JP2004130437A - Telescopic cover device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic cover device with improved durability capable of surely and inexpensively achieving a requirement on movement of high speed/high acceleration and deceleration for a movable cover forming a telescopic structure, preventing the generation of mechanical impact/noise. <P>SOLUTION: A plurality of the movable covers 9, 10 are relatively movably provided in a nested state between a projecting cover 7 fitted to a column 3 supporting a spindle head 2 and a fixed cover 8 erected from a prescribed position on a base. A male screw bar 11 rotationally driven by driving force of a servo motor 18 for the cover is horizontally disposed at the rear side of the column 3, and is provided with a male thread part 12a with a large pitch and a male thread part 13a with a small pitch. Each of the movable covers 9, 10 and each of the male thread parts 12a, 13a are connected thorough female screw bodies 14, 15 or the like so as to individually correspond to each other. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a telescopic cover device provided at a boundary where spatial separation and cutoff is required, such as a boundary between a cutting area and a machine component area of a machine tool, so as to be extendable and contractable along the boundary. .
[0002]
[Prior art]
Generally, in a machine tool, a spindle head, which is a moving member, is equipped with a tool and is moved by a drive mechanism in a direction (X-axis direction, Y-axis direction) intersecting the axial direction (Z-axis direction) of the spindle head. At the position, the workpiece moves forward and backward in the axial direction (Z-axis direction) to perform cutting or the like on the work surface. The drive mechanism is normally operatively connected to the rear surface side of the spindle head, and its mechanical configuration includes a power transmission mechanism such as a guide member for guiding the movement direction of the spindle head when the spindle head moves and a meshing gear. In. And, since these drive mechanisms are for accurately positioning the spindle head at the time of work processing, cutting chips generated by cutting the work surface or the like do not enter the mechanical components of the drive mechanism. You need to do that.
[0003]
Therefore, in order to respond to such a demand, conventionally, a plurality of movable covers (hereinafter, referred to as a “movement cover”, hereinafter) are provided at a boundary between a cutting area in which the spindle head moves and a mechanical configuration area of the drive mechanism so as to separate and block both areas. A telescopic cover device is provided in which a telescopic cover device is combined to form a telescopic structure. As such a telescopic cover device, a type in which adjacent covers are sequentially hung or abutted and moved together when the entire cover expands and contracts is conventionally known. However, there is a problem in that mechanical shock and noise are generated by hooking or abutting during the expansion and contraction.
[0004]
Then, in order to solve such a problem, recently, a telescopic cover device as described in Patent Document 1, for example, has been proposed. In other words, in the device described in this publication, a toothed drive belt or the like that travels and moves in a circulating manner is used as a drive source, and each movable cover is moved by a driving force so that a separately set movable stroke range is set to another movable cover adjacent thereto. Move at different speeds. As a configuration for that purpose, in the device described in the above publication, a reduction gear having a dual-shaft structure having an input pinion and an output pinion is provided for each movable cover, and the reduction ratio of the reduction gear between adjacent movable covers is set to be equal. The difference made the moving speed different. The above-mentioned publication also discloses a telescopic cover device in which a linear motor is individually installed as a drive source for each movable cover, and the movable cover is self-propelled at a predetermined speed difference to extend / overlap each movable cover. ing.
[0005]
[Patent Document 1]
JP-A-8-192332 (Claims 1, Claims 6, FIGS. 1 to 8)
[0006]
[Problems to be solved by the invention]
However, since the speed reducer and the linear motor are devices having complicated configurations, there is a problem that the cost of the telescopic cover device is increased accordingly. Further, the speed reducer and the linear motor are devices having a large number of precision parts, and since they are moved at high speed and high acceleration / deceleration, there is a problem that the durability of the device is poor.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to meet the demand for high-speed, high-acceleration and deceleration of the movement of each movable cover forming a telescopic structure by reducing the generation of mechanical shock and noise. An object of the present invention is to provide a telescopic cover device which can be reliably realized at a low cost while preventing the problem, and has improved durability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a moving member is provided along a boundary between a first area and a second area adjacent to the first area. A plurality of telescopic structures, each of which moves along the boundary line based on the driving force of the driving mechanism housed in the other area of the two areas when moving while partially facing one of the areas. In a telescopic cover device having a movable cover, the driving mechanism is provided with a driving body that is driven in a predetermined direction, and the driving body is provided with a plurality of moving guides so as to individually correspond to the movable covers, The gist of the present invention is that a linking means is provided between each of the moving guides and each of the movable covers for connecting and engaging the individually corresponding moving guide and the movable cover.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, the driving body is a rotating member that is driven to rotate about an axis along the boundary direction, and a peripheral surface of the rotating member has The gist is that each of the moving guides is formed in a spiral shape with a predetermined pitch width.
[0010]
According to a third aspect of the present invention, in the second aspect of the present invention, the helical pitch width of each of the moving guide portions is set to the moving member when each of the movable covers is in an extended state of a telescopic structure. The gist is that the pitch width of the moving guide portion corresponding to the near movable cover is larger than the pitch width of the moving guide portion corresponding to the movable cover far from the moving member.
[0011]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the moving guide amount per unit driving time of the driving body in each of the moving guide sections is equal to The gist is that the movement guide portion is proportional to the movement stroke width of each corresponding movable cover.
[0012]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the driving mechanism drives a driving source for moving a moving member and the driving body. And that the two driving sources are operated synchronously.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a telescopic cover device of a machine tool that performs cutting of a workpiece or the like will be described with reference to FIGS. 1 and 2.
[0014]
As shown in FIGS. 1 and 2, a machine tool 1 according to the present embodiment supports a spindle head 2 as a moving member so as to be vertically movable and moves in a horizontal direction (a left-right direction in FIG. 1, the same applies hereinafter). A reciprocating column 3 is provided. As shown in FIG. 1, a female screw body 4 is attached to a lower portion of the column 3, and the female screw body 4 has a male screw part 5a on a male screw rod 5 rotatable around an axis extending in the horizontal direction. It is screwed. The spindle head 2 is moved in a horizontal direction together with the column 3 by rotating a spindle head servo motor 6 as a drive source operatively connected to one end of the male screw rod 5.
[0015]
A pair of overhanging covers 7 are mounted on the front surface of the column 3 on which the spindle head 2 is supported, at positions symmetrical with respect to the spindle head 2. As shown in FIG. 2, the left and right overhanging covers 7 include a cutting area (first area) E1 in which the spindle head 2 moves substantially facing the entirety thereof, the male screw bar 5 and a spindle head servo. It is located on a boundary line L that partitions off a mechanical configuration area (second area) E2 in which the motor 6 and the like are accommodated. The mechanical configuration of the male screw 5 and the spindle head servomotor 6 is not shown in FIG.
[0016]
As shown in FIGS. 1 and 2, a pair of fixed covers 8 is provided on the machine tool 1 at each position further outward by a predetermined distance from each horizontal end position of the spindle head 2 in the horizontal direction. Not erected on a base. The left and right fixed covers 8 have an L-shape in plan view as can be understood from FIGS. 1 and 2, and a rear end portion thereof is located in the machine configuration area E2, while a front end portion thereof is formed in the cutting area. The arrangement configuration is located at E1. A plurality of (two in this embodiment, two on the left and right sides of the spindle head 2) plate-shaped movable covers 9 and 10 are provided between the fixed cover 8 and the overhanging cover 7 along the boundary line L. It is provided movably.
[0017]
That is, the movable covers 9 and 10 are configured to be nested relative to each other between the overhanging cover 7 and the fixed cover 8. With the movement of the spindle head 2, the telescopic structure is extended (the relative position of the covers 7 to 10 on the right side of the spindle head 2 in FIG. 2) and overlapped (the left side of the spindle head 2 in FIG. 2). (The relative position state of each of the covers 7 to 10).
[0018]
Next, a drive mechanism of the movable covers 9 and 10 will be described. As shown in FIGS. 1 and 2, a single driving body and a male screw rod 11 as a rotating member are rotatably mounted in a direction along the boundary line L above the mechanical configuration area E2. . The male screw rod 11 has a large-diameter cylindrical portion 12 at the center in the length direction, and a small-diameter cylindrical portion 13 at both ends in the length direction. Male screw portions 12a and 13a are formed on the peripheral surfaces of the cylindrical portions 12 and 13 as spiral moving guide portions. The pitch width of the male screw portions 12a and 13a as the movement guide amount is such that the pitch width of the male screw portion 12a is larger than the pitch width of the male screw portion 13a.
[0019]
Incidentally, in this embodiment, the pitch width of the male screw portion 12a of the male screw bar 11 is set to 35 mm, and the pitch width of the male screw portion 13a is set to 15 mm. The pitch width of the male screw portion 5a of the male screw bar 5 is set to 60 mm. When the spindle head 2 moves from one moving end position to the other moving end position, the moving stroke width is 600 mm for the spindle head 2, 350 mm for the movable cover 9, and 350 mm for the movable cover 9. Is set to 150 mm.
[0020]
Female screw bodies 14 and 15 having a ball screw structure are respectively screwed to the cylindrical portions 12 and 13 so as to correspond to the male screw portions 12a and 13a, respectively. Further, a connection member 16 connects between the female screw member 14 and the movable cover 9, and a connection member 17 connects between the female screw member 15 and the movable cover 10. In the present embodiment, the female screw members 14 and 15 and the connecting members 16 and 17 constitute linking means. Note that a male screw rod 11A having the same configuration as the male screw rod 11 is provided below the machine component area E2 in a direction along the boundary line L. Female screw bodies 14 and 15 are also screwed into the cylindrical portions 12 and 13 of the male screw rod 11A, respectively, and a connection member 16 is provided between the female screw bodies 14 and 15 and the movable covers 9 and 10. , 17 are connected.
[0021]
A cover servomotor 18 as a drive source is operatively connected to one end (the right end in FIGS. 1 and 2) of the male screw rod 11 located on the upper side of the two male screw rods 11 and 11A. . A timing belt 20 is mounted between the timing pulleys 19 provided near one ends of the male screw rods 11 and 11A, respectively. When the cover servomotor 18 rotates, the male screw rods 11 and 11A are rotated. , 11A are synchronously driven to rotate.
[0022]
The cover servomotor 18 is connected to a numerical control (NC) arithmetic unit 22 via a servomotor adjustment unit 21. The spindle head servomotor 6 is connected to the numerical control (NC) arithmetic unit 22 via a servomotor adjusting unit 23. The servo motors 6 and 18 are configured to operate synchronously based on control signals input from the numerical control (NC) arithmetic unit 22 via the servo motor adjustment units 21 and 23, respectively. .
[0023]
In FIG. 1, the drive mechanisms (male screw rods 11, 11 </ b> A, etc.) of the movable covers 9, 10 are located above and below the upper and lower edges of the covers 7 to 10 when viewed from the front of the machine tool 1. The contents of each figure are exposed. However, in order to clearly show the individually corresponding relationship between each movable cover 9, 10 and each male screw portion 12a, 13a serving as a movement guide portion, it is intentionally pulled up and down on the upper edge and the lower edge of each cover 7-10. The drive mechanism such as the male screw rod 11 is actually hidden behind the covers 7 to 10.
[0024]
Next, an operation of the telescopic cover device in the machine tool 1 according to the embodiment configured as described above will be described.
FIG. 2 shows that the movable covers 9 and 10 on the left side of the spindle head 2 are in the overlapping state at one moving end position and the movable covers 9 and 10 on the right side of the spindle head 2 are in the extended state. It is shown that. Therefore, a case where the spindle head 2 moves rightward toward the other moving end position from this state will be described below.
[0025]
First, a rotation drive signal is output from the numerical control (NC) arithmetic unit 22 to the spindle head servomotor 6 via the servomotor adjustment unit 23. At this time, the numerical control (NC) arithmetic unit 22 simultaneously outputs a rotation drive signal via the servo motor adjustment unit 21 to the cover servo motor 18. Each of the rotation drive signals is a command signal for rotating the spindle head servomotor 6 and the cover servomotor 18 at the same rotation speed (for example, 3000 rotations / minute).
[0026]
Then, the spindle head servomotor 6 and the cover servomotor 18 start to rotate, respectively, based on the rotation drive signals. Then, based on the driving force of the spindle head servomotor 6, the male screw rod 5 rotates clockwise as viewed from the spindle head servomotor 6 side. Further, based on the driving force of the cover servomotor 18, the male screw rod 11 located on the upper side rotates counterclockwise as viewed from the cover servomotor 18 side in synchronization with the rotation of the male screw rod 5. The rotational driving force of the male screw rod 11 located on the upper side is transmitted to the male screw rod 11A located on the lower side via the timing pulley 19 and the timing belt 20 provided on the both male screw rods 11 and 11A. . Therefore, both male screw rods 11 and 11A located on the upper and lower sides rotate in the counterclockwise direction in synchronization with the rotation of the male screw rod 5 in the clockwise direction.
[0027]
Next, when the male screw rod 5 is driven to rotate, the female screw body 4 screwed into the spiral male screw part 5a formed on the peripheral surface of the male screw rod 5 is shown in FIG. 1 or FIG. Starts moving to the right. Accordingly, with the movement of the female screw body 4, the column 3, the spindle head 2 and the overhanging cover 7 also move to the right. At this time, assuming that the male screw rod 5 is driven to rotate at 3000 rotations / minute, the movement amount of the male screw part 5a whose pitch width is set to 60 mm is 180 m / minute, and the spindle head 2 is The movement of 600 mm, which is the movement stroke width of 2, is completed in 0.2 seconds.
[0028]
On the other hand, when the two male screw rods 11 are rotationally driven in synchronization with the rotational driving of the male screw rod 5, the helical male screws formed on the cylindrical portions 12, 13 of the male screw rods 11, 11A are formed. Each of the female screw bodies 14 and 15 screwed to the portions 12a and 13a simultaneously starts moving to the right in FIG. Accordingly, the movable covers 9 and 10 connected to the female screw bodies 14 and 15 via the connecting members 16 and 17 also move rightward with the movement of the female screw bodies 14 and 15. At this time, similarly to the case of the male screw rod 5, both the male screw rods 11 and 11A are driven to rotate at 3000 rotations / minute.
[0029]
Therefore, in this case, the moving amount by the male screw portion 12a whose pitch width is set to 35 mm is 105 m / min, and the movable cover 9 moves by 350 seconds which is the moving stroke width of the movable cover 9 in 0.2 seconds. Will be completed. Further, the moving amount by the male screw portion 13a whose pitch width is set to 15 mm is 45 m / min, and the movable cover 10 completes the movement of 150 mm which is the moving stroke width of the movable cover 10 in 0.2 seconds. Become. With the completion of the movement, the movable covers 9 and 10 on the left side of the spindle head 2 are in the extended state, and the movable covers 9 and 10 on the right side of the spindle head 2 are in the extended state. It is in a state of being superimposed at the moving end position.
[0030]
As described above, when the spindle head servomotor 6 and the cover servomotor 18 are driven to rotate at the same rotation speed (for example, 3000 rotations / minute) based on the rotation drive signal from the numerical control (NC) calculation device 22. The spindle head 2 and the movable covers 9 and 10 start moving at the same time and stop moving at the same time. In other words, the movable covers 9 and 10 move at the same time at different moving speeds (moving modes) with the moving stroke widths set for the respective movable covers 9 and 10. The actual movement stroke width with respect to the spindle head 2 and the like is calculated by the numerical control (NC) calculation device 22 as necessary, and the rotation drive time is adjusted by the rotation drive signal.
[0031]
Contrary to the above description, when the spindle head 2 translates from right to left in FIG. 2, the spindle head servomotor 6 and the spindle head servo motor 6 based on the rotation drive signal from the numerical control (NC) arithmetic unit 22. The cover servomotor 18 is driven to rotate in the direction opposite to that described above. Then, by the same driving principle as described above, the spindle head 2 and the movable covers 9 and 10 start moving from the right side to the left side at the same time, and stop moving at the same time.
[0032]
Therefore, according to the telescopic cover device of the machine tool 1 of the above embodiment, the following features can be obtained.
(1) In the above-described embodiment, the driving body for moving each movable cover 9, 10 is constituted by the male screw rod 11, and a plurality of male screw parts (movement guide parts) 12 a, 13 a are moved to the male screw rod 11. The movable covers 9 and 10 are provided so as to individually correspond to the movable covers 9 and 10 with a difference in the pitch width serving as the guide amount. Then, the individually corresponding movable covers 9 and 10 and the male screw portions 12a and 13a are connected via the female screw members 14 and 15 and the connecting members 16 and 17 as linking means, and when the male screw rod 11 is driven to rotate. The movable covers 9, 10 together with the female screw bodies 14, 15 and the like are configured to move in a predetermined direction with a difference in their movement manner. Therefore, unlike the conventional case, since a speed reducer or a linear motor having a complicated and many precision components is not provided for each of the movable covers 9 and 10, the movement of each of the movable covers 9 and 10 can be accelerated and accelerated / decelerated. This can be reliably realized at a low cost while preventing the generation of mechanical impact and noise, and the durability can be improved.
[0033]
(2) In the above embodiment, the driving body is constituted by the male screw rod 11 which is a rotating member which is driven to rotate about the axis along the boundary line L direction. 13a constitutes the movement guide section. Therefore, since the driving body provided in the driving mechanism for moving each of the movable covers 9 and 10 has a simple configuration of the male screw rod 11 serving as a rotating member, the apparatus cost is further reduced and the durability is further improved. Can be planned.
[0034]
(3) In the above embodiment, when the movable covers 9 and 10 are in the extended state, the pitch width of the male screw portion 12a individually corresponding to the movable cover 9 closer to the spindle head (moving member) 2 is determined. The pitch width is larger than the pitch width of the male screw portion 13a individually corresponding to the movable cover 10 on the side remote from the spindle head 2. That is, the helical pitch widths of the male screw portions 12a and 13a were configured to be 35 mm and 15 mm, respectively. Therefore, when each of the movable covers 9 and 10 moves between the extended state and the overlapped state, the movable cover 10 that is farther from the spindle head 2 having a larger moving stroke width is set to have a smaller moving stroke. The movable cover 9 can be moved without delay in comparison with the movable cover 9 on the side closer to the spindle head 2.
[0035]
(4) In the above embodiment, the movement guide amount (pitch width) per unit drive time of the male screw rod 11 in each of the male screw portions 12a and 13a is proportional to the movement stroke width of each of the movable covers 9 and 10 at 350 mm and 150 mm. The configuration has a relationship. Accordingly, the time required from the start of the movement of each of the movable covers 9, 10 to the completion of the movement is the same, and the movable covers 9, 10 can be operated synchronously. When it is desired to adjust the moving speed of each of the movable covers 9 and 10, it can be easily achieved by adjusting the rotation speed of the male screw rod 11.
[0036]
(5) In the above embodiment, a cover servomotor 18 for moving the movable covers 9 and 10 is provided separately from the spindle head servomotor 6 which is the drive source of the spindle head 2. 18 was operated synchronously. Therefore, even if movement resistance occurs in the movable covers 9 and 10 due to, for example, biting of cutting chips, the movement resistance does not become the movement resistance of the spindle head 2, and the processing accuracy in the machine tool 1 is reduced. Has no adverse effect.
[0037]
The above embodiment may be modified as follows.
In the above-described embodiment, the male screw rod 11 serving as a driving body is rotationally driven by one cover servo motor 18, and the rotational force is transmitted to another male screw rod 11A serving as a driving body via the timing belt 20 and the like. Was like that. However, two servo motors 18 for the cover may be provided, and one of the servo motors 18 drives the male screw rod 11 to rotate, and the other servo motor 18 drives the male screw rod 11A to rotate.
[0038]
In the above embodiment, the driving source (the servomotor 6 for the spindle head) for moving the spindle head 2 as the moving member and the driving source (the servomotor 18 for the cover) for driving the male screw rod 11 as the driving body. ) And were separately provided. However, a configuration may be adopted in which one drive source (for example, a servomotor or the like) serves as both the drive source for moving the spindle head 2 and the drive source for rotating the male screw rod 11.
[0039]
-In the above-mentioned embodiment, the pitch width of each male screw part 12a and 13a in male screw rod 11 was set to 35 mm and 15 mm, respectively. However, if the pitch width of each of the male screw portions 12a, 13a is proportional to the moving stroke width (350 mm, 150 mm) of the individually corresponding movable cover 9, 10, it is set to, for example, 70 mm, 30 mm. It is not limited to the pitch width (35 mm, 15 mm) in the above embodiment.
[0040]
In the above embodiment, the pitch width (35 mm, 15 mm) of each of the male screw portions 12 a, 13 a is configured to be proportional to the moving stroke width (350 mm, 150 mm) of the corresponding movable cover 9, 10. . However, when the movable covers 9 and 10 are in the extended state, the pitch width of the male screw portion 12a corresponding to the movable cover 9 on the side closer to the spindle head 2 is larger than the pitch width of the movable cover 10 on the side farther from the spindle head 2. It is sufficient that the pitch width is larger than the pitch width of the corresponding male screw portion 13a, and it is not always necessary to have the proportional relationship.
[0041]
In the above embodiment, the driving body is constituted by one male screw rod 11, and the pitch width of each of the male screw portions 12a and 13a in the single male screw rod 11 is 35 mm and 15 mm, respectively. Was set. However, the driving body is constituted by a plurality of (for example, two) male screw rods 11 and 11A, and the male screw part (movement guide part) formed on one male screw rod 11 is made to correspond to one movable cover 9 individually. Alternatively, the male screw part (movement guide part) formed on the other male screw rod 11A may correspond to the other movable cover 10 individually. In this case, even if the pitch width (movement guide amount) of each male screw portion (movement guide portion) is the same, the number of rotations of both male screw rods 11 and 11A is determined by the difference in the movement stroke width of both movable covers 9 and 10. By changing according to this, it is possible to make a difference in the manner of movement of each movable cover 9, 10.
[0042]
In the above embodiment, the example in which the two movable covers 9 and 10 are used has been described. However, the number of the movable covers forming the telescopic structure may be plural, and may be more than two.
[0043]
In the embodiment, the telescopic cover device in the machine tool 1 has been described as an example. However, a plurality of movable covers may move together with a moving member that moves along a boundary that divides the driving mechanism area (first area) and an area (second area) adjacent to the driving mechanism area. For example, the present invention may be embodied as a telescopic cover device in a welding machine, a car washer, or the like.
[0044]
Next, technical ideas other than the inventions described in the claims that can be grasped from the embodiment will be described below together with their effects.
(A) In the telescopic cover device according to claim 1 or 2, one of the driving bodies is provided, and a plurality of moving guides are moved and guided by the one driving body so as to individually correspond to the movable covers. A telescopic cover device provided with a difference in the amount of movement guidance per unit driving time of the driving body for each unit. With such a configuration, it is not necessary to provide a plurality of driving bodies, and the cost of the apparatus can be further reduced.
[0045]
【The invention's effect】
As described in detail above, according to the present invention, the demand for high-speed, high-acceleration and deceleration of the movement of each movable cover forming the telescopic structure is reduced, while preventing the occurrence of mechanical shock and noise, at a low cost. And the durability can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a telescopic cover device in a machine tool.
FIG. 2 is a plan view of a main part of the telescopic cover device.
[Explanation of symbols]
2 Spindle head 6 as moving member 6 Servo motor 9 and 10 for spindle head as driving source Movable cover 11, 11A Male screw rods 12a, 13a as rotating members Male screw portions 14, 15 as moving guides Coupling means Female screw body 16, 17 connecting member 18 forming linking means Servo motor L for cover as drive source Boundary line E1 Cutting area E2 as first area Machine configuration area as second area

Claims (5)

When the moving member moves while partially facing one of the two areas along a boundary line that defines the first area and the second area adjacent to the first area, In a telescopic cover device including a plurality of movable covers that form a telescopic structure that moves along the boundary line based on the driving force of the driving mechanism housed in the other area of both areas,
The driving mechanism is provided with a driving body driven in a predetermined direction, and the driving body is provided with a plurality of moving guides so as to individually correspond to the respective movable covers. A telescopic cover device provided with linking means for connecting and engaging the individually corresponding moving guides and the movable cover. The driving body is a rotating member that is driven to rotate about an axis along the boundary line direction, and the moving guide portions are formed in a spiral shape with a predetermined pitch width on a peripheral surface of the rotating member. The telescopic cover device according to claim 1, wherein The spiral pitch width of each of the moving guides is such that when the movable covers are in the extended state of the telescopic structure, the pitch of the moving guide corresponding to the movable cover closer to the moving member is the pitch width. 3. The telescopic cover device according to claim 2, wherein a configuration is larger than a pitch width of a moving guide portion corresponding to a movable cover on a side farther from the moving member. 4. The moving guide amount of the driving body per unit driving time in each of the moving guide portions is proportional to a moving stroke width of each movable cover individually corresponding to each of the moving guide portions. The telescopic cover device according to any one of the preceding claims. 5. The driving mechanism according to claim 1, wherein a driving source for moving a moving member and a driving source for driving the driving body are separately provided, and both driving sources are operated synchronously. The telescopic cover device according to any one of the above.

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