JP5303600B2 - Handheld belt sander - Google Patents

Description

  The present invention relates to a hand-held belt sander used for processing and finishing woodwork products and metal products.

  Such a hand-held belt sander is provided in a main body having a gripping portion, a driving pulley that is driven by a driving force from a motor, and is extended from the front portion of the main body to the front side. And a driven pulley positioned in front of the drive pulley, and an endless sander belt wound around the drive pulley and the driven pulley (for example, Patent Document 1).

  More specifically, in the hand-held belt sander, a rotation shaft is provided so as to extend in a direction perpendicular to the output shaft of the motor and away from the output shaft, and the motor is disposed on one side of the rotation shaft. A bevel gear that meshes with the output shaft and receives the rotational force of the output shaft, the drive pulley is provided on the other side of the rotary shaft, and a support portion that attaches and supports the base end portion of the arm. The main shaft is provided at the front portion of the main body so as to surround the bevel gear and the drive pulley on the rotating shaft.

Japanese Utility Model Publication No. 58-22240

  In the hand-held belt sander configured as described above, the bevel gear and the drive pulley are not only provided on the rotary shaft provided so as to extend away from the output shaft, but the arm support portion surrounds the bevel gear and the drive pulley. It is provided in the front part of the main body. For this reason, the bevel gear and the support portion are provided in this order from the side close to the output shaft of the motor, and the drive pulley is provided at a position farther from the output shaft of the motor than the support portion. That is, since the drive pulley is disposed at a position farthest from the output shaft of the motor, the offset amount between the output shaft of the motor and the sander belt increases. As a result, when the sander belt is pressed against the object to be processed while holding the grip portion, a large couple is generated that rotates the hand-held belt sander around the grip portion.

  For this reason, the operator has to grip the grip portion with a strong force in order to suppress a decrease in processing finish accuracy due to a couple of forces, which is disadvantageous in that the operability is poor.

  Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide a handheld belt sander with good operability.

A hand-held belt sander according to the present invention includes a main body having a gripping portion, a motor as a power source provided in the main body, a direction provided at a front portion of the main body and perpendicular to the output shaft of the motor. A rotating shaft extending to the rotating shaft, a bevel gear provided on the rotating shaft to transmit power from the motor to the rotating shaft, a driving pulley provided to be rotatable integrally with the rotating shaft, and a front portion of the main body. An arm that is attached to the support portion and extends to the front side; and a driven pulley that is attached to the front end side of the arm so as to be positioned in front of the driving pulley, the driving pulley and the driven pulley An endless sander belt is wound around the hand-held belt sander, and the rotating shaft extends on both the one side and the other side in the axial direction so as to intersect the output shaft. The driving pulley is arranged on one side of said rotary shaft, said support portion, said disposed on the front of the body on the other side of the rotary shaft, the output shaft is disposed substantially at the center of the body The drive pulley is arranged so as to be located inside the outer shape line of the main body .

According to the present invention, the rotation that extends to one side with respect to the output shaft by disposing the drive pulley on one side of the rotation shaft and the arm support on the front of the main body on the other side of the rotation shaft. Compared with the configuration in which the shaft is provided with both the drive pulley and the support portion, the drive pulley can be brought closer to the output shaft of the motor, and the offset amount of the drive pulley from the output shaft can be reduced.
Further, by disposing the drive pulley so as to be located on the inner side of the outline line of the main body, it is possible to make the tip portion of the hand-held belt sander compact, which is advantageous in terms of handling.

  In the hand-held belt sander according to the present invention, the bevel gear is disposed on the other side of the rotating shaft so as to mesh with the output shaft from the other side of the rotating shaft on the side opposite to the drive pulley. May be.

  According to this configuration, if the bevel gear is disposed on the other side of the rotation shaft so as to mesh with the gear portion of the output shaft from the other side of the rotation shaft on the side opposite to the drive pulley, the drive pulley is output. The shaft side can be made closer, and the offset amount of the drive pulley from the output shaft can be further reduced.

  The hand-held belt sander according to the present invention may be provided with a bearing that rotatably supports the rotating shaft, and the bearing may be disposed on the other side of the rotating shaft.

  According to this configuration, if the bearing is arranged on the bevel gear side that is the other side, the drive pulley can be brought closer to the output shaft side than the configuration in which the bearing is arranged on the drive pulley side. The amount of offset of the drive pulley from can be further reduced.

  Moreover, as for the handheld belt sander which concerns on this invention, the said bearing may be arrange | positioned inside the said support part.

  According to such a configuration, if the bearing is arranged using the space inside the support portion effectively, it is not necessary to secure a dedicated space for arranging the bearing in the middle of the rotating shaft. Not only can the degree of freedom be increased, but also the amount of offset of the drive pulley from the output shaft can be reduced. Furthermore, by arranging the bearing inside the support portion, the fixing force of the bearing can be increased, and the rigidity of the support portion is increased, so that the arm can be attached stably.

  As described above, according to the present invention, the drive pulley is arranged by arranging the drive pulley on one side of the both sides in the axial direction of the rotation shaft and providing the support portion on the front portion of the main body on the other side of the rotation shaft. It can be brought close to the output shaft of the motor, and the offset amount of the drive pulley from the output shaft can be reduced. Therefore, it is possible to provide a handheld belt sander with good operability that can suppress generation of couples.

The longitudinal side view of the handheld belt sander concerning one embodiment of the present invention is shown. The bottom view of the hand-held belt sander which concerns on the embodiment is shown. The top view of the front part of the handheld belt sander which concerns on the embodiment is shown. The longitudinal cross-sectional side view of the front part of the handheld belt sander which concerns on other embodiment is shown. The vertical side view of the principal part of the hand-held belt sander which concerns on other embodiment is shown.

  Hereinafter, an embodiment of a hand-held belt sander according to the present invention will be described with reference to FIGS.

  The hand-held belt sander 1 includes a main body 4 composed of a pair of split cases 2 and 3 that can be divided into upper and lower parts, and an endless shape that is disposed in front of the main body 4 and polishes a workpiece by the driving force of a motor 5. And a processing section 7 having a sander belt 6. In addition, a drive unit 8 having the motor 5 as a power source is provided in a substantially central portion of the main body 4, and a transmission for transmitting power from the drive unit 8 to the machining unit 7 is provided in the front part of the main body 4. A mechanism unit 9 is provided.

  The main body 4 is formed in a shape that is long in the front-rear direction, and has a rear portion 10 that is slimmed by taking a corner portion at the rear end, and has substantially the same diameter in the front-rear direction. A central part 11 having a space for storing the direction so as to be along the front-rear direction, and a front part 12 having a part located in front of the central part 11 and having a slightly larger diameter than the central part 11 And a front extending portion 13 further extending forward from the front end of the front portion 12.

  The central portion 11 of the main body 4 is set to have a diameter that can be easily grasped with one hand, and can be used as a grasping portion. In addition, an exhaust fan 14 attached to the output shaft 5A of the motor 5 so as to be integrally rotatable is housed in the front portion 12, and by rotating the exhaust fan 14 by driving the motor 5, The hot air and the like accumulated in the front portion 12 can be discharged outside through a plurality of discharge holes 15 (9 on the bottom surface (see FIG. 2) and 9 on the top surface (see FIG. 3)) formed in the front portion 12. ing. In addition, a plurality (seven) of outside air intakes 11 </ b> A are formed on the bottom surface of the central portion 11. Note that a plurality (seven) of outside air intakes (not shown) may be formed substantially on the upper surface of the central portion 11.

  At the front end of the front portion 12 of the first divided case 2 on the upper side of the divided cases 2 and 3, it extends upward (vertically) from the dividing line (lower end) of the divided case 2 and outwards toward the left and right ends. A concave first vertical wall portion 12A that is curved so as to be positioned is provided, and the front end of the front portion 12 of the lower second split case 3 extends to the split line side (upper end side) of the split case 3. A second vertical wall portion 12B is provided. Then, the front extension portion 13 is formed from an upper extension portion 13A extending forward from the lower end of the first vertical wall portion 12A and a lower extension portion 13B extending forward from the upper end of the second vertical wall portion 12B. It is composed.

  As shown in the enlarged view of FIG. 1, the lower extension 13B of the front extension 13 includes a plate-like front plate 13c that extends horizontally forward from the upper end of the second vertical wall 12B, and a front plate. 13c of the upper open type which is formed to protrude downward from the substantially central portion in the front-rear direction and in the left-right direction of 13c, and the vertical plate portion formed upward from the front end of the front plate portion 13c. 13e, and the upper end opening 13K of the lower extension 13B is closed by the upper extension 13A. The cylindrical portion 13d constitutes a support portion that attaches and supports a base end portion 26 of the arm 20 described later.

  Compared to the case where the main body 4 is constituted by two members, ie, a first divided case 2 and a second divided case 3, which are divided vertically at the center of the output shaft 5A of the motor 5, as compared with a case where the main body 4 is constituted by three or more members. The number of parts can be reduced, and the manufacturing cost can be reduced accordingly. In addition, it is possible to eliminate the possibility of a decrease in accuracy due to assembly errors.

  The drive unit 8 includes the motor 5 housed in the main body 4. The motor 5 includes an output shaft 5A that protrudes in the front-rear direction. The output shaft 5A is a pair of extending portions 16 that extend from the inner surfaces of the front and rear end portions of the split cases 2 and 3 toward the center portion. , 16 are rotatably supported by front and rear bearings 17, 17. 5 A of output shafts are arrange | positioned so that the front-back direction may be followed in the radial direction substantially center of the main body 4, and the gear part 5a is formed in the outer periphery of the front end.

  The processing unit 7 includes a driving pulley 18 provided at the upper end of the front extension 13 so as to be rotated by the driving force of the motor 5, a driven pulley 19 positioned in front of the driving pulley 18, and these driving pulleys. The sander belt 6 wound around the belt 18 and the driven pulley 19 and an arm attached to the cylindrical portion 13d so as to extend forward from the main body 4 and to which the driven pulley 19 is rotatably attached. 20.

  The transmission mechanism section 9 extends in a direction orthogonal to the output shaft 5A that outputs power from the motor 5 (vertical direction in FIG. 1) and crosses the axial direction of the output shaft 5A on one side. And a bevel gear 22 attached to the rotary shaft 21 to transmit the power from the motor 5 to the rotary shaft 21 in mesh with the gear portion 5a formed on the output shaft 5A. I have.

  The rotating shaft 21 is configured as a vertically long stepped shaft having a plurality of (5 in FIG. 1) shaft portions 21A to 21E having different diameters, and one end (lower end) in the longitudinal direction is located inside the cylindrical portion 13d. The bearing 23 accommodated (arranged) is rotatably supported, and the other end (upper end) in the longitudinal direction protrudes outside through a through hole 13a formed in the upper extending portion 13A. And the part which entered in the said front extension part 13 from the longitudinal direction other end of the rotating shaft 21 is prepared so that it may protrude in the longitudinal direction one end side (lower end side) at the inner surface (lower surface) of the said upper side extension part 13A. It is rotatably supported by a bearing 24 accommodated (arranged) in the cylindrical boss 13T.

  A screw is formed on the outer periphery of the shaft portion 21E located at the protruding end (upper end) of the rotating shaft 21, and after the drive pulley 18 is fitted into the shaft portion 21E of the protruding end of the rotating shaft 21, the nut 25 is fitted. The drive pulley 18 is assembled so as to rotate integrally with the rotary shaft 21 by being screwed into the shaft portion 21E.

  The bevel gear 22 is composed of a face gear, is fitted into the third shaft portion 21 </ b> C from the bottom of the rotating shaft 21, and meshes with the output shaft 5 </ b> A of the motor 5 from the lower side of the rotating shaft 21. Note that the lower end of the bevel gear 22 is in contact with the upper end of the second shaft portion 21 </ b> B from the bottom of the rotating shaft 21, so that the bevel gear 22 does not move to the lower end side of the rotating shaft 21.

  The arm 20 includes a ring-shaped base end portion 26 that is rotatably fitted to a cylindrical portion 13d located at the lower end of the front portion of the main body 4, and an upper end that is opposite to the lower end from the front end of the base end portion 26. A vertical portion 27 extending to the side, and a main body portion 28 extending forward from the upper end of the vertical portion 27 and having the driven pulley 19 rotatably attached to the tip thereof.

  The main body portion 28 includes a cylindrical fixed portion 28A that extends forward from the upper end of the vertical portion 27, and a movable portion 28B that is movably inserted into the fixed portion 28A. The fixed portion 28A includes a coil spring 29. The movable portion 28B is projected and urged by the coil spring 29, whereby the sander belt 6 wound around the drive pulley 18 and the driven pulley 19 is wound on the fixed belt 28A. Tension can be always applied.

  In addition, a latching and holding mechanism for holding the movable portion 28B at a predetermined position moved to the fixed portion 28A side is provided so that the belt of the wound sander belt 6 can be easily replaced. This locking and holding mechanism includes a protruding piece 30 (projected upward from a rear end portion of a guide member 34 described later) formed so as to project upward to the rear end side of the movable portion 28B, and the movable portion 28B. And a locking member 31 provided in the fixed portion 28A so as to be locked to the protruding piece 30 of the movable portion 28B when it is moved to the fixed portion 28A side to a predetermined position. The locking member 31 is provided on the upper surface of the fixed portion 28 </ b> A in a state that it can swing around a horizontal axis and is urged to swing clockwise by a spring 32. Accordingly, when the movable portion 28B is moved to a predetermined position on the fixed portion 28A side, the locking claw 31A of the locking member 31 is automatically locked to the protruding piece 30, and this locking causes the movable portion 28B to move to the position ( It can be locked and held at a shortened position). Thereby, the sander belt 6 to which no tension is applied can be easily removed. After the sander belt 6 is removed, a new sander belt 6 is disposed, and then the locking member 31 is swung counterclockwise to release the locking with the protruding piece 30. Along with this, the movable portion 28 </ b> B can be protruded by the urging force of the coil spring 29 to stretch the sander belt 6.

  The movable portion 28B includes an insertion portion 28b having a diameter that can be inserted into the fixed portion 28A, and a distal end portion 28c having a diameter larger than the diameter of the insertion portion 28b from the front end of the insertion portion 28b. Further, a vertical through hole 28K for penetrating and mounting a pin 33 for preventing rotation of the movable portion 28B relative to the fixed portion 28A is formed near the distal end portion 28c side of the insertion portion 28b of the movable portion 28B. . Further, a guide member 34 for sliding and guiding the inner peripheral surface of the sander belt 6 is screwed to the distal end portion 28c of the movable portion 28B.

  2 and 3, the guide member 34 includes a pair of upper and lower plate portions 34A and 34B covering the upper and lower surfaces of the distal end portion 28c, and one end side in the left and right width direction of the upper and lower plate portions 34A and 34B. And a vertical plate portion 34C that can contact the inner peripheral surface of the sander belt 6 and an auxiliary guide portion 34D that extends rearward from the rear end of the vertical plate portion 34C.

  A screw hole 27N is formed in the upper portion of the vertical portion 27 of the arm 20 into which the adjustment bolt 35 is screwed to prevent the tip of the arm 20 from floating upward due to the magnitude of the tension acting on the sander belt 6. Yes. Therefore, by changing the screwing amount of the adjusting bolt 35 into the screw hole 27N, the pressing force by which the tip of the adjusting bolt 35 pushes the front end surface 13F of the front extension portion 13 is adjusted, so that the tip of the arm 20 is moved upward. As shown in FIG. 1, the arm 20 can always be held in a horizontal posture without floating. Although not shown, it is preferable that the adjustment bolt 35 is provided with a detent means so that it does not rotate unexpectedly.

  As shown in FIG. 2, the base end portion 26 of the arm 20 is configured such that both end portions 36a and 36b can be brought into contact with and separated from each other, and is configured in an annular shape in a belt shape having substantially the same vertical width as the vertical dimension of the cylindrical portion 13d. The outer fitting portion 36, the pair of piece portions 36c and 36d protruding from the both end portions 36a and 36b of the outer fitting portion 36 to the outside of the outer fitting portion 36, and the piece portions 36c and 36d are fitted or separated from each other. A cam mechanism 37 for contacting and separating both end portions 36a and 36b of the portion 36 is provided.

  The cam mechanism 37 includes a headed pin 38 that is inserted into through holes 36e and 36f formed in the pair of pieces 36c and 36d, and a swing operation tool 39 that is pivotally connected to the tip of the headed pin 38. ing. Therefore, by swinging the swing operation tool 39 in the direction indicated by the arrow (clockwise) from the fixed state shown in FIG. 2, the head is moved away from the swing operation tool 39 (downward in FIG. 2). The attached pin 38 moves. As a result, the pair of pieces 36c and 36d can be separated from each other, and the both ends 36a and 36b of the outer fitting portion 36 are separated, thereby opening the closed outer fitting portion 36 fixed to the cylindrical portion 13d. The angle of the arm 20 can be adjusted in the horizontal direction around the vertical axis X passing through the center of the cylindrical portion 13d (two positions that are shifted by a predetermined angle from the position shown by the solid line in FIG. 3 to the left and right are shown by broken lines). ing). After the angle adjustment is completed, the head operating pin 39 moves toward the swing operating tool 39 by returning the swing operating tool 39 that has been operated to return to the position shown in FIG. However, one piece 36d moves to the other piece 36c side. Thereby, a pair of piece part 36c, 36d approaches mutually, and the external fitting part 36 can be clamped and fixed to the cylindrical part 13d. Due to the tightening and fixing, the inner diameter of the cylindrical portion 13d is reduced, and this reduction increases the fixing force of the outer ring of the bearing 23, so that the outer ring of the bearing 23 is reliably prevented from rotating during operation of the belt sander 1. it can. Furthermore, since the rigidity of the bearing 23 contributes to the rigidity of the cylindrical portion 13d, the rigidity of the cylindrical portion 13d is also increased. Therefore, the arm 20 can be stably attached to the cylindrical portion 13d with increased rigidity.

  In the hand-held belt sander 1 configured as described above, the drive pulley 18 is disposed on one side (upper end portion in FIG. 1) of both sides in the axial direction of the rotating shaft 21, and the base end portion 26 of the arm 20 is the main body. 4 is provided at the front portion of the main body 4 on the other side of the rotating shaft 21 (the lower end portion in front of the main body 4 in FIG. 1), so that the drive pulley 18 is motorized. 5 and the offset amount of the drive pulley 18 from the output shaft 5A can be reduced.

  Further, the bevel gear 22 is engaged with the gear portion 5a of the output shaft 5A from the other side (lower side in FIG. 1) of the rotation shaft 21 opposite to the drive pulley 18 (see FIG. 1). If the drive pulley 18 is disposed on the lower side in FIG. 1, the drive pulley 18 can be brought closer to the output shaft 5A side, and the offset amount of the drive pulley 18 from the output shaft 5A can be further reduced.

  Further, as shown in FIG. 1, in the present invention, the driving pulley 18 and the sander belt 6 are arranged so as to be located inside the outer shape line G of the main body 4, so that the tip of the handheld belt sander 1 is compact. This is advantageous in terms of handling.

  Furthermore, if the bearing 23 is arranged by effectively using the space inside the cylindrical portion 13d as the support portion, a dedicated space for arranging the bearing 23 in the middle of the rotating shaft 21 can be secured. Not only can the degree of freedom be increased, but also the offset amount of the drive pulley 18 from the output shaft 5A can be reduced. Furthermore, the bearing 23 is arranged inside the cylindrical portion 13d as a support portion, so that the fixing force of the bearing 23 can be increased, and the rigidity of the cylindrical portion 13d is increased so that the arm 20 can be stably attached. Can do.

  The hand-held belt sander according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the face gear shown in the embodiment may be replaced with a bevel gear. Note that the use of the face gear is advantageous in terms of manufacturing because it does not require high accuracy of the installation position as compared with the case of using the bevel gear.

  In the above-described embodiment, the bevel gear 22 is directly meshed with the output shaft 5A of the motor 5, but another gear or the like may be interposed and the bevel gear 22 may be meshed with the gear.

  In the above-described embodiment, the drive pulley 18 and the bevel gear 22 are disposed opposite to the both sides of the rotation shaft 21 with the output shaft 5A of the motor 5 interposed therebetween, but one of the rotation shafts 21 with respect to the output shaft 5A of the motor 5 is disposed. Both the drive pulley 18 and the bevel gear 22 are arranged on the side, and the support portion 13d of the arm 20 is provided at the front portion of the main body 4 on the other side of the rotation shaft 21 with respect to the output shaft 5A of the motor 5. Also good.

  Moreover, in the said embodiment, although the rotating shaft 21 is supported by the bearings 23 and 24 provided on both sides on both sides of the bevel gear 22, as shown in FIG. 4, it provided in the lower end (one end). The rotating shaft 21 may be supported by the two bearings 40 and 41 provided in the cylindrical portion 13d. Further, in FIG. 1, the cylindrical shaft portion 22A constituting the bevel gear 22 is on the lower side, whereas in FIG. 4, the cylindrical shaft portion 22B of the bevel gear 22 is on the upper side. . 4 shows the case where the two bearings 40 and 41 are provided, the bearings may be configured to have a vertical width larger than the vertical width of the single bearing 40 or 41 shown in FIG. For example, the rotating shaft 21 can be supported by only one bearing. Parts other than the transmission mechanism 9 shown in FIG. 4 are the same as those in FIG.

  In the above embodiment, the offset amount of the arm 20 with respect to the output shaft 5A of the motor 5 is made as small as possible. However, as shown in FIG. 5, the offset amount may be zero. In other words, by attaching the large-diameter gear 42 to the output shaft 5A of the motor 5, the bevel gear 22 meshing with the gear 42 is moved in one longitudinal direction of the rotary shaft 21 so as to be separated from the output shaft 5A of the motor 5 ( Since it can be moved to the lower side in the figure, the drive pulley 18 disposed on the other side can be disposed immediately before the output shaft 5A of the motor 5. Thereby, the offset amount can be made zero. In FIG. 5, the main body 4 provided with the divided cases 2 and 3 shown in FIG. 1 is omitted.

  Moreover, in the said embodiment, although the rotating shaft 21 was provided along the up-down direction with respect to the output shaft 5A of the motor 5 provided along the front-back direction, you may provide the rotating shaft 21 along the left-right direction. As long as the direction is orthogonal to the output shaft 5A, any direction may be used.

  In the embodiment, the arm 20 is provided so as to be capable of changing the angle with respect to the main body 4. However, the arm 20 may be fixed so that the angle cannot be changed with respect to the main body 4. In this case, the shape of the support portion 13d that attaches and supports the arm 20 to the main body 4 may be an elliptical shape, a square shape, or a polygonal shape.

  In the above embodiment, a hand-held belt sander connected to an outlet and driven by an AC power supply is shown. However, a hand-held belt sander driven by a DC battery may be used.

DESCRIPTION OF SYMBOLS 1 ... Hand-held belt sander, 2, 3 ... Split case, 4 ... Main body, 5 ... Motor, 5A ... Output shaft, 5a ... Gear part, 6 ... Sander belt, 7 ... Processing part, 8 ... Drive part, 9 ... Transmission Mechanism part, 10 ... Back part, 11 ... Center part (gripping part), 11A ... Outside air intake, 12 ... Front part, 12A, 12B ... Vertical wall part, 13 ... Front extension part, 13A ... Upper extension part, 13B ... Lower extension part, 13K ... Upper end opening, 13T ... Boss part, 13F ... Front end surface, 13a ... Through hole, 13c ... Front plate part, 13d ... Cylindrical part (support part), 13e ... Vertical plate part, DESCRIPTION OF SYMBOLS 14 ... Exhaust fan, 15 ... Discharge hole, 16 ... Extension part, 17 ... Bearing, 18 ... Drive pulley, 19 ... Drive pulley, 20 ... Arm, 21 ... Rotating shaft, 21A-21B ... Shaft part, 22 ... Bevel gear 22A, 22B ... Shaft, 23, 24 ... Bearing, 25 ... Nut, 26 ... Base end, 2 ... vertical part, 27N ... hole, 28 ... main body part, 28A ... fixed part, 28B ... movable part, 28K ... through hole, 28b ... insertion part, 28c ... tip part, 29 ... coil spring, 30 ... projecting piece, 31 ... Locking member, 31A ... locking claw, 32 ... spring, 33 ... pin, 34 ... guide member, 34A, 34B ... upper and lower plate part, 34C ... vertical plate part, 34D ... auxiliary guide part, 35 ... adjustment bolt, 36 ... 36a, 36b ... both ends, 36c, 36d ... one part, 36e, 36f ... through hole, 37 ... cam mechanism, 38 ... headed pin, 38A ... head, 39 ... swinging operation tool, 40, 41 ... Bearing part, 42 ... Gear, G ... Outline line, X ... Vertical shaft core

Claims (4)

A main body having a gripping part, a motor as a power source provided in the main body, a rotating shaft provided at a front portion of the main body and extending in a direction perpendicular to the output shaft of the motor, and the rotating shaft A bevel gear provided on the rotating shaft to transmit power from the motor, a driving pulley provided to be rotatable integrally with the rotating shaft, and a support provided at the front of the main body, An arm provided so as to extend to the front end of the arm and a driven pulley positioned forward of the drive pulley by being attached to the tip end side of the arm, and an endless sander belt wound around the drive pulley and the driven pulley. A hand-held belt sander to be turned,
The rotating shaft extends on one side and the other side in the axial direction so as to intersect the output shaft, the drive pulley is disposed on one side of the rotating shaft, and the support portion is Arranged at the front of the body on the other side of the rotating shaft ,
The hand-held belt sander is characterized in that the output shaft is disposed substantially at the center of the main body, and the drive pulley is disposed so as to be located on an inner side of an outline line of the main body .   The said bevel gear is arrange | positioned on the other side of this rotating shaft so that it may mesh | engage with the said output shaft from the other side of the rotating shaft on the opposite side to the said drive pulley. Handheld belt sander.   The hand-held belt sander according to claim 2, wherein a bearing that rotatably supports the rotating shaft is provided, and the bearing is disposed on the other side of the rotating shaft.   The hand-held belt sander according to claim 3, wherein the bearing is disposed inside the support portion.

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