Abstract:
An end face polishing apparatus comprises a polishing board and a jig board for supporting workpieces. A polishing member is detachably arranged on the polishing board and has a polishing film for polishing end faces of the workpieces while the workpieces are supported by the jig board. A first holding device holdings unused polishing members each having a new polishing film preliminarily attached thereto. At least one second holding device holds used polishing members which have been removed from the polishing board. A polishing member exchanging device is mounted for linear movement in horizontal and vertical directions for exchanging a used polishing member arranged on the polishing board with an unused polishing member by seizing the used polishing member from the polishing board and conveying the used polishing member to the second holding device, and by taking an unused polishing member from the first holding device and placing the unused polishing member on the polishing board.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the invention 
     The present invention relates to an end face polishing apparatus for polishing an end face of a rod-like member such as a fiber for optical communication. 
     2. Description of the Related Art 
     A fiber for optical communication is used by fixedly adhering the fiber into a center hole of a ferrule which is a main member of a connector and polishing an end face of the ferrule and an end face of the fiber simultaneously to be flat and smooth to thereby finish them in mirror faces. When polished faces of the ferrule and the fiber which have been polished to finish are not faces orthogonal to a center axis of the ferrule or there causes a defect on the polished faces, in an optical connector where the ferrules are oppositedly connected, an accuracy in positions thereof opposed to each other is deteriorated and loss is enlarged. Accordingly, the polished face of the ferrule including the optical fiber needs to polish to finish in high accuracy. 
     There is disclosed a conventional optical fiber end face polishing apparatus in, for example, Japanese unexamined Patent No. 26456/1991. The optical fiber end face polishing apparatus disclosed in the publication, is provided with an eccentric board rotating on a concentric circle of a rotating circular board, the eccentric board is provided with planetary gears for transmitting rotation of a motor for revolution, these gears are coupled to a polishing board to thereby rotate and revolve the polishing board and in the meantime, end faces of a number of optical fibers held by a jig board are pressed to a polishing member fixed to the polishing board to thereby polish them. 
     Further, in respect of a ferrule, polishing operation of an end face thereof is carried out in a state of being fixed to the jig board and polishing powder or polishing solution (hereinafter, simply referred to as polishing powder) is adhered to a lower face and a side face of the jig board, an end portion of the ferrule and so on. In this case, conventionally, the jig board is turned upside down the ferrule fixedly held at the jig board, while spraying water supplied from a tap of water to predetermined portions, an operator rubs it by holding a cleaning brush or by using a cleaner whereby the end face of the ferrule and the jig board is cleaned. 
     As described above, according to the conventional optical fiber end face polishing apparatus, the polishing is carried out by pressing the end faces of a number of optical fibers held by the jig board to the polishing member fixed to the rotating and revolving polishing board. In this case, by a long period of use, the polishing member may clog and become unusable to necessitate interchange thereof or interchange with a polishing member having different roughness may be needed. However, according to the conventional polishing member, a polishing sheet is mounted on the polishing board via an elastic sheet and accordingly, operation of interchanging the polishing member is necessarily dependent on manual labor and there poses a problem in which operational efficiency is not excellent. 
     Further, polishing and cleaning of the ferrule is carried out by manual operation of the operator by using the above-described respectively independent polisher, cleaner and the like. Accordingly, there poses a problem in which mass production performance is deteriorated and the cost is high. Further, when the operator carries out the polishing operation, a more or less variation is caused in respective operation, for example, in setting urging force exerted on the ferrule in polishing operation or the like and there poses a problem in which the quality is not stabilized. 
     In view of such a situation, it is an object of the invention to provide an end face polishing apparatus achieving promotion of operational performance by automatically interchanging polishing members for polishing an end face of a ferrule, further, to provide an end face polishing and cleaning apparatus for automatically carrying out polishing and cleaning operation. 
     SUMMARY OF THE INVENTION 
     According to a first aspect of the invention, there is provided an end face polishing apparatus characterized in an end face polishing apparatus in which whereas a jig board mounted with a rod-like member is supported by an apparatus main body by a supporting mechanism, a polishing board mounted with a polishing member for polishing the rod-like member is supported by the apparatus main body rotatably and pivotably by a drive mechanism for polishing the rod-like member mounted to the jig board by the supporting mechanism by pressing the rod-like member to the rotating and pivoting polishing board, wherein the polishing member is mounted to the polishing board attachably thereto and detachably therefrom, further comprising an automatic interchanging device for interchanging the polishing member which is mounted to the polishing board and which has been used with the polishing member which is stored at a predetermined position and which is to be used. 
     According to a second aspect of the invention, there is provided the end face polishing apparatus according to the first aspect, characterized in that the automatic interchanging device comprises a moving member supported horizontally movably at a side of the polishing board, an elevating member elevatably supported by the moving member, a supporting arm in which whereas a base end portion thereof is fixed to the elevating member, a front end portion thereof is extended to above the polishing board and a supporting member attached to the front end portion of the supporting arm and capable of supporting the polishing member from below. 
     According to a third aspect of the invention, there is provided the end face polishing apparatus according to the second aspect, characterized in that whereas a flange portion is provided at an outer peripheral portion of the polishing member, the supporting member is engaged with the polishing member in a horizontal direction and capable of supporting the flange portion from below. 
     According to a fourth aspect of the invention, there is provided the end face polishing apparatus according to any one of the first through the third aspects, characterized in that a number of the polishing members which are to be used are laminated and mounted at a predetermined position. 
     According to a fifth aspect of the invention, there is provided the end face polishing apparatus according to any one of the first through the fourth aspects, characterized in that a number of the polishing members which are to be used are laminated and mounted at the predetermined position. 
     According to a sixth aspect of the invention, there is provided the end face polishing apparatus according to any one of the first through the fifth aspects, further comprising a plurality of recovering boxes for recovering the polishing members which have been used in accordance with kinds thereof. 
     According to a seventh aspect of the invention, there is provided the end face polishing apparatus according to any one of the first through the sixth aspects, characterized in that the supporting mechanism comprises a jig board supporting arm in which whereas a front end portion thereof holds the jig board, a base end portion thereof is supported movably in the up and down direction in a state in which the base end portion is extended to a side thereof and held substantially horizontally and elevating means for supporting the base end portion of the jig board supporting arm elevatably in the up and down direction and lowering the jig board supporting arm such that the rod-like member attached to the jig board is pressed to the polishing member by a predetermined pressure. 
     According to an eighth aspect of the invention, there is provided an end face polishing and cleaning apparatus characterized in that in the end face polishing apparatus according to the seventh aspect, further comprising a cleaner for cleaning a lower face of the jig board and the rod-like member attached to the jig board at a side of the polishing board, wherein the supporting mechanism comprises jig board moving means for reciprocally moving the jig board from the polishing board to the cleaner by moving the jig board supporting arm in the horizontal direction along with the elevating means. 
     According to a ninth aspect of the invention, there is provided the end face polishing apparatus according to the eighth aspect, characterized in that the cleaner comprises a cleaning brush for cleaning an end portion of the rod-like member and a lower face portion of the jig board by being rotationally moved in a state in which the cleaning brush is brought into contact with the lower face of the jig board. 
     According to a tenth aspect of the invention, there is provided the end face polishing apparatus according to any one of the first through the ninth aspects, characterized in that a drive mechanism of the polishing board is revolved while being rotated in a state in which the jig board is mounted. 
     According to an eleventh aspect of the invention, there is provided the end face polishing apparatus according to the tenth aspect, characterized in that the drive mechanism of the polishing board comprises stop position controlling means for stopping the polishing board at a predetermined position. 
     According to the invention, in exchanging the polishing members, the automatic interchanging device automatically interchanges the polishing member mounted to the polishing board with the polishing member stored at the predetermined position and promotion of operational performance is achieved. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a plane view of an end face polishing apparatus according to an embodiment of the invention, 
     FIG. 2 is a front view of the end face polishing apparatus, 
     FIG. 3 is a side view of the end face polishing apparatus, 
     FIG. 4 is an outline view of a supporting mechanism of a jig board, 
     FIG. 5 is a plane view of the jig board, 
     FIG. 6 is an outline view representing a state of engaging the supporting mechanism and the jig board, 
     FIG. 7 is a sectional view representing a state of engaging the supporting mechanism and the jig board, 
     FIG. 8 is an outline view of a supporting mechanism portion, 
     FIG. 9 is a plane view of an automatic interchanging device of a polishing member, 
     FIG. 10 is an outline view representing a drive unit of the automatic interchanging device of the polishing member, 
     FIG. 11 is an outline view of a supporting arm of the polishing member, and 
     FIG. 12 is an outline view representing a state of engaging the polishing member by the supporting member. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A detailed explanation will be given of embodiments of the invention in reference to drawings as follows. 
     FIG. 1 shows a plane view of an end face polishing apparatus according to an embodiment of the invention, FIG. 2 shows a front view of the end face polishing apparatus, FIG. 3 shows a side view of the end face polishing apparatus, FIG. 4 shows an outline view of a supporting mechanism of a jig board, FIG. 5 shows a plane view of the jig board, FIG. 6 shows an outline view representing a state of engaging the supporting mechanism and the jig board, FIG. 7 shows a sectional view representing the state of engaging the supporting mechanism and the jig board, FIG. 8 shows an outline view of the supporting mechanism, FIG. 9 shows a plane view of an automatic interchanging device of the polishing member, FIG. 10 shows an outline view representing a drive unit of the automatic interchanging device of the polishing member, FIG. 11 shows an outline view of a supporting arm of the polishing member and FIG. 12 shows an outline view representing a state of engaging the polishing member by a supporting member. 
     According to the end face polishing apparatus of the embodiment, as shown in FIG.  1  through FIG. 3, an apparatus main body  11  is installed with a polisher  12 , a cleaner  13 , a jig board  14  for fixing a plurality of ferrules as rod-like members, a supporting device  15  for movably supporting the jig board  14 , an automatic exchanging or interchanging device  16  for interchanging polishing members of the polisher  12  and a holding device or containing magazine  17  for containing the polishing members to be interchanged. 
     The polisher  12  carries out polishing of a front end of a ferrule by rotating a polishing board  21  arranged on the apparatus main body  11  while revolving it. The polishing board  21  can carry out revolving movement by a predetermined eccentric amount by driving a motor for revolution, not illustrated, and the polishing board  21  can be rotated by driving a motor for rotation, not illustrated. Further, according to the embodiment, there is installed stop position controlling means, not illustrated, for controlling such that a position of stopping the revolution motor is disposed always at a constant position. 
     As shown in FIG. 12, an upper portion of the polishing board  21  is integrally and rotatably fitted with a polishing member  22  in a shape of a circular board. The polishing member  22  comprises a fitting portion  23  in a ring-like shape and a flange portion  24  formed at an upper portion of the fitting portion  23  and the upper portion is attached with a polishing film  26  via an elastic member  25  in a circular shape. Further, the fitting portion  23  and the elastic member  25  are molded by a plastic and the elastic member  25  adhered to the flange portion  24 . 
     Further, the elastic member  25  is a rubber sheet comprising a material of, for example, CR, silicone, urethane, NBR, natural rubber, SBR or the like and having a thickness of, for example, about 2 mm and is fixedly attached to the flange portion of the frame member  1  by an adhesive agent or the like. A surface at least on an outer side of the elastic member  25  fixedly attached to the frame member  1  is finished into a mirror face having a surface roughness of, for example, Ra 1.6 μm or smaller. 
     Further, the polishing film  26  is mounted on the elastic member  25 . The polishing film  26  is only mounted on the elastic member  25  without interposing an adhesive agent or the like between the polishing film  26  and the elastic member  25  and no adhesive agent or the like is used therebetween. However, the surface of the elastic member  2  is finished into a mirror face and accordingly, the polishing film  26  is sufficiently adhered onto the surface of the elastic member  25 . 
     Further, although according to the embodiment, the fitting portion  23  as well as the flange portion  24  and the elastic member  25  are constituted as separate members, these may be integrally molded by an elastic member of rubber or the like. 
     Such a polishing member  22  is mounted to an upper portion of a polishing board  21  of an end face polishing apparatus. A ferrule is brought into contact with the polishing film  26  and the polishing board  21  is rotated to thereby polish a front end face of the ferrule. A detailed description thereof will be given later. 
     Further, as shown in FIG.  1  and FIG. 2, the cleaner  13  is installed contiguous to the polisher  12  on the apparatus main body  11  and can clean polishing powder attached to an end face of the ferrule and the jig board  14  by rotating and revolving three of cleaning brushes  27  by a drive motor, not illustrated. 
     Further, the jig board  14  can be fixed with a plurality of the ferrules and is made movable along a direction of installing the polisher  12  and the cleaner  13  in parallel with each other by the supporting device  15 . That is, a movement rail  31  is fixed along the direction of installing the polisher  12  and the cleaner  13  in parallel with each other above the apparatus main body  11 , a moving frame  32  is supported movably by the movement rail  31  and an elevating frame  33  is elevatably supported by the movement frame  32 . 
     Further, as shown in FIG.  4  through FIG. 6, the moving frame  32  is fixed with a pair of vertical guides  34 , a base end portion of a supporting elementor arm  35  is elevatably supported by the vertical guides  34  and the supporting arm  35  is penetrated movably in the up and down direction between upper and lower flange portions  36   a  and  36   b  integrally formed with a lower end portion of the elevating frame  33 . Further, the supporting arm  35  is supported to be urged downwardly by two of compression springs  37  relative to the elevating frame  33  and an intermediary between the two conventional springs  37  is mounted with a load cell  38  for detecting their load. Further, the elevating frame  33  is attached with a guide  39  in a cylindrical shape for supporting the compression springs  37  and the load cell  38 . 
     Meanwhile, a front end portion of the supporting arm  35  is fixed with a holding block  40  for holding the jig board  14  and the holding block  40  is integrally formed with a positioning portion  41  and attached with a holding ball  43  supported to be urged by a compression spring  42 . 
     The jig board  14  is formed in an octagonal shape in plane view, installed with attachment pieces  45  opposed to a number of V grooves  44  formed at an outer peripheral portion thereof and the attachment pieces  45  are fixed to the jig board  14  by fixing screws  46  while interposing ferrules W between the V grooves  44  and the attachment pieces  45  by which the ferrules can be interposed by the V grooves  44  and the attachment pieces  45 . Further, a boss portion  47  is formed at a central portion of an upper face of the jig board  14  and a central portion thereof is formed with an opening portion  48  into which the holding block  40  can be inserted from a side direction. Further, engaging flanges  49  are formed integrally with both sides of an upper portion of the opening portion  48  and a positioning hole  50  is formed at a central portion thereof. 
     Therefore, as shown in FIG. 7, by inserting the holding block  40  into the opening portion  48  of the boss portion  47  and engaging the holding ball  43  supported to be urged by the compression spring  42  with the positioning hole  50 , and positioning of the jig board  14  relative to the supporting arm  35  is carried out and the positioning portions  41  are engaged with the engaging flanges  49  by which the supporting arm  35  can pivotably hold the jig board  14 . 
     By moving the moving frame  32  along the movement rail  31 , the jig board  14  held by the supporting arm  35  can be moved between the polisher  12  and the cleaner  13  and by lowering the elevating frame  33  at the respective positions, polishing operation and cleaning operation of the held ferrules W can be carried out. 
     Further, as shown in FIG. 8, the elevating frame  33  is integrally installed with a nut  81  which is in mesh with a screw spindle  82 . Further, a vertical shaft  83  installed integrally with an upper portion of the screw spindle  82  is connected to a pressurizing motor  85  via a transmission member  84  of a rubber belt or the like. 
     Therefore, by lowering the elevating frame  33  by rotating the vertical shaft  83  in one direction and pressing the ferrules W to an upper face of the polishing member  22  (polishing film  26 ) of the rotating and revolving polishing board  21 , polishing of the end faces of the ferrules W is carried out. Further, by pressing the ferrules W to the respective rotating and revolving cleaning brushes  27 , cleaning of the end faces of the ferrules W and the jig board  14  is carried out. 
     Further, as shown in FIG.  1  through FIG. 3, the automatic interchanging device  16  can automatically interchange the polishing member  22  mounted to the polisher  12  with a polishing member to be used successively and contained in the containing magazine  17 . The containing magazine  17  is installed contiguous to the polisher  12 . A laminating portion  51  laminated with a number of polishing members in an order of a use schedule is supported movably in the side direction relative to the main body and an elevating base  54  can be elevated by rotating a screw shaft  53  by driving a drive motor  52 . Further, the elevating base  54  is elevated by driving the drive motor  52  in accordance with a detection sensor  55  installed at an upper portion thereof and a polishing member at an uppermost position laminated to the laminating portion  51  is disposed always at the same height. 
     Further, there are installed three of holding devices or collecting cases  56   a,    56   b  and  56   c  for collecting the polishing members  22  removed from the polisher  12  in accordance with kinds thereof contiguous to the containing magazine  17 . In this case, the collecting cases  56   a,    56   b  and  56   c  are for facilitating to reuse the polishing members to be reused by recovering them in accordance with, for example, roughness of mesh. Further, the polishing members not to be reused may be recovered by a prescribed collecting case regardless of roughness of mesh. 
     Meanwhile, as shown in FIG.  9  through FIG. 11, an upper portion of the apparatus main body  11  is fixed with a horizontal rail  61  in parallel with a direction of installing the polisher  12 , the containing magazine  17  and the collecting cases  56   a,    56   b  and  56   c,  a moving member  62  is movably supported by the horizontal rail  61 , the moving member  62  is fixed with a vertical rail  63  and an elevating member  64  is elevatably supported by the vertical rail  63 . Further, the moving member  62  is mounted with an elevating motor  65  and an eccentric cam shaft  67  of a rotating member  66  rotated by the elevating motor  65  is engaged with the elevating member  64 . 
     Further, the elevating member  64  is fixed with a base end portion of a supporting arm  69  extended to the side of the polisher  12  via an attachment bracket  68 . Meanwhile, a side of a front end portion of the supporting arm  69  is bent downwardly. At the front end portion a supporting member  70  formed in a shape of a semicircular arc in plane view is attached by attaching bolts  71  and supported by a supporting rod  72 . Further, a detection sensor  73  is mounted to the front end portion of the supporting arm  69 . 
     The supporting member  70  can transport the polishing member  22  mounted to the polishing board  21  of the polisher  12  by supporting it from below to the collecting cases  56   a,    56   b  and  56   c  and can transport the polishing member disposed at the uppermost portion of the containing magazine  17  by supporting it from below to the polishing board  21 . That is, as shown in FIG. 12, according to the supporting member  70 , an inner diameter portion  70   a  thereof is attachable and detachable to and from the engaging portion  23  of the polishing member  22  and by elevating the supporting member  70  in a state in which the inner diameter portion  70   a  is engaged with the engaging portion  23 , an upper face portion  70   b  thereof is brought into contact with the flange portion  24  and the polishing member  22  can be lifted. 
     Further, an upper face of the apparatus main body  11  is installed with an operation panel  80  for operating the polisher  12 , the cleaner  13 , the jig board  14  as well as the supporting device  15 , the automatic interchanging device  16  and so on of the end face polishing apparatus. 
     Here, an explanation will be given of the operation of polishing and cleaning the end portion of the ferrule and operation of interchanging the polishing members by using the end face polishing apparatus according to the invention constituted as described above. 
     According to the end face polishing apparatus of the embodiment, as shown in FIG.  1  through FIG. 3, respective operations other than attachment and detachment of the ferrule W to and from the jig board  14  and attachment and detachment of the jig board  14  to and from the supporting device  15  are all carried out by the operation panel  80 . Therefore, when the ferrules W and the jig board  14  are attached and inputting operation to the operational panel  80  is carried out by the operator, firstly, the jig board  14  is horizontally moved by the supporting device  15  and moved to the central axis of the polishing board  21  on the polisher  12 , successively the jig board  14  is lowered to a predetermined position. The predetermined position is a position for bringing the end face of the ferrule into contact with the polishing member  22  (polishing film  26 ) mounted on the polishing board  21  by predetermined load. Thereafter, by operating the polisher  12  and rotating the polishing member  22  along with the polishing board  21  as described above, the end face of the ferrule is polished to a predetermined shape. 
     When polishing of the end face of the ferrule has been finished, the jig board  14  is moved to above the cleaner  13  by the supporting device  15  and the jig board  14  is lowered again to a predetermined position. The predetermined position is a position of bringing the end face of the ferrule into contact with the cleaning brushes  27  of the cleaner  13  by predetermined load. Further, when the ferrule is arranged at the predetermined position, by operating the cleaner  13  and cleaning the end face of the ferrule and the jig board  14  as described above, a series of operations are completed. 
     The operation of polishing and cleaning the end face of the ferrule can continuously be carried out only by automatically moving the jig board  14  in a shape of inverse U by repeating horizontal movement and vertical movement thereof in this way. 
     Further, when the polishing operation needs to carry out in several stages, the polishing members  22  are interchanged by the automatic interchanging device  16  and the same operation is repeated by a necessary number of times. 
     In this case, firstly, the moving member  62  is moved along the horizontal rail  61  to thereby dispose the supporting member  70  at an upper portion of a side portion of the polishing member  22  of the polisher  12 , successively, the elevating member  64  is lowered along the vertical rail  63  by which as shown in FIG. 12, the supporting member  70  is disposed at a side of the polishing member  22 . Further, by moving the moving member  62  horizontally under the state and moving the supporting member  70  to the side of the polishing member  22 , the inner diameter portion  70   a  is engaged with the engaging portion  23  of the polishing member  22  from a side direction, successively, the elevating member  64  is lifted by which the upper face portion  70   b  is brought into contact with the flange portion  24  and draws and lifts the polishing member  22  from the polishing board  21 . 
     When the supporting member  70  supports the polishing member  22 , the moving member  62  is horizontally moved to thereby transport the polishing member  22  supported by the supporting member  70  to the collecting cases  56   a,    56   b  and  56   c.  At this occasion, the supporting member  70  drops the polishing member  22  into a predetermined one of the collecting cases  56   a,    56   b  and  56   c.    
     When the polishing member  22  mounted to the polishing board  21  is removed in this way, the moving member  62  is horizontally moved to the containing magazine  17  along the horizontal rail  61  and by operation similar to the above-described, the supporting member  70  supports the polishing member disposed at the uppermost portion of the containing magazine  17 . Further, again, the moving member  62  is horizontally moved to the polisher  12 , the polishing member supported by the supporting member  70  is disposed to above the polishing board  21  of the polisher  12  and the elevating member  64  is lowered along the vertical rail  63  by which the polishing member  22  supported by the supporting member  70  is mounted to the polishing board  21 . Thereafter, the supporting member  70  is horizontally moved, lifted and escaped. 
     In this way, according to the end face polishing apparatus of the embodiment, when the polishing member  22  mounted to the polishing board  21  of the polisher  12  is interchanged by other member, the automatic interchanging device  16  draws the polishing member  22  of the polishing board  21  and carries it to the collecting cases  56   a,    56   b  and  56   c  and in the meantime, other polishing member is transported from the containing magazine  17  to the polisher  12  and is mounted to the polishing board  21  by which the polishing member can be interchanged automatically. 
     [Effect of the Invention] 
     As has been explained in details in respect of the embodiment, according to the end face polishing apparatus of the invention, there is provided an end face polishing apparatus in which a jig board mounted with a rod-like member is supported by an apparatus main body by a supporting mechanism, a polishing board mounted with a polishing member for polishing the rod-like member is supported by the apparatus main body rotatably and pivotably by a drive mechanism for polishing the rod-like member mounted to the jig board by the supporting mechanism by pressing the rod-like member to the rotating and pivoting polishing board, and the polishing member is mounted to the polishing board attachably thereto and detachably therefrom. The invention further comprises an automatic interchanging device for interchanging the polishing member which is mounted to the polishing board and which has been used with the polishing member which is stored at a predetermined position and which is to be used. Accordingly, when the polishing members are interchanged, the automatic interchanging device automatically interchanges the polishing member mounted to the polishing board with the polishing member stored at the predetermined position and promotion of operational performance can be achieved. 
     Further, according to the end face polishing apparatus of the invention, particularly, whereas the flange portion is provided at the outer peripheral portion of the polishing member, the supporting member is engaged with the polishing member in the horizontal direction to be capable of supporting the flange portion from below, in the meantime, the moving member is supported horizontally movably at the side of the polishing board, the elevating member is elevatably supported by the moving member, the supporting arm the front end portion of which is extended to above the polishing board is fixed to the elevating member, the supporting member capable of supporting the polishing member from below is attached to the front end portion of the supporting arm and therefore, interchanging of the polishing members can be carried out only by simple movement in the up and down, and right and left directions. 
     Further, the polishing member is constituted by the fitting portion having the frame shape surrounding the upper portion of the polishing board and the flange portion being integrally molded with the fitting portion, the elastic member fixedly attached to the flange portion of the frame member and the polishing film mounted on the upper face of the elastic member. Accordingly, when the polishing film is interchanged, the polishing film is interchanged together with the polishing member and therefore, the polishing solution needs not to wipe off and the operational efficiency can be promoted. 
     Further, the surface of the elastic member is finished into a mirror face and accordingly, the polishing sheet can firmly be adhered onto the elastic member by only mounting the polishing sheet thereon without using an adhesive agent or the like and the polishing film does not shift to drop during polishing and rotating operation. Further, the polishing film can also be peeled off and can be interchanged with ease.