JP7482569B1 - Arm support device for polishing machine - Google Patents

Abstract

[Problem] To reduce arm fatigue of a polishing worker. [Solution] An arm support device 30 is used when the polished object PO is pressed against the polishing surface 15a on the outer periphery of an endless belt 15 that moves in a circular motion with the rotation of a disc-shaped buff 14 in a buffing machine 10 during polishing of the surface of the polished object PO. The arm support device 30 comprises a pair of arm rests 31 as an arm rest section, and a pair of support mechanisms 35 as a support section. Each arm rest 31 is a location on which each arm AR is placed when a polishing worker W1 in a standing position presses the polished object PO held by both hands HA against the polishing surface 15a. Each support mechanism 35 is attached to a stand located below the buffing machine 10 as a mounting section, and supports the arm rests 31. [Selected Figure] Fig. 9

Description

The present invention relates to an arm support device for a grinder.

A buff polishing machine in which a disk-shaped buff with a polishing surface on its outer periphery is rotated is known as a device for polishing the surface of a workpiece such as a casting. A buff polishing machine in which an endless belt with a polishing surface on its outer periphery moves in a circle as the buff rotates is also known. When polishing the surface of an workpiece using the former buff polishing machine, the polisher holds the workpiece in both hands and presses it against the polishing surface of the buff. When polishing using the latter buff polishing machine, the polisher holds the workpiece in both hands and presses it against the polishing surface of the belt that moves in a circle.

Patent Documents 1 and 2 describe a disk-shaped buff that has an abrasive surface on its outer periphery and is rotated around an axis.

JP 2010-156247 A Japanese Utility Model Application Publication No. 5-80661

However, when a polisher performs polishing work in a standing position using a buff polishing machine equipped with the buffs described in Patent Documents 1 and 2, or a buff polishing machine equipped with an endless belt in addition to the buff, the following problems arise. When polishing, a polisher in a standing position simultaneously holds the object to be polished and presses it against the polishing surface. As a result, the arms get tired over time and the arm position becomes unstable. In addition, the polisher's back and neck become bent, making the polishing position unstable, which causes further arm fatigue.

The arm support device for a polishing machine to solve the above problem is a device used when the workpiece is pressed against the polishing surface on the outer circumference of a rotating disc-shaped buff in a buffing machine, or when the workpiece is pressed against the polishing surface on the outer circumference of an endless belt that moves in a circular motion as the buff rotates, during polishing of the surface of the workpiece. The device is equipped with an arm rest on which both arms of a polishing worker in a standing position are placed when the polishing worker presses the workpiece held in both hands against the polishing surface, and a support part that is attached to the attachment part, with at least one of the buffing machine and the equipment surrounding the buffing machine as the attachment part, and supports the arm rest part.

This invention reduces arm fatigue for polishers.

1 is a perspective view of an arm support device according to a first embodiment. FIG. FIG. 2 is a partial perspective view of a support mechanism portion on the right side in FIG. 1 . FIG. 2 is a partial perspective view showing a lower structure of the arm support device in FIG. 1 . 2 is a right side view of the support mechanism portion on the right side in FIG. 1 . 2 is a partial perspective view showing a lower structure of the right support mechanism in FIG. 1 . 6 is a partial perspective view of the lower structure of FIG. 5 as seen from the back side of FIG. 5 . 13 is a partial perspective view of the receiving surface angle adjustment unit that adjusts the angle of the receiving surface. FIG. 6 is a partial front view of the receiving surface angle adjustment portion and the receiving body position adjustment portion of FIG. 5 . FIG. 2 is a partial perspective view showing how the arm support device of the first embodiment is used. FIG. 2 is a partial perspective view showing how the arm support device of the first embodiment is used. FIG. 11 is a partial front view of an arm support device according to a second embodiment. This is a cross-sectional view taken along line 12-12 of Figure 11. FIG. 11 is a left side view of the left support mechanism in the second embodiment. 12 is a partial plan view of the left support mechanism in FIG. 11 . FIG. 12 is a partial perspective view illustrating a manner in which the arm support device of FIG. 11 is used.

First Embodiment
Hereinafter, a first embodiment of an arm support device for a grinder (hereinafter simply referred to as an "arm support device") will be described with reference to FIGS. 1 to 10. FIG.

As shown in Figures 1 and 9, the arm support device 30 is a device used when a polishing worker W1 buffs the surface of an object to be polished PO with a buff polishing machine 10. The buff polishing machine 10 has a rotating shaft 12 that is driven to rotate by a motor 11. A disk-shaped buff 14 having a polishing surface 14a on its outer periphery is attached to the rotating shaft 12 so that it can rotate together with the rotating shaft 12. The surface of the object to be polished PO can be buffed by pressing the object to be polished against the polishing surface 14a. Materials used for the buff 14 include cotton, linen, wool, sponge, etc. The buff 14 is formed by applying an abrasive to these materials.

In addition, an endless belt 15 having an abrasive surface 15a on its outer periphery may be stretched around each of the disc-shaped rotating bodies, including the buff 14, and the belt 15 may move in a circular motion as the buff 14 rotates. In this case, the surface can be buffed by pressing the workpiece PO against the abrasive surface 15a. Note that Figures 1 and 9 show the case where buffing is performed using the belt 15.

Here, in order to identify each part of the buff polishing machine 10 and the arm support device 30, the horizontal direction in which the buff 14 and the polishing worker W1 who presses the workpiece PO against the polishing surfaces 14a, 15a face each other is defined as the "front-to-back direction." Additionally, the direction perpendicular to both the front-to-back direction and the vertical direction is defined as the "left-to-right direction." The front-to-back and left-to-right directions are defined based on the polishing worker W1. For example, the direction in which the polishing worker W1 is facing is "forward," the right side of the polishing worker W1 is "right," and the left side is "left."

In the buffing machine 10, the rotating shaft 12 extends in the left-right direction. The buff 14, which is in an upright position, is attached to the rotating shaft 12 at its center. The buffing machine 10 is provided with a tray 16 below the buff 14. The tray 16 is a container for collecting shavings called buff powder, abrasives, etc. that fall during polishing. The tray 16 is box-shaped with an open top and a bottom, and has a hole 17. Powder that falls onto the tray 16 is sucked through the hole 17 and discharged outside the tray 16.

As shown in Figures 1 and 3, a stand 21 is disposed below the buffing machine 10 as one aspect of the equipment surrounding the buffing machine 10. The stand 21 is a structure on which the buffing machine 10, which is a heavy object, is installed. The stand 21 is constructed by connecting multiple pillars 22 and multiple beams 23.

The object to be polished PO, indicated by the two-dot chain line in FIG. 1, is the object to be buffed. The object to be polished PO is made of metal materials such as bronze, brass, copper, iron, stainless steel, aluminum, titanium, etc. Note that objects made of resin materials can also be the object to be polished PO. In addition, the object to be polished PO here is an object that has a size and shape that allows the polishing worker W1 shown in FIG. 9 to hold it with both hands HA and press it from behind the buff 14 against the polishing surfaces 14a, 15a.

As shown in FIGS. 1 and 9, the arm support device 30 includes an arm rest portion and a support portion.
<Arm rest body 31>
The arm rest portion includes a pair of arm rest bodies 31 on which both arms AR of the polishing worker W1 are respectively placed. Both arm rest bodies 31 have the same configuration. As shown in Figures 2 and 4, each arm rest body 31 includes a disk-shaped arm rest main body 32 and a cylindrical spring mounting part 33 disposed below the arm rest main body 32 and fixed to the arm rest main body 32.

<Support mechanism unit 35>
As shown in Fig. 1, the support section includes a pair of support mechanisms 35 provided for each of the arm rests 31. Each support mechanism 35 is attached to the base 21, with the base 21 being the attachment portion. Each support mechanism 35 is configured by connecting a plurality of members, and has the function of supporting each arm rest 31. Each support mechanism 35 has the same configuration as the others. More precisely, a vertical plane extending in the front-rear and up-down directions is set in the center between both arm rests 31 in the left-right direction, and this is set as a symmetry plane 36. Each component of the pair of support mechanisms 35 is arranged so as to be symmetrical with respect to the symmetry plane 36.

Here, in order to identify each part of each support mechanism part 35, the side closer to the buff 14 in the left-right direction will be referred to as the "inner" or "inside" etc., and the side farther from the buff 14 will be referred to as the "outer" or "outside" etc.

As shown in Figures 1 and 3, each support mechanism 35 includes a pair of rail mounting parts 37, 41, a rail 45, a support post 51, a receiving body 55, a coil spring 61, a guide post 65, and a cylindrical body 71. Note that in Figure 3, the components above the receiving body 55's bottom portion, the receiving body main body 56 (see Figure 5, etc.), such as the coil spring 61 and the cylindrical body 71, are omitted from the illustration.

[Rail mounting parts 37, 41]
As shown in Fig. 3, both rail mounting parts 37, 41 are removably attached to the frame 21. More specifically, the frame 21 includes a lower beam 23L extending in the left-right direction as part of the multiple beams 23. The frame 21 also includes an upper beam 23U extending in the left-right direction above the lower beam 23L as part of the multiple beams 23. Furthermore, the frame 21 includes an auxiliary column 22S extending diagonally upward and rearward from the lower beam 23L as part of the multiple columns 22.

The rail mounting portion 37 is located adjacent to the rear side of the upper beam 23U and extends in the left-right direction. This rail mounting portion 37 is fastened to the upper beam 23U from the rear by a bolt (not shown) or the like. The rail mounting portion 41 is located behind the rail mounting portion 37 and extends in the left-right direction. The rail mounting portion 41 is fastened to the upper end of the auxiliary column 22S by a bolt 42.

In the first embodiment, the rail attachment parts 37, 41 are configured by members common to both support mechanism parts 35, but they may be configured by separate members.
[Rail 45]
3 and 5, the rail 45 has a bottom plate portion 45b extending in the front-rear direction with the plate thickness direction being the up-down direction, and a wall plate portion 45w extending in the front-rear direction with the plate thickness direction being the left-right direction. The lower edge of the wall plate portion 45w is connected to one side edge portion in the left-right direction of the bottom plate portion 45b. With this configuration, the rail 45 has an L-shaped (angle-shaped) cross section.

The front of the bottom plate portion 45b is placed on the rail mounting portions 37, 41. A number of bolts 46 are inserted through the bottom plate portion 45b and the rail mounting portion 37. These bolts 46 extend vertically while being spaced apart from each other in the front-to-rear direction. The bolts 46 are screwed into nuts (not shown) arranged on the underside of the rail mounting portion 37, thereby fastening the rail 45 to the rail mounting portion 37.

Similarly, a bolt 47 extending in the vertical direction is inserted through the bottom plate portion 45b and the rail mounting portion 41. The bolt 47 is screwed into a nut (not shown) disposed on the underside of the rail mounting portion 41, thereby fastening the rail 45 to the rail mounting portion 41.

[Support 51]
As shown in Fig. 2, the support pillar 51 is disposed adjacent to the outer side in the left-right direction of the wall plate portion 45w of the rail 45. The support pillar 51 is formed of a plate-like body extending in the up-down direction with the left-right direction being the plate thickness direction. A plurality of bolts 52 are inserted into the wall plate portion 45w. These bolts 52 extend in the left-right direction while being spaced apart from each other in the front-rear direction. The bolts 52 are screwed into the lower end portion of the support pillar 51, whereby the support pillar 51 is fastened to the rail 45.

[Receiver 55]
2, 5 and 6, the receiving body 55 is located at a position spaced downward from the arm rest 31 and is disposed outside the support column 51 in the left-right direction. The receiving body 55 includes a receiving body portion 56 and a holding plate portion 57, both of which are plate-shaped. The upper surface of the receiving body portion 56 is formed flat and constitutes a receiving surface 56r with which the lower end portion, which is the other end portion of the coil spring 61, comes into contact.

The retaining plate 57 extends in a direction intersecting the receiving surface 56r (hereinafter referred to as the "intersecting direction"), which is the perpendicular direction in the first embodiment, with the left-right direction being its plate thickness direction. The lower end of the retaining plate 57 is fixed to the inner edge of the receiving body 56 in the left-right direction. The retaining plate 57 is fastened to the support 51 by a bolt 58 extending in the left-right direction.

[Coil spring 61]
The coil spring 61 has a central axis CL that extends between the arm rest 31 and the receiving body 56 in a direction connecting them. The coil spring 61 is configured by being wound in a spiral shape around the central axis CL. The coil spring 61 is elastically deformable in a direction along the central axis CL and in a radial direction according to a load. The radial direction is a radial direction centered on the central axis CL.

One end of the coil spring 61, the upper end, is attached to the arm rest 31 by being wound around the outer circumference of the spring mounting part 33. A pressing plate 62 extending in a direction along the receiving surface 56r is disposed between the coil part at the lower end of the coil spring 61 and the adjacent coil part above it. This pressing plate 62 is fastened to the receiving body part 56 by a bolt 63. The other end of the coil spring 61, the lower end, is attached to the receiving body part 56 by the pressing plate 62 and the bolt 63.

[Guide column 65]
As shown in Figures 1, 2 and 4, the guide column 65 includes a column body 66 and an attachment portion 67 each having a plate shape. The column body 66 is located on the opposite side of the support column 51 across the coil spring 61. In other words, the column body 66 is located on the radially outer side of the coil spring 61 together with the support column 51. The column body 66 extends in the cross direction, which is the orthogonal direction in the first embodiment, with the left-right direction being its own plate thickness direction. The attachment portion 67 is connected to the lower end of the column body 66. The attachment portion 67 is placed on the lower side of the receiving body 56 and attached to the receiving body 56 by a bolt 68.

[Cylindrical body 71]
The cylindrical body 71 has a cylindrical shape with the central axis CL as its axis. The cylindrical body 71 has an inner diameter slightly larger than the outer diameter of the coil of the coil spring 61. The cylindrical body 71 is disposed around a portion of the coil spring 61 in the direction along the central axis CL. A plurality of bolts 72 are inserted into the column main body 66. These bolts 72 extend in the left-right direction while being spaced apart from each other in the up-down direction. By screwing the bolts 72 into the cylindrical body 71, the cylindrical body 71 is attached to the guide column 65 in a state in which rotation around the bolts 72 is restricted.

As shown in Figures 2 to 4, each support mechanism 35 further includes various adjustment units, including a receiving surface angle adjustment unit A1, a receiving body position adjustment unit A2, a cylindrical body position adjustment unit A3, a support position adjustment unit A4, and a rail position adjustment unit A5.

[Receiving surface angle adjustment unit A1 and receiving body position adjustment unit A2]
5, 6 and 8, the receiving surface angle adjustment unit A1 is for adjusting the angle that the receiving surface 56r forms with respect to the vertical plane. The receiving body position adjustment unit A2 is for adjusting the mounting position of the receiving body 55 in the vertical direction with respect to the support 51. Both the receiving surface angle adjustment unit A1 and the receiving body position adjustment unit A2 are provided between the base 21 and the receiving body 55, more specifically, between the support 51 and the receiving body 55.

The receiving surface angle adjustment unit A1 and the receiving body position adjustment unit A2 are configured by a common mechanism. The support 51 has a long hole 53 extending in the vertical direction. The bolt 58 is inserted into the long hole 53 and screwed into the holding plate 57. By loosening the bolt 58 and changing the vertical position in the long hole 53, the mounting position of the receiving body 55 in the vertical direction relative to the support 51 can be adjusted. In addition, when the bolt 58 is in a loosened state, the receiving body 55 can rotate around the bolt 58. As the receiving body 55 rotates, the angle that the receiving surface 56r makes with respect to the vertical plane changes. By tightening the bolt 58, the vertical movement of the bolt 58 is restricted to a certain extent, and the rotation of the receiving body 55 around the bolt 58 is restricted to a certain extent.

An adjustment tool 73 having a base 73a and a clamping portion 73b is disposed adjacent to the outer side of the support 51 in the left-right direction. The dimension of the base 73a in the front-rear direction is set to be larger than the width of the long hole 53. The dimension of the base 73a in the left-right direction is set to be larger than the plate thickness of the holding plate 57. The clamping portion 73b extends downward from a portion of the base 73a that is a distance from the support 51 that is approximately the same as the plate thickness of the holding plate 57. The lower end of the clamping portion 73b and the support 51 can clamp the holding plate 57 from both the left and right sides.

A bolt 74 extending in the left-right direction is inserted into the long hole 53 above the bolt 58. The bolt 74 is screwed into the clamping portion 73b at a point above the holding plate portion 57. This screwing presses the lower end of the clamping portion 73b against the holding plate portion 57 toward the support 51, restricting the above-mentioned rotation of the receiving body 55 around the bolt 58. It also restricts the movement of the bolt 58 in the up-down direction.

In addition, by loosening the bolt 74, the bolt 74 can be moved up and down along the long hole 53 to adjust the vertical position of the adjustment tool 73. In addition, by loosening the bolt 74, the lower end of the clamping portion 73b is no longer pressed against the holding plate portion 57, and it becomes possible to both rotate the receiving body 55 around the bolt 58 and move the bolt 58 in the vertical direction.

The long hole 53, the bolts 58, 74 and the adjuster 73 constitute the receiving surface angle adjustment section A1 and the receiving body position adjustment section A2.
[Cylindrical body position adjustment unit A3]
As shown in FIG. 4, the cylindrical body position adjustment part A3 is provided between the guide column 65 and the cylindrical body 71 in order to adjust the mounting position of the cylindrical body 71 relative to the column main body 66 in the cross direction of the receiving surface 56r (see FIG. 5, etc.). The column main body 66 is formed with a long hole 69 extending in the cross direction. The above-mentioned multiple bolts 72 are inserted into the long hole 69 and screwed into the cylindrical body 71. When these bolts 72 are loosened, they can move in the cross direction along the long hole 69 together with the cylindrical body 71, as shown in FIG. 9 and FIG. 10. When all the bolts 72 are tightened, the movement in the cross direction together with the cylindrical body 71 is restricted. The long hole 69 and the bolt 72 constitute the cylindrical body position adjustment part A3.

[Support position adjustment section A4]
As shown in Fig. 3 and Fig. 5, the support post position adjustment part A4 is provided between the support post 51 and the rail 45 in order to adjust the mounting position of the support post 51 relative to the rail 45 in the front-rear direction. The wall plate part 45w is formed with a long hole 48 extending in the front-rear direction. Each bolt 52 is inserted into the long hole 48 and screwed into the lower end of the support post 51. When all the bolts 52 are loosened, they can move in the front-rear direction along the long hole 48 together with the support post 51. When all the bolts 52 are tightened, their movement in the front-rear direction together with the support post 51 is restricted. The long hole 48 and the bolt 52 constitute the support post position adjustment part A4. Note that Fig. 3 shows only one of the support mechanism parts 35 in a state after the front-rear position of the support post 51 has been adjusted. The other support mechanism part 35 is shown in a state before the front-rear position of the support post 51 has been adjusted.

[Rail position adjustment unit A5]
As shown in FIG. 3, the rail position adjustment section A5 is provided between the rail mounting sections 37, 41 and the rail 45 in order to adjust the mounting position of the rail 45 relative to the rail mounting sections 37, 41 in the left-right direction.

The rail mounting portion 37 has a plurality of long holes 38 that extend in the left-right direction and are spaced apart from each other in the front-rear direction. Each bolt 46 is inserted into the corresponding long hole 38 and screwed into a nut (not shown) on the lower side of the rail mounting portion 37. Similarly, the rail mounting portion 41 has a long hole 39 that extends in the left-right direction. The bolt 47 is inserted into the long hole 39 and screwed into a nut (not shown) on the lower side of the rail mounting portion 41.

When all of the bolts 46, 47 are loosened, they can move left and right along the long holes 38, 39 along with the rail 45. When all of the bolts 46, 47 are tightened, the left and right movement along with the rail 45 is restricted. The long holes 38, 39 and the bolts 46, 47 form the rail position adjustment section A5.

Next, the operation of the first embodiment configured as described above will be described. Note that, here, a case will be described in which buff polishing is performed by pressing the object to be polished PO against the polishing surface 15a of the belt 15 that moves in a circular motion as the buff 14 rotates.

As shown in Figures 1 and 9, when polishing the object PO, the polisher W1 presses the object PO, which is held in both hands HA, against the polishing surface 15a of the belt 15 from behind the buff 14.

Here, when the polishing worker W1 performing the polishing work in a standing position presses the polished object PO held in both hands HA against the polishing surface 15a, unlike when performing the polishing work in a sitting position, no part of the lower leg, such as the thigh, is located below the arm AR. The polishing worker W1 in a standing position has no part to support the arm AR holding the polished object PO from below.

In this regard, in the first embodiment, arm rests 31 are positioned below both arms AR of the polishing worker W1 who is standing. Both arms AR of the polishing worker W1 are placed on the corresponding arm rests 31. Here, the arms AR are generally referred to as the forearms. The arms AR include the part between the wrist WR and elbow EL, as well as the wrist WR and elbow EL.

The load of each arm AR is transmitted to and received by the cradle 21 via the arm rest 31 and various parts of the support mechanism 35. Each arm AR is supported from below by a coil spring 61 via the arm rest 31. The downward movement of each arm AR is regulated by the arm rest 31, various parts of the support mechanism 35, and the cradle 21. The coil spring 61 elastically deforms in the direction along the central axis CL in response to the load of the arm AR, thereby elastically receiving the load.

As a result, the polisher W1 can position both arms AR at the location for polishing work and hold them there with less force than before. The location for polishing work is the location where the workpiece PO, held with both hands HA, is pressed against the polishing surface 15a from behind the buff 14. Because less force is required to be applied to the arms AR, the various parts of the body of the polisher W1, including the arms AR, are less likely to become fatigued.

Here, the cylindrical body 71 arranged around the outer periphery of the coil spring 61 controls the radial elastic deformation of the coil spring 61. That is, the cylindrical body 71 restricts the portion of the coil spring 61 located between the receiving surface 56r (see FIG. 5, etc.) and the end face (upper end face) of the cylindrical body 71 on the arm rest 31 side from elastically deforming in the radial direction. In contrast, the cylindrical body 71 allows the portion of the coil spring 61 located between the cylindrical body 71 and the arm rest 31 to elastically deform in the radial direction.

Therefore, when a force in the front-back or left-right direction is applied to the arm AR placed on the arm rest 31, the portion of the coil spring 61 located between the cylindrical body 71 and the arm rest 31 is elastically deformed in the radial direction. As a result, the position of the arm rest 31 changes.

Furthermore, by adjusting various adjustment parts in the arm support device 30, the position and inclination of the arm rest 31 can be adjusted. For example, when adjusting the angle of the receiving surface 56r with respect to the vertical plane, or when adjusting the vertical mounting position of the receiving body 55 with respect to the support 51, or when adjusting both, the bolt 74 shown in FIG. 8 is loosened. This weakens the force with which the clamping part 73b presses the holding plate part 57 towards the support 51. In this state, the bolt 58 is loosened.

As shown in FIG. 7, the bolt 58, together with the receiving body 55, the coil spring 61, etc., is moved vertically along the long hole 53. This movement changes the vertical positions of the coil spring 61 and the arm rest 31. The receiving body 55 is also rotated around the bolt 58. This rotation changes the angle that the coil spring 61, the arm rest 31, etc. make with respect to the vertical plane. This causes the positions of the coil spring 61, the arm rest 31, etc. to change.

The bolts 58 are tightened when the position and angle of each arm rest 31 relative to the vertical plane are such that the arms AR of a standing polisher W1 can be placed on the arm rest when pressing the workpiece PO held in both hands HA against the polishing surface 15a.

This tightening restricts the vertical movement of the receiving body 55 and the rotation around the bolt 58 to a certain extent. The vertical position of the adjustment tool 73 and the angle it makes with respect to the vertical plane are also adjusted so that the lower end of the clamping portion 73b overlaps with the upper end of the holding plate portion 57. In this state, the bolt 74 is tightened. The holding plate portion 57 is then pressed against the support 51 by the clamping portion 73b. This pressing further restricts the vertical movement of the receiving body 55 and the rotation around the bolt 58. The arm rest 31 is held in the desired position with the angle it makes with respect to the vertical plane set to the desired angle. In this way, both the angle that the receiving surface 56r makes with respect to the vertical plane and the vertical mounting position of the receiving body 55 are adjusted.

When adjusting the attachment position of the cylindrical body 71 relative to the column main body 66 in the cross direction, all the bolts 72 are loosened as shown in FIG. 4. The fastening force of the bolts 72 on the cylindrical body 71 relative to the column main body 66 is weakened. The bolts 72 are moved in the cross direction together with the cylindrical body 71. This movement changes the portion of the outer periphery of the coil spring 61 in the direction along the central axis CL that is surrounded by the cylindrical body 71. When the cylindrical body 71 is moved to the desired position, all the bolts 72 are tightened. The tightening fixes the cylindrical body 71 to the column main body 66. Since the multiple bolts 72 are spaced apart from each other in the cross direction, the cylindrical body 71 is restricted from rotating around both bolts 72.

As described above, when the mounting position of the cylindrical body 71 in the cross direction is adjusted, the amount of radial elastic deformation of the portion of the coil spring 61 between the cylindrical body 71 and the arm rest main body 32 changes. As the distance of the cylindrical body 71 from the receiving main body 56 increases or decreases, the portion of the coil spring 61 that can elastically deform in the radial direction increases or decreases. As the cylindrical body 71 moves away from the receiving main body 56, the portion of the coil spring 61 that can elastically deform in the radial direction decreases, so the movable range of the arm rest 31 becomes narrower. Figure 10 shows the case where the cylindrical body 71 is brought closer to the receiving main body 56. The portion of the coil spring 61 that can elastically deform in the radial direction increases, so the movable range of the arm rest 31 becomes wider.

As shown in Figs. 1 and 3, when adjusting the mounting position of the support 51 relative to the rail 45 in the front-rear direction, all of the bolts 52 inserted through the long holes 48 are loosened. The fastening force of the bolts 52 on the support 51 relative to the rail 45 is weakened. The bolts 52 are moved in the front-rear direction along the long holes 48 together with the support 51. This movement changes the position of the support 51 in the front-rear direction. Accordingly, the position of the member attached to the support 51 in the front-rear direction changes. When the support 51 has been moved to the desired position in the front-rear direction, all of the bolts 52 are tightened. This tightening fixes the support 51 to the rail 45. Since the multiple bolts 52 are spaced apart from each other in the front-rear direction, the rotation of the support 51 around the bolts 52 is restricted.

Furthermore, when adjusting the left-right mounting position of the rail 45 relative to the rail mounting parts 37 and 41, all of the bolts 46 are loosened. This weakens the fastening force of the bolts 46 relative to the rail mounting part 37 of the rail 45. In addition, when the bolt 47 is loosened, the fastening force of the bolt 47 relative to the rail mounting part 41 of the rail 45 is weakened.

All of the bolts 46, 47 are moved left and right along the long holes 38, 39 together with the rail 45. The movement of these bolts 46, 47 changes the left and right position of the rail 45. Accordingly, the left and right positions of the members attached to the rail 45 change. When the rail 45 has been moved to the desired left and right position, all of the bolts 46, 47 are tightened into their corresponding nuts. With these tightenings, the rail 45 is attached to both rail attachment parts 37, 41.

Next, the effects of the first embodiment will be described.
(1-1) As shown in FIG. 9, the arm support device 30 is provided with an arm rest and a support. Therefore, less force is required to be applied to the arm AR, and fatigue of the arm AR can be reduced. In addition to reducing fatigue of the arm AR, fatigue of the lower back, back muscles, neck, and other parts of the body can be reduced. Furthermore, the position of the arm AR can be stabilized. In addition, the polishing worker W1 can be prevented from bending his/her back muscles or neck. In other words, the polishing worker W1 can continue polishing work in a good polishing posture. As a result, fatigue of the body including the arm AR can be further reduced.

(1-2) In particular, when the polisher W1 performs polishing work in a standing position, unlike when the polisher W1 performs polishing work in a sitting position, there is no part that supports the arms AR holding the workpiece PO from below. In this regard, in the first embodiment, the arm rests are located adjacent to the lower side of both arms AR when the polisher W1 performs polishing work in a standing position presses the workpiece PO held by both hands HA against the polishing surface 15a of the belt 15. Therefore, the arm support device 30 is particularly effective in reducing fatigue when the polisher W1 performs polishing work in a standing position.

(1-3) As shown in FIG. 1, the arm rest section has a pair of arm rest bodies 31, and the support section has a pair of support mechanism sections 35. Therefore, the support positions of the arms AR can be made different for the left and right arms AR. This makes it easier for the polishing worker W1 to perform the polishing work.

(1-4) Each support mechanism 35 has a receiving body 55 and a coil spring 61. Therefore, each arm AR is supported from below by the coil spring 61 via the arm rest 31, and the downward movement of each arm AR can be restricted.

(1-5) Furthermore, the configuration of (1-4) above allows the upward and downward movement of the arm AR to be received by elastic deformation of the coil spring 61 in a direction along the central axis CL. As shown in FIG. 9, polishing work can be performed while displacing the arm AR in the upward and downward directions, improving workability.

In addition, by applying force in the front-back or left-right direction to the arm AR placed on the arm rest 31, the coil spring 61 can be elastically deformed in the radial direction. This radial elastic deformation allows the hand HA to be positioned in a position suitable for pressing the surface of the object PO against the polishing surface 15a, regardless of the size of the object PO or the build of the polisher W1.

For example, when the object to be polished PO is large, the arm AR, and in particular the wrist WR, is moved significantly to move it. At that time, the coil spring 61 is elastically deformed in a radial direction, for example, in the front-back or left-right direction, to move the wrist WR and change the contact point of the object to be polished PO with the buff 14.

(1-6) As shown in Figures 5 to 7, each support mechanism 35 includes a support column 51, a receiving surface angle adjustment unit A1, and a receiving body position adjustment unit A2. Therefore, at least one of the angle adjustment of the receiving surface 56r and the vertical position adjustment of the receiving body 55 is performed. This adjustment allows the hand HA holding the object to be polished PO to be positioned in a position suitable for pressing the surface of the object to be polished PO against the polishing surface 15a, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(1-7) As shown in FIG. 4, each support mechanism 35 includes a guide column 65, a cylindrical body 71, and a cylindrical body position adjustment part A3. Therefore, by adjusting the mounting position of the cylindrical body 71 relative to the column main body part 66 in the intersecting direction intersecting with the receiving surface 56r, the portion of the coil spring 61 between the cylindrical body 71 and the arm rest 31 can be increased or decreased. Accordingly, the portion of the coil spring 61 that can elastically deform in the radial direction can be increased or decreased, thereby increasing or decreasing the movable range of the arm rest 31. It becomes easy to position the hand HA holding the object to be polished PO in a position suitable for pressing the surface of the object to be polished PO against the polishing surface 15a, regardless of the size of the object to be polished PO, the physique of the polishing operator W1, etc.

(1-8) As shown in FIG. 3, each support mechanism 35 is equipped with a rail 45 and a support position adjustment unit A4. Therefore, the attachment position of the support 51 relative to the rail 45 can be adjusted in the front-rear direction. This adjustment allows the hand HA holding the object to be polished PO to be positioned in the front-rear direction at a location suitable for pressing the surface of the object to be polished PO against the polishing surface 15a, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(1-9) Each support mechanism 35 is equipped with a rail mounting portion 37, 41 and a rail position adjustment portion A5. Therefore, the mounting position of the rail 45 relative to the rail mounting portions 37, 41 in the left-right direction can be adjusted. This adjustment allows the hand HA holding the object to be polished PO to be positioned in a left-right direction suitable for pressing the surface of the object to be polished PO against the polishing surface 15a, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(1-10) The rail mounting parts 37, 41 are removably attached to the base 21 by bolts 42 or the like. Therefore, when support of the arm AR by the arm support device 30 is not required, the support mechanism part 35 can be removed from the base 21 at the rail mounting parts 37, 41.

Second Embodiment
Next, a second embodiment of the arm support device will be described with reference to FIGS.
As shown in Figure 11, an arm support device 80 of the second embodiment comprises an arm rest portion and a support portion. The arm rest portion comprises a pair of arm rest bodies 81 on which each of the arms AR is placed. The support portion comprises a pair of support mechanisms 82 provided for each arm rest body 81. Each support mechanism 82 is constructed by connecting a number of members. The components of the pair of support mechanisms 82 are arranged so as to be plane-symmetrical with respect to a plane of symmetry 36 set in the center between the arm rest bodies 81 in the left-right direction. In these respects, the second embodiment is common to the above-mentioned first embodiment.

The second embodiment differs from the first embodiment in the shape of the arm rest 81 and the configuration of the support mechanism 82. The second embodiment also differs from the first embodiment in that the tray 16 of the buffing machine 10 is the mounting part to which the arm support device 80 is attached, whereas the first embodiment differs from the first embodiment in that the arm support device 80 is attached to the mounting stand 21, which is the mounting part.

In the second embodiment, each arm rest 81 extends horizontally and has a cylindrical shape with both ends open. Each support mechanism 82 includes a base 83, a vertical shaft 91, a connecting portion 93, and a horizontal shaft 102.

[Base 83]
As shown in FIG. 11 and FIG. 12, the base 83 includes a base body 84 common to the pair of support mechanism parts 82 and a base part 87 provided for each support mechanism part 82. The base body 84 is formed in a shape elongated in the left-right direction by connecting a plurality of members. The base body 84 has a groove part 85 extending in the left-right direction and having an open lower end. The rear wall part 16r of the tray 16 is inserted into the groove part 85 from below. Furthermore, a push screw part 86a formed at the tip part of a T-shaped lever 86 is screwed into the base body 84 from the rear. The push screw part 86a enters the groove part 85 and presses the rear wall part 16r against the part of the base body 84 that is forward of the groove part 85. In this way, the base body 84 is removably attached to the buffing machine 10 as the attachment part.

11, 13 and 14, each base 87 is rectangular and is fastened by a bolt 88 to the end of the base body 84 opposite the buff 14, sandwiching the arm rest 81. A vertical hole 89 extending in the vertical direction penetrates each base 87. Here, in order to identify each part of each support mechanism 82, the side closer to the buff 14 in the left-right direction is referred to as the "inner" or "inner side", and the side farther from the buff 14 is referred to as the "outer" or "outer side", as in the first embodiment. Each base 87 is formed with a vertical slit 90 that extends in the vertical and left-right directions and connects the outer surface 87e of the base 87 to the vertical hole 89 in the left-right direction. Between the vertical hole 89 and the outer surface 87e of each base 87, a pair of elastic pieces 87a, 87b are formed on both the front and rear sides of the vertical slit 90.

[Vertical shaft 91]
The vertical shaft 91 extends in the up-down direction and is inserted into the vertical hole 89 so as to be movable in the up-down direction. A lever 92 is used to fasten the vertical shaft 91 to the base portion 87. The lever 92 has a threaded portion 92a extending in the front-rear direction. The threaded portion 92a is inserted into one elastic piece portion 87a and screwed into the other elastic piece portion 87b. By fastening the threaded portion 92a, both elastic pieces 87a, 87b are elastically deformed so as to approach each other. As a result, the vertical hole 89 is reduced in diameter, and the vertical shaft 91 is fastened to the base portion 87.

[Connecting portion 93]
As shown in Figs. 13 and 14, the connecting part 93 has a rectangular parallelepiped shape and is attached to the upper end of the vertical shaft 91. More specifically, a vertical hole 94 extending in the vertical direction is formed through the connecting part 93. A vertical slit 95 is formed in the connecting part 93, extending in the vertical direction and in the radial direction of the vertical hole 94, and connecting the front surface 93f of the connecting part 93 to the vertical hole 94. A pair of elastic pieces 93a, 93b are formed on both sides of the vertical slit 95 between the vertical hole 94 and the front surface 93f of the connecting part 93. A bolt 97 extending in the horizontal direction is inserted into one elastic piece 93a of the connecting part 93 and screwed into the other elastic piece 93b. By tightening the bolt 97, the elastic pieces 93a, 93b are elastically deformed so as to approach each other. As a result, the vertical hole 94 is reduced in diameter, and the connecting part 93 is fastened to the vertical shaft 91. The elastic pieces 93a, 93b are elastically restored to their original state by loosening the bolt 97. The fastening force of the elastic pieces 93a, 93b to the vertical shaft 91 is weakened, and the connecting portion 93 can be rotated around the vertical shaft 91.

A horizontal hole 98 extends horizontally through the connecting portion 93, at a portion rearward of the vertical hole 94. A horizontal slit 99 is formed in the connecting portion 93, extending horizontally and connecting the rear surface 93r of the connecting portion 93 to the horizontal hole 98. A pair of elastic pieces 93c, 93d are formed on both the upper and lower sides of the horizontal slit 99 between the horizontal hole 98 and the rear surface 93r of the connecting portion 93.

[Horizontal shaft 102]
The horizontal shaft 102 extends horizontally and is inserted into the horizontal hole 98 of the connecting part 93 so as to be movable horizontally. A bolt 103 extending in the vertical direction is inserted into one of the elastic pieces 93c of the connecting part 93 and screwed into the other elastic piece 93d. By tightening the bolt 103, both elastic pieces 93c and 93d are elastically deformed so as to approach each other. As a result, the horizontal hole 98 is reduced in diameter, and the horizontal shaft 102 is fastened to the connecting part 93. In this way, the horizontal shaft 102 is attached to the vertical shaft 91 via the connecting part 93. As shown in FIG. 11, the arm rest body 81 is attached in a covered state to the horizontal shaft 102.

As shown in Figures 13 and 14, the arm support device 80 of the second embodiment further includes various adjustment units, namely, a horizontal shaft position adjustment unit B1, a horizontal shaft angle adjustment unit B2, and a vertical shaft position adjustment unit B3. By adjusting these adjustment units, the position and inclination of the arm rest body 81 can be adjusted.

[Horizontal shaft position adjustment unit B1]
The horizontal shaft position adjustment part B1 is provided between the connecting part 93 and the horizontal shaft 102 in order to adjust the attachment position of the horizontal shaft 102 in the longitudinal direction relative to the connecting part 93. The horizontal shaft position adjustment part B1 is composed of the horizontal hole 98, the horizontal slit 99, the pair of elastic pieces 93c, 93d, and the bolt 103 in the connecting part 93 described above.

[Horizontal shaft angle adjustment part B2]
The horizontal shaft angle adjustment part B2 is provided between the vertical shaft 91 and the connecting part 93 in order to adjust the angle of the horizontal shaft 102 with respect to the left-right direction. The horizontal shaft angle adjustment part B2 is composed of the vertical hole 94, the vertical slit 95, the pair of elastic pieces 93a, 93b, and the bolt 97 in the connecting part 93 described above.

[Vertical shaft position adjustment unit B3]
The vertical shaft position adjustment part B3 is provided between the base part 87 and the vertical shaft 91 in order to adjust the mounting position of the vertical shaft 91 relative to the base part 83. The vertical shaft position adjustment part B3 is composed of the vertical hole 89, the vertical slit 90, and the pair of elastic pieces 87a, 87b in the base part 87 described above, and is also composed of a lever 92 having a screw part 92a.

In the second embodiment, the same elements as those described in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.
Next, the operation of the second embodiment configured as above will be described.

As shown in FIG. 15, when polishing the surface of the workpiece PO, the polisher W1 in a standing position presses the workpiece PO held in both hands HA from behind the buff 14 against the polishing surface 15a of the belt 15 that moves in a circular motion as the buff 14 rotates. At this time, arm rests 81 are positioned below both arms AR of the polisher W1. Both arms AR of the polisher W1 are placed on the corresponding arm rests 81. The weight of each arm AR acts on the arm rests 81. The arm rests 81 are supported by the horizontal shaft 102, the connecting portion 93, and the vertical shaft 91 in the support mechanism 82. The vertical shaft 91 is attached to the tray 16 of the buff polisher 10 via the base 83.

Therefore, as described above, the load of the arm AR acting on each arm rest 81 is transmitted to the buffing machine 10 at the tray 16 via the horizontal shaft 102, the connecting portion 93, the vertical shaft 91, and the base portion 83, and is received. In this case, the arm AR is supported horizontally by the horizontal shaft 102 via the arm rest 81. The downward movement of the arm AR is regulated by the arm rest 81, each portion of the support mechanism 82, and the buffing machine 10.

As a result, the polisher W1 can use less force than before to position both arms AR at a position to press the workpiece PO, which is held in both hands HA, against the polishing surface 15a from behind the buff 14, and can hold it in that position. Because less force is required to be applied to the arms AR, the various parts of the body of the polisher W1, including the arms AR, are less likely to become fatigued.

Furthermore, by adjusting various adjustment parts in the arm support device 30, the position and inclination of the arm rest 81 can be adjusted. For example, by loosening the bolt 103 shown in FIG. 13, the elastic pieces 93c and 93d are elastically restored to their original position away from each other. The fastening force of the elastic pieces 93c and 93d to the horizontal shaft 102 is weakened, allowing the horizontal shaft 102 to slide in the direction along the horizontal hole 98. After the sliding movement, the bolt 103 is tightened, causing the elastic pieces 93c and 93d to elastically deform toward each other. The fastening force of the elastic pieces 93c and 93d to the horizontal shaft 102 is strengthened, restricting the sliding movement of the horizontal shaft 102 in the direction along the horizontal hole 98. In this way, the attachment position of the horizontal shaft 102 in the longitudinal direction relative to the connecting part 93 is adjusted.

The bolt 97 shown in FIG. 14 is loosened. Then, both elastic pieces 93a and 93b are elastically restored to their original position away from each other. The fastening force of both elastic pieces 93a and 93b to the vertical shaft 91 is weakened. Therefore, as shown by the two-dot chain line in FIG. 14, it is possible to rotate the connecting part 93 and the horizontal shaft 102 around the vertical shaft 91. After the rotation, the bolt 97 is tightened, so that both elastic pieces 93a and 93b are elastically deformed to move closer to each other. The fastening force of both elastic pieces 93a and 93b to the vertical shaft 91 is strengthened. Therefore, the rotation of the connecting part 93 and the horizontal shaft 102 around the vertical shaft 91 is restricted. In this way, the angle that the horizontal shaft 102 makes with respect to the left-right direction is adjusted.

Furthermore, the lever 92 shown in FIG. 13 is rotated to loosen the screw portion 92a. Then, the elastic pieces 87a and 87b are elastically restored to their original position away from each other, and the fastening force of the elastic pieces 87a and 87b to the vertical shaft 91 is weakened. Therefore, as shown by the two-dot chain line in FIG. 11, the vertical shaft 91 can slide up and down together with the connecting portion 93, the horizontal shaft 102, and the arm rest 81. After the sliding movement, the lever 92 is rotated to tighten the screw portion 92a, so that the elastic pieces 87a and 87b are elastically deformed to move closer to each other. Since the fastening force of the elastic pieces 87a and 87b to the vertical shaft 91 is strengthened, the vertical sliding movement of the vertical shaft 91 is restricted. In this way, the vertical mounting position of the vertical shaft 91 relative to the base 83 (base portion 87) is adjusted.

Next, the effects of the second embodiment will be described.
(2-1) As shown in Figure 11, an arm support device 80 has an arm rest portion and a support portion. The arm rest portion has a pair of arm rest bodies 81. The support portion has a pair of support mechanism parts 82 that are attached to the buff polishing machine 10 (tray 16). Each support mechanism part 82 has a base part 83, a vertical shaft 91, a connecting part 93, and a horizontal shaft 102. Each arm rest body 81 is attached to the horizontal shaft 102. Each arm rest body 81 is positioned at a location where both arms AR can be placed when a polishing operator W1 performing polishing work in a standing position presses a polished object PO held with both hands HA against the polishing surface 15a.

As a result, it is possible to obtain the same effects as (1-1) to (1-3) in the first embodiment. In addition, as an effect corresponding to (1-4), the downward movement of each arm AR can be restricted by the arm rest body 81, each part of the support mechanism 82, and the buffing machine 10.

(2-2) As shown in Figures 13 and 14, each support mechanism 82 is equipped with a horizontal shaft position adjustment part B1. Therefore, by adjusting the attachment position of the horizontal shaft 102 relative to the connecting part 93 in the longitudinal direction, the position of the arm rest 81 in the same direction can be adjusted. The hand HA holding the object to be polished PO can be positioned in a horizontal position suitable for pressing the surface of the object to be polished PO against the polishing surface 15a from the rear of the buff 14, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(2-3) Each support mechanism 82 is equipped with a horizontal shaft angle adjustment section B2. Therefore, the angle between the horizontal shaft 102 and the arm rest 81 in the left-right direction can be adjusted. The hand HA holding the object to be polished PO can be positioned in a position suitable for pressing the surface of the object to be polished PO against the polishing surface 15a from behind the buff 14, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(2-4) As shown in FIG. 13, each support mechanism 82 is equipped with a vertical shaft position adjustment unit B3. Therefore, by adjusting the vertical attachment position of the vertical shaft 91 relative to the base 83 (base portion 87), the vertical position of the armrest 81 can be adjusted. The hand HA holding the object to be polished PO can be positioned in a vertical position suitable for pressing the surface of the object to be polished PO against the polishing surface 15a from the rear of the buff 14, regardless of the size of the object to be polished PO or the build of the polishing worker W1.

(2-5) Unlike the first embodiment that uses the coil spring 61, the support mechanism 82 does not have components that bend significantly. It is difficult for the polisher W1 to apply force to his or her arm AR during polishing work to change the position of the arm rest 81 in the front-back or left-right direction. For this reason, the arm support device 80 of the second embodiment is more suitable for polishing smaller objects PO than those of the first embodiment.

(2-6) Each support mechanism 82 is removably attached to the tray 16 of the buffing machine 10. Therefore, similar to (1-10) in the first embodiment, when support of the arm AR by the arm support device 80 is not required, both support mechanisms 82 can be removed from the buffing machine 10.

The above embodiment can also be implemented as a modified example with the following changes. The above embodiment and the following modified examples can be implemented in combination with each other to the extent that there is no technical contradiction.

<Common features between the first and second embodiments>
A single arm rest body capable of supporting both arms AR may be used as the arm rest. In this case, the support portion may be constituted by a single support mechanism portion 35, 82.

- If the factory where buffing is performed has multiple buffing machines 10, the arm support devices 30, 80 may be attached to different buffing machines 10. The combination of the buffing machine 10 and the arm support devices 30, 80 used for the polishing work may be switched depending on the size of the object to be polished PO, etc. For example, when polishing a small object to be polished PO, a buffing machine 10 equipped with an arm support device 80 is used. When polishing a large object to be polished PO, a buffing machine 10 equipped with an arm support device 30 may be used.

In contrast, if the factory or the like has only one buffing machine 10, the arm support device 30, 80 may be selectively attached to the buffing machine 10 depending on the size of the workpiece PO, etc.

In addition, even if the factory, etc. has multiple combinations of buffing machines 10 and stands 21 or only one combination, and the arm support devices 30, 80 are attached to the stand 21, the same modifications as those when the arm support devices 30, 80 are attached to the buffing machine 10 can be made. In this case, the only change is that the attachment target of the arm support devices 30, 80 is changed from the buffing machine 10 to the stand 21.

- As described above, the arm support devices 30, 80 have a particularly large effect when used when the polishing worker W1 is performing polishing work in a standing position. However, the arm support devices 30, 80 may also be used when the polishing worker W1 is performing polishing work in a sitting position. Even in this case, the effect of reducing fatigue of the polishing worker W1 can be obtained.

- Buff polishing may be performed by removing the belt 15 from the buff polishing machine 10 and pressing the object to be polished PO against the polishing surface 14a of the buff 14. In this case, the part to which the object to be polished PO is pressed changes from the polishing surface 15a of the belt 15 to the polishing surface 14a of the buff 14, but both arms AR are supported by the arm support devices 30, 80. Therefore, the same effects as those of the first and second embodiments can be obtained.

<Matters Related to the First Embodiment>
Arm support device 30 may be attached to a component different from that in the first embodiment, provided that it is a component of gantry 21.

The arm support device 30 may be attached to equipment surrounding the buffing machine 10, but different from the stand 21. The arm support device 30 may also be attached to the buffing machine 10 and the equipment surrounding the buffing machine 10 (including the stand 21) in a state spanning both. When the arm support device 30 is attached to the buffing machine 10, it may be attached to the tray 16, or it may be attached to a location different from the tray 16.

At least one of the receiving surface angle adjustment unit A1, the receiving body position adjustment unit A2, the cylindrical body position adjustment unit A3, the support position adjustment unit A4, and the rail position adjustment unit A5 may be omitted.
<Matters Concerning the Second Embodiment>
At least the portion of the arm rest 81 on which the arm AR is placed may be made of an elastic material such as rubber or sponge.

The arm rest 81 may be formed in a tubular shape other than a cylinder, or in a shape other than a cylinder. A different shape that is tubular may be a shape in which the surface on which the arm AR is placed is composed of a flat surface, such as a flat plate or a rectangular parallelepiped. In this case, the arm rest 81 may be attached to the horizontal shaft 102 so that it can rotate around the axis of the horizontal shaft 102. This modification has the advantage that the inclination of the arm rest 81 can be changed by the rotation during the polishing operation, which makes it easier to move the polished object PO and change the contact area with the polishing surfaces 14a, 15a.

The vertical shaft 91 may be attached to the base 83 in a state where its movement in the vertical direction is restricted. In this case, the vertical position of the horizontal shaft 102 may be adjusted by sliding the connecting portion 93 in the vertical direction relative to the vertical shaft 91.

The arm support device 80 may be attached to the equipment surrounding the buffing machine 10 (including the stand 21) instead of the buffing machine 10. The arm support device 80 may also be attached to the buffing machine 10 and the equipment surrounding the buffing machine 10 (including the stand 21) in a state spanning both of them.

- At least one of the horizontal shaft position adjustment unit B1, the horizontal shaft angle adjustment unit B2, and the vertical shaft position adjustment unit B3 may be omitted.

10... Buffing machine (mounting part)
14: buff 14a, 15a: polishing surface 15: belt 21: stand (surrounding equipment, mounting part)
30, 80... Arm support device 31, 81... Arm rest body (arm rest portion)
35, 82...Support mechanism part (support part)
55... Receiving body 56r... Receiving surface 61... Coil spring 65... Guide column 66... Column main body 71... Cylindrical body 83... Base 91... Vertical shaft 93... Connection part 102... Horizontal shaft A1... Receiving surface angle adjustment part A3... Cylindrical body position adjustment part AR... Arm B2... Horizontal shaft angle adjustment part B3... Vertical shaft position adjustment part CL... Central axis HA... Hand PO... Polished object W1... Polishing operator

Claims (2)

This device is used when, in polishing the surface of an object to be polished, the object to be polished is pressed against the polishing surface on the outer periphery of a rotating disc-shaped buff in a buff polishing machine, or when the object to be polished is pressed against the polishing surface on the outer periphery of an endless belt that moves in a circular motion as the buff rotates,
an arm rest portion on which a polishing worker in a standing position can rest both arms when pressing the polished object held by both hands against the polishing surface;
a support part that is attached to at least one of the buffing machine and equipment around the buffing machine as a mounting part and supports the armrest part ;
The arm rest portion includes a pair of arm rest bodies on which both arms are respectively placed,
the support section is provided for each of the arm rests, is attached to the attachment section, and includes a pair of support mechanism sections that support each of the arm rests;
Each support mechanism is
A receiving body disposed at a position spaced downward from the armrest body;
a coil spring that is wound helically around a central axis between the arm rest and the receiving body, elastically deforms in response to a load, and is attached to the arm rest at one end and to the receiving body at the other end;
a guide pillar having a pillar body portion extending in a direction intersecting a receiving surface of the receiving body with which the other end of the coil spring contacts, and fixed to the receiving body;
A cylindrical body is disposed around a portion of the coil spring in a direction along the central axis and is attached to the column main body;
An arm support device for a grinding machine comprising: a cylindrical body position adjustment portion that is provided between the guide pillar and the cylindrical body and adjusts the mounting position of the cylindrical body relative to the pillar main body portion in the intersecting direction . 2. The arm support device for a grinding machine as described in claim 1 , wherein each support mechanism further comprises a receiving surface angle adjustment portion provided between the mounting portion and the receiving body and adapted to adjust the angle that the receiving surface makes with respect to a vertical plane.

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