JPH11277364A - Metallic bellows and metallic bellows with pantagraph mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic bellows with a pantagraph mechanism acting as a splash prevention cover smaller in size than a current telescopic cover. SOLUTION: This metallic bellows device 1 is provided with a metallic bellows 11, a pantagraph mechanism 12, and with paired machine mounting plates 13. The metallic bellows 11 is equipped with a plurality of metallic band 14 and a plurality of hinge members 15. In the respective metallic band 14, each metallic plate 16 is engaged with each combining plate 17 in recessed and projection part relation. Two metallic bands 14 are connected by the hinge members 15. The pantagraph mechanism is formed out of a plurality of bars, and of a plurality of connecting shafts. Each first connecting shaft 36 of the pantagraph mechanism 12 is connected with each hinge member 15 of the metallic bellows 11 by each supporting member 21. Third connecting shafts 38 and the metallic bands 14 at both the ends of the metallic bellows are fixed to the machine mounting plates 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal bellows and a metal bellows device with a pantograph mechanism.

[0002]

2. Description of the Related Art A conventional machine tool is provided between a portion for supporting a work and a processing unit for processing the work, and expands and contracts in accordance with the left and right movement of the processing unit. A scatter prevention cover that prevents splatters and the like from scattering toward the processing unit is known. For example, there is a telescopic cover disclosed in Japanese Patent Publication No. 2527920.

The conventional telescopic cover is shown in FIG.
As shown in FIG. 1, as the table body B reciprocates on the bed A, the pantograph-type link mechanism 101 expands and contracts, and the nesting type cover 102 expands and contracts.

[0004]

However, in the above conventional telescopic cover, when the link mechanism 101 is in the contracted state, an extra gap 103 is formed between the table body B and the link mechanism 101 in the expansion and contraction direction. I was Therefore, there is a problem that the length of the telescopic cover including the extra gap 103 becomes longer in the direction of expansion and contraction of the link mechanism 101, and the telescopic cover becomes larger.

[0005] A first object of the present invention is to provide a metal bellows device with a pantograph mechanism which is a shatterproof cover smaller than a conventional telescopic cover.
A second object is to provide a metal bellows suitable for a metal bellows device with a pantograph mechanism.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a plurality of metal bands are connected to each other by a hinge member to form a corrugated bellows shape. It has bellows as its gist.

The gist of the invention of claim 2 is that, in claim 1, the metal band and the hinge member are fitted in an uneven relationship. The invention of claim 3 is the invention of claim 2
In the above, a pair of recesses are formed on both sides in the width direction of the metal band, a pair of first protrusions are formed in the hinge member, and the first protrusions are fitted in the recesses. I have.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the metal band includes a metal plate having a pair of recesses on both sides in the width direction, and a pair of second plates on both sides in the width direction. And a coupling plate having a protrusion, the first protrusion of the hinge member is fitted in one of a pair of recesses formed in the metal plate, and the other is formed in the other recess. The gist is that the second projection of the coupling plate is fitted.

According to a fifth aspect of the present invention, there is provided the metal bellows according to any one of the first to fourth aspects, a pantograph mechanism for expanding and contracting the metal bellows, and a support for supporting the metal bellows with respect to the pantograph mechanism. And a metal bellows device with a pantograph mechanism, comprising:

According to a sixth aspect of the present invention, in the fifth aspect, the pantograph mechanism is configured to be expandable and contractable by a plurality of bars and a connecting shaft rotatably connecting the plurality of bars to each other. The gist of the invention is that the connecting shaft located on the center line of the expansion and contraction of the pantograph mechanism connects and supports the hinge member of the metal bellows via the supporting member.

[0011] The invention of claim 7 is the invention of claim 5 or claim 6.
In the above, the gist of the present invention is that the length of the pantograph mechanism at the time of the minimum contraction is longer than the minimum length of the metal bellows at the time of folding.

According to an eighth aspect of the present invention, in any one of the fifth to seventh aspects, a machine mounting plate is attached to both ends of the pantograph mechanism located on the center line of expansion and contraction and metal bands at both ends of the metal bellows. The gist is that it is being carried out.

(Function) According to the first aspect of the present invention, the metal band forming the metal bellows is formed of a metal material. Therefore, since the metal material has high rigidity, the metal band is not deformed by the inertial force generated when the metal bellows expands and contracts. In addition, since the metal material is excellent in water resistance, heat resistance, and the like, and has high strength, it can reliably receive flying objects.

According to the second aspect of the present invention, the concave portion formed on one of the metal band and the hinge member and the projection formed on the other are fitted to each other to join the metal band and the hinge member. ing. That is, the metal band and the hinge member are joined with a simple structure to form a metal bellows.

According to the third aspect of the present invention, the metal band and the hinge member are joined by fitting the concave portions formed on both sides in the width direction of the metal band with the first protrusion formed on the hinge member. Is done. That is, the metal band and the hinge member are joined with a simple structure to form a metal bellows.

According to the invention of claim 4, for example, in the two metal plates, the first projection of the hinge member is fitted into one of a pair of recesses formed in each metal plate, The second projection of the coupling plate is fitted into the other recess. As a result, the two metal plates and one coupling plate are connected.

That is, by appropriately changing the number of metal plates and coupling plates, the length of the metal band in the width direction is made longer than when the metal band is formed from only one metal plate. Therefore, in the metal bellows, the length of each metal band in the width direction is lengthened, so that the number of overlapping metal bands is reduced. As a result, the minimum length of the metal bellows when folded is shortened, and the metal bellows is reduced in size.

According to the fifth aspect of the present invention, when the pantograph mechanism is extended and contracted, the metal bellows is extended and contracted via the support member. Then, when the pantograph mechanism is contracted, the metal bellows is folded. Therefore, as compared with the conventional telescopic cover, the length in the expansion and contraction direction is shortened.

According to the sixth aspect of the present invention, the hinge member of the metal bellows is connected and supported by the connecting shaft located on the center line of the expansion and contraction of the pantograph mechanism via the support member. That is,
The pantograph mechanism and the metal bellows expand and contract as a unit.

In the seventh aspect of the present invention, when the pantograph mechanism is in the minimum contraction, a gap is formed between two adjacent metal bands of the metal bellows, and the two adjacent metal bands do not collide with each other.

According to the invention of claim 8, the pantograph mechanism and the metal bellows are mounted on the machine by the machine mounting plate.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view showing a machine tool 2 having a metal bellows device 1 with a pantograph mechanism (hereinafter simply referred to as a metal bellows device).
FIG. 2 is a schematic front view showing the machine tool 2. In FIG. 1, a machine tool 2 includes a jig base 4, a processing unit 5, and a pair of metal bellows devices 1 on a bed 3.
A jig base 4 for supporting a work (not shown) is fixed on the bed 3, and a processing unit 5 for processing the work is fixed on a table 6 movable on the bed 3 in the left-right direction. The bed 3 is provided with a drive unit (not shown), and the table 6 is moved left and right on a rail (not shown) by driving the drive unit.

On the bed 3, between the jig base 4 and the processing unit 5, a pair of left and right metal bellows devices 1 are supported so as to be able to expand and contract in the left and right directions. Each metal bellows device 1 has an outer end fixed to a base 3 a provided on the bed 3 and an inner end fixed to a bellows device mounting plate 6 a provided on the table 6. And
Each metal bellows device 1 expands and contracts in accordance with the movement of the processing unit 5 in the left-right direction, so that cutting oil, chips and the like are prevented from scattering to the processing unit 5 side.

As shown in FIG. 3, the metal bellows device 1 has a metal bellows 11, a pantograph mechanism 12, and a pair of machine mounting plates 13. Metal bellows 11
Has a plurality of metal bands 14 and a plurality of hinge members 15 and has a corrugated bellows shape. As shown in FIG. 6, each metal band 14 made of aluminum is
And a coupling plate 17. The metal plate 16 and the coupling plate 17 of the present embodiment are processed by aluminum extrusion. On both sides of each metal plate 16 in the width direction, a fitting groove 1 as a pair of recesses is formed along the longitudinal direction.
6a are formed. The inside of the fitting groove 16a has a substantially circular cross section, and the opening side is squeezed. On both sides of the coupling plate 17 in the width direction, a pair of second
A projection 17a is formed as a projection. Same ridge 17
a is formed such that the tip thereof is bulged in a substantially cylindrical shape, and the fitting groove 16a is formed.
Is fitted.

That is, in the two metal plates 16,
When the fitting grooves 16a facing each other are fitted into the respective ridges 17a of the coupling plate 17, the two metal plates 16 and one coupling plate 17 are integrally connected, and
Metal strips 14 are formed. Then, the coupling plate 17 is prevented from coming out of the metal plate 16 in the width direction of the metal plate 16.

As shown in FIG. 7, the two metal strips 14 are joined by a hinge member 15. The hinge member 15 is formed of elastic synthetic rubber. On both sides of the hinge member 15, a pair of projections 15a as a first projection is formed along the longitudinal direction. Each protruding ridge 15a is formed such that its tip bulges in a substantially cylindrical shape, and is fitted in a fitting groove 16a of a metal plate 16 constituting the two metal bands 14. That is, a pair of fitting grooves 1 formed in the metal plate 16 are formed.
6a of the fitting groove 16a on the side opposite to the coupling plate 17
The two metal strips 14 are connected to each other by fitting the ridges 15a.

A projection 15c having a substantially T-shaped cross section is formed in the center of one side of the hinge member 15 along the longitudinal direction. A pair of grooves 15b are formed on both sides of the neck of the projection 15c.
Are formed. At the center of the other side of the hinge member 15, a buffer ridge 15d is formed as a buffer portion having a triangular cross section along the longitudinal direction. Same buffer ridge 15d
Of each metal band 1 connected to the hinge member 15
4 is always in contact with one side. That is, the buffer ridge 15d
Is to prevent the adjacent metal strips 14 from contacting each other and to obtain a buffering action during expansion and contraction.

As shown in FIG. 3, the remaining hinge members 15 of the hinge members 15 except for the left and right ends are provided with support members 2.
1 is attached. The support member 21 includes a pair of sandwich plates 22 and a connection plate 23 having an insertion hole 23a. Each sandwiching plate 22 has an L-shaped cross section. Each sandwiching plate 22 is connected by a pair of bolts 24 and nuts 25 (only one is shown in FIG. 7) in a state where the bent portions 22a are engaged with the grooves 15b of the hinge member 15 so as to face each other. It is integrated with the plate 23. That is, in this state, the support member 21 is
It is attached and fixed.

Each support member 21 has a pantograph mechanism 12
Are connected. As shown in FIGS. 4 and 5, the pantograph mechanism 12 includes first to fourth bars 32 to 35 forming a plurality of bars and first to third connecting shafts 3 forming a connecting shaft.
6 to 38 are provided. A second bar 33 having the same length as the first bar 32 is sandwiched between the pair of first bars 32, and is connected to each other by a first connection shaft 36 so as to intersect at the center of each other. I have. That is, an X shape is formed by the pair of the first bar 32 and the second bar 33. Then, two sets of adjacent X-shaped bar groups are connected to the second connecting shaft 37.
Are connected to each other.

A third bar 34 is sandwiched between the first bars 32 of the X-shaped bar group located at both left and right ends.
They are connected to each other by a second connection shaft 37. Further, the second bar 33 of the X-shaped bar group located at the left and right ends.
Are pinched by a pair of fourth bars 35, and the second connecting shaft 37
Are connected to each other. Furthermore, the third bar 34
Are pinched by a pair of fourth bars 35, and the third connecting shaft 38
Are connected to each other. In this embodiment, the length between the axes of the third and fourth bars 34 and 35 (substantial link length)
Is set to half the length between the axes of the first and second bars 32 and 33 (substantial link length). As a result, the pantograph mechanism 12 forms a plurality (five in the present embodiment) of rhombuses as shown by a two-dot chain line in FIG. In the present embodiment, two pantograph mechanisms 12 are arranged in one metal bellows device 1 in parallel with each other. The first connection shaft 36 and the third connection shaft 38 are located on the center line α of the pantograph mechanism 12.

A bifurcated portion 36 is provided at the base end of each first connecting shaft 36.
a is formed, and an insertion hole 36b having a circular cross section is formed in the forked portion 36a. The connection plate 23 is disposed between the two forked portions 36a, and the insertion hole 36b and the insertion hole 23a formed in the connection plate 23 are provided.
, A cylindrical support pin 39 is inserted. As a result, the support members 21 are connected and supported on the respective first connection shafts 36. That is, the first connection shaft 36 of the pantograph mechanism 12 and the hinge member 15 of the metal bellows 11 are connected by the support member 21.

The lower part of each third connecting shaft 38 is attached to the mounting member 3.
8a rotatably supported. The mounting member 38a is fixed to the machine mounting plate 13 by screwing or the like. Further, metal strips 14 located at both ends of the metal bellows 11 are fixed to the machine mounting plate 13 with screws or the like. Further, one of the pair of machine mounting plates 13 is fixed to a base 3 a provided on the bed 3 by bolting. Also, the other machine mounting plate 13
Is a bellows device mounting plate 6a provided on the table 6.
It is fixed by bolting. Therefore, when the pantograph mechanism 12 expands and contracts with the movement of the processing unit 5, the metal bellows 11 expands and contracts integrally with the pantograph mechanism 12 via the support member 21.

In this embodiment, the pantograph mechanism 12
Is set such that its length at the time of the minimum contraction is longer than the minimum length at the time of folding of the metal bellows 11. The length at the time of the minimum contraction of the pantograph mechanism 12 in the present embodiment refers to the distance L1 between the centers of the pair of left and right third connection shafts 38 at the time of the minimum contraction. The minimum length of the metal bellows 11 when folded is the distance L2 between the centers of the hinge members 15 at the left and right ends when the metal bellows 11 contracts when it is not supported by the pantograph mechanism 12. In FIG. 3, the metal bellows 11 is used.
3 shows the distance L3 between the centers of the hinge members 15 at the left and right ends at the time of contraction when supported by the pantograph mechanism 12. Therefore, when the metal bellows 11 is supported by the pantograph mechanism 12, a slight gap is formed between the two adjacent metal bands 14, so that L3 is larger than L2. That is, when the pantograph mechanism 12 is in the minimum contraction, the two adjacent metal bands 1 of the metal bellows 11
A gap is formed between the four metal strips 4 so that the two metal strips 14 do not collide with each other.

Next, the operation of the metal bellows device 1 configured as described above will be described. When the work is processed by the processing unit 5, the position of the processing unit 5 in the left-right direction is set so as to correspond to the position of the work in the left-right direction. Here, it is assumed that the processing unit 5 is moved rightward in accordance with the position of the work.

In this case, the bed 3 is driven by the driving means.
The table 6 moves to the right on the rail provided at. Due to the movement of the table 6, the inner end of the left metal bellows device 1 of the pair of left and right metal bellows devices 1 moves rightward, and the inner end of the right metal bellows device 1 moves rightward. . At this time, the outer ends of the pair of left and right metal bellows devices 1 remain fixed. That is, the metal bellows device 1 on the left side is changed from the contracted state shown in FIG. 8A to the expanded state shown in FIG. 8B.
Further, the metal bellows device 1 on the right side is changed from an extended state to a contracted state, though not shown. The operation when the processing unit 5 is moved to the left in accordance with the position of the work is the reverse of the operation when the processing unit 5 is moved to the right. Therefore, when the processing unit 5 is moved in the left-right direction corresponding to the position of the work in the left-right direction, each metal bellows device 1 expands and contracts, and scattering of cutting oil, chips and the like to the processing unit 5 side is prevented. .

Therefore, according to the present embodiment, the following effects can be obtained. (1) In the present embodiment, the metal bellows 11 is expanded and contracted via the support member 21 by the expansion and contraction of the pantograph mechanism 12. When the pantograph mechanism 12 is contracted, the metal bellows 11 is folded. Therefore, as compared with the conventional telescopic cover, the length in the expansion and contraction direction is shortened. As a result, it is possible to provide the metal bellows device 1 smaller than the conventional telescopic cover.

When the pantograph mechanism 12 contracts, the metal bellows 11 is folded. Therefore, unlike the conventional telescopic cover, an extra gap is hardly formed in the expansion and contraction direction. As a result, when the metal bellows device 1 having the same length in the expansion and contraction direction is compared with the telescopic cover, the metal bellows device 1 can extend the moving distance of the table 6 having the processing unit 5 in the expansion and contraction direction. That is, the processing unit 5 can be moved over a wider range than before, and a larger workpiece can be processed.

(2) In this embodiment, the metal bellows 11
Of the hinge member 15 via the support member 21 to the first connection shaft 36 located on the centerline α of the pantograph mechanism 12.
And supported. That is, the pantograph mechanism 12 and the metal bellows 11 expand and contract integrally.
Therefore, since the metal bellows 11 can be smoothly expanded and contracted with the expansion and contraction of the pantograph mechanism 12, the metal bellows device 1 can be expanded and contracted at a high speed.

(3) In this embodiment, the length L1 of the pantograph mechanism 12 at the time of the minimum contraction is set to be longer than the minimum length L2 of the metal bellows 11 at the time of folding. Therefore, at the time of the minimum contraction of the pantograph mechanism 12,
A gap is formed between two adjacent metal bands 14 of the metal bellows 11, so that the two adjacent metal bands 14 do not collide with each other. As a result, the metal bellows 11 can be gently expanded and contracted, so that the metal bellows device 1 can be gently expanded and contracted.

(4) In this embodiment, the metal bellows 11
Was formed of aluminum. Accordingly, since aluminum has high rigidity, the metal band 14 is not deformed by the inertial force generated when the metal bellows device 1 expands and contracts. As a result, the metal bellows 11 can be smoothly expanded and contracted, and the metal bellows device 1 can be expanded and contracted at a high speed.

Further, since the metal band 14 made of aluminum is lightweight, the weight of the metal bellows device 1 can be reduced, and the metal bellows device 1 can be expanded and contracted at a high speed. Further, since the metal band 14 is formed of aluminum, the metal bellows 11 is excellent in water resistance, heat resistance, etc. and has high strength, and prevents hot chips and cutting oil from scattering to the processing unit 5 side. be able to.

(5) In this embodiment, the length of the first bar 32 and the length of the second bar 33 are set to be the same, and
And the length between the axes of the fourth bars 34 and 35 is
(Second bar 33) was set to half the inter-axis length. That is, in the pantograph mechanism 12, two adjacent first
The intervals between the connecting shafts 36 are always equal irrespective of the expansion / contraction state of the pantograph mechanism 12. Therefore, when the pantograph mechanism 12 expands and contracts, the first connecting shafts 36 move at the same speed as each other, and the metal bellows 11 also moves at a constant speed. As a result, the metal bellows 11 can be smoothly expanded and contracted with the expansion and contraction of the pantograph mechanism 12, so that the metal bellows device 1 can be expanded and contracted at a high speed.

(6) In this embodiment, the metal bellows 11
Was formed from two metal metal plates 16 and one coupling plate 17. That is, the width of the metal band 14 in the width direction is longer than when the metal band 14 is formed from only one metal plate 16. Therefore,
In the metal bellows 11, the number of overlapping metal strips 14 can be reduced by increasing the length of each metal strip 14 in the width direction. As a result, the minimum length L3 when the metal bellows 11 is folded when the metal bellows device 1 contracts can be shortened, and the metal bellows device 1 can be downsized.

The embodiment of the present invention may be modified as follows. In the above embodiment, in the metal bellows 11, a pair of fitting grooves 16 a is formed on both sides in the width direction of the metal plate 16, and a pair of projections 15 a as a pair of first protrusions are formed on both sides of the hinge member 15. And the fitting groove 16a is
Although the two metal strips 14 are joined by fitting to the metal strip 5a, the following configuration may be adopted. That is, a pair of first protrusions is formed on both sides in the width direction of the metal plate 16, and a pair of fitting grooves are formed on both sides of the hinge member 15. Then, the two metal strips 14 are joined by fitting the ridge into the fitting groove. In this case, the effects described in (1) to (6) in the embodiment can be obtained.

In the embodiment, a pair of fitting grooves 16a are formed on both sides in the width direction of the metal plate 16 in the metal band 14, and a pair of second protrusions are formed on both sides in the width direction of the coupling plate 17. By forming a ridge 17a as a part and fitting the fitting groove 16a into the ridge 17a,
Although the two metal plates 16 and one coupling plate 17 are connected to form the metal band 14, the following configuration may be adopted. That is, a pair of second protrusions is formed on both sides of the metal plate 16 in the width direction, and a pair of fitting grooves are formed on both sides of the coupling plate 17 in the width direction.
The metal strip 14 is fitted by fitting the ridge into the fitting groove.
To form In this case, the effects described in (1) to (6) in the embodiment can be obtained.

Further, in the above embodiment, the metal band 14
The two metal bands 14 are joined by fitting the hinge member 15 and the hinge member 15 in an uneven relationship, but instead of fitting in the uneven relationship, a bendable hinge is provided between the two metal bands 14. Thus, the two metal strips 14 may be combined. In this case, the effects described in (1) to (6) in the embodiment can be obtained.

Further, in the above embodiment, the metal strip 1
Although 4 is formed of aluminum, the metal band 14 may be formed of a metal other than aluminum, for example, stainless steel.
In such a case, (1) in the above embodiment is used.
In addition to the effects described in (6), an effect is obtained that a metal band having higher strength than a metal band made of aluminum can be obtained.

In the above embodiment, one metal band 14 is formed by a total of three plates, that is, two metal plates 16 and one coupling plate 17, but only one metal plate 16 is formed. The metal band may be formed from. In such a case, (1) to (5) in the above embodiment are used.
In addition to the effects described in (1), the number of parts of the metal bellows can be reduced.

Further, one metal strip 1 is formed by a total of five plates, that is, three metal plates 16 and two coupling plates 17.
4 and four metal plates 16 and three bonding plates 17 for a total of seven metal plates 1
For example, the length of one metal band in the width direction may be increased by forming the metal band 4. In this case, the effects described in (1) to (6) in the embodiment can be obtained.

Further, although the two metal strips 14 are connected to each other by the hinge member 15, a connection structure as shown in FIG. 10 may be used. That is, instead of using an aluminum extruded product as the metal band 14, a pressed product such as stainless steel is used. Then, a connecting body 40 having a fitting groove 40a is fixed to both sides in the width direction of the pressed product by welding or the like. Then, the ridge 15a of the hinge member 15 is fitted into the fitting groove 40a of the connecting body 40. In such a case, in addition to the effects described in (1) to (6) in the above-described embodiment, the manufacturing cost can be reduced because a simpler press working than aluminum extrusion is performed. The effect is obtained.

In the above embodiment, the hinge member 15 is made of synthetic rubber, but the hinge member 15 is made of another material having flexibility instead of synthetic rubber, for example, glass fiber, carbon fiber, etc. May be formed of the above-mentioned reinforcing fibers for composite materials. In this case, the effects described in (1) to (6) in the embodiment can be obtained.

In the above embodiment, the buffer ridge 15d is used as the buffer. However, an intermittent buffer ridge as the buffer may be used instead of the buffer ridge 15d. In such a case, (1) to (1) in the above embodiment are used.
The effect described in (6) is obtained.

Next, technical ideas other than those described in the claims which can be grasped from the embodiment and other examples will be described below together with their effects. (1) The metal bellows device with a pantograph mechanism according to any one of claims 5 to 8, wherein a metal band constituting the metal bellows is formed of aluminum. Therefore, according to the invention described in (1),
Since the metal band made of aluminum is lightweight, the metal bellows device with a pantograph mechanism can be reduced in weight and the metal bellows device with a pantograph mechanism can be expanded and contracted at high speed.

[0054]

As described in detail above, according to the first aspect of the present invention, the metal bellows can be expanded and contracted smoothly, so that the metal bellows can be expanded and contracted at a high speed. Further, the flying objects can be reliably received.

According to the second and third aspects of the present invention, in addition to the effects of the first aspect of the invention, a metal bellows having a simple structure can be provided at low cost. According to the fourth aspect of the invention, in addition to the effects of the first aspect of the invention, a small and inexpensive metal bellows can be provided.

According to the invention described in claim 5, a metal bellows device with a pantograph mechanism smaller than a conventional telescopic cover can be provided. According to the invention as set forth in claim 6, in addition to the effect of the invention as set forth in claim 5, the metal bellows can be smoothly expanded and contracted with the expansion and contraction of the pantograph mechanism. It can be expanded and contracted at high speed.

According to the invention of claim 7, according to claim 5,
Alternatively, in addition to the effect of the invention described in claim 6, since the metal bellows can be extended and contracted gently, the metal bellows device with the pantograph mechanism can be extended and contracted gently.

According to the invention described in claim 8, according to claim 5,
In addition to the effects of the invention described in any one of (1) to (7),
The flying objects can be reliably received.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a machine tool having a metal bellows device.

FIG. 2 is a schematic front sectional view of the same.

FIG. 3 is a plan cross-sectional view of a main part when the metal bellows device is contracted.

FIG. 4 is a rear view when the pantograph mechanism is contracted.

FIG. 5 is a back sectional view of a main part when the pantograph mechanism is contracted.

FIG. 6 is a partially exploded perspective view of the metal bellows.

FIG. 7 is an enlarged plan sectional view of a main part of the metal bellows device.

8A is a partial plan view of the machine tool when the metal bellows device is contracted, and FIG. 8B is a partial plan view of the machine tool when the metal bellows device is extended.

FIG. 9 is a front view when the metal bellows device is extended.

FIG. 10 is a plan view showing another example of the metal band.

FIG. 11 is a schematic plan view showing a conventional telescopic cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal bellows apparatus, 11 ... Metal bellows, 12 ... Pantograph mechanism, 13 ... Machine mounting plate, 14 ... Metal band, 15 ... Hinge member, 15a ... Ridge as 1st protrusion, 16 ... Metal plate, 16a ... fitting grooves as recesses, 17 ... coupling plates, 17a ... ridges as second projections, 21 ... support members, 32 ... first bars constituting bars, 33 ... second bars constituting bars , 34... A third bar constituting a bar, 35... A fourth bar constituting a bar,
36: a first connecting shaft constituting a connecting shaft; 37: a second connecting shaft constituting a connecting shaft; 38: a third connecting shaft constituting a connecting shaft.

Claims (8)

[Claims] A plurality of metal strips (14) are connected to a hinge member (1).
5) A metal bellows, which is connected to each other at 5) to form a corrugated bellows shape. 2. The metal bellows according to claim 1, wherein the metal band (14) and the hinge member (15) are fitted in an uneven relationship. 3. A pair of recesses (16a) are formed on both sides in the width direction of the metal strip (14), and a pair of first protrusions (15a) are formed on the hinge member (15). The metal bellows according to claim 2, wherein the first projection (15a) is fitted into the (16a). 4. The metal plate (16) having a pair of recesses (16a) on both sides in the width direction.
And a coupling plate (17) having a pair of second protrusions (17a) on both sides in the width direction, and one of a pair of recesses (16a) formed in the metal plate (16). 16a) includes a first member of the hinge member (15).
The projection (15a) is fitted, and the second projection (17a) of the coupling plate (17) is fitted into the other recess (16a).
4. The metal bellows according to any one of Items 1 to 3. 5. The metal bellows (11) according to claim 1, a pantograph mechanism (12) for expanding and contracting the metal bellows (11), and the pantograph mechanism (12). A metal bellows device with a pantograph mechanism, comprising: a support member (21) for supporting the metal bellows (11). 6. The pantograph mechanism (12) includes a plurality of bars (32-35) and the plurality of bars (32-35).
And a connecting shaft (36-38) rotatably connecting the two to each other. Of the connecting shafts (36-38), a connecting shaft (36) positioned on a telescopic center line of the pantograph mechanism (12). )
The metal bellows (1) is inserted through the support member (21).
The hinge member (15) of (1) is connected and supported.
5. A metal bellows device with a pantograph mechanism according to item 5. 7. The pantograph mechanism (12) has a length at the time of its minimum contraction that is equal to the length of the metal bellows (1).
The metal bellows device with a pantograph mechanism according to claim 5 or 6, wherein the metal bellows device is longer than the minimum length when folded in 1). 8. A machine mounting plate (13) is attached to both ends of the pantograph mechanism (12) located on the center line of expansion and contraction and to metal bands (14) at both ends of the metal bellows (11). 8. The metal bellows device with a pantograph mechanism according to any one of 5 to 7.