JP6711308B2 - Cushioning member, cover device, machine tool - Google Patents

Description

The present invention relates to a cushioning member, a cover device, and a machine tool.

A machine tool moves a column, a table, or the like by a feed mechanism to process a workpiece. During processing, chips, cutting fluid splashes, etc. are scattered. The machine tool includes a cover device that covers the feed mechanism. The cover device prevents chips, splashes of cutting fluid, and the like from entering the feeding mechanism. The cover device includes a plurality of covers. The plurality of covers are superposed in a nested manner, and the entire cover device is configured to be expandable and contractible.

For example, the cover device described in Patent Document 1 includes an elastic body. The elastic body is made of rubber or the like and fixed to the inner surface of the rear end of the cover. When the cover device extends, the rear end of the front cover and the front end of the rear cover overlap. The elastic body of the front cover collides with a stopper plate provided at the front end of the rear cover. The elastic body absorbs the impact when the front cover and the rear cover collide.

Patent No. 5970977

However, the cover device may generate a slight vibration when the elastic body collides with the stopper plate. The tool of the machine tool may pass near the surface of the work piece when moving relatively between two machining positions on the work piece. At that time, if a slight vibration occurs, the tool may come into contact with the work piece and leave a contact mark on the work piece.

An object of the present invention is to provide a cushioning member, a cover device, and a machine tool that reliably absorb impact.

According to the first aspect of the present invention, when the two movable bodies that are telescopically stacked and telescopically formed are in at least one of a relatively expanded state and a relatively contracted state, A cushioning member that is provided between a moving body and includes a contact member that elastically abuts against the two moving bodies, and that cushions the impact when the two moving bodies collide with the contact member. The cushioning member is made of an elastic body, and is attached to an end of one of the two moving bodies that overlaps with the other moving body, and the two moving bodies. A pair of arms that extend and contract from the attachment portion on one side in the direction of expansion and contraction, and extend toward the respective tip portions while widening the distance between the attachment portion side and the tip portion side. , The length of the two arm portions extending in the expansion and contraction direction from the end of the one moving body on the side overlapping with the other moving body toward the end of the other moving body is A cushioning member is provided which is longer than the length of the contact member in the expansion and contraction direction.

In the first aspect, the abutment member is located between the two moving bodies and absorbs impact when the two moving bodies collide with each other when the two moving bodies relatively expand and contract. The buffer member is provided at the end of one moving body. The two arms of the cushioning member have a length extending in the expansion/contraction direction from the end of one moving body on the side overlapping with the other moving body toward the end of the other moving body. Longer than the length of the contact member. Therefore, in the process of expansion and contraction of the two moving bodies, the tip ends of the two arms contact the other moving body before the contact member abuts on the two moving bodies. The two arms widen the space between the tips and elastically bend, and reduce the speed at which the two moving bodies expand and contract until the two moving bodies collide with the abutting member. Therefore, the cushioning member can reliably absorb the impact when the two moving bodies and the contact member collide.

The two arm portions of the first aspect may extend from the attachment portion at a symmetrical angle in the direction orthogonal to the extending/contracting direction and at the same length. Since the two arms are provided symmetrically, one arm does not hit one side, and the two arms can uniformly apply the pressing force to the other moving body. Therefore, the two moving bodies do not tilt relative to each other in the expansion/contraction direction due to the pressing of the buffer member, and do not rattle during deceleration.

The attachment portion of the first aspect may include a connection portion that extends in a direction orthogonal to the expansion and contraction direction and that connects at both ends to respective base end portions of the two arm portions. The two arm portions are separated from each other at the base end portions by a connecting portion in a direction orthogonal to the extending and contracting direction. That is, the two arm portions abut on the other moving body at positions where the distal end portions are farther from each other than the proximal end portions. Since the two arms evenly apply the pressing force to the other moving body in a wider area, the two moving bodies do not tilt relative to each other in the expansion and contraction direction and do not rattle during deceleration. ..

The connection portion of the first aspect may form a cutout portion between the base end portions of each of the two arm portions, the cutout portion being formed by cutting out an end portion on one side in the expansion/contraction direction toward the other side. .. When the two arms bend, a tensile stress is applied to the connecting portion in a direction orthogonal to the expansion/contraction direction. At this time, the connecting portion can spread in the direction orthogonal to the expansion/contraction direction at the cutout portion, so that the tensile stress can be relieved. Therefore, since the two arms can flex more flexibly, the cushioning member can further reduce the impact when the tip end contacts the other moving body, and the speed at which the two moving bodies expand and contract. Can be surely decelerated. Moreover, since the notch portion relieves the tensile stress applied to the connection portion, it is possible to suppress damage due to repeated stress applied to the connection portion.

The two arms of the first aspect may be chamfered at the tip. When the tip portion comes into contact with the other moving body, the R chamfered portion smoothly slides without being caught on the surface of the other moving body. Therefore, the two arms can be flexed smoothly. Therefore, the cushioning member can further reduce the impact when the tip portion contacts the other moving body, and can surely reduce the speed at which the two moving bodies expand and contract.

There are two sets of the abutting members of the first aspect, and the first set is the end portion of the one moving body on the side overlapping with the other moving body and the movement of the other side on the side overlapping with the one moving body. It is located between the end of the body and elastically abuts the two moving bodies when the two moving bodies are relatively extended, and the second set overlaps with the other moving body. Is located between the end of the one moving body on the side and the end of the other moving body on the side opposite to the side overlapping the one moving body, and the two moving bodies are relatively compressed. In this state, the two arms are elastically abutted, the two arms are two sets, and the first set is the end of the one mover that overlaps with the other mover. A pair of protrusions from the mounting portion toward the end of the other moving body that overlaps the one moving body, and the second set moves the one side that overlaps the other moving body. At the end of the body, a pair may project from the attachment portion toward the end of the other moving body opposite to the side overlapping with the one moving body. The two arms of the first set come into contact with the other moving body in the process in which the two moving bodies relatively extend, and it is possible to mitigate the impact when the two moving bodies collide with the abutting member. The two arms of the second set come into contact with the other moving body in the process of the two moving bodies relatively contracting, and the impact at the time of collision between the two moving bodies and the abutting member can be alleviated. Therefore, the cushioning member can reliably absorb the impact when the two moving bodies collide with the contact member both when the two moving bodies extend and when the two moving bodies contract.

According to the second aspect of the present invention, a plurality of covers are superposed in a nesting manner so that the whole can be expanded and contracted and fixed to a movable body, and at the same time, a machine tool for protecting a feed mechanism for driving the movable body. In the cover device, the plurality of covers includes at least an inner cover and an outer cover that overlaps the outer side of the inner cover, and one end of the inner cover that overlaps the outer cover has an outer surface side of the inner cover. And a first protrusion having a notch-shaped recess for arranging the two arms of the cushioning member according to any one of claims 1 to 6, and protruding to the inner surface side of the inner cover, and A second projecting portion having a mounting portion for removably mounting the mounting portion of the buffer member, and the buffer member in which the mounting portion is mounted on the mounting portion and the two arm portions are arranged in the recess. And a first abutting member provided on the second protruding portion and protruding toward the one end portion side of the outer cover opposite to the side overlapping the inner cover, one end of the outer cover The portion has a third protrusion that protrudes toward the inner surface of the outer cover and contacts the first contact member when the cover device is contracted, and the other end of the outer cover that overlaps the inner cover. The portion has a fourth protrusion that protrudes toward the inner surface of the outer cover, and a second contact member that is provided on the fourth protrusion and that contacts the first protrusion when the cover device is extended. Of the two sets of the two arms, the first pair of the two arms extends toward the fourth protrusion, and when the cover device is extended, the first protrusion is the first arm. Before contacting the second contact member, it contacts the second contact member, the second pair of the two arm portions extends toward the third projecting portion, and when the cover device contracts, A cover device is provided in which one abutting member abuts on the third protrusion before abutting on the third protrusion. Since the cover device according to the second aspect includes the cushioning member according to the first aspect, the same effect as that of the first aspect can be obtained.

According to a third aspect of the present invention, there is provided a machine tool for processing the work material by rotating at least one of the tool and the work material and bringing them into relative contact with each other. It has a movable body which fixes a cutting material, a sending mechanism which drives the movable body, and a cover device according to claim 7 which is fixed to the movable body and protects the feeding mechanism. A machine tool is provided. Since the machine tool according to the third aspect includes the cushioning member according to the first aspect and the cover device according to the second aspect, the same effects as the first aspect and the second aspect can be obtained.

In the present invention, some of the matters specifying the invention of claims 1 to 8 may be arbitrarily combined.

It is a perspective view of the machine tool 1. It is the perspective view which looked at the cover device 12 from the upper right direction. FIG. 6 is a perspective view of the cover device 12 when viewed from the lower left rear. FIG. 4 is a cross-sectional view of the cover device 12 as viewed from the front along the line I-I in FIG. 3. It is the perspective view which expanded the inside of the circle C of FIG. 3 from another direction. FIG. 4 is a perspective view of the cushioning member 100 as viewed from the upper right rear side. FIG. 4 is a plan view of cushioning member 100. FIG. 6 is a plan view of the cushioning member 100 before coming into contact with the wiper 20 when the cover device 12 is extended. 7 is a plan view of the cushioning member 100 when the contact portion 21 of the wiper 20 and the protruding portion 31 of the regulation plate 30 contact each other when the cover device 12 is extended. 6 is a plan view of the cushioning member 100 before contacting the left wall 64 when the cover device 12 contracts. FIG. 6 is a plan view of the cushioning member 100 when the contact member 35 and the left wall 64 contact each other when the cover device 12 contracts. FIG.

A machine tool 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, left and right, front and rear, and up and down indicated by arrows in the drawing will be used. The left-right direction, the front-back direction, and the up-down direction of the machine tool 1 are referred to as the X-axis direction, the Y-axis direction, and the Z-axis direction of the machine tool 1, respectively.

The structure of the machine tool 1 will be described with reference to FIG. The machine tool 1 includes a base 2, a machine body 3, a table 10, a tool changing device 17, and the like. The base 2 is a substantially rectangular parallelepiped iron base. The machine body 3 is provided at the upper rear of the base 2 and cuts a work material (not shown) held on the upper surface of the table 10. The base 2 is provided with a feeding mechanism (not shown) at the center of the upper part. The feed mechanism moves the table 10 in the X-axis direction and the Y-axis direction. The feeding mechanism will be described later. The tool changing device 17 is fixed to a frame 18 provided above the column 5 of the machine body 3. The tool exchanging device 17 exchanges a tool mounted on a main shaft (not shown) of the machine body 3 for another tool.

The machine body 3 includes a column 5, a spindle head 6, a spindle, a control box 19 and the like. The column 5 is an iron columnar member, and is erected on the upper rear portion of the base 2. The spindle head 6 moves up and down along the front surface of the column 5 in the Z-axis direction. The spindle is rotatably supported inside the spindle head 6. A tool is attached to the spindle, and the spindle motor 11 is driven to rotate at high speed. The spindle motor 11 is provided above the spindle head 6. The control box 19 is mounted on the rear side of the column 5. The control box 19 stores various devices inside. The various devices are, for example, an NC control board, a DC switching power supply, a breaker, an inverter for the tool changing device 17, a wiring duct, a servo amplifier, and the like.

The feed mechanism includes a Y-axis feed mechanism 8, a carrier 7, and an X-axis feed mechanism 9. The Y-axis feed mechanism 8 is provided on the upper surface of the base 2. The Y-axis feed mechanism 8 moves the carrier 7 in the Y-axis direction. The Y-axis feed mechanism 8 includes a pair of Y-axis rails (not shown), a Y-axis ball screw (not shown), and a Y-axis motor (not shown), and the Y-axis rail and the Y-axis ball screw extend in the Y-axis direction. The Y-axis ball screw is arranged between the pair of Y-axis rails. The carrier 7 moves along the Y-axis rail. The carrier 7 has a rectangular parallelepiped shape and has a nut (not shown) on the lower surface. The nut is screwed onto the Y-axis ball screw. The Y-axis motor rotates the Y-axis ball screw and moves the carrier 7 together with the nut in the Y-axis direction.

The X-axis feed mechanism 9 is provided on the upper surface of the carrier 7. The X-axis feed mechanism 9 moves the table 10 in the X-axis direction. The X-axis feed mechanism 9 includes a pair of X-axis rails (not shown), an X-axis ball screw (not shown), an X-axis motor (not shown), etc., and the X-axis rail and the X-axis ball screw extend in the X-axis direction. .. The X-axis ball screw is arranged between the pair of X-axis rails. The table 10 moves along the X-axis rail. The table 10 is provided with a nut (not shown) on the lower surface, and the nut is screwed to the X-axis ball screw. The X-axis motor rotates the X-axis ball screw and moves the table 10 in the X-axis direction together with the nut. The table 10 moves in the Y-axis direction via the carrier 7. That is, the table 10 is moved in the X-axis direction and the Y-axis direction by the X-axis feed mechanism 9, the Y-axis feed mechanism 8 and the carrier 7. The machine tool 1 cuts the workpiece by the relative movement of the workpiece and the tool arranged on the table 10.

The table 10 includes a cover device 12 on the right side and a cover device 13 on the left side. Part of the X-axis feed mechanism 9 is exposed to the outside from the right side of the table 10 to the right side. The cover device 12 covers a portion exposed to the outside of the X-axis feed mechanism 9. As shown in FIG. 2, the cover device 12 has a structure in which three covers 41 to 43 having a mountain-shaped cross section are superposed in a nested manner. Each of the covers 41 to 43 has an upper wall, a front wall and a rear wall, and slidably overlaps each other. The cover 41 is the smallest, and the covers 42 and 43 are larger in this order.

The cover 43 is fixed to the right side of the table 10. When the table 10 moves rightward, the covers 42 and 41 are sequentially pushed rightward. As shown by the arrow A, the covers 41 to 43 overlap each other in a nested manner, so that the entire cover device 12 contracts. When the table 10 moves to the left, the covers 42, 41 are pulled out to the outside. As indicated by arrow B, the entire cover device 12 extends. That is, the cover device 12 follows the movement of the table 10 and expands and contracts in the left-right direction (X-axis direction).

As shown in FIG. 1, a part of the X-axis feed mechanism 9 is exposed to the outside from the left side of the table 10 to the left side. The cover device 13 covers the portion exposed to the outside of the X-axis feed mechanism 9. The cover device 13 has the same structure as the cover device 12, and expands and contracts in the left-right direction (X-axis direction) following the movement of the table 10 in the X-axis direction. The carrier 7 includes a cover device 14 on the front side and a Y-axis rear cover (not shown) on the rear side. The cover device 14 follows the movement of the carrier 7 (table 10) in the Y-axis direction and expands and contracts in the front-back direction (Y-axis direction). The Y-axis rear cover is a sheet metal having a mountain-shaped cross section. The Y-axis rear cover moves in the Y-axis direction together with the carrier 7 (table 10). When the carrier 7 moves to the column 5 side, the column 5 stores the Y-axis rear cover inside the lower part.

The structure of the cover device 12 will be specifically described with reference to FIGS. 2 to 4. The cover device 12 expands and contracts in the left-right direction. Therefore, the covers 41 to 43 move in the left-right direction. Since the cover devices 13 and 14 have the same structure as the cover device 12, the description thereof will be omitted.

The cover 41 includes an upper wall 51, a front wall 52, a rear wall 53, a left wall 54, a front lower wall 55, a rear lower wall 56, a right wall 57, and a mounting plate 58. The cross section of the upper wall 51 in a side view has a mountain shape. The front wall 52 extends downward from the front end of the upper wall 51, and has a front lower wall 55 at the lower portion. The front lower wall 55 extends backward from the lower end of the front wall 52 at a substantially right angle. The rear wall 53 extends downward from the rear end of the upper wall 51 and has a rear lower wall 56 at the lower portion. The lower rear wall 56 extends forward from the lower end of the rear wall 53 by folding back at a substantially right angle. The left wall 54 extends downward from the left end of the upper wall 51. The vertical length of the left wall 54 is shorter than the vertical length of the front wall 52. The cross section of the cover 41 as viewed from the side has a substantially inverted U shape.

The right wall 57 is provided at the right end of the cover 41 and covers a part of the opening on the right end side. The mounting plate 58 is fixed to the lower surface of the upper wall 51 and also to the right end of the carrier 7. Therefore, the cover 41 moves left and right relatively to the table 10 that moves left and right on the carrier 7.

The regulation plate 30 is provided on the left surface of the left wall 54 and is fixed to the left wall 54 with a screw. The regulation plate 30 is a metal member that is long in the front-rear direction and has substantially the same shape as the left wall 54. The regulation plate 30 reinforces the left wall 54. The left wall 54 and the regulation plate 30 have a mountain-shaped notch 59 at the center in the front-rear direction at the lower end. The cutout 59 avoids interference with the X-axis feed mechanism 9.

As shown in FIG. 4, the regulation plate 30 includes a protrusion 31 that protrudes above the upper wall 51 of the cover 41. The protruding length of the protruding portion 31 is shorter than the size of the gap between the upper surface of the cover 41 and the lower surface of the cover 42. Therefore, the upper end of the protrusion 31 does not contact the lower surface of the cover 42. When the cover device 12 is extended, the wiper 20 of the cover 42 contacts the right surface of the protrusion 31 and restricts further extension between the covers 41 and 42. The wiper 20 will be described later. The protrusion 31 has recesses 32 that are recessed downward and penetrate right and left at two locations that are substantially symmetrical in the front-rear direction. The regulation plate 30 has a rectangular hole 33 formed below the recess 32 (see FIG. 5). The left wall 54 of the cover 41 has a hole portion having substantially the same shape at a position corresponding to the rectangular hole 33. The cushioning member 100 fixes the mounting portion 140 with the rectangular hole 33, and arranges the two arm portions 110 and 115 in the recess 32. The cushioning member 100 will be described later.

As shown in FIGS. 2 to 4, the contact member 35 is provided at two locations on the left surface of the regulation plate 30 that are substantially symmetrical in the front-rear direction and obliquely below the recess 32. The contact member 35 is a member made of an elastic material such as nitrile rubber having a hardness of 50. When the cover device 12 contracts, the pair of contact members 35 contact the right surface of the left wall 64 of the cover 42 to restrict further contraction between the covers 41 and 42.

The cover 42 is one size larger than the cover 41 and has substantially the same shape as the cover 41. The cover 42 includes an upper wall 61, a front wall 62, a rear wall 63, a left wall 64, a front lower wall 65, and a rear lower wall 66. The cover 42 includes the wiper 20 on the right end portion 67 of the upper wall 61. An edge portion of the right end portion 67 of the upper wall 61 is bent obliquely downward. The wiper 20 has a substantially rectangular shape that is elongated in plan view and extends in the front-rear direction, and is fixed along the lower surface at the right end portion 67 of the upper wall 61. The wiper 20 is a member made of an elastic material such as fluororubber having a hardness of 80.

As shown in FIG. 4, the wiper 20 includes a contact portion 21 and a sliding portion 22. A plurality of contact portions 21 are provided at the left end of the wiper 20 at predetermined intervals and project leftward. The contact portion 21 is formed avoiding the position where the cushioning member 100 is arranged in the front-rear direction (see FIG. 8). The left end of the wiper 20 has an uneven shape in plan view. When the cover device 12 extends, the contact portion 21 contacts the protruding portion 31 of the regulation plate 30 of the cover 41. The sliding portion 22 is provided along the right end portion of the wiper 20, extends obliquely downward to the right, and contacts the upper surface of the upper wall 51 of the cover 41. When the cover device 12 expands and contracts, the right end of the wiper 20 rubs against the upper surface of the upper wall 51 to prevent cutting chips from entering between the covers 41 and 42.

As shown in FIG. 2, the wiper 25 has a substantially rectangular shape that extends in the up-down direction and is elongated in front view, and is fixed along the lower surface at the right end of each of the front wall 62 and the rear wall 63. The wiper 25 is made of an elastic material such as rubber or resin. The wiper 25 has substantially the same configuration as the wiper 20 and has no contact portion and has a sliding portion. The sliding portion of the wiper 25 prevents the cutting debris from entering between the cover 41 and the cover 42 on the front surface side and the rear surface side of the cover device 12.

The regulation plate 30 is also provided on the left surface of the left wall 64, and is fixed to the left wall 64 with a screw. The regulation plate 30 reinforces the left wall 64. The left wall 64 and the regulation plate 30 have a mountain-shaped notch 69 at the center of the lower end in the front-rear direction. The notch 69 avoids interference with the X-axis feed mechanism 9. The regulation plate 30 of the cover 42 is also provided with the above-mentioned pair of abutting members 35 on the left side thereof, and the projecting portion 31 projecting above the upper wall 61. The protrusion 31 of the cover 42 contacts the contact portion 21 of the wiper 20 of the cover 43.

As shown in FIGS. 2 and 3, the cover 43 is one size larger than the cover 42 and has substantially the same shape as the covers 41 and 42. The cover 43 has an upper wall 71, a front wall 72, a rear wall 73, a front lower wall 75, a rear lower wall 76, and a mounting plate 78. An edge portion of the right end portion 77 of the upper wall 71 is bent obliquely downward. Like the cover 42, the wiper 20 is fixed along the lower surface of the right end 77 of the upper wall 71. Similarly, the wiper 25 is also fixed along the lower surface at the right end of each of the front wall 72 and the rear wall 73. The mounting plate 78 is fixed to the upper surface of the upper wall 71 and also to the right side portion of the table 10. Therefore, the cover 43 moves integrally with the table 10.

The reinforcing plate 29 is provided on the left surface of the left wall 74 and is fixed to the left wall 74 with a screw. The reinforcing plate 29 is a metal member that is long in the front-rear direction and has substantially the same shape as the left wall 74. The reinforcing plate 29 reinforces the left wall 74. The left wall 74 and the reinforcing plate 29 have a mountain-shaped notch 79 at the center of the lower end in the front-rear direction. The cutout portion 79 avoids interference with the X-axis feed mechanism 9.

The lower surfaces of the front lower wall 65 and the rear lower wall 66 of the cover 42 slide on the upper surfaces of the front lower wall 75 and the rear lower wall 76 of the cover 43. The lower surfaces of the front lower wall 55 and the rear lower wall 56 of the cover 41 slide on the upper surfaces of the front lower wall 65 and the rear lower wall 66 of the cover 42. Therefore, the cover device 12 expands and contracts on a straight line.

The cushioning member 100 will be described with reference to FIGS. 3 to 7. In the following description, the cushioning member 100 provided on the rear side of the cover 41 will be described as an example. The other cushioning members 100 have the same configuration as the cushioning member 100 exemplified below, and thus the description thereof will be omitted.

The cushioning member 100 has an X shape in a plan view, and is a member made of one component made of an elastic material such as fluororubber having a hardness of 80. The cushioning member 100 includes a mounting portion 140, two sets of connecting portions 130 and 135, and two pairs of arm portions 110, 115, 120 and 125. The attachment portion 140 is a portion for attaching the cushioning member 100 to the regulation plate 30, and has a substantially rectangular parallelepiped shape. The hook portion 150 projects rightward at the bottom of the mounting portion 140. The hook portion 150 has a narrow width portion 151 having a narrow front and rear width at the base portion protruding from the mounting portion 140.

The two sets of connecting portions 130 and 135 each have a substantially rectangular parallelepiped shape extending in the front-rear direction, and are integrally provided in a positional relationship of being arranged side by side. The upper end of the mounting portion 140 is connected to the lower end of the connecting portion 135. The left end of the connecting portion 130 is connected to the right end of the connecting portion 135 and is located above the hooking portion 150.

The pair of arms 110 and 115 have a prismatic shape. A base end portion 112 of the arm portion 110 is connected to a front end portion of the connecting portion 130, and a tip end portion 111 extends obliquely to the front right of the base end portion 112. A base end portion 117 of the arm portion 115 is connected to a rear end portion of the connecting portion 130, and a tip end portion 116 extends obliquely rearward and rearward of the base end portion 117. The arm portions 110 and 115 are chamfered at the upper edge portions. The right corner of each of the tips 111 and 116 is rounded to have a curved shape. The arm part 110 and the arm part 115 extend rightward from the connection part 130 at symmetrical angles in the front-rear direction and at the same length. The length of the arms 110 and 115 in the vertical direction is shorter than the size of the gap between the upper surface of the cover 41 and the lower surface of the cover 42. The arms 110 and 115 are located at substantially the same height as the wiper 20 in the vertical direction.

It is preferable that the distal end portions 111 and 116 are provided so as to be inclined with respect to the proximal end portions 112 and 117 by about 45 degrees with respect to the expansion/contraction direction. The smaller the inclination angle of the distal end portions 111 and 116 with respect to the proximal end portions 112 and 117 is smaller than 45 degrees, the wider the distance between the distal end portions 111 and 116 of the arm portions 110 and 115 becomes, and the more difficult it is to elastically bend. At this time, the shock-absorbing member 100 may have a larger impact at the time of collision with the wiper 20 main body. As the inclination angle of the distal end portions 111, 116 with respect to the proximal end portions 112, 117 becomes larger than 45 degrees, the arm portions 110, 115 widen the space between the distal end portions 111, 116 and are elastically easily bent. At this time, the cushioning member 100 is unlikely to sufficiently reduce the speed at which the covers 41, 42 extend, and the impact at the time of collision between the contact portion 21 and the protrusion 31 may be greater.

As shown in FIG. 8, the length by which the arm portions 110 and 115 extend to the right of the protruding portion 31 of the regulation plate 30 is L1. The length of the contact portion 21 of the wiper 20 protruding leftward from the main body of the wiper 20 is L2. L1 is greater than L2. Therefore, when the cover device 12 is extended, the arm portions 110, 115 move to the left relative to the cushioning member 100 together with the cover 42 before the contact portion 21 of the wiper 20 contacts the right surface of the protrusion 31. Then, the wiper 20 is brought into contact with the main body.

As shown in FIGS. 3 to 7, the right surface of the connecting portion 130 is provided with a cutout portion 131, which is formed by penetrating the connecting portion 130 in the up-down direction and is cut out to the left, at substantially the center in the front-back direction. The connecting portion 130 is deformed such that the cutout portion 131 expands the width in the front-rear direction, so that the right end portion side is extended in the front-rear direction more than the left end portion side. When the arm portions 110 and 115 receive a pressing force toward the left at the tip portions 111 and 116, the tip portions 111 and 116 side bends to the left with respect to the base end portions 112 and 117. When a tensile stress is applied in the front-back direction due to the deformation of the arms 110 and 115, the connecting portion 130 can avoid the concentration of stress between the base end portions 112 and 117 by deforming the notch 131. it can.

The pair of arms 120 and 125 have a prismatic shape. The base end 122 of the arm 120 is connected to the front end of the connecting portion 135, and the tip 121 extends obliquely to the left front of the base 122. A base end portion 127 of the arm portion 125 is connected to a rear end portion of the connecting portion 135, and a tip end portion 126 extends diagonally left rearward of the base end portion 127. The arm portions 120 and 125 are chamfered on the upper surface edge portion. The left corners of the tips 121 and 126 are rounded to have a curved shape. The arm part 120 and the arm part 125 extend leftward from the connection part 135 at symmetrical angles in the front-rear direction and at the same length. The vertical length of the arms 120 and 125 is shorter than the size of the gap between the upper surface of the cover 41 and the lower surface of the cover 42.

It is preferable that the distal end portions 121 and 126 are provided so as to be inclined with respect to the proximal end portions 122 and 127 by about 45 degrees with respect to the expansion/contraction direction. The smaller the inclination angle of the distal end portions 121 and 126 with respect to the proximal end portions 122 and 127 is smaller than 45 degrees, the wider the distance between the distal end portions 121 and 126 of the arm portions 120 and 125 becomes, so that the arm portions 120 and 125 become less elastically flexible. At this time, the shock-absorbing member 100 may have a larger impact when it collides with the right surface of the left wall 64 of the cover 42. As the inclination angle of the distal end portions 121, 126 with respect to the proximal end portions 122, 127 becomes larger than 45 degrees, the arm portions 120, 125 widen the interval between the distal end portions 121, 126 and become elastically flexible. At this time, the cushioning member 100 is less likely to sufficiently reduce the speed at which the covers 41 and 42 extend, and the impact at the time of collision between the contact member 35 and the right surface of the left wall 64 of the cover 42 may be greater. is there.

As shown in FIG. 10, the length by which the arms 120 and 125 extend to the left of the protrusion 31 of the regulation plate 30 is L3. The length of the contact member 35 protruding leftward from the regulation plate 30 is L4. L3 is greater than L4. Therefore, when the cover device 12 contracts, the arm portions 120 and 125 contact the right surface of the left wall 64 of the cover 42 that moves to the right relative to the cushioning member 100 before the contact member 35 contacts. You can touch.

As shown in FIG. 3 to FIG. 7, the left surface of the connecting portion 135 is provided with a notch 136 that penetrates the connecting portion 135 in the up-down direction and is cut out to the right approximately at the center in the front-rear direction. Since the notch 136 is deformed to widen the front and rear widths, the connecting portion 135 is more likely to be deformed so that the left end side is extended frontward and rearward rather than the right end side. When the arms 120 and 125 receive a pressing force toward the right at the distal ends 121 and 126, the distal ends 121 and 126 side bends to the right with respect to the proximal ends 122 and 127. When stress is generated due to the deformation of the arms 120 and 125, the connecting portion 135 can avoid the concentration of stress between the base end portions 122 and 127 due to the deformation of the notch 136.

When fixing the cushioning member 100 to the regulation plate 30, the attachment portion 140 inserts the hook portion 150 into the rectangular hole 33 from the left side of the regulation plate 30. The hook portion 150 is deformed, passes through the rectangular hole 33, is positioned on the right side of the left wall 54, and the narrow portion 151 is arranged in the rectangular hole 33. The mounting portion 140 is fixed to the left surface of the regulation plate 30 by holding the regulation plate 30 and the left wall 54 between the hook portion 150 and the regulation portion 30.

The upper portion of the mounting portion 140 is located at substantially the same height as the upper surface of the upper wall 51. The connecting portion 130 is located in the recess 32, and the pair of arm portions 110 and 115 are arranged on the right side of the projecting portion 31. The pair of arm portions 110 and 115 are arranged such that the respective tip portions 111 and 116 extend obliquely to the front right and obliquely rear to the right. The connecting portion 135 is located on the left side of the protruding portion 31, and the pair of arm portions 120 and 125 are arranged on the left side of the protruding portion 31. The pair of arm portions 120 and 125 are arranged such that the respective tip portions 121 and 126 extend obliquely to the front left and obliquely rear to the left. The pair of arm portions 110, 115, 120, 125 and the connecting portions 130, 135 do not contact the lower surface of the upper wall 61 of the cover 42. Although the pair of arms 110 and 115 are located on the upper surface of the upper wall 51 of the cover 41, they can slide without coming into close contact with the upper surface.

When the cushioning member 100 is detached from the regulation plate 30, the cushioning member 100 is detached by reversing the procedure at the time of attachment by deforming the hook 150 and passing the rectangular hole 33 leftward. When removing the cushioning member 100, the hook portion 150 may be cut from the mounting portion 140 by the narrow width portion 151.

The operation of the cushioning member 100 when the cover device 12 expands and contracts will be described. In the following description, the cushioning member 100 provided on the rear side of the cover 41 described above will be described as an example.

The cover device 12 expands and contracts as the table 10 moves in the X-axis direction. When the table 10 moves to the right, the cover 43 moves to the right along with the table 10. When the left wall 74 of the cover 43 contacts the contact member 35 provided on the regulation plate 30 of the cover 42, the cover 42 moves the cover 42 to the right relatively. When the left wall 64 of the cover 42 contacts the contact member 35 provided on the regulation plate 30 of the cover 41, the relative movement of the cover 42 is stopped. Since the covers 41 to 43 overlap each other in a nested manner, the entire cover device 12 contracts.

When the table 10 moves leftward, the cover 43 moves leftward together with the table 10. When the wiper 20 provided on the right end 77 of the cover 43 comes into contact with the protrusion 31 of the regulation plate 30 of the cover 42, the wiper 20 relatively moves the cover 42 to the left. When the wiper 20 provided on the right end portion 67 of the cover 42 comes into contact with the protruding portion 31 of the regulation plate 30 of the cover 41, the relative movement of the cover 42 is stopped. Since the covers 41 and 42 are relatively pulled out from the cover 43, the entire cover device 12 extends.

As shown in FIG. 8, the cushioning member 100 of the cover 41 extends the arms 110 and 115 diagonally forward right and diagonally rearward, respectively, and places the tips 111 and 116 at the position L1 away from the protrusion 31 to the right. Deploy. When the cover device 12 is extended, the wiper 20 of the cover 42 moves to the left relative to the cushioning member 100 of the cover 41. The contact portion 21 projects leftward from the wiper 20 main body portion by L2. L2 is smaller than L1. Therefore, the tip portions 111 and 116 of the arm portions 110 and 115 come into contact with the wiper 20 main body portion before the contact portion 21 comes into contact with the protrusion portion 31. R chamfering is applied to the right corners of the tip portions 111 and 116. Therefore, when the wiper 20 relatively presses the arm portions 110 and 115 to the left, the tip portions 111 and 116 slide forward and backward while contacting the wiper 20 main body portion, respectively, to smoothly widen the distance in the front-rear direction. You can

As shown in FIG. 9, the arms 110 and 115 elastically bend by widening the gap between the tip portions 111 and 116. Therefore, the speed at which the cover 41 relatively moves to the left is decelerated between the time when the arm portions 110 and 115 contact the wiper 20 main body portion and the time when the contact portion 21 contacts the protrusion 31. Since the arm portions 110 and 115 are provided symmetrically, one of the arm portions abuts the wiper 20 main body portion substantially at the same time without hitting the wiper 20 main body portion at one time, and applies a substantially uniform pressing force. Further, the arm portion 110 and the arm portion 115 are located apart from each other in the front-rear direction by the connecting portion 130. The arms 110 and 115 can evenly apply a pressing force to the main body of the wiper 20 over a wider range than when the connecting portion 130 is not provided.

When the distance between the distal end portions 111 and 116 of the arm portions 110 and 115 further expands, the connecting portion 130 receives tensile stress in the front-rear direction at the portions connected to the proximal end portions 112 and 117. The notch 131 relaxes the tensile stress applied to the connecting portion 130 by deforming to widen the front and rear widths. Therefore, the arm portions 110 and 115 can be flexed flexibly to further widen the space between the tip portions 111 and 116.

The cushioning member 100 reduces the speed at which the cover 41 relatively moves to the left when the cover device 12 is extended due to the elastic deformation of the arms 110 and 115 and the connecting portion 130. The impact when the contact portion 21 and the protruding portion 31 collide with each other is less than that when the cushioning member 100 is not provided. Therefore, the machine tool 1 can prevent the tool and the work material from coming into contact with each other due to the vibration associated with the impact.

As shown in FIG. 10, the cushioning member 100 of the cover 41 extends the arms 120 and 125 diagonally to the left front and diagonally rearward, respectively, and places the tips 121 and 126 at the position L3 away from the protrusion 31 to the left. Deploy. When the cover device 12 contracts, the left wall 64 of the cover 42 moves to the right relative to the cushioning member 100 of the cover 41. The contact member 35 of the cover 41 projects leftward from the regulation plate 30 by L4. L4 is smaller than L3. Therefore, the tip portions 121 and 126 of the arm portions 120 and 125 contact the left wall 64 before the contact member 35 contacts the left wall 64. R chamfering is applied to the left corners of the tip portions 121 and 126. Therefore, when the left wall 64 relatively presses the arms 120 and 125 to the right, the tip ends 121 and 126 slide forward and backward while contacting the left wall 64, respectively, to smoothly widen the front-rear spacing. You can

As shown in FIG. 11, the arm portions 120 and 125 are elastically bent by widening the distance between the tip portions 121 and 126. Therefore, the speed at which the cover 42 relatively moves to the right is decelerated between the time when the arms 120 and 125 contact the left wall 64 and the time when the contact member 35 contacts the left wall 64. Since the arm portions 120 and 125 are provided symmetrically, one arm portion does not hit the left wall 64 but contacts the left wall 64 substantially at the same time and applies a pressing force substantially evenly. Further, the arm portion 120 and the arm portion 125 are located apart from each other in the front-rear direction by the connecting portion 135. The arms 120 and 125 can evenly apply a pressing force to the left wall 64 over a wider area than when the connecting portion 135 is not provided.

When the distance between the front end portions 121 and 126 of the arm portions 120 and 125 further expands, the connecting portion 135 receives tensile stress in the front-rear direction at the portion connected to the base end portions 122 and 127. The notch 136 relaxes the tensile stress applied to the connecting portion 135 by deforming to widen the front and rear width. Therefore, the arm portions 120 and 125 can be flexed flexibly to further widen the space between the tip portions 121 and 126.

The cushioning member 100 reduces the speed at which the cover 42 relatively moves to the right when the cover device 12 contracts due to the elastic deformation of the arms 120 and 125 and the connecting portion 135. The impact when the abutting member 35 and the left wall 64 collide is lessened than when the cushioning member 100 is not provided. Therefore, the machine tool 1 can prevent the tool and the work material from coming into contact with each other due to the vibration associated with the impact.

In the above embodiment, the operation of the cushioning member 100 provided on the rear side of the cover 41 in the expansion and contraction operation of the cover device 12 has been described. The action of the other cushioning members 100 in the expansion and contraction operation of the cover devices 12 to 14 is the same.

As described above, the contact portion 21 is located between the covers 41 and 42, and absorbs the impact when they collide with each other when the covers 41 and 42 relatively extend. The abutment member 35 is located between the covers 41 and 42, and absorbs the impact when the covers 41 and 42 collide with each other when the covers 41 and 42 relatively contract. The cushioning member 100 is provided at the left end of the cover 41. The lengths of the arm portions 110 and 115 of the cushioning member 100 that extend in the expansion and contraction direction from the left end portion of the cover 41 on the side overlapping the cover 42 toward the right end portion of the cover 42 are greater than the length of the contact portion 21 in the expansion and contraction direction. Is also long. The arm portions 120 and 125 of the cushioning member 100 have a length extending from the left end portion of the cover 41 toward the left end portion of the cover 42 in the extension/contraction direction longer than the length of the contact member 35 in the extension/contraction direction. Therefore, in the process of expansion and contraction of the covers 41 and 42, the tip portions 111 and 116 of the arm portions 110 and 115 come into contact with the cover 42 before the abutment portion 21 comes into contact with the cover 41. The tip ends 121 and 126 of the arms 120 and 125 contact the cover 42 before the contact member 35 contacts the cover 42. The arm portions 110 and 115 widen the gap between the tip portions 111 and 116 and elastically bend, reducing the speed at which the covers 41 and 42 relatively extend until the cover 41 collides with the contact portion 21. To do. The arm portions 120 and 125 widen the distance between the tip portions 121 and 126 and elastically bend, reducing the speed at which the covers 41 and 42 relatively contract until the cover 42 collides with the abutting member 35. To do. Therefore, the cushioning member 100 can surely reduce the impact when the covers 41 and 42 collide with the contact portion 21 and the contact member 35.

Since the arm portion 110 and the arm portion 115 are provided symmetrically, one arm portion 110 or 115 does not hit one side when the cover device 12 is extended, and the two arm portions 110 and 115 uniformly press the cover 42. Can be given. Since the arm portion 120 and the arm portion 125 are provided symmetrically, when the cover device 12 contracts, one arm portion 120 or 125 does not hit one side, and the two arm portions 120 and 125 uniformly press the cover 42. Can be given. Therefore, the expansion and contraction directions of the covers 41 and 42 are not relatively inclined by the pressing of the cushioning member 100, and the covers 41 and 42 do not rattle during deceleration.

The arm portions 110 and 115 are separated from each other by the connecting portion 130 between the base end portions 112 and 117 in a direction orthogonal to the expansion/contraction direction. That is, the two arm portions 110 and 115 abut on the cover 42 at positions where the tip portions 111 and 116 are farther from each other than the base portions 112 and 117. The arm portions 120 and 125 are separated from each other by the connecting portion 135 between the base end portions 122 and 127 in a direction orthogonal to the expansion/contraction direction. That is, the two arm portions 120 and 125 are in contact with the cover 42 at positions where the tip portions 121 and 126 are farther from each other than the base portions 122 and 127. Since the two arm portions 110, 115 and 120, 125 uniformly apply the pressing force to the other moving body in a wider range, the relative movement of the covers 41, 42 in the expansion/contraction direction does not relatively tilt. , No rattling when decelerating.

When the two arm portions 110, 115 or 120, 125 bend, a tensile stress is applied to the connection portion 130 or 135 in a direction orthogonal to the expansion/contraction direction. At this time, the connecting portion 130 or 135 can spread in the direction orthogonal to the expansion/contraction direction at the notch 131 or 136, so that the tensile stress can be relaxed. Therefore, since the two arm portions 110, 115 or 120, 125 can flex more flexibly, the cushioning member 100 is more resistant to shock when the tip portions 111, 116 or 121, 126 come into contact with the cover 42. The speed at which the covers 41 and 42 expand and contract can be reliably reduced. Moreover, since the notches 131 and 136 relieve the tensile stress applied to the connecting portions 130 and 135, it is possible to suppress damage due to repeated stress applied to the connecting portions 130 and 135.

The tip portions 111, 116, 121, 126 are R-chamfered on the surfaces that come into contact with the cover 42. When the tip portions 111 and 116 contact the cover 42, the R chamfered portion smoothly slides without being caught on the surface of the wiper 20 main body portion. When the tip portions 121 and 126 contact the cover 42, the R chamfered portion smoothly slides without being caught on the surface of the left wall 64. Therefore, the arm portions 110, 115, 120, 125 can be flexed smoothly. Therefore, the cushioning member 100 can further reduce the impact when the tip portions 111, 116, 121, 126 come into contact with the cover 42, and can reliably reduce the speed at which the covers 41, 42 expand and contract.

The arms 110 and 115 come into contact with the cover 42 while the covers 41 and 42 are relatively extended, so that the impact at the time of collision between the covers 41 and 42 and the contact portion 21 can be mitigated. The arms 120 and 125 come into contact with the cover 42 while the covers 41 and 42 are relatively contracted, and the impact at the time of collision between the covers 41 and 42 and the abutment member 35 can be alleviated. Therefore, the cushioning member 100 can reliably absorb the impact when the covers 41 and 42 collide with the contact portion 21 and the contact member 35 both when the covers 41 and 42 extend and when the covers 41 contract.

The present invention is not limited to the above embodiment, and various modifications can be added. The cutouts 131 and 136 of the cushioning member 100 may be omitted. The connecting portions 130 and 135 of the cushioning member 100 may be omitted. At this time, the base end portions 112, 117, 122, 127 of the arm portions 110, 115, 120, 125 may be connected to the upper portion of the mounting portion 140, respectively. R chamfers may not be applied to the tip portions 111, 116, 121, 126 of the arm portions 110, 115, 120, 125.

The cushioning member 100 has the arm portions 110 and 115 and the arm portions 120 and 125, but may have a configuration having either one of the arm portions 110 and 115 or the arm portions 120 and 125. At this time, the cushioning member having the arm portions 110 and 115 and the cushioning member having the arm portions 120 and 125 may be independently provided at the right end portion of the cover 41.

One cushion member 100 is provided on each of the front portion and the rear portion of the cover 41, but two cushion members 100 may be provided, or more cushion members may be provided. When the cover device 12 is extended, the cushioning member 100 is in contact with the main body of the wiper 20, but may be in contact with the right end portions 67, 77 of the covers 41, 42. Although the abutting member 35 is provided on the left surface of the regulation plate 30 of the cover 41, it may be provided on the right surface of the left wall 64 of the cover 42, or may be provided on the left surface of the regulation plate 30 and the right surface of the left wall 64 facing each other. Good.

The cover device 12 includes three covers 41 to 43, but may include at least two covers. Although the cross sections of the covers 41 to 43 are mountain-shaped, they may be in other shapes. The cross sections of the covers 41 to 43 may be, for example, a substantially inverted U-shape with a flat upper wall, or a shape in which the upper wall is curved in an arc shape. The machine tool 1 rotates the tool and contacts the workpiece on the table 10 to cut the workpiece. For example, the workpiece rotates on the table 10 to contact the workpiece to cut the workpiece. Good.

In the above embodiment, the cover 41 and the cover 42 or the cover 42 and the cover 43 correspond to the “two moving bodies” of the present invention. In the relationship between the cover 41 and the cover 42, the cover 41 corresponds to the “inner cover” of the present invention, and the cover 42 corresponds to the “outer cover” of the present invention. In the relationship between the cover 42 and the cover 43, the cover 42 corresponds to the “inner cover” of the present invention, and the cover 43 corresponds to the “outer cover” of the present invention. The contact portion 21 and the contact member 35 are features that correspond to the "contact member" according to this invention. The contact member 35 among them corresponds to the “first contact member” of the present invention, and the contact portion 21 corresponds to the “second contact member” of the present invention. The table 10 corresponds to the “movable body” of the present invention. The X-axis feed mechanism 9 and the Y-axis feed mechanism 8 correspond to the "feed mechanism" of the present invention. The protrusion 31 corresponds to the “first protrusion” of the present invention. The regulation plate 30 corresponds to the "second protrusion" of the present invention. The left wall 64 of the cover 42 and the left wall 74 of the cover 43 are features that correspond to the "third protrusion" according to the invention. The right end 67 of the cover 42 and the right end 77 of the cover 43 are features that correspond to the “fourth protrusion” according to the invention.

1 machine tool 8 Y-axis feed mechanism 9 X-axis feed mechanism 10 table 12-14 cover device 21 contact part 30 regulation plate 31 projecting part 32 recess 33 rectangular hole 35 contact member 41-43 covers 64, 74 left wall 67, 77 right end 100 cushioning member 110, 115, 120, 125 arm 111, 116, 121, 126 tip 112, 117, 122, 127 base 130, 135 connection 131, 136 notch 140 mounting

Claims (8)

When the two movable bodies that are telescopically stacked and formed in a telescopic manner are in at least one of a relatively expanded state and a relatively contracted state, the two movable bodies are located between the two movable bodies and A cushioning member that is provided in a cover device including a contact member that elastically abuts one moving body, and cushions the impact at the time of collision between the two moving bodies and the contact member,
The cushioning member is made of an elastic body,
Of the end portions of one of the two moving bodies, a mounting portion that is attached to the end portion on the side that overlaps with the other moving body,
The two moving bodies extend and contract in a pair from the mounting portion on one side in the direction of expansion and contraction, and extend toward the respective distal end portions while widening the distance on the distal end portion side from the mounting portion side. The arm of the book,
Equipped with
From the end of the one moving body on the side overlapping with the other moving body toward the end of the other moving body, the length in which the two arm portions extend in the extending/contracting direction is the extending/contracting direction. The cushioning member is longer than the length of the abutting member in. The cushioning member according to claim 1, wherein the two arm portions extend from the mounting portion at a symmetrical angle in the direction orthogonal to the expansion/contraction direction and at the same length. The said attachment part was equipped with the connection part extended in the direction orthogonal to the said expansion-contraction direction, and connecting to the base end part of each of these two arm parts in both ends. Buffer member. The connecting portion has a notch formed between the base end portions of the two arm portions so as to cut the end portion on one side in the expansion and contraction direction toward the other side. The cushioning member according to item 3. The cushioning member according to any one of claims 1 to 4, wherein the two arms have a chamfered front end. There are two sets of the contact members,
The first set is located between an end of the one moving body on the side overlapping with the other moving body and an end of the other moving body on the side overlapping with the one moving body. When the two moving bodies are relatively extended, the two moving bodies elastically contact the two moving bodies,
The second set is located between the end of the one moving body on the side overlapping with the other moving body and the end of the other moving body on the side opposite to the side overlapping with the one moving body. However, when the two moving bodies are relatively contracted, the two moving bodies elastically contact the two moving bodies,
There are two sets of the two arms,
The first set is at the end of the one moving body on the side overlapping with the other moving body, from the mounting portion toward the end of the other moving body on the side overlapping with the one moving body. Protruding in pairs,
The second set, at the end of the one moving body on the side overlapping with the other moving body, toward the end of the other moving body on the side opposite to the side overlapping with the one moving body, The cushioning member according to claim 1, wherein the cushioning member projects in a pair from the mounting portion. A cover device for a machine tool, wherein a plurality of covers are superposed in a nesting manner to form a whole so as to be expandable and contractible, and fixed to a movable body, and protecting a feed mechanism for driving the movable body,
The plurality of covers are
An inner cover,
An outer cover that overlaps the outer side of the inner cover,
At least
One end of the inner cover, which overlaps the outer cover,
A first protrusion having a notch-shaped recess for protruding to the outer surface side of the inner cover and for arranging the two arms of the cushioning member according to claim 1.
A second projecting portion that projects toward the inner surface of the inner cover and that has a mounting portion that detachably mounts the mounting portion of the cushioning member;
The cushioning member in which the mounting portion is mounted on the mounting portion, and the two arm portions are arranged in the recess.
A first contact member that is provided on the second protrusion and that protrudes toward one end side of the outer cover opposite to the side overlapping the inner cover;
Have
One end of the outer cover is
A third protrusion that protrudes toward the inner surface of the outer cover and contacts the first contact member when the cover device is contracted;
The other end of the outer cover on the side overlapping with the inner cover is
A fourth protrusion protruding toward the inner surface of the outer cover,
The second protrusion is provided on the fourth protrusion, and has a second contact member that contacts the first protrusion when the cover device is extended,
Of the two arms of the two sets,
The two arms of the first set extend toward the fourth protrusion, and when the cover device extends, the second protrusion is contacted with the first protrusion before contacting the second contact member. Abut the contact member,
The two arms of the second set extend toward the third protruding portion, and when the cover device is contracted, the third protruding portion is provided before the first contact member abuts against the third protruding portion. A cover device that is in contact with a portion. A machine tool for processing the work material by rotating at least one of a tool and the work material to bring them into relative contact with each other,
A movable body for fixing the tool or the work material,
A feed mechanism that drives the movable body,
The cover device according to claim 7, which is fixed to the movable body to protect the feed mechanism,
A machine tool characterized by having.

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