CN212020167U

CN212020167U - Telescopic cover

Info

Publication number: CN212020167U
Application number: CN202020561595.9U
Authority: CN
Inventors: 石川龙太郎
Original assignee: Fanuc Corp
Current assignee: Fanuc Corp
Priority date: 2019-04-25
Filing date: 2020-04-16
Publication date: 2020-11-27
Anticipated expiration: 2030-04-16
Also published as: JP2020179468A; JP7010878B2

Abstract

The utility model provides a scalable lid (1), include: cover sheets (2, 3, 4) which are arranged in one direction in an overlapping manner and are capable of moving relatively along the arrangement direction; and a link mechanism (5) which is one or more and has three links (6, 7, 8) connected in series so as to be swingable about two joint axes (A1, A2) in parallel, and one link mechanism (5) is disposed for each of three adjacent lid pieces (2, 3, 4), each link (6, 7, 8) of the link mechanism (5) being connected to any one of the three adjacent lid pieces (2, 3, 4) so as to be swingable about an axis (B1, B2, B3) parallel to the joint axes (A1, A2), respectively, and in the link mechanism (5), the connection position of each link (6, 7, 8) and the lid piece (2, 3, 4) being set to a position at which the center of the link (6, 7, 8) can be swung in two directions from a state orthogonal to the arrangement direction.

Description

Telescopic cover

Technical Field

The utility model relates to a scalable lid (Telescopic cover).

Background

There is known an extendable cover for covering a linear motion mechanism such as a guide rail or a ball screw exposed in a sliding direction of a slider of a machine tool or the like (for example, see patent document 1).

This scalable lid includes: a plurality of sections of cover plates; and a plurality of segments of a plurality of power receiving arcuate-shaped parallel links that move in synchronization with the cover plate.

Such a synchronization mechanism is particularly required under the use condition that the retractable cover is retracted and extended at high speed.

Documents of the prior art

Patent document

Patent document 1: japanese Kokai publication Hei-5-26244

SUMMERY OF THE UTILITY MODEL

Problem to be solved by the utility model

In the multiple parallel links of the pantograph shape, since the links operate while maintaining the rhombic shape for each segment, it is difficult to secure a large stroke with respect to the lateral width. Therefore, in the case where there is a size limitation on the lateral width of the retractable cover, it is necessary to increase the number of stages of the retractable cover and the multiple parallel links. However, an increase in the number of stages leads to an increase in cost and a decrease in reliability due to an increase in the number of parts. Therefore, a retractable cover capable of covering a linear motion mechanism having a large stroke with a smaller number of stages is desired.

Means for solving the problems

An aspect of the utility model is a scalable lid, include: cover plates which are arranged in one direction in an overlapping manner and are capable of moving relatively in the arrangement direction; and a link mechanism that is one or more and has three links connected in series so as to be swingable about two joint shafts in parallel, and one link mechanism is disposed for each three adjacent lid pieces, wherein each of the links of the link mechanism is connected to any one of the three adjacent lid pieces so as to be swingable about an axis parallel to the joint shafts, and in the link mechanism, a connection position of each of the links and the lid piece is set at: the link at the center is at a position capable of swinging in two directions from a state orthogonal to the arrangement direction.

Drawings

Fig. 1 is a perspective view showing an example of a stage having a retractable cover according to an embodiment of the present invention.

Fig. 2 is a perspective view illustrating the retractable cover of fig. 1.

Fig. 3 is a plan view showing a state in which the retractable cover of fig. 2 is maximally extended.

Fig. 4 is a plan view showing a state where the retractable cover link mechanism of fig. 2 has a maximum width dimension.

Fig. 5 is a plan view showing a state where the retractable cover of fig. 2 is maximally retracted.

Fig. 6 is a perspective view showing a modification of the retractable cover of fig. 2.

Fig. 7 is a plan view showing a state where the retractable cover of fig. 6 is maximally extended.

Fig. 8 is a plan view showing a state where the link mechanism has a maximum width dimension in the retractable cover of fig. 6.

Fig. 9 is a plan view showing a state where the retractable cover of fig. 6 is maximally retracted.

Fig. 10 is a perspective view showing another modification of the retractable cover of fig. 2.

Detailed Description

Next, a retractable cover 1 according to an embodiment of the present invention will be described with reference to the drawings.

As shown in fig. 1, the retractable cover 1 according to the present embodiment is provided on, for example, a stage 100 provided in a machine tool. The stage 100 includes: a base not shown; a slider 110 on which a workpiece or the like is mounted; and a linear motion mechanism, not shown, for supporting the slider 110 to be slidable in one direction with respect to the base. The retractable covers 1 are disposed on both sides of the slider 110 in the sliding direction, and cover the linear motion mechanism to prevent the linear motion mechanism from being exposed to the outside.

As shown in fig. 2 to 5, each retractable cover 1 includes: three

cover sheets

2, 3, 4 arranged in the sliding direction of the slider 110, and a link mechanism 5 connecting these

cover sheets

2, 3, 4.

The

cover sheets

2, 3, 4 comprise: a first cover sheet 2 fixed to the slider 110; a third cover sheet 4 fixed to the base; and a second cover sheet 3 disposed between the first cover sheet 2 and the third cover sheet 4.

The second cover sheet 3 is smaller than the first cover sheet 2 and is arranged to partially overlap the first cover sheet 2 in the sliding direction, and the second cover sheet 3 can relatively move in the sliding direction with respect to the first cover sheet 2 while maintaining a state of being partially housed inside the first cover sheet 2.

The third cover sheet 4 is smaller than the second cover sheet 3 and is arranged to partially overlap the second cover sheet 3 in the sliding direction, and the third cover sheet 4 can relatively move in the sliding direction with respect to the second cover sheet 3 while maintaining a state of being partially housed inside the second cover sheet 3.

The link mechanism 5 includes a first link (link) 6, a second link (link) 7, and a third link (link) 8, which are formed in a straight bar shape, respectively. One end of the first link 6 is connected to one end of the second link 7 so as to be swingable about a first joint axis (joint axis) a1, and the other end of the second link 7 is connected to one end of the third link 8 so as to be swingable about a second joint axis (joint axis) a2 parallel to the first joint axis a 1.

The other end of the first link 6 is rotatably attached to the first lid plate 2 by a first shaft 9 about a first axis (axis) B1 parallel to the first joint shaft a1 and the second joint shaft a 2. The second link 7 is rotatably attached to the second lid plate 3 at its center position via a second shaft 10 about a second axis (axis) B2 parallel to the first joint shaft a1 and the second joint shaft a 2. The other end of the third link 8 is rotatably attached to the third lid plate 4 by the third shaft 11 about a third axis (axis line) B3 parallel to the first joint shaft a1 and the second joint shaft a 2.

In the present embodiment, the retractable cover 1 operates between a state in which the three

cover pieces

2, 3, 4 are maximally expanded as shown in fig. 3 and a state in which the three

cover pieces

2, 3, 4 are maximally overlapped as shown in fig. 5. As shown in fig. 4, the second link 7 is swung in the opposite direction in the state shown in fig. 3 and 5, with reference to the direction orthogonal to the sliding direction, that is, the state arranged in the width direction of the second lid plate 3.

In other words, in the present embodiment, the coupling positions at which the first to

third links

6, 7, 8 of the link mechanism 5 are coupled to the first to

third lid pieces

2, 3, 4 are set to positions that can be swung in two directions based on the state in which the second link 7 is arranged in the width direction. Specifically, the attachment position of the first link 6 to the first lid plate 2 and the attachment position of the third link 8 to the third lid plate 4 are respectively arranged at positions offset in opposite directions from the center in the width direction. In the state of fig. 3, the first link 6, the second link 7, and the third link 8 are set at positions not aligned on a straight line.

In fig. 3 and 5, when the length of the second link 7 is L and the angle formed by the second link 7 and the sliding direction is θ, the maximum lateral width dimension of the link mechanism 5 is equal to the length dimension L of the second link 7 in the state shown in fig. 4. Further, the stroke of the link mechanism 5 is 2Lcos θ. Therefore, the lateral width ratio of the stroke is 2cos θ.

In contrast, in the conventional multiple parallel links of the pantograph shape, if the

links

6, 7, and 8 can be arranged in a posture along the width direction in the most contracted state, the stroke width ratio in the lateral direction is 2cos θ. However, in practice, in order to avoid interference between the

adjacent shafts

9, 10, 11, the

links

6, 7, 8 cannot be arranged in the width direction, and the lateral width ratio of the stroke is less than 2cos θ.

That is, according to the retractable cover 1 of the present embodiment, in the state shown in fig. 3, when a force acts in a direction in which the first cover sheet 2 and the third cover sheet 4 are brought close to each other, the force applied to the first cover sheet 2 acts on the first link 6 via the first shaft 9. Further, the force applied to the third lid plate 4 acts on the third link 8 via the third shaft 11.

Then, the force transmitted in the longitudinal direction of the first link 6 and the third link 8 acts on the first joint axis a1 and the second joint axis a2 at both ends of the second link 7. Thus, in fig. 3, even force acts on the second link 7, and the second link 7 swings counterclockwise about the second axis B2 with respect to the second lid plate 3.

When the second link 7 swings, the overlapping area of the first and

second cover sheets

2 and 3 and the second and

third cover sheets

3 and 4 increases, and the entire length of the retractable cover 1 is shortened. As shown in fig. 4, the link mechanism 5 has the largest lateral width dimension at the position where the second link 7 extends in the width direction. By further swinging the second link 7, the overlapping area of the first and

second lid pieces

2 and 3 and the second and

third lid pieces

3 and 4 is increased, and the entire length of the retractable lid 1 is shortened to the minimum length of fig. 5.

On the contrary, in the state shown in fig. 5, when a force acts in a direction of separating the first and

third cover sheets

2 and 4 from each other, the second link 7 swings in a direction opposite to the above direction and is extended to the maximum length shown in fig. 3 through the state of fig. 4.

Since the three

cover sheets

2, 3, and 4 are synchronously operated by the link mechanism 5, even if the slider 110 is operated at a high speed, an excessive force is not applied to the three

cover sheets

2, 3, and 4, and the three cover sheets can be smoothly and synchronously operated.

In this case, the retractable cover 1 according to the present embodiment has the following advantages: by providing the link mechanism 5 that swings the second link 7 across a wide angular range, the width of the link mechanism 5 can be suppressed and a long stroke can be ensured.

In addition, the following advantages are provided: the number of

links

6, 7, and 8 constituting the link mechanism 5 is small, and the number of parts can be reduced to suppress cost.

In the present embodiment, the case where the retractable cover 1 has three

cover pieces

2, 3, and 4 is exemplified, but the present invention is not limited thereto, and four

cover pieces

2, 3, 4, and 12 may be provided. In this case, the link mechanisms (first link mechanism, second link mechanism) 5 may be prepared one by one so that one link mechanism is prepared for each of the three

adjacent cover sheets

2, 3, 4, 12.

That is, as shown in fig. 6 to 9, one link mechanism 5 may be disposed for the first to third cover sheets 2 to 4, and the other link mechanism 5 may be disposed for the second to fourth cover sheets (cover sheets) 3 to 12. This enables all the

cover sheets

2, 3, 4, and 12 to operate synchronously and smoothly.

In the retractable cover 1 according to the present embodiment, the

cover pieces

2, 3, 4, 12 and the link mechanism 5 are added in the same number, so that all the

cover pieces

2, 3, 4, 12 can be operated synchronously and smoothly even when five

cover pieces

2, 3, 4, 12 are provided. There is no upper limit on the number of

flaps

2, 3, 4, 12, and the number of linkages 5 is two less than the number of

flaps

2, 3, 4, 12.

In this case, the adjacent first link mechanism (link mechanism) 5 and second link mechanism (link mechanism) 5 are configured to: of the adjacent first, second, and

third lid pieces

2, 3, and 4 in which the first link mechanism 5 is arranged and the adjacent second, third, and

fourth lid pieces

3, 4, and 12 in which the second link mechanism 5 is arranged, the adjacent two

lid pieces

3 and 4 are common lid pieces, and the first lid piece 2 and the fourth lid piece 12 are different lid pieces.

Likewise, the adjacent second and

third link mechanisms

5 and 5 are configured to: of the adjacent second, third and

fourth lid pieces

3, 4 and 12 in which the second link mechanism 5 is arranged and the adjacent third, fourth and

fifth lid pieces

4, 12 in which the third link mechanism 5 is arranged, the adjacent two

lid pieces

4 and 12 are common lid pieces, and the second lid piece 3 and the fifth lid piece are different lid pieces.

Further, as shown in fig. 10, a plurality of link mechanisms 5 may be disposed at intervals in the width direction of the cover sheet. That is, a plurality of link mechanisms 5 may be provided to the three

cover plates

2, 3, 4. Thus, the two link mechanisms 5 operate in synchronization, and therefore, have the following advantages: rotation of

lid sheets

2, 3, 4 about axes B1, B2, B3 orthogonal to both the sliding direction and the width direction can be suppressed, and meandering and inclination of

lid sheets

2, 3, 4 can be prevented.

Description of the reference numerals

1: telescopic cover

2: first cover (cover)

3: second cover (cover)

4: third cover (cover)

5: link mechanism (first link mechanism, second link mechanism)

6: first connecting rod (connecting rod)

7: second connecting rod (connecting rod)

8: third connecting rod (connecting rod)

12: fourth cover (cover)

A1: first joint axis (Joint axis)

A2: second joint axis (Joint axis)

B1: first axis (Axis)

B2: second axis (Axis)

B3: third axis (axis).

Claims

1. A retractable cover, comprising:

cover plates which are arranged in one direction in an overlapping manner and are capable of moving relatively in the arrangement direction; and

a link mechanism which is one or more than one and has three links connected in series so as to be swingable about two joint axes in parallel, and one link mechanism is disposed for each three adjacent cover plates,

each link of the link mechanism is connected to any one of the three adjacent cover plates so as to be capable of swinging about an axis parallel to the joint shaft,

in the link mechanism, a coupling position of each link and the cover plate is set at a position at which the center link can be swung in two directions from a state orthogonal to the arrangement direction.

2. The retractable cover of claim 1,

the three cover plates are a first cover plate, a second cover plate and a third cover plate which are sequentially arranged along the arrangement direction,

the three connecting rods are a first connecting rod connected with the first cover plate, a second connecting rod connected with the second cover plate and a third connecting rod connected with the third cover plate,

one end of the first connecting rod is connected with one end of the second connecting rod, the other end of the first connecting rod is connected with the first cover plate,

the second link is coupled at a center thereof to the second cover plate,

one end of the third connecting rod is connected with the other end of the second connecting rod, and the other end of the third connecting rod is connected with the third cover plate.

3. The retractable cover of claim 1,

the more than three cover plates are a first cover plate, a second cover plate, a third cover plate and a fourth cover plate which are sequentially arranged along the arrangement direction,

more than one link mechanism is a first link mechanism and a second link mechanism,

the three connecting rods of the first link mechanism are: a first link coupled to the first cover plate, a second link coupled to the second cover plate, and a third link coupled to the third cover plate,

the three links of the second link mechanism are: a first link coupled to the second cover plate, a second link coupled to the third cover plate, and a third link coupled to the fourth cover plate.

4. The retractable cover of claim 1,

the number of the cover sheets is more than five,

the number of the link mechanisms is two less than that of the cover plates,

the position relation of each link mechanism is as follows: in each of the adjacent link mechanisms, of the three adjacent cover plates in which one link mechanism is disposed and the three adjacent cover plates in which the other link mechanisms are disposed, two adjacent cover plates are made to be a common cover plate, and one cover plate is made to be a different cover plate.

5. The retractable cover of any one of claims 1 to 4,

more than two link mechanisms are arranged in parallel on every three adjacent cover plates.