JP2010058234A - Expansion cover apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an expanding and contracting stroke from being shortened by not allowing an angle made between a pair of end part link bars located in an end part in an expanding direction to become 180° or more, and to improve durability in an expansion cover apparatus in which each coating plate is connected to be flexible by a pantograph-type link mechanism made of a plurality of link bars with a plurality of coating plates stacked. <P>SOLUTION: Stopper parts 67p, 67p, 77p, 77p abutting on the end part link bars 68a, 68a, 78a, 78a and stopping the angle made between a pair of end part link bars 68a, 68a, 78a, 78a from becoming 180° or more are provided on the coating plates 67, 77 located in an end in the direction of board thickness. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an expansion / contraction cover device in which a plurality of cover plates are overlapped and each cover plate is connected and extended by a pantograph-type link mechanism including a plurality of link bars.

  Conventionally, it has been provided with a plurality of cover plates stacked in the plate thickness direction and a pantograph type link mechanism for slidably connecting the cover plates, and the pantograph type link mechanism is provided on each cover plate located at both ends in the plate thickness direction. A pair of intermediate links whose intermediate portions are pivotally supported by each of the cover plates positioned between the pair of end link bars whose ends are swingably supported and both cover plates positioned at both ends in the thickness direction. An expansion / contraction cover device composed of a partial link bar is known (see, for example, Patent Document 1).

In the thing of patent document 1, the expansion-contraction cover apparatus is arrange | positioned in the front surface of a machine unit, and it is comprised so that an expansion-contraction cover apparatus may expand-contract up and down with the movement of the up-down direction of a machine unit.
Japanese Patent Laid-Open No. 2000-42860

  In the conventional expansion / contraction cover device, the angle formed by the pair of end link bars positioned at the end portions in the expansion / contraction direction of the pantograph type link mechanism may be 180 degrees or more during expansion / contraction. In this case, since the expansion / contraction stroke of the expansion / contraction cover device becomes shorter than the initial state, it becomes impossible to cope with the movement stroke of the machine unit or the like, and an excessive load may be applied to the link bar or the like, causing damage.

  In view of the above points, the present invention prevents the angle formed by the pair of end link bars located at the end portions in the expansion / contraction direction from being 180 degrees or more and prevents the expansion / contraction stroke from being shortened. An object of the present invention is to provide an excellent telescopic cover device.

  In order to achieve the above object, the present invention includes a plurality of cover plates that are stacked in the plate thickness direction, and a pantograph link mechanism that slidably connects the cover plates. The intermediate part swings between each pair of cover plates positioned between the pair of end link bars whose ends are pivotally supported by the respective cover plates positioned at both ends in the direction and both the cover plates positioned at both ends in the plate thickness direction. In a telescopic cover device comprising a pair of intermediate link bars that are freely pivotally supported, and corresponding end portions of each link bar are swingably connected to each other, a covering plate positioned at the end in the plate thickness direction In addition, a stopper portion is provided which is in contact with the end link bar and prevents the angle formed by the pair of end link bars from being 180 degrees or more.

  According to such a configuration, the angle formed by the pair of end link bars whose ends are pivotally supported by the cover plate positioned at the end in the plate thickness direction by the stopper portion is 180 degrees or more, so that the expansion / contraction stroke is from the initial state. Without being shortened, it is possible to prevent damage caused by excessive load applied to the link bar or the like, and to improve durability.

  As shown in FIG. 1, the telescopic cover device 1 according to the embodiment of the present invention is attached to the front surface of a unit support 3 that supports a work unit 2 that can be moved up and down.

  The unit support 3 is disposed on the rear side of the upper surface of the base 4 and can be moved forward and backward on the base 4 by a ball screw 41 rotated by a motor 41a. In addition, a mounting table 42 on which the workpiece W is mounted is provided in the front portion of the base 4. The workpiece W is fixed on the mounting table 42 by a workpiece fixing mechanism (not shown).

  A ball screw 31 that is rotatable by a motor (not shown) and extends in the vertical direction is disposed in the unit support 3. The machine unit 2 can be moved up and down by the rotation of the ball screw 31. A front cover 21 having a through-hole 21a is provided in the front part of the work unit 2, and a processing unit 22 that projects forward from the through-hole 21a of the front cover 21 and processes the workpiece W placed on the mounting table 42 is provided. It has been.

  As shown in FIG. 2, the telescopic cover device 1 includes a pair of left and right guide rails 5, 5 extending in the vertical direction, an upper telescopic cover 6 disposed above the guide rails 5, 5, and guide rails 5, 5. It is comprised with the lower expansion-contraction cover 7 arrange | positioned below between.

  As shown in FIG. 3, the guide rail 5 includes a side wall 51, a front wall 52 that is bent inward from the front end edge of the side wall 51, and a bent plate 53 that is bent inward from the rear end edge of the side wall 51. A bent plate 54 that bends backward from the left and right inner edges of the bent plate 53, a prismatic body 55 that is provided on the inner surface in the left and right direction of the bent plate 54, and the inner surface of the side wall 51. And a projecting piece 56 projecting in the up-down direction at the middle part in the front-rear direction.

  As shown in FIG. 4, the upper telescopic cover 6 includes seven covering members 61 to 67 and two pantograph link mechanisms 68 and 68 that connect the covering members 61 to 67.

  The uppermost covering member 61 is fixed to the upper ends of the guide rails 5 and 5, and as shown in FIG. 5, the rectangular covering plate 61a and the left and right edges of the covering plate 61a are rearward. And side plates 61b and 61b that bend to the right. A guide piece 61c extending downward is provided at the lower end edge of the side plate 61b. The front end edge of the guide piece 61c and the front left and right end portions of the cover plate 61a are in contact with the rear surfaces of the front wall portions 52 of the guide rails 5 and 5.

  A flange 61d that bends outward in the left-right direction is provided at the rear end edge of the side plate 61b and the guide piece 61c. The outer edge in the left-right direction of the flange 61 d is in contact with the inner surface of the side wall 51 of the guide rails 5, 5. A bent piece 61e extending obliquely toward the outer side in the left-right direction is provided at the front end of the lower end of the guide piece 61c, and the rear end edge of the bent piece 61e is provided on the inner surface of the side wall 51 of the guide rail 5. It contacts the front surface 56a of the projected piece 56.

  The covering member 61 includes an upper plate 61f welded to the upper end edge of the covering plate 61a and the upper end edges of the side plates 61b and 61b. A pair of pin fixing pieces 61g that bend downward with a space in the left-right direction are provided at the middle portion of the rear edge of the upper plate 61f. The pin fixing pieces 61g, 61g are provided with a hole 61h through which a connecting pin extending rearward can project. The left and right ends of the rear edge of the upper plate 61f are provided with contact portions 61i that protrude rearward. A rearwardly protruding inner portion of the rear end edge of the contact portion 61i further protrudes rearward, whereby the contact portion 61i has an L shape. The abutting portion 61i abuts on the front surface and the inner surface in the left-right direction of the prismatic body 55 constituting the rear wall portion.

  The covering member 62 adjacent to the lower side of the covering member 61 has substantially the same configuration as the covering member 61 as shown in FIG. The difference is that the thickness of the side plate 61b is t and the length in the left-right direction of the cover plate 62a is greater than that of the cover plate 61a so that the cover plate 62a can slide between the side plates 61b of the cover member 61 in the vertical direction. It is formed shorter by t × 2 + Δt (Δt is, for example, 0.3 to 0.6 mm).

  Further, the covering plate 62a is disposed so that the upper end of the front surface thereof is slidably in contact with the rear surface of the covering plate 61a, so that the thickness of the covering plate 61a is t, and the guide piece 62c is moved backward by t + Δt. Shift. For this reason, the guide piece 62c is extended forward by t + Δt from the guide piece 61c so that the front end edge of the guide piece 62c contacts the rear surface of the front wall portion 52 of the guide rails 5 and 5.

  Similarly, the flange 62d is also extended outward in the left-right direction by t + Δt. Further, the angle formed by the left-right direction and the inclined direction of the inclined plate 62e is θ so that the rear end edge of the bent piece 62e can come into contact with the front surface 56a of the protruding piece 56 of the guide rail 5 by (t + Δt) / cos θ. It is extended diagonally downward. The upper plate 62f is formed to have a length in the front-rear direction that is shorter by t + Δt.

  The two pin fixing pieces 62g bent downward from the middle part of the rear end edge of the upper plate 62f are largely cut out downward from the upper edge to form a U-shape, and are adjacent to each other at the notched part. The upper pin fixing piece 61g to be received can be received freely. In addition, the U-shaped pin fixing piece 62g has a shape in which the lower end corner is curved in an arc shape, so that the stress concentration in the corner is relatively less than that in which the corner is bent at 90 degrees. Can be relaxed.

  Further, a buffer member 62j is provided on the upper surface of the contact portion 61i to contact the lower surface of the upper plate 61f and prevent the upper plate 62f from directly contacting the upper plate 61f. Other points are the same as the covering member 61.

Here, the length h ₂ in the vertical direction of the guide piece 61 c of the covering member 61 is set to be not less than the length h ₁ in the vertical direction of the covering plate 62 a of the covering member 62. As a result, the distance between both ends in the moving direction of the work unit 2 in which the adjacent covering member 61 and the covering member 62 overlap each other can be increased, and the covering member 62 hardly tilts with respect to the covering member 61 and can be stably moved up and down. Can slide in the direction.

  The covering members 63 to 67 are also formed to have the same relationship as the adjacent upper covering member. Therefore, the covering plates 61a to 67a of the covering members 61 to 67 are overlapped in the plate thickness direction. However, as shown in FIG. 7, the lowermost covering member 67 has two pin fixing protrusions 67k and 67k having a hole 67h in the lower part of the rear surface of the covering plate 67a, instead of the pin fixing piece. Is protruding. Connecting pins 61m to 67m extending rearward are provided in the hole portions 61h to 67h of the pin fixing pieces 61g to 66g and the pin fixing protrusion 67k.

  A pair of end link bars 68a and 68a are pivotally supported at the ends of the connecting pins 61m and 67m. A pair of intermediate link bars 68b and 68b are pivotally supported by the connecting pins 62k to 66k so as to be swingable at the intermediate portion (center portion). Corresponding ends of the end link bar 68a and the intermediate link bar 68b are connected to each other by a connecting pin 68c so as to be swingable, thereby connecting the covering members 61 to 67 slidably in the vertical direction. A link mechanism 68 is configured.

  In the elastic cover device 1 of the embodiment, a pair of end link bars 68a and 68a are provided on the cover plates 61a and 67a located at both ends in the thickness direction of the cover plates 61a to 67a, the upper plate 61f, the pin fixing piece 61g, It is slidably connected at its end via a connecting pin 61k or via a pin fixing projection 67j and a connecting pin 67k. In the telescopic cover device 1 of the embodiment, a pair of intermediate link bars 68b are provided on the covering plates 62a to 66a located between the covering plates 61a and 67a located at both ends in the thickness direction of the covering plates 61a to 67a. , 68b are slidably coupled at intermediate portions thereof via upper plates 62f to 66f, pin fixing pieces 62g to 66g, and coupling pins 62k to 66k.

  A lower plate 67n is welded to the lower edge of the cover plate 67a and the side plate 67b. Four stopper portions 67p protruding upward are provided on the upper surface of the lower plate 67n. In the embodiment, the stopper portion 67p is provided on the covering plate 67a via the lower plate 67n. The stopper portion 67p is in contact with the lowermost end link bar 68a of the pantograph link mechanism 68, thereby preventing the angle formed by the pair of end link bars 68a from being 180 degrees or more. .

  As a result, the telescopic cover device 1 according to the embodiment does not shorten the telescopic stroke from the initial state when the angle formed by the pair of end link bars 68a, 68a is 180 degrees or more, and moves the work unit 2 up and down. By the operation, it is possible to prevent damage due to an excessive load applied to the link bars 68a, 68b, etc., and improve durability.

  The lower extension cover 7 has the same configuration as the upper extension cover 6, and the lowermost covering member 77 is fixed to the lower end of the guide rail 5. A fixing plate 79 that can be fixed to the lower surface of the front cover 21 of the work unit 2 is provided on the upper surface of the upper plate 71f of the covering member 71 located at the top. A fixing plate 69 that can be fixed to the upper surface of the front cover 21 of the work unit 2 is provided on the lower surface of the lower plate 67 n of the covering member 67 positioned at the lowest position of the upper telescopic cover 6.

  Further, a front / rear extending / contracting cover device 43 that is extendable in the front / rear direction and covers the front portion of the ball screw 41 is provided on the upper surface of the base 4. The front / rear expansion / contraction cover device 43 has the same configuration as the expansion / contraction cover mechanisms 6 and 7, and covers members 431 to 437 corresponding to the cover members 61 to 67 of the upper expansion / contraction cover mechanism 6, a pantograph-type link mechanism and a pair of illustrations omitted. And a guide rail. A covering member 431 located at the rearmost position is attached to the lower end of the front surface of the unit support 3, and a covering member 437 located at the foremost position is fixed to the base 4. The front / rear extension / contraction cover device 43 extends / contracts in the front / rear direction together with the unit support 3 that moves in the front / rear direction by the rotation of the ball screw 41 by the motor 41a.

  Next, the operation of the telescopic cover device 1 will be described. The telescopic cover device 1 is attached to the front surface of the unit support 3 and moves back and forth with the unit support 3 by the rotation of the ball screw 41. When the work unit 2 is raised by the rotation of the ball screw 31, the upper telescopic cover mechanism 6 is pushed upward through the fixing plate 69 fixed to the upper surface of the front cover 21 and contracted, and is fixed to the lower surface of the front cover 21. The lower telescopic cover mechanism 7 extends by being pulled upward via the fixing plate 79. On the contrary, when the work unit 2 is lowered by the rotation of the ball screw 41, the upper telescopic cover mechanism 6 is extended by being pulled downward via a fixing plate 69 fixed to the upper surface of the front cover 21, and on the lower surface of the front cover 21. The lower expansion / contraction cover mechanism 7 is pushed down through the fixed plate 79 and is contracted.

  According to the telescopic cover device 1 of the embodiment, for example, if the fixing plate 79 of the lower telescopic cover mechanism 7 is removed from the lower surface of the front cover 21 with the work unit 2 raised, the lower telescopic cover mechanism 7 is moved downward. Can be shortened. Thereby, the lower part of the front cover 21 can be opened without removing the telescopic cover device 1 from the unit support 3, and the maintenance of the machine unit 2 is facilitated.

  Further, since the extension cover mechanisms 6 and 7 are guided in the vertical direction by the guide pieces 61c to 67c and 71c to 77c extending downward from the lower end edges of the side plates 61b to 67b and 71b to 77b, the covering plates 62a to 67a. , 72a to 76a are difficult to tilt, and the stretchability can be improved.

  In the expansion / contraction cover device 1 according to the embodiment, the expansion / contraction cover mechanism has been described as extending and contracting in the vertical direction. However, the present invention is not limited to this, and for example, the present invention can be applied to a mechanism that expands and contracts in the horizontal direction. it can.

  Further, in the telescopic cover device 1 of the embodiment, the covering members 67 and 77 provided with the stopper portions 67p and 77p have been described, but the covering members 61 and 71 may also be provided with a stopper portion.

  Moreover, in the expansion / contraction cover device 1 of the embodiment, a so-called split type provided with a pair of upper and lower expansion cover mechanisms 6 and 7 has been described, but the upper and lower corresponding cover plates can be slid freely on the guide rails 5 and 5. The present invention can be similarly applied even to a so-called integral type in which the connecting members are vertically integrated.

  In the embodiment, the extension cover device 1 has been described as the extension cover device of the present invention. However, the front and rear extension cover device 43 configured in the same manner as the extension cover mechanisms 6 and 7 may be the extension cover device of the present invention. .

The schematic diagram which shows embodiment of the work unit using the expansion-contraction cover apparatus of this invention. The perspective view which shows the expansion-contraction cover apparatus of embodiment. The perspective view which shows the upper end part of the structural member of the expansion-contraction cover apparatus of embodiment. The rear view which shows the expansion-contraction cover apparatus of embodiment. The perspective view which shows the coating plate of embodiment. The perspective view which shows the coating plate of embodiment. The perspective view which shows the coating plate of embodiment. The perspective view which shows the state which laminated | stacked the coating plate of embodiment two or more.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Telescopic cover apparatus, 61a-67a ... Cover plate, 67p ... Stopper part 68 ... Pantograph type link mechanism, 68a ... End link bar, 68b ... Middle link bar, 71a-77a ... Cover plate, 77p ... Stopper part 78 ... Pantograph type link mechanism, 78a ... End link bar, 78b ... Intermediate link bar.

Claims (1)

A plurality of cover plates stacked in the plate thickness direction and a pantograph type link mechanism for slidably connecting the cover plates are provided. The pantograph type link mechanism has an end portion on each cover plate positioned at both ends in the plate thickness direction. A pair of end link bars that are pivotally supported by the shaft and a pair of intermediate links whose intermediate portions are pivotally supported by the respective cover plates located between the two cover plates located at both ends in the plate thickness direction. In a telescopic cover device comprising a bar and configured such that corresponding ends of each link bar are swingably connected to each other,
An expansion / contraction cover characterized in that a stopper portion is provided on the covering plate located at the end in the plate thickness direction so as to prevent the angle formed by the pair of end link bars from being 180 degrees or more by contacting the end link bar. apparatus.

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