JP2006205307A - Expansion cover of machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion cover for a machine tool, for operating uniform force in lifting and lowering. <P>SOLUTION: A pair of rigid end plates E are integrally fixed to both upper-lower end parts of a cover body C forming a flat or substantially U-shape in a bottom surface view from bellows 1 for performing the expansion action in the vertical direction, and a plurality of rigid intermediate plates M are similarly integrally fixed to an intermediate part. An angle-shaped refraction link 30 of a toggle joint T is formed in a zigzag form of bilaterally symmetrical vertical two rows. While respectively wholly pivoting its crest part (a) on the end plates E and the intermediate plates M, a pair of left and right compression coil springs 38 for pressing and energizing the refraction link 30 in the always contracting slide direction, are respectively wound on both end parts of a slide guide rod 33 for respectively horizontally penetrating between the mutual left and right of mutual residual trough parts (b), and are determined to be used by respectively installing the upper side end plate E of the cover body C on the fixed body side of the machine tool, and similarly the lower side end plate E on the lifting motion body side of the machine tool. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is installed between the upper and lower sides of the fixed body side and the lifting and lowering body side in a machine tool to protect the lifting and lowering (linear) motion guide device from various obstacles such as cutting waste, cutting oil and dust. It is related with a telescopic cover.

Technical means for covering a linear motion guide device such as a ball screw, a ball spline, a slide rail, etc. in a machine tool with an expansion / contraction cover made of a gate-shaped bellows is described in, for example, Japanese Patent Application Laid-Open Nos. 9-42449 and 2001-153226. As is known.
Japanese Patent Laid-Open No. 9-42449 JP 2001-153226 A

  However, in the case of an extendable cover (bellows) for a guide device that horizontally moves linearly in the front-rear (Y-axis) direction and the left-right (X-axis) direction as in the above-described known invention, the vertical (Z-axis) direction. As a telescopic cover for a guide device that moves up and down, it cannot be expanded and contracted smoothly and stably under an equal force in the vertical direction, which becomes more pronounced as the lifting stroke becomes larger. It is easy to cause illegal distortion and run-out.

  When the cover is lowered, the self-gravity of the expansion / contraction cover is applied, so that the action is lighter or faster, while when it is raised, it is subjected to the resistance of self-gravity. This is because of the unequal force with the rise. As a result, the lifting / lowering guide apparatus is adversely affected, and the durability of the expansion / contraction cover itself is also lowered at an early stage.

  SUMMARY OF THE INVENTION The present invention aims to solve such problems, and in order to achieve the object, in claim 1, a cover main body shaped in a substantially U shape in a plan view and a bottom view from a bellows that expands and contracts vertically. A pair of rigid U-shaped corresponding end plates that are bonded and integrated to the upper and lower ends of the cover body, and integrated with the intermediate part of the cover body at regular intervals. Consisting of a plurality of rigid intermediate plates that are substantially U-shaped correspondingly,

  While the vertical refraction link of the toggle joint is formed as a two-column vertical zigzag symmetrical with respect to the cover body, it pivots to the end plate and the intermediate plate, respectively.

  Wrapping the left and right pairs of compression coil springs that press and urge in the sliding direction to constantly contract the refraction link, around both ends of the slide guide rod that penetrates and traverses between the left and right sides of the remaining valleys,

  By attaching and using the upper end plate of the cover body to the stationary body side of the machine tool and the lower end plate to the lifting and lowering body side of the machine tool, the urging force of the compression coil spring counteracts the gravity of the cover body. It is determined to work as a boosting aid to gain.

  Further, in the second aspect, as a configuration dependent on the first aspect, the bending stays for the cantilevered link cantilevered bearings of the toggle joint are protruded from the front plate surface of the end plate in the rearward direction as a pair arranged in parallel symmetrically. While welding the cantilever bearing fork for the refractive link to the rear end,

  From the front plate surface of the intermediate plate, a pair of left and right symmetrical link link support bearing mounting stays corresponding to the end plate side mounting support stays corresponding to the end plate side is also extended rearward, and the rear end of the extension Welding double-end bearing forks for refracting links,

  With the ridges of the refraction link in the toggle joint inserted into the cantilever bearing fork for the refraction link of the end plate and the cantilever bearing fork for the refraction link of the intermediate plate, the pivots that pass through the bearing forks are respectively inserted. It is attached by a pin.

  In the third aspect, as a configuration dependent on the first aspect, the rear end portions of the left and right side plate surfaces of the intermediate plate partially protrude inward as a substantially L-shaped sandwiching piece wide by a certain depth. ,

  The first to third idler rollers that can roll up and down along the left and right sides of the machine tool are arranged in an overall U-shape in a plan view and a bottom view on the protruding edge portions of the both sandwiching pieces. It is characterized by being pivotally supported.

  Further, in claim 4, as a structure dependent on claim 1, the refractive links of the toggle joint are arranged and arranged in a vertically symmetrical two-row zigzag form at the center of the front wall surface of the cover body,

  Similarly, the pantographs are arranged and arranged as two vertically symmetrical rows that can expand and contract in the vertical direction on the periphery of the front wall surface of the cover body,

  The X-shaped intersections of the refraction links scattered in the middle part of the pantograph are pivoted to the intermediate plate, and the V-shaped intersections of the refraction links located at both upper and lower ends of the pantograph are pivotally attached to the end plate. It is characterized by.

  According to a fifth aspect of the present invention, as a subordinate structure of the fourth aspect, a bearing seat in which pantograph bearing mounting stays project from the front plate surface of the end plate in the rearward direction as a pair parallel to the left and right and welded to the rear end portion of the projecting While the pantograph pivot pin protrudes backward and integrally,

  A pair of symmetrical pantograph bearing mounting stays corresponding to the pantograph bearing mounting stays on the end plate side from the front plate surface of the intermediate plate are also projected rearward, and a pivot pin for pantographs is projected to the rear end of the projection. Welding to the protruding state

  The X-shaped intersections of the refraction links scattered in the middle part of the pantograph are connected to the pivot pins on the intermediate plate side, and the V-shaped intersections of the refraction links located on both upper and lower ends of the pantograph are the end plate side. It is characterized by being attached to each of the pivot pins in the inserted state from the rear.

  According to the above configuration of the first aspect, the pair of left and right compression coil springs wound around the slide guide rod forming the toggle joint serves as a boost mechanism capable of resisting the gravity of the extendable cover. Since the urging force is exerted, when the cross rail of the machine tool or other lifting and lowering body rises, it pushes and assists the expansion / contraction cover to be contracted, and the lifting and lowering body lowers on the contrary. At this time, resistance is given to the expansion / contraction cover to be extended (expanded), and an equal force can be applied to the expansion / contraction cover when it is raised and lowered.

  As a result, the expansion / contraction action of the expansion / contraction cover following the lifting / lowering movement body can be performed remarkably smoothly and stably, and the compression coil spring is a short product in which the left and right are distributed and arranged in pairs. Together, it can sufficiently resist a large amount of gravity, and the durability is remarkably improved, so that it is particularly effective for a machine tool having a large lifting stroke.

  Moreover, since the cover body is shaped like a U-shaped flat / bottom view from the bellows that expands and contracts in the vertical direction, the front wall and the left and right side walls ensure the front and left and right sides of the machine tool. It can coat | cover and can fully protect the guide apparatus of the said raising / lowering moving body from various obstructions, such as cutting oil, cutting waste, and dust.

  In addition, a pair of upper and lower end plates and a plurality of intermediate plates, which are substantially U-shaped corresponding to the cover main body, function as rigid muscles that reinforce the cover main body composed of an elastically deformable bellows. Since the refractive link of the joint is pivotally attached, it can be said that it is an extremely rational assembly structure.

  In this regard, if the configuration of claim 2 is adopted, the toggle joint can be incorporated into the back side (inside) of the cover body in a symmetrical state and a flat state with a shallow depth, and the cover body can be incorporated into a machine tool. There is an effect that it can be kept in the covering state as close as possible.

  Moreover, if the structure of Claim 3 is employ | adopted, the 1st-3rd idler roller will be on the right-and-left both sides (sliding surface) of a machine tool in the back end part of the intermediate | middle plate which maintains a fixed up-down mutual space | interval. Because it is pivotally supported as an overall U-shaped arrangement across the top and bottom, the expansion / contraction action of the expansion / contraction cover along the vertical direction can be performed more smoothly and stably, and the deformation of the expansion / contraction cover is illegal. There is an effect that can prevent the movement and swinging.

  Furthermore, if the structure of Claim 4 is employ | adopted, a toggle joint will be arranged and installed in the center part of the front wall surface in a cover main body, and the peripheral part which occupies both the left and right sides of the front wall surface will expand-contract vertically. Since the pantographs that act are also arranged, the cover body can be expanded and contracted more smoothly and stably in a balanced state.

  In that case, if the configuration of claim 5 is adopted, the pantograph can also be arranged in a laterally balanced state behind the front wall surface (inside) of the cover main body and arranged in a flat state with a shallow depth. There is an effect that an excessive dead space is not generated between the machine tool and the machine tool in a covering state as close as possible to the machine tool.

  Hereinafter, the specific configuration of the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 5 showing the expansion / contraction cover, (C) is a cover body that expands and contracts in the vertical direction. A plurality of the bellows (1) made of a substantially U-shaped rubber (preferably nitrile rubber) sheet (1 in total in the illustrated example) are continuously integrated in a spliced state.

  The front wall surface (Cf) and the left and right side wall surfaces (Cs) of the cover main body (C) formed from such a bellows (1) are both a crest (f1) (s1) and a trough (f2) (s2 It goes without saying that it is continuous in an alternating zigzag form.

  In the illustrated extension cover, for a portal machine tool, the width (w) of the front wall surface (Cf) of the cover body (C) is about 1590 mm, and the depth (d) of both side wall surfaces (Cs) is about 352 mm. The bellows (1) has a pitch (refractive width) of about 50 to 60 mm, a total length of about 2968 mm when fully extended (deployed), and a size of about 320 mm when fully contracted (folded). Has an amount of expansion and contraction.

  (E) is a pair of end plates bonded and integrated to the upper and lower ends of the bellows (1) forming the cover main body (C), and covers from a steel plate having a certain thickness (about 3.2 mm in the example). It is punched into a substantially U shape in a plan view and a bottom view provided with a front plate surface (Ef) corresponding to the main body (C) and both left and right side plate surfaces (Es). The plate width is about 50 to 60 mm corresponding to the pitch of the bellows (1).

  As shown in FIG. 6, the end plate (E) is punched and the edge of the front plate surface (Ef) is extracted and shown in FIG. 6, and a slide guide rod receiving stopper (2) of a toggle joint (T) described later. In the same manner as above, a plurality of the stays for bending link cantilever bearings (3), pantograph receiving stoppers (4) and pantograph bearing mounting stays (5) form the vertical center line (OO) of the cover body (C). As the entire left-right symmetric distribution dot distribution state as a boundary, both are projected backward (inward). In the example shown in the figure, these overhang lengths are only about 60 mm for that of the longest slide guide rod receiving stopper (2).

  In addition, a pair of left and right slide guide rod receiving stoppers (2) is located at the center of the front plate surface (Ef), and the refractive link cantilever bearing mounting stays sequentially from here to the left and right sides. (3) The pair of left and right pantograph receiving stoppers (4) and one set of pantograph receiving stoppers (4) are installed in parallel, and the pantograph receiving stopper (4) between the adjacent left and right sides of the above pantograph bearing mounting stay ( 5) are interposed.

  Then, a bearing seat (6) as shown in FIG. 7 is welded at a substantially right angle to the rear end portion of the pair of left and right pantograph bearing mounting stays (5) protruding from the front plate surface (Ef). A pivot pin (7) of a pantograph (P), which will be described later, projects rearward and integrally from the bearing seat (6).

  On the other hand, a pair of left and right refraction link cantilever bearing mounting stays (3) is also projected from the front plate surface (Ef) at the rear end thereof for the refraction link of the toggle joint (T) as shown in FIGS. A cantilever bearing fork (8) is welded. (9) is a pivot pin receiving hole formed through the cantilever bearing fork (8).

  Further, (M) is a plurality of (7 in total in the figure) intermediate plates arranged in a parallel horizontal state maintaining a constant vertical distance (h) to the intermediate part of the cover body (C), Flat and bottom view U with almost constant thickness (about 2.3mm in the example) and a front plate surface (Mf) and left and right side plate surfaces (Ms) corresponding to the cover body (C). At the joint portion of the bellows (1), the front plate surface (Mf) and the side plate surfaces (Ms) of each intermediate plate (M) are punched into a letter shape and form the cover body (C). The front wall surface (Cf) and both side wall surfaces (Cs) are interposed between the mountain portions (f1) and (s1) where the two side wall surfaces (Cs) are continuous.

  And only in the joint part of the said bellows (1) in which each such intermediate | middle plate (M) interposes, the shield plate (S) made from an aluminum alloy from the front side (outside) has the peak part (f1) ( s1) A plurality of (seven in the illustrated example) intermediate plate (M) and shield plate (7 in the illustrated example), which are attached and integrated in a sandwiched and sealed state of each other, and maintain the above-described constant vertical distance (h). S) can function as a rigid joint of the bellows (1) as a horizontal muscle bone of the cover body (C) that is elastically deformed.

  However, with the bellows (1) of the cover body (C) as a whole, the front wall surface (Cf) and the side wall surfaces (Cs) are connected to the continuous peaks (f1) (s1). Insert the intermediate plate (M) from the back (inside) and attach the shield plate (S) from the opposite front (outside) to the crests (f1) (s1) in a sealed state. Also good. In this case as well, it goes without saying that the intermediate plates (M) maintain a constant vertical distance (h).

  Each intermediate plate (M) has the same plate width of about 50 to 60 mm as the end plate (E), but the front plate surface (Mf) of the intermediate plate (M) is different from that of the end plate (E). A piece (10) is bent at a substantially right angle, and a separate steel plate attachment plate (11) is attached to the angle piece (10) of the front plate surface (Mf) in a superposed state and welded.

  As extracted and shown in FIG. 10 from the edge portion of the separate attached plate (11), the slide guide rod receiving stopper (12) of the pre-adjusted toggle joint (T) and the mounting stay for the bifurcated bearing (both are also supported by the refraction link). 13) As well as the left and right pair of pantograph bearing mounting stays (15), the overall left-right symmetrical distribution point distribution state with the vertical center line (OO) of the cover body (C) as a boundary is Both are projected in the rear direction (inward).

  In that case, the slide guide rod receiving stopper (12) protruding from the attached plate (11) of the front plate surface (Mf) of the intermediate plate (M), the bending link double-supported bearing mounting stay (13), and the mounting for the pantograph bearing The stay (15) includes the same slide guide rod receiving stopper (2) protruding from the front plate surface (Ef) of the end plate (E), the bending link cantilever bearing mounting stay (3), and the pantograph bearing mounting stay ( 5) are scattered in the positional relationship corresponding to each other.

  A pivot pin (17) of the pantograph (P) as shown in FIG. 12 is provided at the rear end of the attachment plate (11) for the pantograph bearing of the intermediate plate (M) that projects from the attached plate (11). Welded in a rearward protruding state.

  On the other hand, at the rear end portion of the intermediate plate (M) where the above-mentioned refractive link double-supported bearing mounting stay (13) projects from the attached plate (11), the refraction of the toggle joint (T) as shown in FIGS. A link double-ended bearing fork (18) is welded in an inserted state. (19) is a pair of left and right pivot pin receiving holes formed through the doubly supported bearing fork (18).

  As described above, both side plate surfaces (Ms) of the intermediate plate (M) are dimensioned to the same plate width as that of the end plate (E). 10 and 15, as suggested by FIGS. 10 and 15, the inward partial portion is formed as a substantially L-shaped sandwiching piece (20) that is wide (also about 125 mm) by a certain depth (about 145 mm in the example). Is overhanging.

  Moreover, the roller receiving groove (21) opened backward and notched in the projecting edge portion of each clamping piece (20) and the roller receiving groove (22) opened sideways (inward) have first, Two idler rollers (23) and (24) are pivotally supported as their mutually orthogonal arrangement relation. Separate blade pieces (not shown in the figure) that pivotally support the first and second idle rollers (23) and (24) are fixedly integrated with the holding piece (20).

  (25) is a pair of left and right separate restraint pieces each having a roller receiving groove (26) that opens forward facing the roller receiving groove (21) facing backward, and is formed by a plurality of fixing bolts (27). Each of the holding pieces (20) is detachably attached, and a third idler roller (28) is pivotally supported in the forward-facing roller receiving concave groove (26).

  That is, the first to third idle rollers (23), (24), and (28) are arranged in a U-shape in plan view and bottom view as shown in FIGS. The cover main body (C) smoothly expands and contracts vertically along both the left and right sides (sliding surfaces) of the machine tool, so that the left-right balanced state on the expansion and contraction can be maintained. The first to third idle rollers (23), (24) and (28) are all made of nylon containing molybdenum, and in the case of the figure, the diameter is about 15 mm × length is about 17 mm.

  The pantograph (P) mentioned earlier is an equal fixed length (in the example shown, approximately 260 mm) as two vertically symmetric pairs with a vertical center line (OO) of the cover body (C) as a boundary. ) Having a plurality of refracting links (29) that are pivotally connected in a vertically movable manner, and the X-shaped intersections distributed in the middle of the reciprocal links (29) The horizontal intermediate plate (M) arranged at a distance (h) is attached to the pivot pin (17) protruding from the mounting stay (15) for the pantograph bearing in the inserted state from behind (inner side). ing.

  Similarly, the V-shaped intersections of the short refraction links (29), which are located at both upper and lower ends of the pantograph (P), are attached to the pantograph bearing mounting stay (5) of the horizontal end plate (E). Are attached to the pivot pins (7) protruding from the back (inner side), and when the cover main body (C) is contracted (folded), the pantograph (P) has a refractive link (29). However, the receiving is regulated by the pantograph receiving stopper (4) of the end plate (E).

  In addition, the toggle joint (T) mentioned above also has the same fixed length as a set of two vertically symmetrical rows with the vertical center line (OO) of the cover body (C) as a boundary. A plurality of square-shaped refracting links (30) are pivotally connected in a zigzag configuration in which ridges (a) and valleys (b) conform to the bellows (1) of the cover body (C). It can be expanded and contracted in the vertical direction.

  Moreover, the intersection of the refraction links (30) forming the peak portion (a) corresponding to the bellows (1) of the cover body (C) while being located at the intermediate portion of the toggle joint (T) is the intermediate plate. The pair of pivots in a parallel state as shown in FIGS. 16 to 19 are inserted into the doubly-supported bearing forks (18) attached to the (M) refraction link doubly-supported bearing mounting stay (13). Each is attached by a pivot pin (31) passing through the support pin receiving hole (19).

  On the other hand, each of the refracting links (30) remaining on the upper and lower ends of the toggle joint (T) is also a piece attached to the corresponding refracting link cantilever bearing mounting stay (3) of the end plate (E). Under the state of being inserted into the cantilever bearing fork (8) as shown in FIGS. 16 to 18 and FIG. 20, the pivot pin (32) penetrating through the one pivot pin receiving hole (9) It is still attached.

  The refraction link (30) forming the two vertical rows of toggle joints (T) has a certain length between the left and right sides of the valley (b) corresponding to the bellows (1) of the cover body (C). It is pivotally connected by a plurality of slide guide rods (33) (total of 8 in the illustrated example) provided with (approximately 700 mm in the illustrated example).

  (34) is a doubly-supported bearing fork that supports the valley (b) of the refraction link (30), and a pair of pivot pins (35) passing through the refraction link (30) refraction link (T) 30), a slide guide rod support stay (36) protrudes rearward and integrally from the both-end bearing fork (34) as shown in FIGS. The slide guide rod (33) is penetrated and horizontally mounted in (36) as a horizontal loose state. (37) shows a pair of left and right spring receiving heads attached to both ends of the slide guide rod (33).

  Further, a compression coil spring (38) is interposed between the left and right sides of the support stay (36) and the spring receiving head (37) in the slide guide rod (33). By means of a pair of short compression coil springs (38), the toggle joint (T) is pressed and urged in the sliding direction (folding direction) in which the rectangular refraction link (30) is always contracted, and the large self-extension cover is self-supporting. It forms a boost mechanism that can sufficiently resist gravity.

  In this regard, one extension coil spring is inserted between the left and right sides of the slide guide rod support stay (36), and the dog-shaped refracting link (30) is pulled in the sliding direction in which it always contracts. However, it is difficult to counter the large self-gravity of the expansion / contraction cover, and repeatedly receiving such large self-gravity may cause it to stretch out and fall down or break out early. It is not preferable in terms of poor smoothness and durability.

  In any case, when the cover body (C) is contracted (folded), the slide guide rod (33) of the toggle joint (T) is connected to the slide guide rod receiving stopper (2) of the end plate (E) and the intermediate plate. The sliding guide rod receiving stopper (12) in FIG.

  Note that (39) is a plurality (four in total in the illustrated example) pasted to the back (inside) of the cover body (C) in a symmetrical distribution state with the vertical center line (OO) as a boundary. ), Which is preferably made of the same rubber as the bellows (1) and improves the durability of the cover body (C).

  When using the telescopic cover having the above-described configuration, as shown in FIGS. 22 and 23, the upper end plate (E) of the cover body (C) is directly or via an appropriate adapter fitting (not shown). While attaching to the column (40) of the machine tool or other fixed body side, the lower end plate (E) of the cover body (C) is also directly or via an appropriate adapter fitting (not shown). Mounting on the cross rail (43) carrying the machine tool saddle (41) and the machining head (42) and other lifting / lowering body side, and lifting / lowering (straight) motion guide devices for the ball screw (44), ball spline, lifting rail, etc. 4 and 22 and 23, the front wall surface (Cf) and the left and right side walls of the cover body (C) as shown in FIGS. It is to covered by (Cs). Incidentally, (45) shows a drive motor for the ball screw (44), (46) shows a work table, and (47) shows a bed.

  Then, the pressing biasing force of the refraction link (30) by the pair of left and right compression coil springs (38) wound in a distributed manner around the slide guide rod (33) forming the toggle joint (T) is large in the expansion cover. This acts as a contraction biasing force (push-up assisting force of the expansion / contraction cover) of the cover main body (C) that can resist self-gravity, and provides resistance to the expansion force (lowering force) of the expansion / contraction cover.

  In other words, when the cross rail (43) on the lifting and lowering body side in the machine tool is lowered, since the gravity force is applied to the telescopic cover that descends accompanying the cross rail (43), the lowering action becomes lighter or faster. When the cross rail (43) is lifted, the telescopic cover that rises following the cross rail (43) receives a resistance of its own gravity, so that its lifting action becomes heavy or slows. Uneven power works.

  In this regard, according to the configuration of the present invention, the toggle joint (T) serves as a boost mechanism capable of resisting the gravity of the extension cover, and the extension cover to be extended (expanded) when the cross rail (43) is lowered. For the expansion cover that gives resistance to the cross rail (43) and also tries to contract (fold) when the cross rail (43) is reversely lifted. It is possible to make the force equal to that at the time of rising and to work stably, which is useful for smoothening the stretching action along the vertical direction and improving the durability.

  The toggle joint (T) is arranged in the center of the cover body (C), and a pair of pantographs (P) are arranged in a symmetrical manner in the peripheral area occupying both the left and right sides. Therefore, the cover main body (C) composed of the bellows (1) expands and contracts evenly on both the left and right sides, and the first to third idle rollers (23), (24) and (28) work. Combined with rolling on both the left and right sides (sliding surfaces) of the machine, it can prevent unauthorized distortion and deflection of the cover body (C), and it is excessive between the machine tools. It is possible to keep the covering state as close as possible to the ascending / descending (linear) motion guide device of the protection target without generating a dead space.

  However, when the width (w) of the cover body (C) is relatively narrow and the expansion / contraction cover is small, the installation of the pantograph (P) is omitted and only the toggle joint (T) serving as the booster mechanism is provided. If the expansion / contraction cover is enlarged, the Toggle Joint (T) or Pantograph (P) is added as 4 columns vertically symmetrically arranged with respect to the cover body (C). It doesn't matter.

It is a front view of the expansion-contraction cover which concerns on this invention. It is a rear view of FIG. It is a rear view corresponding to FIG. 2 which shows the contraction state of an expansion-contraction cover. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a disassembled slope figure which shows an expansion-contraction cover simply. It is a top view which extracts and shows an end plate. It is a slope view which extracts and shows the bearing part for pantographs in an end plate. It is a top view which extracts and shows the refractive link cantilever bearing fork of a toggle joint. It is a front view of FIG. It is a top view which extracts and shows an intermediate | middle plate. It is an 11-11 line expanded sectional view of FIG. It is a perspective view which extracts and shows the bearing part for pantographs in an intermediate | middle plate. It is a top view which extracts and shows the refraction-link both-ends bearing fork of a toggle joint. FIG. 14 is a front view of FIG. 13. It is the elements on larger scale of FIG. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 17 is a plan view of FIG. 16. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. 16. It is the 19-19 line expanded sectional view of FIG. It is a 20-20 line expanded sectional view of Drawing 16. It is a 21-21 line expanded sectional view of FIG. It is a front view which shows the attachment use state of the expansion-contraction cover with respect to a machine tool. It is a side view of FIG.

Explanation of symbols

(1)-Bellows (2) (12)-Slide guide rod retaining stopper (3)-Retaining link cantilever bearing mounting stay (4)-Pantograph bearing stopper (5) (15)-Pantograph bearing mounting stay (6 ) · Bearing seat (7) (17) · Pantograph pivot pin (8) · Refraction link cantilever bearing fork (9) (19) · Pivot pin receiving hole (10) · Angle piece (11) · Attached plate (13)-Retention link double-supported bearing mounting stay (18)-Refraction link double-supported bearing fork (20)-Clamping piece (21) (22) (26)-Roller receiving groove (23)-First idle rotation Roller (24), 2nd idler roller (25), Restraint piece (27), Fixing bolt (28), 3rd idler roller (29) (30), Refraction link (31) 32) (35) ・ Pivot pin (33) ・ Slide guide rod (34) ・ Both-end bearing fork (36) ・ Slide guide rod support stay (37) ・ Spring receiving head (38) ・ Compression coil spring (39)・ Stretch prevention tape (40) ・ Column (fixed body)
(41) · Saddle (41) · Machining head (43) · Cross rail (lifting and moving body)
(44) Ball screw (lifting and moving guide device)
(45) · Drive motor (46) · Work table (47) · Bed (C) · Cover body (Cf) · Front wall surface (Cs) · Side wall surface (E) · End plate (Ef) · Front plate surface (Es ) ・ Side plate surface (M) ・ Intermediate plate (Mf) ・ Front plate surface (Ms) ・ Side plate surface (P) ・ Pantograph (S) ・ Shield plate (T) ・ Toggle joint (OO) ・ Vertical center Line (h), vertical spacing

Claims (5)

Cover body (C) shaped from a bellows (1) that expands and contracts in the vertical direction into a substantially U-shape in plan view and bottom view, and bonded and integrated to both upper and lower ends of the cover body (C) A pair of rigid end plates (E) that are substantially U-shaped, and a corresponding substantially U-shape that is integrated with the intermediate portion of the cover body (C) at regular intervals (h). Consisting of a plurality of rigid intermediate plates (M) forming a mold,
The end plate (E) and the intermediate plate are formed such that the cross-shaped refraction link (30) of the toggle joint (T) is formed in two vertical zigzag shapes symmetrical with respect to the cover body (C), and the crest (a) is spread. While pivoting to (M),
The remaining trough (b) compression coil spring (38) that presses and urges both ends of the slide guide rod (33) that penetrates and crosses between the left and right sides in the sliding direction to always contract the refraction link (30). Wrap one pair of left and right,
By attaching and using the upper end plate (E) of the cover body (C) to the stationary body side of the machine tool and the lower end plate (E) to the lifting and lowering body side of the machine tool, the compression coil spring (38) is used. An expansion / contraction cover for a machine tool characterized in that the urging force is set to act as a push-up assisting force that can counteract the gravity of the cover body (C). From the front plate surface (Ef) of the end plate (E), the refractive link cantilever bearing mounting stays (3) of the toggle joint (T) are projected in the rearward direction as a pair parallel to the left and right, and to the rear end of the projection While welding the cantilever bearing fork (8) for the refraction link,
A pair of symmetrical birefringent link support stays (a pair of bilaterally supported bendable bearing mounting stays corresponding to the end plate (E) side refracting link cantilever bearing mounting stay (3) from the front plate surface (Mf) of the intermediate plate (M). 13) is also projected rearward, and a doubly supported bearing fork (18) for a refractive link is welded to the rear end of the projecting,
The peak portion (a) of the refractive link (30) in the toggle joint (T) is connected to the cantilever bearing fork (8) for the refractive link of the end plate (E) and the double-supported bearing fork for the refractive link of the intermediate plate (M). 2. The machine tool according to claim 1, wherein the machine tool is mounted by pivot pins (32) and (31) respectively penetrating the bearing forks (8) and (18) while being inserted into the bearing forks (18). Telescopic cover. The intermediate plate (M) has a rear end portion of both left and right side plate surfaces (Ms) as a substantially L-shaped sandwiching piece (20) that is wide by a certain depth, and partially projects inward.
The first to third idle rollers (23), (24), and (28), which can roll up and down along the left and right sides of the machine tool, are seen in plan view and bottom view on the protruding edge portions of the both clamping pieces (20). 2. The expansion / contraction cover for a machine tool according to claim 1, wherein the expansion / contraction cover is pivotally supported in an arrangement state of an overall U shape. While arranging the refractive link (30) of the toggle joint (T) in the center part of the front wall surface (Cf) in the cover main body (C) as a two-column symmetrical zigzag configuration,
Similarly, the pantograph (P) is arranged and arranged in two vertically symmetrical rows that can expand and contract in the vertical direction on the periphery of the front wall surface (Cf) of the cover body (C),
The X-shaped intersections of the refraction links (29) scattered in the middle part of the pantograph (P) are connected to the intermediate plate (M), and the refraction links (30) are also located at both upper and lower ends of the pantograph (P). 2. The expansion / contraction cover for a machine tool according to claim 1, wherein the V-shaped intersections are pivotally attached to the end plate (E). From the front plate surface (Ef) of the end plate (E), a pantograph bearing mounting stay (5) is projected in the rearward direction as a pair parallel to the left and right, and the pantograph from the bearing seat (6) welded to the rear end portion of the projecting While the pivot pin (7) protrudes backward and integrally,
A pair of symmetrical pantograph bearing mounting stays (15) positioned corresponding to the pantograph bearing mounting stays (5) on the end plate (E) side from the front plate surface (Mf) of the intermediate plate (M) are also directed rearward. And pantograph pivot pin (17) is welded to the rear projecting state at the rear end of the overhang,
The X-shaped intersections of the refraction links (29) scattered in the middle part of the pantograph (P) are connected to the pivot pin (17) on the intermediate plate (M) side, and also to the upper and lower ends of the pantograph (P). 5. A machine tool as set forth in claim 4, wherein the V-shaped intersections of the refraction links (29) positioned are respectively attached to the pivot pins (7) on the end plate (E) side so as to be inserted from the rear. Telescopic cover of the machine.

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