JP4805640B2 - Surface treatment equipment - Google Patents

Description

  The present invention relates to a surface treatment apparatus that roughens the surface of a workpiece by causing magnetic abrasive grains to collide with the outer surface of the workpiece such as a developing sleeve of an image forming apparatus.

  For example, in order to roughen the outer surface of an object to be processed such as a developing sleeve of a developing roller that conveys developer adhered to the outer surface of the image forming apparatus to a photosensitive drum, the magnetic abrasive grains and the object to be processed are accommodated. Enclose in the tank, generate a rotating magnetic field that moves the magnetic abrasive grains, and randomly excite the magnetic abrasive grains by the electromagnetic force acting between the rotating magnetic field and the magnetic abrasive grains to collide with the workpiece Thus, a surface treatment apparatus (for example, see Patent Documents 1 to 4) for roughening the outer surface of the surface is known.

This type of surface treatment apparatus is known to have higher processing efficiency than a sand blasting apparatus or a shot blasting apparatus in which abrasive grains are ejected by air pressure or water pressure and the abrasive grains collide with a workpiece.
JP 2003-305634 A JP 2001-138207 A Japanese Patent No. 3486221 JP 61-38862 A

  For example, when the outer surface of the developing sleeve is formed to have a uniform surface roughness, the developer pumping amount at both ends in the longitudinal direction of the developing sleeve is smaller than the pumping amount of the developer at the central portion in the longitudinal direction. It is known to be. In this case, when a desired image is printed on the recording paper, of course, the edge image becomes lighter than the center portion. As described above, when the outer surface of the developing sleeve is formed to have a uniform roughness, the recording paper image may be uneven.

  The present invention has been made in view of the above background, and a surface on which an outer surface of an object to be processed formed on a developing sleeve can be roughened so as to prevent image unevenness from occurring. An object is to provide a processing apparatus.

The surface treatment apparatus according to claim 1, wherein a storage tank that stores a workpiece and magnetic abrasive grains, a rotating magnetic field that moves the magnetic abrasive grains in the storage tank is generated, and the magnetic field is generated by the rotating magnetic field. in the surface treatment apparatus provided with a magnetic field generating unit impinging abrasive to the workpiece, and a moving means for moving along the magnetic field generating unit in the longitudinal direction of the container tank, the housing of the magnetic field generating unit detecting means for detecting a relative position with respect to the vessel, and a magnetic field changing means for changing the intensity of the magnetic field the Ru generated by the magnetic field generating unit, relative to said storage tank of the magnetic field generating unit which is detected by said detecting means based on the position, it is characterized by comprising a control means for changing the strength of the magnetic field that will be generated by the magnetic field generating unit in the magnetic field changing means.

The surface treatment apparatus according to a second aspect is the surface treatment apparatus according to the first aspect, wherein the control means causes the magnetic field changing means to intensify the magnetic field generated by the magnetic field generation unit according to a predetermined pattern. It is characterized by being configured to change the height.

The surface treatment apparatus according to claim 3 is the surface treatment apparatus according to claim 2, wherein the control means rotates the magnetic field generation unit when both ends in the longitudinal direction of the object to be processed are processed. magnetic field, the longitudinal direction so as to be stronger than the rotational magnetic field generated in the magnetic field generating unit when processing the central part of the strength of the prior Symbol magnetic field generated by the magnetic field generating unit to the magnetic field varying means of said workpiece It is characterized by being made to change.

The surface treatment apparatus according to claim 4, wherein a storage tank that stores a workpiece and magnetic abrasive grains, a rotating magnetic field that moves the magnetic abrasive grains in the storage tank is generated, and the magnetic field is generated by the rotating magnetic field. In a surface treatment apparatus comprising a magnetic field generation unit for causing abrasive grains to collide with the object to be processed, moving means for moving the magnetic field generation unit along the longitudinal direction of the storage tank, and the storage tank of the magnetic field generation unit Based on the relative position of the magnetic field generation unit detected by the detection unit with respect to the storage tank, the speed of moving the magnetic field generation unit to the moving unit is changed based on the relative position of the magnetic field generation unit detected by the detection unit . It is characterized by comprising a control means for.

The surface treatment apparatus according to claim 5 is the surface treatment apparatus according to claim 4, wherein the control unit causes the moving unit to change a moving speed of the magnetic field generation unit according to a predetermined pattern. It is configured as described above.

The surface treatment apparatus according to claim 6 is the surface treatment apparatus according to claim 5, wherein the control means moves the magnetic field generation unit when the both end portions in the longitudinal direction of the workpiece are machined. but wherein such slower than moving speed of the magnetic field generating unit when processing the central portion in the longitudinal direction of the object, so as to change the moving speed of the magnetic field generating unit before Symbol moving means configured It is characterized by being.

The surface treatment apparatus according to claim 7 is the surface treatment apparatus according to any one of claims 1 to 6, wherein the space in the storage tank is partitioned along the longitudinal direction of the storage tank. It is characterized in that it comprises a means.

The surface treatment apparatus of claim 8, in the surface treatment apparatus as claimed in any one of claims 1 to 7, provided with holding means for holding the workpiece in the center of the storage tank It is characterized in that there.

  According to the surface treatment apparatus of claim 1, the control means determines the strength of the rotating magnetic field generated by the magnetic field generation unit based on the relative position of the magnetic field generation unit with respect to the storage tank, that is, the workpiece. As the rotating magnetic field becomes stronger, the movement of the magnetic abrasive grains becomes active, and the kinetic energy when the magnetic abrasive grains collide with the outer surface of the workpiece is increased. The surface roughness becomes rough.

  As a result, the surface roughness of the outer surface at an arbitrary position in the longitudinal direction of the workpiece can be arbitrarily changed. Therefore, when the workpiece is used as, for example, a developing sleeve, the developing sleeve is pumped up at an arbitrary position. The amount can be increased and the pumping amount at an arbitrary position can be reduced. For this reason, the surface roughness of the developing sleeve where the pumping amount is small can be roughened, and the pumping amount at the small position can be increased. In addition, the outer surface of the developing sleeve is subjected to a roughening process so that the image formed by the image forming apparatus provided with the developing sleeve can be prevented from being uneven, and thus the image can be prevented from being uneven. Can do. Furthermore, it is possible to roughen the outer surface of the workpiece by simply generating a rotating magnetic field, so there is no need to generate a strong wind as in sandblasting, thus reducing power consumption. It is possible to roughen the outer surface of the workpiece at a low cost.

  According to the surface treatment apparatus of the second aspect, since the control unit changes the strength of the rotating magnetic field according to a predetermined pattern, the surface roughness of the workpiece can always be formed in a constant pattern.

  According to the surface treatment apparatus of the third aspect, since the control means makes the rotating magnetic field when processing both end portions stronger than the rotating magnetic field when processing the central portion, the surface roughness of the both end portions where the pumping amount is small. The surface roughness of the central portion where the pumping amount is large can be made rougher.For this reason, the surface roughness of both end portions where the pumping amount of the developing sleeve as the processing object is small is roughened, and the pumping amount of the both end portions is increased. In addition, it is possible to reliably prevent unevenness in the image formed by the image forming apparatus including the developing sleeve, and thus to prevent the unevenness of the image from occurring. The surface treatment can be reliably performed.

  According to the surface treatment apparatus of claim 4, since the control means can change the moving speed of the magnetic field generation unit based on the relative position of the magnetic field generation unit with respect to the storage tank, that is, the workpiece, If the moving speed of the magnetic field generator increases, the number of times that the magnetic abrasive grains collide with the workpiece decreases, and the surface roughness of the outer surface of the workpiece decreases, whereas if the moving speed of the magnetic field generator decreases, the magnetic field generator becomes magnetic. The number of times the abrasive grains collide with the workpiece increases, and the surface roughness of the outer surface of the workpiece increases.

  As a result, the surface roughness of the outer surface at an arbitrary position in the longitudinal direction of the workpiece can be arbitrarily changed. Therefore, when the workpiece is used as, for example, a developing sleeve, the developing sleeve is pumped up at an arbitrary position. The amount can be increased and the pumping amount at an arbitrary position can be reduced. For this reason, the surface roughness of the developing sleeve where the pumping amount is small can be roughened, and the pumping amount at the small position can be increased. In addition, the outer surface of the developing sleeve is subjected to a roughening process so that the image formed by the image forming apparatus provided with the developing sleeve can be prevented from being uneven, and thus the image can be prevented from being uneven. Can do.

  According to the surface treatment apparatus of the fifth aspect, since the control means changes the moving speed of the magnetic field generation unit according to a predetermined pattern, the surface roughness of the workpiece can always be formed in a constant pattern. .

  According to the surface treatment apparatus of the sixth aspect, since the moving speed when the control means processes both end portions is slower than the moving speed when processing the central portion, the surface roughness of both end portions where the pumping amount is small. The surface roughness of the central portion where the pumping amount is large can be made rougher.For this reason, the surface roughness of both end portions where the pumping amount of the developing sleeve as the processing object is small is roughened, and the pumping amount of the both end portions is increased. The outer surface of the developing sleeve can be surely prevented from causing unevenness in the image formed by the image forming apparatus provided with the developing sleeve, and thus the unevenness of the outer surface of the developing sleeve can be prevented from occurring. Can be reliably applied.

  According to the surface treatment apparatus of the seventh aspect, the partitioning means partitions the space in the storage tank in the longitudinal direction. For this reason, the partition means limits the area (rotation / revolution area) in which the magnetic abrasive grains can move, and enables more efficient processing.

  Moreover, since it can control that a magnetic abrasive grain moves beyond a partition means, a magnetic abrasive grain and a rotating magnetic field can be moved relatively reliably, and this magnetic abrasive grain can be demagnetized reliably. Therefore, the time for demagnetizing the magnetic abrasive grains can be shortened in addition to the processing of the workpiece. For this reason, the continuous processing over a long time of a processing object becomes possible, and the processing efficiency of surface treatment can be improved more. Therefore, it is possible to reliably obtain a surface treatment apparatus as a mass production apparatus on the premise of mass production of a workpiece.

  According to the surface treatment apparatus of the eighth aspect, since the workpiece is held at the center of the storage tank, the magnetic abrasive grains can collide with the outer surface of the workpiece in a substantially uniform manner. The outer surface of the processing object can be processed uniformly.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2, 4 to 8. FIG. 1 is a perspective view showing a configuration of a surface treatment apparatus according to an embodiment of the present invention. 2 is a cross-sectional view of the storage tank and the like of the surface treatment apparatus shown in FIG.

  The surface processing apparatus 1 performs a roughening process on the outer surface of the cylindrical workpiece 2 shown in FIG. 2 to develop a developing roller 115 used in an image forming apparatus such as a copying machine, a facsimile machine, or a printer. The developing sleeve 132 (shown in FIG. 7). The outer diameter of the workpiece 2 is preferably about 17 mm to 18 mm. The length of the workpiece 2 in the direction of the axis P (indicated by the alternate long and short dash line in FIG. 2) is preferably about 300 mm to 350 mm. The surface roughness of the outer surface of the developing sleeve 132 is gradually increased (roughened) from the central portion in the axial direction of the developing sleeve 132 toward both ends.

  As shown in FIG. 1, the surface treatment apparatus 1 includes a base 3, a fixed holding unit 4, an electromagnetic coil moving unit 5 as a moving means, a moving holding unit 6, a moving chuck unit 7, and a magnetic field generating unit. The electromagnetic coil 8, the storage tank 9, the collection | recovery part 10, the cooling part 11, the linear encoder 75 as a detection means, and the control apparatus 76 (shown in FIG. 2) as a control means are provided.

  The base 3 is formed in a flat plate shape and is installed on a factory floor or table. The upper surface of the base 3 is kept parallel to the horizontal direction. The planar shape of the base 3 is formed in a rectangular shape.

  The fixed holding portion 4 includes a plurality of support columns 12 erected from one end in the longitudinal direction of the base 3 (hereinafter, indicated by an arrow X), a holding base 13, a standing bracket 14, a cylindrical holding member 15, and a holding member. And a chuck 16.

  The holding base 13 is formed in a flat plate shape and is attached to the upper end of the support column 12. The standing bracket 14 is formed in a flat plate shape and stands from the holding base 13. The cylindrical holding member 15 is formed in a cylindrical shape, and is attached to the standing bracket 14 and the holding base 13. The cylindrical holding member 15 is disposed closer to the center of the base 3 than the upright bracket 14 in a state in which the axis is parallel to both the horizontal direction and the arrow X. The cylindrical holding member 15 accommodates flange members 51b, 51c, 51d (that is, one end portion 9a), which will be described later, attached to one end portion 9a, which will be described later, of the storage tank 9.

  The holding chuck 16 is disposed in the vicinity of the above-described cylindrical holding member 15, that is, the holding base 13, and is attached to the above-described base 3. The holding chuck 16 chucks the storage tank 9 in which the one end 9 a is stored in the cylindrical holding member 15, and holds the one end 9 a of the storage tank 9. The fixed holding portion 4 having the above-described configuration holds the one end portion 9 a of the storage tank 9.

  The electromagnetic coil moving unit 5 includes a pair of linear guides 17, an electromagnetic coil holding base 18, and an electromagnetic coil moving actuator 19. The linear guide 17 includes a rail 20 and a slider 21. The rail 20 is installed on the base 3. The rail 20 is formed in a straight line, and its longitudinal direction is arranged in parallel to the longitudinal direction of the base 3, that is, the arrow X. The slider 21 is supported by the rail 20 so as to be movable along the longitudinal direction of the rail 20, that is, along the arrow X. In the pair of linear guides 17, the rails 20 are arranged at intervals from each other along the width direction of the base 3 (hereinafter, indicated by an arrow Y). Of course, the arrow X and the arrow Y are orthogonal to each other and parallel to the horizontal direction.

  The electromagnetic coil holding base 18 is formed in a flat plate shape and is mounted on the slider 21 described above. The upper surface of the electromagnetic coil holding base 18 is arranged in parallel with the horizontal direction. The electromagnetic coil holding base 18 installs the electromagnetic coil 8 on the surface. The electromagnetic coil moving actuator 19 is attached to the base 3 and slides the electromagnetic coil holding base 18 along the arrow X. The above-described electromagnetic coil moving unit 5 slides the electromagnetic coil holding base 18, that is, the electromagnetic coil 8 along the arrow Y by the electromagnetic coil moving actuator 19. Moreover, the moving speed of the electromagnetic coil 8 by the electromagnetic coil moving part 5 can be changed between 0 mm / second and 300 mm / second. Furthermore, the moving range of the electromagnetic coil 8 of the electromagnetic coil moving part 5 is about 600 mm.

  The movable holding unit 6 includes a pair of linear guides 22, a holding base 23, a first actuator 24, a second actuator 25, a moving base 26, a bearing rotating unit 27, and a holding chuck 28. .

  The linear guide 22 includes a rail 29 and a slider 30. The rail 29 is installed on the base 3. The rail 29 is formed in a straight line, and its longitudinal direction is arranged in parallel with the arrow X, that is, the longitudinal direction of the base 3. The slider 30 is supported by the rail 29 so as to be movable along the longitudinal direction of the rail 29, that is, along the arrow X. In the pair of linear guides 22, rails 29 are arranged at intervals along the arrow Y, that is, the width direction of the base 3.

  The holding base 23 is formed in a flat plate shape and is mounted on the slider 30 described above. The upper surface of the holding base 23 is arranged in parallel with the horizontal direction. The first actuator 24 is attached to the base 3 and slides the holding base 23 described above along the arrow X.

  The second actuator 25 is attached to the holding base 23 and slides the moving base 26 along the arrow Y. The moving base 26 is formed in a flat plate shape, and its upper surface is arranged in parallel with the horizontal direction.

  The bearing rotating unit 27 includes a pair of bearings 31, a hollow holding member 32 as a core shaft, a driving motor 33 as a rotating means, and a chuck cylinder 34. The pair of bearings 31 are arranged on the moving base 26 while being spaced apart from each other along the arrow X. The hollow holding member 32 is made of a magnetic material, is formed in a cylindrical shape, and is supported by the above-described bearing 31 so as to be rotatable around the axis. The hollow holding member 32 has its axis arranged in parallel with the arrow X described above, that is, the axis of the cylindrical holding member 15 of the fixed holding unit 4. The hollow holding member 32 is shaped so as to protrude from the moving base 26 toward the fixed holding portion 4 so that the one end 32 a is located in the storage tank 9, and the other end 32 c is located on the moving base 26. Arranged in the state. The hollow holding member 32 is passed through the cylindrical workpiece 2 as shown in FIG. A pulley 35 is fixed to the other end portion 32 c of the hollow holding member 32 positioned on the moving base 26. The pulley 35 is disposed coaxially with the hollow holding member 32.

  The drive motor 33 is installed on the moving base 26, and a pulley 36 is attached to the output shaft thereof. The axis of the output shaft of the drive motor 33 is parallel to the arrow X. An endless timing belt 37 is wound around the pulleys 35 and 36 described above. The drive motor 33 rotates the hollow holding member 32 around the axis. The drive motor 33 rotates the hollow holding member 32 around the axis to rotate the workpiece 2 around the axis of the hollow holding member 32 parallel to the longitudinal direction of the storage tank 9.

  The chuck cylinder 34 includes a cylinder body 38 installed on the moving base 26 and a chuck shaft 39 slidably provided on the cylinder body 38. The chuck shaft 39 is formed in a cylindrical shape, and its longitudinal direction is arranged in parallel with the arrow X. The chuck shaft 39 is accommodated in the hollow holding member 32 and is disposed coaxially with the hollow holding member 32. A plurality of pairs of chuck claws 40 are attached to the chuck shaft 39.

  The pair of chuck claws 40 are attached to the chuck shaft 39 so as to protrude from the outer peripheral surface of the chuck shaft 39 in the outer peripheral direction of the chuck shaft 39. Further, the chuck pawl 40 can protrude from the outer peripheral surface of the hollow holding member 32 toward the outer periphery of the hollow holding member 32. The chuck claws 40 are provided so that the amount of protrusion from the chuck shaft 39 and the hollow holding member 32 can be changed. The plurality of pairs of chuck claws 40 are arranged at intervals along the longitudinal direction of the chuck shaft 39, that is, the arrow X. When the chuck shaft 39 of the chuck cylinder 34 is reduced in the direction approaching the cylinder body 38, the amount of protrusion of the pair of chuck claws 40 from the chuck shaft 39 and the hollow holding member 32 increases.

  In the chuck cylinder 34 described above, when the chuck shaft 39 is reduced to the cylinder body 38, the chuck pawl 40 protrudes further toward the outer periphery of the chuck shaft 39, and the chuck pawl 40 is attached to the outer periphery of the hollow holding member 32. The chuck shaft 39, the hollow holding member 32, and the workpiece 2 are fixed by pressing against the inner peripheral surface of the workpiece 2. At this time, of course, the chuck shaft 39, the hollow holding member 32, the workpiece 2, and the later-described cylindrical member 50, that is, the storage tank 9 are coaxial.

The chuck cylinder 34 and the chuck pawl 40 described above hold the workpiece 2 so as to be coaxial with the hollow holding member 32 and the storage tank 9. That is, the hollow holding member 32 holds the workpiece 2 at the center of the storage tank 9 with the workpiece 2 fixed by the chuck cylinder 34 and the chuck pawl 40. Medium air retaining member 32 corresponds to the holding means described in the appended claims.

  The holding chuck 28 is installed on the moving base 26 described above. The holding chuck 28 chucks a flange member 51a (described later) attached to the other end 9b of the storage tank 9, and holds the other end 9b of the storage tank 9. The holding chuck 28 restricts the storage tank 9 from rotating about its axis.

  The movement holding unit 6 having the above-described configuration moves the holding chuck 28, the hollow holding member 32, and the like along the arrows X and Y orthogonal to each other by the actuators 24 and 25. That is, the movement holding unit 6 moves the storage tank 9 held by the holding chuck 28 along the arrows X and Y.

  The moving chuck unit 7 includes a holding base 41, a linear guide 42, and a holding chuck 43. The holding base 41 is fixed to an end portion of the linear guide 22 near the fixed holding portion 4 of the rail 29. The holding base 41 is formed in a flat plate shape, and its upper surface is arranged in parallel with the horizontal direction.

  The linear guide 42 includes a rail 44 and a slider 45. The rail 44 is installed on the holding base 41. The rail 44 is formed in a straight line, and its longitudinal direction is arranged in parallel with the arrow Y, that is, the width direction of the base 3. The slider 45 is supported by the rail 44 so as to be movable along the longitudinal direction of the rail 44, that is, along the arrow Y.

  The holding chuck 43 is installed on the slider 45. The holding chuck 43 is positioned between the holding chucks 16 and 28 described above. The holding chuck 43 holds the storage tank 9 by chucking a portion near the other end 9 b of the storage tank 9. The moving chuck portion 7 described above positions the storage tank 9 by the holding chuck 43 holding the storage tank 9. The movable chuck portion 7 holds the storage tank 9 in cooperation with the above-described holding chuck 28 when the storage tank 9 moves along the axis by holding the storage tank 9 by the holding chuck 43. Thus, the storage tank 9 is prevented from falling off the bearing rotating portion 27, that is, the surface treatment apparatus 1.

  As shown in FIG. 2, the electromagnetic coil 8 includes an outer skin 46 formed in a cylindrical shape and a plurality of coil portions 47 arranged in the outer skin 46, and is formed in an annular shape as a whole. The inner diameter of the electromagnetic coil 8 is larger than the outer diameter of the storage tank 9. That is, a space is formed between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9. Further, the total length of the electromagnetic coil 8 in the axial direction is sufficiently shorter than the total length of the storage tank 9 in the axial direction. The total length of the electromagnetic coil 8 in the axial direction is preferably 2/3 or less of the total length of the storage tank 9 in the axial direction. In the illustrated example, the inner diameter of the electromagnetic coil 8 is 90 mm, and the length of the electromagnetic coil 8 in the axial direction is 85 mm.

  The outer skin 46 is attached to the above-described electromagnetic coil holding base 18 with its axis, that is, the axis of the electromagnetic coil 8 itself, parallel to the arrow X. The electromagnetic coil 8 is disposed coaxially with the hollow holding member 32, the chuck shaft 39 and the storage tank 9. The plurality of coil portions 47 are arranged in parallel along the circumferential direction of the outer skin 46, that is, the electromagnetic coil 8. The coil unit 47 is applied by a three-phase AC power source 48 shown in FIG. The plurality of coil portions 47 are applied with power that is shifted from each other, and the plurality of coil portions 47 generate magnetic fields that are out of phase with each other. And the electromagnetic coil 8 produces | generates the magnetic field (rotating magnetic field) of the rotation direction around the axial center of this electromagnetic coil 8 formed by synthesize | combining these magnetic fields inside.

  The electromagnetic coil 8 described above is applied from a three-phase AC power supply 48 to generate a rotating magnetic field, and is moved by the electromagnetic coil moving unit 5 along the longitudinal direction of its axis, that is, the storage tank 9. And the electromagnetic coil 8 positions the below-mentioned magnetic abrasive grain 65 on the outer periphery of the workpiece 2 by the rotating magnetic field described above, and rotates the magnetic abrasive grain 65 around the axis of the storage tank 9 and the workpiece 2 ( Move). The electromagnetic coil 8 causes the magnetic abrasive grains 65 to collide with the outer surface of the workpiece 2 by the rotating magnetic field described above.

  Further, an inverter 49 as a magnetic field changing unit is provided between the three-phase AC power supply 48 and the electromagnetic coil 8. That is, the surface treatment apparatus 1 includes an inverter 49 as a magnetic field changing unit. The inverter 49 can freely change the frequency, current value, and voltage value of the power applied to the electromagnetic coil 8 by the three-phase AC power supply 48. The inverter 49 changes the frequency, current value, and voltage value of the power applied to the electromagnetic coil 8 to increase or decrease the power applied to the electromagnetic coil 8 by the three-phase AC power supply 48, thereby generating the electromagnetic coil 8. Change the strength of the rotating magnetic field.

  As shown in FIG. 2, the storage tank 9 includes a cylindrical member 50 having a single outer wall (the outer wall is made of a single wall), a plurality of flange members 51, a pair of shaving sealing holders 52, A pair of shavings sealing plates 53, a pair of positioning members 54, a partition member 55 as a plurality of partitioning means, and a pair of sealing plates 56 are provided.

  The cylindrical member 50 is formed in a cylindrical shape and constitutes an outer shell of the storage tank 9. For this reason, the storage tank 9 is formed in a cylindrical shape while the outer wall is formed in a single structure because the cylindrical member 50 is formed in a single structure. The outer diameter of the cylindrical member 50, that is, the storage tank 9, is desirably about 40 mm to 80 mm. Furthermore, the thickness of the cylindrical member 50 is desirably about 0.5 mm to 2.0 mm. The length of the cylindrical member 50 in the axial direction is preferably about 600 mm to 800 mm. The cylindrical member 50 is made of a nonmagnetic material.

  The cylindrical member 50 is provided with a plurality of abrasive grain supply holes 57. Of course, the abrasive grain supply hole 57 passes through the cylindrical member 50 and communicates with the inside and outside of the cylindrical member 50. A sealing cap 58 is attached to the abrasive grain supply hole 57. The abrasive grain supply hole 57 passes the magnetic abrasive grains 65 inward, and puts the magnetic abrasive grains 65 into and out of the cylindrical member 50, that is, the storage tank 9. Further, the sealing cap 58 closes the abrasive grain supply hole 57 and restricts the magnetic abrasive grains 65 from flowing out of the cylindrical member 50, that is, the storage tank 9.

  The plurality of flange members 51 are formed in an annular shape or a cylindrical shape. Most flange members 51 (three in the illustrated example) except for one of the plurality of flange members 51 are attached to one end portion 9a of the cylindrical member 50, and one flange member 51 (hereinafter denoted by reference numeral 51a). ) Is attached to the other end 9 b of the cylindrical member 50.

  One flange member 51 (hereinafter, denoted by reference numeral 51b) among the plurality of flange members 51 attached to the one end 9a of the cylindrical member 50 is formed in an annular shape and is fitted to the outer periphery of the cylindrical member 50. Yes. Another flange member 51 (hereinafter denoted by reference numeral 51c) is formed in an annular shape and is fitted to the outer periphery of the flange member 51b described above. The remaining flange member 51 (hereinafter denoted by reference numeral 51d) is integrally provided with an annular ring portion 59 and a cylindrical column portion 60. The ring part 59 is standing upright from the outer edge of the cylindrical part 60. As for the flange member 51d, the ring part 59 is fitted to the outer periphery of the flange member 51c.

  A driven shaft 73 is rotatably supported by a bearing 74 on the flange member 51d described above. The driven shaft 73 is formed in a columnar shape and is arranged coaxially with the cylindrical member 50 of the storage tank 9. The hollow holding member 32 is pressed against the end surface of the driven shaft 73. The driven shaft 73 rotates with the hollow holding member 32 and supports one end portion 32 a as a free end of the hollow holding member 32.

  One flange member 51 a described above is formed in an annular shape and is fitted to the outer periphery of the other end portion 9 b of the cylindrical member 50. The flange member 51a passes through the hollow holding member 32 inside. One end 9 a of the cylindrical member 50 forms one end of the storage tank 9, and the other end 9 b of the cylindrical member 50 forms the other end of the storage tank 9.

  Each of the pair of shavings sealing holders 52 is formed in an annular shape. One shaving sealing holder 52 is fitted to the inner circumference of one end 9 a of the cylindrical member 50, and the other shaving sealing holder 52 is fitted to the inner circumference of the other end 9 b of the cylindrical member 50. ing. The other shaving sealing holder 52 passes through the hollow holding member 32 inside.

  The pair of shavings sealing plates 53 are each formed in a mesh shape. One shaving sealing plate 53 is formed in a disc shape and is disposed on the inner periphery of the one end portion 9a of the cylindrical member 50, and is attached to the one shaving sealing holder 52 described above. . Furthermore, one shaving sealing plate 53 passes through the driven shaft 73 on the inner side. The other shaving sealing plate 53 is formed in an annular shape, and is disposed on the inner periphery of the other end 9b of the cylindrical member 50, and is attached to the other shaving sealing holder 52 described above. . The other shavings sealing plate 53 passes through the hollow holding member 32 inside. The shaving sealing plate 53 has a cylindrical member 50, that is, a storage tank 9, in which shavings formed by the later-described magnetic abrasive grains 65 colliding with the outer surface of the workpiece 2 and scraped off from the workpiece 2. Regulates leaking outside.

  The pair of positioning members 54 are formed in a cylindrical shape. One positioning member 54 is fitted to the outer periphery of one end 32 a which is a free end of the hollow holding member 32. The other positioning member 54 is located in the cylindrical member 50 and is fitted to the outer periphery of the central portion 32b of the hollow holding member 32 near the other end portion 9b. The pair of positioning members 54 positions the workpiece 2 on the hollow holding member 32 with the workpiece 2 sandwiched between them. Note that the one end portion 32 a is an end portion of the hollow holding member 32 that is close to the fixed holding portion 4 and away from the moving holding portion 6. The central portion 32 b is on the side inside the storage tank 9 and away from the fixed holding portion of the hollow holding member 32, and forms an end near the moving holding portion 6.

  The partition member 55 includes a main body portion 61 formed in an annular shape and a mesh portion 62. The main body 61, that is, the partition member 55 is fitted to the inner periphery of the cylindrical member 50, is attached to the cylindrical member 50, and passes through the hollow holding member 32 inside. The main body 61, that is, the plurality of partition members 55 are arranged between the pair of shavings sealing plates 53. Further, the main body portion 61, that is, the plurality of partition members 55 are arranged in parallel along the axis P of the cylindrical member 50, that is, along the longitudinal direction with a space between each other. In the illustrated example, seven partition members 55 are provided.

  A through-hole 63 is provided in the main body 61. The mesh part 62 is attached to the main body part 61 so as to close the through hole 63. The mesh part 62 is formed in a mesh shape and allows gas and shavings to pass therethrough and restricts passage of the magnetic abrasive grains 65.

  The plurality of partition members 55 described above partition the space in the cylindrical member 50, that is, the storage tank 9 along the axial center of the cylindrical member 50, that is, the storage tank 9, that is, the axis P of the workpiece 2. In addition, the shaft core P forms both the shaft core of the storage tank 9 and the shaft core of the hollow holding member 32, and the longitudinal direction of the storage tank 9. That is, the axis P and the longitudinal direction of the storage tank 9 are parallel to each other. Furthermore, both the main body portion 61 and the mesh portion 62 described above, that is, the partition member 55 are made of a nonmagnetic material.

  The pair of sealing plates 56 are formed in an annular shape. In addition, the sealing plate 56 is formed in a mesh shape, allows gas and shavings to pass, and restricts passage of the magnetic abrasive grains 65. One sealing plate 56 is attached to the partition member 55 closest to the one end 9a, and the other sealing plate 56 is attached to the partition member 55 closest to the other end 9b. The sealing plate 56 passes the caps 64 (described later) attached to both ends of the workpiece 2 inside. The sealing plate 56 restricts the passage of the magnetic abrasive grains 65 positioned between the partition members 55, and restricts the magnetic abrasive grains 65 from flowing out of the cylindrical member 50, that is, the storage tank 9.

  The storage tank 9 having the above-described configuration stores abrasive grains (hereinafter, referred to as magnetic abrasive grains) 65 made of a magnetic material between the plurality of partition members 55 and is attached to the hollow holding member 32. 2 is accommodated in the cylindrical member 50. That is, the storage tank 9 stores both the workpiece 2 and the magnetic abrasive grains 65. Further, the magnetic abrasive grains 65 collide with the outer surface of the workpiece 2 by rotating (moving) the outer periphery of the workpiece 2 by the rotating magnetic field described above. The magnetic abrasive grains 65 collide with the outer surface of the workpiece 2, scrape a part of the workpiece 2 from the outer surface of the workpiece 2, and roughen the outer surface of the workpiece 2. . In the illustrated example, the magnetic abrasive grains 65 are formed in a cylindrical shape, and the size thereof is about 0.5 mm to 1.4 mm in outer diameter and about 3.0 mm to 14.0 mm in total length.

  As shown in FIG. 2, the collection unit 10 includes a gas inflow pipe 66, a gas discharge hole 67, a mesh member 68, a gas discharge duct 69, and a dust collector 70 (shown in FIG. 1). . The gas inflow pipe 66 is provided closer to the end of the cylindrical member 50, that is, the storage tank 9 (moving holding portion 6) than the other shaving sealing holder 52, and opens to the inside of the cylindrical member 50, that is, the storage tank 9. The gas inflow pipe 66 is supplied with pressurized gas or the like from a pressurized gas supply source (not shown). The gas inflow pipe 66 guides the pressurized gas into the cylindrical member 50, that is, the storage tank 9.

  The gas discharge hole 67 penetrates through the cylindrical member 50 and communicates the inside and outside of the storage tank 9, and is closer to the end of the cylindrical member 50, that is, the storage tank 9 than one shaving sealing holder 52 (moving and holding unit). (The side away from 6). The mesh member 68 is attached to the cylindrical member 50 so as to close the gas discharge hole 67. The mesh member 68 allows the shavings and gas to pass therethrough and restricts the magnetic abrasive grains 65 from passing therethrough. The mesh member 68 restricts the magnetic abrasive grains 65 from flowing out of the cylindrical member 50, that is, the outside of the storage tank 9.

  The gas exhaust duct 69 is a pipe and is attached in the vicinity of the gas exhaust hole 67. The gas discharge duct 69 surrounds the outer edge of the gas discharge hole 67. The gas discharge hole 67 and the gas discharge duct 69 guide the gas supplied from the gas inflow pipe 66 into the cylindrical member 50, that is, the storage tank 9, to the outside of the cylindrical member 50, that is, the storage tank 9.

  The dust collector 70 is connected to the gas discharge duct 69 and sucks the gas in the gas discharge duct 69. The dust collector 70 sucks the gas in the gas discharge duct 69 to suck the gas in the cylindrical member 50, that is, the storage tank 9 together with the above-described shavings. The dust collector 70 collects shavings. The recovery unit 10 described above supplies gas into the cylindrical member 50, that is, the storage tank 9 through the gas inflow pipe 66, and the gas and dust collector 70 pass the gas through the gas exhaust hole 67 and the gas exhaust duct 69 to remove the shavings into the cylindrical member. 50, that is, the outside of the storage tank 9. Then, the collection unit 10 collects shavings in the dust collector 70.

  As shown in FIG. 1, the cooling unit 11 includes a cooling fan 71 and a cooling duct 72. The cooling fan 71 supplies the pressurized gas to the cooling duct 72. The cooling duct 72 is a pipe. The cooling duct 72 guides the pressurized gas supplied from the cooling fan 71 to the electromagnetic coil 8. The cooling duct 72 blows the pressurized gas supplied from the cooling fan 71 to the electromagnetic coil 8. The cooling unit 11 cools the electromagnetic coil 8 by blowing a pressurized gas onto the electromagnetic coil 8.

  As shown in FIG. 2, the linear encoder 75 includes a main body 77 and a detector 78 that is movably provided on the main body 77. The main body 77 extends linearly and is attached to the base 3. The main body 77 is disposed between the pair of rails 20 in parallel with the rails 20. The overall length of the main body 77 is longer than the storage tank 9 described above. The main body 77 is disposed at a position where both end portions in the longitudinal direction protrude outward from the housing tank 9 described above along the longitudinal direction of the housing tank 9.

  The detector 78 is provided so as to be movable along the longitudinal direction of the main body 77, that is, the storage tank 9. The detector 78 is attached to the electromagnetic coil holding base 18. That is, the detector 78 is attached to the electromagnetic coil 8 via the electromagnetic coil holding base 18.

  The linear encoder 75 described above detects the position of the detector 78 with respect to the main body 77, that is, the storage tank 9, and outputs the detected result toward the control device 76. In this way, the linear encoder 75 detects the relative position of the electromagnetic coil 8 with respect to the storage tank 9, that is, the workpiece 2, and outputs the detection result toward the control device 76.

  The control device 76 is a computer including a known RAM, ROM, CPU, and the like. The control device 76 is connected to the electromagnetic coil moving unit 5, the movement holding unit 6, the moving chuck unit 7, the electromagnetic coil 8, the inverter 49, the recovery unit 10, the cooling unit 11, the linear encoder 75, and the like. These are controlled to control the entire surface treatment apparatus 1.

  The control device 76 stores the strength of the rotating magnetic field of the electromagnetic coil 8 according to the relative position of the electromagnetic coil 8 detected by the linear encoder 75 with respect to the workpiece 2. That is, the control device 76 stores the power applied to the electromagnetic coil 8 by the inverter 49 according to the relative position of the electromagnetic coil 8 with respect to the workpiece 2. Further, the control device 76 stores the above-described electric power for each product number, that is, for each product number of the developing sleeve 132.

  In the illustrated example, the control device 76 gradually increases the power applied by the inverter 49 to the electromagnetic coil 8 as the electromagnetic coil 8 moves from the central portion in the longitudinal direction (axial direction) of the workpiece 2 to both ends. A pattern is stored in advance. Then, the control device 76 causes the inverter 49 to change the strength of the rotating magnetic field generated by the electromagnetic coil 8 in accordance with the previously stored power pattern. As described above, in the illustrated example, the control device 76 uses an inverter so that the rotating magnetic field when machining both ends of the workpiece 2 is stronger than the rotating magnetic field when machining the central portion of the workpiece 2. 49, the intensity of the magnetic field generated by the electromagnetic coil 8 is changed. As described above, the control device 76 determines the rotational magnetic field generated by the electromagnetic coil 8 in the inverter 49 based on the relative position of the electromagnetic coil 8 detected by the linear encoder 75 with respect to the storage tank 9, that is, the workpiece 2. Change the strength.

  Further, various input devices such as a keyboard and various display devices such as a display are connected to the control device 76.

  Next, a process of manufacturing the developing sleeve 132 by processing (roughening) the outer surface of the workpiece 2 using the surface processing apparatus 1 having the above-described configuration will be described below.

  First, the processing object 2, that is, the product number of the developing sleeve 132 is input from the input device to the control device 76. And the cylindrical cap 64 is fitted to the outer periphery of the both ends of the longitudinal direction (axial direction) of the workpiece 2. Then, the other positioning member 54 described above is fitted to the outer periphery of the hollow holding member 32. Then, the hollow holding member 32 is passed through the workpiece 2 having caps 64 attached to both ends. Thereafter, the one positioning member 54 described above is fitted to the outer periphery of the hollow holding member 32. Then, the chuck shaft 39 of the chuck cylinder 34 is reduced, and the workpiece 2 is fixed to the hollow holding member 32. At this time, the hollow holding member 32 and the workpiece 2 are coaxial. In this way, the workpiece 2 is attached to the hollow holding member 32.

  Then, the workpiece 2 and the hollow holding member 32 are accommodated in the accommodating tank 9, and the magnetic abrasive grains 65 are supplied into the cylindrical member 50 of the accommodating tank 9. Thus, the magnetic abrasive grains 65 and the workpiece 2 are stored in the storage tank 9. Further, the storage tank 9 is chucked by the holding chucks 28 and 43. In this way, the workpiece 2 and the storage tank 9 are attached to the movable holding unit 6. Then, the cylindrical member 50, the hollow holding member 32, the workpiece 2 and the like of the storage tank 9 become coaxial.

  Of course, the above-described operation is performed while adjusting the position of the moving base 26 with the actuators 24 and 25. Furthermore, the above-described operation is, of course, performed while adjusting the position of the holding base 41. The holding chuck 16 causes the one end 9a of the storage tank 9 to be chucked, for example, so that the fixed holding section 4 holds the one end 9a of the storage tank 9.

  And while supplying gas in the storage tank 9 through the gas inflow pipe 66 of the collection | recovery part 10, while attracting | sucking the gas in the storage tank 9 with the dust collector 70, the gas pressurized by the cooling part 11 is made into the electromagnetic coil 8. Let spray.

  Then, the workpiece 2 is rotated around the axis P together with the hollow holding member 32 by the driving motor 33. Thereafter, electric power from the three-phase AC power supply 48 is applied to the electromagnetic coil 8 to generate a rotating magnetic field in the electromagnetic coil 8. Then, the magnetic abrasive grains 65 located inside the electromagnetic coil 8 revolve (rotate or move) around the axis P while rotating, and the magnetic abrasive grains 65 collide with the outer surface of the workpiece 2, The outer surface of the workpiece 2 is roughened.

  And the electromagnetic coil moving part 5 moves the electromagnetic coil 8 along the axial core P suitably. Then, the magnetic abrasive grains 65 that have entered the inside of the electromagnetic coil 8 move (spin and revolve) by the rotating magnetic field described above, and the magnetic abrasive grains 65 that have escaped from the inside of the electromagnetic coil 8 stop. Further, since the partition member 55 partitions the space in the storage tank 9, the magnetic abrasive grains 65 are restricted from moving beyond the partition member 55, and the magnetic abrasive grains 65 that have escaped from the inside of the electromagnetic coil 8 are described above. Will escape from the rotating magnetic field. Further, when the electromagnetic coil moving unit 5 reciprocates the electromagnetic coil 8 a predetermined number of times along the arrow X, the roughening of the outer surface of the workpiece 2 is completed.

  Further, the rotating magnetic field generated by the electromagnetic coil 8 becomes stronger as the electromagnetic coil 8 moves from the center of the workpiece 2 toward both ends. As the rotating magnetic field becomes stronger, the movement of the magnetic abrasive grains 65 becomes more intense. Then, as the rotating magnetic field increases, the magnetic abrasive grains 65 collide with the object to be processed more vigorously, and the surface roughness of the outer surface of the object 2 becomes rougher.

  When the above-described roughening of the outer surface of the workpiece 2 is finished, the application of power to the electromagnetic coil 8 is stopped and the drive motor 33 is stopped. Further, the recovery unit 10 and the cooling unit 11 are stopped. Then, the holding tank 16 of the holding chuck 16 of the fixed holding unit 4 is released from holding, and the holding chuck 43 of the moving chuck unit 7 and the holding chuck 28 of the moving holding unit 6 hold the holding tank 9 while holding the holding tank 9. The moving base 26 is separated from the fixed holding portion 4 along the arrow X by the actuator 24. Then, the storage tank 9 is separated from the fixed holding part 4. Then, the processing target object 2 whose outer surface has been roughened is taken out from the storage tank 9, and the new processing target object 2 is stored in the storage tank 9. In this way, the outer surface of the workpiece 2 is roughened, and the developing sleeve 132 is obtained in which the surface roughness of the outer surface gradually becomes rougher from the central portion toward both ends.

  According to the present embodiment, the control device 76 can change the strength of the rotating magnetic field generated by the electromagnetic coil 8 based on the relative position of the electromagnetic coil 8 with respect to the storage tank 9, that is, the workpiece 2. For this reason, when the rotating magnetic field becomes strong, the movement of the magnetic abrasive grains 65 becomes active, and the kinetic energy when the magnetic abrasive grains 65 collide with the outer surface of the workpiece 2 increases. The surface roughness of the outer surface becomes rough.

  Thereby, the surface roughness of the outer surface of the arbitrary position of the longitudinal direction (axial direction) of the workpiece 2 can be changed arbitrarily. Therefore, when the workpiece 2 is used as the developing sleeve 132, the pumping amount at an arbitrary position of the developing sleeve 132 can be increased and the pumping amount at an arbitrary position can be reduced. Accordingly, it is possible to increase the surface roughness of the developing sleeve 132 where the pumping amount is small and increase the pumping amount of the developing sleeve 132, and the image formed by the image forming apparatus 101 including the developing sleeve 132 is uneven. It can be prevented from occurring. Therefore, the surface of the developing sleeve 132 can be roughened so that unevenness of the image can be prevented. Furthermore, since the surface treatment apparatus 1 can perform a roughening process on the outer surface of the developing sleeve 132 only by generating a rotating magnetic field, it is not necessary to generate a strong wind as in sandblasting. Power consumption can be suppressed, and a roughening process can be performed on the outer surface of the developing sleeve 132 at low cost.

  Since the control device 76 changes the strength of the rotating magnetic field according to a predetermined pattern, the roughening process can be performed on the outer surface of the workpiece 2 in a constant pattern at all times.

  Since the rotating magnetic field used when the control device 76 processes both ends is made stronger than the rotating magnetic field used when processing the central portion, the surface roughness of both end portions where the pumping amount of the developing sleeve 132 is small is increased. It can be made rougher than the surface roughness. Therefore, the surface roughness of both ends of the developing sleeve 132 with a small amount of pumping can be increased to increase the amount of pumping at both ends, and the image formed by the image forming apparatus 101 having the developing sleeve 132 can be formed. Unevenness can be reliably prevented. Therefore, it is possible to reliably perform the roughening process on the outer surface of the developing sleeve 132 so that unevenness of the image can be prevented.

  By moving the electromagnetic coil 8, the workpiece 2 is processed, and at the same time, the magnetic abrasive grains 65 suddenly escape from the rotating magnetic field. For this reason, the strength of the magnetic field acting on the magnetic abrasive grains 65 is suddenly changed (decreased), and the magnetic domains aligned in the magnetic abrasive grains 65 become uneven, whereby the magnetization is weakened, and the workpiece 2 Simultaneously with the processing, the effect of removing the residual magnetization of the magnetic abrasive grains 65 is exhibited.

  As a result, a degaussing device or the like that removes the residual magnetization of the magnetic abrasive grains 65 that is separate from the surface treatment device 1 becomes unnecessary. Therefore, it is possible to easily demagnetize the magnetic abrasive grains 65, and it is possible to continuously process the workpiece 2 for a long time, thereby improving the processing efficiency of the surface treatment. Therefore, it is possible to obtain the surface treatment apparatus 1 as a mass production apparatus on the premise of mass production of the workpiece 2.

  Since the workpiece 2 is held at the center of the storage tank 9, the magnetic abrasive grains 65 can collide with the outer surface of the workpiece 2 almost uniformly. Therefore, the outer surface of the workpiece 2 can be processed uniformly.

  By moving (revolving) the magnetic abrasive grains 65 on the outer periphery of the workpiece 2, the magnetic abrasive grains 65 can be reliably collided with the outer surface of the workpiece 2, and the machining of the workpiece 2 is ensured. Can be done.

  Since the workpiece 2 is rotated, the magnetic abrasive grains 65 can be uniformly collided with the outer surface of the workpiece 2 and the outer surface of the workpiece 2 can be processed more uniformly.

  Since the electromagnetic coil 8 is shorter than the storage tank 9, it is possible to increase the rotating magnetic field and cause the electromagnetic coil 8 to be generated in the storage tank 9 as compared with the case where the electromagnetic coil 8 uses a surface treatment apparatus having a length substantially equal to that of the storage tank 9. Loss of rotating magnetic field can be reduced. Therefore, it is possible to improve the processing efficiency of the processing object 2 and further reduce power consumption.

  Moreover, since the electromagnetic coil 8 is shorter than the storage tank 9, both ends of the storage tank 9 can be supported. Thereby, it is possible to prevent the storage tank 9 from vibrating (moving) due to the movement of the magnetic abrasive grains 65 and the like, and the magnetic abrasive grains 65 can collide more uniformly with the outer surface of the workpiece 2. The outer surface of the object 2 can be processed more uniformly.

  Since the storage tank 9 is cylindrical, the storage tank 9 does not hinder the circumferential behavior of the magnetic abrasive grains 65 when a rotating magnetic field is applied to the magnetic abrasive grains 65. Therefore, stable processing is possible.

  The partition member 55 partitions the space in the storage tank 9 in the longitudinal direction. For this reason, the partition member 55 limits the area (rotation / revolution area) in which the magnetic abrasive grains 65 can move, thereby enabling more efficient processing.

  Further, since the magnetic abrasive grains 65 can be restricted from moving beyond the partition member 55, the magnetic abrasive grains 65 and the rotating magnetic field can be reliably moved relative to each other, and the magnetic abrasive grains 65 can be reliably demagnetized. it can.

  Since the partition member 55 is not magnetized because it is made of a non-magnetic material, the partition member 55 interferes with the behavior of the magnetic abrasive grains 65, or shavings or the like are magnetized and stick to the partition member 55. Absent. For this reason, it becomes possible to process stably.

  Since a plurality of partition members 55 are provided, it is possible to divide the range where the outer surface of the workpiece 2 is roughened. For this reason, the partition member 55 surely limits the region (rotation / revolution region) in which the magnetic abrasive grains 65 can move, thereby enabling more efficient processing.

  Further, since the magnetic abrasive grains 65 can be restricted from moving beyond the partition member 55, the magnetic abrasive grains 65 can be reliably demagnetized.

  Since the outer wall of the cylindrical member 50 of the storage tank 9 has a single structure, the distance from the electromagnetic coil 8 to the workpiece 2 can be shortened, and the rotating magnetic field generated by the electromagnetic coil 8 can be processed more efficiently. Can be used.

  The sealing plate 56 makes it possible to prevent the magnetic abrasive grains 65 from flowing out of the storage tank 9, improving workability and productivity during processing, and the effect is further enhanced by continuous processing. The processing device 1 can produce (process) the workpiece 2 as a mass production device on the premise of mass production.

  In the embodiment described above, the rotating magnetic field generated by the electromagnetic coil 8 is gradually strengthened as the control device 76 moves toward both ends of the workpiece 2. However, in the present invention, the control device 76 increases the rotating magnetic field generated by the electromagnetic coil 8 stepwise as the control device 76 moves toward the both ends of the workpiece 2 to process both ends of the workpiece 2. You may make a rotating magnetic field stronger than the rotating magnetic field at the time of processing the center part of the workpiece 2.

  Further, in the present invention, an arbitrary portion of the workpiece 2 is formed without making the rotating magnetic field when machining both ends of the workpiece 2 stronger than the rotating magnetic field when machining the central portion of the workpiece 2. The rotating magnetic field at the time of processing may be made stronger than the rotating magnetic field at the time of processing other parts of the workpiece 2.

  Further, the position of the electromagnetic coil 8 may be detected using various sensors without being limited to the linear encoder 75.

  Further, in the present invention, the control device 76 differentiates the position of the electromagnetic coil 8 detected by the linear encoder 75 with respect to time to obtain the moving speed of the electromagnetic coil 8, and generates a rotating magnetic field during processing of the workpiece 2. The moving speed of the electromagnetic coil 8 may be changed without changing the strength.

  In this case, the control device 76 stores the moving speed of the electromagnetic coil 8 according to the relative position of the electromagnetic coil 8 detected by the linear encoder 75 with respect to the workpiece 2. That is, the control device 76 stores the speed at which the electromagnetic coil moving unit 5 moves the electromagnetic coil 8 according to the relative position of the electromagnetic coil 8 with respect to the workpiece 2. In addition, the control device 76 stores the moving speed described above for each workpiece number, that is, for each product number of the developing sleeve 132.

  The control device 76 is a pattern in which the speed at which the electromagnetic coil moving unit 5 moves the electromagnetic coil 8 gradually decreases as the electromagnetic coil 8 moves from the central portion in the longitudinal direction (axial direction) of the workpiece 2 toward both ends. Is stored in advance. And the control apparatus 76 makes the electromagnetic coil moving part 5 change the speed which the electromagnetic coil 8 moves according to the pattern of the moving speed mentioned above memorize | stored beforehand. As described above, the control device 76 has a moving speed of the electromagnetic coil 8 when machining both ends of the workpiece 2 slower than a moving speed of the electromagnetic coil 8 when machining the central portion of the workpiece 2. As described above, the moving speed of the electromagnetic coil 8 is changed by the electromagnetic coil moving unit 5. As described above, the control device 76 moves the electromagnetic coil 8 to the electromagnetic coil moving unit 5 based on the relative position of the electromagnetic coil 8 detected by the linear encoder 75 with respect to the storage tank 9, that is, the workpiece 2. Change the speed.

  Thus, when the control device 76 changes the speed at which the electromagnetic coil 8 of the electromagnetic coil moving unit 5 is moved, the inverter 49 described above may not be provided.

  When the control device 76 changes the speed at which the electromagnetic coil 8 of the electromagnetic coil moving unit 5 is moved, the number of times that the magnetic abrasive grains 65 collide with the workpiece 2 decreases as the moving speed of the electromagnetic coil 8 increases. The surface roughness of the outer surface of the object 2 is reduced. On the other hand, when the moving speed of the electromagnetic coil 8 becomes slow, the number of times that the magnetic abrasive grains 65 collide with the workpiece 2 increases and the surface roughness of the outer surface of the workpiece 2 increases. Thereby, the surface roughness of the outer surface of the arbitrary position of the longitudinal direction (axial direction) of the workpiece 2 can be changed arbitrarily.

  Further, since the control device 76 changes the moving speed of the electromagnetic coil 8 according to a predetermined pattern, the surface roughness of the workpiece 2 can be always formed in a constant pattern.

  Furthermore, since the moving speed when the control device 76 processes both ends is slower than the moving speed when processing the central portion, the surface roughness of the central portion where the pumping amount is large is obtained by reducing the surface roughness at both ends where the pumping amount is small. It can be made rougher than the roughness. Therefore, the surface roughness of both ends of the developing sleeve 132 with a small amount of pumping can be increased to increase the amount of pumping at both ends, and the image formed by the image forming apparatus 101 having the developing sleeve 132 can be formed. Unevenness can be reliably prevented. Therefore, it is possible to reliably perform the roughening process on the outer surface of the developing sleeve 132 so that unevenness of the image can be prevented.

  Furthermore, in the present invention, as the control device 76 moves toward both ends of the workpiece 2, the moving speed of the electromagnetic coil 8 is gradually reduced as the control device 76 moves toward both ends of the workpiece 2. The moving speed of the coil 8 may be slower than the moving speed of the electromagnetic coil 8 when processing the central portion of the workpiece 2.

  In the present invention, the moving speed of the electromagnetic coil 8 when machining both ends of the workpiece 2 is not slower than the moving speed of the electromagnetic coil 8 when machining the central portion of the workpiece 2. The moving speed of the electromagnetic coil 8 when machining any part of the object 2 may be faster than the moving speed of the electromagnetic coil 8 when machining other parts of the object 2.

  Furthermore, in the present invention, as shown in FIG. 3, the outer diameter of the hollow holding member 32 near both ends in the longitudinal direction (axial direction) of the workpiece 2 and the longitudinal direction (axial direction) of the workpiece 2. The outer diameter of the hollow holding member 32 near the center may be different. In the illustrated example, the outer diameter of the hollow holding member 32 near both ends in the longitudinal direction (axial direction) of the workpiece 2 is equal to that of the hollow holding member 32 near the center in the longitudinal direction (axial direction) of the workpiece 2. It is formed larger than the outer diameter. In FIG. 3, the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this case, the strength of the rotating magnetic field at both ends of the workpiece 2 is stronger than the strength of the rotating magnetic field at the center of the workpiece 2. Then, the surface roughness of both ends of the developing sleeve 132 where the amount of pumping is small can be increased to increase the amount of pumping at both ends, and the image formed by the image forming apparatus 101 provided with the developing sleeve 132 is uneven. Can be reliably prevented. Therefore, it is possible to reliably perform the roughening process on the outer surface of the developing sleeve 132 so that unevenness of the image can be prevented.

  In the present invention, the outer diameter of the hollow holding member 32 that holds the workpiece 2 may be made different between the both end portions and the central portion of the workpiece 2. In other words, the outer diameter of both end portions of the workpiece 2 of the hollow holding member 32 may be smaller than the outer diameter of the central portion of the workpiece 2. In short, in the present invention, the outer diameter of both ends of the workpiece 2 of the hollow holding member 32 may be different from the outer diameter of the central portion of the workpiece 2. By doing so, it is possible to reliably perform the roughening process on the outer surface of the developing sleeve 132 so as to prevent the occurrence of image unevenness.

  In the case shown in FIG. 3, it is desirable to keep the moving speed of the electromagnetic coil 8 constant and to keep the power applied to the electromagnetic coil 8 constant. Further, in the case shown in FIG. 3, the electromagnetic coil 8 may be formed to have substantially the same length as the storage tank 9, and the electromagnetic coil 8 may not be moved with respect to the storage tank 9.

  The developing sleeve 132 described above constitutes the image forming apparatus 101 shown in FIG. The image forming apparatus 101 prints an image of each color of yellow (Y), magenta (M), cyan (C), and black (K), that is, a color image, as a sheet of transfer material 107 (shown in FIG. 4). ) To form. The units corresponding to the colors of yellow, magenta, cyan, and black are indicated by adding Y, M, C, and K at the end of the reference numerals.

  As shown in FIG. 4, the image forming apparatus 101 includes an apparatus main body 102, a paper feed unit 103, a registration roller pair 110, a transfer unit 104, a fixing unit 105, and a plurality of laser writing units 122Y, 122M, and 122C. , 122K and a plurality of process cartridges 106Y, 106M, 106C, 106K.

  The apparatus main body 102 is formed in a box shape, for example, and is installed on a floor or the like. The apparatus main body 102 includes a paper feed unit 103, a registration roller pair 110, a transfer unit 104, a fixing unit 105, a plurality of laser writing units 122Y, 122M, 122C, and 122K, and a plurality of process cartridges 106Y, 106M, and 106C. 106K.

  A plurality of paper feed units 103 are provided in the lower part of the apparatus main body 102. The paper feed unit 103 includes a paper feed cassette 123 that can accommodate the above-described recording paper 107 in a stacked manner and can be taken in and out of the apparatus main body 102, and a paper feed roller 124. The paper feed roller 124 is pressed against the uppermost recording paper 107 in the paper feed cassette 123. The paper feed roller 124 is used to transfer the above-described uppermost recording paper 107 between a transfer belt 129 (described later) of the transfer unit 104 and a photosensitive drum 108 of a developing device 113 (described later) of the process cartridges 106Y, 106M, 106C, and 106K. Send it in between.

  The registration roller pair 110 is provided in a conveyance path of the recording paper 107 conveyed from the paper supply unit 103 to the transfer unit 104, and includes a pair of rollers 110a and 110b. The registration roller pair 110 sandwiches the recording paper 107 between the pair of rollers 110a and 110b, and the transfer unit 104 and the process cartridges 106Y, 106M, 106C, and 106K at a timing at which the sandwiched recording paper 107 can be superimposed on the toner image. Send out in between.

  The transfer unit 104 is provided above the paper feed unit 103. The transfer unit 104 includes a driving roller 127, a driven roller 128, a conveyance belt 129, and transfer rollers 130Y, 130M, 130C, and 130K. The drive roller 127 is disposed on the downstream side in the conveyance direction of the recording paper 107 and is driven to rotate by a motor or the like as a drive source. The driven roller 128 is rotatably supported by the apparatus main body 102 and is disposed on the upstream side in the conveyance direction of the recording paper 107. The conveyor belt 129 is formed in an endless annular shape and is stretched over both the driving roller 127 and the driven roller 128 described above. The conveyance belt 129 circulates (endless travel) around the driving roller 127 and the driven roller 128 described above in the counterclockwise direction in the drawing as the driving roller 127 is rotationally driven.

  The transfer rollers 130Y, 130M, 130C, and 130K sandwich the conveyance belt 129 and the recording paper 107 on the conveyance belt 129 between the photosensitive drums 108 of the process cartridges 106Y, 106M, 106C, and 106K, respectively. In the transfer unit 104, the transfer rollers 130Y, 130M, 130C, and 130K press the recording paper 107 fed from the paper supply unit 103 against the outer surface of the photosensitive drum 108 of each process cartridge 106Y, 106M, 106C, and 106K. The toner image on the photosensitive drum 108 is transferred to the recording paper 107. The transfer unit 104 sends the recording paper 107 onto which the toner image is transferred toward the fixing unit 105.

  The fixing unit 105 is provided downstream of the transfer unit 104 in the conveyance direction of the recording paper 107, and includes a pair of rollers 105a and 105b that sandwich the recording paper 107 therebetween. The fixing unit 105 presses and heats the recording paper 107 sent out from the transfer unit 104 between the pair of rollers 105a and 105b, thereby recording the toner image transferred from the photosensitive drum 108 onto the recording paper 107. Fix to paper 107.

  The laser writing units 122Y, 122M, 122C, and 122K are attached to the upper part of the apparatus main body 102, respectively. The laser writing units 122Y, 122M, 122C, and 122K correspond to one process cartridge 106Y, 106M, 106C, and 106K, respectively. The laser writing units 122Y, 122M, 122C, and 122K irradiate laser beams onto the outer surface of the photosensitive drum 108 that is uniformly charged by a later-described charging roller 109 of the process cartridges 106Y, 106M, 106C, and 106K. An electrostatic latent image is formed.

  The process cartridges 106Y, 106M, 106C, and 106K are provided between the transfer unit 104 and the laser writing units 122Y, 122M, 122C, and 122K, respectively. The process cartridges 106Y, 106M, 106C, and 106K are detachable from the apparatus main body 102. The process cartridges 106Y, 106M, 106C, and 106K are arranged in parallel along the conveyance direction of the recording paper 107.

  As shown in FIG. 5, the process cartridges 106Y, 106M, 106C, and 106K include a cartridge case 111, a charging roller 109 as a charging device, a photosensitive drum 108 as a photosensitive member (also referred to as an image carrier), and a cleaning. A cleaning blade 112 as an apparatus and a developing device 113 are provided. Therefore, the image forming apparatus 101 includes at least a charging roller 109, a photosensitive drum 108, a cleaning blade 112, and a developing device 113.

  The cartridge case 111 is detachably attached to the apparatus main body 102 and accommodates a charging roller 109, a photosensitive drum 108, a cleaning blade 112, and a developing device 113. The charging roller 109 uniformly charges the outer surface of the photosensitive drum 108. The photosensitive drum 108 is disposed with a gap from a developing roller 115 (to be described later) of the developing device 113. The photosensitive drum 108 is formed in a columnar shape or a cylindrical shape that is rotatable around an axis. An electrostatic latent image is formed on the outer surface of the photosensitive drum 108 by the corresponding laser writing units 122Y, 122M, 122C, and 122K. The photosensitive drum 108 is developed by adsorbing toner onto an electrostatic latent image formed on and carried on the outer surface, and the toner image thus obtained is transferred to a recording paper 107 positioned between the conveyance belt 129. To do. The cleaning blade 112 removes the transfer residual toner remaining on the outer surface of the photosensitive drum 108 after the toner image is transferred to the recording paper 107.

  As shown in FIG. 5, the developing device 113 includes at least a developer supplying unit 114, a case 125, a developing roller 115 as a developer carrying member, and a regulating blade 116 as a regulating member.

  The developer supply unit 114 includes a storage tank 117 and a pair of stirring screws 118 as stirring members. The storage tank 117 is formed in a box shape having a length substantially equal to that of the photosensitive drum 108. Further, a partition wall 119 extending along the longitudinal direction of the storage tank 117 is provided in the storage tank 117. The partition wall 119 partitions the storage tank 117 into a first space 120 and a second space 121. Moreover, both ends of the first space 120 and the second space 121 communicate with each other.

  The storage tank 117 stores the developer 126 in both the first space 120 and the second space 121. The developer 126 contains toner and a magnetic carrier (also called magnetic powder, whose cross section is shown in FIG. 8) 135. The toner is appropriately supplied to one end portion of the first space 120 on the side away from the developing roller 115 in the first space 120 and the second space 121. The toner is spherical fine particles produced by an emulsion polymerization method or a suspension polymerization method. The toner may be obtained by pulverizing a lump composed of a synthetic resin in which various dyes or pigments are mixed and dispersed. The average particle diameter of the toner is 3 μm or more and 7 μm or less. The toner may be formed by pulverization or the like.

  The magnetic carrier 135 is accommodated in both the first space 120 and the second space 121. The average particle diameter of the magnetic carrier 135 is 20 μm or more and 50 μm or less. As shown in FIG. 8, the magnetic carrier 135 includes a core material 136, a resin coat film 137 covering the outer surface of the core material 136, and alumina particles 138 dispersed in the resin coat film 137. .

  The core 136 is made of ferrite as a magnetic material and is formed in a spherical shape. The resin coat film 137 covers the entire outer surface of the core material 136. The resin coat film 137 contains a resin component obtained by crosslinking a thermoplastic resin such as acrylic and a melamine resin, and a charge adjusting agent. This resin coat film 137 has elasticity and strong adhesive force. The alumina particles 138 are formed in a spherical shape whose outer diameter is larger than the thickness of the resin coat film 137. The alumina particles 138 are held with a strong adhesive force of the resin coat film 137. The alumina particles 138 protrude from the resin coat film 137 to the outer peripheral side of the magnetic carrier 135.

  The stirring screw 118 is accommodated in each of the first space 120 and the second space 121. The longitudinal direction of the stirring screw 118 is parallel to the longitudinal directions of the storage tank 117, the developing roller 115, and the photosensitive drum 108. The agitating screw 118 is provided so as to be rotatable around an axis, and rotates around the axis to agitate the toner and the magnetic carrier 135 and convey the developer 126 along the axis.

  In the illustrated example, the agitation screw 118 in the first space 120 conveys the developer 126 from one end to the other end. The agitation screw 118 in the second space 121 conveys the developer 126 from the other end toward the one end.

  According to the above-described configuration, the developer supply unit 114 conveys the toner supplied to one end of the first space 120 to the other end while stirring with the magnetic carrier 135, and the second supply from the other end. It is conveyed to the other end of the space 121. The developer supply unit 114 agitates the toner and the magnetic carrier 135 in the second space 121 and supplies the toner and the magnetic carrier 135 to the outer surface of the developing roller 115 while transporting them in the axial direction.

  The case 125 is formed in a box shape, is attached to the storage tank 117 of the developer supply unit 114 described above, and covers the developing roller 115 and the like together with the storage tank 117. In addition, an opening 125 a is provided in a portion of the case 125 that faces the photosensitive drum 108.

  The developing roller 115 is formed in a cylindrical shape, and is provided between the second space 121 and the photosensitive drum 108 and in the vicinity of the opening 125a described above. The developing roller 115 is parallel to both the photosensitive drum 108 and the storage tank 117. The developing roller 115 is disposed at a distance from the photosensitive drum 108. A space between the developing roller 115 and the photosensitive drum 108 forms a developing region 131 in which the toner of the developer 126 is attracted to the photosensitive drum 108 and the electrostatic latent image is developed to obtain a toner image. In the developing area 131, the developing roller 115 and the photosensitive drum 108 face each other.

  As shown in FIGS. 5 and 6, the developing roller 115 includes a cored bar 134, a cylindrical magnet roller (also referred to as a magnet body) 133, and the above-described cylindrical developing sleeve 132. The core metal 134 is arranged in parallel with the longitudinal direction of the photosensitive drum 108 in the longitudinal direction, and is fixed to the case 125 without rotating.

  The magnet roller 133 is made of a magnetic material, is formed in a cylindrical shape, and is attached with a plurality of fixed magnetic poles (not shown). The magnet roller 133 is fixed to the outer periphery of the core bar 134 without rotating around the axis.

  The fixed magnetic pole is a long and rod-shaped magnet, and is attached to the magnet roller 133. The fixed magnetic pole extends along the longitudinal direction of the magnet roller 133, that is, the developing roller 115, and is provided over the entire length of the magnet roller 133. The magnet roller 133 having the above-described configuration is accommodated (enclosed) in the developing sleeve 132.

  One fixed magnetic pole is opposed to the agitating screw 118 described above. The one fixed magnetic pole serves as a pumping magnetic pole, generates a magnetic force on the outer surface of the developing sleeve 132, that is, the developing roller 115, and causes the developer 126 in the second space 121 of the storage tank 117 to flow to the developing sleeve 132. Adsorb to the outer surface.

  The other fixed magnetic pole is opposed to the photosensitive drum 108 described above. The fixed magnetic pole forms a developing magnetic pole, and generates a magnetic force on the outer surface of the developing sleeve 132, that is, the developing roller 115, thereby forming a magnetic field between the developing sleeve 132 and the photosensitive drum 108. The fixed magnetic pole forms a magnetic brush by the magnetic field, so that the toner of the developer 126 adsorbed on the outer surface of the developing sleeve 132 is transferred to the photosensitive drum 108.

  At least one fixed magnetic pole is provided between the pumping magnetic pole and the developing magnetic pole. The at least one fixed magnetic pole generates a magnetic force on the outer surface of the developing sleeve 132, that is, the developing roller 115, conveys the developer 126 before development toward the photosensitive drum 108, and develops the developed developer 126. Is conveyed from the photosensitive drum 108 into the storage tank 117.

  When the developer 126 adsorbs the developer 126 to the outer surface of the developing sleeve 132, a plurality of the magnetic carriers 135 of the developer 126 overlap each other along the lines of magnetic force generated by the fixed magnetic pole. To stand up. In this manner, a state in which a plurality of magnetic carriers 135 are erected on the outer surface of the developing sleeve 132 along the lines of magnetic force is referred to as the magnetic carrier 135 rising on the outer surface of the developing sleeve 132. Then, the above-described toner is adsorbed to the magnetic carrier 135 that is raised. That is, the developing sleeve 132 attracts the developer 126 to the outer surface by the magnetic force of the magnet roller 133.

  As shown in FIG. 7, the developing sleeve 132 is formed in a cylindrical shape. The developing sleeve 132 includes (accommodates) a magnet roller 133 and is provided so as to be rotatable around the axis. The developing sleeve 132 is rotated so that the inner peripheral surface thereof is sequentially opposed to the fixed magnetic pole. The developing sleeve 132 is made of a nonmagnetic material such as an aluminum alloy or stainless steel (SUS).

  Aluminum alloys are excellent in terms of workability and lightness. When an aluminum alloy is used, it is preferable to use A6063, A5056, and A3003. When using SUS, it is preferable to use SUS303, SUS304, and SUS316.

  The regulating blade 116 is provided at the end of the developing device 113 near the photosensitive drum 108. The regulating blade 116 is attached to the case 125 described above with a space from the outer surface of the developing sleeve 132. The regulating blade 116 scrapes the developer 126 on the outer surface of the developing sleeve 132 exceeding the desired thickness into the storage tank 117, and the developer 126 on the outer surface of the developing sleeve 132 conveyed to the developing region 131. To the desired thickness.

  In the developing device 113 configured as described above, the developer and the magnetic carrier 135 are sufficiently stirred by the developer supply unit 114, and the stirred developer 126 is adsorbed to the outer surface of the developing sleeve 132 by the fixed magnetic pole. Then, the developing device 113 conveys the developer 126 adsorbed by the plurality of fixed magnetic poles toward the developing region 131 as the developing sleeve 132 rotates. The developing device 113 causes the photosensitive drum 108 to adsorb the developer 126 having a desired thickness by the regulating blade 116. In this way, the developing device 113 carries the developer 126 on the developing roller 115, conveys it to the developing area 131, and develops the electrostatic latent image on the photosensitive drum 108 to form a toner image.

  Then, the developing device 113 causes the developed developer 126 to be released toward the storage tank 117. Further, the developed developer 126 stored in the storage tank 117 is sufficiently stirred again with the other developer 126 in the second space 121, and the electrostatic latent image on the photosensitive drum 108 is recovered. Used for development.

  The image forming apparatus 101 having the above-described configuration forms an image on the recording paper 107 as described below. First, the image forming apparatus 101 rotates the photosensitive drum 108 and uniformly charges the outer surface of the photosensitive drum 108 by the charging roller 109. Laser light is irradiated on the outer surface of the photosensitive drum 108 to form an electrostatic latent image on the outer surface of the photosensitive drum 108. When the electrostatic latent image is positioned in the developing area 131, the developer 126 adsorbed on the outer surface of the developing sleeve 132 of the developing device 113 is adsorbed on the outer surface of the photosensitive drum 108, and the electrostatic latent image is developed. Then, a toner image is formed on the outer surface of the photosensitive drum 108.

  In the image forming apparatus 101, the recording paper 107 conveyed by the paper supply roller 124 of the paper supply unit 103 is transferred to the photosensitive drum 108 of the process cartridges 106Y, 106M, 106C, and 106K and the conveyance belt 129 of the transfer unit 104. The toner image formed on the outer surface of the photosensitive drum 108 is transferred to the recording paper 107. The image forming apparatus 101 uses a fixing unit 105 to fix the toner image on the recording paper 107. Thus, the image forming apparatus 101 forms a color image on the recording paper 107.

  According to the image forming apparatus 101 described above, since the developer 126 having an average particle diameter of the magnetic carrier 135 of 20 μm or more and 50 μm or less is used, an excellent image with excellent granularity and less unevenness can be obtained. . If the average particle size of the magnetic carrier 135 is less than 20 μm, the magnitude of the magnetization of each magnetic carrier 135 becomes small, so the magnetic binding force of the magnetic carrier 135 from the developing roller 115 becomes weak, and the magnetic carrier 135 Since the carrier 135 is easily attracted to the photosensitive drum 108, it is not desirable. If the average particle diameter of the magnetic carrier 135 exceeds 50 μm, the electric field between the magnetic carrier 135 and the electrostatic latent image on the photosensitive drum 108 becomes sparse, and a uniform image cannot be obtained (the image quality deteriorates). Therefore, it is not desirable.

  Further, since the distance between the developing sleeve 132 and the photosensitive drum 108 is 0.1 mm or more and 0.4 mm or less, the toner is reliably supplied to the photosensitive drum 108 from the developer 126 that stands on the developing sleeve 132. And high-quality images can be obtained. If the distance between the developing sleeve 132 and the photosensitive drum 108 is less than 0.1 mm, the electric field between the developing sleeve 132 and the photosensitive drum 108 becomes too strong, and the magnetic carrier 135 is formed on the photosensitive drum 108. It moves and is not desirable. If the distance between the developing sleeve 132 and the photosensitive drum 108 exceeds 0.4 mm, the electric field between the developing sleeve 132 and the photosensitive drum 108 becomes too weak, and the amount of toner that can be supplied to the photosensitive drum 108 is small. Development is not desirable because the development efficiency decreases and the edge effect of the electric field increases at the edge of the image and a uniform image cannot be obtained.

  Further, a developer 126 having a magnetic carrier 135 in which the surface of the core 136 is coated with a resin coat film 137 in which a charge adjusting agent is contained in a resin component obtained by crosslinking a thermoplastic resin and a melamine resin is used. As described above, since the magnetic carrier 135 in which the core material 136 is coated with the resin coat film 137 having elasticity is used, the resin coat film 137 has elasticity, so that the shock is absorbed and the magnetic carrier 135 is scraped. To prevent it. For this reason, it is possible to achieve a longer life than conventional magnetic carriers.

  Further, alumina particles 138 larger than the thickness of the resin coat film 137 are dispersed in the resin coat film 137 described above. Thus, the developer 126 having the magnetic carrier 135 provided with the alumina particles 138 protruding from the outer surface of the resin coat film 137 is used. For this reason, the alumina particles 138 can prevent the resin coating film 137 from colliding and can clean the spent material.

  Therefore, since the resin coating film 137 can be prevented from being scraped, the life can be further prolonged as compared with the conventional magnetic carrier. Therefore, it is possible to obtain a stabilization rule of the pumping amount of toner, that is, high image quality over a long period of time.

  Since the toner is selected to be based on the emulsion polymerization method or suspension polymerization method, since the sphericity of the toner is good, there is an effect that the density unevenness remaining on the image is visually improved.

  In addition, since the developing device 113 described above is included, it is possible to provide the process cartridges 106Y, 106M, 106C, and 106K and the image forming apparatus 101 that can obtain high-quality images over a long period of time.

  In the image forming apparatus 101 described above, the process cartridges 106Y, 106M, 106C, and 106K include a cartridge case 111, a charging roller 109, a photosensitive drum 108, a cleaning blade 112, and a developing device 113. However, in the present invention, the process cartridges 106Y, 106M, 106C, and 106K need only include at least the developing device 113, and do not necessarily include the cartridge case 111, the charging roller 109, the photosensitive drum 108, and the cleaning blade 112. . In the above-described embodiment, the image forming apparatus 101 includes the process cartridges 106Y, 106M, 106C, and 106K that are detachable from the apparatus main body 102. However, in the present invention, the image forming apparatus 101 only needs to include the developing device 113 and does not necessarily include the process cartridges 106Y, 106M, 106C, and 106K.

  In the above-described embodiment, it goes without saying that the outer diameter of the workpiece 2, the size of the magnetic abrasive grains 65, and the outer diameter of the cylindrical member 50 of the storage tank 9 may be appropriately changed. In addition, regarding the shapes of both ends of the workpiece 2, the rough surface roughness, the processing time (processing conditions), the number of reciprocations of the electromagnetic coil 8, and the magnetism are also targeted, such as the radius of curvature of chamfering and the size of the chamfered shape. It is desirable to select an appropriate shape from the durability of the abrasive grains 65. The total amount of the magnetic abrasive grains 65 accommodated in the accommodating tank 9 is also appropriate from the target roughness of the rough surface, the processing time (processing conditions), the number of reciprocations of the electromagnetic coil 8, and the durability of the magnetic abrasive grains 65. It is desirable that the amount be determined in a proper amount.

  In the embodiment described above, the partition member 55 is provided. However, in the present invention, due to the mass of the magnetic abrasive grains 65 and the strength of the rotating magnetic field generated by the electromagnetic coil 8, the magnetic abrasive grains 65 are not attracted to the rotating magnetic field, and the magnetic abrasive is moved by the electromagnetic coil 8. As long as the grains 65 escape from the rotating magnetic field, the partition member 55 need not be provided. Furthermore, in the present invention, the sealing plate 56 may be provided at at least one end of the cylindrical member 50 of the storage tank 9. In the present invention, the outer surface of the workpiece 2 having various shapes other than a cylindrical shape such as a plate shape may be roughened.

  Furthermore, in the above-described embodiment, development is performed by changing the strength of the rotating magnetic field generated by the electromagnetic coil 8, changing the moving speed of the electromagnetic coil 8, or changing the outer diameter of the hollow holding member 32. The surface roughness of the outer surface of the sleeve 132 is appropriately changed. However, in the present invention, in order to make the surface roughness of the outer surface of the developing sleeve 132 uniform in the longitudinal direction of the developing sleeve 132, the strength of the rotating magnetic field generated by the electromagnetic coil 8 can be changed, The moving speed of the electromagnetic coil 8 may be changed, or the outer diameter of the hollow holding member 32 may be changed.

  The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the scope of the present invention. That is, the holding unit, the rotating unit, and the magnetic field changing unit are not limited to the configurations and arrangements described in the embodiments, and may be various configurations and arrangements.

1 is a perspective view showing a schematic configuration of a surface treatment apparatus according to an embodiment of the present invention. It is sectional drawing which follows the II-II line | wire in FIG. It is sectional drawing which shows the modification of the surface treatment apparatus shown by FIG. FIG. 2 is an explanatory diagram viewed from the front of a configuration of an image forming apparatus including a developing sleeve obtained by the surface treatment apparatus illustrated in FIG. 1. FIG. 5 is a cross-sectional view of a process cartridge of the image forming apparatus shown in FIG. 4. It is sectional drawing which follows the VV line | wire in FIG. FIG. 7 is a perspective view of a developing sleeve of the developing device shown in FIG. 6. It is sectional drawing of the magnetic carrier of the developing agent of the image development apparatus shown by FIG.

DESCRIPTION OF SYMBOLS 1 Surface treatment apparatus 2 Processing object 5 Electromagnetic coil moving part (moving means)
8 Electromagnetic coil (magnetic field generator)
9 Storage tank 32 Hollow holding member (core shaft, holding means)
33 Drive motor (rotating means)
34 Cylinders 40 chucking pawl 49 inverter chuck (magnetic field changing means)
65 Magnetic abrasive grains 75 Linear encoder (detection means)
76 Control device (control means)

Claims (8)

A storage tank for storing the workpiece and magnetic abrasive grains, and a magnetic field for generating a rotating magnetic field for moving the magnetic abrasive grains in the storage tank and causing the magnetic abrasive grains to collide with the processing object by the rotating magnetic field. in the surface treatment apparatus provided with a generating unit, a,
Moving means for moving the magnetic field generator along the longitudinal direction of the storage tank;
Detecting means for detecting a relative position of the magnetic field generation unit with respect to the storage tank;
And a magnetic field changing means for changing the intensity of the magnetic field the Ru generated by the magnetic field generating unit,
And control means on the basis of the relative position, to change the intensity of the magnetic field the Ru generated by the magnetic field generating unit to a magnetic field changing means for said storage tank of the magnetic field generating unit which is detected by said detecting means,
Surface treatment apparatus characterized by comprising a. The surface according to claim 1, wherein the control unit is configured to cause the magnetic field changing unit to change the strength of the magnetic field generated by the magnetic field generation unit according to a predetermined pattern. Processing equipment. The rotating magnetic field generated by the magnetic field generation unit when the control unit processes both ends in the longitudinal direction of the processing object is the magnetic field generation unit when processing the central part in the longitudinal direction of the processing object. as stronger than the rotational magnetic field generation, surface treatment according to claim 2, characterized in that it is configured to change the intensity of the magnetic field generated by the magnetic field generating unit before Symbol field changing means apparatus. A storage tank for storing the workpiece and magnetic abrasive grains, and a magnetic field for generating a rotating magnetic field for moving the magnetic abrasive grains in the storage tank and causing the magnetic abrasive grains to collide with the processing object by the rotating magnetic field. in the surface treatment apparatus provided with a generating unit, a,
Moving means for moving the magnetic field generator along the longitudinal direction of the storage tank;
Detecting means for detecting a relative position of the magnetic field generation unit with respect to the storage tank;
And control means on the basis of the relative position, to change the speed of moving the magnetic field generating unit to said moving means for said storage tank of the magnetic field generating unit which is detected by said detecting means,
Surface treatment apparatus characterized by comprising a. The surface treatment apparatus according to claim 4, wherein the control unit is configured to cause the moving unit to change a moving speed of the magnetic field generation unit according to a predetermined pattern. The speed of movement of the magnetic field generation unit when the control unit processes both ends in the longitudinal direction of the workpiece is determined by the speed of the magnetic field generation unit when processing the central portion in the longitudinal direction of the workpiece. as slower than the speed of moving, pre-SL surface treatment apparatus according to claim 5, characterized in that it is configured such that the changing the moving speed of the magnetic field generating unit to the mobile unit. Surface treatment apparatus as claimed in any one of claims 1 to 6, characterized in that it comprises a partition means for partitioning a space of the storage tub along the longitudinal direction of the container tank. Surface treatment apparatus as claimed in any one of claims 1 to 7, characterized in that it comprises a holding means for holding the workpiece in the center of the storage tank.

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