Wipers for machine tools

Abstract

The present invention provides a machine tool wiper that can reduce the stress acting on the region where the first lip portion and the second lip portion are joined compared to conventional wipers. [Solution] The machine tool wiper 10 has recessed tip portions 36 on both sides of the tip joint point S where the tip corners 33a of the first lip portion 31 and the second lip portion 51 are joined. The recessed tip portions 36 are recessed compared to the straight tip portions 34 that run along imaginary lines extending in the longitudinal direction of the first wiper portion 11 and the second wiper portion 12 from the respective tip corners of the other ends 31b, 51b of the first lip portion 31 and the second lip portion 51, respectively.

Description

Technical Field

[0001] The present invention relates to a wiper for a machine tool.

Background Art

[0002] In a machine tool, a wiper for a machine tool or the like is attached to prevent chips (hereinafter referred to as swarf) generated during machining from entering the inside of the machine through gaps. The wiper for a machine tool may be used not only on a flat surface but also at a corner portion.

[0003] As a wiper for a machine tool that scrapes swarf at a corner portion, for example, a wiper for a machine tool as shown in Patent Document 1 is known. The wiper for a machine tool disclosed in Patent Document 1 has a first wiper portion and a second wiper portion joined and integrated at a right angle. The wiper for a machine tool presses the first lip portion of the first wiper portion and the second lip portion of the second wiper portion against a right-angled corner portion, respectively, elastically deforms these first lip portion and second lip portion, and slides the first lip portion and the second lip portion along the ridge line of the corner portion. Thereby, the wiper for a machine tool can follow the first lip portion and the second lip portion along the ridge line of the corner portion, and scrape off swarf or the like attached to the corner portion with the first lip portion and the second lip portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional machine tool wiper shown in Patent Document 1, when the first lip portion and the second lip portion are slid against a corner portion, if a gap is created between the corner portion and the lip tip of the first lip portion and the lip tip of the second lip portion in the region where the lip tips meet, the scraping performance decreases. In the conventional machine tool wiper, if the first lip portion and the second lip portion are pressed strongly against the corner portion to prevent a decrease in scraping performance, there is a problem that the stress acting on the region where the first lip portion and the second lip portion meet increases.

[0006] The present invention has been made in view of the above problems, and aims to provide a machine tool wiper that can reduce the stress acting on the region where the first lip portion and the second lip portion are joined compared to conventional wipers. [Means for solving the problem]

[0007] The machine tool wiper according to the present invention comprises a first wiper portion having a first lip portion and a second wiper portion having a second lip portion, wherein one end of the first lip portion and one end of the second lip portion are joined, and the first wiper portion and the second wiper portion are arranged at a predetermined angle, and on both sides of the tip joint point where the tip corners of the first lip portion and the second lip portion are joined, in a front view, there are recessed tip portions that are recessed from each end tip corner at the other end of the first lip portion and the second lip portion, respectively, along the longitudinal direction of the first wiper portion and the second wiper portion. [Effects of the Invention]

[0008] According to the present invention, by providing concave tip portions on both sides of the tip joint point where the tip corners of the first lip portion and the second lip portion are joined, the stress acting on the region where the first lip portion and the second lip portion are joined can be reduced compared to the conventional method by the concave tip portions. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing the configuration of a wiper for a machine tool according to this embodiment. [Figure 2] Figure 1 is a front view showing the front configuration of a machine tool wiper as seen from direction F. [Figure 3] This is a cross-sectional view showing the cross-sectional configuration of the first mounting portion along line AA in Figure 2. [Figure 4A] This is a cross-sectional view showing the cross-sectional configuration of the first wiper section along line BB in Figure 2. [Figure 4B] Figure 2 is a cross-sectional view showing the cross-sectional configuration of the first wiper portion at the EE line where the concave tip portion is formed. [Figure 5A] Figure 2 is a magnified detail view of the machine tool wiper shown, focusing on the tip joint point. [Figure 5B] This is a schematic diagram illustrating the structure of the tip corner of the concave tip. [Figure 6A] This is a rear view showing the rear configuration of the machine tool wiper as seen from direction B in Figure 1. [Figure 6B] Figure 6A is a magnified detail view of the machine tool wiper, focusing on the tip joint point. [Figure 7] This is a front view showing the state when the machine tool wiper according to this embodiment is pressed against a corner. [Figure 8A] This is a schematic diagram illustrating the position of the tip joint according to another embodiment. [Figure 8B] This is an enlarged detail view showing the configuration of a machine tool wiper according to another embodiment. [Figure 9] 9A is a front view showing the front configuration of a machine tool wiper with a V-shaped recess at the tip joint, 9B is a front view showing the front configuration of a machine tool wiper with a U-shaped recess at the tip joint, and 9C is a front view showing the front configuration of a machine tool wiper with a semicircular recess at the tip joint. [Figure 10A] This is a cross-sectional view showing the cross-sectional configuration of the first wiper portion according to another embodiment having a reinforcing portion. [Figure 10B]It is a cross-sectional view showing the cross-sectional configuration of the first wiper part according to another embodiment. [Figure 11A] It is a schematic diagram showing the configuration of a wiper for a machine tool according to another embodiment that does not have a straight tip. [Figure 11B] It is a schematic diagram showing the configuration of a wiper for a machine tool that has a concave tip only from an inclined tip.

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described. In the following description, the same components as those already described will be denoted by the same reference numerals and the description thereof will be omitted.

[0011] (1) Configuration of Wiper for Machine Tool FIG. 1 is a perspective view showing the configuration of a wiper 10 for a machine tool according to the present embodiment, and FIG. 2 is a front view showing the configuration of the wiper 10 for a machine tool as viewed from the F direction in FIG. 1. The wiper 10 for a machine tool according to the present embodiment is attached to a machine tool. The wiper 10 for a machine tool is pressed against two adjacent adjacent surfaces that constitute a corner portion (not shown), and scrapes off foreign substances such as chips and cutting fluid adhering to the adjacent surfaces. As shown in FIG. 1, the wiper 10 for a machine tool includes a first wiper part 11 that slides along one adjacent surface adjacent to each other in the corner portion, a second wiper part 12 that slides along the other adjacent surface, and a connecting part 61 that connects one end portions of the first wiper part 11 and the second wiper part 12. In the wiper 10 for a machine tool, the end portions of the first wiper part 11 and the second wiper part 12 are connected by the connecting part 61 at an angle α [°] corresponding to the corner portion that presses the first wiper part 11 and the second wiper part 12.

[0012] The wiper 10 for a machine tool attached to the machine tool moves relative to a corner portion (not shown), so that the first wiper portion 11 slides on one adjacent surface of the corner portion, and the second wiper portion 12 slides on the other adjacent surface, scraping off foreign matter adhering to each adjacent surface. The first wiper portion 11 includes a first attachment portion 21 and a first lip portion 31 provided on one side 25 extending in the longitudinal direction of the first attachment portion 21. The second wiper portion 12 includes a second attachment portion 41 and a second lip portion 51 provided on one side 25 extending in the longitudinal direction of the second attachment portion 41.

[0013] The first attachment portion 21 and the second attachment portion 41 have the same configuration and are respectively attached to the machine tool. The first attachment portion 21 and the second attachment portion 41 include a lip continuous portion 22 and an attachment portion substrate 23 laminated on one surface of the lip continuous portion 22. The lip continuous portion 22 is made of an elastic member and is formed in a rectangular plate shape. Specifically, examples of the elastic member include nitrile rubber (NBR), urethane rubber, fluororubber, hydrogenated nitrile rubber (H-NBR), carboxylated nitrile rubber (X-NBR), natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber, butyl rubber, chloroprene rubber, acrylic rubber, epichlorohydrin rubber, chlorinated polyethylene rubber, silicone rubber, chlorosulfonated polyethylene rubber, polybutadiene rubber, polysulfide rubber, resin, thermoplastic elastomer, and the like. Examples of the thermoplastic elastomer include polyester-based elastomer, polyamide-based elastomer, polyolefin-based elastomer, thermoplastic polyurethane elastomer, and the like.

[0014] The lip continuous portion 22 has a plurality (for example, two) of through holes 24 penetrating the thickness formed side by side along the longitudinal direction. On one side 25 extending in the longitudinal direction of the lip continuous portion 22 of the first attachment portion 21, a first lip portion 31 made of an elastic member is integrally formed so as to bend with respect to the lip continuous portion 22. On one side 25 extending in the longitudinal direction of the lip continuous portion 22 of the second attachment portion 41, a second lip portion 51 made of an elastic member is integrally formed so as to bend with respect to the lip continuous portion 22.

[0015] Figure 3 is a cross-sectional view showing the cross-sectional configuration of the first mounting portion 21 along line AA in Figure 2. Since the cross-sectional configuration of the second mounting portion 41 is the same as that of the first mounting portion 21, the following explanation will focus on the first mounting portion 21. As shown in Figures 1 and 3, the lip connecting portion 22 has a rectangular recessed substrate mounting portion 22a formed on one of its front surfaces, and the mounting portion substrate 23 is positioned within the area of ​​the substrate mounting portion 22a. The mounting portion substrate 23 is made of, for example, a metal material and is formed in the shape of a rectangular plate. In addition, the mounting portion substrate 23 also has a plurality of through holes 24 that penetrate through its thickness, arranged along its longitudinal direction. The mounting portion substrate 23 is positioned within the substrate mounting portion 22a such that the through holes 24 communicate with the through holes 24 of the lip connecting portion 22. The first mounting portion 21 and the second mounting portion 41 are fixed to the machine tool by bolts (not shown) inserted through the through holes 24.

[0016] The connecting portion 61, which connects one end of the first mounting portion 21 in the longitudinal direction and one end of the second mounting portion 41 in the longitudinal direction, is made of the same elastic material as the lip connecting portion 22 of the first mounting portion 21 and the second mounting portion 41, and is formed in the shape of a thin plate (for example, a thin, quadrilateral shape). The end of the lip connecting portion 22 of the first mounting portion 21 is joined to one side of the connecting portion 61. The other side of the connecting portion 61 is adjacent at a predetermined angle to the one side of the connecting portion 61 to which the end of the lip connecting portion 22 of the first mounting portion 21 is joined. The end of the lip connecting portion 22 of the second mounting portion 41 is joined to the other side of the connecting portion 61.

[0017] The thickness of the connecting portion 61 is less than or equal to the thickness of the first mounting portion 21 and the second mounting portion 41 on the lip connecting portion 22, where the mounting portion base plate 23 is provided, and preferably it is selected to be smaller than the thickness of the first mounting portion 21 and the second mounting portion 41. In this embodiment, the thickness of the connecting portion 61 is selected to be less than or equal to the thickness of the thin base plate mounting portion 22a in the lip connecting portion 22. Since the connecting portion 61 is formed from an elastic member with a small thickness, when the first wiper portion 11 and the second wiper portion 12 are pressed against the corner portion that scrapes off foreign matter, and an external force is applied to the first wiper portion 11 and the second wiper portion 12, the connecting portion 61 expands and contracts due to its elasticity. As a result, the connecting portion 61 changes the angle α of the inner angle of the first wiper portion 11 and the second wiper portion 12 in accordance with the angle of the corner portion.

[0018] The first lip portion 31 and the second lip portion 51 are made of the same elastic material as the lip connecting portion 22. The ends 31a and 51a of the first lip portion 31 and the second lip portion 51 are joined together at a joint portion 62. The joint portion 62 extends linearly from the apex of the rounded corner portion 61a of the connecting portion 61, which is located between the adjacent corners of the mounting base plate 23 of the first mounting portion 21 and the second mounting portion 41, toward the lip tip portion 33 of the machine tool wiper 10.

[0019] Here, as shown in Figure 2, the first lip portion 31 and the second lip portion 51 have an internal angle α centered on the joint portion 62, corresponding to the corner portion that scrapes off foreign matter. In this embodiment, an example is shown in which the internal angle α of the first lip portion 31 and the second lip portion 51 is selected to be 90°, and in a front view from direction F in Figure 1, the first lip portion 31 and the second lip portion 51 are arranged in an L-shape.

[0020] In this embodiment, an example is shown in which the internal angle α of the first lip portion 31 and the second lip portion 51 is selected to be 90°. However, the present invention is not limited to this, and for example, the internal angle α of the first lip portion 31 and the second lip portion 51 may be selected to be acute or obtuse. The first wiper portion 11 and the second wiper portion 12 are arranged symmetrically around the CC line (angle 1 / 2α[°] line) regardless of whether the angle α is 90°, acute, or obtuse. The CC line is the angle bisector at the tip joint point S, which will be described later, and will hereinafter also be referred to as the angle bisector C.

[0021] Figure 4A is a cross-sectional view showing the cross-sectional configuration of the first wiper section 11 along line BB in Figure 2. Since the first wiper section 11 and the second wiper section 12 have the same configuration, the following explanation will focus on the first wiper section 11, and the explanation of the second wiper section 12 will be omitted to avoid repetition.

[0022] The lip connecting portion 22 of the first mounting portion 21 has a thin-walled substrate mounting portion 22a with a thickness of approximately 0.05 to 5 mm, and the end of the first lip portion 31 is integrally molded to one side 25 that extends in the longitudinal direction of the thick-walled portion. The first lip portion 31 includes a bent portion 27, an extended portion 32, and a lip tip portion 33 that protrude from one side 25 of the thick-walled portion of the lip connecting portion 22. The bent portion 27 bends from one side 25 of the lip connecting portion 22 toward the side where the mounting portion substrate 23 of the lip connecting portion 22 is provided, with the bend point being one side 25.

[0023] The extension portion 32 is integrally molded with the end of the bent portion 27 and bends toward the side where the mounting base plate 23 is provided at a larger angle than the bent portion 27. In a side cross-sectional view, the angle between the imaginary line VL extending linearly from the back surface 22b of the lip connecting portion 22, where the mounting base plate 23 is not provided, and the surface direction of the back surface 32b of the extension portion 32 is θ[°]. The extension portion 32 protrudes obliquely at an angle θ with respect to the surface direction of the lip connecting portion 22.

[0024] Near the inner corner boundary between the bent portion 27 and the extended portion 32, a groove 26 is provided along the boundary line so that the extended portion 32 can bend inward in a roughly V-shape. As a result, the thickness of the wall at the boundary between the bent portion 27 and the extended portion 32 is thinner than other parts, making it easier for the extended portion 32 to bend toward the groove 26 and more difficult to bend toward the opposite side.

[0025] The tip of the extended portion 32 has a lip tip portion 33. The lip tip portion 33 contacts the adjacent surface of the corner portion that scrapes off foreign matter and slides along the adjacent surface of the corner portion. The lip tip portion 33 is formed in a wedge shape in cross-section by cutting the tip of the extended portion 32. The lip tip portion 33 has a pointed tip corner portion 33a on the inner corner side (the inner side that contacts the adjacent surface of the corner portion) formed by the first wiper portion 11 and the second wiper portion 12. The lip tip portion 33 also has an opposing corner portion 33b extending outward opposite to the tip corner portion 33a. The lip tip portion 33 slides against the adjacent surface of the corner portion with the pointed tip corner portion 33a, or the portion extending from the tip corner portion 33a to a part of the back surface 32b pressed against it. As shown in Figure 2, the lip tip portion 33 has a straight tip portion 34 in which the tip corner portion 33a extends in a straight line, and a concave tip portion 36 in which the tip corner portion 33a is recessed compared to the straight tip portion 34.

[0026] The straight tip portion 34 is provided on the other non-joined end 31b, 51b side of the first lip portion 31 and the second lip portion 51. The straight tip portion 34 has a tip corner portion 33a formed so as to run parallel to one side 25 of the lip connecting portion 22, which is the boundary between the lip connecting portion 22 of the first mounting portion 21 and the first lip portion 31. The extension portion 32 of the region in which the straight tip portion 34 is formed is also formed so as to run parallel to one side 25 of the lip connecting portion 22. Figure 4A shows the cross-sectional configuration of the first wiper portion 11 in which the straight tip portion 34 is formed. As shown in Figure 4A, in a side cross-sectional view, the width dimension of the lip tip portion 33 from the outer opposing corner portion 33b to the inner tip corner portion 33a of the straight tip portion 34 is selected to be TW1 [mm]. Furthermore, in a side cross-sectional view, the protrusion dimension of the straight tip portion 34 from the non-jointed side portion 22d (the side portion extending along the longitudinal direction of the lip connecting portion 22) 22d of the lip connecting portion 22 on the virtual line VL to the position of the tip corner portion 33a on the virtual line VL is selected to be T1 [mm].

[0027] As shown in Figure 2, the concave tip portion 36 is formed on both sides of the tip joint point S where the tip corners 33a of one end 31a, 51a of the first lip portion 31 and the second lip portion 51 are joined together. Here, Figure 4B is a cross-sectional view showing the cross-sectional configuration of the first wiper portion 11 along the EE line at the position where the concave tip portion 36 is formed in Figure 2. Since the concave tip portion 36 of the first lip portion 31 has the same configuration as the concave tip portion 36 of the second lip portion 51, the following explanation will focus on the concave tip portion 36 of the first lip portion 31, and the explanation of the concave tip portion 36 of the second lip portion 51 will be omitted to avoid repetition.

[0028] As shown in Figure 4B, in a side cross-sectional view, the concave tip portion 36 has a width dimension of TWx [mm] from the outer opposing corner portion 33b to the inner tip corner portion 33a, which is smaller than the width dimension TW1 [mm] of the straight tip portion 34. Also, in a side cross-sectional view, the concave tip portion 36 has a projection dimension of Tx [mm], which is smaller than the projection dimension T1 [mm] of the straight tip portion 34, from the non-joined side portion 22d of the lip connecting portion 22 on the imaginary line VL (the side portion extending along the longitudinal direction of the lip connecting portion 22) to the position of the tip corner portion 33a on the imaginary line VL. In a side cross-sectional view, the concave tip portion 36 has an angle θ between the imaginary line VL extending linearly from the back surface 22b of the lip connecting portion 22 and the surface direction of the back surface 32b of the extension portion 32, and it protrudes diagonally at approximately the same angle θ as the angle θ of the straight tip portion 34.

[0029] Here, Figure 5A is an enlarged detail view of the machine tool wiper 10 shown in Figure 2, enlarged around the tip joint point S. As shown in Figure 5A, in the area where the concave tip portion 36 is formed, in a front view, the width dimension of the extension portion 32 is the same as the width dimension of the extension portion 32 in the area where the straight tip portion 34 is formed, but the width dimension TWx (Figure 4B) of the lip tip portion 33 is smaller than the width dimension TW1 of the lip tip portion 33 in the area where the straight tip portion 34 is formed. In the area where the concave tip portion 36 is formed, because the width dimension TWx of the lip tip portion 33 is smaller than the width dimension TW1 of the lip tip portion 33 of the straight tip portion 34, the protrusion dimension Tx from the side portion 22d of the lip connecting portion 22 is smaller in a plan view, and the tip corner portion 33a of the concave tip portion 36 is more concave than the tip corner portion 33a of the straight tip portion 34.

[0030] In this case, the tip corner 33a of the concave tip portion 36 is formed to be recessed from the end (referred to as the end tip corner) 33d of the tip corner 33a on the other end 31b side of the first lip portion 31, to a virtual line VL1 that extends linearly along the longitudinal direction of the first lip portion 31. The concave tip portion 36 has an inclined recess 37 and a steep recess 38. The inclined recess 37 is formed to be gently inclined and recessed so that the tip corner 33a gradually moves linearly away from the virtual line VL1 toward the tip joint point S from the straight tip portion 34.

[0031] The concave tip portion 36 has a steep recess 38 formed at its end on the side of the tip joint point S of the inclined recess 37. The concave tip portion 36 forms a region between the straight tip portion 34 and the tip joint point S via the steep recess 38, in which the width dimension TWx gradually decreases from TW1 [mm] to TW2 [mm]. The concave tip portion 36 has a point of deepest recess at the boundary position between the inclined recess 37 and the steep recess 38, or at a predetermined position in the steep recess 38, where the width dimension TWx is smallest at this deepest recess, which is TW2. In this embodiment, the inclined recess 37 has a shape such that the tip corner portion 33a slopes linearly from the position of width dimension TW1 and gradually becomes recessed.

[0032] In this embodiment, the tip joint point S is positioned in a front view at a location where a virtual line VL1 extending linearly along the longitudinal direction of the first lip portion 31 from the end tip corner 33d at the other end 31b of the first lip portion 31 and a virtual line VL1 extending linearly along the longitudinal direction of the second lip portion 51 from the end tip corner 33d at the other end 51b of the second lip portion 51 intersect. In this embodiment, the tip joint point S may be provided at a location that perfectly coincides with the intersection of the respective virtual lines VL1 extending along the longitudinal directions of the first wiper portion 11 and the second wiper portion 12, or the tip joint point S may be provided at a location (recessed position) shifted by 0.1 [mm] or less towards the corner 61a of the connecting portion 61 from the intersection of the two virtual lines VL1. The steep recess 38 is formed to connect the end of the inclined recess 37 (the tip corner 33a at the position where the width dimension TWx is smallest in the inclined recess 37) to the tip joint point S, and the recess state of the tip corner 33a changes more steeply than that of the inclined recess 37.

[0033] The steep recess 38 according to this embodiment has a curved shape in which the tip corner 33a is steeply curved and recessed toward the tip joint point S from the inclined recess 37, and the curved tip corner 33a is joined to the tip joint point S. Here, Figure 5B is a schematic diagram for explaining the configuration of the tip corner 33a of the recessed tip 36. The inclination angle of the inclined recess 37 can be adjusted by selecting an inclination reference point VS2 located at a distance W2 outward from the tip joint point S along the angle bisector C at the tip joint point S. That is, the inclined recess 37 is formed along an imaginary inclination line VL6 that connects the inclination reference point VS2 to the position that will be the end 37a of the inclined recess 37 at the tip corner 33a.

[0034] The steep recess 38 is a fillet that passes from the inclined imaginary line VL6 through the tip joint point S. The first lip portion 31 and the second lip portion 51 have tip corner portions 33a formed by the steep recesses 38 on both sides of the tip joint point S, which connect the inclined recess 37 of the first lip portion 31 to the inclined recess 37 of the second lip portion 51 in an arc shape, passing through the deepest point and the tip joint point S.

[0035] Thus, the concave tip portion 36 has a linearly shaped inclined recess 37 formed by linearly recessing the tip corner portion 33a, and a curved, steep recess 38 formed by curvely recessing the tip corner portion 33a of the inclined recess 37 toward the tip joint point S. Here, the width difference {TW1-TW2} [mm] of the concave tip portion 36 relative to the straight tip portion 34 is selected such that when the straight tip portion 34 is pressed against the adjacent surface of the corner portion that scrapes off foreign matter and is slid relative to the adjacent surface, no gap is created between the entire concave tip portion 36 and the adjacent surface. For example, it is desirable to select the width dimension TWx of the concave tip portion 36 such that when the tip corner portions 33a of the first lip portion 31 and the second lip portion 51 are pressed against the adjacent surface of the corner portion, no gap is created between the straight tip portion 34, the concave tip portion 36, and the tip joint point S, respectively.

[0036] The concave tip portion 36 is formed in the region from the tip joint point S of the first lip portion 31 and the second lip portion 51 to a distance L1 [mm]. In this embodiment, it is desirable to select the distance L1 in the concave tip portion 36 such that no gap is created between the concave tip portion 36 and the adjacent surface of the corner portion, and that the stress acting on the concave tip portion 36 when the concave tip portion 36 is pressed against the adjacent surface of the corner portion can be sufficiently reduced.

[0037] Next, the rear configuration of the machine tool wiper 10 will be described. Figure 6A is a rear view showing the rear configuration of the machine tool wiper 10 as seen from direction B in Figure 1. As shown in Figure 6A, in the area where the concave tip portion 36 is formed, the width dimension of the extended portion 32 is selected to be the same as the width dimension of the extended portion 32 in the area where the straight tip portion 34 is formed, and the width dimension of the bent portion 27 is selected to be approximately the same as the width dimension of the bent portion 27 in the area where the straight tip portion 34 is formed. In the area where the concave tip portion 36 is formed, in the rear view, the bent portion 27 and the extended portion 32 are recessed towards the lip connecting portion 22 than the bent portion 27 and extended portion 32 in the area of ​​the straight tip portion 34.

[0038] Figure 6B is an enlarged detail view of the machine tool wiper 10 shown in Figure 6A, centered on the tip joint point S. As shown in Figure 6B, even when viewed from the rear, the protruding dimension Tx (Figure 4B) of the concave tip portion 36 gradually decreases from T1 to T2, from the straight tip portion 34 through the inclined recess 37 to the steep recess 38.

[0039] In Figure 6B, when viewed from the rear, if we define VL4 as a virtual line extending linearly along the side portion 22d of the lip connecting portion 22, the distance between virtual line VL1, which extends linearly along the tip corner 33a of the straight tip portion 34, and virtual line VL4 becomes the protrusion dimension T1 of the straight tip portion 34. Also, when viewed from the rear, if we define VL2 as a virtual line extending linearly parallel to virtual lines VL1 and VL4 from the tip corner 33a of the most recessed position (deepest point) of the concave tip portion 36, the distance between virtual line VL2 and virtual line VL4 becomes the protrusion dimension T2 at the most recessed position of the concave tip portion 36.

[0040] If we define VL5 as a virtual line extending linearly along the linear boundary line 27a between the bent portion 27 and the extended portion 32 at the straight end portion 34, then at the concave end portion 36, as we approach the joint portion 62 from the straight end portion 34, the boundary line 27a between the bent portion 27 and the extended portion 32 is concave, gradually moving away from the virtual line VL5. In a rear view, the bent portion 27 at the concave end portion 36 is concave towards the lip connecting portion 22, and consequently, the width dimension of the lip connecting portion 22 at the concave end portion 36 is smaller than the width dimension of the lip connecting portion 22 at the straight end portion 34.

[0041] (2) Manufacturing method Next, the manufacturing method of the machine tool wiper 10 described above will be explained. The machine tool wiper 10 is manufactured by molding an elastic material using a mold of a predetermined shape, and integrating the lip connecting portion 22 of the first mounting portion 21, the first lip portion 31, the lip connecting portion 22 of the second mounting portion 41, the second lip portion 51, and the connecting portion 61. In this process, the recessed tip portions 36 of the first lip portion 31 and the second lip portion 51 can be formed by molding with a mold.

[0042] The mounting base plates 23 provided on the first mounting portion 21 and the second mounting portion 41 are prepared to match the size of the base plate mounting portion 22a of the lip connecting portion 22. The mounting base plates 23 can be fixed to the surface of the base plate mounting portion 22a of the lip connecting portion 22 by any method to obtain the machine tool wiper 10.

[0043] (3) Action and Effects As described above, the machine tool wiper 10 comprises a first wiper section 11 having a first lip section 31 and a second wiper section 12 having a second lip section 51, with one end 31a of the first lip section 31 and one end 51a of the second lip section 51 joined together, and the first wiper section 11 and the second wiper section 12 arranged at a predetermined angle α. Furthermore, the other ends 31b, 51b of the first lip section 31 and the second lip section 51 each have a straight tip section 34 with a tip corner 33a extending in a straight line, and on both sides of the tip joint point S where the tip corners 33a of the first lip section 31 and the second lip section 51 are joined together, there are recessed tip sections 36 where the tip corner 33a is recessed compared to the straight tip section 34.

[0044] As a result, as shown in Figure 7, the machine tool wiper 10 can slide its first lip portion 31 against one adjacent surface 101 of the corner portion 100, and its second lip portion 51 against the other adjacent surface 102 of the corner portion 100, allowing it to scrape off foreign matter adhering to the adjacent surfaces 101 and 102 with its tip corner portion 33a. Furthermore, even when the machine tool wiper 10 strongly presses the straight tip portions 34 of the first lip portion 31 and the second lip portion 51 against the adjacent surfaces 101 and 102 of the corner portion 100, causing the first lip portion 31 and the second lip portion 51 to slide against the corner portion 100, the stress acting on the tip corner portion 33a in the area where the first lip portion 31 and the second lip portion 51 are joined can be reduced by the concave tip portion 36.

[0045] Furthermore, the concave tip portion 36 is provided with both sides of the tip joint point S, including a steep recess 38 which is steeper than the inclined recess 37, in addition to a gently sloping recess 37. As a result, the machine tool wiper 10 can reliably reduce the stress acting on the tip corner portion 33a around the tip joint point S by the steep recess 38, while ensuring that the tip joint point S is in close contact with the corner portion 100 and that foreign matter on the corner portion 100 is reliably scraped off by the steep recess 38. In addition, the machine tool wiper 10 can also reliably scrape off foreign matter by ensuring that the tip corner portion 33a is in close contact with the adjacent surfaces 101 and 102 of the corner portion 100 even with the gently sloping recess 37.

[0046] Furthermore, in a front view, the machine tool wiper 10 can be configured such that the tip corner 33a of the concave tip 36 is more recessed than the tip corner 33a of the straight tip 34 by changing the protrusion dimension Tx of the concave tip 36, and the angle θ of the extended portion 32 of the concave tip 36 can be made approximately the same as the angle θ of the extended portion 32 of the other straight tip 34 (not just a perfect match, but within a range of error). By making the straight tip 34 and the concave tip 36 approximately the same angle θ, the machine tool wiper 10 can press the tip corner 33a against the corner portion 100 with a uniform force at the same angle θ.

[0047] (4) Other embodiments The present invention is not limited to the embodiments described above, but includes the following modifications to the extent that the objectives of the present invention can be achieved. In the embodiments described above, the tip joint S is positioned at approximately the same location (the same location as the intersection or slightly offset from the intersection) as the intersection of imaginary lines VL1 that extend from each end tip corner 33d at the other end 31b, 51b of the first lip portion 31 and the second lip portion 51, respectively, along the longitudinal direction of the first lip portion 31 and the second lip portion 51, in a front view. However, the present invention is not limited to this.

[0048] Here, Figure 8A is a schematic diagram illustrating the position of the tip joint point according to another embodiment. In Figure 8A, the tip joint point S in the above-described embodiment is denoted as the minimum tip joint point Smin. Also in Figure 8A, when the corner portion 100 is positioned such that, in a front view, one adjacent surface 101 of the corner portion 100 is in contact with a virtual line VL1 extending along the longitudinal direction of the first lip portion 31 from the end tip corner 33d (not shown in Figure 8A) of the first lip portion 31, and the other adjacent surface 102 of the corner portion 100 is in contact with a virtual line VL1 extending along the longitudinal direction of the second lip portion 51 from the end tip corner 33d (not shown in Figure 8A) of the second lip portion 51, the intersection of the virtual line VL1 that is in contact with the right angle between the adjacent surfaces 101 and 102 of the corner portion 100 is defined as the minimum tip joint point Smin.

[0049] As for the position of other tip joint points S, when viewed from the front, one adjacent surface 101 of the corner portion 100 is in contact with a virtual line VL1 extending linearly from the end tip corner 33d of the first lip portion 31 (not shown in Figure 8A; see Figure 5B), and the other adjacent surface 102 of the corner portion 100 is in contact with a virtual line VL1 extending linearly from the end tip corner 33d of the second lip portion 51 (not shown in Figure 8A; see Figure 5B), the tip joint point S may be provided at a position (denoted as maximum tip joint point Smax) that is not in contact with the right angle between the adjacent surfaces 101 and 102 of the corner portion 100 (i.e., the intersection of the virtual line VL1). In Figure 8A, the tip corner 331a of the concave tip portion 371 when the tip joint point S is placed at the maximum tip joint point Smax is shown by a dotted line. The tip corner 331a has a recessed tip portion 371 that, in a front view, is recessed from the imaginary line VL1 extending along the longitudinal direction of the first lip portion 31 and the second lip portion 51 from each end tip corner 33d at the other end of the first lip portion 31 and the second lip portion 51, respectively.

[0050] Here, the maximum tip joint point Smax is located at a position recessed by a distance Wx from the intersection, along the angle bisector C at the intersection where the imaginary line VL1 extending from the end tip corner 33d of the first lip portion 31 intersects with the imaginary line VL1 extending from the end tip corner 33d of the second lip portion 51, in a front view. It is desirable that the tip joint point S be located within the range from the minimum tip joint point Smin to the maximum tip joint point Smax on the angle bisector C at the intersection where the imaginary lines VL1 intersect, recessed by a distance Wx from the intersection.

[0051] In this case, the distance Wx at which the tip joint point S is located is preferably within the range of 0 [mm] to 4.2 [mm] along the line bisector C, with the position of the intersection where the imaginary line VL1 intersects being 0 [mm]. 4.2 [mm] is a value obtained from the assumed amount of pressure ([mm]) × √2 when the tip corner 33a is pressed against the adjacent surfaces 101 and 102 of the corner section 100, respectively. If the tip joint point S is less than 0 [mm], the stress on the tip corner 33a will increase, while if the tip joint point S exceeds 4.2 [mm], the tip corner 33a may lift away from the adjacent surface of the corner section; therefore, it is desirable that the distance be within the above range.

[0052] When the maximum tip joint point Smax is taken as the tip joint point S, as shown in Figure 5B, the inclination angle of the inclined recess 37 can be adjusted by selecting an inclination reference point VS2 located at a distance W2 outward from the tip joint point S, along the angle bisector C at the tip joint point S (in this case, the maximum tip joint point Smax). That is, the inclined recess 37 is formed along the imaginary inclination line VL6, which connects the inclination reference point VS2 to the position that will be the end 37a of the inclined recess 37 at the tip corner 33a. The steep recess 38 becomes a fillet passing from the imaginary inclination line VL6 through the maximum tip joint point Smax.

[0053] Furthermore, if the straight tip portions 34 of the first lip portion 31 and the second lip portion 51 are formed in a recessed shape so that no gap is created between the tip joint point S and the corners of the adjacent surfaces 101 and 102 when they are pressed against and slid against the two adjacent surfaces 101 and 102 that constitute the corner portion 100, the shape of the recess of the recessed tip portion 36 and the distance L1 at which the recessed tip portion 36 is formed on the lip tip portion 33 are not limited to this embodiment, and various shapes and distances L1 may be applied. In addition, the recessed tip portion may be formed in any of the following shapes: curved shape, straight shape, or polygonal shape such as V-shape or W-shape.

[0054] Furthermore, although the above-described embodiment described a machine tool wiper 10 provided with a curved, steep recess 38, the present invention is not limited thereto. For example, as shown in Figure 8B, a machine tool wiper 70 provided with a straight, steep recess 71 may also be used. In this case, the first lip portion 31 and the second lip portion 51 have a tip corner portion 33a formed by the steep recesses 71 on both sides of the tip joint point S, connecting the most recessed position of the inclined recess 37 of the first lip portion 31 to the most recessed position of the inclined recess 37 of the second lip portion 51 in a straight line passing through the tip joint point S. This configuration can also achieve the same effects as the above-described embodiment.

[0055] Furthermore, the above-described embodiment mentions a case where a concave tip portion 36, composed of a linear inclined recess 37 and a curved steep recess 38, is provided on the first lip portion 31 and the second lip portion 51, respectively. However, the present invention is not limited to this. For example, various concave tip portions, such as a concave tip portion consisting only of a V-shaped or curved steep recess, where only the vicinity of the tip joint is concave, may be provided on the first lip portion 31 and the second lip portion 51, respectively.

[0056] Furthermore, in the embodiments described above, machine tool wipers 10 and 70 were described in which a virtual line VL1 extending linearly along the tip corner 33a of the straight tip portion 34 of the first lip portion 31 intersects with a virtual line VL1 extending linearly along the tip corner 33a of the straight tip portion 34 of the second lip portion 51, and a tip joint point S is located at the intersection of these two virtual lines. However, the present invention is not limited to these. For example, as shown in 9A of Figure 9, a machine tool wiper 80a may have a tip joint point S1 located at a position recessed from the intersection of a virtual line extending linearly along the tip corner 33a of the straight tip portion 34 of the first lip portion 31 and a virtual line extending linearly along the tip corner 33a of the straight tip portion 34 of the second lip portion 51.

[0057] The machine tool wiper 80a has a configuration in which the tip joint point S1 is recessed in a V shape by recessed tip portions 82a formed on the first lip portion 31 and the second lip portion 51, respectively. Each recessed tip portion 82a has a linear shape that extends from the end of the tip corner portion 33a of the straight tip portion 34 so as to be linearly inclined toward the recessed tip joint point S1. Even with such a machine tool wiper 80a, even if the straight tip portions 34 of the first lip portion 31 and the second lip portion 51 are pressed firmly against the adjacent surfaces 101 and 102 of the corner portion 100, respectively, and the first lip portion 31 and the second lip portion 51 are slid relative to the corner portion 100, the stress acting on the area where the first lip portion 31 and the second lip portion 51 are joined can be reduced by the recessed tip portion 82a.

[0058] Furthermore, as another embodiment of the machine tool wiper, as shown in 9B of Figure 9, the tip joint point S1 may be recessed in a U-shape by recessed tip portions 82b formed on the first lip portion 31 and the second lip portion 51, respectively. The machine tool wiper 80b has a tip joint point S1 recessed beyond the position where a virtual line extending linearly along the tip corner portion 33a of the straight tip portion 34 of the first lip portion 31 intersects with a virtual line extending linearly along the tip corner portion 33a of the straight tip portion 34 of the second lip portion 51. Each recessed tip portion 82b has a curved shape that extends curvely from the end of the tip corner portion 33a of the straight tip portion 34 toward the recessed tip joint point S1. In such a machine tool wiper 80b, as in the embodiment described above, the stress acting on the region where the first lip portion 31 and the second lip portion 51 are joined can be reduced by the recessed tip portion 82b.

[0059] Furthermore, as another embodiment of the machine tool wiper, as shown in 9C of Figure 9, the machine tool wiper 80c may be made in which the tip joint point S1 is recessed into a semicircular or C-shape by recessed tip portions 82c formed on the first lip portion 31 and the second lip portion 51, respectively. The machine tool wiper 80c has a tip joint point S1 at a position recessed from the point where a virtual line extending linearly along the tip corner portion 33a of the straight tip portion 34 of the first lip portion 31 intersects with a virtual line extending linearly along the tip corner portion 33a of the straight tip portion 34 of the second lip portion 51. Each recessed tip portion 82c has a curved shape that extends curvely from the end of the tip corner portion 33a of the straight tip portion 34 toward the recessed tip joint point S1. In such a machine tool wiper 80c as well, the stress acting on the region where the first lip portion 31 and the second lip portion 51 are joined can be reduced by the recessed tip portion 82c, similar to the embodiment described above.

[0060] Furthermore, as shown in Figure 10A, a machine tool wiper 90a may also be provided with reinforcing parts 81 made of canvas or the like on the back surface 32b of the extended portion 32 of the first lip portion 31 and on the back surface of the bent portion 27. In this case, the second lip portion 51 is also provided with reinforcing parts 81 on the back surface 32b of the extended portion 32 and on the back surface of the bent portion 27, similar to the first lip portion 31. In the machine tool wiper 90a, recessed tip portions 36, 82a, 82b, and 82c are formed on the lip tip portions 33 of the first lip portion 31 and the second lip portion 51, respectively, which are provided with plate-shaped or sheet-shaped reinforcing parts 81. Such a machine tool wiper 90a can also achieve the same effects as the embodiment described above.

[0061] Furthermore, as a configuration in which the width dimension of the lip tip portion 33 is changed to change the protruding dimension Tx at the concave tip portion 36, for example, the width dimension of the bent portion 27 of the first lip portion 31 and the second lip portion 51 and / or the lip tip portion 33 may be adjusted so as to change the protruding dimension Tx at the concave tip portion 36 while keeping the angle θ the same. Even with such a machine tool wiper, the presence of the concave tip portion allows the stress acting on the tip corner portion 33a of the area where the first lip portion 31 and the second lip portion 51 are joined to be reduced compared to conventional wipers by the concave tip portion 36.

[0062] Furthermore, in the embodiments described above, a configuration was described in which the protrusion dimension Tx at the concave tip portion 36 is changed while keeping the angle θ of the extended portion 32 of the first lip portion 31 and the second lip portion 51 the same. However, the present invention is not limited to this. As shown in Figure 10B, the angle θ of the extended portion 32 of the first lip portion 31 and the second lip portion 51 may be changed to an angle θx (>θ) to change the protrusion dimension Tx at the concave tip portion 36.

[0063] Furthermore, in the embodiments described above, the first lip portion 31 and the second lip portion 51 were provided with a tip corner 33a having a straight tip portion 34 and a concave tip portion 36, but the present invention is not limited thereto. For example, as shown in Figure 11A, a machine tool wiper 80d may have a first lip portion 31 and a second lip portion 51 having a tip corner 33a consisting only of a concave tip portion 36. In this case, an inclined recess 37 is formed from each end tip corner 33d at the other ends 31b, 51b of the first lip portion 31 and the second lip portion 51, inclined toward the tip joint point S. In this case as well, both sides of the tip joint point S have recessed tip portions 36 that, in a front view, are recessed from the respective end tip corners 33d at the other ends 31b, 51b of the first lip portion 31 and the second lip portion 51, respectively, and are recessed from the imaginary line VL1 extending along the longitudinal direction of the first lip portion 31 and the second lip portion 51, respectively, and the same effects as in the embodiment described above can be achieved.

[0064] Furthermore, the steep recess 38 shown in Figure 11A may be provided as the recess tip portions 82a, 82b, and 82c shown in 9A, 9B, and 9C of Figure 9.

[0065] Furthermore, as shown in Figure 11B, a machine tool wiper 80e may be provided without a straight tip portion 34 and a steep recess portion 38, and instead have a recessed tip portion consisting only of an inclined recess portion 37 that slopes toward the tip joint point S from the end tip corner portion 33d.

[0066] (5) Verification Test Next, the machine tool wiper 10 according to this embodiment, which has a concave tip portion 36 on the lip tip portion 33, was designated as Example 1 and Example 2, while a conventional machine tool wiper without a concave tip portion 36 on the lip tip portion 33 (see Japanese Patent Publication No. 2006-95651) was designated as Comparative Example 1 and Example 2. As a verification test, a CAE (Computer Aided Engineering) analysis test was performed. In addition, a pressing test was also performed as a verification test for Example 1 and Comparative Example 1.

[0067] The difference between Example 1 and Example 2 is whether or not the first lip portion 31 and the second lip portion 51 have reinforcing portions 81. Example 1 is a machine tool wiper with reinforcing portions 81, and Example 2 is a machine tool wiper without reinforcing portions 81. The difference between Example 1 and Comparative Example 1 is whether or not the lip tip portion 33 has a concave tip portion 36. The difference between Example 2 and Comparative Example 2 is whether or not the lip tip portion 33 has a concave tip portion 36.

[0068] Furthermore, in both Examples 1 and 2 and Comparative Examples 1 and 2, the internal angle α[°] of the first wiper section 11 and the second wiper section 12 was set to 90[°]. In Examples 1 and 2, the distance L1 from the tip joint point S to the formation of the concave tip section 36 in the first lip section 31 and the second lip section 51 was set to 27[mm]. In the examples, the width dimension TW1 of the straight tip section 34 was set to 3[mm], and the width dimension TW2 of the most recessed position (deepest point) of the concave tip section 36 was set to 1.8[mm]. The steep recess 38 was made into an arc shape with R4[mm] that passes through the deepest point and the tip joint point S.

[0069] Then, Examples 1 and 2 and Comparative Examples 1 and 2, as well as the corner sections that are pressed against Examples 1 and 2 and Comparative Examples 1 and 2, were created using a 3D modeler and CAE analysis was performed. In the CAE analysis, the machine tool wiper of Example 1, which has reinforcing sections 81 (Figure 10A) made of canvas on the back surface 32b of the extended portion 32 of the first lip portion 31 and the second lip portion 51 and on the back surface of the bent portion 27, was configured to be attached to a wall.

[0070] In Example 1, the first lip portion 31 and the second lip portion 51 were made of rubber, and canvas was provided as a reinforcing portion 81. The first mounting portion 21 and the second mounting portion 41, the wall portion on which the machine tool wiper is installed, and the adjacent surfaces of the corner portion were made of rigid bodies. The coefficient of friction between the reinforcing portion 81 and the adjacent surfaces of the corner portion was set to 0.2. A fillet of R4 [mm] was provided at the corner between one adjacent surface and the other adjacent surface of the corner portion.

[0071] In the CAE analysis of Example 2, a machine tool wiper without the reinforcing portion 81 was mounted on the wall. Example 2 had the same configuration as Example 1 except that the reinforcing portion 81 was not provided. The coefficient of friction between the back surface 32b of the tip corner portion 33a and the extension portion 32 and the adjacent surface of the corner portion was set to 0.2. Comparative Examples 1 and 2 also had the same configuration as Examples 1 and 2, with a machine tool wiper mounted on the wall, and CAE analysis was performed using a corner portion with a fillet of R4 [mm].

[0072] In the CAE analysis, the tip corners 33a of the first lip portion 31 and the second lip portion 51 of the machine tool wiper installed on the wall, and the back surface 32b of the extension portion 32 were pressed 3 mm against the adjacent surface of the corner, thereby pressing the machine tool wiper diagonally against the corner by 4.24 mm. CAE analysis was performed on the deformation, pressing reaction force, contact pressure, and stress distribution of each machine tool wiper at that time. Furthermore, the maximum contact pressure, maximum principal stress, and pressing reaction force obtained were compared between Example 1 and Comparative Example 1, and between Example 2 and Comparative Example 2, and the effect was evaluated as a percentage.

[0073] In the pressure test, three samples each were prepared for the machine tool wipers of Example 1 and Comparative Example 1, and each machine tool wiper was pressed against the corner for 1 hour at a pressure of 4.2 [mm]. After leaving the samples undisturbed for 1 hour, the force [N] applied to the samples (the force applied at the moment 1 hour had elapsed, hereinafter referred to as the test force) was measured using a TGI-50kN (MinebeaMitsumi). The average value of the test force (average pressure test force) was also calculated for each of Example 1 and Comparative Example 1. The CAE analysis results and measurement results obtained from the pressure test for Example 1 and Comparative Example 1 are shown in Table 1, and the CAE analysis results for Example 2 and Comparative Example 2 are shown in Table 2.

[0074] [Table 1]

[0075] [Table 2]

[0076] The percentage of the average pressure test force in Table 1 represents the ratio of the average pressure test force of Example 1 to that of Comparative Example 1, with the average pressure test force of Comparative Example 1 set to 0[%]. The pressure reaction force in Tables 1 and 2 represents the force applied to the entire lip portion. The maximum contact pressure and maximum principal stress represent the forces applied near the tip joint point S. The percentages of the maximum contact pressure and maximum principal stress in Table 1 represent the ratios of the maximum contact pressure and maximum principal stress of Example 1 to that of Comparative Example 1. The percentages of the maximum contact pressure and maximum principal stress in Table 2 represent the ratios of the maximum contact pressure and maximum principal stress of Example 2 to that of Comparative Example 2.

[0077] In Example 1, it was confirmed that the average value of the pressing test force, the maximum value of the contact surface pressure, and the maximum principal stress were significantly reduced compared to the values ​​in Comparative Example 1. This confirmed that by providing the concave tip portion 36, the stress acting around the tip joint point S of the first lip portion 31 and the second lip portion 51 can be significantly reduced when the concave tip portion 36 is pressed against the corner portion without creating a gap. In Example 2, it was also confirmed that the average value of the pressing test force, the maximum value of the contact surface pressure, and the maximum principal stress were significantly reduced compared to the values ​​in Comparative Example 2. It was confirmed that the stress acting around the tip joint point S of the first lip portion 31 and the second lip portion 51 can be significantly reduced regardless of the presence or absence of the reinforcing portion 81. [Explanation of symbols]

[0078] 10, 70, 80a, 80b, 80c, 90a, 90b Wipers for machine tools 11. First wiper section 12. Second wiper section 21 First mounting section 25 per side 31 First lip section 33 Lip tip 34 Straight tip 36,82a,82b,82c Concave tip 37 Inclined recess 38,71 Steep depression 41 Second mounting section 51 Second lip section S,S1 tip junction

Claims

1. A first wiper section having a first lip section, A second wiper section having a second lip section, Equipped with, A machine tool wiper in which one end of the first lip portion and one end of the second lip portion are joined, and the first wiper portion and the second wiper portion are arranged at a predetermined angle, A machine tool wiper, wherein on both sides of the tip joint point where the tip corners of the first lip portion and the second lip portion are joined, there are recessed tip portions that, in a front view, are recessed from the respective tip corners of the other ends of the first lip portion and the second lip portion, respectively, by imaginary lines extending along the longitudinal direction of the first wiper portion and the second wiper portion.

2. The aforementioned tip joint is, When the position where the imaginary line extending from the tip corner of the end portion of the first lip portion intersects with the imaginary line extending from the tip corner of the end portion of the second lip portion is defined as an intersection, the following arrangement is made along the angle bisector of the intersection, within the range between the intersection and a position recessed at a predetermined distance from the intersection: A wiper for a machine tool as described in claim 1.

3. The concave tip portion is formed in one of the following shapes: curved, straight, or polygonal. A wiper for a machine tool as described in claim 1.

4. The aforementioned concave tip portion is A sloping recess in which the tip corner gradually indents toward the tip joint point, The device has at least one of the following: a steep recess where the concave state of the tip corner changes abruptly toward the tip joint point side, A wiper for a machine tool as described in claim 1.

5. The concave tip portion is formed in such a recessed shape that, when the respective tip corners of the first lip portion and the second lip portion are pressed against and slide against two adjacent surfaces constituting a corner portion, no gap is created between the tip joint point and the corners of the adjacent surfaces. A wiper for a machine tool according to any one of claims 1 to 4.

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