Abstract: There is provided an apparatus for forming a magnetic pigment pattern on an article. The apparatus includes: a magnetic pattern mold having nonmagnetic pattern grooves engraved in a predetermined pattern and providing predetermined magnetic field lines on a pattern-forming object surface of an article by generating magnetism in areas outside the nonmagnetic pattern grooves; and a spray unit spraying an adhesive resin composite containing a ferromagnetic pigment onto the pattern-forming object surface of the article. A predetermined magnetic pigment pattern is formed while the magnetic pigment of the adhesive resin composite that is applied to the pattern-forming object surface of the article is rearranged along magnetic field lines generated by the magnetic pattern mold.

Abstract: A bonded magnet is provided which includes first and second components. The first and second components have first and second non-action surfaces, and first and second action surfaces that intersect the first and second non-action surfaces, respectively. First and second flux groups curve inside the first and second components from the first and second non-action surfaces to the first and second action surfaces, respectively. The areas of the first and second non-action surfaces are greater than the first and second action surfaces, respectively. The flux densities on the first and second action surfaces are higher than the first and second non-action surfaces, respectively. The pole on the first non-action surface is opposite to the second non-action surface. The first and second non-action surfaces are coupled to each other. The first flux groups continuously extend from one to another.

Abstract: Reduction of crosstalk between induction heating coils in an induction heating apparatus and particularly to reduction of crosstalk in a multi-zone induction heating system provides greater reliability for the power modules.

Abstract: A method of manufacturing a roll for roll printing/roll imprinting is provided. The method includes preparing an exterior on one surface of which a printed pattern of a predetermined shape is formed and that has magnetic power and having the other surface of the exterior contact an external surface of a central roll so that the exterior is attached to the central roll having magnetic power by magnetic power. Therefore, the method of manufacturing a roll for roll printing/roll imprinting capable of reducing production cost to massively manufacture the roll for roll printing/roll imprinting is provided.

Abstract: A roller comprising a magnet is used to apply a force to a material between the magnet of the roller and a magnetically susceptible surface. A handle of the roller may be moved by a user to roll the roller over the material to apply the force along a length of the material.

Abstract: There is described a cylinder body (10) for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate, which cylinder body (10) has a plurality of magnetic-field-generating devices (50, 60) disposed on an outer circumference of the cylinder body (10). The cylinder body (10) comprises a plurality of distinct annular supporting rings (40) distributed axially along a common shaft member (20), each annular supporting ring (40) carrying a set of magnetic-field-generating devices (50, 60) which are distributed circumferentially on an outer circumference of the annular supporting rings (40).

Abstract: A magnetic roller includes a solid-core roller having magnetic anisotropy in a direction orthogonal to a central axis thereof. The solid-core roller includes a body part, and shaft parts disposed on both ends of the body part, a concave groove provided in an outer circumference face of the body part to extend in an axial direction, and a magnetic block disposed in the concave groove, the magnetic block having a direction of magnetic anisotropy substantially orthogonal to a direction of the magnetic anisotropy of the magnetic roller.

Abstract: There is described a cylinder body (10) for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate, which cylinder body (10) has a plurality of magnetic-field-generating devices (50, 60) disposed on an outer circumference of the cylinder body (10). The cylinder body (10) comprises a plurality of distinct annular supporting rings (40) distributed axially along a common shaft member (20), each annular supporting ring (40) carrying a set of magnetic-field-generating devices (50, 60) which are distributed circumferentially on an outer circumference of the annular supporting rings (40).

Abstract: A rotating machine comprising a sintered ferrite magnet having an M-type ferrite structure, comprising Ca, an R element that is at least one of rare earth elements and indispensably includes La, Ba, Fe and Co as indispensable elements, and having a composition represented by the formula: Ca1-x-yRxBayFe2n-zCoz, wherein (1?x?y), x, y, z and n represent the contents of Ca, the R element, Ba and Co, and a molar ratio, meeting 0.3?1?x?y?0.65, 0.2?x?0.65, 0.001?y?0.2, 0.03?z?0.65, 4?n?7, and 1?x?y>y; a bonded magnet comprising ferrite powder having the above composition and a binder, and a magnet roll, at least one magnetic pole portion of which is made of the above bonded magnet.

Abstract: A printing apparatus includes a magnetic rotatable roller with a smooth even outer surface for aligning magnetic flakes in a carrier, such as an ink vehicle or a paint vehicle to create optically variable images in a high-speed, linear printing operation. Images can provide security features on high-value documents, such as bank notes. Magnetic flakes in the ink are aligned using magnetic portions of the roller, that can be formed by permanent magnets embedded in a non-magnetic roller body, or selectively magnetized portions of a flexible magnetic cover of the roller. In some embodiments, the roller is assembled for a plurality of interchangeable sections, which can include spinning magnets. Selected orientation of the magnetic pigment flakes can achieve a variety of illusive optical effects that are useful for decorative or security applications.

Abstract: A deflection compensating roller including a rotating roller casing, a rotationally fixed yoke axially extending through the roller casing, at least one hydrostatic support device arranged between the yoke and the roller casing, the at least one hydrostatic support device comprising a pressure compartment and at least one oil pocket that communicates with the pressure compartment via at least one first restricted flow zone and at least one second restricted flow zone, and a fluid comprising at least one of an electrorheological fluid (ERF) and a ferro fluid. A viscosity of the fluid is adapted to be varied by way of one of an electric and magnetic field. This abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Abstract: The present invention relates to a device for the torque limitation in a machine for processing means of payment. The invention has use as a device for limiting torque in a machine for processing means of payment, wherein the device for the torque limitation includes two elements transmitting a torque, the two elements having magnets which are disposed in the two elements with an angular distribution of the same kind, the magnets connecting the two elements to each other in a non-positive fashion, and the connection of the two elements being disrupted when a maximum transmittable torque is exceeded.

Abstract: A suction roller for transporting flat material blanks has a roller axis and a mantle surface. The suction roller is independent of format and therefore can be universally used for transporting flat material blanks, particularly label blanks. The suction roller has controllable suction holes or suction zones that lie at the closest possible distance from one another on its mantle surface. To this end, the suction roller has a plurality of suction slits, which run parallel to the roller axis and open into the mantle surface, whereby at least adjacent suction slits can have suction air applied to them independent of one another, and whereby a slit cover provided with passage holes is disposed on the mantle surface, in such a manner that the passage holes align with the suction slits, at least in part.

Abstract: A printing apparatus includes a magnetic rotatable roller with a smooth even outer surface for aligning magnetic flakes in a carrier, such as an ink vehicle or a paint vehicle to create optically variable images in a high-speed, linear printing operation. Images can provide security features on high-value documents, such as bank notes. Magnetic flakes in the ink are aligned using magnetic portions of the roller, that can be formed by permanent magnets embedded in a non-magnetic roller body, or selectively magnetized portions of a flexible magnetic cover of the roller. In some embodiments, the roller is assembled for a plurality of interchangeable sections, which can include spinning magnets. Selected orientation of the magnetic pigment flakes can achieve a variety of illusive optical effects that are useful for decorative or security applications.

Abstract: A magnetic field generating member with high stiffness and small size, an image development device, a process cartridge and an image forming apparatus including the magnetic field generating member as well as a manufacturing method of the magnetic field generating member are provided where the magnetic field generating member includes a main body, a groove provided in the main body, an interposition member configured to be fitted in the groove of the main body and including a concave portion and a magnetic member as a long magnetic compact fixed into the concave portion of the interposition member.

Abstract: A method of manufacturing a hollow body having an external surface randomly provided with a large number of depressions is provided. The method includes providing the large number of depressions on the external surface of the hollow body. A profile curve of the external surface in a circumferential direction is obtained while rotating the hollow body. A frequency analysis is performed on the obtained profile curve. A quality of the hollow body is judged by comparing a result of the frequency analysis with a predetermined judgment standard.

Abstract: The present invention provides a method for creating uniform pressure at a nip comprising the acts of providing a stationary inner core, pivotally mounting a plurality of shoes to the stationary inner core, creating a plurality of annular chambers wherein each of the shoes occupies one of the chambers. In addition, the method further provides filling each of the chambers with a magneto-rheological fluid, surrounding the plurality of chambers, shoes, and stationary inner core with a thin, metal, rotatable shell; detecting a deformation in the shell and changing a magnetic field in at least one of the chambers to change a viscosity of the magneto-rheological fluid to correct the deformation.

Abstract: Belt and tread drum (1), particularly for shaping a belt layer and/or tread layer or another tire component provided with metal parts into a circumferential whole, comprising one or more support members (4) arranged at the circumference of the drum, which are provided with a support surface for the tire component, wherein the support members comprise magnet sets having magnets (7a, 7b) for by magnetically attracting the metal parts retaining the tire component on the support surface, wherein the magnet sets comprise holders (8a, 8b) for the magnets and are placed from the radial inside in the support members, wherein the drum at the circumferential side comprises first portions that engage over the holders in tangential and/or axial direction of the drum, wherein the drum at the circumferential side comprises second portions that engage over the magnets in tangential and/or axial direction of the drum.

Abstract: The present invention provides an improved structure of a magnetic roller. The magnetic roller has a pull rope brake set, mainly including left and right drive gears, both of which are assembled onto the main disk nearby the swinging end of the left and right swinging magnetic disks. The left and right drive gears are engaged through the gear tooth. The pull rope's coupling portions are assembled onto left and right drive gears corresponding separately to swinging end of left and right swinging magnetic disks. The pull rope includes first and second pull ropes, the first pull rope being used to link the pull rope's coupling portion of the left drive gear and the swinging end of right swinging magnetic disk, while the second pull rope is used to link pull rope's coupling portion of right drive gear and the swinging end of left swinging magnetic disk.

Abstract: A magnet roller for use with a hollow cylindrical structure made of a non-magnetic material includes a roller body and a reinforcing member. The roller body, encased in the hollow cylindrical structure, has at least one magnetic pole to form an agent releasing area on a skin of the cylindrical structure. The roller body is integrated with a shaft on each end portion of the roller body as one solid body. The reinforcing member is embedded in a portion of the roller body corresponding to the agent releasing area. The reinforcing member is made of a material different from a material used for the roller body and extends in an axial direction of the roller body.

Abstract: A suction roller for transporting flat material blanks has a roller axis and a mantle surface. The suction roller is independent of format and therefore can be universally used for transporting flat material blanks, particularly label blanks. The suction roller has controllable suction holes or suction zones that lie at the closest possible distance from one another on its mantle surface. To this end, the suction roller has a plurality of suction slits, which run parallel to the roller axis and open into the mantle surface, whereby at least adjacent suction slits can have suction air applied to them independent of one another, and whereby a slit cover provided with passage holes is disposed on the mantle surface, in such a manner that the passage holes align with the suction slits, at least in part.

Abstract: A compliant pressure roller (10) for creating uniform pressure at a nip (42) has a stationary inner core (12). A plurality of shoes (14) is pivotally mounted to the stationary inner core. Non-magnetic dividers (16) create a plurality of annular chambers (18) and one shoe occupies one of the chambers. A magneto-rheological fluid fills each of the chambers and a plurality of magnetic field generators (13) changes a magnetic field in each of the chambers. A thin, rotatable shell (24) surrounds the plurality of chambers, shoes, and stationary inner core.

Abstract: An assembling method that is for a developing roller usable with a developing device. The developing roller includes a developer carrying member in the form of a hollow cylinder, a flange member provided at an end of the developer carrying member, and a magnet provided in the developer carrying member. The method includes an inserting step of inserting the magnet having at least one projection into an inside of the developer carrying member through an opening of the developer carrying member; an abutting step of abutting the at least one projection to an inside surface of the cylinder of the developer carrying member; and an engaging step of engaging the flange member with the opening by penetrating the flange member with a shaft of the magnet projected out of the opening.

Abstract: A heating roller includes a magnetic flux generation mechanism provided in a plurality of layers coaxially around the axis of a roller in the roller capable of being supported rotatably, and a control device capable of independently controlling the layers of the magnetic flux generation mechanism.

Abstract: A roll for guiding at least one yarn in a yarn processing operation and comprising a tubular roll sleeve which is mounted for free rotation on a support by a plurality of bearings. At least one of the bearings is constructed as a radially operative magnetic bearing, which comprises a plurality of bearing pole windings distributed in the circumferential direction of the roll sleeve and which have predetermined pole cross sections. At least one of the bearing pole windings has a pole cross section which is larger or smaller than the pole cross sections of one or more of the other bearing pole windings, so as to permit the load profile imparted to the sleeve by a running yarn to be balanced over the circumference of the sleeve.

Abstract: An assembling method for a developing roller usable with a developing device, the developing roller including a developer carrying member in the form of a hollow cylinder, a flange member provided at an end of the developer carrying member, and a magnet provided in the developer carrying member, the method including an inserting step of inserting the magnet having at least one projection into an inside through an opening of the developer carrying member; an abutting step of abutting the at least one projection to an inside surface of the cylinder; and an engaging step of engaging the flange member with the opening by penetrating the flange member through a shaft of the magnet projected out of the opening.

Abstract: An image forming apparatus of the present invention includes a developing device of the type causing a developer to form a magnet brush on the surface of a developer carrier having a magnet roller in a developing region or nip for development. The magnet brush contacts and thereby develops a latent image formed on an image carrier. The magnet roller has a main magnetic pole for development wherein the flux density in the tangential direction has a maximum variation ratio of 40 T/m or above in absolute value. The apparatus of the present invention increases image density and faithfully reproduces even low-contrast images with a low-cost configuration. Further, the apparatus reduces image defects, including granularity and the omission of the trailing edge of an image, even if the range over which the magnet brush and image carrier contact is reduced.

Abstract: A magnetic roll assembly including an roll core made of a first material and having a longitudinal axis; plural locating members formed of the first material on the outside surface for locating strip magnets; and plural strip magnets located on the plural locating members on the outside surface, the plural strip magnets each having at least first and second surfaces, and a mating feature on one of the at least first and second surfaces mirroring one of the plural locating members for locating and attaching each the plural strip magnets to the roll core, thereby resulting in a magnetic roll assembly that is easily and correctly assembled, and that facilitates rework and remanufacturing.

Abstract: A method and apparatus for obtaining a desired nip pressure distribution profile in the cross direction of a paper web. The paper web passes through a nip, the latter defined by at least one elastomer covered roll, the covered roll having polarizable particles or magnetic particles embedded therein. A plurality of spaced plates or spaced coils each generate a local field (respectively electric or magnetic) which acts upon individual spaced zones or regions along the covered roll. The field may thus be an electric field or a magnetic filed. The effect of the field is to change the effective modulus of the elastomer by acting on the particles. In turn, this action varies the nip pressure pulse as to exert a desired pressure at each of a plurality of spaced zones or regions on the paper web, to thus create or process a more uniform product in the nip. The method and apparatus can be used, for example, to improve web moisture profiles in the press section of paper machines.

Abstract: Cigarette sticks are carried through a filter tip attachment on a train of rollers, each comprising a fixed first tubular body rigidly associated with a vertical bulkhead and a rotatable second-tubular body placed coaxially over the fixed tubular body and centered on an axis common to both bodies. Each roller incorporates a stator rigidly associated with the first tubular body and a rotor rigidly associated with the second tubular body, coinciding respectively with the primary and the secondary of an electric motor of which the winding is connected to a power source governed by a master controller; the controller receives signals from individual transducers capable at any given moment of sensing the angular position and velocity of the single rollers, in such a way as to select a predetermined timing for each roller relative to the others of the train, which is maintained throughout each operating cycle.

Abstract: A roll that can be bent for a web-like material, which roll comprises a continuous tubular roll mantle (11) of composite material as well as axle journals (12) connected to each end of the roll mantle (11). The axle journals (12) are attached by means of at least one mechanism (30), by whose means the axle journals (12) and thereby the roll mantle (11) are bent into an arc form, and a regulation device (40) by whose means the angular position of the roll arc can be regulated.

Abstract: A magnet roller comprises a magnet body integrally molded out of a resin magnet composition prepared by mixing and dispersing magnetic powders in a resin binder and a shaft portion projecting from both ends or one end in an axial direction of the magnet body and has a magnetization pattern with a zero-gauss zone between a pair of magnetic poles having the same polarity which are adjacent to each other in a circumferential direction, wherein a cut-out portion extending in an axial direction is formed on the side of the magnetic body at the predetermined position of the zero-gauss zone.

Abstract: A magnetic cylinder for holding printing plates, embossing plates, die-cutting plates or the like has a plurality of pockets or recesses formed on its outer surface, each of the pockets or recesses containing magnetic elements of permanent bar magnets and interposed pole pieces with the pockets offset circumferentially from one another so that the magnetic holding field will armature with the plate placed on the cylinder at least in part over the entire width and length or breadth of the plate to ensure that the entire plate including the leading and trailing edges are held securely in place while the cylinder rotates.

Abstract: A magnetic roll, such as for use in a xerographic printing apparatus, is formed from two semicylindrical partial cylinders. The partial cylinders can be molded and attached to each other to form a complete cylinder defining magnetic poles along the circumference thereof.

Abstract: A magnetic roll, such as for use in a xerographic printing apparatus, is formed from two semicylindrical partial cylinders. The partial cylinders can be molded and attached to each other to form a complete cylinder defining magnetic poles along the circumference thereof.

Abstract: There are disclosed a composition for resin magnets which comprises a thermoplastic resin and magnetic powders and which, when determined in a heated molten state, has specific viscosity characteristics characterized in that the almost linear line which is obtained by taking &eegr;R/&eegr;O as ordinate and &ggr; as abscissa has a slope of at most 0.02, preferably at most 0.01 within a specific temperature range in which &eegr;O falls within the range of from 2.0×106 to 1.0×107 dyne/cm2, wherein &eegr;R denotes shear stress (dyne/cm2), &eegr;O denotes yield stress (dyne/cm2) and &ggr; denotes shear rate (S−1); a magnetic member which is produced by the use of the above composition for resin magnets; and a process for efficiently producing the magnetic member from the composition by an extrusion molding in a magnetic field under specific temperature and pressure conditions.

Abstract: A magnetic cylinder for printing plates and the like has a core of low-cost magnetically permeable material with an outer shell of higher cost low magnetic permeability material with magnetic elements resting in cavities or channels formed in the shell.

Abstract: A ferrite powder for bonded magnets having a substantially magnetoplumbite-type crystal structure and an average diameter of 0.9-2 &mgr;m, the ferrite powder having a basic composition represented by the following general formula: (A1−xRx)O.n[(Fe1−yMy)2O3] by atomic ratio, wherein A is Sr and/or Ba; R is at least one of rare earth elements including Y, La being indispensable; M is at least one element selected from the group consisting of Co, Mn, Ni and Zn; and x, y and n are numbers meeting the conditions of 0.01≦x≦0.4, [x/(2.6n)]≦y≦[x/(1.6n)], and 5≦n≦6, (Si+Ca) being 0.2 weight % or less, and (Al+Cr) being 0.13 weight % or less, can be produced by mixing iron oxide containing 0.06 weight % or less of (Si+Ca) and 0.

Abstract: A method for manufacturing a magnetic roll for use in an electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member is provided. The method includes the steps of placing a shaft in a mold cavity and molding a core in the mold cavity with the shaft in the cavity. The core defines a pocket on the periphery of the core. The method further includes the step of attaching a magnet to the pocket.

Abstract: A ferrite powder for bonded magnets having a substantially magnetoplumbite-type crystal structure and an average diameter of 0.9-2 &mgr;m, the ferrite powder having a basic composition represented by the following general formula: (A1-xRxO.n[Fe1-yMy)2O3] by atomic ratio, wherein A is Sr and/or Ba; R is at least one of rare earth elements including Y, La being indispensable; M is at least one element selected from the group consisting of Co, Mn, Ni and Zn; and x, y and n are numbers meeting the conditions of 0.01≦x≦0.4, [x/(2.6n)]≦y≦[x/(1.6n)], and 5≦n≦6, (Si+Ca) being 0.2 weight % or less, and (Al+Cr) being 0.13 weight % or less, can be produced by mixing iron oxide containing 0.06 weight % or less of (Si+Ca) and 0.

Abstract: A modified film transport roller for use with film handling systems to prevent the sticking and bunching of film due to build-ups of static electric charges on the surface of the film. The modified roller has a strip or layer of magnetized polymeric material applied to the hub between the end supports or collars, but of a thickness less than the height of the collars. The film rests on the collars as it passes over the roller and through the magnetic field, but does not come in contact with the magnetized layer. Static charges are polarized by the magnetic field. As a result of the polarization of the static charges, sections of film are not attracted to one another and the film does not stick or bunch as it moves to and from the projector.

Abstract: A bonded magnet featuring mechanical strength is obtained from a bonded magnet-forming composition comprising magnetic powder and a binder wherein the binder is based on highly crystalline polypropylene in one form or contains a modified polyolefin in another form. Also provided is a magnet roller comprising a magnet body (1) of bonded magnet configured into a roller shape and a shaft (2) associated therewith wherein at least the magnet body (1) is formed from the bonded magnet-forming composition.

Abstract: A cylinder assembly is provided for transferring foil onto a substrate. A cylinder assembly includes a generally cylindrical core having an outer surface. The outer surface of the core includes a plurality of magnet receiving depressions therein. Magnets formed from rare earth metals are secured within corresponding depressions in the outer surface of the core. A die plate is positioned about the outer surface of the core. A heating structure heats the outer surface of the die plate to a temperature less than 475.degree. F.

Abstract: A development system is which includes a developer roll with a magnetic sleeve. The sleeve has a static magnetic field pattern for transporting developer material to a development zone; and a magnetic system for generating a superimposed alternating magnetic field to agitate developer material in the development zone in order to produce a charged toner cloud intended for the non-interactive development of latent electrostatic images.

Abstract: A developing roller is made up of a magnet member and a sleeve surrounding the magnet member. A sophisticated magnetic characteristic including a repulsive pole can be easily formed on the surface of the sleeve. The repulsive pole causes a developer to be sharply released from the surface of the sleeve. A developing device including the developing roller is also disclosed.

Abstract: A method for manufacturing a magnetotherapeutic back massager. A roller blank having a central cylindrical core circumscribed by a pair of spaced apart circular projections receives magnets in the circular projections to provide magnetic properties to the resultingly constructed magnetotherapeutic back massager. Preferably, the magnets are arranged so as to alternate polarity and a magnet-supporting strip holds the magnets together prior to and during the association of the magnets with the circular projections. The circular projections may have indentations or grooves to accommodate the magnets. Once the magnets have been associated with the circular projections, the magnets are more permanently attached by applying additional material to the circular projections so as to seal the magnets to the circular projections. The sealing material may be the same as that used to construct the roller blank, preferably latex rubber.

Abstract: A multi-use die system is provided having a die holder with reference marks disposed circumferentially and radially along the longitudinal axis of the holder, and a multi-use die plate for magnetic affixation to the die holder which impresses a pattern onto a material blank. The die plate has straight and angular reference marks disposed thereon which are adapted to align with the radial and longitudinal reference marks on the die holder so as to properly align the die on the die holder at a predetermined position. In a straight rotary die system, the die is aligned such that the straight reference mark on the die is aligned with the respective corresponding radial and circumferential references on the die holder. In the angular rotary die system, the die is aligned such that the angular mark is aligned with the corresponding radial and circumferential references on the die holder.

Abstract: A magnetically driven apparatus useful, for instance, for conveying webs, utilizes magnetically coupled first and second rotatable elements and means for rotating one of the rotatable elements which causes the simultaneous synchronous rotation of the other rotatable element. Both first and second rotatable elements include a magnetic core, and a media bearing surface comprising a mixture of a polymeric matrix and a hard, inorganic particulate material wear and abrasion resistant layer surrounding the magnetic core. The means for rotating one of the rotatable elements includes a ferromagnetic stator member integrally associated with one of said first and second rotatable elements. The ferromagnetic stator member has a plurality of spatially separated pole teeth, wherein each of the pole teeth has an operably connected coil arranged for producing rotation of one of said first and second rotatable elements once the coil is energized.

Abstract: A magnet roller capable of adjusting the height and position of a magnetic force peak after formation of a roller, and easily meeting a requirement to attain a complex magnetic force pattern without significantly increasing the cost. In the magnet roller, at least two kinds of first magnet pieces and second magnet pieces different from each other in orientation characteristic of magnetic powders are fixedly disposed around the outer periphery of a shaft. The first magnet pieces is a magnet piece in which anisotropic magnetic powders are oriented in such a manner to converge from both the side surfaces and the back surface to a specific position on the front surface side.

Abstract: A sheet carrying apparatus capable of carrying sheets at a stable speed at which a transfer belt will not be waved or wrinkled and an image forming apparatus for providing high-quality images. In opposition to a drive roll for driving the transfer belt, an opposing member magnetically attracted to the drive roll is arranged.