JP4078175B2 - Telescopic cover device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic cover device that is provided on a boundary that requires spatial separation and blocking, such as a boundary between a cutting area and a machine component area of a machine tool, and that can extend and contract along the boundary. .
[0002]
[Prior art]
Generally, in a machine tool, a spindle head as 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. The workpiece surface is moved back and forth in the axial direction (Z-axis direction) at a position for cutting the workpiece 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 and a meshing gear for guiding the moving direction when the spindle head moves. It is out. And since these drive mechanisms are for performing the positioning of the spindle head at the time of workpiece machining with high precision, the cutting waste generated by the machining of the workpiece surface does not enter the mechanical components of the drive mechanism. It is necessary to do so.
[0003]
Therefore, in order to meet such demands, conventionally, a plurality of movable covers (hereinafter referred to as “the cover”) are separated at the boundary between the cutting area in which the spindle head moves and the machine configuration area of the drive mechanism. A telescopic cover device is provided which is combined so as to form a telescopic structure. As such a telescopic cover device, there is conventionally known a type in which the covers adjacent to each other are sequentially hooked or brought into contact with each other when the entire cover is expanded or contracted. However, the problem is that mechanical impacts and noises are generated by the hooking or abutting at the time of expansion and contraction.
[0004]
Therefore, in order to solve such a problem, a telescopic cover device as described in, for example, Patent Document 1 has recently been proposed. That is, in the apparatus described in this publication, a toothed drive belt that travels and moves in a circulating manner is used as a drive source, and each movable cover is set separately from the other movable cover adjacent to each other by a driving force set by each movable cover. Are moving in different manners. And as a configuration for that, in the device described in the above publication, a double-shaft structure reduction device having an input pinion and an output pinion is attached to each movable cover, and the reduction ratio of the reduction device is between adjacent movable covers. The difference made it possible to make a difference in moving speed. In addition, the above publication also discloses a telescopic cover device that extends and superimposes each movable cover by individually installing a linear motor as each drive source for each movable cover and allowing it to self-run with a predetermined speed difference. ing.
[0005]
[Patent Document 1]
JP-A-8-192332 (Claim 1, Claim 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 a complicated configuration, 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 composed of 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 inferior.
[0007]
The present invention has been made in view of the above-described circumstances, and its purpose is to meet the demand for high-speed, high-acceleration / deceleration movement of each movable cover forming a telescopic structure by generating 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 being prevented and which has improved durability.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the moving member is located between the two areas along a boundary line that divides the first area and the second area adjacent to the first area. A plurality of telescopic structures each moving along the boundary line based on the driving force of the driving mechanism housed in the other area of the two areas when moving with a portion facing one of the areas. In the telescopic cover device provided with the movable cover, the drive mechanism is provided with a drive body that is driven in a predetermined direction, and the drive body is provided with a plurality of movement guide portions so as to individually correspond to the movable covers, The gist of the invention is that link means for connecting and engaging the individually corresponding movement guide portions and the movable cover is provided between each movement guide portion and each movable cover.
[0009]
The invention according to claim 1, the pre-SL driver a rotating member that is rotationally driven about an axis along the boundary direction, each movement guiding section on the peripheral surface of the rotating member The gist is that they are formed in a spiral shape with a predetermined pitch width.
[0010]
The invention of claim 1, prior Symbol helical pitch width of each mobile guide portion, when each movable cover is in the extended state of the telescopic structure, the side movable cover close to the moving member The gist is that the pitch width of the corresponding movement guide portion is larger than the pitch width of the movement guide portion corresponding to the movable cover far from the moving member.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the amount of movement guidance per one rotation of the driving body in each movement guide portion is the value of each movable cover corresponding to each movement guide portion individually. The gist is that it is proportional to the moving stroke width.
[0012]
The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the drive mechanism separately provides a drive source for moving the moving member and a drive source for driving the drive body. Thus, the gist is that the two driving sources are operated synchronously.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a telescopic cover device for a machine tool that performs workpiece cutting and the like will be described below with reference to FIGS.
[0014]
As shown in FIGS. 1 and 2, the machine tool 1 according to the present embodiment supports a spindle head 2 as a moving member so as to be movable up and down in the horizontal direction (in FIG. 1, the left and right direction, the same applies hereinafter). A column 3 that reciprocates is provided. As shown in FIG. 1, a female screw body 4 is attached to the lower part of the column 3. The female screw body 4 includes a male screw portion 5 a on a male screw rod 5 that is rotatable about an axis along the horizontal direction. It is screwed. Then, the spindle head 2 moves in the horizontal direction together with the column 3 by rotating the spindle head servomotor 6 as a drive source operatively connected to one end of the male screw rod 5.
[0015]
A pair of overhanging covers 7 are attached to the front surface of the column 3 on which the spindle head 2 is supported at positions that are symmetrical with respect to the spindle head 2. As shown in FIG. 2, the left and right projecting covers 7 include a cutting area (first area) E1 in which the spindle head 2 moves substantially facing the entire surface, the male screw rod 5 and the spindle head servo. It is located on a boundary line L that partitions a machine configuration area (second area) E2 in which the motor 6 and the like are accommodated. The mechanical configuration of the male screw rod 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 are illustrated in the machine tool 1 at positions that are further spaced outward from the respective moving end positions of the spindle head 2 in the horizontal direction by a predetermined distance. Do not stand on the 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 the rear end portion thereof is located in the machine configuration area E2, while the front end portion thereof is the cutting area. The arrangement is located at E1. A plurality of movable covers 9 and 10 (two on the left and right sides of the spindle head 2 in this embodiment) between the fixed cover 8 and the overhanging cover 7 are formed along the boundary line L. It is provided movably.
[0017]
That is, each of the movable covers 9 and 10 is configured to be relatively movable in a nested manner between the overhanging cover 7 and the fixed cover 8. As the spindle head 2 moves, the telescopic structure extends (the relative position of the covers 7 to 10 on the right side of the spindle head 2 in FIG. 2) and the superposed state (the left side of the spindle head 2 in FIG. 2). Relative positions of the respective covers 7 to 10).
[0018]
Next, the drive mechanism of the movable covers 9 and 10 will be described. As shown in FIGS. 1 and 2, a single drive body and a male screw rod 11 as a rotating member are rotatably installed in the direction along the boundary line L above the machine configuration area E2. . The male threaded rod 11 has a cylindrical portion 12 with a large diameter at the center in the length direction and a cylindrical portion 13 with a small diameter at both ends in the length direction. Male threaded 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 as the movement guide amount in both the male screw portions 12a and 13a is formed 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 rod 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 rod 5 is set to 60 mm. The movement stroke width when the spindle head 2 moves from one movement end position to the other movement end position is 600 mm for the spindle head 2, 350 mm for the movable cover 9, and the movable cover 10. Is set to 150 mm.
[0020]
Female thread bodies 14 and 15 each having a ball screw structure are screwed into the cylindrical parts 12 and 13 so as to individually correspond to the male thread parts 12a and 13a. The female screw body 14 and the movable cover 9 are connected by a connecting member 16, and the female screw body 15 and the movable cover 10 are connected by a connecting member 17. In this embodiment, the female screw bodies 14 and 15 and the connecting members 16 and 17 constitute a linking means. A male threaded rod 11A having the same configuration as the male threaded rod 11 is installed in the direction along the boundary line L in the lower part of the machine configuration area E2. The female screw bodies 14 and 15 are also screwed into the respective cylindrical portions 12 and 13 of the male screw rod 11A, and the connecting members 16 are connected between the female screw bodies 14 and 15 and the movable covers 9 and 10. , 17.
[0021]
Also, a cover servo motor 18 as a drive source is operatively connected to one end portion (the right end portion in FIGS. 1 and 2) of the male screw rod 11 located on the upper side of the male screw rods 11 and 11A. . A timing belt 20 is hung between the timing pulleys 19 provided near one end of the male screw rods 11 and 11A. When the cover servo motor 18 rotates, the male screw rods 11 , 11A are rotationally driven synchronously.
[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 adjustment unit 23. The servo motors 6 and 18 are configured to be operated synchronously based on control signals input via the servo motor adjustment units 21 and 23 from the numerical control (NC) arithmetic unit 22, 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. Each content is exposed. However, this is intentionally drawn up and down the upper and lower edges of the covers 7 to 10 in order to clearly show the individually corresponding relationship between the movable covers 9 and 10 and the male screw portions 12a and 13a as the movement guide portions. The drive mechanism such as the male screw rod 11 is actually hidden behind the covers 7 to 10.
[0024]
Next, the operation of the telescopic cover device in the machine tool 1 according to the present embodiment configured as described above will be described.
In FIG. 2, the movable covers 9 and 10 on the left side of the spindle head 2 in FIG. 2 are superposed at one moving end position, and the movable covers 9 and 10 on the right side of the spindle head 2 are in an extended state. It is shown that. Therefore, the case where the spindle head 2 moves to the right side from this state toward the other moving end position will be described below.
[0025]
First, a rotation drive signal is output from the numerical control (NC) arithmetic unit 22 to the spindle head servo motor 6 via the servo motor 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 rotation drive signal is a command signal for rotating the spindle head servo motor 6 and the cover servo motor 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 based on the respective rotation drive signals. 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. Further, based on the driving force of the cover servo motor 18, the male screw rod 11 positioned on the upper side rotates counterclockwise as viewed from the cover servo motor 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 male screw rods 11 and 11A. . Therefore, both the male screw rods 11 and 11A positioned on the upper side and the lower side are both rotated counterclockwise 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 helical male screw portion 5a formed on the peripheral surface of the male screw rod 5 is shown in FIG. Start moving to the right. Accordingly, the column 3, the spindle head 2 and the overhanging cover 7 also move to the right as the female screw body 4 moves. At this time, if the male threaded rod 5 is rotationally driven at 3000 revolutions / minute, the amount of movement by the male threaded part 5a whose pitch width is set to 60 mm is 180 m / minute, and the spindle head 2 is the spindle head. The movement stroke width of 2 (600 mm) is completed in 0.2 seconds.
[0028]
On the other hand, when the male screw rods 11 are rotationally driven in synchronization with the rotational drive of the male screw rods 5, spiral male screws formed on the cylindrical portions 12 and 13 of the male screw rods 11 and 11A. The female screw bodies 14 and 15 screwed into the portions 12a and 13a simultaneously start moving to the right side in FIG. Therefore, as the female screw bodies 14 and 15 move, the movable covers 9 and 10 connected to the female screw bodies 14 and 15 via the connecting members 16 and 17 also move to the right. At that time, as in the case of the male screw rod 5, both male screw rods 11 and 11A are also driven to rotate at 3000 rpm.
[0029]
Accordingly, 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 within 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 having the pitch width 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. As the movement is completed, the movable covers 9 and 10 are in an extended state with the movable covers 9 and 10 on the left side of the spindle head 2 and the movable covers 9 and 10 on the right side of the spindle head 2 are in the other state. It will be in the state which superposed | polymerized in the movement end position.
[0030]
Thus, when the spindle head servomotor 6 and the cover servomotor 18 are rotationally driven at the same rotational speed (for example, 3000 rpm) based on the rotational drive signal from the numerical control (NC) arithmetic unit 22. The spindle head 2 and the movable covers 9 and 10 start moving simultaneously and stop moving simultaneously. That is, the movable covers 9 and 10 move simultaneously at different moving speeds (moving modes) within the moving stroke width set for each of the movable covers 9 and 10. The actual movement stroke width with respect to the spindle head 2 and the like is calculated as necessary by a numerical control (NC) calculation device 22 and the rotation drive time is adjusted in the rotation drive signal.
[0031]
Contrary to the above description, when the spindle head 2 translates from the right side to the left side in FIG. 2, the spindle head servomotor 6 and the spindle head servo motor 6 and The cover servomotor 18 is driven to rotate in the opposite direction to that described above. Then, according to the same driving principle as described above, the spindle head 2 and the movable covers 9 and 10 start moving simultaneously from the right side to the left side and stop moving simultaneously.
[0032]
Therefore, according to the telescopic cover device in the machine tool 1 of the above embodiment, the following features can be obtained.
(1) In the above embodiment, the driving body for moving the movable covers 9 and 10 is constituted by the male screw rod 11, and a plurality of male screw portions (movement guide portions) 12a and 13a are moved to the male screw rod 11. The movable covers 9 and 10 are provided so as to individually correspond with a difference in pitch width as a guide amount. Then, when the individually corresponding movable covers 9 and 10 and the male screw portions 12a and 13a are connected via the female screw bodies 14 and 15 and the connecting members 16 and 17 as the linking means, and the male screw rod 11 is driven to rotate. The movable covers 9 and 10 together with the female screw bodies 14 and 15 and the like are configured to move in a predetermined direction with a difference in their movement modes. Therefore, unlike the conventional case, each movable cover 9, 10 is not provided with a speed reduction device or a linear motor having a complicated and composed of many precision parts. It is possible to reliably realize the request to do so at a low cost while preventing the occurrence of mechanical shock and noise, and to improve the durability.
[0033]
(2) In the above embodiment, the driving body is constituted by the male threaded rod 11 that is a rotating member that is rotationally driven about the axis line along the boundary L direction, and each male threaded portion 12a, The movement guide unit is configured by 13a. Therefore, since the driving body provided in the driving mechanism for moving the movable covers 9 and 10 has a simple configuration of the male screw rod 11 as a rotating member, the apparatus cost can be further reduced and the durability can be 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 close to the spindle head (moving member) 2 is set. It was made larger than the pitch width of the male screw portion 13a individually corresponding to the movable cover 10 on the side far from the spindle head 2. In other words, the helical pitch widths of the male screw portions 12a and 13a were configured to be 35 mm and 15 mm, respectively. Accordingly, when the movable covers 9 and 10 move between the extended state and the overlapped state, the movable cover 10 on the side farther from the spindle head 2 having a large moving stroke width is set to have a small moving stroke. Further, it can be moved without delay in comparison with the movable cover 9 on the side close to the spindle head 2.
[0035]
(4) In the above embodiment, the movement guide amount (pitch width) per unit driving time of the male screw rod 11 in each male screw portion 12a, 13a is proportional to the movement stroke width 350mm, 150mm of each movable cover 9, 10. The configuration is related. Therefore, the required time from the start of movement of each movable cover 9, 10 to the completion of movement is the same, and each movable cover 9, 10 can be operated synchronously. In addition, when it is desired to adjust the moving speed of each movable cover 9, 10, it can be easily achieved by adjusting the number of rotations of the male screw rod 11.
[0036]
(5) In the above-described embodiment, a cover servo motor 18 for moving the movable covers 9 and 10 is provided separately from the spindle head servo motor 6 which is a drive source of the spindle head 2. 18 was operated synchronously. Therefore, even if movement resistance is generated in the movable covers 9 and 10 due to, for example, biting of cutting waste, the movement resistance does not become the movement resistance of the spindle head 2 and the machining accuracy in the machine tool 1 is improved. No adverse effect.
[0037]
In addition, you may change the said embodiment as follows.
In the above embodiment, the male screw rod 11 as a driving body is rotationally driven by one cover servo motor 18, and the rotational force is transmitted to the male screw rod 11A as another driving body via the timing belt 20 or the like. It was like that. However, two cover servomotors 18 may be provided, and the male screw rod 11 may be rotationally driven by one servomotor 18 and the male screw rod 11A may be rotationally driven by the other servomotor 18.
[0038]
In the above embodiment, the driving source (spindle head servomotor 6) for moving the spindle head 2 as a moving member and the driving source (cover servomotor 18 for driving the male screw rod 11 as a driving body) are used. ) And have been provided separately. However, a configuration may be adopted in which a driving source for moving the spindle head 2 and a driving source for rotational driving of the male screw rod 11 are combined with one driving source (for example, a servo motor).
[0039]
-Moreover, in the said embodiment, the pitch width of each male thread part 12a, 13a in the male threaded rod 11 was set to 35 mm and 15 mm, respectively. However, if the pitch widths of the male screw portions 12a and 13a are proportional to the movement stroke widths (350 mm and 150 mm) of the individually corresponding movable covers 9 and 10, they are set to 70 mm and 30 mm, for example. Well, it is not limited to the pitch width (35 mm, 15 mm) in the above embodiment.
[0040]
-Moreover, in the said embodiment, it comprised so that the pitch width (35 mm, 15 mm) of each male thread part 12a, 13a might be proportional to the movement stroke width (350 mm, 150 mm) of the individually corresponding movable covers 9,10. . However, when each movable cover 9, 10 is in the extended state, the pitch width of the male screw portion 12 a corresponding to the movable cover 9 on the side closer to the spindle head 2 is closer to the movable cover 10 on the side farther from the spindle head 2. It is only necessary that the configuration is larger than the pitch width of the corresponding male screw portion 13a, and the proportional relationship is not necessarily required.
[0041]
In the above embodiment, the driving body is constituted by a single male threaded rod 11, and the pitch width of each male threaded portion 12a, 13a is 35 mm and 15 mm, respectively, in the single male threaded rod 11. It was set. However, the drive body is composed of a plurality of (for example, two) male screw rods 11, 11 A, and the male screw portion (movement guide portion) formed on one male screw rod 11 is individually associated with one movable cover 9. The male screw portion (movement guide portion) 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 rotational speed of both male screw rods 11 and 11A is changed to the difference in the movement stroke width of both movable covers 9 and 10. By changing accordingly, it is possible to make a difference in the movement mode of the movable covers 9 and 10.
[0042]
In the above-described embodiment, the example using the two movable covers 9 and 10 has been described. However, the number of movable covers having a telescopic structure may be plural, and may be more than two.
[0043]
In the above embodiment, the telescopic cover device in the machine tool 1 has been described as an example. However, a plurality of movable covers move together with a moving member that moves along a boundary line that divides the drive mechanism area (first area) and an area adjacent to the drive mechanism area (second area). For example, it may be embodied in a telescopic cover device in a welding machine, a car wash machine or the like.
[0044]
Next, technical ideas that can be grasped from the above embodiment will be described below together with their effects.
(B) In the Te-less Copic cover device, provided one said drive member, one of said drive member a plurality of movement guide portions for each movement guiding section as individually corresponding said to the one drive member to the movable cover A telescopic cover device provided with a difference in the amount of movement guidance per rotation . With such a configuration, it is not necessary to provide a plurality of driving bodies, and the apparatus cost can be further reduced.
[0045]
【The invention's effect】
As described above in detail, according to the present invention, a request for increasing the speed and acceleration / deceleration of each movable cover forming the telescopic structure is requested at a low cost while preventing the occurrence of mechanical shock and noise. Thus, it can be surely realized and 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 an essential part of a telescopic cover device.
[Explanation of symbols]
2 Main spindle head 6 as moving member 6 Servo motor 9 for main spindle head as drive source Movable cover 11, 11A Male screw rods 12a, 13a as rotating members Male screw parts 14, 15 as moving guide parts Female screw bodies 16, 17, a connecting member 18 constituting a linking means, a cover servo motor L as a drive source, a boundary line E 1, a cutting area E 2 as a first area, and a machine configuration area as a second area

Claims (3)

When the moving member moves partially facing one of the two areas along the boundary line that divides the first area and the second area adjacent to the first area, In a telescopic cover device comprising a plurality of movable covers having a telescopic structure that moves along the boundary line based on the driving force of a drive mechanism housed in the other area of both areas,
The drive mechanism is provided with a drive body that is driven in a predetermined direction, and the drive body is provided with a plurality of movement guide portions so as to individually correspond to the respective movable covers. In the meantime, a link means for connecting and engaging the individually corresponding movement guide portion and the movable cover is provided ,
The driving body is a rotating member that is driven to rotate about an axis along the boundary line direction, and each movement guide portion is formed in a spiral shape with a predetermined pitch width on a peripheral surface of the rotating member. Formed into
The spiral pitch width of each of the moving guides is such that the pitch width of the moving guide corresponding to the movable cover closer to the moving member is greater when each of the movable covers is in a telescopic structure extended state. A telescopic cover device configured to be larger than a pitch width of a movement guide portion corresponding to a movable cover on a side far from a moving member . 2. The telescopic cover device according to claim 1 , wherein a movement guide amount per one rotation of the driving body in each movement guide unit is proportional to a movement stroke width of each movable cover individually corresponding to each movement guide unit . The driving mechanism is constituted by providing a driving source for driving the driving source and the driving member for moving the moving member separately, according to claim 1 or 2 both said driving source is synchronous operation Telescopic cover device.

Images