JP4011267B2 - Manufacturing method of endless belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used in image forming apparatuses such as copying machines, printers, and facsimiles. Ru How to manufacture an end belt To the law Related.
[0002]
[Prior art]
Conventionally, in an image forming apparatus such as a copying machine, a printer, and a facsimile machine, a seamless endless belt is used as an intermediate transfer roller of a so-called transfer unit as an intermediate toner carrier of an electrostatic copying process or a recording paper. Used as a fixing belt for fixing toner. This endless belt is manufactured by various manufacturing methods such as a centrifugal molding method, a dipping method, and an extrusion method. For example, in the centrifugal molding method, a flowable molding material is applied to the inner peripheral surface of a cylindrical mold (belt molding mold) by spraying or the like, and the mold is rotated at high speed around the central axis of the cylinder. Thus, the molding material is uniformly diffused by the generated centrifugal force to form a uniform film, and then the uniform film is dried, solidified, and taken out, whereby a seamless endless belt having a cylindrical shape is formed.
[0003]
By the way, when the molded cylindrical endless belt is attached to the transfer unit and operated, the dimensional variation of the drive roller or the endless belt itself, the assembly accuracy, etc. are not good, resulting in sliding during rotation. Due to unevenness or meandering, the belt position may shift, and the belt may wrinkle and the image may be distorted or the belt may break. Therefore, for example, in the prior art, as shown in FIG. 9, a non-shift-preventing detent tape 103 is attached to both sides of the belt base 105 of the endless belt 116 and fixed, and a position shift utilizing a step due to the increased thickness is provided. I was doing prevention. Further, in order to increase the fixing strength of the tape, as disclosed in JP-A-9-165120, the tape is sewn with a thread.
[0004]
However, it is difficult to attach the detent tape 103 to the belt base 105 of the endless belt 116 having elasticity and flexibility that has already been molded and removed from the mold. Mass production equipment was needed.
[0005]
In addition, according to the method in which the tape is sewn with the thread, the number of processes increases and the manufacturing efficiency deteriorates. Moreover, fixing by this method is effective for a belt made of a material having high elasticity such as rubber, but is not suitable for a belt made of a material such as plastic having a low elasticity and tear strength. In particular, materials such as polyimide and polyamideimide have excellent properties as a belt, but have low tear strength, and are not suitable for fixing a tape by a method of sewing with a thread.
[0006]
Therefore, the present inventors have already proposed a method of integrally forming a detent tape at the time of forming the belt and a belt formed by the method. According to the fixing method of the detent tape by the integral molding, it is possible to obtain the tape fixing suitable for the belt made of a plastic material having low elasticity and tear strength.
[0007]
[Problems to be solved by the invention]
However, in recent years, in order to improve image quality, the elasticity of the surface of the transfer body has been increased, and the crushing caused by the nip of the roller or belt during transfer has been increased to ensure a contact area. Has become the mainstream with a multi-layer structure in which a highly elastic material is laminated on a substrate.
[0008]
In the case of forming a belt having such a configuration, a high elastic material such as rubber is applied to the surface of the already formed belt base 105 to form a high elastic material layer 102 on the surface, and heat curing is performed. At this time, the cylindrical support 104 is inserted into the hollow interior of the hollow cylindrical belt base 105 so that the flexible belt base 105 does not bend (see FIG. 10).
[0009]
However, if there is a step or the like due to the detent tape 103 on both sides of the belt base 105, there is a difference in the inner diameter of the belt (the diameter of the circle with the inner circumference being the circumference) between the center in the belt width direction and the both sides. There was a problem that the body 104 could not be inserted smoothly. As shown in FIG. 10, when the outer diameter of the support 104 is matched with the inner diameter of both sides including the thickness of the detent tape 103 on both sides, the center portion has a gap between the outer diameter of the support 104 and the belt inner diameter. A gap is created. As a result, the central portion in the belt width direction is loosened, and the belt bends when a high elastic material such as rubber is applied to the belt surface, or when the high elastic material layer 102 such as rubber applied to the surface is heated and cured. Also, there is a problem that the belt is deformed into a drum shape by the curing shrinkage.
[0010]
The present invention has been made in view of the above circumstances, has no step due to misalignment prevention, etc., has a uniform belt thickness as a whole, and is free from twists and wrinkles even if meandering or belt deviation occurs. Endless bell with mechanical strength that does not occur To Manufacturing method The law The issue is to provide.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention according to claim 1 has reinforcing fibers extending in a circumferential direction in which the fiber direction is orthogonal to the width direction on both sides in the width direction, and has reinforcing fibers. A method of manufacturing an endless belt having a uniform thickness from one side to the other of both sides in the width direction including a portion, wherein a reinforcing fiber immersed in a belt raw material solution or a solvent on an outer peripheral surface of a cylindrical member A cylindrical member is inserted from the end of a molding die for forming an endless belt, wound along the circumferential direction, and the inserted cylindrical member is Relative to the mold The reinforcing fibers wound around the columnar member by rotating and utilizing the centrifugal force are repelled from the columnar member and adhered to the inner surface of the mold.
[0017]
According to the first aspect of the present invention, the reinforcing fiber immersed in the belt raw material liquid or the solvent is wound around the outer peripheral surface of the columnar member, so that the reinforcing fiber can be easily wound without being twisted or bent. . Furthermore, the cylindrical member Relative to mold By rotating and utilizing centrifugal force, the reinforcing fibers are pushed away from the cylindrical member and stuck to the inner surface of the mold, so that the reinforcing fiber is automatically kept in a state where the cylindrical member is wound in an orderly manner. Can be attached to the inner surface of the mold.
[0028]
[ Invention Embodiment]
FIG. And nothing 1 is a schematic perspective view of a digital copying machine 109 as an image forming apparatus provided with an end belt. The digital copier 109 illuminates and scans an original image inside thereof, reads a reading unit 110 that reads image information, and writing that forms an image on a recording sheet 112 based on image data sent from the reading unit. Part 111.
[0029]
As shown in FIG. 8, the writing unit 111 is generally composed of a laser unit 113, a photosensitive drum 114, a toner unit 115, a transfer roller 119, a transfer belt 1, a fixing roller 117, and a fixing belt 118. Based on the image data sent from the reading unit 110, the laser unit 113 scans and irradiates the photosensitive drum 114 with a laser, and the photosensitive drum 114 is charged corresponding to the image to be formed. Toner is supplied from the toner unit 115 to the charged portion of the photosensitive drum 114, and the toner is transferred to the transfer belt 1 through the photosensitive drum 114, transferred from the transfer belt 1 onto the recording paper 112, and recorded. An image is formed on the paper 112. The toner transferred from the transfer belt 1 to the recording paper 112 is heated and pressed by the fixing roller 117 and the fixing belt 118 and fixed on the recording paper 112.
[0030]
According to the present invention Obtained by manufacturing method The endless belt is used as both the transfer belt 1 and the fixing belt 118. In this embodiment, the case where the endless belt is used as the transfer belt 1 will be described.
[0031]
FIG. 1 shows a schematic configuration diagram of a transfer belt 1 used in a digital copying machine 109 as the image forming apparatus. In this transfer belt 1, a high elastic material layer 2 made of rubber or the like is formed on the surface of a belt base 5 formed of a plastic material such as polyimide. Since this transfer belt 1 has a highly elastic material layer 2 on the surface, it is possible to increase the crushing at the time of nip, to ensure a large contact area with the recording paper and the roller, and to enable highly accurate conveyance. Therefore, it is possible to contribute to high image quality.
[0032]
The belt substrate 5 has a uniform thickness t1 as a whole. The thickness t2 of the highly elastic material layer 2 formed on the belt surface is also uniform as a whole. Therefore, the belt thickness is the whole belt despite having reinforcing fibers 3 on both sides in the width direction as will be described later. As a uniform thickness t = t1 + t2. In the formation of the highly elastic material layer 2 on the belt surface, as shown in a schematic perspective view in FIG. 2, a belt inner diameter dimension (a diameter of a circle having an inner circumference length as a circumference) is approximately inside the hollow base 5. After inserting a cylindrical support 4 having the same outer diameter, a highly elastic material is applied to the surface of the belt base 5 and heat-cured. Here, since the thickness t1 of the belt base 5 is uniform as a whole, the inner diameter of the belt is also uniform as a whole of the belt, and the support 4 can be smoothly inserted into the hollow interior of the belt base 5 without being caught. Can be inserted into. In addition, since no gap is formed between the inner diameter of the belt base 5 and the outer diameter of the support 4, the highly elastic material can be applied satisfactorily without the belt base 5 being loosened. Even when the highly elastic material layer 2 applied to the surface of the belt base 5 is heat-cured, there is no gap between the outer diameter of the support 4 and the inner diameter of the belt base 5, so the belt shrinks due to the curing shrinkage. Is not deformed (see FIG. 3).
[0033]
Reinforcing fibers 3 are disposed on both sides of the transfer belt 1 in the width direction. A method of manufacturing the transfer belt 1 in which the reinforcing fibers 3 are arranged will be described later. However, since the reinforcing fibers 3 are arranged on both sides, the transfer belt 1 has a strong mechanical strength against an external force such as tearing. In addition to being difficult to twist, even if meandering or belt slippage occurs, twisting and wrinkling do not occur. Since the reinforcing fibers 3 are arranged straight without being twisted or bent, and the spaces between the fibers are arranged in an orderly manner, even if there is a tear, the tear proceeds in the belt width direction. There is nothing.
[0034]
4 and 5 (a) to 5 (e) show an embodiment of a method for producing an endless belt according to the present invention. The endless belt manufactured by this manufacturing method has the high elastic material layer 2 formed on the surface thereof, and is used as the transfer belt 1 in the writing unit 111 of the digital copier 109.
[0035]
In FIG. 4, the code | symbol 11 is a ring as a cylindrical member. The outer diameter shape of the ring 11 is a stepped columnar shape in which a large-diameter portion 11a and a small-diameter portion 11b whose diameter is slightly smaller than the large-diameter portion 11a for winding the reinforcing fiber 3 are formed. A hollow portion 11c is formed in the center portion for inserting a coating nozzle described later. A reinforcing fiber 3 having a length corresponding to the circumferential length of the small-diameter portion 11b, for example, a length corresponding to approximately one round, Small diameter part A predetermined number is wound around 11b. Since the reinforcing fiber 3 is preliminarily immersed in a liquid belt base material (belt raw material liquid) or a solvent, the reinforcing fiber 3 can be easily tightly wound around the small diameter portion 11b and easily slipped off or peeled off. There is no. Since it is wound along the small diameter part 11b, the reinforcing fiber 3 Can be wound with a regular spacing between fibers without twisting or bending. The fiber diameter of the reinforcing fiber 3 is smaller than the thickness t1 of the belt base 5, and even when the reinforcing fiber 3 is wound around the small diameter portion 11b, the outer diameter of the wound portion is larger than the outer diameter of the large diameter portion 11a. small.
[0036]
Reinforcing fiber 3 Is wound around the small diameter portion 11b, 5 A ring 11 is inserted into a forming die 12 for forming a belt as shown in FIG. The molding die 12 has a substantially hollow cylindrical shape, and its inner diameter is formed substantially the same as the outer diameter of the large-diameter portion 11a of the ring 11 so that the ring 11 can be fitted therein. Furthermore, since the outer diameter of the portion where the reinforcing fiber 3 is wound around the small diameter portion 11b of the ring 11 is smaller than the outer diameter of the large diameter portion 11a, the reinforcing fiber 3 does not touch the inner surface 12a of the mold 12, The ring 11 can be inserted into the mold 12 smoothly.
[0037]
After setting the ring 11 in place, 5 As shown in FIG. 1 Rotate at high speed around the center axis of the cylinder indicated by the dotted line. As a result, the reinforcing fiber 3 wound around the small diameter portion 11b is repelled from the small diameter portion 11b by the action of centrifugal force and sticks to the inner surface 12a of the mold 12 (see FIGS. 5C and 6). At this time, if the ring 11 is formed of a release material or a release layer is formed on the surface of the ring 11, and the small diameter portion 11 b of the ring 11 has releasability, the reinforcing fiber 3 can be removed from the small-diameter portion 11b more smoothly. Since the reinforcing fiber 3 automatically sticks to the inner surface 12a of the mold by the action of centrifugal force, the reinforcing fiber 3 sticks to the inner surface 12a with almost no disturbance while keeping the order of the state wound around the small diameter portion 11b, and twists or bends. It is closely attached to the inner surface 12a.
[0038]
Further, at this time, the ring 11 and the mold 12 may be integrated and rotated with the rotation speed synchronized, or the ring 11 and the mold 12 are given optimum rotation speeds at different rotation speeds. It may be rotated.
[0039]
After the reinforcement fiber 3 has been attached to the inner surface 12a, the nozzle 14 is inserted from the cavity 11c of the ring 11, and as shown in FIG. 5 (d), the liquid belt is directed toward the inner surface 12a of the mold 12. A base material (belt raw material) is applied. Since the coating is performed while the mold 12 is rotated, the belt raw material liquid is uniformly diffused, and the belt base 5 having a uniform thickness t1 is formed. At this time, since the ring 11 functions as a blocking member for preventing the belt raw material liquid from leaking out of the mold 12, the belt raw material liquid does not leak out of the mold 12.
[0040]
Here, since the fiber diameter of the reinforcing fiber 3 is smaller than the thickness t1 of the belt base 5, the thickness of the belt base 5 does not become thicker in the part having the reinforcing fiber 3 than in other parts. It is formed as a uniform thickness t1 as a whole.
[0041]
When the formation of the belt base 5 is completed, the belt base 5 is dried and heat-cured by heating with a heater (not shown), and then the rotation of the mold 12 and the ring 11 is stopped to remove the ring 11 (FIG. 5 (e )), The belt base 5 is taken out of the mold 12. The formed belt base 5 has reinforcing fibers 3 on both sides in the belt width direction, and the thickness thereof is a uniform thickness t1 for the entire belt.
[0042]
A highly elastic material is applied to the surface of the belt base 5 formed in this way and cured by heating to form a highly elastic material layer 2 having a uniform thickness t2, and an endless surface having a high elasticity material layer on the surface. A belt is prepared and used as the transfer belt 1.
[0043]
In the above embodiment, in the step of applying the belt raw material liquid, the ring 11 is also used as a damming member for preventing the belt raw material liquid from leaking out of the mold 12, but the reinforcing fibers 3 Of course, the ring 11 may be removed and another damming member may be inserted from both sides of the mold 12 to apply the belt raw material liquid.
[0044]
[Example 1]
A PBO (polybenzobisoxazole) fiber soaked in a solvent DMAC (dimethylacetamide) was wound around a small diameter portion of a ring made of a fluororesin having a diameter of a large diameter portion of φ60 mm and a diameter of a small diameter portion of φ58 mm.
[0045]
It was difficult to apply the fiber because it slipped as if it were only the fiber, but the wet fiber was wound tightly. Therefore, the two rings were set at both ends inside a cylindrical coating die (belt forming die) formed of aluminum having an inner diameter of φ60 mm and rotated at a high speed of 2G or more. When the rotation was stopped and the ring was removed, the fibers stuck to the inner surface of the coating mold and did not fall.
[0046]
Therefore, after inserting a weir member at both ends of the coating mold and applying a solution of the thermoplastic resin polyamideimide (diluted solution of solvent DMAC), the coating film is made uniform while rotating at high speed, and further at 80 ° C. The solvent was dried, and then the rotation was stopped, the mold was taken out, transferred to a heating furnace, and heated at 200 ° C. to completely remove the solvent.
[0047]
After the coating film was fully cured, it was cooled and the belt film (belt substrate) was taken out from the coating mold, but the fibers were buried in the film on both sides of the belt and adhered completely. It was the same.
[0048]
The belt membrane thus prepared was cut into a belt circumferential direction 50 mm × belt width direction 20 mm as a sample at a portion including the fiber, and a 5 mm slit was made with a pair of scissors so as not to cut the fiber, and the belt film was pulled in the fiber direction. The tear strength was measured.
[0049]
When the maximum strength of the belt substrate is exceeded, the sample tear begins to expand and the tension decreases, but when the tear reaches the fiber part, the tension rises again. When the strength exceeded the peak value, it was split at a stretch, but the maximum strength at that time was 800 kgf / cm ² (7.85 × 10 ⁷ N / m ² )Met.
[0050]
[Example 2]
A PBO fiber dipped in a polyamic acid solution (diluted solution of solvent DMAC) was wound around the same fluororesin ring as in Example 1. The solution was made so as not to drip or fall from the fiber. The damp fiber wrapped tightly.
[0051]
Therefore, the two rings were set on both sides of the same aluminum cylindrical coating mold as in Example 1 and rotated at a high speed of 2G or more.
[0052]
When the rotation was stopped and the ring was removed, it was confirmed that the fibers were stuck to the inner surface of the coating mold and did not fall.
[0053]
Therefore, the ring was also used as a damming member as it was, and after the polyamic acid solution (solvent DMAC 30% dilution) was applied to the inner surface of the coating mold, the coating film was made uniform while rotating at high speed. Furthermore, after drying the solvent at 80 ° C., the rotation was stopped, the mold was taken out, transferred to a heating furnace, first heated at 150 ° C. to completely remove the solvent, and then heat-cured at 300 ° C.
[0054]
After the coating film was fully cured, it was cooled and the belt film was taken out of the mold, but the fibers were buried in the film on both sides of the belt and were completely adhered.
[0055]
The tear strength of the belt film thus prepared was measured by the same method as in Example 1.
[0056]
When the maximum strength of the belt substrate is exceeded, the sample tear begins to expand and the tension decreases, but when the tear reaches the fiber part, the tension rises again. When the strength exceeded the peak value, it was split at a stretch, but the maximum strength at that time was 1000 kgf / cm ² (9.81 × 10 ⁷ N / m ² )Met.
[0057]
[Comparative Example 1]
A polyamide-imide solution endless belt having no reinforcing members on both sides was formed by centrifugally applying a polyamide-imide solution of the same material as in Example 1 using the same aluminum cylindrical coating die as in Example 1. .
[0058]
The belt film formed in this manner was cut into a sample with a size of 50 mm in the belt circumferential direction and 20 mm in the belt width direction, cut into 5 mm with scissors, and pulled in the long side direction to measure the tear strength.
[0059]
When the maximum strength was exceeded, the tearing of the sample began to expand and at the same time the tension decreased. The tension continued to decrease without increasing, and when it broke, it immediately became zero. The difference between the maximum strength at that time and the tensile tension until breakage is 300 kgf / cm. ² (2.94 × 10 ⁷ N / m ² )Met.
[0060]
[Comparative Example 2]
The polyamic acid solution of the same material as in Example 2 was centrifuged by using the same aluminum cylindrical coating mold as in Example 1 to form an endless belt made of polyimide resin that does not use reinforcing members on both sides.
[0061]
The belt film formed in this manner was cut into a sample with a size of 50 mm in the belt circumferential direction and 20 mm in the belt width direction, cut into 5 mm with scissors, and pulled in the long side direction to measure the tear strength.
[0062]
When the maximum strength was exceeded, the tearing of the sample began to expand and at the same time the tension decreased. The tension continued to decrease without increasing, and when it broke, it immediately became zero. The difference between the maximum strength at that time and the tensile tension until breakage is 300 kgf / cm. ² (2.94 × 10 ⁷ N / m ² )Met.
[0063]
[Comparative Example 3]
In the same aluminum cylindrical coating mold as in Example 1, a polyimide precursor solution (trade name: Torayis well 3000 manufactured by Toray Industries, Inc.), a solution obtained by diluting carbon black as a conductive agent in a solvent DMAC to 30%, Was applied in advance, the coating film was made uniform while rotating at high speed, and the solvent was further dried at 80 ° C. Thereafter, the rotation was stopped, the mold was taken out, transferred to a thermostat, and first heated at 100 ° C. to completely remove the solvent and perform preliminary imidization.
[0064]
Then, both sides of the belt are masked with a width of 5 mm, dammed, and a few strips of PBO fibers are attached to the area between them. Then, a polyimide precursor solution is applied, and after heating solvent drying, a 0.5 mm film is formed. Further, complete curing was performed by heating at a temperature of 300 ° C.
[0065]
When the coating film was sufficiently cured and then cooled and the belt film was taken out of the mold, the detent portions laminated on both sides of the belt were completely adhered. Even if the stopper part was forcibly peeled off from the belt, the belt and the stopper part were not torn in the axial direction even though they were torn in the circumferential direction.
[0066]
The belt film thus created is cut into a belt circumferential direction 50 mm × belt width direction 20 mm as a sample at the portion including the fiber, and a 5 mm slit is made with a pair of scissors so as not to cut the fiber. The tear strength was measured by pulling.
[0067]
When the maximum strength of the belt substrate is exceeded, the sample tear begins to expand and the tension decreases, but when the tear reaches the fiber part, the tension rises again. When the strength exceeded the peak value, it was split at a stretch, but the maximum strength at that time was 1000 kgf / cm ² (9.81 × 10 ⁷ N / m ² )Met.
[0068]
[Belt use experiment]
Using the belts of Examples 1 and 2 and Comparative Examples 1 to 3 as bases, each was inserted into a support, and while rotating, a silicone rubber coating solution was applied by spray coating, and the silicone rubber elastic layer was 0.5 mm. And a fixing belt was prepared by forming a fluororesin layer of about 1 μm.
[0069]
In Examples 1 and 2 and Comparative Examples 1 and 2, there was no deformation of the belt, and a good elastic laminated belt could be produced. However, in Comparative Example 3, a dent was formed in the central portion, resulting in a drum shape.
[0070]
These samples were attached to a fixing belt unit of a full-color copying machine, and a heat and heat cycle was repeated while outputting an image to evaluate the durability of the belt.
[0071]
The belt of Comparative Example 3 was difficult to attach to the unit, and when it was forcibly attached, the tension at the center was strong and loosened at both ends, and the wrinkle began to rotate and stopped.
[0072]
The belts of Comparative Examples 1 and 2 had no problem when they were rotating smoothly, but there were no problems with more than 50,000 sheets. The belt broke and could not be used.
[0073]
In the belts of Examples 1 and 2, even if a crack occurs, the crack stops at the fiber portion, and the crack in the axial direction does not progress any further, and the belt shape and copy quality can be improved even after repeating 50,000 sheets. No abnormality occurred.
[0074]
【The invention's effect】
According to the present invention, the reinforcing fibers soaked in the belt raw material solution or the solvent are wound around the outer peripheral surface of the cylindrical member, so that the reinforcing fibers can be easily wound without being twisted or bent. Furthermore, the cylindrical member Relative to mold By rotating and utilizing centrifugal force, the reinforcing fibers are pushed away from the cylindrical member and stuck to the inner surface of the mold, so that the reinforcing fiber is automatically kept in a state where the cylindrical member is wound in an orderly manner. Can be attached to the inner surface of the mold. Therefore, since both sides have reinforcing fibers, the mechanical strength is strong against external forces such as tearing, and the belt thickness is uniform as a whole. An endless belt that can be formed can be obtained.
[Brief description of the drawings]
FIG. 1 shows the present invention. Obtained by the manufacturing method according to Transfer belt Partially broken perspective FIG.
FIG. 2 is a diagram showing one form of a manufacturing process of the transfer belt shown in FIG. 1 and showing a process of forming a highly elastic material layer on the belt base. A support is inserted into the belt base and It is a schematic perspective view which shows a mode that a highly elastic material is apply | coated.
FIG. 3 is an axial cross-sectional view showing a state in which the step shown in FIG. 2 has been completed and a highly elastic material layer has been formed on the surface of the belt substrate.
4 is a schematic perspective view showing one form of a manufacturing process of the transfer belt shown in FIG. 1 and showing a winding process in which reinforcing fibers are wound around a small diameter portion of a ring as a cylindrical member.
5A and 5B are diagrams showing an embodiment of a manufacturing process of the transfer belt shown in FIG. 1, wherein FIG. 5A is an axial sectional view showing an insertion process for inserting the ring into a belt mold, and FIG. 5B is a rotation of the ring. FIG. 4C is an axial sectional view showing a pasting process in which the reinforcing fiber is flipped off from the outer peripheral surface of the ring and pasted to the inner surface of the belt mold, and FIG. 10C is a diagram illustrating the pasting process completed, and the reinforcing fiber is pasted to the inner surface of the belt mold. (D) is an axial cross-sectional view showing a state in which the coating process for applying the belt raw material is performed while rotating the belt forming die, and (e) is a belt base formed. It is an axial sectional view showing the process of removing the ring later.
FIG. 6 is a cross-sectional view in a direction perpendicular to the axial direction showing how reinforcing fibers wound around the outer peripheral surface of the small diameter portion of the ring are repelled from the outer peripheral surface of the small diameter portion of the ring by rotational centrifugal force and stick to the inner surface of the belt mold The left figure shows the cross section of the small diameter part of the ring in FIG. 5B, and the right figure shows the cross section of the small diameter part of the ring in FIG. 5C.
[Fig. 7] Nothing 1 is a schematic perspective view of a digital copier as an image forming apparatus including an end belt.
FIG. 8 7 2 is a schematic configuration diagram showing an internal structure of the digital copier shown in FIG.
[Fig. 9] A conventional endless belt with a stopper tape attached Partially broken perspective FIG.
10 shows a state in which a support is inserted into the conventional endless belt shown in FIG. 9 and a high elastic material layer is formed on the endless belt surface. Shaft FIG.

Claims (1)

On both sides in the width direction, the fiber direction has reinforcing fibers extending in the circumferential direction orthogonal to the width direction, and the thickness is from one side to the other side of the width direction both sides including the portion having the reinforcing fibers. A method for producing a uniform endless belt,
Wrap the reinforcing fiber soaked in the belt raw material solution or solvent around the outer peripheral surface of the cylindrical member along the circumferential direction,
Insert the cylindrical member from its end into a mold for molding the endless belt,
By rotating the inserted columnar member relative to the mold and utilizing centrifugal force, the reinforcing fibers wound around the columnar member are repelled from the columnar member to remove the mold. A method for producing an endless belt, characterized by being attached to an inner surface.

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