JP2011000740A - Method and apparatus for ultrasonic joining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing an endless belt from a molding difficult resin such as a composition in which a conductive filler such as carbon black is dispersed in a molding difficult matrix resin mainly containing a polyarylate.SOLUTION: The apparatus for producing the endless belt from a resin film containing the conductive filler has (a) a first ultrasonic horn 21 which has an annular groove 22 on a flat upper surface 21a and is rotated, a roll 24 which is engaged with the annular groove 22 and follows, an ultrasonic welding/fusing device having a conveyance stand 26 movable in the tangential direction of the first ultrasonic horn 21, and (b) an ultrasonic device having a contact stand 41 having a flat upper surface 41a and a second ultrasonic horn 42. Between the annular groove 22 of the first rotating ultrasonic horn 21 and the following roll 24, the protrusion of a resin film F is ultrasonically welded linearly through the protrusion of the resin film F and fused, and then an ultrasonic fusion part is flattened.

Description

  The present invention relates to a method and an apparatus for manufacturing an endless belt suitable for a transfer belt used in a color image forming apparatus such as an electrostatic copying machine or an electrostatic printer.

  In a color image forming apparatus that forms a color image by laminating and transferring a plurality of toner images, such as a color electrostatic copying machine or a color electrostatic printer, an intermediate transfer belt (a toner image formed on a photosensitive member) A belt that is transferred before transfer onto a transfer material such as paper) or a transfer conveyance belt (a transfer material such as paper is electrostatically adsorbed and conveyed, and a toner image formed on a photoconductor is directly transferred. Belts used for this purpose).

  The transfer belt is required to have mechanical strength, creep resistance, toughness, yield elongation, flexibility, dimensional stability, heat resistance, flame retardancy, low cost, and the like, and is preferably seamless. To date, fluororesins, polyolefins, polycarbonates, polyesters (eg, polyethylene terephthalate, polybutylene terephthalate), polyimides, and the like have been used for transfer belts, but these do not satisfy all of the above requirements.

  Under such circumstances, various transfer belts using polyarylate resin have been proposed recently. For example, Japanese Patent Application Laid-Open No. 2000-137389 (Patent Document 1) discloses an endless belt by extruding a molten resin containing at least a polyarylate resin into a tubular shape from an annular die provided in an extruder and molding the molten resin into a predetermined shape by an inflation method. Has proposed a method of manufacturing a cylindrical transfer member. Polyarylate is promising as a resin that satisfies the above requirements, and is expected to be put to practical use. However, as a result of diligent investigation, polyarylate itself is very inferior in moldability and contains a large amount of carbon black, so it is necessary to make a polyarylate tubular extruded product into a film with a uniform film thickness by the inflation method. I found it virtually impossible.

JP 2000-137389 A

  Accordingly, an object of the present invention is to produce an endless belt from a material having a very poor moldability, such as a composition obtained by dispersing a conductive filler such as carbon black in a hard moldable matrix resin mainly composed of polyarylate. It is an object to provide a method and apparatus.

  As a result of diligent research in view of the above object, the present inventor found that when a hard-formable resin film is passed between a rotating ultrasonic horn and a driven roll, the straight line is formed even for the hard-formable resin film. The present inventors have found that an endless belt made of a hard-to-mold resin film can be obtained stably by performing ultrasonic welding fusing in a stable manner, and have arrived at the present invention.

  That is, in the first method of the present invention for producing an endless belt from a resin film containing a conductive filler, the first ultrasonic horn having an annular groove on a flat upper surface is rotated, and the annular groove is formed in the annular groove. The resin film is ultrasonically welded, melted and bonded by passing the vicinity of both ends of the resin film which is engaged and driven by a roll between the annular groove and the driven roll. The ultrasonic fusing part is opened and held on the flat surface of the abutment base, and the ultrasonic fusing part is flattened by moving the second ultrasonic horn while pressing the second ultrasonic horn along the ultrasonic fusing part. And

  In the first method, the annular groove has a V-shaped inclined surface, and the driven roll has an inclined roll surface, and a two-layer stack that enters between the annular groove and the driven roll. It is preferable that the resin film is pressed by the inclined roll surface of the driven roll and the V-shaped inclined surface of the annular groove, welded and melted.

  In the first method, the first ultrasonic horn is preferably rotated in the same direction as the traveling direction of the resin film.

  The first apparatus of the present invention for producing an endless belt from a resin film containing a conductive filler includes (a) a first ultrasonic horn having an annular groove on a flat upper surface and rotating, and the annular groove. A roll that engages and follows, a transport base that is movable in a tangential direction of the first ultrasonic horn, and the resin film that is bent in an annular shape, with both ends projecting laterally from the transport base. An ultrasonic welding fusing device comprising a pressing member fixed to a conveying table, and (b) an ultrasonic device comprising a contact table having a flat upper surface and a second ultrasonic horn, By driving the conveying table to which the resin film is fixed in a welding fusing device, the protruding portion of the resin film is passed between the annular groove of the rotating first ultrasonic horn and the driven roll, The resin film After the ultrasonic welding of the projecting portion of the film in a linear manner and fusing, the ultrasonic fusing portion of the resin film is fixed to the abutment base in the ultrasonic device, and the first fusing portion along the ultrasonic fusing portion is fixed. By moving the second ultrasonic horn while pressing it, the ultrasonic fusing part is flattened.

  In the first device, the annular groove has a V-shaped inclined surface, and the driven roll has an inclined roll surface, and a two-layer stack that enters between the annular groove and the driven roll. It is preferable that the resin film is pressed by the inclined roll surface of the driven roll and the V-shaped inclined surface of the annular groove and is melted in a welded state.

  A second method of the present invention for producing an endless belt from a resin film containing a conductive filler rotates a first ultrasonic horn having a flat upper surface and rolls it on the upper surface of the first ultrasonic horn. The resin film is ultrasonically welded and melted by passing the vicinity of both ends of the resin film bent in an annular shape between the upper surface of the first ultrasonic horn and the driven roll. The joined ultrasonic fusing part is opened and held on the flat surface of the contact table, and the ultrasonic fusing part is flattened by moving the second ultrasonic horn while pressing the second ultrasonic horn along the ultrasonic fusing part. It is characterized by that.

  A second apparatus of the present invention for producing an endless belt from a resin film containing a conductive filler includes: (a) a first ultrasonic horn having a flat upper surface and rotating; and the first ultrasonic horn. A roll that abuts on the upper surface and is driven, a transport base that is movable in a tangential direction of the first ultrasonic horn, and the resin film that is bent in an annular shape, with both ends projecting laterally from the transport base. An ultrasonic welding fusing device comprising a pressing member fixed to a conveying table, and (b) an ultrasonic device comprising a contact table having a flat upper surface and a second ultrasonic horn, By driving the transport table to which the resin film is fixed in a welding fusing device, the protruding portion of the resin film is passed between the upper surface of the rotating first ultrasonic horn and the driven roll, and the resin fill After the ultrasonic welding of the protruding portion of the resin film and fusing, the ultrasonic fusing portion of the resin film is fixed to the abutment base in the ultrasonic device, and the second portion along the ultrasonic fusing portion is fixed. By moving the ultrasonic horn while pressing the ultrasonic horn, the ultrasonic fusing part is flattened.

In the second method and apparatus, the driven roll has a V-shaped roll surface, and the inclination angle θ ₁ from the center line of the first roll surface portion on the resin film side of the roll surface is on the opposite side. It is preferable that the inclination angle θ ₂ from the center line of the second roll surface portion is larger.

  The first and second endless belt manufacturing apparatuses further include (c) a flat member, a pair of spring plates attached to both ends of the belt through hinges, and a member that prevents the resin film from rising. A resin film folding device, and (d) a hinge member having a pair of pressing plates, and both ends of the resin film bent in an annular shape by the resin film folding device are inserted between the pair of pressing plates of the hinge member. Thereafter, it is preferable that both ends of the resin film are accurately aligned and gripped by closing the pair of presser plates.

  A vertical flange portion having a flat surface is provided at the tip of the pressing plate of the hinge member, and after bringing the both ends of the resin film into contact with the vertical flange portion, It is preferable that the length of the protruding portion of the resin film is accurately determined by fixing the resin film to the transport table with the pressing member.

  The resin film is preferably made of a composition in which carbon black is dispersed in a matrix resin mainly composed of polyarylate.

  In the present invention, the first ultrasonic horn is rotated with respect to the stopped follower roll, and the carrier is advanced in a tangential direction with respect to the first ultrasonic horn. In addition, the linear ultrasonic welding fusing can be stably performed by adjusting the traveling speed of the conveyance table. Therefore, even a film made of a hard-to-mold resin such as polyarylate can be made into an endless belt neatly. By the method of the present invention, an endless belt can be obtained at low cost.

It is a schematic side view which shows the resin film bending apparatus used for the manufacturing apparatus of the endless belt of this invention. It is a schematic side view which shows the process of aligning the both ends of a resin film correctly and holding with a resin film bending apparatus and a hinge member. It is the elements on larger scale which show the hinge member which hold | gripped the both ends of the resin film. It is a top view which shows the ultrasonic welding fusing apparatus used for the manufacturing apparatus of the endless belt of this invention. It is a longitudinal section showing an ultrasonic welding fusing device. It is an expanded sectional view showing the relation between the V-shaped slope of the annular groove of the first ultrasonic horn and the inclined roll surface of the driven roll. It is sectional drawing which shows the process of positioning and fixing the resin film which hold | gripped both ends with the hinge member to a conveyance stand. It is a top view which shows the ultrasonic welding fusing apparatus when the conveyance stand which fixed the film exists in a standby position. It is a perspective view which shows the process of feeding a resin film between the rotating 1st ultrasonic horn and the stationary driven roll. It is a perspective view which shows the process of ultrasonically welding a resin film with the rotating 1st ultrasonic horn and the stationary follower roll. It is a partial expanded sectional view which shows the process of ultrasonically welding a resin film with the driven roll engaged with the annular groove of a 1st ultrasonic horn. It is the elements on larger scale which show the ultrasonic welding fusing part of a resin film. It is a top view which shows the state in the middle of the ultrasonic welding fusing of the resin film. FIG. 5 is a cross-sectional view in the transverse direction showing the positional relationship between the carrier and the first ultrasonic horn during ultrasonic welding fusing of the resin film. It is a top view which shows the process of taking out the resin film which ultrasonic welding fusing was completed from the ultrasonic welding fusing apparatus. It is sectional drawing which shows the process of planarizing the ultrasonic welding fusing part of a resin film with a 2nd ultrasonic horn. It is a partial expanded sectional view which shows the example of the driven roll and 1st ultrasonic horn used for a 2nd method and apparatus. It is a top view which shows the ultrasonic welding fusing apparatus used for the manufacturing apparatus of a 2nd endless belt.

  An endless belt manufacturing method and apparatus according to the present invention will be described in the order of steps with reference to the accompanying drawings.

[1] First endless belt manufacturing method and apparatus
(A) Resin Film Bending Device and Hinge Member FIG. 1 shows an example of a resin film bending device 10. As shown in (1) of FIG. 1, the bending apparatus 10 is configured to raise a flat member 11, a pair of spring plates 12a and 12b attached to both ends of the flat member 11 via hinges 11a and 11b, and a resin film F. And a bar member 13 for blocking. First, the resin film F is placed with the pair of spring plates 12a and 12b opened, and the bar member 13 is disposed above the resin film F. As shown in FIG. 1 (2), when the pair of spring plates 12a and 12b are rotated upward in this state, the resin film F, which is prevented from rising by the bar member 13, becomes the flat member 11 and the pair of spring plates 12a. , 12b. The bent resin film F becomes curved due to elasticity.

  At this time, both ends Fa and Fb of the resin film F are usually not accurately aligned. As shown in (1) and (2) of FIG. 2, both ends Fa and Fb of the resin film F are inserted between a pair of presser plates 15a and 15b of the hinge member 15 which is expanded, and a pair of presser plates 15a and 15b are inserted. The hinge member 15 is slightly lowered with the 15b open. When descending, the hinge member 15 may be vibrated. For example, if the end portion Fa of the resin film F is located above the end portion Fb, only the end portion Fa contacts the inner end surface 15c of the hinge member 15, so that only the end portion Fa is pushed downward. Then, the resin film F slides on the surfaces of the flat member 11 and the spring plates 12a and 12b, and both ends Fa and Fb become the same height. In order to improve the sliding of the resin film F, it is preferable to provide a low friction layer such as Teflon (registered trademark) on the upper surface of the flat member 11 and the spring plates 12a and 12b and the inner surfaces of the pair of pressing plates 15a and 15b. . In order to accurately align both ends Fa and Fb, the hinge member 15 is sufficiently lowered. As shown in (3) of FIG. 2, when both ends Fa and Fb are accurately aligned, the pair of pressing plates 15a and 15b are completely closed, and both ends Fa and Fb of the resin film F are firmly fixed.

  As shown in FIGS. 3 and 6, since the hinge member 15 is brought into contact with the vertical surface 26a of the transport table 26 when the resin film F is fixed to the transport table, each presser plate 15a, 15b has a vertical flange portion 16a. 16b are provided. The flange portions 16a and 16b are perpendicular to the press plates 15a and 15b, and have a flat surface that comes into contact with the vertical surface 26a of the transport table 26. The carriage 26 has a step portion 26b having a horizontal and flat upper surface 26c for placing and sliding the vertical flange portions 16a and 16b. The distance between the flat upper surface 26c of the stepped portion 26b and the upper surface 26d of the transport table 26 is equal to the length of the vertical flange portions 16a and 16b. For this reason, the holding plates 15a and 15b that are in contact with the vertical surface 26a of the transport table 26 have the same height as the upper surface 26d of the transport table 26.

(B) Ultrasonic welding fusing device As shown in FIGS. 4 and 5, the ultrasonic welding fusing device 20 includes a first ultrasonic horn 21 having an annular groove 22 on a flat upper surface 21 a, and an annular groove 22. The roll 24 that is engaged with and driven by the roller, the transport base 26 that is movable in the tangential direction of the ultrasonic horn 21, and the resin film F that is bent in an annular shape with both ends Fa and Fb aligned, and both ends Fa and Fb are transport base 26. And a pressing member 28 fixed to the transport table 26 so as to protrude in the lateral direction. The first ultrasonic horn 21 is rotatable, but the rotation direction is preferably the same as that of the transport table 26.

  As shown in FIG. 6, the annular groove 22 has a V-shaped cross section, and the roll surface 24a of the roll 24 is inclined. Since the inclination angle from the center line of the inclined surface 22a of the annular groove 22 is larger than the inclination angle from the center line of the roll surface 24a of the roll 24, the upper end of the inclined surface 22a of the annular groove 22 (the edge of the annular groove 22) The roll surface 24a of the roll 24 is made to hit.

  In the example shown in FIG. 5, a guide bar 27 is slidably penetrating through the transport table 26, and the guide bar 27 is fixed to support frames 29a and 29b. The carriage 26 is also moved on the guide plate 32 by wheels (not shown). A driving belt 31 is attached to the transport table 26, and the driving belt 31 is driven by a pair of gears 32a and 32b (one is driven and the other is driven). The pressing member 28 has a U-shaped cross section and includes a flat lower surface 28a and a pair of vertical flange portions 28b.

  As shown in (1) and (2) of FIG. 7, the hinge member 15 holding the resin film F bent in an annular shape is leveled until the vertical flange portion 16b hits the upper surface 26c of the step portion 26b of the transport table 26. Then, the hinge member 15 is lowered. Next, when the hinge member 15 is moved horizontally in the direction of the transport table 26, the flat surface of the vertical flange portion 16b of one presser plate 15b comes into contact with the vertical surface 26a of the transport table 26. Then, the length of the resin film portion (protruding portion) F ′ protruding in the lateral direction from the transport table 26 is accurately defined. As shown in (3) and (4), the pressing member 28 is lowered and the resin film F is firmly held by the upper surface 26d of the transport base 26 and the lower surface 28a of the pressing member 28. As shown in FIG. 5, the pressing member 28 is firmly fixed to the transport table 26 by a pair of clamps 34a and 34b.

  FIG. 8 shows the state in which the resin film F is fixed to the transport table 26 from above. In FIG. 8, the transport table 26 is in the standby position, and the tip of the protruding portion F ′ of the resin film F is sufficiently in front of the driven roll 24. As shown in FIG. 9, the protrusion F ′ of the resin film F is brought closer to the first ultrasonic horn 21 by the advance of the conveyance table 26, and the first ultrasonic horn 21 is rotated in the same direction as the conveyance table 26. Let As shown in (1) and (2) of FIG. 10, when the protrusion F ′ of the resin film F enters between the annular groove 22 of the first ultrasonic horn 21 and the driven roll 24, the protrusion F 'Is pressed by the inclined surface 22a of the annular groove 22 and the roll surface 24a of the roll 24, and is melted in a welded state. FIG. 11 shows that the two resin films F are ultrasonically welded and blown out by the protruding portion F ′ of the resin film F pressed strongly by the inclined surface 22a of the annular groove 22 and the roll surface 24a of the roll 24. The situation is shown in detail. FIG. 12 (1) shows in detail the ultrasonic fusing part F ″ of the resin film F, and (2) shows the state of opening it. In this way, the ultrasonic fusing part F ″ is flat. Absent.

  FIG. 13 shows a state in the middle of ultrasonic welding fusing of the resin film F. The first ultrasonic horn 21 rotates with respect to the stopped follower roll 24, and the transport base 26 advances in the tangential direction with respect to the first ultrasonic horn 21, so that the rotation of the first ultrasonic horn 21 By adjusting the speed and the traveling speed of the transfer table 26, linear ultrasonic welding fusing can be stably performed. FIG. 14 shows the positional relationship between the carriage 26 and the first ultrasonic horn 21 during ultrasonic welding fusing. When the ultrasonic welding fusing is completed as shown in FIG. 15, the clamps 34a and 34b are opened, the pressing member 28 is removed, the resin film F welded in the form of an endless belt is taken out of the apparatus, and the transport base 26 is brought to the standby position. return.

(C) Ultrasonic device As shown in (1) of FIG. 16, the ultrasonic device 40 for flattening the ultrasonic fusing part F ″ of the endless belt-shaped resin film F includes an abutment base 41 having a flat upper surface 41a. And a second ultrasonic horn 42 movable along the ultrasonic fusing part F ″. The abutment base 41 is preferably a circular bar fixed to the support frame 43 in a cantilevered manner, and has a flat surface 41a formed on the upper part by processing.

  As shown in (2) of FIG. 16, the endless belt-shaped resin film F is fitted to the contact table 41, and the ultrasonic fusing part F ″ is fixed to the flat surface 41a. In this state, the second ultrasonic horn 42 Is pressed against the ultrasonic fusing part F ″ and moved along it. Then, the ultrasonic fusing part F ″ that is bent as shown in FIG. 12 is flattened. The linear movement of the second ultrasonic horn 42 may be performed once, or may be performed a plurality of times as necessary. .

[2] Second endless belt manufacturing method and apparatus The second method and apparatus is such that the upper surface of the first ultrasonic horn is flat (the upper surface of the first ultrasonic horn has no annular groove). Thus, it is different from the first method and apparatus. FIG. 17 shows an example of a driven roll. In the example of (1), the driven roll 25 has a V-shaped roll surface, and the inclination angle θ ₁ from the center line of the first roll surface portion 125a on the resin film F side is the second roll surface portion on the opposite side. It is equal to the inclination angle θ ₂ from the center line of 125b (for example, θ ₁ = θ ₂ = 45 °). In the example of (2), the inclination angle θ ₁ is larger than the inclination angle θ ₂ (for example, θ ₁ = 45 °, θ ₂ = 30 °). In the example of (3), the first roll surface portion 125a is curved and the second roll surface portion 125b is vertical. When the inclination angle θ ₁ from the center line of the first roll surface portion 125a is larger than the inclination angle θ ₂ from the center line of the second roll surface portion 125b as in the cases of (2) and (3), the resin film F When welding and cutting, the welded portion can be widened and the welding strength of the resin film F can be improved.
[3] Resin film composition
(A) Polyarylate The resin forming the resin film F used in the present invention is preferably composed mainly of polyarylate in order to satisfy the requirements as an endless transfer belt. “Mainly comprising polyarylate” means that the polyarylate may be 50% by mass or more of the resin content, and may be a resin of 100% polyarylate.

  Polyarylate is a polyester composed of a divalent phenol residue and a divalent aromatic carboxylic acid residue. Divalent phenol components include, for example, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 1,1-bis (4-hydroxyphenyl) cyclohexane (bisphenol Z), 2,2-bis (3 -Methyl-4-hydroxyphenyl) propane (bisphenol C), 1,1-bis (4-hydroxyphenyl) -1-phenylethane (bisphenol AP) and the like. Divalent aromatic dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 3-tert-butylisophthalic acid, diphenic acid, 4,4'-dicarboxylic acid, and the like. Polyarylate can be produced, for example, by the interfacial polymerization method described in JP-A-2008-19312.

(B) Other resin The composition used for this invention may contain other resin, such as polyester, as needed. Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, and polynaphthalene terephthalate, and polyethylene terephthalate is preferable. The blending amount of the other resin is preferably less than 50% by mass with 100% by mass of (polyarylate + other resin), and more preferably 30% by mass or less.

(C) Carbon black The carbon black added to the composition is acetylene black, ketjen black, furnace black, channel black or the like. The blending amount of carbon black is determined according to the desired conductivity of the transfer belt.

  As described above, the cushion member of the present invention has been described with reference to the drawings. However, the present invention is not limited thereto, and various modifications can be made without changing the gist thereof.

10 ... Resin film folding device
11 ... Flat member
11a, 11b ・ ・ ・ Hinges
12a, 12b ... a pair of springboards
13 ... Resin film rise prevention member
15 ・ ・ ・ Hinge member
15a, 15b ... A pair of presser plates
15c ・ ・ ・ Inner end surface of hinge member
16a, 16b ・ ・ ・ Vertical flange
20 ... Ultrasonic welding fusing device
21 ... First ultrasonic horn
21a: Upper surface of the first ultrasonic horn
22 ... Annular groove
22a ・ ・ ・ V-shaped slope of annular groove
24, 25 ... Follower roll
24a: Inclined roll surface of driven roll
125a, 125b ... first and second roll surface portions of the driven roll
26 ... Transport table
26a ・ ・ ・ Vertical surface of the carriage
26b ... Conveyor step
26c ・ ・ ・ Top surface of step
26d: Top surface of transfer table
27 ・ ・ ・ Guide bar
28 ... Pressing member
29a, 29b, 43 ... Support frame
30 ... Pressing plate
31 ... Drive belt
32a, 32b ... gear
34a, 34b ・ ・ ・ Clamp
40 ... Ultrasonic device
41 ・ ・ ・ Abutment stand
41a ... Upper surface of abutment base
42 ・ ・ ・ Second ultrasonic horn
F ... Resin film
Fa, Fb: Both ends of the resin film
F '... Projection of resin film
F "... Ultrasonic welding cut of resin film

Claims (14)

A method for producing an endless belt from a resin film containing a conductive filler, wherein a first ultrasonic horn having an annular groove on a flat upper surface is rotated, and a roll is engaged with the annular groove. The resin film is ultrasonically welded and blown by passing the vicinity of both ends of the resin film that is driven and bent into an annular shape between the annular groove and the driven roll, and the bonded ultrasonic fusing part is opened. A method of flattening the ultrasonic fusing part by holding it on a flat surface of an abutment base and moving the second ultrasonic horn along the ultrasonic fusing part while pressing. 2. The method of manufacturing an endless belt according to claim 1, wherein the annular groove has a V-shaped inclined surface, the driven roll has an inclined roll surface, and the annular groove and the driven roll are disposed between the annular groove and the driven roll. The method is characterized in that the two-layered resin film that has entered the space is pressed by the inclined roll surface of the driven roll and the V-shaped inclined surface of the annular groove, and is welded and fused. 3. The method of manufacturing an endless belt according to claim 1, wherein the first ultrasonic horn is rotated in the same direction as a traveling direction of the resin film. A method for producing an endless belt from a resin film containing a conductive filler, wherein a first ultrasonic horn having a flat upper surface is rotated, and a roll is brought into contact with the upper surface of the first ultrasonic horn. The resin film is ultrasonically welded and melted by passing the vicinity of both ends of the resin film bent and annularly between the upper surface of the first ultrasonic horn and the driven roll. The ultrasonic fusing part is opened and held on the flat surface of the abutment base, and the ultrasonic fusing part is flattened by moving the second ultrasonic horn while pressing the second ultrasonic horn along the ultrasonic fusing part. And how to. 4. The endless belt manufacturing method according to claim 3, wherein the driven roll has a V-shaped roll surface, and an inclination angle θ from a center line of the first roll surface portion on the resin film side of the roll surface. _{A method in which 1} is larger than an inclination angle θ ₂ from the center line of the second roll surface portion on the opposite side. 6. The method of producing an endless belt according to claim 1, wherein the resin film is made of a composition in which carbon black is dispersed in a matrix resin mainly composed of polyarylate. An apparatus for producing an endless belt from a resin film containing a conductive filler, comprising: (a) a first ultrasonic horn having an annular groove on a flat upper surface and rotating, and engaging with the annular groove. The follower roll, the transport base movable in the tangential direction of the first ultrasonic horn, and the resin film bent in an annular shape are fixed to the transport base so that both ends protrude in the lateral direction from the transport base. An ultrasonic welding fusing device comprising a pressing member, and (b) an ultrasonic device comprising a contact table having a flat upper surface and a second ultrasonic horn, in the ultrasonic welding fusing device. By driving the transport table to which the resin film is fixed, the protruding portion of the resin film is passed between the annular groove of the rotating first ultrasonic horn and the driven roll, and thus the resin film. Clash After ultrasonic welding the part to a line and fusing, in the ultrasonic device, the ultrasonic fusing part of the resin film is fixed to the abutment base, and the second supersonic part is taken along the ultrasonic fusing part. An apparatus characterized in that the ultrasonic fusing part is flattened by moving while pressing a sonic horn. The endless belt manufacturing apparatus according to claim 7, wherein the annular groove has a V-shaped inclined surface, the driven roll has an inclined roll surface, and the annular groove and the driven roll are disposed between the annular groove and the driven roll. The two-layered resin film that has entered the space is pressed by the inclined roll surface of the driven roll and the V-shaped inclined surface of the annular groove, and is melted in a welded state. . An apparatus for producing an endless transfer belt from a resin film containing a conductive filler, comprising: (a) a first ultrasonic horn having a flat upper surface and rotating, and an upper surface of the first ultrasonic horn. A roll that is in contact with and driven, a transport base that is movable in the tangential direction of the first ultrasonic horn, and the resin film that is bent in an annular shape are placed on the transport base so that both ends protrude in the lateral direction from the transport base. An ultrasonic welding fusing device comprising a pressing member to be fixed; and (b) an ultrasonic device comprising a contact table having a flat upper surface and a second ultrasonic horn, the ultrasonic welding fusing device. In this case, the resin film is fixed by driving the conveying table to pass the protruding portion of the resin film between the upper surface of the rotating first ultrasonic horn and the driven roll. After the protruding portion is ultrasonically welded and fused, the ultrasonic fusing portion of the resin film is fixed to the abutment base in the ultrasonic device, and the second portion along the ultrasonic fusing portion is fixed. An apparatus characterized in that the ultrasonic fusing part is flattened by moving the ultrasonic horn while pressing it. The endless belt manufacturing apparatus according to claim 9, wherein the driven roll has a V-shaped roll surface, and an inclination angle from a center line of the first roll surface on the resin film side of the roll surface is set. An apparatus having an inclination angle larger than a center line of the second roll surface on the opposite side. The apparatus for producing an endless belt according to any one of claims 7 to 10, wherein the first ultrasonic horn rotates in the same direction as a traveling direction of the resin film. 12. The endless belt manufacturing apparatus according to claim 7, further comprising: (c) a flat member, a pair of spring plates attached to both ends of the endless belt via hinges, and preventing the resin film from rising. A resin film folding device comprising a member; and After inserting between the press plates, the pair of press plates are closed to hold both ends of the resin film accurately. The endless belt manufacturing apparatus according to any one of claims 7 to 12, wherein a vertical flange portion having a flat surface is provided at a tip of a holding plate of the hinge member, and the both ends of the resin film are gripped. After the vertical flange portion is brought into contact with the vertical surface of the transport table, the length of the protruding portion of the resin film is accurately determined by fixing the resin film to the transport table by the pressing member. Equipment. The apparatus for producing an endless belt according to any one of claims 7 to 13, wherein the resin film is made of a composition in which carbon black is dispersed in a matrix resin mainly composed of polyarylate.

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