JP2020049619A - Door mechanism of machine tool - Google Patents

Abstract

To provide a door mechanism of a machine tool having higher safety than hitherto.SOLUTION: In a door mechanism of a machine tool, the upper end of a folding door 30 having a horizontal bendable shaft J2 is supported rotatably, and the lower end is supported slidably in a vertical direction. Further, the folding door 30 is folded in two and opened by lifting operation to a lower part of the folding door 30. The door mechanism of the machine tool includes a latch mechanism 60 for latching so that the folding door 30 is not moved downward in the middle of the lifting operation, and a latch release operation part 76 for performing latch release operation.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a door mechanism of a machine tool.

  In many door mechanisms of machine tools, the door slides horizontally and horizontally. On the other hand, the upper end of the folding door having a horizontal folding axis is rotatably supported, while the lower end is slidably supported in the vertical direction. A device that opens a door has been developed (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 2018-8354 (FIGS. 1 and 2)

  By the way, the above-described door mechanism in which the folding door is folded upward has an advantage that a work space when the door is opened is wider than that in which the door slides sideways. On the other hand, in order to spread this door mechanism, it is necessary to improve safety.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an upper end portion of a folding door having a horizontal folding axis is rotatably supported, while a lower end portion is slidable vertically or obliquely vertically. The door mechanism of the machine tool, which is supported by the main body and covers the front surface of the machine tool main body and raises the lower part of the folding door to open the folding door by folding the folding door in two, A machine tool comprising: a latch mechanism for latching a door so as not to move downward; and a latch release operation unit provided for releasing the latch and at least partially exposed at a lower portion of the outer surface of the folding door. It is a door mechanism.

  The invention according to claim 2 has a balancer for urging the folding door in the opening direction, and the folding door can be freely opened by the urging force of the balancer and the frictional resistance of the movable portion of the folding door. The door mechanism for a machine tool according to claim 1, wherein the door mechanism is held at a position.

  The invention according to claim 3 is the door mechanism for a machine tool according to claim 1 or 2, wherein the latch mechanism latches the folding door at a plurality of open positions.

  According to a fourth aspect of the present invention, in the latch mechanism, one or more fixed-side latch portions fixed to the machine tool main body, and a latch position attached to the folding door, with respect to the fixed-side latch portion. The movable latch portion is moved between an unlatched position and is biased to the latch position, and is provided on the fixed latch portion and the movable latch portion. A sliding contact portion that slides on each other when passing through the fixed latch portion and moves the movable latch portion at the latch position to the unlatched position, wherein the latch release operation portion and the movable latch portion are provided. And an intermediate connection mechanism for connecting the movable latch portion to the latch release operation portion and connecting the latch release operation portion so as not to be driven by the movable latch portion. Is a machine tool of the door mechanism according to any one of claims claim 1 to 3.

  According to a fifth aspect of the present invention, the intermediate connection mechanism is formed by connecting the latch release operation portion and the movable latch portion with a string-shaped, wire-shaped, or chain-shaped intermediate connection member. 4. The door mechanism of a machine tool according to item 1.

  According to a sixth aspect of the present invention, both ends of the intermediate connecting member are fixed at two positions where the distance between the two ends changes with opening and closing of the folding door, and the intermediate connecting member absorbs the change in the distance. 6. The door mechanism for a machine tool according to claim 5, wherein a slack is provided.

  The invention according to claim 7 is the door mechanism for a machine tool according to any one of claims 1 to 6, wherein the latch mechanism and the latch release operation section are provided in pairs.

  The invention according to claim 8, wherein the latch release operation section moves between a latch release position for releasing the latch and an origin position allowing the latch and is urged to the origin position, and the folding door is And is moved between a lock position that restricts the movement of the latch release operation portion to the latch release position and an unlock position that allows the latch release operation portion, and is biased to the lock position, and The door mechanism of a machine tool according to any one of claims 1 to 6, further comprising an unlocking operation section whose section is exposed at a lower portion of the outer surface of the folding door.

  In the door mechanism of the machine tool according to the first aspect, the folding door is latched so as not to move downward during the operation of opening the folding door. Unless the latch release operation is performed by the latch release operation unit, the folding door does not fall from the latched open position, so that safety is improved.

  In the door mechanism of the machine tool according to the second aspect, the balancer that urges the folding door in the opening direction facilitates the opening operation of the folding door and prevents the lower portion of the folding door from dropping sharply.

  In the door mechanism of the machine tool according to the third aspect, since the folding door is latched at a plurality of open positions, the degree of freedom of the opening degree of the folding door is increased.

  In the door mechanism for a machine tool according to claims 4 and 5, the movable latch portion is driven by the latch release operation portion, and the latch release operation portion is not driven by the movable latch portion. During the operation of the side latch section moving over the fixed side latch section, the latch release operation section is maintained in the stopped state. Thus, the folding door can be smoothly opened with the hand on or near the latch release operation section.

  By providing a slack in the intermediate connecting member as in the configuration of claim 6, the distance between the latch release operating portion and the connecting portion with the intermediate connecting member in the movable latch portion can be adjusted to open and close the folding door. It can be arranged at a position that changes with this, and the degree of freedom of arrangement increases.

  In the door mechanism for a machine tool according to the seventh aspect, it is necessary to operate the pair of unlatching operation units with both hands to release the latch, and the safety of both hands is ensured.

  In the door mechanism for a machine tool according to the eighth aspect, the release of the latch requires the operation of the lock release operation unit and the latch release operation unit with both hands, and the safety of both hands is ensured.

FIG. 2 is a perspective view of the forming machine according to the first embodiment in a state where a folding door is closed. Perspective view of the forming machine with the folding door open Perspective view of door device Side view of the door device with the folding door closed Side view of the door device with the folding door open Rear view of door device Flat cross section of door device Rear view of a part of the door device enlarged Rear view of a part of the door device enlarged The perspective view which expanded a part of latch mechanism provided in the door device. The perspective view of the door device of a 2nd embodiment. Rear view in which a part of the lower part of the folding door of the third embodiment is enlarged. Rear view in which a part of the lower part of the folding door of the fourth embodiment is enlarged. Rear view of the door device of the fifth embodiment Rear view in which the lower part of the folding door of the sixth embodiment is enlarged. Rear view of an enlarged part of the lower part of the folding door Rear view of an enlarged part of the lower part of the folding door

[First Embodiment]
Hereinafter, an embodiment of the door mechanism of the machine tool shown in FIGS. 1 to 10 will be described. 1 and 2 show an entire forming machine 10 as an example of a machine tool. The forming machine 10 has a rectangular parallelepiped pedestal 11 and a plurality of linear driving units 13 arranged radially on a front surface of a support wall 12 rising from a rear portion of an upper surface thereof. In the following description, in the case where the right and left are distinguished from each other, the right toward the front surface of the support wall 12 is simply referred to as “right”, and the opposite is simply referred to as “left”.

  As shown in FIG. 2, the central part of the plurality of linear driving units 13 forms a processing stage 14, and a supply path 15 extends rightward from the processing stage 14, and a discharge path 16 extends diagonally below and to the left. A tool 13T is fixed to an end of each linear drive unit 13 on the processing stage 14 side. Then, the blank material is fed to the processing stage 14 through the supply path 15, formed into a work of a predetermined shape by the plurality of tools 13 </ b> T, and discharged to the discharge path 16.

  In front of the support wall 12 and above the pedestal 11, a door device 20 having a “machine tool door mechanism” of the present invention is attached. As shown in FIG. 3, the door device 20 includes a support frame 21, a pair of side fixing covers 26, and a folding door 30. The support frame 21 is fixed to the pedestal portion 11 and the support wall 12, and is a part of a main body 10H of the forming machine 10 (corresponding to a "machine tool main body" in the claims).

  The support frame 21 is fixed to a state (see FIG. 1) along the upper front edge of the front wall of the support wall 12, and the first horizontal bar 22 is moved forward in parallel and slightly lowered. The second horizontal bar 23 disposed at the position, the plurality of connecting beams 24 communicating between the first and second horizontal bars 22, 23, and the second horizontal bar 23 erected from both front corners of the upper surface of the base 11. 2 has a pair of columns 25 for supporting both ends of the horizontal bar 23. Further, the first and second horizontal bars 22, 23 and the pair of columns 25 have a rectangular cross section, and one side surface of the first and second horizontal bars 22, 23 is parallel to each other in the front-rear direction. Opposite to each other, one side surface of the pair of columns 25 is parallel to each other and is laterally opposed.

  The pair of side fixing covers 26 are formed by obliquely cutting the upper part of a long rectangular flat plate in the vertical direction, and oppose each other with the support frame 21 interposed therebetween in the horizontal direction. A fixing piece 26L, which is bent inward at right angles from the rear edge and the lower edge of the side fixing cover 26, is fixed on the front surface of the support wall 12 and the upper surface of the pedestal portion 11, and is fixed. A plurality of fixing pieces 26K (see FIG. 6) projecting from a plurality of positions in the vertical direction of the inner surface are fixed on the front or rear surfaces of the pair of columns 25 in an overlapping manner.

  As shown in FIG. 4, the upper side portion of the side fixing cover 26 includes an inclined portion 27A inclined forward and downward from the rear end to a position closer to the front end, and a horizontal portion 27B extending horizontally from the position closer to the front end to the front end. Become. The left side fixed cover 26 has an opening 26B through which the above-described discharge passage 16 penetrates. As shown in FIG. 3, the right side fixed cover 26 penetrates the above-described supply passage 15. An opening 26A is formed.

  As shown in FIG. 3, the folding door 30 includes an upper door section 31 and a lower door section 40 that are hingedly connected. Hereinafter, unless otherwise specified, the structure of the upper door portion 31 and the lower door portion 40 will be described assuming that the folding door 30 is disposed at the closed position illustrated in FIG.

  The folding door 30 has a housing structure in which the rear surface and the lower surface are open. The top plate portion 32 of the upper door portion 31 has a horizontal flat plate shape, and its planar shape is a horizontally long rectangle. The front plate portion 35 of the upper door portion 31 has a horizontally long rectangle when viewed from the front, and has an L-shaped flat portion 36 that is flush with the entire upper edge portion and the entire left edge portion, An inner portion of the L-shaped flat portion 36 is slightly depressed rearward. The depressed portion includes an inclined portion 37D inclined backward from both sides of the L-shaped flat portion 36, and a rectangular flat portion 37 inside the L-shaped flat portion 36 and parallel to the L-shaped flat portion 36. The portion of the rectangular flat portion 37 other than the upper edge portion and both side edge portions is a window portion 37W formed of a light transmitting member.

  The pair of side plate portions 33 of the upper door portion 31 are disposed directly above the pair of side fixing covers 26, and the shapes of the left and right side plate portions 33 are slightly different corresponding to the shape of the front plate portion 35. . Specifically, as shown in FIG. 4, the left side plate portion 33 has a rectangular lower portion extending in the vertical direction with the same uniform width as the top plate portion 32 in a shape corresponding to the upper side portion of the side fixing cover 26. It has a cut structure. On the other hand, as shown in FIG. 3, the right side plate portion 33 has a front edge portion cut in a stepped shape corresponding to the shape of the front plate portion 35, and a lower side portion corresponds to an upper side portion of the side fixing cover 26. It is cut into a shape.

  The entire inclined portion 34A of the pair of side plate portions 33 overlaps the entire inclined portion 27A of the pair of side fixing covers 26. Further, the entire horizontal portion 34B of the right side plate portion 33 overlaps the entire horizontal portion 27B of the side fixing cover 26. As shown in FIG. 4, the horizontal portion 34B of the left side plate portion 33 has a rear portion. It overlaps the entire horizontal portion 27B on the upper side of the left side fixing cover 26. The front edge of the left side plate 33 protrudes forward from the side fixing cover 26.

  The upper door portion 31 has a rear edge portion of the top plate portion 32 hinged to the first horizontal bar 22 described above. Specifically, as shown in FIG. 3, the plurality of hinges 90 move their rotation center axes J1 along a ridge line at a corner where the front surface and the upper surface of the first horizontal bar 22 intersect. Are located. One of the pivot plates of the hinges 90 is fixed on the front surface of the first horizontal bar 22, while the other is fixed on the rear edge of the lower surface of the top plate 32. Thus, the upper door portion 31 is supported by the first horizontal bar 22 so as to rotate about the rotation center axis J1.

  Like the front plate 35 of the upper door portion 31, the lower door portion 40 forms a horizontally long rectangle when viewed from the front, and includes an L-shaped flat portion 41 that is continuous along the entire lower edge portion and the entire left edge portion. And a slanted portion 42D, a rectangular flat portion 42, and a window 42W inside. The lower door 40 is hinged to the lower end of the upper door 31 so as to rotate about a bending axis J2 parallel to the rotation center axis J1 of the upper door 31. The bending axis J2 extends so as to pass through the intersections of the inclined portion 34A and the horizontal portion 34B at the lower sides of the left and right side plate portions 33 in common. When the folding door 30 is disposed at the closed position, the upper side of the lower door 40 and the lower side of the front plate 35 abut against each other, and the front surface of the upper door 31 and the front surface of the lower door 40 are in contact with each other. It is arranged flush.

  When the folding door 30 is disposed at the closing position, the left side of the rectangular flat portion 42 of the lower door portion 40 overlaps the front edge of the side fixing cover 26, and the L-shaped flat portion 41 of the lower door portion 40 Both sides are separated from the both side fixing covers 26 with a gap forward. Both side portions of the L-shaped flat portion 41 are bent rearward at a right angle so as to close the gap, thereby forming a rear protruding wall 43. The lower part of the rear protruding wall 43 is inclined with respect to the vertical direction to avoid interference with the side fixing cover 26 when the folding door 30 is opened.

  A handle portion 44 is attached to the front surface of the L-shaped flat portion 41 of the lower door portion 40. The handle portion 44 is, for example, a rectangular pipe connected in an L-shape along the L-shaped flat portion 41, and has a plurality of support protrusions 44A on a rear surface. Then, the plurality of support protrusions 44 </ b> A abut against the front surface of the L-shaped flat portion 41 and are fixed in a state where each side of the handle portion 44 is arranged at the center in the width direction of each side of the L-shaped flat portion 41. I have.

  As shown in FIG. 6, the lower end of the lower door portion 40 is supported by the pair of columns 25 so as to be able to move directly. For this purpose, a vertically extending slide rail 50 is fixed to the opposing surfaces of the pair of columns 25, and a slider 51 is slidably engaged with the slide rail 50. As shown in FIG. 7, each slide rail 50 is disposed at a rearward position on the opposing surfaces of the pair of columns 25, and each slider 51 has a planar shape L formed by orthogonally intersecting a pair of flat plates. A shaped first bracket 52 is fixed. Further, a second bracket 53 is fixed at a position near both ends in the lateral direction on the lower rear surface of the lower door portion 40 and protrudes rearward. Then, the second brackets 53 are respectively overlapped and rotatably connected to the first plate portions 52A located between the pair of columns 25 of the left and right first brackets 52. Thereby, the lower end of the lower door part 40 is supported so as to be able to move linearly in the vertical direction, and when the lower part of the lower door part 40 is raised, as shown in FIG. 5, the folding door 30 is folded and opened. . When the folding door 30 is opened to the fully open position shown in FIG. 2, the inclined portion 34A of the side plate portion 33 of the upper door portion 31 overlaps the rear surface of the lower door portion 40.

  As shown in FIG. 6, a balancer 54 is attached to the rear upper portion of the pair of columns 25. As shown in FIG. 8, the balancer 54 includes a metal belt 56 wound around a bobbin 55, and the distal end of the metal belt 56 overlaps a second plate portion 52 </ b> B of the first bracket 52 located behind the column 25. Is fixed. The bobbin 55 is urged in a direction in which the metal belt 56 is wound by an elastic member (not shown) provided therein. That is, the lower end of the lower door portion 40 is urged upward by the pair of balancers 54. The folding door 30 is held at an arbitrary open position by the urging force of the balancer 54 and the frictional resistance of the movable portion of the folding door 30.

  As shown in FIG. 6, a latch mechanism 60 is provided between the right support 25 and the slider 51. The latch mechanism 60 has an engaging member 57 fixed to the support column 25 and extending in the vertical direction, and a rod unit 61 fixed to the slider 51 and moving in the vertical direction. Specifically, as shown in FIG. 10, the engaging member 57 is fixed to the front of the slide rail 50 on the surface of the support 25 to which the slide rail 50 is fixed, and as shown in FIG. 25 extends from the lower end position to the upper end portion. As shown in FIG. 9, a plurality of fixed-side latch portions 58 are provided vertically at equal intervals on the surface of the engagement member 57 opposite to the surface fixed to the column 25. Each fixed-side latch portion 58 has a triangular projection structure when viewed from the front-rear direction, and has an upward and horizontal locking surface 58A and a sliding contact surface 58B facing obliquely downward.

  On the other hand, as shown in FIG. 10, the rod unit 61 includes a cylinder portion 63 that is disposed above a portion of the first bracket 52 fixed to the slider 51 and connected to the second bracket 53 and extends in the horizontal direction. Have. The cylinder portion 63 has a vertically long rectangular cross section, and one end surface 63B of the cylinder portion 63 faces the engaging member 57 when the slider 51 is raised.

  As shown in FIG. 9, a linear motion rod 64 having a non-circular cross section is supported inside the cylinder portion 63 so as to be linearly movable and non-rotatable. A portion of the linear motion rod 64 fitted into the cylinder portion 63 is provided with a flange 64F. Further, a compression coil spring 65 is accommodated between the flange 64F and the inner end surface of the cylinder portion 63 on the side away from the engagement member 57. Then, the linear motion rod 64 is biased to a latch position where the flange 64F abuts on the inner end surface of the cylinder portion 63 on the side near the engagement member 57.

  One end of the linear motion rod 64 disposed at the latch position protrudes from one end face 63B of the cylinder portion 63, and the protruding portion forms a movable latch portion 66. The other end of the linear motion rod 64 always protrudes from the other end surface 63A of the cylinder portion 63, and the tip of the protruding portion is a wire fixing portion 64G for fixing a wire 74 described later.

  The movable latch 66 has a trapezoidal shape when viewed from the front-rear direction, and has a downward and horizontal locking surface 66B and a sliding contact surface 66A that faces obliquely upward. The sliding contact surface 66A of the movable latch portion 66 and the sliding contact surface 58B of the fixed latch portion 58 are parallel to each other. When the rod unit 61 moves upward together with the lower part of the lower door part 40, the sliding contact between the sliding contact surfaces 58B and 66A causes the movable latch part 66 to move to the unlatched position and sequentially climb over the fixed latch part 58. To go. Further, the movable side latch portion 66 returns to the latch position each time the movable side latch portion 66 gets over the fixed side latch portion 58, and latches so as not to move the lower door portion 40 downward. In this way, the folding door 30 is latched by the latch mechanism 60 at a plurality of open positions.

  The release of the latch by the latch mechanism 60 is performed by operating the latch release operation unit 70 attached to the lower part of the lower door unit 40. As shown in FIG. 9, the latch release operation section 70 has a rail 71 extending in the lateral direction. The rail portion 71 is slidably supported by a pair of slide support portions 72 fixedly arranged side by side at the lower rear portion of the lower door portion 40. A horizontally elongated slot 75 is formed in a portion of the lower door portion 40 sandwiched between the pair of slide support portions 72. The long hole 75 is disposed immediately behind the horizontally long portion of the handle 44. Then, the operation projection 76 of the latch release operation section 70 projecting forward from the rail section 71 projects forward of the lower door section 40 through the elongated hole 75, and abuts against the rear surface of the handle section 44 (see FIG. 7). .

  The movable range of the latch release operation section 70 is regulated by the contact between the wire attachment member 73 and one slide support section 72 described below, and the contact between the slide support section 72 and a stopper (not shown). As shown in FIG. 9, the latch release operation section 70 is urged by the elastic member 78 toward the side approaching the engagement member 57, and is usually arranged at the origin position, which is one end side of the movable range. . Then, by pushing the operation projection 76 to the side away from the engagement member 57 (that is, the center side of the lower door section 40) with the hand attached to the handle section 44, the latch release operation section 70 is moved to the other end of the movable range. Move to the side, unlatched position.

  One end of the rail portion 71 is disposed apart from the wire fixing portion 64 </ b> G of the direct-acting rod 64 in the lateral center of the lower door portion 40. A wire attachment member 73 is fixed to one end of the rail portion 71. As shown in FIG. 10, the wire attachment member 73 extends upward from the rail portion 71, and has an upper end portion serving as a wire fixing portion 73G. The wire fixing portion 73 </ b> G of the wire attachment member 73 is located slightly below the extension of the linear motion rod 64. The wire fixing portion 73G of the wire mounting member 73 and the wire fixing portion 64G of the linear motion rod 64 are connected by a wire 74.

  Since a part of the linear motion rod 64 is a movable latch portion 66, the latch release operation portion 70 is connected to the movable latch portion 66 by a wire 74 via a member other than the movable latch portion 66. This wire 74 corresponds to an “intermediate connecting member” in the claims. Further, the movable side latch portion 66 and the latch release operation portion 70 may be connected to one or a plurality of other components interlocked with one or each of them via a wire 74.

  The linear rod 64 and the wire fixing portions 64G, 73G of the wire attachment member 73 are separated upward from the rotation center axis J3 of the lower end of the lower door portion 40. For this reason, as shown in FIG. 5, when the folding door 30 is opened and the lower door portion 40 is tilted forward, the wire fixing portion 73G of the wire attaching member 73 and the wire fixing portion 64G of the linear motion rod 64 mutually move. Separate. Therefore, at the closed position of the folding door 30, the wire 74 is attached so as to be loose between the two wire fixing portions 64G and 73G. Further, the slack of the wire 74 is exactly eliminated at the fully opened position of the folding door 30. This prevents the linear motion rod 64 from being pulled toward the latch release position by opening and closing the folding door 30. Further, even at an arbitrary open position of the folding door 30, the slack of the wire 74 can be eliminated by moving the latch release operation section 70 to an intermediate position between the origin position and the latch release position. Then, when the latch release operation portion 70 is moved to the latch release position at an arbitrary open position including the fully open position, the linear motion rod 64 moves to the unlatched position via the wire 74, and the latch by the latch mechanism 60 is released. . Further, even when the linear motion rod 64 moves over the fixed side latch portion 58 and moves to the unlatched position in a state where the latch release operation portion 70 is located at the origin position, the wire 74 bends, and the latch release operation portion 70 is held at the origin position. That is, in the door mechanism of the present embodiment, the linear motion rod 64 is driven by the latch release operation unit 70, and the latch release operation unit 70 is not driven by the linear motion rod 64.

  This concludes the description of the configuration of the door mechanism of the present embodiment. Next, the operation and effect of this door mechanism will be described. In order to open the folding door 30 at the closed position shown in FIG. Then, in the process of the raising operation, the movable latch portion 66 sequentially climbs over the plurality of fixed latch portions 58, and the folding door 30 is latched at an arbitrary open position where the raising operation is stopped. Here, since the movable latch section 66 and the latch release operation section 70 are connected by the wire 74, the operation of moving over the movable latch section 66 is absorbed by the slack of the wire 74, and the latch release operation section 70 is in the stopped state. Is maintained. Thus, the folding door 30 can be smoothly opened with the hand on the latch release operation section 70 or in the vicinity thereof. Further, since the folding door 30 is urged in the opening direction by the balancer 54, the opening operation of the folding door 30 can be easily performed.

  Furthermore, since the wire 74 is slackened at the closed position of the folding door 30, the distance between the movable latch 66 and the latch release operating unit 70 changes with the opening operation of the folding door 30. However, the change can be absorbed by the slack of the wire 74. In other words, the movable latch portion 66 and the latch release operation portion 70 can be arranged at positions where the distance between them changes when the folding door 30 is opened and closed, and the degree of freedom in their arrangement and shape is increased. Thus, the manufacturing cost can be reduced.

  When the foldable door 30 is opened to a desired open position, the foldable door 30 is latched by the latch mechanism 60 as described above, and does not fall from the open position unless the latch release operation unit 70 performs a latch release operation. Secured. The latch release operation may be performed, for example, by placing a hand on the handle portion 44 from above and pushing the operation protrusion 76 of the latch release operation section 70 with the hand to move to the latch release position. Then, the latch by the latch mechanism 60 is released, the lower part of the folding door 30 descends, and the folding door 30 is closed. At this time, the urging force of the balancer 54 prevents the lower part of the folding door 30 from dropping sharply. In addition, the urging force of the balancer 54 is large enough to hold the folding door 30 at an arbitrary open position by being combined with the frictional resistance of the movable portion of the folding door 30, so that the closing operation of the folding door 30 is performed. It does not hinder.

  Note that even if the number of the plurality of fixed-side latch portions 58 is reduced and scattered, the folding door 30 can be moved to any position between the fixed-side latch portions 58 only by the urging force of the balancer 54 and the frictional resistance. It may be stationary. In this case, even if the metal belt 56 of the balancer 54 breaks, it is possible to prevent the lower portion of the folding door 30 from dropping at the open position where the fixed latch portion 58 and the movable latch portion 66 are locked.

[Second embodiment]
FIG. 11 shows a part of the door device 20A of the present embodiment. The door device 20A includes a pair of the latch mechanism 60 and the latch release operation portion 70 of the door device 20 of the first embodiment in a symmetrical manner, as shown in FIG. , A pair of operation projections 76 is arranged. That is, although not shown, the plane section of the door device 20A has a structure in which the right portion of FIG. 7 is copied symmetrically. According to this configuration, it is necessary to operate the pair of unlatching operation sections 70 with both hands to release the latch, and the safety of both hands is ensured.

[Third embodiment]
FIG. 12 shows a part of the door device 20B of the present embodiment. The door device 20B has a structure in which a lock release operation section 91 and a lock member 96 are added to the lower portion of the rear surface of the folding door 30 of the first embodiment. The lock release operation section 91 is disposed on an extension of the rail section 71 of the latch release operation section 70 and extends in the horizontal direction. The lock release operation section 91 is slidably supported in a horizontal direction by a pair of slide support sections 72 so that the lock position and the lock position are unlocked. Move between the unlocked position. Further, the lock release operation section 91 is urged by the elastic member 93 to the lock position side away from the latch release operation section 70. Further, an operation projection 95 projects forward from the lock release operation section 91 and is exposed to the front side of the folding door 30 through the elongated hole 94.

  The lock member 96 is disposed between the latch release operation unit 70 and the lock release operation unit 91, and rotates around a rotation axis J4 facing in the front-rear direction. The lock member 96 is held at a lock position at one end of the rotatable range by the elastic member 97 and the stopper 98, and one end of the lock member 96 is abutted against the latch release operation unit 70 at the origin position, and the latch release operation unit 70 is regulated. When the lock release operation unit 91 is moved to the unlock position, the wedge portion 91S at the tip of the lock release operation unit 91 slides on the other end of the lock member 96, and the lock member 96 rotates to release the latch. Retreat from the moving range of the operation unit 70. Thereby, the operation of the latch release operation unit 70 becomes possible.

  According to the configuration of the present embodiment as well, to release the latch, it is necessary to operate the lock release operation unit 91 and the latch release operation unit 70 with both hands, and the safety of both hands is ensured.

[Fourth embodiment]
FIG. 13 shows a door device 20C of the present embodiment. The door device 20C of the present embodiment includes a pair of unlatching operation units 80 arranged in a point-symmetric manner at the lower portion of the rear surface of the folding door 30 of the first embodiment, and interlocks with the unlatching operation units 80. It has a rotating member 85. Specifically, the rotation member 85 rotates around a rotation shaft oriented in the front-rear direction, and is provided so as to be integrally rotatable with the involute gear 86, the latch gear 87, and the bobbin 88. A wire 74 is wound around the bobbin 88, and the distal end thereof is connected to the linear motion rod 64 described in the first embodiment.

  The pair of unlatching operation parts 80 have rail parts 89 extending in the horizontal direction, are respectively slidably supported in the horizontal direction, and are urged by elastic members 78 in a direction away from each other. The involute gear 86 is vertically sandwiched by the pair of rails 89, and the latch gear 87 is horizontally sandwiched by a pair of arms 81 bent at right angles from the distal ends of the pair of rails 89. ing. The locking claws 82 provided on the pair of arm portions 81 lock the teeth of the latch gear 87 to restrict the rotation of the rotating member 85. In addition, a rack gear 83 is provided at a base end of each of the latch release operation sections 80 away from the arm section 81. When the operating projections 76 of both latch release operating sections 80 are operated with both hands so as to approach each other, the locking between the locking claw 82 and the teeth of the latch gear 87 is released, and the rotating member 85 becomes rotatable. When the two latch release operating portions 80 are moved closer to each other, the rack gear 83 meshes with the involute gear 86, the rotating member 85 rotates clockwise, and the wire 74 is wound around the bobbin 88, and is directly moved. The moving rod 64 moves from the latched position to the unlatched position.

  Also according to the configuration of the present embodiment, it is necessary to operate the pair of unlatching operation sections 80 with both hands to release the latch, and the safety of both hands is ensured.

[Fifth Embodiment]
As shown in FIG. 14, in the latch mechanism 60V of the door device 20D of the present embodiment, the rod units 61 described in the first embodiment are vertically arranged in pairs and fixed to the first bracket 52. In addition, the latch release operation units 70 described in the first embodiment are provided side by side in pairs corresponding to the rod units 61. Then, the movable side latch portions 66 of the linear motion rods 64 supported by the pair of rod units 61 at arbitrary open positions of the folding door 30 are locked to the fixed side latch portions 58, respectively. Is latched. Thereby, when closing the folding door 30, it is necessary to operate the pair of latch release operation sections 70 with both hands, and the safety of both hands is ensured.

[Sixth embodiment]
The door device 20E of the present embodiment is a modification of the fifth embodiment. That is, in the door device 20D of the fifth embodiment shown in FIG. 14, the pair of linear motion rods 64 having the movable side latch portion 66 and the pair of latch release operation portions 70 are both linearly moved. However, in the door device 20E of the present embodiment shown in FIGS. 15 to 17, both the portions corresponding to the pair of linear motion rods 64 and the pair of latch release operation units 70 of the fifth embodiment are turned. It is configured to work.

  Specifically, as shown in FIG. 16, in the door device 20E of the present embodiment, the engaging member 57 described in the first embodiment is fixed to a column 25 that is opposite to the left and right in the fifth embodiment. A lever support member 64W is attached to the first bracket 52 of the slider 51 that moves along the column 25. A pair of latch levers 64V are vertically arranged on the lever support member 64W, and the positions of the latch levers 64V near the lower ends are rotatably supported by support shafts 63J extending in the front-rear direction. The movable latch 66 described in the first embodiment is provided above the surface of each latch lever 64V facing the engagement member 57. Further, the spring 69A presses the position near the upper end of each latch lever 64V from the side opposite to the engaging member 57, and the stopper bolt 69B is addressed to the lower end of each latch lever 64V from the side opposite to the engaging member 57. I have. As a result, the latch lever 64V pivots between a latch position in which the latch lever 64V abuts against the stopper bolt 69B to be in the upright posture and an unlatched position in which the latch lever 64V is separated from the engaging member 57 and becomes inclined. Is held in.

  In order to operate these latch levers 64V, a pair of unlatching operations of a lever structure are provided at the lower part of the folding door 30 instead of the pair of unlatching operation parts 70 of the fifth embodiment shown in FIG. The part 70V is attached. The latch release operation portion 70V on the side closer to the engagement member 57 and the lower latch lever 64V are connected by a wire 74, and the latch release operation portion 70V on the far side from the engagement member 57 and the upper latch lever 64V And are connected by a wire 74.

  Specifically, below a pair of long holes 75 provided in the folding door 30, a latch release operation unit is fixed to a base block 68 and is supported by the base block 68 and extends in the front-rear direction. A lower end of 70V is rotatably supported on a shaft. Then, both ends of the wire 74 are fixed to the position near the upper end of the latch release operation portion 70V and the upper end portion of the latch lever 64V, and the operation protrusion projects outward from the rear end of the latch release operation portion 70V via the elongated hole 75. 76 protrudes. Further, the support bolt 67A rises from the upper surface of the base block 68, and the latch release operation part 70V is engaged with the engaging member by a coil spring inserted between the upper end part of the support bolt 67A and the latch release operation part 70V. It is urged so as to fall to the 57 side, abuts against the stopper bolt 67B, and is positioned at the origin position.

  According to the configuration of the present embodiment, the same operation and effect as those of the fifth embodiment can be obtained. It should be noted that a structure that is rotatably supported like the latch release operation portion 70V of the present embodiment and that operates directly, such as the linear motion rod 64 of the fifth embodiment, may be used, It is also possible to adopt a configuration in which a linearly movable unit such as the latch release operation unit 70 of the fifth embodiment and a rotatable unit such as the latch lever 64V of the present embodiment are operated.

[Other embodiments]
(1) In the folding door 30 of the embodiment, the upper door portion 31 has a housing structure. However, the folding door has a “horizontal bending axis, and the upper end portion is rotatably supported. On the other hand, the lower end portion is supported so as to be slidable in the vertical direction or the diagonal vertical direction to cover the front surface of the machine tool main body.

(2) If the lower end of the folding door is supported so as to be slidable in the up-down direction or the diagonal up-down direction, for example, the folding shown in FIG. Like the door 30, the upper door portion of the folding door may be horizontal at the closed position.

(3) In the above-described embodiment, a plurality of fixed-side latch portions 58 are provided. However, for example, a structure in which only one fixed-side latch portion 58 that latches the folding door 30 at the fully open position is provided. Good.

10 Forming machine (machine tool)
10H main body (machine tool main body)
21 Support frame (machine tool body)
Reference Signs List 30 Folding door 50 Slide rail 51 Slider 54 Balancer 58 Fixed latch part 58B, 66B Sliding contact surface (sliding contact part)
60, 60V Latch mechanism 64 Direct acting rod 65 Compression coil spring 66 Movable latch 70, 80 Latch release operation 74 Wire (intermediate connecting member)
91 Lock release operation part J2 Bending axis

Claims (8)

An upper end of a folding door having a horizontal folding axis is rotatably supported, while a lower end is slidably supported in a vertical direction or an oblique vertical direction to cover a front surface of a machine tool main body, and the folding door is provided. In the door mechanism of the machine tool, the folding door is folded and opened by the raising operation on the lower part of the door.
A latch mechanism for latching the folding door so as not to move downward during the raising operation;
A door release mechanism for a machine tool, comprising: a latch release operation unit provided for releasing the latch and at least a part of which is exposed at a lower portion of an outer surface of the folding door. A balancer for biasing the folding door in an opening direction,
The door mechanism of a machine tool according to claim 1, wherein the folding door is held at an arbitrary open position by an urging force of the balancer and a frictional resistance of a movable portion of the folding door.   The door mechanism of a machine tool according to claim 1, wherein the latch mechanism latches the folding door at a plurality of open positions. In the latch mechanism,
One or more fixed-side latch portions fixed to the machine tool body,
A movable latch portion attached to the folding door and moving between a latch position and an unlatched position with respect to the fixed latch portion and biased to the latch position;
The movable-side latch portion is provided on the fixed-side latch portion and the movable-side latch portion, and slides with each other when the movable-side latch portion rises and passes through the fixed-side latch portion. A sliding contact portion that moves to an unlatched position,
A connection is made between the latch release operation section and the movable latch section so that the movable latch section is driven by the latch release operation section and the latch release operation section is not driven by the movable latch section. The door mechanism of a machine tool according to any one of claims 1 to 3, further comprising an intermediate coupling mechanism.   The door of the machine tool according to claim 4, wherein the intermediate release mechanism is formed by connecting the latch release operation unit and the movable-side latch unit with a string-shaped, wire-shaped, or chain-shaped intermediate connection member. mechanism.   Both ends of the intermediate connecting member are fixed at two positions where the distance between them changes with the opening and closing of the folding door, and the intermediate connecting member is provided with slack to absorb the change in the distance. A door mechanism for a machine tool according to claim 5.   The door mechanism of a machine tool according to any one of claims 1 to 6, wherein the latch mechanism and the latch release operation unit are provided in pairs. The latch release operation unit is moved between a latch release position for releasing the latch and an origin position allowing the latch, and is urged to the origin position,
Attached to the folding door, it moves between a lock position that regulates the movement of the latch release operation portion to the latch release position and an unlock position that allows it, and is biased to the lock position. The door mechanism of a machine tool according to any one of claims 1 to 6, further comprising: a lock release operation unit that is at least partially exposed at a lower portion of an outer surface of the folding door.