JP2527920C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic cover for covering and protecting a guide surface of a machine such as a machine tool or a three-dimensional measuring machine. The present invention relates to a telescopic cover that enables telescopic movement corresponding to high speed. 2. Description of the Related Art Conventionally, in order to prevent dust or the like from entering a guide surface of a machine, there has been a method of protecting a plurality of large and small cover bodies by covering them with a telescopic cover configured to be telescopically extendable. Has been adopted. [0003] One end of this type of cover is attached to the fixed side end of a guide surface such as a bed,
The other end is attached to the moving body side such as the table body, and the cover is extended and retracted following the movement of the table body on the bed surface. When the cover is extended from a state where the body is sequentially inserted, first, the cover body attached to the table body is pulled out, and the engaging portion provided at the end of the cover body is engaged with the end of the cover body overlapping. Then, the next cover body that overlaps the drawn-out cover body is sequentially pulled out and extended in the same manner.To reduce the cover from the extended state, the table body must be reversed in the above order. It is sequentially retracted into a large cover from the side to reduce it. By the way, the size of the telescopic cover itself has been increased with the recent increase in the size and speed of the machine, and the engagement portions provided at the ends of the respective cover bodies overlapping the large-sized cover as described above. In the case of adopting a configuration in which the members are engaged with each other to sequentially expand and contract, the abutment and engagement of the engaging portions between the cover bodies are performed in an impact manner, which is transmitted to the table body and the processing accuracy of the product. And adversely affect measurement accuracy. Further, since the impact force generated by the abutment / engagement of the engagement portion between the cover members increases substantially in proportion to the square of the speed, the strength, life, breakage and noise of the cover itself are reduced. Also affect. In order to solve the above-described problem, a configuration in which a plurality of large and small cover bodies are connected by a pantograph-type link mechanism has been proposed. (See, for example, Japanese Utility Model Laid-Open Publication No. 51-75686) Problems to be Solved by the Invention However, in a conventional telescopic cover equipped with a pantograph-type link mechanism, each cover body is connected via the link mechanism. Simultaneous start of operation can eliminate shocking movement between each cover body.However, considering the ability to follow the high-speed and agile movement of the table body when the machine becomes larger and faster, Although weight reduction is required, conventional covers equipped with a link mechanism with equal link lengths have a uniform movement amount (movement amount) between the cover bodies regardless of the size of the cover bodies. Since this amount of movement is set in accordance with the size of the smallest end cover body, the distance between the other cover bodies excluding the smallest end cover body at the time of maximum mediation is In this case, it stops in the middle of extension and the overlap length becomes longer, and this portion gives extra weight as a play portion. Further, the load applied to each cover body having a plurality of large and small cover bodies nested therein increases as the inner cover body increases, and the strength of the link mechanism depends on the operation of the cover body subjected to the largest load. Since the setting is taken into consideration, the link mechanism will have more strength than necessary in order to operate other cover bodies except for the cover body where the heaviest load is applied. Giving a great weight. Moreover, the structure is complicated by having a link mechanism on each side of the moving body. The present invention has been made in view of the above points, and an object of the present invention is to provide a telescopic cover in which the cover is rationally lightened and the followability of the table body to a high-speed and agile operation is improved. [0010] Also, even if there are telescopic covers on both sides of the table body,
Another object of the present invention is to provide an inexpensive telescopic cover having a simple configuration by merely providing a pantograph-type link mechanism on only one side. Means for Solving the Problems To achieve the above object, the gist of the first invention of the present invention is to provide a moving body that moves along a guide surface of a machine and a moving body that moves along the guide surface. Between the end portion, a plurality of large and small cover bodies are nested, each cover body is elastically connected by a pantograph link mechanism, and in the telescopic cover that covers the guide surface, the plurality of cover bodies are The closer to the moving body, the more the inside is overlapped, and the length in the direction of expansion and contraction is reduced as the distance to the moving body becomes shorter, and the link mechanism moves the respective link lengths corresponding to the length of the cover body. A second aspect of the present invention resides in a telescopic cover which is gradually elongated from an inner cover body side close to a body, and includes a moving body moving along a guide surface of a machine and the guide. Between the ends, the magnitude plurality of cover members telescopically, each cover Shin contraction freely coupled in telescopic cover for covering the guide surface, telescopic cover on one side of the moving body, the The covers are connected to each other with a pantograph-type link mechanism so that they can expand and contract.
The length in the direction of superimposition and expansion / contraction is shortened as it approaches the moving body, and
The link mechanism approaches the moving body by making each link length correspond to the length of the cover body.
Progressively to elongated from inside the cover side has, telescopic cover on the other side of the moving body, proximate each cover to the movable body
The shorter the distance, the shorter the distance
Telescopic, wherein an intermediate cover body excluding an end cover body adjacent to an end of the moving body and the guide surface is connected to a corresponding intermediate cover body on a link mechanism connecting side via a connecting rod. On the cover. The respective cover members simultaneously start operating via the link mechanism. [0013] Each cover body is overlapped on the inner side as it comes closer to the moving body, and its length in the direction of expansion and contraction is made shorter as it comes closer to the moving body. The length of the cover body is gradually increased from the inner cover body side close to the moving body, and each cover body operates in proportion to the link length. Therefore, the play portion from the actual work is reduced and the weight of the cover itself is reduced. In addition, a larger load is applied to the inner cover body from the side of the cover body that overlaps the upper stack, but the inner cover body has a shorter link length of the link mechanism. Since the operating force applied to the link mechanism operates rationally, the links constituting the link mechanism have the required strength and are reduced in weight. [0015] Accordingly, the lightness of the cover itself and the weight of the link mechanism improve the followability of the table body with respect to the high-speed and agile operation. In the case where a pair of telescopic covers are disposed on both sides of the moving body so as to face each other, the operation of the cover on the side where the link mechanism is mounted is directly transmitted to the other cover via the connecting rod. The cover performs the same reasonable operation. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view of a telescopic cover according to an embodiment of the present invention, in which a link mechanism is reduced, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a vertical sectional side view thereof, and FIG. 5 is a cross-sectional view of FIG. In the figures, A indicates a machine bed, and B indicates a table body that reciprocates on a guide surface of the bed A. Reference numeral 1 denotes a telescopic cover for covering the guide surface of the bed A, which is composed of a plurality of large and small covers 1a, 1b, 1c, 1d nested in a telescopic manner, and is provided with a cover 1a at one inner end. Is attached to the table body B, and the other outer end cover 1d is attached to the bed A. The basic configuration of the cover 1 is well known. Reference numeral 2 denotes a pantograph-type link mechanism in the cover 1 in which the cover bodies 1a, 1b, 1c, and 1d are connected, and links 2a, 2b, and 2c having different lengths are connected. The cross pivot portions 3 of the links 2a, 2b, 2c are connected to the corresponding cover bodies 1a, 1
b, 1c, and 1d are connected to the center of the end. Then, each link 2a, 2b,
The length of 2c, that is, the length from the cross pivot portion 3 to the end of the connecting link is adapted to the size of the corresponding cover body 1a, 1b, 1c, 1d. Therefore,
In this embodiment, the link mechanism 2, that is, the cover 1, overlaps in the most extended state from the smaller inner end attached to the table main body B to the cover body 1 a from the cover body 1 a side. The overlapping lengths of the ends of the cover bodies 1a, 1b, 1c, 1d are set to be the same. In the figure, reference numeral 4 denotes a sliding roller provided on each of the cover members 1a, 1b, 1c, and 1d, for smooth movement of each of the cover members 1a, 1b, 1c, and 1d on the upper surface of the bed A. belongs to. In the above configuration, as the table body B moves on the guide surface of the bed A,
The guide surface of the bed A is covered by the cover 1 that moves. Here, the other cover bodies 1a, 1b, 1c except the outer end cover body 1d attached to the bed A operate (move) at the same time via the link mechanism 2. The amount of movement (strictly, the amount of movement between the overlapping cover bodies) is proportional to the length of each link, that is, the size of each of the cover bodies 1a, 1b, and 1c, that is, in the extension direction of each of the cover bodies 1a, 1b, and 1c. It will be suitable for the length. In addition, a load is applied to the other inner cover bodies 1a, 1b, 1c other than the outer end cover body 1d fixedly attached to the bed A, from the side of the cover bodies that overlap each other in a stacked manner. This load increases as it goes inward, but the link length of the link mechanism 2 connected to each of the cover bodies 1a, 1b, 1c becomes shorter as the inner cover body becomes shorter. The operating force for operating each of the cover bodies 1a, 1b, 1c is strengthened toward the inner cover body, and the cover bodies 1a, 1b, 1c operate in a well-balanced manner. In the embodiment, a configuration is shown in which the cover 5 is symmetrically disposed on the opposite side of the cover 1 with the table body B interposed therebetween. Each cover body 1 a, 1 b, 1 c, 1 d of the cover 1 is connected to the link mechanism 2 as described above.
The other cover 5 connects the intermediate cover members 5b and 5c excluding the two end cover members 5a and 5d to the corresponding intermediate cover members 1b and 1c of the cover 1 via connecting rods 6a and 6b. The cover 1 and the cover 5 are connected to each other so as to perform the contraction operation opposite to each other and operate in the same manner. The connecting rods 6a, 6b are arranged on both left and right sides so that the intermediate cover members 5b, 5c do not twist. As described above, only one link mechanism is provided, the configuration is simplified, and the same effect as the configuration in which the link mechanisms are provided on both sides is obtained. According to the present invention configured as described above, the following effects can be obtained. (1) Each cover body operates in proportion to the link length constituting the link mechanism, and the amount of movement between the cover bodies is adapted to the size of each cover body. In this case, a useless play portion can be eliminated, the weight of the cover itself can be reduced, and the followability of the table body to a high-speed and agile operation can be improved. (2) Since the link length of the link mechanism is shorter in the inner cover body and the operating force is rationally distributed to each cover body via the link mechanism, the link mechanism is manufactured from this surface. In addition, the weight of the table is reduced and the followability of the table body to the high-speed and agile operation is improved. (3) In the case where a pair of covers are disposed opposite to each other on both sides of the movable body, the operation of the link mechanism mounting side cover is transmitted to the other cover as it is via the connecting rod. Operate smoothly and identically to follow the high-speed agile movement of the table body. Further, only one set of the link mechanism is required, which is effective in simplifying the structure and reducing the cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view of a telescopic cover according to an embodiment of the present invention, in which a link mechanism of the telescopic cover is in a contracted state. FIG. 2 is a cross-sectional plan view of the telescopic cover in a state where a link mechanism is reduced. FIG. 3 is a vertical sectional side view of the telescopic cover. FIG. 4 is a longitudinal sectional side view of the telescopic cover in a state where a link mechanism is extended. FIG. 5 is a cross-sectional plan view of the telescopic cover in a state where a link mechanism is extended. [Description of Signs] 1 ... Cover 2 ... Link mechanism 3 ... Cross pivot part 5 ... Cover 6a ... Connecting rod 6b ... Connecting rod A ... Bed B ... Table body

Claims (1)

Claims: 1. A plurality of large and small covers are nested between a moving body moving along a guide surface of a machine and an end of the guide surface, and each cover is a pantograph type. The telescopic cover, which is telescopically connected by the link mechanism and covers the guide surface, wherein the plurality of cover bodies are overlapped inwardly closer to the moving body, and the length in the contraction direction is set to the moving body. A telescopic cover, wherein each link length is gradually increased from an inner cover body side close to the moving body in accordance with a length of the cover body. . Wherein between the mobile and the end portion of the guide surface which moves along the guide surface of the machine, the magnitude plurality of cover members telescopically connected to each cover member Shin contraction freely, the in telescopic cover for covering the guide surface, telescopic cover on one side of the moving body, on the inside as each cover is telescopically connected with pantograph type link mechanism, proximate each cover to the movable body
The length in the direction of superimposition and expansion / contraction is shortened as it approaches the moving body, and
The link mechanism approaches the moving body by making each link length correspond to the length of the cover body.
Progressively to elongated from inside the cover side has, telescopic cover on the other side of the moving body, proximate each cover to the movable body
The shorter the distance, the shorter the distance
Telescopic, wherein an intermediate cover body excluding an end cover body adjacent to an end of the moving body and the guide surface is connected to a corresponding intermediate cover body on a link mechanism connecting side via a connecting rod. cover.