jig

Abstract

To provide a jig capable of chamfering and deburring the boundary portion of a workpiece having two adjacent surfaces at an accurate angle and size. [Solution] The jig 150 includes a first receiving portion 160 and a second receiving portion 200. When viewed from the direction of the rotation axis of a drive pulley 25 that drives a sand belt 110, the first receiving portion 160 has a first receiving surface 181 that is inclined relative to a flat sanding surface 111 of the sand belt 110 and can receive a workpiece W, and the second receiving portion 200 is inclined relative to the flat sanding surface 111 and has a second receiving surface 221 that is inclined relative to the first receiving surface 181 and can receive a workpiece W, the first receiving portion 160 and the second receiving portion 200 are fixed to the belt sander 10, and the second receiving surface 221 can move toward and away from the first receiving surface 181.

Description

[Technical Field]

[0001] The present invention relates to a jig to be disposed on a belt sander. [Background technology]

[0002] A conventional belt sander is described in Patent Document 1. According to this, the belt sander is composed of an abrasive belt (sand belt), a drive pulley, a master idler pulley, a backup plate, etc. The belt is stretched between the drive pulley and the master idler pulley, and a backup plate is arranged along the back surface of the belt (see [Prior Art], Fig. 5).

[0003] When polishing a workpiece W, as shown in Figure 20, a flat processing jig J is placed perpendicular to the belt, and the workpiece is guided by the jig during processing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-156692 Summary of the Invention [Problem to be solved by the invention]

[0005] The belt sander jig J has one guide surface, so that it can deburr a large surface, as shown in FIG. 20(a), particularly when processing a thin plate workpiece W.

[0006] However, as shown in Figure 20(b), the boundary portion of a workpiece W having two adjacent surfaces can be machined by setting the angle of the jig J to any angle such as 30 degrees, 45 degrees, or 60 degrees. However, since the amount of pressing of the workpiece W cannot be adjusted, there is a problem in that the length of the inclined surface cannot be machined accurately.

[0007] 20(c) could also be considered, but since the workpiece W could not be properly guided by the surface of the jig J, the position of the workpiece W was unstable and it was necessary to process it in a state where it could not be placed on the belt at an accurate angle, which resulted in the problem of inaccurate chamfering although deburring was possible. Therefore, it was difficult to chamfer and deburr the boundary portion of two adjacent surfaces of the workpiece W at an accurate angle and dimensions.

[0008] SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a jig that can chamfer and deburr the boundary portion of a workpiece having two adjacent surfaces at an accurate angle and size. [Means for solving the problem]

[0009] The invention described in claim 1 is a jig used in a belt sander that uses a sand belt to sand a workpiece having adjacent surfaces with at least one side sandwiched between them, The belt sander includes a first receiving portion and a second receiving portion, When viewed from the direction of the rotation axis of a drive pulley that drives the sand belt, the first receiving portion has a first receiving surface that is inclined with respect to the flat polishing surface of the sand belt and is capable of receiving the workpiece, the second receiving portion has a second receiving surface that is inclined relative to the flat polishing surface and is inclined relative to the first receiving surface and is capable of receiving the workpiece; the first receiving portion and the second receiving portion are fixed to the belt sander, The first receiving surface and / or the second receiving surface can be moved toward or away from each other or from each other.

[0010] With this, for example, by using the first receiving surface as a guide surface for the workpiece and the second receiving surface as a stopper for the workpiece, it is possible to chamfer and deburr the boundary portion of a workpiece having two adjacent surfaces with accurate angles and dimensions. Furthermore, since the dimensions of the chamfering process can be set and changed as appropriate, it is possible to accommodate detailed settings of the chamfer dimensions.

[0011] The first receiving surface and the second receiving surface are arranged to be perpendicular to each other.

[0012] This allows, for example, chamfering and deburring of the boundary portion between two adjacent faces of a rectangular parallelepiped workpiece with accurate angles and dimensions.

[0013] Further, the first receiving portion and / or the second receiving portion are provided with a relief portion that is cut out to prevent interference with the workpiece.

[0014] This makes it possible to chamfer and deburr the boundary portion of a workpiece having two adjacent surfaces with a convex cross section, as shown in FIG.

[0015] The first receiving surface and the second receiving surface can be arranged so that the side of the boundary between the two adjacent surfaces of the workpiece is parallel to the rotation axis of the drive pulley.

[0016] This allows the boundary portion of the workpiece having two adjacent surfaces to be arranged perpendicular to the feed direction of the sand belt, so that force is applied uniformly to the workpiece, thereby improving the ease of work for the worker.

[0017] Furthermore, the first receiving surface and / or the second receiving surface can move toward or away from each other or from each other in the feeding direction of the sand belt.

[0018] This allows for more precise setting of the chamfer dimensions. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a side view of a belt sander on which a jig according to an embodiment of the present invention is disposed. [Figure 2] FIG. 2 is an abbreviated plan view of the belt sander of the same embodiment. [Figure 3] FIG. 2 is a partial plan view of the belt sander of the embodiment. [Figure 4] FIG. 10 is an explanatory view showing the attached state of the jig as viewed from the front side. [Figure 5] FIG. 10 is an explanatory diagram showing the attachment state of the jig as viewed from the left side. [Figure 6] FIG. [Figure 7] FIG. 10 is an explanatory diagram of chamfering at C1. [Figure 8] 10 is an explanatory diagram seen from above when a relief portion is provided in the second receiving portion. FIG. [Figure 9] 10 is an explanatory view seen from the front when a relief portion is provided in the second receiving portion. FIG. [Figure 10] FIG. 10 is an explanatory perspective view of a case where a relief portion is provided in the second receiving portion. [Figure 11] FIG. 1 is an explanatory diagram of a workpiece having a convex cross section. [Figure 12] FIG. 10 is an explanatory diagram illustrating the setting of a first receiving surface and a second receiving surface. [Figure 13] FIG. 10 is a partial plan view of a modified example of the jig of the present invention. [Figure 14] FIG. 10 is an explanatory view showing the attachment state of the jig of the modified example as viewed from the left side. [Figure 15] 10 is an explanatory view showing the attached state of the jig of the same modified example as seen from the front side. FIG. [Figure 16] FIG. 10 is an explanatory front view showing an attached state of a jig according to another modified example of the present invention. [Figure 17] FIG. 10 is a partial plan view of yet another modified example of the jig of the present invention. [Figure 18]FIG. 10 is an explanatory view showing the attached state of the jig of the modified example as viewed from the right side. [Figure 19] 10 is an explanatory view showing the attached state of the jig of the modified example as viewed from the rear side. FIG. [Figure 20] FIG. 10 is an explanatory diagram of a jig in a conventional belt sander. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of a jig according to the present invention will be described with reference to the drawings. In the following description, arrows in each drawing indicate F for front, B for rear, R for right, L for left, U for top, and D for bottom. Note that in Figure 2 and subsequent drawings, some components may be omitted to facilitate understanding. Also, the circled area in Figure 6 is drawn to emphasize the stopper function, ignoring dimensions.

[0021] As shown in Figures 1 to 5, the belt sander 10 includes a motor 20, a drive pulley 25, a main body member 30, a belt tension adjustment mechanism 50, a driven pulley 105, a sand belt 110, and a belt angle adjustment mechanism 120.

[0022] The motor 20 is an existing electric motor, and has a drive pulley 25 attached to an output shaft 21. The motor 20 also has a boss portion 22 on the outside of the output shaft 21 to which a main body member 30 can be attached.

[0023] The main body member 30 is made of metal, and has a through hole 31 formed in the rear portion thereof, which penetrates in the left-right direction. A split groove 32 is formed in the main body member 30, which extends from the rear end thereof to the through hole 31.

[0024] The main body member 30 is attached to the motor 20 by inserting the boss portion 22 covering the outer periphery of the output shaft 21 of the motor 20 into the insertion hole 31 and fastening it with a bolt 34 using a screw hole 33 formed in the vertical direction across the split groove 32.

[0025] A bottomed groove 35 having a rectangular cross section and extending from the lower surface to the upper surface is formed in the main body member 30. The bottomed groove 35 is formed from the front end surface to the vicinity of the insertion hole 31 along the front-rear direction.

[0026] The main body member 30 is formed with two second elongated receiving holes 36 that are long in the front-rear direction and penetrate from the top surface of the main body member 30 to the top surface of the bottomed groove 35. The second elongated receiving holes 36 allow the second receiving portion 200 to move in the front-rear direction.

[0027] The main body member 30 has two first receiving screw holes 37 formed therein, which extend from the upper surface of the main body member 30 toward the upper surface of the bottomed groove 35. The first receiving screw holes 37 are located rearward of the second receiving elongated hole 36, and are used to attach and fix the first receiving portion 160.

[0028] The main body member 30 has six block screw holes 38 extending from the right side to the left side, to which blocks 60 (described later) can be attached.

[0029] The main body member 30 has four support screw holes 39 extending from the left side to the right side, to which a first support member 170 and a second support member 210, which will be described later, can be attached. The front support screw hole 39 allows the second receiving portion 200 to be attached, and the rear support screw hole 39 allows the first receiving portion 160 to be attached.

[0030] The belt tension adjusting mechanism 50 has a similar configuration to existing belt tension adjusting mechanisms, and includes a block 60, a cylindrical shaft 70, a spring 75, a spring receiver 80, and a cam member 90.

[0031] The block 60 is made of metal and has a U-shaped cross section, including a front wall 61, a rear wall 62, and a connecting wall 63 that connects the front wall 61 and the rear wall 62 together.

[0032] The front wall 61 is formed with a front shaft hole 64 penetrating therethrough in the front-rear direction, and the rear wall 62 is formed with a rear shaft hole 65 penetrating therethrough in the front-rear direction.

[0033] The connecting wall 63 has six screw holes 66 that can communicate with the block screw holes 38. The block screw holes 38 and the screw holes 66 are connected to each other and fastened together with bolts 67, thereby integrating the main body member 30 and the block 60.

[0034] A rectangular flat upper receiving plate 45 is attached with screws to the top surface of the block 60. The upper receiving plate 45 is formed with a first through hole 46 and a second elongated receiving hole 47 that penetrate in the vertical direction.

[0035] A rectangular flat support plate 48 is attached to the underside of the block 60 by screws.

[0036] The shaft 70 is made of metal and formed in a cylindrical shape, and is disposed so as to pass through the front shaft hole 64 and the rear shaft hole 65 .

[0037] The spring 75 is an existing compression coil spring, and its front end abuts against the spring receiver 80 and its rear end abuts against the rear wall 62 of the block 60 .

[0038] The spring receiver 80 is formed in a rectangular parallelepiped shape, and has an insertion hole 81 formed therein that penetrates in the front-rear direction and through which the shaft can be inserted.

[0039] The spring receiver 80 is formed with a split groove 82 that extends from the right end of the spring receiver 80 to the insertion hole 81 .

[0040] The spring receiver 80 is attached to the shaft 70 by passing the shaft 70 through the insertion hole 81 and fastening it with a bolt 84 using screw holes 83 formed in the vertical direction across the split groove 82.

[0041] A cam member 90 is attached to the upper side of the spring receiver 80 via a shaft member 92 so as to be rotatable about an axis extending in the vertical direction. The cam member 90 is provided with an elliptical arc portion 91 that is formed in an arc shape when viewed from the vertical direction. A handle 95 is attached to the cam member 90 so that it can be operated by hand.

[0042] A pulley bracket 100 having a U-shaped cross section is attached to the front end of the shaft 70. A driven pulley 105 is attached to the pulley bracket 100 so as to be rotatable about an axis in the left-right direction.

[0043] An endless sand belt 110 is stretched between the driving pulley 25 and the driven pulley 105. In this embodiment, the flat upper surface of the sand belt 110 serves as a flat polishing surface 111.

[0044] By rotating the cam member 90 about an axis in the vertical direction, the oval arc portion 91 comes into contact with the front wall 61 of the block 60, moving the spring receiver 80 rearward and changing the position of the driven pulley 105, thereby adjusting the tension of the sand belt 110. In other words, the sand belt 110 can be replaced.

[0045] The belt angle adjustment mechanism 120 is composed of a handle member 130, an adjustment block 140 arranged to protrude forward from the main body member 30, and an adjustment bracket 101 arranged to protrude leftward from the pulley bracket 100.

[0046] The adjustment block 140 is formed with a screw hole 141 that penetrates in the vertical direction, and a threaded handle member 130 is screwed into the screw hole 141.

[0047] The adjustment bracket 101 is formed with a long hole 102 that is long in the front-rear direction and through which the handle member 130 can be inserted.

[0048] A snap ring 121 is attached to the lower end of the handle member 130 and below the adjustment bracket 101 to restrict upward movement of the handle member 130.

[0049] By rotating the handle member 130, the position of the adjustment bracket 101 is displaced in the vertical direction, the shaft 70 rotates about its axis, and the angle of the sand belt 110 becomes adjustable.

[0050] The jig 150 includes a first receiving portion 160 and a second receiving portion 200 that are arranged adjacent to each other.

[0051] The first receiving portion 160 is composed of a first support member 170 and a first receiving member 180 .

[0052] The first support member 170 has a vertical wall 171 and a horizontal wall 173 extending rightward from the vertical wall 171, and is formed in a substantially L-shape when viewed from the front-rear direction.

[0053] Two through holes 172 penetrating in the left-right direction are formed in the vertical wall 171. Two stepped through holes 174 penetrating in the up-down direction are formed in the horizontal wall 173. Two stepped screw holes 175 penetrating in the left-right direction are formed in the horizontal wall 173.

[0054] The first receiving member 180 has a trapezoidal cross section, is disposed at an angle relative to the flat grinding surface 111 of the sand belt 110, and has a first receiving surface 181 capable of receiving the workpiece W. In this embodiment, the first receiving surface 181 is set to be inclined at 45 degrees relative to the flat grinding surface 111.

[0055] The first receiving member 180 has a screw hole 182 formed from the left surface to the right surface.

[0056] The second receiving portion 200 is composed of a second support member 210 and a second receiving member 220 .

[0057] The second support member 210 has a vertical wall 211 and a horizontal wall 213 extending rightward from the vertical wall 211, and is formed in a substantially L-shape when viewed from the front-rear direction.

[0058] Two elongated through holes 212 penetrating in the left-right direction are formed in the vertical wall 211. Two stepped through holes 214 penetrating in the up-down direction are formed in the horizontal wall 213. Two stepped screw holes 215 penetrating in the left-right direction are formed in the horizontal wall 213.

[0059] The second receiving member 220 has a trapezoidal cross section, is inclined at 45 degrees relative to the flat grinding surface 111 of the sand belt 110, and has a second receiving surface 221 inclined at 90 degrees relative to the first receiving surface 181 and capable of receiving the workpiece W.

[0060] The second receiving member 220 has a screw hole 222 formed from the left surface toward the right surface.

[0061] The first support member 170 is attached to the main body member 30 by connecting the first receiving screw hole 37, the first through hole 46, and the stepped through hole 174, and by connecting the support screw hole 39 and the through hole 172, and by fastening them with a bolt 161.

[0062] The second support member 210 is attached to the main body member 30 by fastening a long rectangular parallelepiped piece 230 having a screw hole 231 with a bolt 201, which connects the second receiving elongated hole 36, the second receiving elongated hole 47 and the stepped through hole 214 and connects the support screw hole 39 and the through hole 212. The support screw hole 39 and the through hole 212 are covered with a plate member 240 which functions as a washer.

[0063] The stepped screw hole 175 and the screw hole 182 are connected to each other and fastened together with a bolt 185, thereby connecting the first support member 170 and the first receiving member 180.

[0064] The second support member 210 and the second receiving member 220 are connected by communicating the stepped screw hole 215 with the screw hole 222 and fastening them together with a bolt 225 .

[0065] With the above configuration, the second receiving surface 221 can move toward and away from the first receiving surface 181 in the feeding direction (front-rear direction) of the sand belt 110.

[0066] The function and operation of the jig 150 will now be described. The second receiving elongated hole 36, the second receiving elongated hole 47, and the stepped through hole 214 are communicated with each other, and the support screw hole 39 and the through hole 212 are communicated with each other, and they are fastened with bolts 201, and the second receiving member 220 is set at any position via the second support member 210. For example, as shown in FIG. 7, when chamfering C1, the distance between the first receiving member 180 and the second receiving member 220 is set to 1:1:approximately 1.41.

[0067] In this case, if the distance between the first receiving member 180 and the second receiving member 220 is set longer than the thickness of the workpiece W, the workpiece W will continue to be fed without stopping, and it will not be possible to chamfer it to the desired dimensions. Therefore, in order to make the second receiving member 220 function as a stopper, it is set slightly shorter than the chamfered surface of the workpiece W.

[0068] As shown in Fig. 6, one surface W1 adjacent to one side of the workpiece W is arranged so as to be in contact with the first receiving surface 181 of the first receiving member 180, and the workpiece W is moved toward the sand belt 110 until it abuts against the second receiving surface 221 while pressing the surface opposite to the one surface W1 toward the first receiving surface with a pressing member 245. At this time, the second receiving surface 221 abuts against the other surface W2 of the workpiece W and functions as a stopper, making it possible to chamfer to the set dimensions.

[0069] Furthermore, the angles of the first receiving surface 181 and the second receiving surface 221 relative to the flat abrasive surface 111 of the sand belt 110 can be set in advance, so that any angle can be set.

[0070] The jig 150 having the above configuration is a jig used in a belt sander 10 that uses a sand belt 110 to polish a workpiece W having adjacent surfaces W1 and W2 with at least one side sandwiched therebetween, The belt sander 10 includes a first receiving portion 160 and a second receiving portion 200, When viewed from the direction of the rotation axis of the drive pulley 25 that drives the sand belt 110, The first receiving portion 160 has a first receiving surface 181 that is inclined relative to the flat polishing surface 111 of the sand belt 110 and can receive the workpiece W, The second receiving portion 200 has a second receiving surface 221 that is inclined relative to the flat polishing surface 111 and is inclined relative to the first receiving surface 181 and is capable of receiving the workpiece W; The first receiving portion 160 and the second receiving portion 200 are fixed to the belt sander 10, and the second receiving surface 221 is movable toward and away from the first receiving surface 181.

[0071] According to this, for example, by using the first receiving surface 181 as a guide surface for the workpiece W and the second receiving surface 221 as a stopper for the workpiece W, it is possible to chamfer and deburr the boundary portion of the workpiece W having two adjacent surfaces W1, W2 with accurate angles and dimensions. Furthermore, since the dimensions of the chamfering process can be set and changed as appropriate, it is possible to accommodate detailed settings of the chamfering dimensions.

[0072] The first receiving surface 181 and the second receiving surface 221 are arranged to be perpendicular to each other.

[0073] This allows, for example, chamfering and deburring of the boundary portion between two adjacent faces W1, W2 of a rectangular parallelepiped workpiece W to be performed with accurate angles and dimensions.

[0074] In addition, the first receiving surface 181 and the second receiving surface 221 can be arranged so that the edge of the boundary between two adjacent surfaces W1, W2 of the workpiece W is parallel to the rotation axis of the drive pulley 25.

[0075] This allows the boundary portion of the workpiece W, which has two adjacent surfaces W1 and W2, to be arranged perpendicular to the feed direction of the sand belt 110, so that force is applied uniformly to the workpiece W, thereby improving the ease of work for the worker.

[0076] The second receiving surface 221 is capable of approaching and moving away from the first receiving surface 181 in the feeding direction of the sand belt 110 .

[0077] This allows for more precise setting of the chamfer dimensions.

[0078] Modifications of the present invention will be described below. In the following description, the same reference numerals will be used to designate components corresponding to those in the first embodiment, and the description thereof will be omitted in whole or in part.

[0079] As shown in FIGS. 8 to 10, a second receiving member 220A of the second receiving portion 200A is provided with a relief portion 224A that is cut out to prevent interference with the workpiece W.

[0080] More specifically, the portion of second receiving member 220A facing second support member 210 is similar to second receiving member 220, and is formed in the shape of a triangular prism having second receiving surface 221A with a lower height at the portion facing away from second support member 210. The portion cut out compared to second receiving member 220 becomes relief portion 224A.

[0081] The relief portion 224A may be provided on the first receiving member, the first receiving member and the second receiving member.

[0082] In the above modification, it can be said that the first receiving portion and / or the second receiving portion are provided with a relief portion 224A that is cut out to prevent interference with the workpiece W.

[0083] With the jig 150, by utilizing the right end faces of the first receiving member 180 and the second receiving member 220, it is possible to chamfer the boundary portions as shown by the reference numerals 1 to 8 in Figure 11, but there is a problem in that it is not possible to chamfer or deburr the boundary portions of a workpiece W having two adjacent surfaces W1 and W2 with a convex cross-section.

[0084] According to the above modification, for example, as illustrated in FIG. 11, it is possible to chamfer and deburr the boundary portion of a workpiece W having two adjacent surfaces W1, W2 of a workpiece W with a convex cross section.

[0085] Furthermore, a modified example of the present invention can also be attached and fixed in the configuration shown in Figures 13 to 15. In this case, the first receiving surface 181 and the second receiving surface 221 can move toward and away from each other.

[0086] More specifically, the main body member 30B has a dovetail groove 40B formed therein, which is narrower at the top and wider at the bottom, from the top surface to the bottom surface.

[0087] A piece 230B having a screw hole 231B and formed in the shape of a long hexagonal pillar corresponding to the dovetail groove 40B is disposed within the dovetail groove 40B.

[0088] First support member 170B is formed in the shape of a rectangular flat plate that does not have a portion corresponding to vertical wall 171, and has a protruding portion 176B on the underside that protrudes downward in the shape of a long rectangular pillar. First support member 170B is formed with a stepped through-hole 177B that penetrates from the upper surface of first support member 170B to the lower surface of protruding portion 176B.

[0089] Similar to the first support member 170B, the second support member 210B is formed in the shape of a rectangular flat plate that does not have a portion corresponding to the vertical wall 171, and has a protruding portion 216B on its underside that protrudes downward in the shape of a long rectangular pillar. The second support member 210B is formed with a stepped through-hole 217B that penetrates from the upper surface of the second support member 210B to the lower surface of the protruding portion 216B.

[0090] The first support member 170B is attached to the main body member 30B by inserting the protrusion 176B into the dovetail groove 40B, connecting the stepped through hole 177B and the screw hole 231B, and fastening the link 230B with a bolt 201B.

[0091] The second support member 210B is attached to the main body member 30B by inserting the protrusion 216B into the dovetail groove 40B, connecting the stepped through hole 217B and the screw hole 231B, and fastening the piece 230B with a bolt 201B.

[0092] With this configuration, the number of parts can be reduced and the configuration can be simplified.

[0093] 16 may also be employed. More specifically, a communicating groove 41C communicating with the bottomed groove 35 is formed in the main body member 30C instead of the second receiving elongated hole 36, and a second support member 210C having a protrusion 216C and a through hole 217C similar to the second support member 210B is connected to the second support member 210C by a bolt 201C using an elongated block 230C having a screw hole 231C.

[0094] This allows the second receiving surface 221 to move toward and away from the first receiving surface 181. Even in this embodiment, the number of parts can be reduced and a simple configuration can be achieved.

[0095] In this case, the first receiving portion side can have the same configuration as the first support member 170B. Even with this configuration, the number of parts can be reduced and the configuration can be simple.

[0096] 17 to 19 show other modified examples. In this case, the main body member 30D does not have a structure equivalent to the bottomed groove 35, but has an attachment groove 42D formed as a bottomed groove having a rectangular cross section extending from the top surface to the bottom surface.

[0097] A screw hole 43D is formed in the lower surface of the mounting groove 42D, extending from the upper surface to the lower surface.

[0098] The member that supports and fixes the first receiving member 180 and the second receiving member 220 is composed of an integrally formed fixed support member 152D.

[0099] The fixing support member 152D is formed in a substantially rectangular prism shape, and has a protruding portion 153D on the lower surface side that protrudes downward in the shape of an elongated rectangular prism. The fixing support member 152D has a through-hole 154D formed therein that penetrates from the upper surface to the lower surface of the protruding portion 153D.

[0100] The fixed support member 152D is formed with four elongated through holes 155D penetrating in the left-right direction.

[0101] The fixed support member 152D is attached to the main body member 30D by inserting the protrusion 153D into the attachment groove 42D, connecting the screw hole 43D and the through hole 154D, and fastening with a washer bolt 156D or the like.

[0102] The fixed support member 152D and the first receiving member 180 are connected by communicating the two rear elongated through holes 155D with the screw holes 182 and fastening them together with washer bolts 156D or the like.

[0103] The two front elongated through holes 155D are connected to the screw holes 222, and are fastened together with washer bolts 156D or the like, thereby connecting the fixed support member 152D and the second receiving member 220.

[0104] With this configuration, the first receiving surface 181 and the second receiving surface 221 can be moved closer to or farther away from each other with a small number of parts. In this case, the rear part of the fixed support member 152D and the first receiving member 180 form a first receiving portion, and the front part of the fixed support member 152D and the second receiving member 220 form a second receiving portion.

[0105] The jig of the present invention is not limited to the above-described configuration, and various design modifications are possible without departing from the gist of the present invention.

[0106] For example, in a configuration other than the above, the fixed side may be the first receiving portion and the movable side may be the second receiving portion. As an example, in the first embodiment, the side serving as the second receiving portion may be the fixed side and the side serving as the first receiving portion may be the movable side.

[0107] Furthermore, as illustrated in Figure 12, the angles of the first receiving surface (60 degrees relative to the flat polishing surface) and the second receiving surface (30 degrees relative to the flat polishing surface) relative to the flat polishing surface, and the angles between the first receiving surface and the second receiving surface can be changed as appropriate depending on the usage mode.

[0108] In addition, the tension adjustment mechanism can be one that applies tension to the sand belt stretched between the drive pulley and the driven pulley using the force of a spring, and that shortens the distance between the drive pulley and the driven pulley to allow the sand belt to be replaced, and in addition to the mechanism of this embodiment, can be one used in a belt sander manufactured by Panasonic Power Tools Co., Ltd., model number BH-43, for example.

[0109] In addition, the belt angle adjustment mechanism has a similar configuration to existing belt angle adjustment mechanisms, and by rotating the adjustment handle, the shaft of the tension adjustment mechanism rotates to adjust the angle of the sand belt.In addition to the mechanism of this embodiment, examples include those used in belt sanders manufactured by Panasonic Power Tools Co., Ltd., model number BH-43, etc.

[0110] In addition, the bottomed groove 35, the second receiving elongated hole 36, the dovetail groove 40B, the communicating groove 41C, etc. arranged in the belt sander can also be said to be slide guide parts that allow the first receiving surface and / or the second receiving surface to approach and move apart.

[0111] Furthermore, the elongated through-hole 212, the protrusion 176B, the protrusion 216C, the link 230B, the bolt 201B, the link 230C, the bolt 201C, etc. can be said to be slide portions of the first receiving portion and / or the second receiving portion.

[0112] Therefore, it can be said that the fixed positions of the first receiving surface and / or the second receiving surface can be moved closer to or farther apart by the slide guide portion arranged on the belt sander and the slide portion arranged on the first receiving portion and / or the second receiving portion. [Explanation of symbols]

[0113] 10 Belt Sanders 25 Drive pulley 110 Sand Belt 111 Flat polished surface 150 Jig 160 First receiving part 181 First receiving surface 200 Second receiving part 221 Second receiving surface 200A Second Receiving Part 224A Relief 160B First receiving part 200B Second receiving part 200C Second receiving part W Workpiece W1 One side W2 The other side

Claims

1. A jig used in a belt sander that uses a sand belt to polish a workpiece having adjacent surfaces with at least one side sandwiched between them, The belt sander includes a first receiving portion and a second receiving portion, When viewed from the direction of the rotation axis of a drive pulley that drives the sand belt, the first receiving portion has a first receiving surface that is inclined with respect to the flat polishing surface of the sand belt and is capable of receiving the workpiece, the second receiving portion has a second receiving surface that is inclined relative to the flat polishing surface and is inclined relative to the first receiving surface and is capable of receiving the workpiece; the first receiving portion and the second receiving portion are fixed to the belt sander, A jig characterized in that the first receiving surface and / or the second receiving surface are capable of approaching or moving away from each other or from each other.

2. The jig according to claim 1 , wherein the first receiving surface and the second receiving surface are disposed so as to be perpendicular to each other.

3. 2. The jig according to claim 1, wherein the first receiving portion and / or the second receiving portion are provided with a cutout relief portion to prevent interference with the workpiece.

4. The jig according to claim 1, characterized in that the first receiving surface and the second receiving surface can be arranged so that the edge of the boundary portion between two adjacent surfaces of the workpiece is parallel to the rotation axis of the drive pulley.

5. The jig according to claim 1, characterized in that the first receiving surface and / or the second receiving surface are capable of moving toward or away from each other or from each other in the feed direction of the sand belt.

Images