Cover device for machine tool, and machine tool

Abstract

To provide a cover device of a machine tool which suppresses a failure and an illegal operation of a lock mechanism and contributes to space saving.SOLUTION: A cover device of a machine tool includes: a cover which is openable and closable with respect to an opening of a device body of the machine tool and has a first cover section 211 which is rotatably supported by the device body and a second cover section 213 which is rotatably supported by the first cover section 211; a first movable body which is connected to the second cover section 213 and moves while being guided by a guide section 251 of the device body provided adjacently to the cover; a second movable body which moves together with the first movable body while being guided by the guide section 251; a key 231 which moves together with the first movable body and the second movable body; and a lock device 233 which can lock the key 231. The key 231 and the lock device 233 are provided on an opposite side of the cover with respect to the guide section 251. The posture of the key 231 is fixed according to the positions of the first movable body and the second movable body.SELECTED DRAWING: Figure 5

Description

Technical Field

[0006] , ,

[0005] , , , ,

[0001] The present invention relates to a cover device and a machine tool provided with the cover device.

Background Art

[0002] In a machine tool that processes a workpiece with a cutting tool, a cover device having an openable and closable cover is generally provided to prevent the scattering of chips and coolant and the intrusion of foreign matter into the machining chamber. As a cover device, a lock mechanism composed of a key and a keyhole is provided, and a configuration in which the cover of the cover device is locked in a closed state is known.

[0003] Patent Document 1 discloses a configuration of a cover device in which a key is provided so as to be exposed on the front side of the device main body of a machine tool, a keyhole into which the key is inserted is provided so as to be exposed on the cover, and the key is inserted into the keyhole as the cover is closed.

Prior Art Document

Patent Document

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as described above, in a configuration in which the key and the keyhole are exposed, for example, when attaching or detaching a cutting tool or a workpiece, the lock mechanism may fail due to a collision of a cutting tool or the like with the key or the keyhole. Further, since the key and the keyhole are arranged at positions easily accessible to the user, unauthorized operation of the lock mechanism is relatively easy, which is not preferable from the viewpoint of safety. On the other hand, if a configuration for covering the key and the keyhole is newly added to the lock mechanism, it may lead to an increase in the size of the lock mechanism and the cover device.

[0006] The present invention has been made in view of the above-mentioned problems, and aims to provide a cover device for a machine tool that suppresses failures and improper operation of the locking mechanism and contributes to space saving. [Means for solving the problem]

[0007] (Aspect 1) To solve the above problems, the cover device according to embodiment 1 of the present invention covers an opening in the main body of a machine tool and is a cover that can be opened and closed relative to the opening, and comprises a first cover portion rotatably supported on the main body of the machine tool about a first rotation axis and a second cover portion rotatably supported on the first cover portion about a second rotation axis parallel to the first rotation axis, and a first movable body connected to the second cover portion, the first movable body moving in a direction perpendicular to the first rotation axis direction while being guided by a guide portion of the main body of the machine tool provided adjacent to the cover in the direction of the first rotation axis, a second movable body moving together with the first movable body while being guided by the guide portion, a key that moves together with the first movable body and the second movable body, and a locking device having a keyhole into which the key is inserted and capable of locking the key, wherein the key and the locking device are provided on the side opposite to the cover with respect to the guide portion in the direction of the first rotation axis, and the orientation of the key is determined by the positions of the first movable body and the second movable body.

[0008] (Aspect 2) In the above embodiment 1, the guide portion is a guide hole that penetrates in the direction of the first rotation axis and extends in a direction perpendicular to the direction of the first rotation axis, and the first moving body and the second moving body It may be configured to be movable within the guide hole in the direction of extension of the guide hole.

[0009] (Aspect 3) In the above embodiment 1 or 2, the first moving body and the second moving body are 1 The roller may have a shaft extending in the direction of the rotation axis and a rotating body that can rotate around the shaft.

[0010] (Aspect 4) In the above embodiment 3, a plate-shaped connecting member is further provided to connect the shaft of the first moving body and the shaft of the second moving body, and the key may be attached to the connecting member and change orientation integrally with the connecting member as the first moving body and the second moving body move.

[0011] (Appendix 5) To solve the above problems, a machine tool according to aspect 5 of the present invention is a machine tool comprising a device body, a tool post, a spindle, and a cover device according to any one of aspects 1 to 4, wherein the tool post and the spindle are arranged inside, and a first space is formed by the device body and the cover, and a second space is formed on the side of the cover by the device body and the guide portion, where the key and the locking device are arranged inside.

[0012] Furthermore, the configurations of each of the above embodiments can be combined and adopted as much as possible. [Effects of the Invention]

[0013] According to the present invention, a cover device for machine tools can be provided that suppresses malfunctions and improper operation of the locking mechanism and contributes to space saving. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a machine tool according to an embodiment. [Figure 2] This is an explanatory diagram of the cover device according to the embodiment. [Figure 3] This is an explanatory diagram of the various components arranged around the key according to the embodiment. [Figure 4] This is an explanatory diagram of the locking mechanism according to the embodiment. [Figure 5] This is an explanatory diagram of the opening and closing operation of the cover according to the embodiment. [Figure 6] This is an explanatory diagram of a cover device relating to a comparative example. [Modes for carrying out the invention]

[0015] Hereinafter, with reference to the drawings, embodiments for carrying out the present invention will be exemplarily and detailedly described based on examples. Note that dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment should be appropriately changed according to the configuration of the device to which the invention is applied and various conditions. That is, the scope of the present invention is not intended to be limited to the following embodiments.

[0016] <Example> [Machine tool] First, the general configuration of the machine tool 100 according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing the appearance of the machine tool 100. The exterior of the machine tool 100 is composed of a device body 10 having openings that open to the upper surface side and the front side of the machine tool 100, and a cover 21 that is provided to be openable and closable so as to cover the openings of the device body 10. The device body 10 has an approximately rectangular parallelepiped shape, and a slope surface inclined with respect to the gravitational direction is formed on the front side.

[0017] The first space H1 inside the device body 10 of the machine tool 100 communicates with the outside of the machine tool 100 through the opening of the device body 10. In the first space H1, a processing chamber for processing a workpiece (cutting object) with a cutting tool is formed. In the processing chamber, a tool post (not shown) to which a cutting tool can be attached and a spindle (not shown) to which a workpiece can be attached are provided. By the relative parallel movement and rotational movement of the cutting tool held by the tool post and the workpiece held by the spindle, cutting processing is performed in the processing chamber.

[0018] ​The machine tool 100 is equipped with a cover device 20 having a cover 21 that covers the opening of the main body 10. When the cover 21 is open, the opening of the main body 10 is exposed, allowing the user to access the machining chamber and attach cutting tools or short workpieces such as raw materials to the machine tool 100 based on the workpiece machining conditions. When the cover 21 is closed, the machining chamber is sealed, ensuring the safety of the user while preventing foreign matter from entering the machining chamber and preventing chips and coolant generated during machining from scattering outside the machine tool 100. In Figure 1, the cover 21 in the closed state is shown by a solid line, and the cover 21 in the open state is shown by a dashed line.

[0019] Furthermore, the cover device 20 has a locking mechanism 23 (see Figure 2) for locking the cover 21 in the closed position. The detailed configuration of the locking mechanism 23 will be described later. For the safety of the user, the machine tool 100 is pre-configured so that cutting cannot be started unless the cover 21 is closed and locked by the locking mechanism 23.

[0020] In the machine tool 100 according to the embodiment, the locking mechanism 23 is located in a second space H2, which is different from the first space H1 in which the machining chamber is formed, and is located to the side of the closed cover 21. The second space H2 is separated from the outside by the main body of the device 10, and the locking mechanism 23 is located in a position that is not easily accessible to the user. This configuration prevents the locking mechanism 23 from being damaged by chips, etc., and also prevents unauthorized operation of the locking mechanism 23.

[0021] Furthermore, a user-operable control panel 41 is provided on the front side of the machine tool 100. The control panel 41 is a user interface for the user to make various settings. Through the control panel 41, the user can create a machining program, have the machine tool 100 perform machining and measurement operations, and switch the lock state of the lock mechanism 23. The control panel 41 is also equipped with a display panel, through which the user can learn about the progress of the machining program, measurement results, and any errors that may have occurred.

[0022] [Cover device] Next, the detailed configuration of the cover device 20 according to this embodiment will be described. Figure 2(a) is a perspective view of the cover device 20, Figure 2(b) is a front view of the cover device 20, and Figure 2(c) is a cross-sectional view AA of Figure 2(b).

[0023] The cover device 20 includes a cover 21, a locking mechanism 23 for locking the cover 21, a guide member 25 for guiding the opening and closing operation of the cover 21, a first roller 27, a second roller 28, and a plate-shaped connecting member 29 for connecting the first roller 27 and the second roller 28.

[0024] The cover 21 is a flip-up cover and has an upper cover body 211 as a first cover part and a front cover body 213 as a second cover part. The upper cover body 211 is rotatably supported on the device body 10 about a first rotation axis L1 and covers the upper part of the opening of the device body 10 when the cover 21 is closed. The front cover body 213 is rotatably supported on the upper cover body 211 about a second rotation axis L2 parallel to the first rotation axis L1 and covers the front part of the opening of the device body 10 when the cover 21 is closed. The first rotation axis L1 and the second rotation axis L2 extend in the left-right direction perpendicular to the front-rear direction of the machine tool 100.

[0025] The front cover body 213 may be supported by a rotating shaft supported by the upper cover body 211, or it may be supported by the upper cover body 211 through a hinge. In other words, a known rotating support mechanism can be applied to the mechanism by which the upper cover body 211 rotatably supports the front cover body 213.

[0026] The front cover body 213 is provided with a handle portion 215 for the user to grip in order to operate the cover 21 during opening and closing operations, and a window 217 for checking the condition of the machining chamber (inside the first space H1) during cutting. When the user grips the handle portion 215 and lifts the front cover body 213, the cover 21 deforms so that the front cover body 213 folds relative to the upper cover body 211, and the cover 21 is opened.

[0027] The guide member 25 is a sheet metal member extending in a direction perpendicular to the first rotation axis L1, and is positioned adjacent to the cover 21 in the direction of the first rotation axis L1. The guide member 25 is formed along the closed cover 21 and has an upper part that extends horizontally and an inclined part that extends forward and downward from the upper part. The guide member 25, together with the device body 10, forms a second space H2 in which the locking mechanism 23 is located. In other words, the guide member 25 functions as a partition plate separating the first space H1 in which the processing chamber is formed from the second space H2 in which the locking mechanism 23 is located.

[0028] The guide member 25 has a guide hole 251 that opens in the direction of the first rotation axis L1. The guide hole 251 extends in a direction perpendicular to the direction of the first rotation axis L1 and is formed along the closed cover 21. The guide hole 251 is a guide portion that guides the cover 21 during the opening and closing operation of the cover 21.

[0029] The first roller 27 and the second roller 28 are positioned inside the guide hole 251 and are configured to rotate about a rotation axis parallel to the direction of the first rotation axis L1. The first roller 27 is connected to the front cover body 213 so as to protrude from the side of the front cover body 213 in the direction of the first rotation axis L1. On the other hand, the second roller 28 is indirectly connected to the front cover body 213 via the connecting member 29 and the first roller 27. When the cover 21 is closed, the second roller 28 is positioned above the first roller 27.

[0030] The first roller 27 is a first moving body that moves inside the guide hole 251, and the second roller 28 is a second moving body that moves inside the guide hole 251. The first roller 27 and the second roller 28 are guided parts that move in the extending direction of the guide hole 251 while being guided by the guide hole 251. That is, the first roller 27 connected to the front cover body 213 is guided into the guide hole 251, so that the cover 21 moves along the guide hole 251 during opening and closing operations. The first roller 27 and the second roller 28, which are connected to each other by the connecting member 29, move together in conjunction inside the guide hole 251.

[0031] The locking mechanism 23 is provided on the side opposite to the cover 21 relative to the guide member 25 in the direction of the first rotation axis L1. The locking mechanism 23 consists of a key 231 connected to the connecting member 29 and a locking device 233 in which a keyhole 233a into which the key 231 is inserted is formed.

[0032] The key 231 is indirectly connected to the front cover body 213 via the connecting member 29 and the first roller 27, and is inserted into and removed from the keyhole 233a as the cover 21 opens and closes. The locking device 233 is positioned so as to overlap the lower and front end of the guide hole 251 when viewed in the direction of the first rotation axis L1, as shown in Figure 2(c).

[0033] Next, referring to Figure 3, we will discuss the detailed configuration of the various components arranged on the side of the cover 21. Let me explain. Figure 3 is a view of the various components arranged around the key 231 on the side of the cover 21, as seen from a direction perpendicular to the rotation axis direction of the first roller 27.

[0034] The first roller 27 has a shaft 271 and a wheel portion 273 which is a rotating body rotatably mounted around the shaft 271. The first roller 27 is provided inside a guide hole 251 so as to protrude on both sides from the guide member 25 in the direction of rotation axis. One end of the shaft 271 in the direction of rotation axis is connected to the front cover body 213, and the other end is connected to a connecting member 29. The cover 21 and the first roller 27 are connected by inserting one end of the shaft 271 into a hole formed in the side surface of the front cover body 213.

[0035] The second roller 28 has a shaft 281 and a wheel portion 283 that is rotatably mounted around the shaft 281. The second roller 28 is installed inside the guide hole 251 so as to protrude on both sides from the guide member 25 in the direction of the rotation axis. One end of the shaft 281 in the direction of the rotation axis is not connected to the cover 21, and a connecting member 29 is connected to the other end. With this configuration, the first roller 27 and the second roller 28 move smoothly while rotating inside the guide hole 251, improving the workability of opening and closing the cover 21.

[0036] The connecting member 29 has holes through which the shafts 271 and 281 pass, and is fixed to the shafts 271 and 281 by fixing members 31 such as nuts. In other words, the connecting member 29 moves integrally with the shafts 271 and 281 while maintaining a constant distance between the first roller 27 and the second roller 28.

[0037] Furthermore, a key holding portion 33 for holding the key 231 is connected to the connecting member 29. The key 231 is held by the key holding portion 33 so as to protrude in the direction of extension of the connecting member 29, from the second roller 28 toward the first roller 27. The key 231 has a locking hole 231a into which a plunger 235, which will be described later, is inserted. The key 231 moves integrally with the shaft 271, shaft 281 and connecting member 29, and its orientation changes integrally with the connecting member 29.

[0038] [Lock action] Next, the locking operation of the locking mechanism 23 will be explained with reference to Figures 4(a) and (b). Both Figures 4(a) and (b) are cross-sectional views taken in the direction of the first rotation axis L1. Figure 4(a) is a cross-sectional view of the locking mechanism 23 in an unlocked state where the key 231 is not locked. Figure 4(b) is a cross-sectional view of the locking mechanism 23 in a locked state where the key 231 is locked.

[0039] The locking mechanism 23 is a solenoid locking type, and the plunger 235 moves by switching between a power supply state and a power cut-off state to a coil (not shown). The locking device 233 also has a locking hole 233b into which the plunger 235 is inserted and removed. In the unlocked state, the plunger 235 is retracted from the locking hole 231a of the key 231 and the locking hole 233b of the locking device 233, and the key 231 can be freely inserted into and removed from the keyhole 233a. On the other hand, in the locked state, the plunger 235 is inserted into the locking hole 231a of the key 231 and the locking hole 233b of the locking device 233, and the key 231 is locked so that it cannot be removed from the keyhole 233a.

[0040] [Opening and closing the cover] Next, the details of the opening and closing operation of the cover 21 will be explained with reference to Figures 5(a) to 5(d). Figures 5(a) to 5(d) are cross-sectional views AA of Figure 2(b) showing the opening and closing operation of the cover 21, and sequentially from Figure 5(a) to Figure 5(d) the cover 21 transitions from the closed state to the open state.

[0041] The guide hole 251 in this embodiment is composed of a first hole portion 251a, a second hole portion 251b, and a bent portion 251c. The first hole portion 251a extends in a horizontal first direction D1 at the upper part of the guide member 25. The second hole portion 251b extends in a second direction D2 that intersects the horizontal and gravity directions at the inclined portion of the guide member 25. The bent portion 251c is located between the first hole portion 251a and the second hole portion 251b and connects the first hole portion 251a and the second hole portion 251b. In the extending direction of the guide hole 251, the first hole portion 251a is located on the rear side of the guide hole 251 relative to the bent portion 251c and constitutes one end of the guide hole 251. On the other hand, in the extending direction of the guide hole 251, the second hole portion 251b is located on the front and lower side of the guide hole 251 relative to the bent portion 251c, and constitutes the other end of the guide hole 251.

[0042] Figure 5(a) shows the first roller 27 and the second roller 28 both located in the second hole 251b, with the key 231 inserted into the keyhole 233a of the locking device 233, and the cover 21 in the closed state. At this time, the upper cover body 211 and the front cover body 213 are arranged along the device body 10 and cover the opening of the device body 10. Also, the extension direction of the key 231 is approximately parallel to the second direction D2.

[0043] Figure 5(b) shows the state when the cover 21 is lifted from the state shown in Figure 5(a), the key 231 is removed from the keyhole 233a, and both the first roller 27 and the second roller 28 are positioned in the second hole 251b. When the closed cover 21 is lifted, the first roller 27 and the second roller 28 move upward in the second direction D2 while being guided by the second hole 251b.

[0044] While the first roller 27 and the second roller 28 are moving within the second hole 251b, the orientation of the connecting member 29 and the key 231, which move together with the first roller 27 and the second roller 28, does not change. That is, the key 231 moves together with the first roller 27 and the second roller 28 with its extension direction approximately parallel to the second direction D2. In addition, the upper cover body 211 rotates upward around the first rotation axis L1, and the front cover body 213 rotates around the second rotation axis L2 so as to fold relative to the upper cover body 211.

[0045] Figure 5(c) shows the state in which the cover 21 is further lifted from the state shown in Figure 5(b), and the first roller 27 and the second roller 28 are in the process of moving from the second hole 251b through the bent portion 251c to the first hole 251a. When the second roller 28, which is located above the first roller 27, moves from the second hole 251b to the bent portion 251c, the orientation of the connecting member 29 and the key 231 begins to change.

[0046] Figure 5(d) shows the state in which the cover 21 is pushed to the rear side of the device body 10 from the state shown in Figure 5(c), the second roller 28 contacts one end of the guide hole 251, and the cover 21 is in the open state. At this time, the first roller 27 and the second roller 28 are located in the first hole 251a, the extension direction of the key 231 is approximately horizontal and approximately parallel to the first direction D1.

[0047] As described above, in the cover device 20, the cover 21 transitions from a closed state to an open state as the first roller 27 and the second roller 28 are guided by the guide hole 251. When transitioning the cover 21 from an open state to a closed state, the above procedure can be performed in reverse order. In the opening and closing operation of the cover 21, the direction of movement of the cover 21 is uniquely determined because the first roller 27 connected to the cover 21 is guided by the guide hole 251, thus improving the operability of the opening and closing operation of the cover 21.

[0048] Furthermore, the second direction D2, which is the extension direction of the second hole 251b, is approximately parallel to the insertion direction of the key 231 into the locking device 233. And, as described above, the first roller 27 and the second roller When rollers 28 move together within the second hole 251b, the key 231 moves linearly in the second direction D2 together with the first roller 27 and the second roller 28, with the extension direction of the key 231 being approximately parallel to the second direction D2. Furthermore, the depth direction of the keyhole 233a of the locking device 233 located near the end of the second hole 251b is parallel to the second direction D2. With this configuration, the insertion / removal (movement) direction of the key 231 when inserting or removing the key 231 from the keyhole 233a coincides with the extension direction of the key 231, ensuring that the insertion and removal of the key 231 is performed accurately and reliably. In particular, according to the configuration of this embodiment, when the key 231 is located near the keyhole 233a, the key 231 moves in parallel without rotating, so even if the length of the key 231 is long, the key 231 can be reliably inserted into or removed from the keyhole 233a.

[0049] Furthermore, when the first roller 27 and the second roller 28 are located in the first hole 251a and the cover 21 is in the open state, the first roller 27 and the second roller 28 are in the same position in the direction of gravity, and the first roller 27 and the second roller 28 are placed on the inner wall of the guide hole 251. In addition, the bent portion 251c extends forward and upward from the first hole 251a, and then extends forward and downward to connect to the second hole 251b. Therefore, a part of the bent portion 251c is located higher than the first hole 251a. With this configuration, when the cover 21 is in the open state, the risk of the cover 21 unintentionally closing due to gravity is reduced, which contributes to ensuring user safety. Furthermore, since the cover 21 is located above the main body 10 of the device, the cover 21 does not protrude forward or to the side of the machine tool 100, preventing the user from interfering with the open cover 21 and contributing to saving space in the installation area of ​​the machine tool 100.

[0050] Furthermore, the key 231 and the locking device 233 are located inside a second space H2 formed on the opposite side of the cover 21, with the guide member 25 in between. The second space H2 is covered by the guide member 25 and the device body 10, except for the guide hole 251 and the movement path of the plunger 235. Therefore, chips and other debris are prevented from interfering with the locking mechanism 23, and the occurrence of failure of the locking mechanism 23 is suppressed. Moreover, since the user cannot easily access the key 231 or the locking device 233, the risk of unauthorized operation of the key 231 or the locking device 233 is reduced, leading to improved user safety.

[0051] Furthermore, similar to this embodiment, if a guide member 25 is provided on the side of the flip-up cover 21 to guide the cover 21, the second space H2 formed on the side opposite to the cover 21 relative to the guide member 25 tends to become dead space. However, with the configuration of this embodiment, the key 231 and the locking device 233 are arranged inside the second space H2, so the dead space can be effectively utilized, contributing to space saving. Moreover, compared to a configuration in which the locking mechanism 23 is arranged inside the processing chamber, with the configuration of this embodiment, the space of the processing chamber is not reduced, and there is no risk of the locking mechanism 23 being damaged by chips or the like.

[0052] Furthermore, since the key 231, shaft 271, and shaft 281 are connected to each other by the connecting member 29, the key 231 moves together with the first roller 27 and the second roller 28, and the position of the connecting member 29 and the key 231 is determined by the position of the first roller 27 and the second roller 28. More specifically, when the first roller 27 and the second roller 28 are located in the second hole 251b, the extension direction of the key 231 is approximately parallel to the second direction D2, which is the extension direction of the second hole 251b. Then, as the first roller 27 and the second roller 28 move from the second hole 251b through the bend 251c to the first hole 251a, the position of the key 231 changes so that the extension direction of the key 231 gradually approaches the horizontal. Subsequently, when the first roller 27 and the second roller 28 are positioned in the first hole 251a, the extension direction of the key 231 becomes approximately horizontal and approximately parallel to the first direction D1, which is the extension direction of the first hole 251a. With this configuration, as the first roller 27 and the second roller 28 move, the posture of the key 231 changes so that the extension direction of the key 231 is aligned with the extension direction of the guide member 25, thereby preventing the guide member 25 from becoming larger and saving space. It contributes to the transformation of the material.

[0053] <Comparative Example> The configuration of the comparative examples will be described below with reference to Figures 6(a) and 6(b), and the space-saving effect of the guide member 25 according to the present invention will be described in more detail. Figure 6(a) is a cross-sectional view showing the configuration of the cover device 50 of Comparative Example 1. Figure 6(b) is a cross-sectional view showing the configuration of the cover device 60 of Comparative Example 2. In the following descriptions of Comparative Examples 1 and 2, components similar to those in the above-described embodiments will be denoted by the same reference numerals and their descriptions will be omitted.

[0054] The cover device 50 of Comparative Example 1 differs from this embodiment in that it does not have a second roller 28 or a connecting member 29, and only the first roller 27 (not shown in Figure 6(a)) is connected to the cover 21. In Comparative Example 1, the key 231 is positioned to overlap with the first roller 27 when viewed in the direction of the opening of the guide hole 251 of the guide member 25.

[0055] In order to ensure that the end face of the cover 21 contacts the device body 10 and reliably closes the opening of the device body 10, it is preferable that the first roller 27 be positioned close to the tip of the cover 21. By connecting the first roller 27, whose direction of movement is restricted, to the tip of the front cover body 213, the effects of bending of the cover 21 and other factors are suppressed when positioning the tip of the cover 21, so that the tip of the cover 21 is positioned more accurately and reliably.

[0056] However, in the configuration shown in Comparative Example 1, where the first roller 27 is connected to the tip of the front cover body 213 and the key 231 is provided near the first roller 27, the locking device 233 needs to be positioned further forward and downward compared to this embodiment. Consequently, in Comparative Example 1, compared to this embodiment, the guide member 25 and the guide hole 251 need to be extended in the second direction D2, requiring more space. In Figure 6(a), the extended portion of the guide member 25 in Comparative Example 1 compared to this embodiment is shown by a dashed line.

[0057] Next, Comparative Example 2 will be described, which allows the locking device 233 to be positioned without shifting its position relative to the embodiment. The cover device 60 of Comparative Example 2 differs from that of this embodiment in that it does not have a second roller 28, and the connecting member 29 is connected only to the first roller 27 (not shown in Figure 6(b)).

[0058] In the cover device 60 of Comparative Example 2, the connecting member 29 is connected to the first roller 27, so the key 231 can be positioned in the same location as in this embodiment to avoid the extension of the guide member 25 in the second direction D2. On the other hand, since the cover device 60 is not provided with a second roller 28, the position of the key 231 remains fixed without changing even if the first roller 27 moves.

[0059] In the configuration shown in Comparative Example 2, where the orientation of the key 231 does not change, the key 231 is always positioned above the first roller 27. Consequently, when the first roller 27 is positioned above the upper bent portion 251c or the first hole portion 251a, the key 231 may interfere with the upper part of the device body 10. Therefore, in Comparative Example 2, compared to this embodiment, the guide member 25 and the guide hole 251 need to be extended upward, requiring more space. In Figure 6(b), the extended portion of the guide member 25 in Comparative Example 2 compared to this embodiment is shown by a dashed line.

[0060] As described above, in the configuration of this embodiment, the key 231 is positioned offset from the first roller 27 connected to the tip of the cover 21. Furthermore, in the configuration of this embodiment, since a second roller 28 is provided, the key 231 moves while its posture changes to align with the guide hole 251 as the cover 21 opens and closes. Therefore, in the configuration of this embodiment Therefore, it is possible to prevent the guide member 25 from becoming too large, contributing to space saving.

[0061] <Other examples> The above-described embodiment is merely an example, and this disclosure can be modified as appropriate without departing from its essence. For example, the guide member 25 and the first roller 27 may be provided on both sides of the cover 21, not just one side. In particular, if the cover 21 is large, the operability of opening and closing the cover 21 can be improved by providing guide parts such as guide holes 251 on both sides of the cover 21 to guide the movement of the cover 21. Also, for example, in the locking mechanism 23, the key 231 may be fixed to the device body 10, and the locking device 233 may be connected to the cover 21 so as to move together with the cover 21. [Explanation of Symbols]

[0062] 10...Main body of the device, 20...Cover device, 21...Cover, 211...Upper cover body (first cover part), 213...Front cover body (second cover part), 231...Key, 233...Locking device, 233a...Keyhole, 251...Guide hole (guide part), 27...First roller (first moving body), 28...Second roller (second moving body), 100...Machine tool, L1...First rotation axis, L2...Second rotation axis

Claims

1. A cover that covers an opening in the main body of a machine tool and is openable and closable relative to the opening, comprising: a first cover portion rotatably supported on the main body of the machine tool about a first rotation axis; and a second cover portion rotatably supported on the first cover portion about a second rotation axis parallel to the first rotation axis; A first movable body connected to the second cover portion, the first movable body moves in a direction perpendicular to the first rotation axis direction while being guided by a guide portion of the device body provided adjacent to the cover in the direction of the first rotation axis, A second moving body moves together with the first moving body while being guided by the guide portion, A key that moves together with the first moving body and the second moving body, A keyhole into which the aforementioned key is inserted is formed, and a locking device capable of locking the aforementioned key is provided. A cover device for a machine tool, comprising: The key and the locking device are provided in the first rotation axis direction on the side opposite to the cover with respect to the guide portion, A cover device for a machine tool, characterized in that the orientation of the key is determined by the positions of the first moving body and the second moving body.

2. The guide portion is a guide hole that penetrates in the direction of the first rotation axis and extends in a direction perpendicular to the direction of the first rotation axis, The cover device for a machine tool according to claim 1, characterized in that the first moving body and the second moving body are configured to move within the guide hole in the direction of extension of the guide hole.

3. The cover device for a machine tool according to claim 1, characterized in that the first moving body and the second moving body are rollers having a shaft body extending in the direction of the first rotation axis and a rotating body rotatable about the shaft body.

4. The system further includes a plate-shaped connecting member that connects the shaft of the first moving body and the shaft of the second moving body, The cover device for a machine tool according to claim 3, characterized in that the key is attached to the connecting member and its orientation changes integrally with the connecting member as the first moving body and the second moving body move.

5. The main body of the device, A knife rest and The main shaft, A cover device according to any one of claims 1 to 4, A machine tool equipped with, A machine tool characterized in that the tool post and the spindle are arranged inside a first space formed by the device body and the cover, and the key and the locking device are arranged inside a second space formed to the side of the cover by the device body and the guide portion.

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