Belt processing device

Abstract

A belt processing apparatus (10) that relatively moves a processing belt (34) with respect to a work (W) and processes the work is equipped with: a first roller (40) as a processing roller; a second roller (32) as a driven roller; a processing belt supported by the first roller and the second roller; an air pressure motor (60) that rotates the first roller or the second roller; an elastic ring (44) mounted to an outer periphery of the first roller; and an expansion preventing member (46) mounted to the elastic ring and having an elastic rate greater than an elastic rate of the elastic ring.

Description

TECHNICAL FIELD

[0001] The present application relates to a belt processing device that processes a workpiece surface using an endless processing belt stretched between a plurality of rollers. BACKGROUND

[0002] For example, on a surface of a mold for plastic injection molding, a precise sealing surface provided in a vacuum chamber, or the like, in order to meet functional requirements or improve the appearance, polishing processing is generally performed after cutting processing. In order to perform such polishing processing using an existing machine tool, a belt polishing tool capable of being attached to a spindle of the machine tool is sometimes used.

[0003] In Patent Literature 1, a belt polishing tool is described that is equipped with: a main body portion; a holding portion that is joined to the main body portion; a power generation portion; an endless polishing belt; a drive roller that rotatably supports the polishing belt and transmits rotational power received from the power generation portion to the polishing belt; a first driven roller that rotatably supports the polishing belt; and a processing roller as a second driven roller that rotatably supports the polishing belt and supports a portion of the polishing belt that contacts a workpiece at the time of polishing.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2020-163552 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the belt polishing tool of Patent Literature 1, the posture of the polishing belt is made to follow the shape change of the processing surface (polished surface) by rotatably supporting the processing roller about an axis of rotation that is orthogonal to the axis of rotation of the processing roller, but in some cases, polishing cannot be performed on the entire surface in the width direction of the polishing belt due to poor alignment of the processing roller. In addition, even in the case of a workpiece on which planar processing has been performed, polishing omission of the belt can occur on the processing surface due to the alignment of the workpiece. It is not possible to form a program that causes the processing belt to move in accordance with the minute undulations of the processing surface in all cases.

[0009] The present application takes as a technical problem the resolution of such problems of the related art, and aims to provide a belt processing device that does not require an additional complex structure, and that can efficiently obtain a good processing surface (polished surface) by simply providing a general processing belt.

[0010] MEANS FOR SOLVING THE PROBLEM

[0011] To achieve the above objectives, according to the present invention, a belt processing apparatus is provided, which processes a workpiece by moving a processing belt relative to the workpiece. The belt processing apparatus is equipped with: a first roller as a processing roller; a second roller; a processing belt supported by the first roller and the second roller; a rotational power generator that rotates either the first roller or the second roller; an annular elastic body mounted on the outer periphery of the first roller; and an annular expansion prevention member mounted on the elastic body, wherein the elastic modulus of the expansion prevention member is greater than that of the elastic body.

[0012] The effects of the invention

[0013] According to the present invention, by mounting an elastomer on the surface of the processing roller, the elastomer absorbs the alignment of the processing roller, the mounting alignment of the workpiece, the step difference of the seam of the processing belt, or the undulation shape of the workpiece's processing surface during processing (including grinding), thereby obtaining a good processing surface. Furthermore, an expansion prevention member is used to prevent the elastomer from expanding and deforming in the radial direction due to centrifugal force during the rotation of the processing roller. Attached Figure Description

[0014] Figure 1 This is a side view of an example of a machine tool with a processing device that can be mounted according to the present invention.

[0015] Figure 2 This is a side view of a processing device according to an embodiment of the present invention.

[0016] Figure 3 yes Figure 2 A three-dimensional view of the processing equipment.

[0017] Figure 4 yes Figure 2 A cross-sectional view of the processing equipment.

[0018] Figure 5 This is a cross-sectional view of the first roller according to one embodiment.

[0019] Figure 6 This is a cross-sectional view of the elastic ring.

[0020] Figure 7 This is a cross-sectional view showing a modified example of the first roller. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] Figure 1 This is a side view showing the working machine 100 as a general vertical machining center and the belt machining device 10 mounted thereon according to an embodiment of the present invention.Figure 1 The machine tool 100 includes: a base 102, which is a platform fixed to the factory floor; and a worktable 104, which can be operated in the Y-axis direction or the front-rear direction. Figure 1 The workpiece W is fixed on the upper surface of the worktable 104 by being movable in the left-right direction (in the left-right direction); a column 108 is erected vertically from the upper surface at the rear part of the worktable 102; an X-axis slider 110 is movable in the X-axis direction or the left-right direction (in the left-right direction). Figure 1 The spindle head 112 is movably disposed on the front surface of the column 108 in the direction perpendicular to the paper plane; the spindle head 112 is movably disposed on the front surface of the X-axis slider 110 in the Z-axis direction or in the up and down direction relative to the X-axis slider 110, and can rotatably support the spindle 114 with the vertical rotation axis O as the center.

[0023] Additionally, the machine tool 100 includes an X-axis feed device (not shown) for reciprocating the X-axis slider 110 in the X-axis direction, a Y-axis feed device (not shown) for reciprocating the table 104 in the Y-axis direction, and a Z-axis feed device (not shown) for reciprocating the spindle head 112 in the Z-axis direction. The machine tool 100 also includes a spindle motor (not shown) for rotary driving the spindle 114. The spindle motor can be disposed outside or inside the housing (not shown) of the spindle head 112. Preferably, the spindle motor can use its torque to hold the spindle 114 at a predetermined angular position about the rotation axis O. The machine tool 100 also includes a NC device (not shown) for orthogonally controlling the feed devices of the spindle motor and the three orthogonal axes (X-axis, Y-axis, and Z-axis).

[0024] Preferably, the machine tool 100 also includes an automatic tool changing device (not shown) for changing a tool (not shown) mounted on the end of the spindle 114. Thus, the machine tool 100 forms a vertical machining center, where the spindle 114 can move and be positioned relative to the workpiece W along the three orthogonal axes of X, Y, and Z, and can be positioned at an angular position about the rotation axis O.

[0025] At the end of the spindle 114 of the machine tool 100, a tapered hole (not shown in the figure) is formed for mounting a tool (not shown in the figure). Additionally, a center hole (not shown in the figure) is formed through the spindle 114 along the axis of rotation O. A lever-type (not shown in the figure) tool clamping device is disposed in the center hole of the spindle 114, which secures the tool mounted in the tapered hole. In this embodiment, the tool clamping device is configured to secure a double-sided constrained HSK-type clamp into the tapered hole of the spindle 114.

[0026] The machining device 10 is installed in the tapered hole of the spindle 114 of the machine tool 100. For example... Figures 2-4 As shown, the machining device 10 has a main body 20 and a retaining part 12, which fits into a tapered hole in the spindle 114 of the machine tool 100. The tapered hole can be a tapered hole for mounting a tool holder (not shown) based on HSK standard (DIN69893). The tapered hole can also fit into other shank-shaped, such as a 7 / 24 taper shank-shaped tapered portion.

[0027] The retaining portion 12 includes: a tapered portion 14 capable of close contact with the inner circumferential surface of the tapered bore of the spindle 114 of the machine tool 100; a cylindrical extension portion 16 engaged with the main body portion 20; and a flange portion 18 located between the extension portion 16 and the retaining portion 12. A V-groove 18a extending circumferentially is formed in the flange portion 18, which is configured to engage with a changing arm (not shown) of an automatic tool changing device attached to the machine tool 100. In this embodiment, the retaining portion 12, particularly the tapered arm 14, and the flange portion 18 are formed based on HSK specifications (DIN69893). Regarding the retaining portion 12, as... Figure 4 As shown, commercially available tool holders based on HSK specifications (DIN69893) can also be used. In this case, a center hole 12a and a tool mounting hole 16a can be formed inside the retaining part 12 along the central axis O1.

[0028] When the retaining part 12 has a shape based on HSK standard (DIN69893), in order to clamp the retaining part 12 into the tapered hole of the spindle 114, the hollow spindle 114 is provided with a clamping device, which is equipped with: a pull rod (not shown) extending along the axis of rotation O in the hollow internal space of the spindle; a plurality of collets (not shown) arranged at equal angular intervals in the circumferential direction with the pull rod as the center in the tapered hole; and a plurality of disc springs (not shown) arranged with the pull rod as the center in the internal space of the spindle.

[0029] The clamping device's lever is a hollow component, forming an internal fluid passage for the flow of a gas such as pressurized air or a liquid such as a cooling medium. This fluid passage is connected to a fluid source (not shown in the figure). When the supplied fluid is pressurized air, the fluid source may include a compressor (not shown in the figure) for compressing air, a container for storing pressurized air (not shown in the figure), and a pressure regulating valve (not shown in the figure) located at the container's outlet to adjust the pressure of the supplied pressurized air to a specified pressure. When the supplied fluid is a liquid such as a cooling medium, the fluid source may include a pump (not shown in the figure) for pressurizing the liquid, and a pressure regulating valve (not shown in the figure) located at the pump's outlet to adjust the pressure of the supplied liquid to a specified pressure. As the fluid source, a service air system of the plant where the machine tool 100 is installed, or a cooling medium supply device (not shown in the figure) attached to the machine tool 100 can be used.

[0030] The main body 20 includes a belt drive unit 30, a rotational power generator 60, and a power transmission unit 70 as key structural elements. The belt drive unit 30, the rotational power generator 60, and the power transmission unit 70 are mounted on a frame 22. The frame 22 has at least a base 24 and sidewalls 26 extending vertically from the base 24. The sidewalls 26, when... Figure 1 As shown, when the machining device 10 is installed at the end of the spindle 114 of the machine tool 100, it extends toward the worktable 104 and the workpiece W fixed to the worktable 104. In this embodiment, the base 24 and the side wall 26 are independent components that are fastened together by bolts 24a; however, the base 24 and the side wall 26 may also be formed integrally.

[0031] When a commercially available tool holder is used as the retaining part 12, the main body 20 of the machining device 10 is equipped with a connecting part 28 that is joined to the frame 22. The connecting part 28 protrudes from the upper surface of the base 24 toward the side opposite to the side wall 26. In this embodiment, the connecting part 28 is fastened to the base 24 by a plurality of bolts 24b. When a commercially available tool holder is not used as the retaining part 12, the extension 16 of the retaining part 12 can be joined to the base 24 by fastening measures such as bolts.

[0032] The engaging portion 28 has an engaging portion 28a that fits into the tool mounting hole 16a of the retaining portion 12, and a flange portion 28b integrally joined to the lower end of the engaging portion 28a, and a central hole 28c extending along the central axis O2 is formed. When the engaging portion 28a is engaged into the tool mounting hole 16a of the retaining portion 12, the central axis O1 of the retaining portion 12 coincides with the central axis O2 of the engaging portion 28. Figure 4In this embodiment, the retaining portion 12 and the engaging portion 28 are formed by independent components, and the central hole 12a of the retaining portion 12 is formed to open toward the tool mounting hole 16a. In this embodiment, when the engaging portion 28a is engaged into the tool mounting hole 16a of the retaining portion 12, the central hole 12a of the retaining portion 12 communicates with the central hole 28c of the engaging portion 28, forming a fluid supply passage.

[0033] When the retaining portion 12 and the connecting portion 28 are integrally formed, the central hole 12a of the retaining portion 12 is formed to extend through the retaining portion 12 along the central axis O1. In this case, the central hole 12a of the retaining portion 12 forms a fluid supply passage. When the retaining portion 12 is clamped in the tapered hole of the spindle 114, this fluid supply passage communicates with a fluid passage formed in the pull rod of the clamping device.

[0034] A belt drive unit 30 is mounted on the side wall portion 26 of the frame 22. The belt drive unit 30 has a first roller 40 and a second roller 32, and a processing belt 34 is stretched between the first roller 40 and the second roller 32. The two ends of a substrate such as a cloth to which abrasive material is bonded are joined together to form the processing belt 34 into a ring shape. The grit size of the bonded abrasive material is appropriately determined according to the surface roughness required for the grinding or lapping process to be performed.

[0035] The first roller 40 is rotatably supported on the side wall portion 26 and the bracket 36 mounted on the side wall portion 26. More specifically, the first roller 40 is mounted on the rotating shaft 38 by means of bearings 36a and 36b, the rotating shaft 38 being rotatably supported on the side wall portion 26 and the bracket 36. A key 38a is disposed between the first roller 40 and the rotating shaft 38, the key 38a engaging with the inner circumferential surface of the first roller 40 and the outer circumferential surface of the rotating shaft 38, allowing the first roller 40 to remain stationary relative to the rotating shaft 38. When the first roller 40 is mounted on the side wall portion 26 and the bracket 36, the outer circumferential surface of the first roller 40 protrudes beyond the side wall portion 26 in the direction of the central axis O1.

[0036] The first roller 40 includes a cylindrical roller body 42, at least one elastic ring 44 as an elastic body fitted to the outer peripheral surface of the roller body 42, and an end plate 48. The roller body 42 has a central hole 42a passing through the rotation shaft 38. An axially extending groove 42b for the key 38a to pass through can be formed on the inner peripheral surface of the roller body 42. At one end of the roller body 42, a radially projecting flange portion 42c is provided to prevent the elastic ring 44 from disengaging. At the other end of the roller body 42, a recess 42d for receiving the end plate 48 is formed.

[0037] The elastic ring 44 is a ring-shaped member formed of an elastic material such as foamed rubber or fluororubber sponge, which is mounted on the outer peripheral surface of the roller body 42. The elastic ring 44 has a slit 44a extending in the circumferential direction and an inner peripheral surface 44b that is in close contact with the outer peripheral surface of the roller body 42. The slit 44a is formed from the outer peripheral surface of the elastic ring 44 at a predetermined depth in the radial direction and at a predetermined width (axial dimension) in the axial direction. The slit 44a may also be a simple cut that cuts into the outer peripheral surface at a predetermined depth in the radial direction.

[0038] An expansion-prevention member 46 is embedded in the slit 44a. This member prevents the elastic ring 44 from expanding and deforming radially due to the centrifugal force generated by the rotation of the first roller 40. The expansion-prevention member 46 can be a ring-shaped member made of a material with an elastic modulus greater than that of the elastic ring 44, which is an elastic body, such as a thin resin sheet. Alternatively, the expansion-prevention member 46 can be two arc-shaped members dividing the aforementioned ring-shaped member in half along its diameter, or three arc-shaped members dividing it into three parts with a central angle of 120°. Furthermore, since the expansion-prevention member 46 can adversely affect the tensioning of the processing belt 34 when in contact with it, it is preferable that the outer diameter of the expansion-prevention member 46 is smaller than the outer diameter of the elastic ring 44, both during and without processing.

[0039] The end plate 48 has a cylindrical main body portion 48a and a flange portion 48b protruding radially from one end of the main body portion 48a. The end plate 48 has a central hole 48c passing through the rotating shaft 38. When the end plate 48 is fitted into the recess 42d of the roller body 42, the elastic ring 44 fitted into the outer peripheral surface of the roller body 42 is clamped between the flange portion 42c of the roller body 42 and the flange portion 48b of the end plate 48. This prevents the elastic ring 44 from moving axially relative to the roller body 42 and disengaging.

[0040] The second roller 32 is mounted on a rotating shaft 52, which is rotatably supported on a U-shaped bracket 50. The bracket 50 is movably positioned along a guide 59 in the direction indicated by arrow A. A stud 54 is fixed to a bracket 36 and inserted with a gap into a hole (not shown) in the bracket 50. A helical spring 56 is arranged around the stud 54. The bracket 50 is loaded by the helical spring 56 in a direction away from the bracket 36. The bracket 50 can be fixed by a pin 58, which serves as a fixing mechanism, at any distance away from the bracket 36. Specifically, the pin 58 is formed to be threaded through the bracket 50 and the end of the pin 58 abuts against the outer periphery of the stud 54 inserted into the bracket 50, thereby fixing the position of the bracket 50 when the pin 58 is rotated. In the process of changing the processing belt, when removing the processing belt, firstly, release the pin 58, allowing the bracket 50 to approach the support 36 along the guide 59. After fixing the pin 58 and releasing the tension of the processing belt 34, the processing belt 34 can be removed from the first roller 40 and the second roller 32. Alternatively, when installing the processing belt 34, with the aforementioned processing belt 34 removed, install the new processing belt 34 onto the first roller 40 and the second roller 32. When the pin 58 is released, the elastic force of the coil spring 56 causes the bracket 50 to separate from the support 36, putting the processing belt 34 into a tensioned state. Then, the pin 58 is used to fix the position of the bracket 50, thus completing the installation of the processing belt 34. With these structures and operating steps, belt replacement can be performed regardless of the operator's skill level, and the tension of the processing belt 34 can be set.

[0041] The rotary power generating unit 60 includes a rotary motor. The rotary motor can be an electric motor, but a fluid motor is preferred, particularly a pneumatic motor equipped with a turbine (not shown). The pneumatic motor of the rotary power generating unit 60 includes a turbine housing 62, which forms a chamber 64 capable of rotatably housing the turbine, and a fluid inlet 66 communicating with the chamber 64. The fluid inlet 66 communicates with a fluid supply passage. In this embodiment, the fluid inlet 66 communicates with the central holes 12a and 28c of the retaining portion 12 and the connecting portion 28.

[0042] The power transmission unit 70 includes a first pulley 72, a second pulley 74, a drive belt 76 tensioned between the first pulley 72 and the second pulley 74, and a tensioner 78. The first pulley 72 is mounted on an output shaft 68 to rotate together with the output shaft 68 of the pneumatic motor, which serves as the rotational power generator 60; the first pulley 72 forms an input pulley. The second pulley 74 is mounted on a rotating shaft 38 to rotate together with the rotating shaft 38 for the first roller 40. The drive belt 76 can be a toothed belt or a toothed belt. In the case of a toothed belt or a toothed belt, the first pulley 72 and the second pulley 74 are formed by toothed pulleys having multiple teeth that mesh with the teeth of the drive belt 76. The drive belt 76 is subjected to a certain tension between the first pulley 72 and the second pulley 74 by the tensioner 78, which has a movable roller 78a that engages with the back of the drive belt 76.

[0043] When the tool clamping device 10 is clamped into the tapered hole of the spindle 114 of the machine tool 100, the fluid supply passages 12a and 28c are connected to the fluid passages of the clamping device's pull rod. Fluid from a fluid supply source, such as pressurized air or cooling medium, is supplied to the machine chamber 64 through the fluid passages of the tool clamping device's pull rod on the spindle, the fluid supply passages 12a and 28c of the tool clamping device 10, and the fluid inlet 66 of the fluid motor, which serves as the rotary power generator 60, causing the turbine disposed within the machine chamber 64 to rotate.

[0044] The rotation is transmitted to the rotating shaft 38 via a first pulley 72, a drive belt 76, and a second pulley 74 mounted on the output shaft 68 of the fluid motor. This causes the first roller 40, acting as a pressure roller, to rotate, driving the processing belt 34 stretched between the first roller 40 and the second roller 32. During this period, the first roller 40 functions as the drive roller, and the second roller 32 functions as the driven roller. Thus, during the period when the processing belt 34 is driven and circulates between the first roller 40 and the second roller 32, the first roller 40 is pressed against the surface of the workpiece W, sandwiching the processing belt 34 between the first roller 40 and the workpiece W, causing the spindle 114 to move relative to the worktable 104, thereby processing (grinding or abrasioning) the surface of the workpiece W.

[0045] By arranging an elastic ring 44, which serves as an elastic body, on the outer periphery of the first roller 40 (which acts as a processing roller), problems such as misalignment of the processing roller during processing or unevenness of the workpiece surface can be absorbed. Without generating a special program, a good machining surface can be obtained simply by moving the belt processing device along the surface to be machined on the workpiece W according to a processing program (NC program) consistent with the design shape. Furthermore, an expansion prevention member 46 is embedded in the elastic ring 44 to prevent the elastic ring 44 from expanding or deforming in the radial direction due to centrifugal force during the rotation of the first roller 40. In other words, the expansion prevention member 46 can solve the problems of applying undesirable tension to the processing belt 34 and adversely affecting the processing of the workpiece W, and the problem of the elastic ring 44 expanding at the part not engaged with the processing belt 34 and interfering with various parts of the main body 20.

[0046] In the above embodiments, the expansion prevention member 46 is, for example, an annular member, two bow-shaped members, or three bow-shaped members made of a resin sheet disposed within the slit 44a. The slit 44a is formed from each outer peripheral surface of the elastic ring 44 with a predetermined depth in the radial direction and a predetermined width (axial dimension) in the axial direction, and extends circumferentially. However, the present invention is not limited to this. In the present invention, the expansion prevention member only needs to be able to prevent the elastomer disposed on the outer periphery of the processing roller from expanding and deforming in the radial direction due to centrifugal force during the rotation of the processing roller.

[0047] exist Figure 7 The first roller 120 is shown as a modified example of a processing roller. The first roller 120 of this embodiment is constructed in a substantially the same manner as the first roller 40 in the above embodiment, except that the elastic ring, which is an elastic body, and the expansion prevention member, which are different from the expansion prevention member 46 in the above embodiment.

[0048] exist Figure 7 In the elastic ring 124, there is a slit 124a extending in the circumferential direction. The slit 124a is formed in the axial direction of the elastic ring 124 from two opposite sides with a predetermined depth and a predetermined width (radial dimension) in the radial direction. Expansion prevention members 126a and 126b are embedded in the slit 124a to prevent the elastic ring 124 from expanding and deforming in the radial direction due to the centrifugal force caused by the rotation of the first roller 120.

[0049] The expansion prevention members 126a and 126b can be, for example, annular members made of a thin resin sheet. Alternatively, the expansion prevention members 126a and 126b can also be two arcuate members that divide the aforementioned annular member in half along its diameter, or three arcuate members that divide it into three parts with a central angle of 120°. The expansion prevention member 126a is disposed in the slit 128d of the flange portion 128b of the end plate 128, and in the slit 124a formed on the side of the elastic ring 124 facing the slit 128d. The expansion prevention member 126b is disposed in the slit 124a on the side of the two elastic rings 124 facing each other. The expansion prevention member 126c is disposed in the slit 122e of the flange portion 122c of the roller body 122, and in the slit 124a on the side of the elastic ring 124 facing the slit 122e.

[0050] Figure 7 The first roller 120 also functions in the same way as the first roller 40 in the above embodiment.

[0051] Since the spindle 114 can move and position relative to the workpiece W along the three orthogonal axes of X, Y, and Z, and can also position itself at an angle around the axis of rotation O, the workpiece W can be machined using the machine tool 100 and the belt machining device 10. This allows for the formation of a grinding or grinding finish surface with grinding or shaving marks parallel to a suitable tool feed direction on a precision sealing surface located in a vacuum chamber or similar space. Furthermore, because the machine tool 100 has a tool changing device, machining processes other than grinding or shaving performed using the belt machining device 10 can be integrated into the machining processes performed using the machine tool 100. Moreover, by using a fluid motor or a pneumatic motor as the rotary motor, the belt machining device 10 can be driven using a fluid supply source, such as a cooling medium or pressurized air, which is already provided in the machine tool 100 for lubrication or cooling. Therefore, there is no need to provide a new drive source for the belt machining device 10.

[0052] The above describes an implementation where one or two expansion prevention components are assembled in an elastic ring. However, if it is desired to more effectively prevent the expansion of the elastic ring caused by centrifugal force, a structure with more expansion prevention components can be made as needed.

[0053] Explanation of reference numerals in the attached figures

[0054] 10-belt processing device

[0055] 12 Maintenance Section

[0056] 20 main body sections

[0057] 30 with drive unit

[0058] 32 Second Roller

[0059] 34 processing belt

[0060] 40 First Roller

[0061] 44 elastic ring

[0062] 46 Expansion Prevention Components

[0063] 58.com

[0064] 60 Rotary Power Generator

[0065] 70 Power Transmission Section

[0066] 100 working machines

Claims

1. A belt processing apparatus, wherein the belt processing apparatus moves a processing belt relative to a workpiece to process the workpiece, characterized in that, Equipped with: As the first roller in the processing rollers; Second roller; A processing belt, which is supported by the first roller and the second roller; A rotational power generator that causes the first roller or the second roller to rotate; An annular elastomer, the elastomer being mounted on the outer periphery of the first roller, having a slit formed from the outer peripheral surface at a predetermined depth; as well as An annular expansion prevention member is embedded in a slit of the elastomer. The expansion prevention member has a higher elastic modulus than the elastomer and has an outer diameter smaller than the outer diameter of the elastomer, both during and without processing.

2. The belt processing apparatus as described in claim 1, wherein the portion of the processing belt engaged with the first roller contacts the surface of the workpiece, thereby processing the surface of the workpiece.

3. The processing apparatus as described in claim 1 or 2, wherein the rotary power generating unit has a fluid motor.

4. The processing device as described in claim 3, wherein the fluid motor is an air compressor motor.

5. The machining apparatus as claimed in claim 1, further comprising a retaining portion capable of being mounted to the end portion of a spindle of a working machine, the working machine comprising: the spindle; a worktable disposed facing the spindle for fixing a workpiece; and a feed device for moving the spindle relative to the worktable.

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