Work equipment

Abstract

To improve workability.SOLUTION: In a belt sander 10, a reinforcement part 90 is provided in a side housing 24, where the reinforcement part 90 protrudes from the side housing 24 to one side in a shaft direction of a motor pulley 54 and a transmission pulley 56. Specifically, the reinforcement part 90 is extended along an overhead wire L to protrude from the side housing 24 to the left side, and is formed in a concave shape (a U-shape) which is opened to the right side when viewed from a longitudinal direction. This enables the reinforcement part 90 to reinforce the side housing 24, which can make bending rigidity of the side housing 24 in a lateral direction higher in comparison with a configuration in which the reinforcement part 90 is omitted in the side housing 24. This enables the belt sander 10 to operate properly, while properly maintaining a support state of the motor pulley 54 and the transmission pulley 56 by the side housing 24.SELECTED DRAWING: Figure 5

Description

Technical Field

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[0001] The present invention relates to a working machine.

Background Art

[0002] In the belt sander (working machine) described in Patent Document 1 below, a transmission mechanism using a belt is adopted as a mechanism for transmitting the driving force of a motor. Specifically, the transmission mechanism includes a first pulley, a second pulley, and a belt wound around the first pulley and the second pulley, and the first pulley rotates by the driving force of the motor.

Prior Art Documents

Patent Documents

[0007] One or more embodiments of the present invention are: A power transmission mechanism comprising a first pulley, a second pulley, and a belt stretched between the first and second pulleys; a support member for supporting the first and second pulleys; and a reinforcing portion provided on the support member, projecting in the axial direction of the first pulley and extending along an overhead line connecting the axis of the first pulley and the axis of the second pulley when viewed from the axial direction, wherein the outer diameter of the second pulley is set to be larger than the outer diameter of the first pulley, and the reinforcing portion gradually or stepwise expands toward the second pulley in a direction perpendicular to both the axial direction and the direction of extension of the overhead line. That is the case.

[0008] One or more embodiments of the present invention are working machines having a processing section that is operated by a driving force transmitted from the power transmission mechanism to process a workpiece, wherein the airflow is a dust-collecting airflow for collecting dust generated during processing.

[0009] One or more embodiments of the present invention are a work machine in which the first pulley, the second pulley, and the belt are located on one side in the axial direction with respect to the support member, the reinforcing portion protrudes from the support member to one side in the axial direction, and, when viewed from the axial direction, the reinforcing portion is located between the first pulley and the second pulley and inside the belt.

[0010] One or more embodiments of the present invention are provided such that the first pulley and the fan are integrally rotatable on the drive shaft of the motor. attitude It is a work machine.

[0011] One or more embodiments of the present invention are working machines in which the outer diameter of the second pulley is set to be larger than the outer diameter of the first pulley, and the reinforcing portion gradually or stepwise expands toward the second pulley in a direction perpendicular to both the axial direction and the direction of extension of the overhead line.

[0012] One or more embodiments of the present invention are work machines in which the support member is provided with a guide mechanism for guiding the flow of the airflow.

[0013] One or more embodiments of the present invention are: The aforementioned main housing The airflow causes the Main housing It has a suction chamber that draws in outside air, before Recording passage section teeth The work machine is connected to the suction chamber, and a fan housing for housing the fan is provided at one end of the passage in the front-rear direction, and the guide mechanism has a first guide section that extends in the front-rear direction and guides the airflow toward the fan.

[0014] In one or more embodiments of the present invention, the first guide section is a work machine that constitutes the lower wall of the passage section.

[0015] One or more embodiments of the present invention are work machines in which, when viewed from the left-right direction, the first guide portion intersects with the longitudinal intermediate portion of the reinforcing portion.

[0016] One or more embodiments of the present invention are a work machine in which the first pulley and the second pulley are configured to be rotatable about an axis in the left-right direction, the reinforcing portion protrudes from the support member to one side in the left-right direction, and the guide mechanism portion has a second guide portion provided on the reinforcing portion, and the second guide portion guides the airflow to the other side in the left-right direction.

[0017] One or more embodiments of the present invention are work machines in which the second guide portion is located in the fan housing portion.

[0018] One or more embodiments of the present invention are working machines in which the processing section comprises a drive pulley that rotates by a driving force transmitted from the power transmission mechanism, a driven pulley arranged parallel to the drive pulley, and an abrasive belt stretched between the drive pulley and the driven pulley, which rotates circumferentially as the drive pulley rotates.

[0019] One or more embodiments of the present invention are work machines in which a first pulley, a second pulley, and a cover member covering the belt are assembled to the support member, and a part of the cover member is disposed adjacent to the reinforcing portion in the protruding direction of the reinforcing portion.

[0020] One or more embodiments of the present invention are work machines in which at least a part of the reinforcing portion is configured to overlap the first pulley, the second pulley, or the belt when viewed in a direction orthogonal to the axial direction.

Advantages of the Invention

[0021] According to one or more embodiments of the present invention, workability can be improved.

Brief Description of the Drawings

[0022] [Figure 1] It is a plan view seen from above showing a belt sander according to this embodiment. [Figure 2] It is a side view seen from the left side of the belt sander shown in FIG. 1. [Figure 3] It is a side view seen from the right side of the belt sander shown in FIG. 1. [Figure 4] It is a cross-sectional view seen from the right side showing the communication state between the processing recess and the suction chamber of the main body housing shown in FIG. 3. [Figure 5] It is a side view showing the periphery of the side housing of the belt sander shown in FIG. 2 with the belt cover removed. [Figure 6] It is a cross-sectional view seen from the left side showing the inside of the side housing shown in FIG. 1 (cross-sectional view taken along line 6-6 of FIG. 1). [Figure 7] It is a perspective view seen from the right front obliquely showing the side housing shown in FIG. 6. [Figure 8] It is a cross-sectional view seen from above schematically showing the inside of the belt sander shown in FIG. 2 (cross-sectional view taken along line 8-8 of FIG. 2). [Figure 9]Figure 4 is a cross-sectional view (section 9-9 in Figure 4) taken from above, showing the communication between the suction chamber of the main housing and the dust collection air passage of the side housing. [Figure 10] Figure 2 shows a rear cross-sectional view (section 10-10 in Figure 2) of the belt cover assembled to the side housing. [Figure 11] This is a cross-sectional view corresponding to Figure 8, showing an example where the amount of protrusion from the side housing of the reinforcing part shown in Figure 8 has been changed. [Figure 12] This is a perspective view from the left front with the belt cover and side housing removed. [Modes for carrying out the invention]

[0023] The belt sander 10 as a work machine according to this embodiment will be described below with reference to the drawings. The arrows UP, FR, and LH shown in the drawings as appropriate indicate the top, front, and left sides of the belt sander 10, respectively. In the following description, when the directions of up and down, front and back, and left and right are used, they refer to the up and down direction, front and back direction, and left and right direction of the belt sander 10, unless otherwise specified.

[0024] As shown in Figures 1 to 3 and Figure 8, the belt sander 10 is configured as an electric tool for performing polishing and other processes on a workpiece. The belt sander 10 includes a housing 20, a power transmission mechanism 40, a drive pulley 66 and a driven pulley 72 as processing parts, and a belt cover 80 as a cover member. The belt sander 10 also has a reinforcing part 90 in the housing 20 to increase the bending rigidity of the side housing 24. The various components of the belt sander 10 will be described below.

[0025] (Regarding Housing 20) As shown in Figures 1 to 4, the housing 20 constitutes the outer casing of the belt sander 10. The housing 20 is composed of a main housing 22 as the housing section and a side housing 24 as a support member that constitutes the left end of the housing 20.

[0026] (Regarding the main housing 22) The main housing 22 is composed of housing members divided in the left-right direction, and the main housing 22 is formed by assembling these housing members together. The main housing 22 is formed in a hollow, roughly rectangular box shape with the thickness direction in the vertical direction and the longitudinal direction in the front-rear direction. At the lower end of the main housing 22, a machining recess 22A (see Figures 3 and 4) is formed for accommodating the drive pulley 66, driven pulley 72, and polishing belt 78, which will be described later. The machining recess 22A is formed in a concave shape that is open to the lower and right sides. A belt support portion 22B for supporting the polishing belt 78 is provided in the middle of the machining recess 22A in the front-rear direction. The belt support portion 22B (see Figures 3 and 4) protrudes from the left side to the right side of the machining recess 22A. The lower surface of the belt support portion 22B is formed along a plane perpendicular to the vertical direction.

[0027] At the rear of the main housing 22, a controller housing portion 22C is provided above the processing recess 22A. As shown in Figures 6, 8, and 9, a suction chamber 22D for sucking up dust generated during polishing is provided at the bottom of the controller housing portion 22C, and the suction chamber 22D is formed in a concave shape that opens to the left. The rear end of the suction chamber 22D is configured as a suction port portion 22D1 (see Figures 4 and 9) that opens to the rear, and the suction chamber 22D and the processing recess 22A are in communication through the suction port portion 22D1. Specifically, the rear wall of the processing recess 22A is formed in a roughly C-shape that opens to the front when viewed from the side, and the upper end of this rear wall is connected to the upper wall 22D2 of the suction chamber 22D (see Figure 4). The right portion of the front wall 22D3 of the suction chamber 22D extends in the left-right direction, while the left portion of the front wall 22D3 of the suction chamber 22D inclines forward as it moves to the left in a plan view (see Figure 9). The left end of the suction chamber 22D protrudes upward compared to the other parts and is open to the left (see Figures 6 and 10). The lower wall 22D4 of the suction chamber 22D constitutes the upper wall of the processed recess 22A.

[0028] As shown in Figure 10, a controller housing chamber 22E is formed in the upper part of the controller housing 22C. The controller housing chamber 22E is located adjacent to the right side of the left end of the suction chamber 22D, and a partition wall 22F is provided between the suction chamber 22D and the controller housing chamber 22E. Multiple air intake ports 22G are formed in the right wall of the controller housing chamber 22E. The controller 30 is housed in the controller housing chamber 22E, and the controller 30 is formed in a substantially rectangular, flattened shape with the vertical direction as the thickness direction and the front-to-back direction as the longitudinal direction.

[0029] As shown in Figures 1, 3, and 8, a motor housing section 22H is provided at the front of the main body housing 22, above the machined recess 22A and in front of the suction chamber 22D and the controller housing chamber 22E. The motor housing section 22H is formed in a substantially bottomed cylindrical shape that opens to the left, and the upper part of the motor housing section 22H protrudes above the controller housing section 22C. The right side of the motor housing section 22H and the right side of the controller housing chamber 22E are in communication in the front-rear direction.

[0030] A battery 32 is detachably mounted on the rear end of the main housing 22 from above. The battery 32 supplies power to the controller 30 and the motor 42, which will be described later. A handle portion 22J is integrally provided on the upper part of the main housing 22. The handle portion 22J extends diagonally upward and forward from the rear end of the main housing 22, and the front end of the handle portion 22J is bent downward and connected to the motor housing portion 22H. A knob portion 22K is provided on the front end of the handle portion 22J, and the knob portion 22K is formed in a roughly T-shape in plan view. Specifically, the knob portion 22K extends forward from the front end of the handle portion 22J, and the front end of the knob portion 22K protrudes outward in the left and right directions. A trigger 34 is provided on the front end of the handle portion 22J, and the trigger 34 protrudes downward from the handle portion 22J so that it can be pulled upward. A switch (not shown) is provided at the front end of the handle portion 22J. When the trigger 34 is pulled, the switch activates and outputs an ON signal to the controller 30.

[0031] (Regarding side housing 24) As shown in Figures 1, 2, and 5-10, the side housing 24 is made of resin. The side housing 24 is formed in a relatively shallow box shape that opens to the right, and extends along a direction that slopes upward as it moves towards the front when viewed from the left. The side housing 24 is positioned adjacent to the left side of the main housing 22 and is fastened and fixed to the main housing 22, while also blocking the motor housing section 22H and the suction chamber 22D from the left side.

[0032] Inside the side housing 24, a first guide wall 24A is formed in the middle of the vertical direction, serving as a first guide section that constitutes a guide mechanism 92 for guiding the flow of the dust collection air W2, which will be described later. The first guide wall 24A is formed in a substantially elongated plate shape with the plate thickness direction in the vertical direction and extending in the front-rear direction, protruding to the right from the bottom wall 24K (left wall) of the side housing 24. The bottom wall 24K is a flat plate portion of the side housing 24 that extends in the front-rear and up-down directions. As a result, the inside of the side housing 24 is divided vertically by the first guide wall 24A. The vertical position of the first guide wall 24A substantially coincides with the vertical position of the lower wall 22D4 of the suction chamber 22D in the main housing 22, and the upper part of the side housing 24 is configured as a dust collection air passage section 24B. As a result, the lower wall of the dust collection air passage section 24B is formed by the first guide wall 24A, and the dust collection air passage section 24B is in communication with the suction chamber 22D. The dust collection air passage section 24B, together with the suction chamber 22D, is configured as a passage for the dust collection air W2 generated by the fan 48, which will be described later.

[0033] The front end of the dust collection air passage section 24B is configured as a fan housing section 24C that houses the fan 48, which will be described later. The outer shape of the fan housing section 24C, as viewed from the left side, is formed in a roughly circular shape, corresponding to the motor housing section 22H, and protrudes upward compared to the parts of the dust collection air passage section 24B other than the fan housing section 24C. A first support cylinder section 24D (broadly speaking, an element that can be understood as a first support section) is formed in the approximate center of the bottom wall 24K of the fan housing section 24C, and the first support cylinder section 24D is formed in a cylindrical shape with the left-right direction as its axial direction, and protrudes to the right from the side housing 24.

[0034] At the rear of the upper end of the fan housing 24C, there is an exhaust pipe section 24E (broadly understood as an exhaust section) for discharging dust. The exhaust pipe section 24E is formed in a substantially cylindrical shape with the front-to-back direction as the axial direction, and the rear end of the exhaust pipe section 24E is connected to the rear of the upper end of the fan housing 24C, so that the exhaust pipe section 24E and the fan housing 24C are in communication. The rear end of the exhaust pipe section 24E is configured to allow attachment of dust collection attachments such as a dust box or a connecting hose for a dust collector, so that dust discharged from the exhaust pipe section 24E can be collected in a dust box or the like (Figure 2 shows an example in which a dust box 100 is attached to the exhaust pipe section 24E). In addition to the above, flexible dust collection bags are also included as dust collection attachments. Various dust collection attachments can be selectively attached to the exhaust pipe section 24E. The rear end of the discharge pipe section 24E is provided with an engaged section 24J into which the bent section 120B, described later, catches (engages).

[0035] A second support cylinder portion 24F (broadly understood as a second support portion) is formed on the rear end portion of the side housing 24 below the first guide wall 24A. The second support cylinder portion 24F is formed in a cylindrical shape with the left-right direction as its axial direction and protrudes to the right from the bottom wall of the side housing 24. A rear cylinder portion 24G is provided on the side housing 24 diagonally below the rear of the second support cylinder portion 24F. The rear cylinder portion 24G is formed in a cylindrical shape with the left-right direction as its axial direction and protrudes to the right from the bottom wall of the side housing 24. The rear cylinder portion 24G is positioned to overlap with the second support cylinder portion 24F, with a part of the second support cylinder portion 24F overlapping radially inward of the rear cylinder portion 24G.

[0036] As shown in Figure 8, an inner housing 26 for supporting a drive pulley 66, which will be described later, is provided on the right side of the rear end of the side housing 24. The inner housing 26 is formed in a substantially stepped cylindrical shape that opens to the left and is fixed to the side housing 24 so as to cover the rear cylindrical portion 24G and the second support cylindrical portion 24F from the right side. A shaft support portion 26A protruding to the right is integrally formed in the inner housing 26. The shaft support portion 26A is formed in a substantially cylindrical shape with its axial direction in the left-right direction and is arranged coaxially with the rear cylindrical portion 24G.

[0037] As shown in Figure 5, the side housing 24 has a surrounding wall 24H that encloses the transmission belt 64, which will be described later. The surrounding wall 24H is formed in a frame shape that extends along the overhead line L connecting the axis of the first support cylinder portion 24D (motor pulley 54, described later) and the axis of the second support cylinder portion 24F (transmission pulley 56, described later), when viewed from the left side, and protrudes to the left from the side housing 24. In other words, when viewed from the left side, the surrounding wall 24H extends in a direction that slopes upward as it moves towards the front. The width dimension of the surrounding wall 24H is set to decrease as it moves towards the front.

[0038] (Regarding the power transmission mechanism 40) As shown in Figure 8, the power transmission mechanism 40 comprises a motor 42, a motor pulley 54 as a first pulley, and a transmission pulley 56 as a second pulley. The motor 42 is configured as a brushless motor and is housed in the motor housing portion 22H of the main body housing 22. The motor 42 is electrically connected to the controller 30 and is driven by the control of the controller 30. The motor 42 has a drive shaft 42A with its axial direction in the left-right direction. The right end of the drive shaft 42A is rotatably supported by a motor bearing 44 held in the motor housing portion 22H, and the left end portion of the drive shaft 42A is rotatably supported by a motor bearing 46 held in the first support cylinder portion 24D of the side housing 24. The left end of the drive shaft 42A protrudes to the left of the side housing 24 and is located within the front end of the surrounding wall 24H.

[0039] A fan 48 is integrally rotatable on the left end of the drive shaft 42A, and the fan 48 is located within the motor housing portion 22H of the main housing 22 and the fan housing portion 24C of the side housing 24. The fan 48 has a fan base 48A, which is formed in a substantially circular shape with the left-right direction being the thickness direction. The right part of the fan 48 (the part to the right of the fan base 48A) is configured as a cooling fan portion 48B, and the left part of the fan 48 is configured as a dust collection fan portion 48C.

[0040] The cooling fan section 48B is configured as a centrifugal fan and is located within the motor housing section 22H. Specifically, the cooling fan section 48B has multiple blades that protrude to the right from the fan base 48A, and is configured to cause air flowing in from the center of the cooling fan section 48B to flow radially outward. This generates cooling air W1 that flows into the main housing 22 from the intake port 22G, and the cooling air W1 passes through the controller 30 and motor 42 before flowing into the cooling fan section 48B. A ring-shaped first fan guide 50 is provided on the radially outer side of the cooling fan section 48B, and the cooling air W1 that has flowed radially outward from the cooling fan section 48B is exhausted to the outside of the main housing 22 through an exhaust port 50A formed at the front of the first fan guide 50.

[0041] As shown in Figures 6 and 8, the dust collection fan section 48C, like the cooling fan section 48B, is configured as a centrifugal fan and is located within the fan housing section 24C. The dust collection fan section 48C has multiple blades that protrude to the left from the fan base 48A, and is designed to allow air flowing in from the center of the dust collection fan section 48C to flow radially outward. A roughly bottomed cylindrical second fan guide 52, which is open to the right, is provided on the radially outer side of the dust collection fan section 48C. A communication hole 52A is formed through the center of the bottom wall of the second fan guide 52, and the right end of the first support cylinder section 24D is inserted through the communication hole 52A. An opening 52B is also formed through the second fan guide 52, and is designed to allow air flowing out from the dust collection fan section 48C to flow from the opening 52B to the discharge cylinder section 24E. As a result, the dust collection fan section 48C generates a dust collection airflow W2, which flows into the suction chamber 22D from the suction port 22D1 of the main housing 22. The dust collection airflow W2 passes through the dust collection air passage section 24B of the side housing 24 and the communication hole 52A of the second fan guide 52 before flowing into the dust collection fan section 48C. The dust collection airflow W2 that flows into the dust collection fan section 48C flows radially outward from the dust collection fan section 48C, into the discharge pipe section 24E, and is exhausted to the outside of the housing 20 from the rear end of the discharge pipe section 24E.

[0042] As shown in Figures 5 and 8, the motor pulley 54 is formed in a substantially cylindrical shape with its axial direction oriented left to right, and is fixed to the left end of the drive shaft 42A of the motor 42 so as to be integrally rotatable, and is positioned within the front end of the surrounding wall 24H. The motor pulley 54 is configured as a so-called V-belt pulley, and multiple grooves are formed on the left outer circumference of the motor pulley 54.

[0043] The transmission pulley 56 is rotatably connected to the rear end of the side housing 24 via the transmission shaft 58. The transmission shaft 58 is formed in a substantially cylindrical shape with its axial direction in the left-right direction. The right end of the transmission shaft 58 is rotatably supported by a shaft bearing 60 held in the inner housing 26, the axial middle portion of the transmission shaft 58 is rotatably supported by a shaft bearing 62 held in the second support cylinder portion 24F, and the left end of the transmission shaft 58 protrudes to the left from the side housing 24 and is positioned within the rear end of the surrounding wall 24H. The transmission pulley 56 is formed in a substantially cylindrical shape with its axial direction in the left-right direction and is fixed integrally and rotatably to the left end of the transmission shaft 58. The transmission pulley 56 is configured as a so-called V-belt pulley, similar to the motor pulley 54, and has multiple grooves formed on its outer circumference. The outer diameter of the transmission pulley 56 is set to be larger than the outer diameter of the motor pulley 54.

[0044] A transmission belt 64, which is an endless belt, is stretched around the outer circumference of the motor pulley 54 and the transmission pulley 56, and the transmission belt 64 is configured as a V-belt. As a result, when the motor 42 is driven, the driving force of the motor 42 is transmitted to the transmission shaft 58 by the motor pulley 54, the transmission belt 64, and the transmission pulley 56, causing the transmission shaft 58 to rotate. A pinion gear 58A is formed on the outer circumference of the right end portion of the transmission shaft 58.

[0045] (Regarding drive pulley 66 and driven pulley 72) As shown in Figures 3, 4, and 8, the drive pulley 66 is rotatably connected to the inner housing 26 via the drive shaft 68. The drive shaft 68 is formed in a substantially cylindrical shape with its axial direction in the left-right direction, and is inserted into the shaft support portion 26A of the inner housing 26 and rotatably supported by the shaft support portion 26A. The left end of the drive shaft 68 protrudes to the left from the shaft support portion 26A and is located on the rear side of the transmission shaft 58. A cylindrical transmission gear 70 is integrally rotatably provided at the left end of the drive shaft 68, and the transmission gear 70 meshes with the pinion gear 58A of the transmission shaft 58. The right part of the drive shaft 68 protrudes to the right from the shaft support portion 26A and is located within the rear end of the machined recess 22A in the main housing 22.

[0046] The drive pulley 66 is formed in a roughly bottomed cylindrical shape that opens to the left. A cylindrical connecting shaft portion 66A is formed in the center of the bottom wall (right wall) of the drive pulley 66, with the left-right direction as its axial direction, and the connecting shaft portion 66A protrudes to the left from the bottom wall of the drive pulley 66. The right side of the drive shaft 68 is fitted into the connecting shaft portion 66A, and the drive pulley 66 is connected to the drive shaft 68 so as to be able to rotate together with it. As a result, when the motor 42 is driven, the driving force of the motor 42 is transmitted to the drive shaft 68, and the drive pulley 66 rotates together with the drive shaft 68. Specifically, the drive pulley 66 rotates clockwise when viewed from the right side.

[0047] The driven pulley 72 is formed in a cylindrical shape with its axial direction running in the left-right direction. The driven pulley 72 is positioned within the front end of the machined recess 22A and is rotatably supported by a support shaft 74. The support shaft 74 is fixed to a support plate 76A of a pulley support mechanism 76 for supporting the driven pulley 72, and the pulley support mechanism 76 is fixed to a belt support portion 22B of the main housing 22.

[0048] An endless abrasive belt 78 is stretched over the drive pulley 66 and the driven pulley 72, with the middle portion of the lower end of the abrasive belt 78 positioned adjacent to the lower side of the belt support portion 22B. The lower ends of the drive pulley 66 and the driven pulley 72 are positioned slightly above the lower surface of the belt support portion 22B. As a result, when the drive pulley 66 is rotated by the power transmission mechanism 40, the abrasive belt 78 rotates along its own circumferential direction, and the driven pulley 72 rotates around the support shaft 74. Therefore, by pressing the middle portion of the lower end of the abrasive belt 78 against the workpiece from above, abrasive processing can be performed on the workpiece. The drive pulley 66, the driven pulley 72, and the abrasive belt 78 correspond to the processing part of the present invention.

[0049] (Regarding belt cover 80) As shown in Figures 1, 2, and 8-10, the belt cover 80, like the side housing 24, is formed in a relatively shallow box shape that opens to the right. The outer shape of the belt cover 80, as viewed from the left, is formed to correspond to the outer shape of the surrounding wall 24H of the side housing 24, and the belt cover 80 extends in a direction that slopes upward as it moves towards the front when viewed from the left. The belt cover 80 is positioned adjacent to the left side of the surrounding wall 24H and is fastened and fixed to the side housing 24. As a result, the surrounding wall 24H is closed by the belt cover 80, and the belt cover 80 covers the motor pulley 54, the transmission pulley 56, and the transmission belt 64 from the left side.

[0050] (Regarding reinforcement section 90) As shown in Figures 5 and 7-10, the reinforcing portion 90 is provided on the bottom wall 24K of the side housing 24. When viewed from the left side, the reinforcing portion 90 is positioned inside the transmission belt 64 and between the motor pulley 54 and the transmission pulley 56. The reinforcing portion 90 extends along the overhead wire L and, when viewed in its longitudinal direction (the direction in which the overhead wire L extends), is formed in a roughly U-shape (concave shape) that opens to the right and protrudes to the left from the side housing 24. That is, the reinforcing portion 90 has a shape in which a part of the plate-shaped side housing 24 bulges to the left. The width dimension of the reinforcing portion 90 is set to increase towards the rear. Specifically, the upper and lower side walls 90A that extend in the longitudinal direction of the reinforcing portion 90 are arranged to be parallel to the transmission belt 64. When viewed in the vertical direction, the reinforcing portion 90 protrudes from the bottom wall 24K to the extent that it partially overlaps with the transmission belt 64. Furthermore, when viewed in the front-to-back direction (or the direction of extension of the overhead wire L), the reinforcing portion 90 protrudes such that at least a part of it overlaps with the motor pulley 54 and the transmission pulley 56. In other words, when viewed in a direction perpendicular to the axial direction of the motor pulley 54 (or transmission pulley 56) (front-to-back or up-and-down direction), at least a part of the reinforcing portion 90 is configured to overlap with the transmission belt 64, or the motor pulley 54, or the transmission pulley 56.

[0051] Furthermore, the upper part of the reinforcing section 90 overlaps with the dust collection air passage section 24B of the side housing 24 when viewed from the left and right directions. That is, the first guide wall 24A intersects the longitudinal middle section of the reinforcing section 90, and the reinforcing section 90 is configured to increase the volume of the dust collection air passage section 24B. An inclined section 90B, which serves as a second guide section, is formed at the front end of the reinforcing section 90, and the inclined section 90B is inclined to the right (away from the motor pulley 54) as it moves outward (forward) in the longitudinal direction of the reinforcing section 90 (the amount of protrusion decreases). The inclined section 90B is located in the fan housing section 24C, and the front end of the inclined section 90B is connected to the left end of the first support cylinder section 24D. As a result, the dust collection air W2 flowing forward inside the reinforcing section 90 is guided to the right by the inclined section 90B and directed towards the fan housing section 24C side (fan 48 side). The inclined section 90B, together with the aforementioned first guide wall 24A, constitutes a guide mechanism 92 that guides the dust collection airflow W2. The rear end of the reinforcing section 90 is connected to the left end of the second support cylinder section 24F. Furthermore, an inclined section 90C is formed at the rear end of the reinforcing section 90, and the inclined section 90C is inclined to the right (away from the transmission pulley 56) as it extends outward (rearward) in the longitudinal direction of the reinforcing section 90.

[0052] Furthermore, the aforementioned belt cover 80 is provided with a pair of upper and lower first cover ribs 80A at positions corresponding to the reinforcing portion 90, and the first cover ribs 80A are positioned to overlap with the reinforcing portion 90 when viewed from the left and right directions (see Figure 5). The first cover ribs 80A extend along the longitudinal direction of the reinforcing portion 90 and protrude to the right from the belt cover 80. Specifically, the pair of first cover ribs 80A are inclined in a direction that separates them from each other toward the rear. Multiple (three in this embodiment) second cover ribs 80B (see Figure 5) are formed between the first cover ribs 80A. The second cover ribs 80B extend along a direction perpendicular to the longitudinal direction of the reinforcing portion 90, and the first cover ribs 80A are connected by the second cover ribs 80B. The first cover ribs 80A and the second cover ribs 80B are positioned adjacent to the left side of the reinforcing portion 90.

[0053] (Regarding conductive tape 110 and conductive plate 120) As shown in Figure 12, conductive tape 110 is provided on the outer periphery of the second fan guide 52. The conductive tape 110 is conductive. The conductive tape 110 is made of aluminum. Adhesive is applied to one side of the conductive tape 110. The conductive tape 110 is fixed to the second fan guide 52 by attaching one side of the conductive tape 110 with the adhesive applied to the outer periphery of the second fan guide 52. The conductive tape 110 is provided on the entire outer periphery of the second fan guide 52, except for the area of ​​the opening 52B. An extension portion 110a is provided at one end of the conductive tape 110. The extension portion 110a is part of the conductive tape 110 and extends inward from the outer periphery of the second fan guide 52. The extension portion 110a is the part that extends in a direction intersecting the circumferential direction of the second fan guide 52. Although not shown in the figure, the extension portion 110a has a large area portion and a small area portion.

[0054] As shown in Figure 12, the belt sander 10 has a conductive plate 120. The conductive plate 120 is mostly located inside the side housing 24. The conductive plate 120 is made by processing a metal plate by pressing or the like. The conductive plate 120 is bent at its center in the front-rear direction. The conductive plate 120 has a vertical wall portion 120a at the front. The vertical wall portion 120a is a flat plate portion that extends in the front-rear, up-down, and rear directions. The front end portion of the vertical wall portion 120a is in contact with the extension portion 110a. The left side of the vertical wall portion 120a abuts against the side housing 24, and the right side abuts against the second fan guide 52. That is, the vertical wall portion 120a is held in place by being sandwiched between the side housing 24 and the second fan guide 52 in the left-right direction. The conductive plate 120 has a bent portion 120b at the rear. The bent portion 120b is the part of the conductive plate 120 whose rear end is bent upward, and its upper side has a mountain-like shape. The bent portion 120b engages with the engaged portion 24J. That is, the conductive plate 120 is held by the belt sander 10 by its front end being sandwiched and held by the side housing 24 and the second fan guide 52, and by its rear end engaging with the engaged portion 24J. The bent portion 120b is interposed between the discharge cylinder portion 24E and the dust collection attachment in the vertical direction (radial direction of the discharge cylinder portion 24E), and is configured to connect them. Because the upper end of the bent portion 120b is mountain-like, it can be elastically deformed by the connected dust collection attachment, thereby maintaining a suitable connection between the discharge cylinder portion 24E and the dust collection attachment.

[0055] (Effects and Benefits) During polishing with the belt sander 10 configured as described above, the operator pulls the trigger 34 of the belt sander 10, which drives the motor 42. The power transmission mechanism 40 transmits the driving force of the motor 42 to the drive pulley 66, causing the polishing belt 78 to rotate circumferentially. This presses the lower surface of the polishing belt 78 against the workpiece, thereby performing polishing on the workpiece.

[0056] Furthermore, when the motor 42 is driven, the fan 48 rotates together with the drive shaft 42A of the motor 42. As a result, the cooling fan section 48B of the fan 48 generates cooling air W1, and the dust collection fan section 48C of the fan 48 generates dust collection air W2.

[0057] Specifically, cooling air W1 is generated and flows into the controller housing section 22C from the intake port 22G of the housing 20. The cooling air W1 that flows into the controller housing section 22C flows to the left inside the motor housing section 22H and is drawn into the cooling fan section 48B. As a result, the controller 30 and the motor 42 are cooled by the cooling air W1.

[0058] Meanwhile, as the dust collection fan unit 48C rotates, a dust collection airflow W2 is generated in the dust collection air passage 24B and suction chamber 22D of the housing 20, flowing toward the dust collection fan unit 48C. Specifically, air from within the machining recess 22A of the main housing 22 flows from the suction port 22D1 into the suction chamber 22D, generating a dust collection airflow W2 that flows from the machining recess 22A into the suction chamber 22D. In addition, dust generated during polishing is stirred up at the rear end of the polishing belt 78. As a result, the dust collection airflow W2 containing dust flows into the suction chamber 22D from the suction port 22D1. The dust collection airflow W2 that flows into the suction chamber 22D passes through the dust collection air passage 24B of the side housing 24, passes through the communication hole 52A of the second fan guide 52, and flows into the dust collection fan unit 48C. The dust-collecting air W2 that flows into the dust-collecting fan section 48C flows radially outward from the dust-collecting fan section 48C, passes inside the discharge pipe section 24E, and is exhausted to the rear from the rear end of the discharge pipe section 24E. Therefore, the dust generated during the polishing process is discharged from the discharge pipe section 24E and collected in the dust box 100 or the like.

[0059] Incidentally, in the belt sander 10, the motor pulley 54 and the transmission pulley 56 are supported by a resin side housing 24, and a transmission belt 64 is stretched over the motor pulley 54 and the transmission pulley 56. That is, a compressive force acts on the side housing 24 along the overhead wire L due to the tension of the transmission belt 64 stretched over the motor pulley 54 and the transmission pulley 56. Therefore, if the side housing 24 is deformed by this compressive force, its support performance for the motor pulley 54 and the transmission pulley 56 will decrease, which may affect the operation of the belt sander 10. In this case, the workability of the belt sander 10 may decrease.

[0060] Here, the side housing 24 is provided with a reinforcing portion 90, which protrudes from the side housing 24 to one axial side (left side) of the motor pulley 54 and the transmission pulley 56. Specifically, the reinforcing portion 90 extends along the overhead wire L that passes through the axis of the motor pulley 54 and the axis of the transmission pulley 56, protruding to the left from the side housing 24 and being formed in a concave shape (U-shape) that opens to the right when viewed from its longitudinal direction. Therefore, the portion of the side housing 24 between the first support cylinder portion 24D and the second support cylinder portion 24F can be reinforced by the reinforcing portion 90. In addition, when viewed in the vertical direction, the reinforcing portion 90 protrudes from the bottom wall 24K to the extent that it partially overlaps with the transmission belt 64. Also, when viewed in the front-rear direction (or the direction in which the overhead wire L extends), the reinforcing portion 90 protrudes so that at least a part of it overlaps with the motor pulley 54 and the transmission pulley 56. In other words, when viewed in a direction perpendicular to the axial direction of the motor pulley 54 (or transmission pulley 56) (front-to-back or up-and-down direction), at least a portion of the reinforcing portion 90 is configured to overlap with the transmission belt 64, or the motor pulley 54, or the transmission pulley 56. This makes effective use of the belt tensioning space, which was previously dead space, and also improves the strength of the side housing 24. Therefore, compared to the case where the reinforcing portion 90 is omitted in the side housing 24, the bending rigidity of the side housing 24 in the left-to-right direction can be increased. As a result, the belt sander 10 can be operated smoothly while maintaining good support for the motor pulley 54 and the transmission pulley 56 by the side housing 24. Thus, the workability of the belt sander 10 can be improved. Furthermore, in order to improve dust collection efficiency as described later, in this embodiment the reinforcing portion 90 is shaped to protrude on one side (left side) and be concave on the other side (right side). However, if the sole purpose is to improve strength, it is not necessary to provide a concave shape, and the strength of the side housing 24 can be improved simply by using ribs that extend in the direction of belt tensioning.

[0061] Furthermore, the side housing 24 is made of resin. This makes it possible to reduce the weight of the belt sander 10 while maintaining good weight balance in the left-right direction. That is, for example, by making the side housing 24 out of metal, the bending rigidity of the side housing 24 can be increased, improving its support performance for the motor pulley 54 and the transmission pulley 56. However, if the side housing 24 is made of metal, the weight of the side housing 24 and the belt sander 10 will increase. Also, since the side housing 24 forms the left end of the housing 20, the weight balance of the belt sander 10 in the left-right direction may worsen. Specifically, the side housing 24 is located to the left of the polishing belt 78. As a result, in a belt sander 10 that performs polishing by pressing the polishing belt 78 against the workpiece from above, the amount of polishing by the left side of the polishing belt 78 will be greater than the amount of polishing by the right side of the polishing belt 78. For this reason, in order to make the amount of polishing uniform in the left-right direction, the operator will need to correct the posture of the belt sander 10 while working, which may worsen the workability of the belt sander 10. In contrast, in this embodiment, the side housing 24 is made of resin, which allows for weight reduction of both the side housing 24 and the belt sander 10. Furthermore, by making the side housing 24 of resin, the weight balance of the belt sander 10 in the left-right direction can be improved, while the amount of polishing performed by the polishing belt 78 on the workpiece can be made uniform in the left-right direction. Therefore, the workability of the belt sander 10 can be further improved.

[0062] Furthermore, the upper part of the side housing 24 is configured as a dust collection air passage section 24B through which the dust collection airflow W2 generated by the fan 48 (dust collection fan section 48C) passes. In addition, the reinforcing section 90 is positioned to overlap with the dust collection air passage section 24B and protrudes from the side housing 24 to the left (opposite side from the dust collection air passage section 24B), expanding the dust collection air passage section 24B. This reduces the flow resistance for the dust collection airflow W2 flowing through the dust collection air passage section 24B. As a result, the dust collection airflow W2 can be flowed smoothly toward the fan 48 and discharged from the discharge cylinder section 24E. Therefore, the dust collection efficiency of the fan 48 can be increased. In Figure 10, the movement of the dust collection airflow W2 is simplified, but as described above, the dust collection airflow W2 is configured to pass through the space expanded by the reinforcing section 90 (recess). Therefore, the dust collection air W2 from the suction chamber 22D is configured to move to the left, pass through the reinforcing section 90 (recess), then move to the right to reach the inside of the second fan guide 52, and from there move to the left to reach the discharge pipe section 24E.

[0063] Furthermore, the reinforcing section 90 is formed in a concave shape (U-shape) that opens towards the dust collection air passage section 24B when viewed from its longitudinal direction. As a result, the upper and lower side walls 90A extending in the longitudinal direction of the reinforcing section 90 function as guide walls that guide the dust collection air W2 within the reinforcing section 90 toward the fan 48. Therefore, the dust collection air W2 within the reinforcing section 90 can be effectively directed toward the fan 48.

[0064] Furthermore, the reinforcing portion 90 is positioned inside the transmission belt 64 when viewed from the left side. Therefore, the reinforcing portion 90 can be provided in the side housing 24 by effectively utilizing the space inside the transmission belt 64.

[0065] Furthermore, the width dimension of the reinforcing section 90 is set to increase as it moves towards the rear. That is, the outer surfaces (top and bottom) of the side wall 90A of the reinforcing section 90 are arranged parallel to the transmission belt 64. This makes it possible to enlarge the outer shape of the reinforcing section 90 when viewed from the left and right directions, compared to when the width dimension of the reinforcing section 90 is set to be constant at the front end. This effectively increases the bending rigidity of the side housing 24 and effectively increases the volume of the dust collection air passage section 24B. In order to make the outer shape of the reinforcing section 90 as large as possible, the outer surfaces (top and bottom) of the side wall 90A are set to be parallel to the transmission belt 64, but it is also acceptable to configure it so that the width gradually or in stages increases towards the rear (transmission pulley 56 side). This makes it easy to enlarge the reinforcing section 90 by effectively utilizing the tensioning space of the transmission belt 64.

[0066] Furthermore, a first guide wall 24A is formed inside the side housing 24. The first guide wall 24A extends in the front-rear direction, with the vertical direction being the plate thickness direction. This allows the dust collection air W2 flowing into the dust collection air passage 24B to be guided forward by the first guide wall 24A and flow smoothly toward the fan 48. In addition, the first guide wall 24A can reinforce the side housing 24. This further increases the bending rigidity of the side housing 24.

[0067] Furthermore, the vertical position of the first guide wall 24A is approximately aligned with the lower wall of the suction chamber 22D in the main housing 22, and the first guide wall 24A constitutes the lower wall of the dust collection air passage 24B. Therefore, it is possible to suppress the accumulation of dust in the lower part of the side housing 24 as it flows into the side housing 24 by the dust collection air W2.

[0068] Furthermore, the first guide wall 24A intersects with the longitudinal middle portion of the reinforcing section 90. This allows the first guide wall 24A to also reinforce the reinforcing section 90. Therefore, the bending rigidity of the side housing 24 can be effectively increased.

[0069] Furthermore, an inclined portion 90B is provided at the front end of the bottom wall of the reinforcing portion 90, and the inclined portion 90B slopes to the right as it extends outward in the longitudinal direction of the reinforcing portion 90. This allows the dust collection air W2 that flows into the reinforcing portion 90 to be guided toward the fan housing portion 24C by the inclined portion 90B. Therefore, the dust collection air W2 can be directed toward the fan housing portion 24C more effectively.

[0070] Furthermore, the inclined section 90B is provided in the fan housing section 24C, and the front end of the inclined section 90B is connected to the left end of the first support cylinder section 24D. This allows the dust collection air W2 to be effectively directed towards the fan 48.

[0071] Furthermore, inclined portions (inclined portions 90B, 90C) are provided at the ends of the reinforcing portion 90. This configuration allows the reinforcing portion (protrusion) 90 to be positioned close to the two pulleys while suppressing interference between the motor pulley 54 or the transmission pulley 56 and the reinforcing portion 90, and further improving durability through its length.

[0072] Furthermore, the belt cover 80, which covers the motor pulley 54, the transmission pulley 56, and the transmission belt 64, is provided with a first cover rib 80A and a second cover rib 80B, which are positioned adjacent to the left side of the reinforcing portion 90. Therefore, for example, when the belt cover 80 bends to the right (towards the side housing 24), the first cover rib 80A and the second cover rib 80B come into contact with the reinforcing portion 90, allowing the reinforcing portion 90 to support the belt cover 80 from the left side. In other words, the protruding reinforcing portion 90 directly or indirectly contacts the belt cover 80, thereby suppressing deformation of the belt cover 80. Consequently, even if the belt cover 80 is subjected to impact, for example, when it is dropped, the reinforcing portion 90 can suppress deformation of the belt cover 80 and prevent damage to the belt cover 80. This ultimately improves the durability of the belt cover 80. Therefore, the overall rigidity of the belt sander 10 can be increased by the reinforcing section 90, which increases the bending rigidity of the side housing 24 and improves the dust collection efficiency against dust.

[0073] Furthermore, the conductive tape 110 and the conductive plate 120 allow static electricity to be discharged to the dust collection attachment. As described above, this embodiment can improve dust collection efficiency, but when dust collection efficiency is increased, dust flows at high speed, making it easy for static electricity to be generated due to friction between the resin part and the dust. If static electricity accumulates, it may adversely affect the internal electronic components. Therefore, in this embodiment, by providing the conductive tape 110 on the outer circumference of the second fan guide 52, which is particularly prone to static electricity generation, the static electricity (charge) accumulated in the second fan guide 52 can be moved via the conductive tape 110. In addition, the conductive plate 120 (vertical wall portion 120a) is connected to the extension portion 110a provided at the end of the conductive tape 110, allowing the static electricity accumulated in the second fan guide 52 to be moved to the conductive plate 120. A bent portion 120b is provided at the rear end of the conductive plate 120, and the dust collection attachment is connected to the bent portion 120b. Therefore, static electricity accumulated in the second fan guide can be discharged to the dust collection attachment. In this embodiment, a flexible tape-like conductive tape 110 and a conductive plate 120, which is a metal plate with a rigid nature, are combined to move the static electricity. In other words, a conductive configuration for static electricity is constructed by combining materials with different flexibility. By doing so, a highly flexible conductive material can be placed in circular shapes such as the fan guide, and a less flexible material can be used for linear conductivity, thereby allowing for optimal movement of static electricity. In addition, since the conductive plate 120 is connected to the dust collection attachment, a rigid material is advantageous. In particular, in this embodiment, the elasticity of the conductive plate 120 is used for connection to the dust collection attachment and for moving static electricity, so a rigid material such as a metal plate is preferable to tape.

[0074] In this embodiment, the amount of protrusion of the reinforcing portion 90 to the left from the side housing 24 can be set arbitrarily. For example, as shown in Figure 11, the first cover rib 80A and the second cover rib 80B may be omitted in the belt cover 80, and the amount of protrusion of the reinforcing portion 90 may be set so that the reinforcing portion 90 is positioned adjacent to the right side of the belt cover 80. This makes it possible to more effectively increase the bending rigidity of the side housing 24 and to more effectively increase the volume of the dust collection air passage portion 24B in the side housing 24. Also, in this case, since the reinforcing portion 90 is positioned adjacent to the right side of the belt cover 80, the overall rigidity of the belt sander 10 can be increased, as described above. [Explanation of Symbols]

[0075] 10. Belt Sander (Work Machine) 22 Main housing (housing section) 22D Suction chamber 24 Side housing (support member) 24A First guide wall (first guide section) 24B Dust collection air passage section (passage section) 24C Fan housing 24D 1st support cylinder part (1st support part) 24F 2nd support cylinder part (2nd support part) 40 Power transmission mechanism 42 motors 48 Fans 54 Motor pulley (first pulley) 56 Transmission pulley (second pulley) 64. Transmission belt (belt) 66 Drive pulley (machined part) 72 Driven pulley (machined part) 78. Abrasive belt (processing part) 80 Belt cover (cover component) 90 Reinforcement section 90B Inclined section (second guide section) 92 Guide mechanism L Overhead line W2 Dust collection airflow

Claims

1. A power transmission mechanism including a motor, a first pulley, a second pulley, and a belt stretched between the first and second pulleys, The main housing that houses the motor, A fan that rotates to generate airflow by the drive of the motor, Support members that support the first pulley and the second pulley, A reinforcing portion is provided on the support member, protruding in the axial direction of the first pulley, and extending along an overhead line connecting the axis of the first pulley and the axis of the second pulley when viewed from the axial direction, Equipped with, The main body housing has an opening that is open in the axial direction of the first pulley, and the support member is connected to the main body housing so as to close the opening. The support member and the main housing form a passage through which the airflow passes. The fan is located inside the passage section, The reinforcing portion is formed in a concave shape that opens toward the passage portion when viewed in the direction of extension of the overhead line, and the work machine is configured such that the airflow passes through the inside of the passage portion which has been expanded by the reinforcing portion.

2. A power transmission mechanism including a first pulley, a second pulley, and a belt stretched between the first and second pulleys, Support members that support the first pulley and the second pulley, A reinforcing portion is provided on the support member, protruding in the axial direction of the first pulley, and extending along an overhead line connecting the axis of the first pulley and the axis of the second pulley when viewed from the axial direction, Equipped with, The outer diameter of the second pulley is set to be larger than the outer diameter of the first pulley. A work machine in which the reinforcing portion gradually or stepwise expands toward the second pulley in a direction perpendicular to both the axial direction and the direction of extension of the overhead line.

3. It has a machining section that operates by the driving force transmitted from the power transmission mechanism to process the workpiece, The work machine according to claim 1, wherein the airflow is a dust-collecting airflow for collecting dust generated during processing.

4. The first pulley, the second pulley, and the belt are positioned on one side in the axial direction with respect to the support member. The reinforcing portion protrudes from the support member toward one side in the axial direction. The work machine according to claim 1 or claim 2, wherein, when viewed from the axial direction, the reinforcing portion is located between the first pulley and the second pulley and inside the belt.

5. The work machine according to claim 1, wherein the first pulley and the fan are provided to be rotatably integrated with the drive shaft of the motor.

6. The outer diameter of the second pulley is set to be larger than the outer diameter of the first pulley. The work machine according to claim 1, wherein the reinforcing portion gradually or stepwise expands toward the second pulley in a direction perpendicular to both the axial direction and the direction of extension of the overhead line.

7. The work machine according to claim 1, wherein the support member is provided with a guide mechanism for guiding the flow of the airflow.

8. The main body housing has a suction chamber that draws in air from outside the main body housing by the airflow, The aforementioned passage is in communication with the suction chamber. A fan housing section for housing the fan is provided at one end of the passage section in the front-rear direction. The work machine according to claim 7, wherein the guide mechanism has a first guide portion that extends in the front-rear direction and guides the airflow toward the fan.

9. The work machine according to claim 8, wherein the first guide section constitutes the lower wall of the passage section.

10. The work machine according to claim 9, wherein, when viewed from the left and right directions, the first guide portion intersects with the longitudinal intermediate portion of the reinforcing portion.

11. The first pulley and the second pulley are configured to be rotatable about the left-right axis, The reinforcing portion protrudes from the support member to one side in the left-right direction. The work machine according to claim 8, wherein the guide mechanism has a second guide portion provided on the reinforcing portion, and the second guide portion guides the airflow to the other side in the left-right direction.

12. The work machine according to claim 11, wherein the second guide portion is located in the fan housing portion.

13. The processing section is, A drive pulley that rotates due to the driving force transmitted from the power transmission mechanism, A driven pulley positioned parallel to the aforementioned drive pulley, An abrasive belt is stretched over the drive pulley and the driven pulley, and rotates circumferentially as the drive pulley rotates, On the other hand, the work machine according to claim 3.

14. The support member is fitted with a first pulley, a second pulley, and a cover member that covers the belt. The work machine according to claim 1, wherein a part of the cover member is arranged adjacent to the reinforcing portion in the direction of protrusion of the reinforcing portion.

15. The work machine according to claim 1 or claim 2, wherein, when viewed in a direction perpendicular to the axial direction, at least a portion of the reinforcing portion is configured to overlap with the first pulley or the second pulley or the belt.

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