JP5041126B2 - Telescopic covers for machine tools - Google Patents

Description

  The present invention relates to a telescopic cover that includes a plurality of cover bodies that can be expanded and contracted by relative movement and covers an upper side of a drive mechanism that drives a movable table provided in a machine tool.

  Conventionally, in a machine tool, a saddle or a table for positioning and placing a workpiece to be cut is driven independently in the X and Y directions, and the workpiece is cut by a cutting tool attached to a spindle head supported by a column. Is to be given. In such a machine tool, for example, as shown in Patent Document 1, the upper side of the drive mechanism is covered with a telescopic cover in order to protect the drive mechanism of the saddle and the table from cutting waste.

  Further, in the telescopic cover described in Patent Document 2, in the first embodiment, the upper side of the ball screw and the guide rail is arranged so that cutting waste does not enter the ball screw and the guide rail of the drive mechanism that reciprocates the table in the X direction. Is always covered with first and second cover assemblies provided on the left and right sides of the table.

  In this case, each of the first and second cover assemblies includes a first cover member and a second cover member, and a first cover member is attached to the lower surface of the table, and a second cover member is attached to the first cover member. The cover members are slidably supported, and a pair of second cover members are connected to each other by two connecting rods at the inner end so that the second cover member does not tilt.

  Further, in the telescopic cover described in Patent Document 2, in the second embodiment, each of the first and second cover assemblies provided in the same manner as in the first embodiment includes the first and second cover members. A first cover member is attached to the lower surface of the table, a second cover member is slidably supported by the first cover member, and the outer side of the pair of first cover members The stop member is attached at a position that enters the inside by a predetermined distance from the outer end.

That is, the first cover member and the second cover member overlap each other by a predetermined distance. Therefore, even when the second cover member protrudes maximally outward from the first cover member, the second cover member is supported by the outer portion of the first cover member by the overlapping portion of a predetermined distance. It is.
JP-A-2005-22042 Japanese Patent Laid-Open No. 8-57741

  In the telescopic cover described in Patent Document 2, in the first embodiment, when the second cover member is moved through the first cover member when the table is moved, the two connected second plates are moved. Since the two cover members are moved simultaneously, there is a problem that the movement load of the second cover member is increased and the drive motor for driving the table is increased in size.

  Further, in the telescopic cover described in Patent Document 2, in the second embodiment, when the second cover member protrudes maximally outward from the first cover member, the overlapping portion of a predetermined length Since the second cover member is supported by the outer portion of the first cover member, the second cover member cannot effectively exhibit the cover function over its entire length, and the second cover member Since the length dimension must be increased according to the dimension of the overlapping portion, there is a problem that the cost of the second cover member is increased.

A telescopic cover for a machine tool according to claim 1, wherein the telescopic cover for a machine tool includes a plurality of cover bodies that overlap with each other so as to be movable relative to each other and can be expanded and contracted by relative movement. In the pair of cover bodies, the outer cover body has a rectangular upper wall portion in a plan view and a pair of side wall portions parallel to the expansion / contraction direction respectively connected to opposite ends of the upper wall portion. A pair of guide members provided on the side wall portions and extending in parallel with the expansion and contraction direction are provided, and the inner cover body is connected to the rectangular upper wall portion and opposite end portions of the upper wall portion in plan view. A pair of guided portions provided with a pair of side wall portions parallel to the extending and contracting direction, provided on the pair of side wall portions of the inner cover body, and slidably engaged with the pair of guide members, respectively . A member, the inner It is provided with a said extendable outward cover side a pair of guided members which respectively have a protrusion from the base end portion protrudes in a cantilever manner to the outer cover side wall portion of the pair of cover bodies.

  A pair of guide members provided on the inner cover body on the pair of guide members provided on both side walls of the outer cover body in the outer cover body and the inner cover body constituting each set of cover bodies, Since a pair of guided members projecting in parallel with the expansion and contraction direction from the outer cover body side base end portion of the side wall portion of the cover body toward the outer cover body are respectively slidably engaged, Through the engagement between the pair of guide members and the pair of guided members, they overlap with each other so that they can move relative to the outer cover body, and expand and contract by relative movement.

  In this case, when the inner cover body overlaps the outer cover body to the maximum extent, the guided member of the inner cover body does not protrude to the opposite side of the outer cover body, that is, outside the machine tool. Further, even when the inner cover body extends from the outer cover body to the maximum extent, the inner cover body is supported by the outer cover body by the engagement between the pair of guide members and the pair of guided members.

A telescopic cover for a machine tool according to a second aspect is the invention according to the first aspect, wherein the guide member is configured to regulate upward and downward movement of the guided member.
A telescopic cover for a machine tool according to a third aspect is the invention according to the first or second aspect, wherein the guide member is made of a synthetic resin member having a transverse concave cross section.

A telescopic cover for a machine tool according to a fourth aspect is the invention according to the third aspect, wherein the guided member is a member having a U-shaped cross section.
A telescopic cover for a machine tool according to a fifth aspect of the present invention is the telescopic cover according to the first or second aspect, wherein the guided member is formed of a synthetic resin member having a laterally concave cross section.

  A telescopic cover for a machine tool according to a sixth aspect is the invention according to the third or fifth aspect, wherein a protective plate is provided on the open side of the guide member or the guided member to prevent foreign matter from entering the cover body. It is a thing.

  A telescopic cover for a machine tool according to a seventh aspect of the present invention is the telescopic cover according to any one of the first to sixth aspects, wherein the guided member has a length that is at least 1/2 of the length of the inner cover body in the expansion / contraction direction. It is.

  A telescopic cover for a machine tool according to an eighth aspect is the invention according to any one of the first to seventh aspects, wherein the telescopic cover is provided symmetrically on both sides of the movable table of the machine tool, and the movable table is in a central neutral position. The protruding length of the guided member to the outer cover body side is set so that the free ends of the opposing guided members of the opposing telescopic covers on both sides of the movable table do not interfere with each other. is there.

  A telescopic cover for a machine tool according to a ninth aspect is the invention according to any one of the first to eighth aspects, wherein the inner cover body side tip vicinity portion of the outer cover body and the outer cover body side proximal end vicinity portion of the inner cover body are disposed inside. A locking mechanism for preventing the cover body from falling off the outer cover body is provided.

  According to a tenth aspect of the present invention, there is provided a telescopic cover for a machine tool according to the ninth aspect, wherein a scraper for removing foreign matter on the surface of the inner cover body is provided at the inner cover body side tip of the outer cover body.

According to the first aspect of the present invention, in the telescopic cover of a machine tool having a plurality of cover bodies that overlap with each other so as to be movable relative to each other and can be expanded and contracted by relative movement, each set of covers adjacent to the inside and outside In the body, the outer cover body has a rectangular upper wall portion in a plan view and a pair of side wall portions parallel to the expansion / contraction direction respectively connected to opposite end portions of the upper wall portion, and the pair of side wall portions. The stretching direction includes a pair of guide members that are provided respectively and extend in parallel with the stretching direction, and the inner cover body is connected to the rectangular upper wall portion and opposite end portions of the upper wall portion in plan view. A pair of guided members provided on the pair of side wall portions of the inner cover body and slidably engaged with the pair of guide members, respectively. A pair of side walls of the inner cover body Since there is provided the expansion and contraction direction outer cover side a pair of guided members protrusions respectively closed from the proximal end portion projecting into the shape having the outer cover side piece, the guide member and a pair of these one-to-inner cover Through the engagement with the guided member, the inner and outer layers overlap with each other so as to be movable relative to the outer cover body, and expand and contract by relative movement.

  Therefore, when the inner cover body overlaps the outer cover body to the maximum extent, the guided member of the inner cover body is opposite to the outer cover body and does not protrude outside the machine tool. The storage property of the guided member can be improved. Further, even when the inner cover body is pulled out from the outer cover body to the maximum extent, the supporting force for supporting the inner cover body can be increased by the engagement between the pair of guide members and the pair of guided members. .

  Therefore, the support structure in which the outer cover body supports the inner cover body can be simplified, and the outer cover body constituting the telescopic cover and the entire inner cover body can be effectively utilized.

  According to the invention of claim 2, since the guide member is configured to restrict the upward and downward movements of the guided member, it is possible to reliably vibrate and shake the inner cover body in the vertical direction relative to the outer cover body. This can prevent the stability of the posture of the inner cover body. Other effects similar to those of the first aspect are obtained.

  According to invention of Claim 3, since the said guide member was comprised by the member made from a synthetic resin of a sideways concave-shaped cross section, the supporting force which supports an inner cover body can be heightened, and the attitude | position of an inner cover body can be improved. Stability can be further enhanced. Other effects similar to those of the first or second aspect are achieved.

According to invention of Claim 4, since the said to-be-guided member was comprised by the member of the U-shaped cross section,
The guided member can be reliably engaged with the guide member, and the stability of the posture of the inner cover body can be further enhanced. Other effects similar to those of the third aspect are achieved.

  According to the invention of claim 5, since the guided member is composed of a synthetic resin member having a laterally concave cross section, the frictional resistance between the guiding member and the guided member can be reduced, and the inner cover The body can slide smoothly. Other effects similar to those of the first or second aspect are achieved.

  According to the sixth aspect of the present invention, since the protective plate that prevents foreign matter from entering the cover body is provided on the open side of the guide member or the guided member, cutting dust or the like is formed inside the cover body. It is possible to prevent foreign matter from entering. Other effects similar to those of the third or fifth aspect are achieved.

  According to the invention of claim 7, since the guided member has a length that is at least 1/2 of the length of the inner cover body in the expansion / contraction direction, the inner cover body is pulled out from the outer cover body to the maximum extent. Even in this case, since the engagement length with which the guided member engages with the guide member is long enough to support the inner cover body, the supporting force for supporting the inner cover body and the posture retention of the inner cover body Can be increased. Other effects similar to those of any one of claims 1 to 6 can be achieved.

  According to the invention of claim 8, telescopic covers are symmetrically provided on both sides of the movable table of the machine tool, and when the movable table is in a neutral position in the middle, the opposing telescopic covers on both sides of the movable table are opposed to each other. Since the protruding length of the guided member toward the outer cover body side is set so that the free ends of each pair of guided members do not interfere with each other, even if the movable table moves from the center to either the left or right direction, Interference between the free ends of each pair of guided members of the opposing telescopic covers on both sides of the movable table can be reliably prevented. Other effects similar to those of any one of claims 1 to 7 can be achieved.

  According to the invention of claim 9, the locking mechanism for preventing the inner cover body from falling off from the outer cover body at the inner cover body side distal end vicinity portion of the outer cover body and the outer cover body side proximal end vicinity portion of the inner cover body. Thus, even when the inner cover body is pulled out from the outer cover body during the movement of the movable table, the inner cover body can be reliably prevented from falling off from the outer cover body. Other effects similar to those of any one of claims 1 to 8 can be achieved.

  According to the invention of claim 10, since the scraper for removing the foreign matter on the surface of the inner cover body is provided at the inner cover body side tip of the outer cover body, the inner cover body moves to the outer side as the movable table moves. When housed inside the cover body, the scraper provided on the outer cover body can surely remove foreign matters such as cutting dust adhering to the surface of the inner cover body. Other effects similar to those of the ninth aspect are achieved.

  The telescopic cover for a machine tool according to the present invention is a telescopic cover for a machine tool that includes a plurality of cover bodies that overlap each other so as to be movable relative to each other and can be expanded and contracted by relative movement. In the cover body, a pair of guide members are provided on both side wall portions of the outer cover body, and a pair of guided members that engage with the pair of guide members are provided from the outer cover body base end of the inner cover body. The outer cover body is provided so as to extend in a cantilevered manner.

  A machine tool 1 that is a general vertical machining center will be described. As shown in FIG. 1, a column 3 is erected on the rear side of the pedestal base body 2, and a Y-direction drive mechanism 5 that moves the movable table 22 in the Y direction on the front side of the column 3 of the pedestal base body 1. An X-direction drive mechanism 6 that moves the movable table 22 in the X direction perpendicular to the Y direction is provided.

  First, the Y-direction drive mechanism 5 that moves the intermediate table 11 on which the movable table 22 is placed in the Y direction will be described.

  As shown in FIG. 1, a pair of left and right Y-direction guide rails 10 extending in the front-rear direction are provided on the pedestal base body 2, and an intermediate table 11 extending in the left-right direction on these Y-direction guide rails 10 is provided in the Y direction. It is placed so that it can move. A Y-direction drive motor 12 is fixed to the rear side of the pedestal base body 2, and a rear end portion of a Y-direction ball screw shaft 13 disposed in the front-rear direction is connected to the drive shaft 12 a via a coupling 14. ing.

  A ball screw nut (not shown) is fixed to the lower side of the intermediate table 11, and the ball screw nut is externally fitted to the Y direction ball screw shaft 13. Therefore, when the Y-direction drive motor 12 is rotationally driven, the intermediate table 11 is moved forward or backward while being guided by the Y-direction guide rail 10 through the ball screw nut by the rotation of the Y-direction ball screw 13.

  In addition, although illustration is abbreviate | omitted, the spindle head is supported by the column 3 provided in the base base body 2 so that a vertical movement is possible. However, the machine tool 1 is provided with a tool changer that selectively switches a plurality of tools to be mounted on the spindle head as necessary, but the illustration is omitted and the detailed description thereof is omitted.

Next, the X direction drive mechanism 6 that moves the movable table 22 in the X direction will be described.
As shown in FIGS. 1 and 4 to 6, the X-direction ball screw shaft 16 disposed in the left-right direction immediately above the intermediate table 11 is supported by bearing members 17 and 18 having bearings at both left and right ends. Each is rotatably supported. An X-direction drive motor 19 is fixed on the right end portion of the intermediate table 11, and the drive shaft and the right end portion of the X-direction ball screw shaft 16 are connected by a coupling 20.

  A pair of front and rear X-direction guide rails 21 extending in the left-right direction is provided on the intermediate table 11, and a movable table 22 that is long in the left-right direction is supported on the X-direction guide rail 21 so as to be movable in the X-direction. A ball screw nut 23 is fixed to the lower side of the movable table 22, and the ball screw nut 23 is externally fitted to the X direction ball screw shaft 16.

  Therefore, when the X-direction drive motor 19 is rotationally driven, the movable table 22 is guided to the X-direction guide rail 21 via the ball screw nut 23 by the rotation of the X-direction ball screw shaft 16, and left or right. The workpiece (not shown) moved and fixed on the movable table 22 is cut by the spindle head.

  Next, a pair of left and right telescopic covers 25A and 25B connected to the movable table 22 will be described. That is, a left telescopic cover 25A that covers the left side of the upper movable table 22 of the X-direction drive mechanism 6 and a right telescopic cover 25B that covers the right side of the upper movable table 22 of the X-direction drive mechanism 6 are provided.

  Since the pair of left and right telescopic covers 25A and 25B are configured symmetrically with respect to the movable table 22 and have the same structure, the left telescopic cover 25A provided on the left side of the movable table 22 will be described. However, the right telescopic cover 25B is assigned the same reference numeral as the left telescopic cover 25A, and the description thereof is omitted.

  As shown in FIGS. 2 to 4 and 7, the left telescopic cover 25A has an outer cover body 26A and an inner cover body 27A, and these two cover bodies 26A and 27A overlap with each other so that they can move relative to each other. It is combined so that it can expand and contract in the X direction by movement.

  First, the outer cover body 26A will be described. As shown in FIGS. 7 to 12, the outer cover body 26A has an upper wall portion 26a, a rear side wall portion 26c, a front side wall portion 26d, and a right side wall plate 26b, and a lower side and a left end portion thereof are opened. The cross section is formed in a gate shape and is made of a metal plate. A connecting plate 28A facing in the front-rear direction is fixed to a central portion in the left-right direction on the upper surface of the upper wall portion 26a, and the left end of the movable table 22 is fixed to the connecting plate 28A with a bolt (not shown). Therefore, the outer cover body 26 </ b> A is movable in the left-right direction integrally with the movable table 22.

  A hard rubber scraper 29A is attached to the left end portion of the upper wall portion 26a and the left end portions of both side wall portions 26c and 26d over the entire width thereof. As shown in FIGS. 10 to 12, a pair of substantially L-shaped guide plates 30 </ b> A that are in contact with the pair of front and rear X-direction guide rails 21 are fixed to the right side wall plate 26 b. Since the pair of guide plates 30A are slidably in contact with the upper surface and the inner surface of the corresponding X-direction guide rail 21, the right end portion of the outer cover body 26A is supported by the X-direction guide rail 21. The rattling in the front-rear direction is prevented.

  As shown in FIGS. 11 and 12, the outer cover body 26A is further provided at the lower ends of the side wall portions 26c and 26d, below the horizontal portions 26e and 26f that are horizontally bent inward. On the side, a guide member 31A having a length extending over the entire length of the outer cover body 26A and formed in a laterally concave cross section is integrally fixed in the X direction. However, each of the pair of left and right guide members 31A is made of a hard and low friction synthetic resin. In the outer cover body 26A, a rubber packing (not shown) having a substantially gate-shaped cross section is attached to the inner surfaces of the upper wall portion 26a, the side wall portion 26c, and the side wall portion 26d.

  Next, the inner cover body 27A will be described. As shown in FIGS. 7 to 9, 13, and 14, the inner cover body 27A includes an upper wall portion 27a, a rear side wall portion 27c, a front side wall portion 27d, and a left side wall plate 27e. Are formed in a substantially gate-shaped cross-section and are each made of a metal plate. As shown in FIG. 14, a substantially L-shaped guide plate 33A that contacts the pair of front and rear X-direction guide rails 21 is fixed to the right side wall plate 27b. Since the pair of guide plates 33A are slidably in contact with the upper surface and the inner surface of the corresponding X-direction guide rail 21, the right end portion of the inner cover body 27A is supported by the X-direction guide rail 21. The rattling in the front-rear direction is prevented.

  As shown in FIGS. 8, 9, and 13-14, in the inner cover body 27A, a pair of metals is provided on the inner surfaces of the lower end portions of the side wall portions 27c, 27d over almost the entire length in the left-right direction. Each of the guided members 34A is fixed, and the right side portion of the pair of guided members 34A is cantilevered by a predetermined length parallel to the X direction toward the outer cover body 26A (ie, to the right). It is comprised so that it may protrude.

  The guided member 34A includes an attachment portion 34d, an upper plate portion 34c, a vertical plate portion 34b, and a horizontal support portion 34a, and a U-shaped cross section is formed by the upper plate portion 34c, the vertical plate portion 34b, and the horizontal support portion 34a. ing. Upper plate portions 34c are joined to the upper surfaces of horizontal portions 27f and 27g formed by bending the lower end portions of both side wall portions 27c and 27d horizontally inward, and the inner surfaces of the lower end portions of both side wall portions 27c and 27d. 34 d of attachment parts are joined, respectively, and the to-be-guided member 34A is being fixed to the both side wall parts 27c and 27d of 27 A of inner side cover bodies, respectively. The horizontal support portion 34a is formed from the outer cover body 26A side base end portion (right base end portion) of the both side wall portions 27c and 27d to the right end portion, and the outer cover body 26A side base of the both side wall portions 27c and 27d. It is not formed from the end to the left end.

  As shown in FIG. 7 to FIG. 9 and FIG. 18, when the inner cover body 27A is combined with the outer cover body 26A, the horizontal support portions 34a of the guided members 34A are respectively fitted into the engaging recesses 31a of the guide members 31A. The upper portions of the guide member 31A are fitted between the upper plate portion 34c and the horizontal support portion 34a of the guided member 34A, respectively. Therefore, the guide member 31A regulates the upward movement, the downward movement, and the movement in the front-rear direction of the guided member 34A. That is, the vibration and shaking of the inner cover body 27A with respect to the outer cover body 26A in the vertical direction and the front-rear direction are prevented.

  When the inner cover body 27A is combined with the outer cover body 26A, the gap between the side wall portion 26c of the outer cover body 26A and the side wall portion 27c of the inner cover body 27A, the side wall portion 26d of the outer cover body 26A, and the inner cover body The gap between the side wall portions 27d of 27A is configured to be filled with the rubber packing described above.

  Next, the outer cover body 26A is provided in the vicinity of the inner cover body 27A side distal end portion and the outer cover body 26A side proximal end vicinity portion of the inner cover body 27A to prevent the inner cover body 27A from falling off the outer cover body 26A. The left side locking mechanism 36A will be described.

  As shown in FIGS. 7, 8, and 15, the above-described hard rubber scraper 29A is provided at the left end of the upper wall portion 26a of the outer cover body 26A. A hard cushion rubber 37A is fixed to the inner surface of the right side wall plate 27b of the inner cover body 27A with screws 38A. However, the upper end portion of the cushion rubber 37A protrudes above the upper wall portion 27a of the inner cover body 27A.

  Therefore, as shown in FIG. 8, even when the inner cover body 27A is largely pulled out to the left from the outer cover body 26A, the scraper 29A of the outer cover body 26A and the cushion rubber 37A of the inner cover body 27A are securely connected. Therefore, the inner cover body 27A does not come off from the outer cover body 26A, that is, does not fall off.

  Here, on the upper part of the outer surface of the right side wall plate part 27b, a pair of front and rear synthetic resin support plates 39A made of a plate member and coming into contact with the upper wall part 26a of the outer cover body 26A from the lower side are provided, respectively. It is fixed to the right side wall plate 27b by 40A. Therefore, even when the inner cover body 27A moves relative to the outer cover body 26A in the expansion / contraction direction, the support plate 39A can smoothly move the inner cover body 27A.

  As shown in FIG. 15, a cushion material 41A such as rubber is fixed to the right side wall plate 27b of the inner cover body 27A. Therefore, as shown in FIGS. 4 and 7, even when most of the inner cover body 27A enters and overlaps the inner side of the outer cover body 26A, the right side wall plate 27b of the inner cover body 27A and the right side wall of the outer cover body 26A. The collision with the plate 26b is mitigated.

  By the way, as shown in FIGS. 4 and 6, the horizontal wall 43a of the left bracket 43A bent in an L shape is screwed to the left end of the X-direction guide rail 21, and the vertical wall 43b of the left bracket 43A. A pair of left-side stoppers 44A are fixed to the upper end of each. Therefore, as shown in FIG. 4, the vertical wall 43b of the left bracket 43A is positioned on the right side of the left wall plate 27e of the inner cover body 27A.

  Therefore, as shown in FIG. 4, when the inner cover body 27A moves to the right, the left stopper 44A comes into contact with the left wall plate 27e of the inner cover body 27A from the right side, and the right limit position of the inner cover body 27A is Be regulated. Conversely, as shown in FIG. 16, when the inner cover body 27A moves to the left, the cushion material 42A attached to the right side wall plate 27b is left on the vertical wall 45A (the back side of 43b) of the left side bracket 43A. The left limit position of the inner cover body 27A is regulated.

  Here, as shown in FIG. 17, for the left telescopic cover 25A, the inner cover body 27A overlaps the outer cover body 26A to the maximum extent (when stored), and the right telescopic cover 25B has the inner cover. Even when the body 27B overlaps the outer cover body 26B to the maximum extent (when it is housed), the guided ends are prevented so that the free ends of the guided members 34A, 34B provided on the outer cover bodies 26A, 26B do not interfere with each other. The protrusion amount (length) of the members 34A and 34B toward the outer cover bodies 26A and 26B is set. In this case, the guided members 34A and 34B are set to a length equal to or more than ½ of the X-direction length (stretching direction length) of the inner cover bodies 27A and 27B.

  Next, the operation of the left telescopic cover 25A of the machine tool 1 configured as described above will be described.

  When the X direction drive motor 19 is rotated, the movable table 22 is moved to the left or right along the X direction guide rail 21 via the X direction ball screw shaft 16. When the movable table 22 moves to the vicinity of the right limit position, in the initial stage, as shown in FIG. 7, when the inner cover body 27A is not pulled out from the outer cover body 26A to the maximum extent, When the body 27A does not move due to contact resistance with the X-direction guide rail 21, only the outer cover body 26A moves to the right in synchronization with the movable table 22 (see FIG. 16).

  Alternatively, when the contact resistance between the scraper 29A and the inner cover body 27A is larger than the contact resistance with the guide rail 21, the outer cover body 26A and the inner cover body 27A move almost simultaneously, and the left side wall of the inner cover body 27A. The plate 27e comes into contact with the left stopper 44A fixed to the vertical wall 43b of the left bracket 43A, and the movement of the inner cover body 27A is restricted, and then only the outer cover body 26A moves.

  Thereafter, as a result of only the outer cover body 26A moving with the inner cover body 27A left behind, the scraper 29A of the outer cover body 26A and the cushion rubber 37A of the inner cover body 27A come into contact with each other by the left side locking mechanism 36A. The inner cover body 27A is pulled by the outer cover body 26A and moves to the right in synchronization with the outer cover body 26A.

  Thereafter, when the inner cover body 27A moves to the vicinity of the right limit position, the inner cover body 27A moves to the right while being pulled out from the outer cover body 26A to the maximum, and the left stopper 44A is moved to the inner cover body 27A. To the left side wall plate 27e from the right side, the right limit movement position of the inner cover body 27A is regulated (see FIG. 4).

  In this way, even when the inner cover body 27A is pulled out to the maximum from the outer cover body 26A, the guided member 34A of the inner cover body 27A has a predetermined length on the pair of guide members 31A provided on the outer cover body 26A. Since they are engaged with each other, the inner cover body 27A can be reliably supported by the outer cover body 26A.

  On the other hand, when the movable table 22 moves to the vicinity of the left limit position, in the initial stage, when the inner cover body 27A does not move due to contact resistance with the X-direction guide rail 21, only the outer cover body 26A is movable table. Synchronize with 22 and move to the left (see FIG. 4).

  Alternatively, when the contact resistance between the scraper 29A and the inner cover body 27A is larger than the contact resistance with the guide rail 21, the outer cover body 26A and the inner cover body 27A move almost simultaneously, and the cushion material for the right wall plate 27b. 42A comes into contact with the vertical wall portion 45A of the left bracket 43A, the movement of the inner cover body 27A is restricted, and then only the outer cover body 26A moves. At this time, the scraper 29A provided on the outer cover body 26A moves while removing cutting chips and the like placed on the upper surface of the upper wall portion 26a of the inner cover body 27A.

  As a result of the movement of only the outer cover body 26A with the inner cover body 27A left behind, the left locking mechanism 36A causes the cushion material 41A to contact the right wall plate 26b of the outer cover body 26A from the left side. The inner cover body 27A moves to the left in synchronization with the outer cover body 26A (see FIG. 4). Thereafter, the outer cover body 26A and the inner cover body 27A move integrally to the left in synchronism until the movable table 22 moves to the vicinity of the left limit position.

As described above, in the left telescopic cover 25A of the machine tool 1 including the plurality of cover bodies 26A and 27A that are overlapped so as to be movable relative to each other and can be expanded and contracted by the relative movement, the outer cover body adjacent to the inside and outside. 26A and the inner cover body 27A, a pair of guide members 31A extending in parallel with the expansion / contraction direction is provided on both side wall portions 26c and 26d of the outer cover body 26A, and the lower ends of the both side wall portions 27c and 27d in the inner cover body 27A. A pair of metal guided members 34A is fixed to the inner surface of each of the portions over almost the entire length in the left-right direction, and the right side portion of the pair of guided members 34A is directed toward the outer cover body 26A. the expansion and contraction direction parallel to a pair of guided members 34A which slidably respectively engaged with the guide member 31A of the pair projecting in a cantilever manner is provided to the Therefore, the inner cover body 27A can be overlapped inside and outside so as to be movable relative to the outer cover body 26A through the engagement of the pair of guide members 31A and the pair of guided members 34A. Expansion and contraction is possible by relative movement.

  The guide member 31A is made of a synthetic resin member having a laterally concave cross section, and the guided member 34A is made of a metal member having a U-shaped cross section. A gap between the side wall part 26c and the side wall part 27c of the inner cover body 27A and a gap between the side wall part 26d of the outer cover body 26A and the side wall part 27d of the inner cover body 27A are narrowed. Therefore, the rubber packing for filling the gap between the side wall part 26c of the outer cover body 26A and the side wall part 27c of the inner cover body 27A and the gap between the side wall part 26d of the outer cover body 26A and the side wall part 27d of the inner cover body 27A. The thickness can be reduced, and the inner cover body 27A can be slid smoothly.

  Therefore, when the inner cover body 27A overlaps the outer cover body 26A to the maximum extent, the guided member 34A of the inner cover body 27A is opposite to the outer cover body 26A and protrudes outside the machine tool 1. There is nothing, and the stowability of the guided member 34A can be improved. Further, even when the inner cover body 27A is pulled out from the outer cover body 26A to the maximum extent, the supporting force that supports the inner cover body 27A by the engagement between the pair of guide members 31A and the pair of guided members 34A. Can be increased.

  Therefore, the support structure in which the outer cover body 26A supports the inner cover body 27A can be simplified, and the outer cover body 26A and the inner cover body 27A constituting the left telescopic cover 25A can be effectively used. be able to.

  Further, since the guide member 31A is configured to restrict the upward movement, the downward movement, and the movement in the front-rear direction of the guided member 34A, it is possible to reliably prevent the inner cover body 27A from vertically vibrating and shaking with respect to the outer cover body 26A. And the stability of the holding posture of the inner cover body 27A can be improved.

  Further, since the guide member 31A is composed of a synthetic resin member having a laterally concave cross section, the supporting force for supporting the inner cover body 27A can be enhanced, and the stability of the posture of the inner cover body 27A is further enhanced. be able to. Since the guided member 34A is formed of a member having a U-shaped cross section, the guided member 34A can be reliably engaged with the guide member 31A, and the stability of the posture of the inner cover body 27A can be further enhanced. .

  Further, since the guided member 34A has at least a length of ½ or more of the length of the inner cover body 27A in the expansion / contraction direction, even when the inner cover body 27A is pulled out from the outer cover body 26A to the maximum extent, Since the engagement length at which the guide member 34A engages with the guide member 31A is long enough to support the inner cover body 27A, the supporting force for supporting the inner cover body 27A and the attitude of the inner cover body 27A are maintained. Can increase the sex.

  Further, a left telescopic cover 25A and a right telescopic cover 25B are provided symmetrically on both sides of the movable table 22 of the machine tool 1, and when the movable table 22 is in the central neutral position, the relative positions on both sides of the movable table 22 are relatively small. The protruding length of the guided member 34A toward the outer cover body 26A is set so that the free ends of the opposed pairs of guided members 34A and 34B facing the telescopic covers 25A and 25B facing each other do not interfere with each other. Even when the movable table 22 moves in any direction from the center to the left or right, it is possible to reliably prevent interference between the free ends of each pair of guided members 34A facing each other on the opposite telescopic covers on both sides of the movable table 22. be able to.

  Further, the left side latch that prevents the inner cover body 27A from falling off the outer cover body 26A at the inner cover body 27A side tip vicinity and the outer cover body 26A side base end vicinity of the outer cover body 26A. Since the mechanism 36A is provided, even when the inner cover body 27A is pulled out from the outer cover body 26A to the maximum when the movable table 22 is moved, the inner cover body 27A is surely removed from the outer cover body 26A by the locking mechanism. Can be prevented.

  Furthermore, since a scraper 29A for removing so-called foreign matters such as cutting dust on the surface of the inner cover body 27A is provided at the tip of the outer cover body 26A on the inner cover body 27A side, When the cover body 27A is housed inside the outer cover body 26A, the scraper 29A provided on the outer cover body 26A can reliably remove foreign matters such as cutting dust attached to the surface of the inner cover body 27A. .

Next, a modified form of the embodiment will be described.
1) The height of the engaging recess 31a of the guide member 31A having a U-shaped cross section provided on the outer cover body 26A is increased, and the both ends of the horizontal support portion 34a of the guided member 34A are engaged with each other in the longitudinal direction. A roller member that contacts the recess 31a may be pivotally attached. In this case, the sliding resistance of the inner cover body 27A with respect to the outer cover body 26A can be eliminated, and the movement of the inner cover body 27A can be facilitated.

2] As shown in FIG. 19, in the left telescopic cover 25A, when the inner cover body 27A is pulled out from the outer cover body 26A to the maximum extent, the left end portion of the horizontal support portion of the guided member 34A is the outer cover body 26A. The length of the horizontal support portion may be shortened so as not to protrude from the guide member 31A. However, the same members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In this case, even when the intermediate table 22 moves to the right during cutting and the inner cover body 27A is pulled out to the maximum extent from the outer cover body 26A, the left end portion of the horizontal support portion of the guided member 34A is outside. Since it does not protrude from the guide member 31A of the cover body 26A, it is possible to reliably prevent the cutting waste due to the cutting of the workpiece from adhering to the upper side of the horizontal support portion of the guided member 34A. Therefore, the contraction movement of the inner cover body 27A with respect to the outer cover body 26A is smoothed. The right telescopic cover 25B has the same configuration as that of the left telescopic cover 25A.

3] As shown in FIG. 20, the left telescopic cover 25C may be a three-stage type constituted by three first to third cover bodies 46A to 48A. However, the same members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In this case, as shown in FIGS. 20 and 21, the first cover body 46A (this corresponds to the outer cover body 26A) and the second cover body 47A (this corresponds to the inner cover body 27A) adjacent to each other are formed. In a set of cover bodies, a pair of guide members 31A is provided on the first cover body 46A, and a pair of guided members 34A is provided on the second cover body 47A, as described in the embodiment. A pair of guided members 34A is slidably engaged with the pair of guide members 31A.

  Further, in a set of cover bodies composed of a second cover body 47A (which corresponds to the outer cover body 26A) and a third cover body 48A (which corresponds to the inner cover body 27A) adjacent to the inside and outside, it will be described in the embodiment. Similarly, a pair of guide members 31A is provided on the second cover body 47A, and a pair of guided members 34A is provided on the third cover body 48A. A pair of guide members 31A is provided on the pair of guide members 31A. The guided member 34A is slidably engaged.

  Since the left telescopic cover 25C is configured as described above, the left telescopic cover 25C includes a first cover body 46A and a second cover body 47A that are adjacent to each other inside and outside, and a second cover body 47A that is adjacent to the inside and outside. In the one set of cover bodies composed of the third cover body 48A, the same operational effects as in the above-described embodiment are exhibited. The right telescopic cover has the same configuration as that of the left telescopic cover 25C.

4) In the above embodiment, the guide member 31A is composed of a synthetic resin member having a laterally concave cross section, and the guided member 34A is composed of a metal member having a U-shaped cross section. The front end portion of the horizontal portions 27e and 27f provided at the lower ends of the side wall portions 26c and 26d of the outer cover body 26A without the guide member 31A is provided, without being provided with the guide member 31A. The inner cover body 27A may be combined with the outer cover body 26A by engaging with the engaging recess 34b of the member 34C. However, the same members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 22, in the side wall portion 27d of the inner cover body 27A, a guided member 34C having a laterally concave cross section is fixed to the lower side of the horizontal portion 27g. When the inner cover body 27A is combined with the outer cover body 26A, the engaging recess 34b of the guided member 34C has a horizontal portion 26f (this corresponds to a guide member) provided at the lower end of the side wall portion 26d of the outer cover body 26A. It is comprised so that a front-end | tip part may engage.

  On the lower surface of the horizontal portion 26f on the open side of the guided member 34C, protective plates 50 formed to have substantially the same length as the left and right lengths of the horizontal portion 26f are fixed in a standing manner. In this case, since the structure of the guide member is simplified, the manufacturing cost of the telescopic cover is reduced. Further, since the guided member 34C is composed of a synthetic resin member having a laterally concave cross section, it is possible to reduce the frictional resistance between the horizontal portion 26f, which is a guiding member, and the guided member 34C. 27A can be smoothly slid. Further, since the protective plate 50 is provided on the lower surface of the horizontal portion 27f, it is possible to prevent foreign matters such as cutting dust from entering the gap between the engaging recess 34b of the guided member 34C and the horizontal portion 27f. The right telescopic cover has the same configuration as that of the left telescopic cover.

5] In the above embodiment, the inner cover body 27A is engaged with the outer cover by engaging the front end portion of the horizontal portion 27h provided at the lower ends of the both side walls 27c and 27d of the inner cover body 27A with the engagement recess 31a of the guide member 31A. You may combine with the body 26A. However, the same members as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 23, at the lower end of the side wall portion 26d of the outer cover body 26A, a horizontal portion 26g is formed by bending the lower end portion of the side wall portion 26d outwardly horizontally, and below the horizontal portion 26g. A guided member 31A having a laterally concave cross section is fixed to the side. At the lower end of the side wall portion 27d of the inner cover body 27A, a horizontal portion 27h (this corresponds to a guided member) is formed by bending the lower end portion of the side wall portion 27d horizontally outward, and the inner cover body 27A. Is combined with the outer cover body 26A, the front end portion of the horizontal portion 27h is engaged with the engaging recess 31a of the guide member 31A. In this case, since the structure of the guided member is simplified, the manufacturing cost of the telescopic cover is reduced. In this case as well, a protective plate may be provided on the lower surface of the horizontal portion 27h in an upright direction. The right telescopic cover has the same configuration as that of the left telescopic cover.

6] The telescopic cover of the present invention may be applied to a telescopic cover that covers the upper side of the Y-direction drive mechanism 5.
7) The guided member is configured in various lengths as long as it is configured to protrude in parallel with the expansion / contraction direction from the outer cover body side base end portion of the side wall portion of the inner cover body toward the outer cover body. It is possible.
8] The present invention is not limited to the embodiments described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes those modifications.

It is a schematic perspective view of the machine mechanism which concerns on the Example of this invention. It is a top view of a movable table and a telescopic cover. It is a front view of an intermediate table, a movable table, and a telescopic cover. It is the DD sectional view taken on the line of FIG. It is the EE line vertical front view of FIG. It is the elements on larger scale of an intermediate table and an X direction drive mechanism. It is a principal part longitudinal front view of the contraction state of an outer side cover body and an inner side cover body. It is a principal part vertical front view of the expansion | extension state of an outer side cover body and an inner side cover body. It is a perspective view of the left telescopic cover in the extended state. It is a top view of an outer side cover body. It is H arrow line view of FIG. It is the II sectional view vertical side view of FIG. It is a top view of an inner side cover body. It is a NN line vertical side view of FIG. FIG. 8 is a partially enlarged front view of FIG. 7. It is a front view of an intermediate table, a movable table, and a telescopic cover. It is a front view of an intermediate table, a movable table, and a telescopic cover. It is the RR line vertical side view of FIG. FIG. 10 is a diagram corresponding to FIG. 9 according to a modified embodiment. FIG. 10 is a diagram corresponding to FIG. 9 according to a modified embodiment. It is a principal part vertical side view of FIG. It is an expanded vertical side view of the principal part of the guide member which concerns on a change form, and a to-be-guided member. It is an expanded vertical side view of the principal part of the guide member which concerns on a change form, and a to-be-guided member.

DESCRIPTION OF SYMBOLS 1 Machine tool 22 Movable table 25A Left telescopic cover 25B Right telescopic cover 26A Outer cover body 26f Horizontal part (guide member)
27A Inner cover body 27h Horizontal portion (guided member)
29A Scraper 31A Guide member 31B Guide member 34A Guided member 34B Guided member 34C Guided member 36A Left side locking mechanism 44A Left stopper 46A First cover body 47A Second cover body 48A Third cover body 50 Protection plate

Claims (10)

In a telescopic cover of a machine tool comprising a plurality of cover bodies that overlap with each other so as to be movable relative to each other and can be expanded and contracted by relative movement,
In each set of cover bodies adjacent inside and outside,
An outer cover body is provided on each of the pair of side walls and the pair of side walls parallel to the expansion / contraction direction, which are respectively connected to the rectangular upper wall and the opposite ends of the upper wall in plan view. A pair of guide members extending parallel to the expansion and contraction direction ;
The inner cover body is provided with a pair of side wall portions parallel to the expansion and contraction direction respectively connected to the rectangular upper wall portion and opposite end portions of the upper wall portion in plan view,
A pair of guided members respectively provided on a pair of side wall portions of the inner cover body and slidably engaged with the pair of guide members, the pair of side walls of the inner cover body A telescopic cover for a machine tool, comprising a pair of guided members each having a protruding portion protruding in a cantilevered manner from the base end portion on the outer cover body side in the expansion / contraction direction to the outer cover body side .   The telescopic cover for a machine tool according to claim 1, wherein the guide member is configured to restrict upward movement and downward movement of the guided member.   3. The telescopic cover for a machine tool according to claim 1, wherein the guide member is made of a synthetic resin member having a laterally concave cross section. 4.   The telescopic cover for a machine tool according to claim 3, wherein the guided member is a member having a U-shaped cross section.   The telescopic cover for a machine tool according to claim 1, wherein the guided member is made of a synthetic resin member having a horizontally concave cross section.   6. The telescopic cover for a machine tool according to claim 3, wherein a protective plate for preventing foreign matter from entering the inside of the cover body is provided on the open side of the guide member or the guided member.   The telescopic cover for a machine tool according to any one of claims 1 to 6, wherein the guided member has a length that is at least ½ or more of the length of the inner cover body in the expansion / contraction direction.   When the telescopic covers are provided symmetrically on both sides of the movable table of the machine tool and the movable table is in a neutral position in the center, each pair of guided members of the opposite telescopic covers on both sides of the movable table is opposed to each other. The telescopic cover for a machine tool according to any one of claims 1 to 7, wherein a protruding length of the guided member toward the outer cover body is set so that the free ends do not interfere with each other.   A locking mechanism for preventing the inner cover body from falling off from the outer cover body is provided at the inner cover body-side tip vicinity of the outer cover body and the outer cover body-side proximal end section of the inner cover body. Item 10. A telescopic cover for a machine tool according to any one of Items 1 to 8.   10. The telescopic cover for a machine tool according to claim 9, wherein a scraper for removing foreign matter on a surface of the inner cover body is provided at a front end portion of the outer cover body on the inner cover body side.

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