandering prevention guide provided on an inner peripheral surface of an endless belt via an adhesive layer in order to prevent meandering of the endless belt. A meandering prevention guide, wherein an adhesive layer is provided on at least one of the portions.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The meandering prevention guide of the present invention is a linear type guide provided with an adhesive layer uniformly, and has an effect of further increasing the adhesive force at one end or both ends thereof. By providing a new adhesive layer,
Even if bending and expansion and contraction are repeated, floating is hardly caused by the adhesive force of the end, and the guide is shifted laterally because the soft and thick adhesive layer weak to the lateral force is limited to the end. This makes it possible to continuously drive and use the apparatus without using it. The present invention also includes a mode in which the adhesive layer is not provided on the entire surface of the linear type guide, but an adhesive layer is provided directly on the end of the guide, and the adhesive layer is provided on other portions.

The material of the guide body of the meandering prevention guide according to the present invention may be an elastomer-based material such as a conventionally used polyurethane rubber or silicone rubber. Among them, polyurethane rubber excellent in abrasion resistance and adhesiveness is preferable.

As the adhesive applied to the guide body, a rubber-based adhesive, an acrylic-based adhesive, a hot-melt type adhesive, or the like can be used. However, since the guide body and the endless belt are adhered to each other, depending on their materials, , Will be selected purposefully. The adhesive in the present invention includes an adhesive generally called a pressure-sensitive adhesive, and the adhesive strength between the guide body and the endless belt is a point for selecting the adhesive. It can be said that the larger the adhesive strength is, the more preferable it is. However, in practice, the tensile shear adhesive strength is 0.2 to 1.0 N / m.
m ² . In order to evaluate the tensile shear adhesive strength of the pressure-sensitive adhesive, it is necessary to consider the deviation. Due to the nature of the adhesive, a lateral shift occurs before the meandering prevention guide peels off from the endless belt. In practical use, this lateral displacement also poses a problem as in the case of peeling. Therefore, in the present invention, the lateral displacement was evaluated by the method described in Examples. It is practically necessary that the magnitude of the lateral displacement is 1.0 mm or less when the tensile strength in the shear direction is 2.0 N / mm. Specific examples of the adhesive include a rubber-based adhesive when the material of the guide body is polyurethane and the material of the endless belt is a fluororesin.

The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer of the present invention is different from the pressure-sensitive adhesive of the above-mentioned pressure-sensitive adhesive layer. In particular,
Acrylic, rubber, silicone / acrylic and the like can be used, and silicone / acrylic pressure-sensitive adhesives are particularly useful. The peel strength of the adhesive layer needs to be larger than the peel strength of the adhesive layer, and is 0.08 to 1.30 N.
/ Mm. If the peel adhesive strength is less than 0.08 N / mm, the effect of preventing peeling is not sufficient.

The effect of the newly formed adhesive layer can be obtained by providing a single layer at the end of the guide member, but the present invention is not limited to this. The same applies to the case where a double-sided tape type or a single-sided tape type is bonded. The effect of is obtained. As a method of applying the adhesive layer, in a state of the sheet with an adhesive layer which is a stage before cutting, a method of applying an adhesive layer to a portion corresponding to an end portion of the guide material and cutting to a target guide material size, or There is a method of applying an adhesive layer after being cut into a guide material.

The length (in the circumferential direction) of the adhesive layer laminated on the adhesive layer of the guide material is 1 to 10% of the entire length of the meandering prevention guide.
It is. Longer is preferable to prevent peeling,
If it exceeds 10%, lateral displacement may occur, and if it is less than 1%, the effect of preventing peeling cannot be sufficiently obtained. A practically preferable length of each adhesive layer is 3 to 30 mm. The thickness of the adhesive layer is such that the peel adhesive strength is 0.08 N / m.
m is preferable if it can be obtained more than m.
It is 30 to 200 μm. If it exceeds 200 μm, lateral displacement, peeling from a step, etc. may occur, which is not preferable.

The endless belt is made of polycarbonate,
It is made of a material based on polyvinylidene fluoride, ethylene tetrafluoroethylene copolymer, polyimide or the like. Further, the meandering prevention guide of the present invention can be preferably applied to an endless belt to which carbon black or the like is added for the purpose of imparting conductivity and semi-conductivity to these materials.

[0011]

EXAMPLES The measuring methods and evaluation methods in the examples are as follows. <Peel adhesion strength> A sheet (60 × 20 mm) sample is cut out from an endless belt on which a meandering prevention guide having a width of 5 mm is attached, and the end of the guide is cut out. The peel adhesion strength between the end and the endless belt was measured. A side opposite to the end of the meandering prevention guide is slightly peeled off and lifted, and the peeled guide and the belt are chucked to be subjected to tension measurement. The film was peeled off by pulling at a constant speed, and the peel adhesive strength was measured. Measuring machine: Shimadzu AUTOGRAPH AG-50
0E Pulling speed: 30mm / min

<Horizontal deviation> A sheet-like (2) is formed from the end of the endless belt to which the meandering prevention guide having a width of 5 mm is attached.
The guide and the belt were pulled in a shearing direction by a tensile measuring machine, and the displacement at each strength was measured while gradually increasing the tensile strength. Measuring machine: Shimadzu AUTOGRAPH AG-50
0E Tensile speed: 10mm / min

<Durability> The durability of the endless belt was evaluated by setting the driving conditions of the endless belt in an actual printer in such a condition that peeling and lateral displacement were likely to occur. Four endless belts each having a meandering prevention guide attached to both ends on the inner peripheral surface side of the belt were used. Environment: Environment 1 33 ° C, 80% Environment 2 10 ° C, 20% Belt drive speed: Approx. 2 times normal Belt tension: Approx. 2 times normal Set belt so that it moves to one side

Embodiment 1 Guide body + adhesive layer Urethane with natural rubber-based adhesive Size: 5 mm wide × 1.3 mm high × 710 mm long Adhesive layer Silicone / acrylic double-sided tape (8625HPW manufactured by Dainippon Ink and Chemicals, Inc.) is applied to both ends of the guide material at 10 mm
Laminated part. Size: width 5mm x height 0.1mm x length 10mm Endless belt Ethylene tetrafluoroethylene copolymer (MFR =
(2.5 g / 10 min), 15% by weight of acetylene black was uniformly dispersed and extruded seamlessly. Size: circumference 711 mm x width 320 mm Attaching the guide body Attach the above meandering prevention guides (1. guide body + adhesive layer + 2. adhesive layer) to both ends on the inner circumferential surface side of the belt in the direction perpendicular to the endless belt surface movement direction while pressing with an even load. Was. 5. Evaluation Table 1, Table 2, and Table 3 show the results of measuring and evaluating the peeling adhesive strength, lateral displacement, and durability between the meandering prevention guide and the endless belt.

(Comparative Example 1) Adhesion durability between the meandering prevention guide and the endless belt was evaluated using the meandering prevention guide similar to that of Example 1 except that the adhesive layer was not laminated (no adhesive layer). It was shown to.

(Comparative Example 2) Using the same meandering prevention guide as in Example 1 except that the adhesive layer was laminated on the entire surface of the adhesive layer, the adhesion durability between the meandering prevention guide and the endless belt was evaluated. Indicated.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

[Table 3]

[0020]

The meandering prevention guide of the present invention is less likely to float or peel off from the vicinity of both ends of the guide material serving as a seam of the guide material, and can prevent lateral displacement and peeling of the entire meandering prevention guide.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a meandering prevention guide according to the present invention.

[Explanation of symbols]

 1 Guide material 2 Adhesive layer 3 Adhesive layer

Claims (4)

[Claims] 1. To prevent meandering of an endless belt,
A meandering prevention guide provided on an inner peripheral surface of the belt via an adhesive layer, wherein an adhesive layer is provided on at least one of both ends of the guide serving as a seam of the guide. 2. The meandering prevention guide according to claim 1, wherein the length of the adhesive layer is 1 to 10% of the entire length of the meandering prevention guide. 3. The meandering prevention guide according to claim 1, wherein the length of the adhesive layer is 3 to 30 mm. 4. The peel strength of the pressure-sensitive adhesive layer is 0.08-1.
The meandering prevention guide according to any one of claims 1 to 3, wherein the guide is 30 N / mm.