Sliding surface cover

Abstract

To provide a sliding surface cover which can be used for a long period of time without limiting the moving range of each of three moving bodies on the same sliding surface, and can be applied to small and medium size machines.SOLUTION: The sliding surface cover M includes a rear cover body including a cover A, a cover B, a cover D, and a cover F, which are central cover bodies, and a front cover body including a cover C, a cover G, and a cover E, and the central cover body, the rear cover body, and the front cover body are fixed such that left end edges or right end edges of the central cover body, the rear cover body, and the front cover body extend in an alternating direction with cover bodies adjacent to each other in the front-rear direction on the same plane. An engaging part capable of engaging with the rear end edge of the other adjacent cover body arranged in front so as to cover it from above is formed at the front end edge of each cover body, and the fixed body and the moving body are provided with at least one of an insertion hole and a notch through which at least one of the center cover body, the rear cover body and the front cover body can be inserted.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a sliding surface cover intended to protect a sliding surface on which a moving body can slide from foreign matter. [Background technology]

[0002] For example, in an NC lathe as a machine tool, three moving bodies generally exist on the same sliding surface. The three moving bodies are a rest (also called a steady rest), a tool post, and a tailstock or counterheadstock. A cover is provided to protect the sliding surface on which the moving bodies are mounted from foreign matter such as chips and cutting fluid. When the moving bodies move independently, the following types of sliding surface covers are known: a telescopic cover covering the spaces between the moving bodies, and a separate manual cover providing protection. It is common technical knowledge in the technical field related to NC lathes that the axial direction of the spindle, i.e., the direction in which the three moving bodies can slide, is referred to as the Z-axis direction. Therefore, following this common technical knowledge, the sliding direction of the moving bodies may also be referred to as the Z-axis direction in this disclosure.

[0003] A telescoping cover is a cover formed by connecting multiple covers of similar shapes with overlapping portions. The individual covers move relative to each other to increase or decrease the overlapping portion, allowing the telescoping cover to follow the movement of the moving object. Therefore, even if the moving object moves, the telescoping cover can maintain its covering state over the sliding surface. However, telescopic covers require space between each moving body to fold them, which impairs the proximity of the moving bodies. In particular, in the case of lathes with a long center distance, i.e., when the sliding surfaces are long and the stroke of the moving bodies is large, the number of telescopic covers becomes very large, which makes the structure complicated and significantly impairs the proximity of the moving bodies.

[0004] The divided manual placement cover does not follow the movement of the moving body, so the operator must change the position of the manual placement cover every time the processing position or workpiece changes. Also, because it is placed manually, it is obvious that it cannot be automated.

[0005] Meanwhile, the applicant has disclosed a sliding surface cover device that solves the above-mentioned problems in Patent Document 1. As shown in FIGS. 1 and 2, the sliding surface cover device of Patent Document 1 is composed of a first center cover M2 and a second center cover M5 disposed above a sliding surface 101 extending in the Z-axis direction, and a first front cover M4 and a second front cover M7, as well as a first rear cover M3 and a second rear cover M6, which sandwich the first center cover M2 and the second center cover M5 from the front and rear to cover the entire sliding surface. Furthermore, the first center cover M2 is fixed to the rest 103 on the tool post 104 side, and the second center cover M5 is fixed to the tailstock 105 on the tool post 104 side. In addition, the first front cover M4 and the first rear cover M3, which sandwich the first center cover M2, are fixed to the rest 103 side of the tool post 104, and the second front cover M7 and the second rear cover M6, which sandwich the second center cover M5, are fixed to the tailstock 105 side of the tool post 104. The tool rest 104 is provided with insertion holes 104b through which the first central cover M2 and the second central cover M5 are inserted. With this configuration, unlike a telescopic cover, the movable bodies can be brought close to each other. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-66380 Summary of the Invention [Problem to be solved by the invention]

[0007] However, as shown in FIG. 2, the sliding surface cover device disclosed in Patent Document 1 has a structure in which the first central cover M2 and the second central cover M5 intersect in the vertical direction, i.e., the Y-axis direction, with respect to the sliding surface 101. This requires a large height L in the Y-axis direction of the insertion hole 104b provided in the tool post 104. This poses a problem in that it is difficult to apply the structure to small and medium-sized machines due to space limitations. In other words, in order to apply the structure disclosed in Patent Document 1 to small and medium-sized machines, the height L of the insertion hole 104b needs to be kept small. To reduce the height of the insertion hole 104b, a structure in which the first and second central covers M2 and M5, which should intersect vertically, are positioned at the same height, as shown in FIG. 3 , is conceivable. However, this structure entails the possibility of the first and second central covers M2 and M5 colliding with each other or slipping out of the insertion hole 104b of the tool post 104. To avoid these possibilities, it is necessary to limit the distance the movable bodies can approach and move apart. However, if a movement limit is imposed on the movable body, the structure has the drawback of limiting the user's machining range. Furthermore, even if a movement limit is imposed on the movable body, the structure still has the possibility of an operator accidentally moving the movable body beyond its operating range and damaging the sliding surface cover during assembly or maintenance of the sliding surface cover device with the operation limit interlock turned off. In addition, this structure inevitably causes the sheet metal covers to rub against each other, which poses a problem of wear over long periods of use.

[0008] Therefore, the present disclosure has been made in consideration of the above problems, and aims to provide a sliding surface cover that does not limit the range of movement of each of multiple moving bodies on the same sliding surface, can be used for a long period of time, and is applicable to small and medium-sized machines. [Means for solving the problem]

[0009] In order to achieve the above object, a first configuration of the present disclosure is a sliding surface that includes a guide extending in the left-right direction, at least three movable bodies that can move along the guide are arranged on the guide, and a fixed body that is fixed at least to the left of the leftmost movable body or to the right of the rightmost movable body is arranged, and the sliding surface cover is capable of covering from above between the movable bodies and between the fixed bodies and the movable bodies, and includes a central cover body that is arranged to be able to cover at least the front-to-rear center of the sliding surface, a rear cover body that is arranged to be able to cover the rear part of the sliding surface and whose front end edge engages with the rear end edge of the central cover body, and a front cover body that is arranged to be able to cover the front part of the sliding surface and whose rear end edge engages with the front end edge of the central cover body, and the central cover body, rear cover body, and front cover body extend left and right. It is a long member, and the left or right edge is fixed to one of the movable bodies so that each cover body extends on the same plane and alternates left and right with the adjacent cover bodies in the front and rear, and the central cover body is fixed to the movable body at the left or right end, and the front edge of the rear cover body and the central cover body is formed with a first engagement portion that can engage with the rear edge of the other adjacent cover body located in front from above so as to cover the rear edge of the other adjacent cover body located in front, and the movable body and the fixed body are provided with at least one insertion hole and notch through which at least one of the central cover body, rear cover body and front cover body can be inserted, and at least one of the central cover body, rear cover body and front cover body is inserted into the insertion hole and notch provided in at least two movable bodies. Another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the rear cover body further includes a second cover body whose front end edge engages with the rear end edge of the central cover body, and a first cover body whose front end edge engages with the rear end edge of the second cover body, and the front cover body further includes a third cover body whose rear end edge engages with the front end edge of the central cover body, and a fourth cover body whose rear end edge engages with the front end edge of the third cover body, and the front end edges of each of the first cover body, second cover body, and third cover body are formed with second engagement portions that can engage with the rear end edges of other adjacent cover bodies located forward so as to cover them from above. Another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the sliding surface having a guide is defined as the first sliding surface, and the second sliding surface is further provided with a second sliding surface cover body that can cover from above the second sliding surface, which is arranged behind the first sliding surface and has a guide extending in the left-right direction, and on which at least one movable body that can move along the guide is arranged, and between the first sliding surface and the second sliding surface, there is provided a fixed cover body whose front end edge engages with the rear end edge of the rear cover body and whose rear end edge engages with the front end edge of the second sliding surface cover body, and third engagement portions are formed on the front end edges of the second sliding surface cover body and the fixed cover body so as to engage with the rear end edge of another adjacent cover body arranged forward from above. Yet another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, at least one of the central cover body, rear cover body, and front cover body is divided into multiple pieces in the left-right direction, the multiple cover bodies divided from the same cover body are arranged so that adjacent ends can overlap in the vertical direction, and other cover bodies adjacent to the divided multiple cover bodies in the front-to-back direction have at least one but not more than the same number of first engagement portions, second engagement portions, and third engagement portions arranged in the vertical direction at the edge where the divided multiple cover bodies engage, and each of the arranged multiple first engagement portions, second engagement portions, and third engagement portions engages with the corresponding divided multiple cover bodies. Yet another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the fixed cover body includes a lubricant oil supply device capable of supplying lubricant oil between the fixed cover body and the rear cover body. [Effects of the Invention]

[0010] According to the present disclosure, the sliding surface cover is formed by arranging a plurality of cover bodies, each of which is fixed to a plurality of movable bodies on the same sliding surface, in parallel with the sliding direction of the movable bodies, on the same plane so that each cover body extends alternately in the left-right direction with respect to the adjacent cover body in the front and rear. Furthermore, each movable body is formed with an insertion hole through which a cover body fixed to another movable body can be inserted. Note that, in the present disclosure, the insertion hole refers to a portion through which a cover body can be inserted, and includes not only a complete hole shape but also a notch-shaped hole. This completely protects the sliding surfaces between the movable bodies and between the fixed body and the movable body, allowing each movable body to move independently without any operational restrictions. This reduces machining time and allows for compatibility with a variety of equipment specifications. Even if the cover bodies are formed to extend long in the sliding direction of the movable bodies, they do not interfere with each other, ensuring close proximity between adjacent movable bodies. Furthermore, because the cover bodies move along with the movable bodies, automation is easily achieved. Furthermore, the height of the insertion holes formed in the movable bodies can be kept small, making this system applicable to small and medium-sized machines. Furthermore, multiple cover bodies are stacked and engaged in order, with adjacent cover bodies positioned on top of each other at the rear. Therefore, when the sliding surface is tilted downward toward the front, as is the case with many NC lathes, for example, foreign matter that falls onto the sliding surface cover can move forward without getting caught between adjacent cover bodies. This prevents foreign matter from entering the interior of the cover through the gaps between the covers, effectively protecting the sliding surface. According to another aspect of the present disclosure, the rear cover body and the front cover body are divided in the front-rear direction into first to fourth cover bodies, so that the cover bodies can be inserted through the minimum number of insertion holes that match the shape of the movable body, making it easier to apply to small and medium-sized machines. Furthermore, according to another aspect of the present disclosure, the first sliding surface and the second sliding surface can be continuously covered via the fixed cover without forming any unevenness, thereby preventing foreign matter from accumulating between the first sliding surface and the second sliding surface. According to another aspect of the present disclosure, the cover body is provided divided in the left and right direction, which makes it possible to reduce the overall length of the machine in the sliding direction of the moving body. According to another aspect of the present disclosure, lubricating oil can be supplied between the fixed cover body and the rear cover body, thereby preventing wear between the fixed cover body and the rear cover body and enabling long-term use. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 10 is an explanatory diagram showing a cross section of the front-rear center of a conventional sliding surface cover. [Figure 2] FIG. 2 is an explanatory diagram showing a cross section taken along line TT in FIG. [Figure 3] FIG. 10 is an explanatory diagram for examining the application of a conventional sliding surface cover to small and medium-sized machines. [Figure 4] 1 is a plan view of a first sliding surface of a sliding surface cover of the present disclosure. FIG. [Figure 5] FIG. 5 is an explanatory diagram showing a cross section taken along line VV in FIG. [Figure 6] FIG. 10 is an explanatory diagram showing a cover body fixed to a rest. [Figure 7] FIG. 4 is an explanatory diagram showing a cover body fixed to a tool post. [Figure 8] FIG. 10 is an explanatory diagram showing a cover body fixed to a tailstock. [Figure 9] FIG. 4 is an explanatory diagram showing a cover body fixed to a headstock. [Figure 10] 6 is an explanatory diagram showing a cross section of an NC lathe provided with a sliding surface cover of the present disclosure, taken along a position corresponding to line YY in FIG. 5. [Figure 11] FIG. 6 is an explanatory diagram showing a cross section taken along the line WW in FIG. 5. [Figure 12] FIG. 6 is an explanatory diagram showing a cross section taken along line XX in FIG. 5. [Figure 13] FIG. 6 is an explanatory diagram showing a cross section taken along line YY in FIG. 5. [Figure 14] FIG. 6 is an explanatory diagram showing a cross section taken along line ZZ in FIG. 5. [Figure 15] FIG. 10 is a plan view of a sliding surface cover of another embodiment, taken along a first sliding surface. [Figure 16] FIG. 16 is an explanatory diagram showing a cross section taken along line ww in FIG. [Figure 17]FIG. 16 is an explanatory diagram showing a cross section taken along line yy in FIG.

[0012] In the cross-sectional views in this disclosure, in order to simplify the drawings for the purpose of clearly explaining the sliding surface cover, only the end faces on the cross-sectional lines and the configurations close to the cross-sectional lines are shown. Furthermore, in the drawings in this disclosure, components such as a drive unit and a housing that are necessary for an actually operable device are omitted as appropriate. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. As shown in Figures 4 and 5, an NC lathe as a machine tool has guides 1,1 formed on the top of a bed (not shown) that extend in the left-right direction and are parallel to the front-to-rear direction. A headstock 2, a rest 3, a tool rest 4, and a tailstock 5 are provided on the guides 1,1. The headstock 2 is a fixed body fixed to the bed. The rest 3, the tool rest 4, and the tailstock 5 are movable bodies that are arranged on the guides 1,1 and can move in the left-right direction along the guides 1,1. Furthermore, in the NC lathe, second guides 11, 11 are provided behind the guide 1 in parallel with the guide 1, as shown in FIG. A second tool rest 41 is disposed on the second guides 11, 11 as a movable body that is movable in the left-right direction along the second guides 11, 11. The guides 1, 1 are the first sliding surface in the present disclosure, and the second guides 11, 11 are the second sliding surface in the present disclosure. Therefore, in the following description, the guides 1, 1 may be referred to as the first sliding surface 6, and the guides 11, 11 may be referred to as the second sliding surface 61. Furthermore, the rest 3, the tool post 4, and the tailstock 5 may collectively be referred to simply as the moving body. The NC lathe is operated by an NC device (not shown). The NC device includes a CPU and a memory connected to the CPU, and realizes its operation by using these.

[0014] In this application, the direction in which the headstock 2 is arranged in Fig. 4 is referred to as the left, and the direction in which the tailstock 5 is arranged is referred to as the right. The up and down directions in Fig. 5 are referred to as the up and down directions in this disclosure. Furthermore, the depth direction in Fig. 5 is referred to as the front and rear directions in this disclosure. As mentioned above, the NC lathe is assembled to the device so that the bed slopes downward toward the front. In other words, the vertical and depth directions defined above in the drawings of the present disclosure differ from the vertical and front-to-rear directions of the NC lathe assembled as a device, as shown in FIG. 10, i.e., the actual vertical and front-to-rear directions. However, to clearly describe the slideway cover of the present disclosure, the directions in the following description will be based on the above definitions. When specifically indicating a direction as a device, the modifier "of the device" is used before the direction.

[0015] The NC lathe further includes a slide surface cover M having a plurality of cover bodies for protecting the first slide surface 6 from foreign matter such as chips and cutting fluid. As shown in Figures 4 to 6 and 11, a cover A is fixed from the left side to the front side of the rest 3, with a width sufficient to protect the entire area in the front-to-rear direction from above, except for a portion of the rear end side of the first sliding surface 6. The cover A is formed so that its cross section in the front-to-rear direction is an inverted L-shape, and covers not only the upper side but also the front of the first sliding surface 6. The cover A is one of the central cover bodies in the present disclosure. Cover A is provided so as to pass through a headstock insertion hole 2a formed in the lower part of the headstock 2, approximately in the center in the front-to-back direction. The left-to-right length of cover A is such that the left edge of cover A does not slip out of the headstock insertion hole 2a even when the rest 3 is moved to the farthest position from the headstock 2 within the movable range of the rest 3. Furthermore, the vertical length of the front end of cover A is formed to be such that the lower edge is positioned below the upper edge of the first sliding surface 6. The lower part of cover A is capable of housing part of cover E, as will be described later. The rear end edge of the cover A is movably engaged as an engaged portion A2 with an engaging portion D1 formed on the front end edge of the cover D, which will be described later.

[0016] As shown in Figures 4 to 6, 10, and 12 to 14, a cover B having a width sufficient to protect a part of the rear end side of the first sliding surface 6 from above is fixed to the right rear end of the rest 3. The cover B is a flat plate-like member extending in the left-right direction. The cover B is one of the rear cover bodies and also serves as a second cover body in the present disclosure. Cover B passes through tool post insertion hole 4a formed in the lower part of tool post 4, approximately in the center from front to back, and also passes through tail stock rear notch 5a formed behind tail stock 5, and is provided so that at least the right end of cover B is housed inside cover I, which will be described later. Furthermore, the length of cover B in the left-right direction is long enough that cover B will not come out of tail stock rear notch 5a even when it is moved to the farthest position from tail stock 5 within the movable range of rest 3. The rear end edge of cover B is movably engaged as engaged portion B2 with engaging portion D1 formed on the front end edge of cover D, which will be described later. Also, on the front end edge of cover B, engaging portion B1 is formed as a first engaging portion and a second engaging portion, and is movably engaged with the rear end edge of cover H, which will be described later, as engaged portion H2.

[0017] As shown in Figures 4, 6, 10, and 12 to 14, a cover C having a width sufficient to protect a portion of the front end side of the first sliding surface 6 from above is fixed to the right front end of the rest 3. The cover C is a flat plate-like member extending in the left-right direction. The cover C is one of the front cover bodies and one of the third cover bodies in the present disclosure. Cover C passes through tool post insertion hole 4a and also passes through tailstock front notch 5b formed in front of tailstock 5, and is provided so that at least the right end of cover C is housed inside cover G, which will be described later. Depending on the relative positions of tool post 4 and tailstock 5, at least the right end of cover C may be housed inside cover I together with the right end of cover G. Furthermore, the length of cover C in the left-right direction is long enough that it will not slip out of tailstock front notch 5b even when it is moved to the farthest position from tailstock 5 within the movable range of rest 3. The rear end edge of the cover C is movably engaged as an engaged portion C2 with an engaging portion H1 formed on the front end edge of the cover H. Also, the front end edge of the cover C is formed with the engaging portion C1 as a first engaging portion and a second engaging portion, and the rear end edge of a cover E (described later) is movably engaged as an engaged portion E2.

[0018] As shown in Figures 4-5, 7, and 11-12, a cover D having a width sufficient to protect a portion of the rear end side of the first sliding surface 6 from above is fixed to the left rear end of the tool post 4. The cover D is a flat plate-like member extending in the left-right direction. The cover D is one of the rear cover bodies and one of the first cover bodies in the present disclosure. Cover D passes through rest rear notch 3a formed in the rear lower part of rest 3 and also passes through headstock insertion hole 2a of headstock 2, with the left end of cover D protruding to the left of headstock 2. Furthermore, the length of cover D in the left-right direction is such that the left edge of cover D does not slip out from the right edge of cover A even when tool rest 4 is moved to the farthest position from headstock 2 within the movable range of the tool rest 4. The rear edge of cover D is movably engaged as engaged portion D2 with engaging portion J1 formed on the front edge of cover J, which will be described later. Also, on the front edge of cover D, engaging portion D1 is formed as a second engaging portion, and as described above, the rear edge of cover A as engaged portion A2 and the rear edge of cover B as engaged portion B2 are movably engaged therewith.

[0019] 4, 7, and 12, a cover E is fixed to the left front end of the tool post 4, with a width sufficient to protect a portion of the front side of the first sliding surface 6 from above. The cover E is formed so that its cross section in the front-to-rear direction is an inverted L-shape, and covers not only the upper side but also the front of the first sliding surface 6. The cover E is one of the front cover bodies and is the fourth cover body in the present disclosure. Cover E passes in front of rest 3 and is provided so that at least the left end of cover E is housed inside cover A. The length of cover E in the left-right direction is such that the left edge of cover E does not slip out from the right edge of cover A even when tool post 4 is moved to the farthest position from headstock 2 within the movable range of tool post 4. Furthermore, the length of the front end of cover E in the up-down direction is such that the lower edge is positioned below the upper edge of first sliding surface 6. As described above, the rear end edge of the cover E is movably engaged with the engaging portion C1 formed on the front end edge of the cover C as the engaged portion E2.

[0020] As shown in Figures 4-5, 7, 10, and 13-14, a cover F having a width sufficient to protect a portion of the rear end side of the first sliding surface 6 from above is fixed to the right rear end of the tool post 4. The cover F is a flat plate-like member extending in the left-right direction. The cover F is one of the rear cover bodies and one of the first cover bodies in the present disclosure. Cover F passes through tailstock rear notch 5a of tailstock 5, and is provided so that at least the right end of cover F is stored below cover I, i.e., inside cover I. Furthermore, the length of cover F in the left-right direction is such that the right edge of cover F does not slip out from the left edge of cover I even when tool post 4 is moved to the farthest position from tailstock 5 within the movable range. The rear end edge of the cover F is movably engaged as an engaged portion F2 with an engaging portion J1 formed on the front end edge of a cover J, which will be described later. Also, the front end edge of the cover F is formed with an engaging portion F1 as a second engaging portion, and the rear end edge of a cover H, which will be described later, is movably engaged as an engaged portion H2.

[0021] As shown in Figures 4, 7, 10, and 13-14, a cover G is fixed to the right front end of the tool post 4, with a width sufficient to protect a portion of the front side of the first sliding surface 6 from above. The cover G is formed so that its cross section in the front-to-rear direction is an inverted L-shape, and covers not only the upper side but also the front of the first sliding surface 6. The cover G is one of the front cover bodies in the present disclosure. Note that, although the cover G is not divided into a third cover body and a fourth cover body as a front cover body, it can be said to be one of the third covers in terms of its relationship with the cover H. The cover G passes through the tailstock front notch 5b of the tailstock 5, and is arranged so that at least the right end of the cover G is housed inside the cover I. The length of the cover G in the left-right direction is such that the right edge of the cover G does not slip out from the left edge of the cover I even when the tool post 4 is moved to the farthest position from the tailstock 5 within the movable range of the tool post 4. Furthermore, the length of the front end of the cover G in the up-down direction is formed to be such that the lower edge is positioned below the upper edge of the first sliding surface 6. The rear edge of cover G is movably engaged as engaged portion G2 with engaging portion H1 formed on the front edge of cover H. An engaging portion G1 is formed on the underside of a portion of cover G parallel to first sliding surface 6, and when cover C is stored inside cover G, it engages with engaging portion C1 of cover C and supports the front edge of cover C.

[0022] As shown in Figures 4-5, 8, 10, and 12-13, a cover H having a width sufficient to protect from above a portion of the first sliding surface 6 approximately in the center from front to back, is fixed to the left side of the tailstock 5. The cover H is a flat plate-like member extending in the left-right direction. The cover H is one of the central cover bodies of the present disclosure. The cover H is arranged so that it can pass through the tool rest insertion hole 4a, as well as through a rest insertion hole 3c formed in the lower part of the rest 3 at approximately the center in the front-to-back direction, and through the headstock insertion hole 2a of the headstock 2. The length of the cover H in the left-right direction is such that the left edge of the cover H does not come out of the rest insertion hole 3c even when the tailstock 5 and the rest 3 are moved to their furthest positions within the range in which the tailstock 5 is movable and the range in which the rest 3 is movable. As described above, the rear edge of cover H is movably engaged as engaged portion H2 with engaging portion B1 formed on the front edge of cover B. Also, on the front edge of cover H, an engaging portion H1 is formed as a first engaging portion having two engaging portions arranged vertically, and as described above, the rear edge of cover C as engaged portion C2 and the rear edge of cover G as engaged portion G2 are movably engaged therewith.

[0023] As shown in Figures 4 to 5, 8 and 14, a cover I is fixed to the right side of the tailstock 5, with a width sufficient to protect the entire front-to-rear area of ​​the first sliding surface 6 from above. The cover I is formed so that its cross section in the front-to-rear direction is an inverted L-shape, and covers not only the upper side but also the front of the first sliding surface 6. The cover I is one of the central cover bodies in the present disclosure. The length of the cover I in the left-right direction is long enough to protect the first sliding surface 6 on the right side of the tailstock 5 even when the tailstock 5 and the headstock 2 are moved to the positions closest to each other within the range in which the tailstock 5 can move. As described above, the lower part of cover I can accommodate a part of cover B, a part of cover C, a part of cover F, and a part of cover G. An engaging part I1 is formed on the lower surface of the part of cover I that is parallel to first sliding surface 6, and when cover C and cover G are stored inside cover I, it engages with the rear end edge of cover C as engaged part C2 and the rear end edge of cover G as engaged part G2, and supports the rear end edges of cover C and cover G. The rear end edge of the cover I is movably engaged as an engaged portion I2 with an engaging portion J1 formed on the front end edge of the cover J, which will be described later.

[0024] Furthermore, as shown in Figs. 4, 9, and 10 to 14, the sliding surface cover M is provided with a cover J at the rear right end of the headstock 2, which also functions as a guide rail for the covers D, F, and I. The cover J is a flat plate-like member extending in the left-right direction. As the headstock 2 is a fixed body as described above, the cover J is also a fixed body and does not move. The cover J is a fixed cover in the present disclosure. An engaging portion K1 formed on the front edge of the cover K, which will be described later, is movably engaged as an engaged portion J2 with the rear edge of the cover J. Also, an engaging portion J1 as a third engaging portion, in which two engaging portions are arranged vertically side by side, is formed on the front edge of the cover J, and as described above, the rear edge of the cover D as the engaged portion D2, the rear edge of the cover F as the engaged portion F2, and the rear edge of the cover I as the engaged portion I2 are movably engaged with the engaging portion J1.

[0025] 10 to 14, a cover K is fixed to the second tool rest 41, covering the entire front-rear area of ​​the second sliding surface 61 from above. The cover K is a flat plate-like member extending in the left-right direction. The cover K is the second sliding surface cover body in the present disclosure. The front edge of the cover K is formed with an engaging portion K1 as a third engaging portion, which is movably engaged with the rear edge of the cover J as the engaged portion J2, as described above. Therefore, the first sliding surface 6 and the second sliding surface 61 can be continuously covered via the cover J without forming any unevenness, thereby preventing foreign matter from accumulating between the first sliding surface 6 and the second sliding surface 61.

[0026] In the sliding surface cover M configured as described above, cover A and cover D cover the upper and front of the first sliding surface 6 between the headstock 2 and the rest 3. In addition, cover B, cover C, cover D, cover E, and cover H cover the upper and front of the first sliding surface 6 between the rest 3 and the tool rest 4. Furthermore, even when the tailstock 5 moves to the left and the right end of the tailstock 5 and the first sliding surface 6 separate, cover I covers the upper and front of the first sliding surface 6 on the right side of the tailstock 5. In addition, cover F, cover G, and cover H cover the upper and front of the first sliding surface 6 between the tool rest 4 and the tailstock 5. Cover A passes through the headstock insertion hole 2a, and covers B and C pass through the tool post insertion hole 4a and the tailstock rear notch 5a or the tailstock front notch 5b, respectively. Covers D and E pass through the headstock insertion hole 2a and the rest rear notch 3a or the rest front notch 3b, respectively. Covers F and G pass through the tailstock rear notch 5a or the tailstock front notch 5b, respectively. Cover H passes through the headstock insertion hole 2a, the rest insertion hole 3c, and the tool post insertion hole 4a. Furthermore, cover A has a length that prevents its left edge from slipping out of the headstock insertion hole 2a even when the movable body moves arbitrarily. Covers B, F, and G have a length that prevents its right edge from slipping out of the left edge of cover I even when the movable body moves arbitrarily. Cover C has a length that prevents its right edge from slipping out of the left edge of cover G even when the movable body moves arbitrarily. Covers D and E have a length that prevents its left edge from slipping out of the headstock insertion hole 2a even when the movable body moves arbitrarily. Cover H has a length that prevents its left edge from slipping out of the rest insertion hole 3c even when the movable body moves arbitrarily. Therefore, regardless of the position of the movable body, the first sliding surface 6 can be completely protected by the sliding surface cover M. Also, the movable bodies, namely the rest 3, tool post 4, and tailstock 5, can be moved independently without any operational restrictions. This reduces machining time and makes it possible to accommodate a variety of specifications.

[0027] In addition, because covers A to H of the sliding surface cover M are arranged side by side in the front-to-rear direction, even if covers A to H are formed long in the left-to-right direction, they do not interfere with each other and the accessibility between adjacent moving bodies is not impaired. Furthermore, because covers A to I are each fixed to one of the moving bodies and move in accordance with the moving body, they can easily be automated.

[0028] As shown in FIG. 11, the covers A and D are arranged on approximately the same plane by engaging the engaged portions A2 and the engaging portions D1. Furthermore, as shown in Figure 12, covers B, C, D, E and H are arranged on approximately the same plane by engaging with engaged portion B2 and engaging portion D1, engaging portion H2 and engaging portion B1, engaging portion C2 and engaging portion H1, and engaging portion E2 and engaging portion C1. Furthermore, as shown in Figure 13, covers B, F, G and H are arranged on approximately the same plane by engaging with the engaging portion F1 at the engaging portion B2 and with the engaging portion H1 at the engaging portion G2. Since cover E is housed inside cover A, cover C is housed inside cover G, and covers B, F, and G are housed inside cover I, there is a slight overlap between the top and bottom, but as described above, covers A to I are arranged on approximately the same plane that slopes downward toward the front as a whole. Therefore, the heights of the headstock insertion hole 2a, rest rear notch 3a, rest front notch 3b, rest insertion hole 3c, tool rest insertion hole 4a, tailstock rear notch 5a, and tailstock front notch 5b can be minimized, making it possible to apply the sliding surface cover M to small and medium-sized machines.

[0029] Furthermore, because covers A to H of slide surface cover M are arranged side by side in the front-to-rear direction, the covers will not collide with each other even if they move as the moving body moves. Also, because wear between the covers is minimized, damage to slide surface cover M is prevented, enabling slide surface cover M to be used for a long period of time.

[0030] In addition, in the embodiment of the present disclosure, in the covers A to J, the engaging portions formed on the front edge of the rearwardly disposed cover are each formed in a U-shape that opens forward, and the rear edge of the front-positioned cover, which is the mating engaging portion, is inserted into and engaged with the engaging portion of the rearwardly positioned cover as the engaged portion. The engaging portions and engaged portions of the covers J and K are formed so that they engage with each other in a shape that wraps around them when the front edge of the cover K is positioned upward. When assembled, the NC lathe equipped with the slideway cover M of this embodiment is positioned so that the front of the first slideway 6 faces diagonally downward toward the front of the device, as shown in FIG. 10 . In this case, the front edge of the rear cover covers the rear edge of the front cover, allowing foreign matter such as chips and cutting fluid that falls onto the top surface of the slideway cover M from above the device to move forward (diagonally downward toward the front of the device). This prevents foreign matter from entering the inside of the covers through gaps between the covers, effectively protecting the first slideway 6. Furthermore, because foreign matter can move forward on the top surface of the slideway cover M without getting caught between the covers, a foreign matter discharge device (not shown) can be disposed in front of the first slideway 6 to efficiently discharge the foreign matter outside the device.

[0031] As shown in FIGS. 4 and 13-14 , the slideway cover M is equipped with a lubricant supplying device 7 that supplies lubricant to the engagement between the cover J and the covers D and F within the range of movement of the tool post 4, which moves the most frequently and moves at the fastest speed among the movable bodies. The lubricant supplying devices 7 are located below the cover J, one on each side of the tool post 4 in FIG. 4 . The lubricant supplying devices 7 are connected to a lubricant storage tank (not shown) via a supply line (not shown) located on the underside of the cover J. In the embodiment of the present disclosure, the lubricant supplying device 7 is a discharge nozzle that can discharge lubricant using a known means such as a solenoid valve, and is assumed to be operated by an NC device. The lubricant supplying device 7 may be operated by an operator at a predetermined timing, or may be automatically performed by incorporating a discharge operation into the machining program. The lubricating oil supply device 7 makes it possible to supply sufficient lubricating oil evenly to the engagement portions between the cover J and the covers D and F within the movement range of the tool post 4. Therefore, the supplied lubricating oil prevents wear between the covers due to sliding, allowing the sliding surface cover M to be used for a long period of time.

[0032] Furthermore, wipers (not shown) are provided in each of the headstock insertion hole 2a, rest rear notch 3a, rest front notch 3b, rest insertion hole 3c, tool post insertion hole 4a, and tailstock rear notch 5a. The wipers are all provided near both the left and right sides of each of the headstock insertion hole 2a, rest rear notch 3a, rest front notch 3b, rest insertion hole 3c, tool post insertion hole 4a, and tailstock rear notch 5a so that their tips come into contact with the upper surface of the sliding surface cover M. Therefore, even if foreign matter adheres to the upper surface of the sliding surface cover M when the movable body moves, it is swept away by the wiper, preventing the foreign matter from entering the headstock insertion hole 2a, rest rear notch 3a, rest front notch 3b, rest insertion hole 3c, tool rest insertion hole 4a, and tailstock rear notch 5a. Therefore, foreign matter can be prevented from entering the headstock 2 and the movable body, preventing the occurrence of unnecessary malfunctions.

[0033] The sliding surface cover M of the above configuration is provided with guides 1, 1 extending in the left-right direction, and on the guides 1, 1, a rest 3, tool rest 4, and tailstock 5, which are movable along the guides 1, 1 in this order from left, are arranged, and the fixed headstock 2 is arranged to the left of the rest 3, which is the leftmost movable body, on the first sliding surface 6. The sliding surface cover M is capable of covering from above the spaces between the rest 3, tool rest 4, and tailstock 5, as well as the space between the headstock 2 and the rest 3, and is a central cover body arranged so as to be able to cover at least the front-rear center of the first sliding surface 6. The cover includes covers A, H, and I, a cover B which is a second cover body arranged to be able to cover the rear part of the first sliding surface 6 and whose front end edge engages with the rear end edge of the central cover body, and a rear cover body including covers D and F which are first cover bodies whose front end edge engages with the rear end edge of the second cover body, covers C and G which are third cover bodies arranged to be able to cover the front part of the first sliding surface 6 and whose rear end edge engages with the front end edge of the central cover body, and a cover E which is a fourth cover body whose rear end edge engages with the front end edge of the third cover body. The center cover body, rear cover body, and front cover body are elongated members extending in the left and right directions, and the left or right end edges are fixed to either the rest 3, the tool post 4, or the tailstock 5 so that each cover body extends alternately in the left and right direction on the same plane with the adjacent cover bodies in the front and rear directions, and the center cover body is fixed to the rest 3 and the tailstock 5, and the front end edges of the first cover body, the second cover body, and the third cover body are fixed to the rear end edges of the adjacent cover bodies arranged in front of them from above. Engagement portions B1 to D1, F1 and H1 are formed which can be engaged to cover the headstock 2, rest 3, tool post 4 and tailstock 5, and the headstock insertion hole 2a, rest rear notch 3a, rest front notch 3b, rest insertion hole 3c, tool post insertion hole 4a and tailstock rear notch 5a are provided on the headstock 2, rest 3, tool post 4 and tailstock rear notch 5a through which at least one of the central cover body, rear cover body and front cover body can be inserted, and cover B is inserted into the tool post insertion hole 4a and tailstock rear notch 5a, and cover H is inserted into the tool post insertion hole 4a and rest insertion hole 3c.

[0034] This completely protects the areas between the rest 3, tool post 4, and tailstock 5, the area between the headstock 2 and rest 3, and the first sliding surface 6 on the right side of the tailstock 5. The rest 3, tool post 4, and tailstock 5 can move independently without any operational restrictions. This reduces machining time and allows for compatibility with a variety of equipment specifications. Even if each cover is formed to extend long in the sliding direction of the moving body, the covers do not interfere with each other, and the proximity between adjacent moving bodies is not impaired. Furthermore, because each cover moves in accordance with the moving body, automation is easily accommodated. Furthermore, the height of the insertion holes formed in the moving body can be kept small, making the system applicable to small and medium-sized machines. Furthermore, the covers are stacked and engaged in order so that the adjacent rear covers are positioned on top of each other. Therefore, for example, if the first sliding surface 6 is positioned with a downward slope toward the front, foreign matter that falls onto the sliding surface cover M can move forward of the first sliding surface 6 without getting caught between the adjacent covers. This prevents foreign matter from entering the inside of the covers through the gaps between the covers, effectively protecting the first sliding surface 6. In addition, by dividing the rear cover body and the front cover body in the front-rear direction into first to fourth cover bodies, the cover bodies can be inserted through the minimum number of insertion holes that match the shape of the movable body, making it easier to apply to small and medium-sized machines.

[0035] The slide mechanism further includes a cover K, which is a second sliding surface cover body that is arranged behind the first sliding surface 6 having the guides 1,1, and is provided with second guides 11,11 extending in the left-right direction, and is capable of covering from above the second sliding surface 61 on which the second tool post 41 that is movable along the second guides 11,11 is arranged, and between the first sliding surface 6 and the second sliding surface 61 is provided a cover J, which is a fixed cover body whose front end edge engages with the rear end edge of the rear cover body and whose rear end edge engages with the front end edge of the second sliding surface cover body, and the front end edges of the covers K and J are formed with engagement portions K1, J1 that can engage with the rear end edge of another adjacent cover body arranged in front of them so as to cover from above.

[0036] Therefore, the first sliding surface 6 and the second sliding surface 61 can be continuously covered via the cover J without forming any unevenness, thereby preventing foreign matter from accumulating between the first sliding surface 6 and the second sliding surface 61.

[0037] The cover J is provided with a lubricant supply device 7 that can supply lubricant between the cover J and the covers D and F.

[0038] Therefore, lubricating oil can be supplied between the cover J and the covers D and F, so that wear between the cover J and the covers D and F can be prevented, enabling use over a long period of time.

[0039] The configuration of the sliding surface cover of the present disclosure is not limited to the aspects described in the above embodiments, and can be modified as needed within the scope of the invention. For example, the slideway cover may be applied to a non-automated lathe other than an NC lathe, or may be applied to a multi-tasking machine. Furthermore, the movable body may include an opposing headstock instead of a tailstock. Furthermore, the number of movable bodies is not limited as long as it is three or more. When the rear cover body and the front cover body are divided parallel to the sliding direction of the movable body, the rear cover body and the front cover body may each be divided into N-1 covers, where N is the number of movable bodies. Furthermore, in the above embodiment, cover C is stored below cover G, but the front-to-rear width of cover C and cover G may be reduced and the front edge of cover C may be engaged with the rear edge of cover G, so that cover C serves as the third cover body and cover G serves as the fourth cover body. This design allows the size of the tool post insertion hole and the tailstock front notch to be reduced, making it even easier to apply to small machines. Furthermore, the type of engagement between the covers, including the shape of the engagement portion, can be designed arbitrarily as long as the front end edge of a cover body located at the rear can engage with the rear end edge of another adjacent cover body located at the front from above, and the engaged covers can move freely relative to each other within a range that does not allow foreign matter to enter the sliding surface. Furthermore, the shape and number of the lubricating oil supply portions can be set arbitrarily as long as sufficient lubricating oil can be supplied between the fixed cover body and the rear cover body.

[0040] Next, another embodiment of the present disclosure will be described with reference to the drawings. In the following description, components that are the same as those described in the above embodiment and components that have equivalent functions will be given the same reference numerals, and duplicated descriptions will be omitted.

[0041] If the center distance of the NC lathe is long, i.e., if the first sliding surface 6 is longer laterally than usual, the dimensions of covers A to I will all be larger in the left-right direction. As a result, for example, if the rest 3 moves to the left and approaches the headstock 2, the protrusion width of cover A from the left end of the first sliding surface 6 will increase, or if the tool rest 4 moves to the right and moves away from the headstock 2, the protrusion width of covers F and G from the right end of the first sliding surface 6 will increase. Therefore, when assembling them into the device, the overall length of the device will increase to allow for the increased protrusion width.

[0042] Therefore, in the sliding surface cover M1, the covers A, F, and G in the sliding surface cover M are each divided into two in the left-right direction, resulting in covers a1 and a2, covers f1 and f2, and covers g1 and g2, as shown in Figures 15 to 17. Two cover bodies divided from the same cover body are arranged so that adjacent ends overlap in the vertical direction. Here, the left end of cover a1 overlaps the upper side of the right end of cover a2, the right end of cover f1 overlaps the upper side of the left end of cover f2, and the right end of cover g1 overlaps the upper side of the left end of cover g2.

[0043] Further, at the front edge of the cover D, two engaging portions D1a and D1b are arranged in parallel in the vertical direction to engage with the rear end a12 of the cover a1 and the rear end a22 of the cover a2 as engaged portions, respectively. Furthermore, two engaging portions J1a and J1b that engage with the rear end portion f12 of cover f1 and the rear end portion f22 of cover f2, respectively, are arranged side by side in the vertical direction on the front edge of cover J. Also, on the rear edge of cover B, engaged portions B2a and B2b that engage with the engaging portion f1a formed on the front end portion of cover f1 and the engaging portion f2a formed on the front end portion of cover f2, respectively, are formed. Furthermore, two engaging portions H1a and H1b are arranged vertically side by side on the front edge of the cover H, which engage with the rear end portion g12 of the cover g1 and the rear end portion g22 of the cover g2 as engaged portions. In addition, because cover B engages with cover f1, the vertical positional relationship between cover B and cover H changes compared to the sliding surface cover M. To accommodate this, an engaging portion B1a is formed on the front edge of cover B, which appears to have two engaging portions arranged side by side, one above the other.

[0044] The right edge of cover a1 is fixed to the left side of rest 3. On the other hand, cover a2 is not fixed to rest 3 but is supported by engagement with cover D. Therefore, cover a2 does not move and remains in the same position. The left-right length of cover a1 and cover a2 is set to a length that will prevent cover a1 and cover a2 from separating when rest 3 moves to the right to the maximum extent. A wiper is provided on the underside of the left end of cover a1 so that its tip comes into contact with the upper surface of cover a2. This prevents foreign matter from entering the interior of cover a1 through the gap between cover a1 and cover a2 when cover a1 moves.

[0045] The left end of cover f1 is fixed to the right side of the tool post 4. On the other hand, cover f2 is not fixed to the tool post 4 but is supported by engagement with cover J and cover B. Therefore, cover f2 does not move and remains in the same position. The left-right length of covers f1 and f2 is set so that covers f1 and f2 do not separate when the tool post 4 moves to the left to its maximum extent. A wiper is provided on the underside of the left end of cover f1 so that its tip comes into contact with the upper surface of cover f2. This prevents foreign matter from entering the interior of cover f1 through the gap between cover f2 and cover f2 when cover f1 moves.

[0046] Furthermore, the left end of cover g1 is fixed to the right side of the tool post 4. On the other hand, cover g2 is not fixed to the tool post 4 but is supported by engagement with cover H. Therefore, cover g2 does not move and remains in the same position. The left-right length of covers g1 and g2 is set so that covers g1 and g2 do not separate when the tool post moves to the leftmost position. A wiper is provided on the underside of the left end of cover g1 so that its tip comes into contact with the top surface of cover g2. This prevents foreign matter from entering the interior of cover g1 through the gap between cover g1 and cover g2 when cover g1 moves.

[0047] The sliding surface cover M1 configured as described above is a so-called telescopic cover, and covers a2, f2, and g2 can be stored below it while adjusting the amount of overlap between covers a1, f1, and g1. Therefore, compared to when a single cover body is used, the protrusion width from the left and right ends of the first sliding surface 6 can be reduced, and the overall length of the device can be kept short. The covers a2, f2, and g2 may be provided with a known mechanism that can maintain a fixed position by interference with fixed bodies such as the guides 1, 1 and the headstock 2. Alternatively, the covers a2, f2, and g2 may be provided with, for example, a known drive mechanism that can automatically adjust the amount of overlap with the covers a1, f1, and g1, respectively.

[0048] Furthermore, the sliding surface cover that is divided in the left-right direction may include not only the center cover body and the rear cover body but also the front cover body, or only a predetermined cover body may be divided in the left-right direction. The number of divisions in the left-right direction may be three or more. Furthermore, any mechanism other than the above-described mechanism can be applied to adjust the overlapping amount between the divided covers. [Explanation of symbols]

[0049] 1·· Guide, 2·· Headstock (fixed body), 3·· Rest (moving body), 4·· Tool rest (moving body), 5·· Tailstock (moving body), 6·· First sliding surface (sliding surface), 7·· Lubricating oil supply device, 61·· Second sliding surface, A to K·· Covers (center cover body, rear cover body, front cover body, first cover body, second cover body, third cover body, fourth cover body, fixed cover body, second sliding surface cover body), M, M1·· Slide surface cover.

Claims

1. A sliding surface cover is provided which is capable of covering from above between the moving bodies and between the fixed bodies and the moving bodies, on a sliding surface which has guides extending in the left-right direction, at least three moving bodies which are movable along the guides arranged on the guides, and a fixed body which is fixed at least to the left of the leftmost moving body or to the right of the rightmost moving body, a central cover body arranged to be able to cover at least the center of the front and rear of the sliding surface; a rear cover body arranged to be able to cover the rear part of the sliding surface, the front end edge of which engages with the rear end edge of the central cover body; and a front cover body arranged to be able to cover the front part of the sliding surface, the rear end edge of which engages with the front end edge of the central cover body, The central cover body, the rear cover body, and the front cover body are elongated members extending in the left and right directions, and the left end edge or the right end edge is fixed to one of the movable bodies so that each cover body extends alternately in the left and right direction with the adjacent cover body in the front and rear on the same plane, and the central cover body is fixed to the left end or the right end of the movable body, a first engaging portion is formed on a front end edge of each of the rear cover body and the central cover body, the first engaging portion being engageable with a rear end edge of another adjacent cover body disposed forward so as to cover the rear end edge of the other adjacent cover body from above; the movable body and the fixed body are provided with at least one of an insertion hole and a notch through which at least one of the central cover body, the rear cover body, and the front cover body can be inserted, A sliding surface cover characterized in that at least one of the central cover body, the rear cover body, and the front cover body is inserted into the insertion holes and the notches provided in at least two of the movable bodies.

2. the rear cover body is further divided into a second cover body, the front end edge of which engages with the rear end edge of the central cover body, and a first cover body, the first cover body being disposed rearward of the second cover body and the front end edge of which engages with the rear end edge of the second cover body; the front cover body is further divided into a third cover body, the rear end edge of which engages with the front end edge of the central cover body, and a fourth cover body, the fourth cover body being disposed in front of the third cover body and the rear end edge of which engages with the front end edge of the third cover body; The sliding surface cover according to claim 1, characterized in that a second engagement portion is formed on the front end edge of each of the first cover body, the second cover body, and the third cover body, which can engage with the rear end edge of another adjacent cover body located in front so as to cover it from above.

3. the sliding surface including the guide is defined as a first sliding surface, and a second sliding surface cover body is further provided which is capable of covering from above a second sliding surface which is disposed behind the first sliding surface, includes a guide extending in the left-right direction, and has at least one movable body disposed on the guide that is movable along the guide; a fixed cover body between the first sliding surface and the second sliding surface, the front end edge of which engages with the rear end edge of the rear cover body and the rear end edge of which engages with the front end edge of the second sliding surface cover body; The sliding surface cover according to claim 1 or 2, characterized in that a third engagement portion is formed on the front end edge of each of the second sliding surface cover body and the fixed cover body, which can engage with the rear end edge of another adjacent cover body located in front so as to cover it from above.

4. At least one of the central cover body, the rear cover body, and the front cover body is divided into a plurality of parts in the left-right direction, and the plurality of cover bodies divided from the same cover body are arranged so that adjacent ends can overlap in the up-down direction, In another cover body adjacent to the divided cover bodies in the front-rear direction, at least one of the first engaging portion and the second engaging portion is arranged in parallel in the vertical direction at an edge where the divided cover bodies are engaged, and the number of the first engaging portion and the second engaging portion is equal to or less than the number of the divided cover bodies, 3. The sliding surface cover according to claim 2, wherein at least one of the plurality of first engaging portions and the plurality of second engaging portions arranged side by side engages with a corresponding one of the plurality of divided cover bodies.

5. 4. The sliding surface cover according to claim 3, wherein the fixed cover body is provided with a lubricating oil supply device capable of supplying lubricating oil between the fixed cover body and the rear cover body.

6. At least one of the central cover body, the rear cover body, and the front cover body is divided into a plurality of parts in the left-right direction, and the plurality of cover bodies divided from the same cover body are arranged so that adjacent ends can overlap in the up-down direction, In another cover body adjacent to the divided cover bodies in the front-rear direction, at least one of the first engaging portion and the third engaging portion is arranged in parallel in the vertical direction at an edge where the divided cover bodies are engaged, and the number of the first engaging portion and the third engaging portion is equal to or less than the number of the divided cover bodies, 4. The sliding surface cover according to claim 3, wherein at least one of the plurality of first engaging portions and the plurality of third engaging portions arranged side by side engages with a corresponding one of the plurality of divided cover bodies.

7. 7. The sliding surface cover according to claim 6, wherein the fixed cover body is provided with a lubricating oil supply device capable of supplying lubricating oil between the fixed cover body and the rear cover body.

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