JPH071269Y2 - Dustproof device for Cartesian coordinate robot - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a dustproof device for a Cartesian coordinate robot,
More specifically, the present invention relates to a dustproof device for a Cartesian coordinate robot in which a dustproof sheet that covers an opening surface of a base casing that supports a slide base so as to reciprocate is guided into the slide base by a guide roll.

<Problems to be Solved by Conventional Techniques and Inventions> Conventionally, there has been provided a Cartesian coordinate robot that can easily cope with an increase or decrease in the number of axes as a type of industrial robot.

This Cartesian coordinate robot has a slide base that can be reciprocated with at least a part protruding from a base casing whose one surface is open. For example, a ball screw installed inside the base casing. Is inserted into the ball screw nut of the slide base, and the rotation direction and the rotation amount of the ball screw are controlled, so that the slide base can be moved to a desired position. Further, a dustproof device is provided to prevent dust from entering the inside of the base casing accommodating the ball screw. As a specific configuration of this dustproof device, a guide roll is provided inside the slide base, and a part of the dustproof sheet that is strained to cover the opening of the base casing is diverted by the guide roll, so that the ball It is possible to satisfactorily transmit the driving force to the slide base with the screw and to achieve good dustproof performance with the dustproof sheet.
74893 and U.S. Pat. No. 4,545,290).

However, in the dustproof device having the above-mentioned configuration, when the dustproof sheet is loosened, it comes into contact with a portion that does not come into contact with the dustproof sheet under tension, that is, the inner surface of the slide base. Specifically, as shown in FIG. 5 (A), only the central portion of the dust-proof sheet comes into contact by bending upward, or, as shown in FIG. 5 (B), in the vicinity of the upper guide roll. Contact by being guided upwards at. Therefore, there is an inconvenience that the contact portion of the slide base is worn and the dustproof sheet is soiled as the slide base reciprocates. If the former inconvenience becomes noticeable, the slide base needs to be replaced, resulting in much labor. On the other hand, if the latter disadvantage becomes noticeable,
As a result, the external appearance is significantly impaired and the dustproof sheet needs to be replaced, resulting in a great deal of labor. In order to eliminate such inconvenience, it is sufficient to increase the distance between the dustproof sheet and the inner surface of the slide base, but each axis of the Cartesian coordinate robot becomes large as a whole, and the weight increases and the strength decreases. There is a new inconvenience of inviting.

Further, if there is a foreign matter on the dustproof sheet for some reason, the foreign matter is bitten into the guide roll and the dustproof sheet and the guide roll are damaged when the Cartesian coordinate robot is operated as it is. This inconvenience occurs regardless of the distance between the dustproof sheet and the inner surface of the slide base, and a great deal of labor is required to replace the dustproof sheet and the guide roll.

<Purpose of Invention> This invention was made in view of the above problems,
To provide a dustproof device for a Cartesian coordinate robot that has a simple structure and can extend the life of the slidebase without increasing the height of the slidebase and can significantly reduce the dirt on the dustproof sheet. The purpose is to do.

<Means for Solving the Problems> In order to achieve the above object, a dustproof device for a Cartesian coordinate robot of the present invention has a cover member for covering a guide roll provided on a slide base, and a dustproof sheet for the cover member. A plate-shaped guide member having a low coefficient of friction is provided on at least a part of the side surface.

However, it is preferable that the cover member has one edge close to the upper surface of the dustproof sheet before being introduced into the slide base.

However, as the guide member, one formed of an arbitrary material can be used, but it is preferable that the guide member has abrasion resistance, and the frequency of exchanging the guide member can be reduced. Specifically, for example, one formed of hard polyethylene or the like is preferable because good abrasion resistance can be exhibited and a slide with low friction can be achieved. The guide member has only to be provided on at least a part of the cover member, but it is most preferable to provide it on the central portion, and further, it may be provided on the entire surface. Further, the dust-proof sheet may be one having sufficient tensile strength and flexibility such as a sheet made of metal in the form of a thin plate or a sheet obtained by laminating a plurality of synthetic resin sheets and integrating them.

<Operation> With the dustproof device having the above configuration, when the slide base is reciprocally moved through the driving force transmission mechanism housed in the base casing, the dust is guided by the guide roll and guided into the slide base. Even if the dustproof sheet comes loose and comes into contact with the inner surface of the slide base,
Since it contacts the plate-shaped guide member of the cover member instead of contacting the inner surface of the slide base, abrasion of the slide base itself can be prevented and contamination of the dustproof sheet can be significantly suppressed. Further, the dimensions of the slide base itself can be made the same as those of the conventional slide base, and an increase in size can be prevented. Further, when the guide member is worn, it is only necessary to remove the guide member together with the cover member and mount a new cover member, and the work can be remarkably simplified as compared with the case where the slide base itself is replaced. In this case,
If the guide member also has abrasion resistance, the frequency of replacing the cover member can be reduced.

And, when the cover member has one edge close to the upper surface of the dustproof sheet before being introduced into the slide base, even if there is a foreign substance on the dustproof sheet,
It is possible to reliably prevent foreign matter from entering the slide base, and in turn, guide rolls caused by foreign matter being caught,
It is possible to reliably prevent damage to the dustproof sheet.

<Examples> Hereinafter, detailed description will be given with reference to the accompanying drawings illustrating examples.

FIG. 4 is a longitudinal sectional view showing only one axis of a Cartesian coordinate robot incorporating the dustproof device of the present invention.

A ball screw (2) and a pair of guide rails (3) are housed inside a base casing (1) having a predetermined length, and a dustproof sheet is provided so as to cover the opening surface of the base casing (1). Both ends of (4) are fixed. A motor (5) for rotating the ball screw (2) is provided at a predetermined position of the base casing (1). In addition, it has a ball screw nut (6a) to be screwed with the ball screw (2) and also has a guide rail (3).
A part of a slide base (6) having a linearly moving slider (6b) engaging with is projected from the base casing (1).

FIG. 1 is an enlarged central vertical cross-sectional view showing a main part of the dustproof device, and a dustproof sheet insertion hole (6c) is formed at a predetermined position of the slide base (6) protruding from the base casing (1). At the same time, four guide rolls (7a) and (7b) are provided at predetermined positions in the dustproof sheet insertion hole (6c).
The guide roll (7a) located at the most end is provided so as to be almost at the same height as the opening surface of the base casing (1), and the remaining guide rolls (7b) are attached to the base casing ( It is provided so as to be located outside of 1). Therefore, the dustproof sheet (4) is wound around the guide roll (7a) located at the most end portion from below, and is wound around the remaining guide roll (7b) from above. The cover member (7a) positioned at the most end of each and the remaining guide roll (7b) close to the guide roll (7) are bent at a right angle so as to cover the guide member (7b). 8) is detachably attached to the slide base (6), and a plate-shaped guide member (9) made of hard polyethylene or the like is provided at a predetermined position of the cover member (8) near the remaining guide roll (7b). Is attached.

FIG. 2 is a perspective view showing the configuration of the cover member and the guide member, in which the horizontal plate portion (8a) of the cover member (8) is formed to be slightly narrower than the dustproof sheet insertion hole (6c), The vertical plate portion (8b) is formed to have substantially the same width as the slide base (6). Then, screw holes (8c) for screwing the slide base (6) are formed at both ends of the vertical plate portion (8b). Further, a plate-shaped guide member (9) is attached to the central portion on the front end side of the horizontal plate portion (8a), and the guide member (9) prevents dust at least a predetermined distance inside the guide roll (7b). It covers the upper part of the central part of the seat (4). However, it is preferable to cover the upper part of the center of the dustproof sheet over a predetermined distance inside the guide roll (7a). Further, in the height of the vertical plate portion (8b), the distance between the upper surface of the dustproof sheet (4) and the lower surface of the guide member (9), which is not loosened, is about 3 mm as in the conventional dustproof device. Is preferably set as follows. Further, the width of the dustproof sheet (4) is preferably smaller than the width of the dustproof sheet insertion hole (6c) and larger than the opening width of the base casing (1), so that good robot operation and dustproof performance are exhibited. it can.

The operation of the Cartesian coordinate robot having the above configuration is as follows.

If the motor (5) rotates the ball screw (2) in any direction by an arbitrary angle, the ball screw nut (6a) screwed with the ball screw (2) converts it into a translational force. Therefore, the slide base (6) moves to an arbitrary position.

In this case, since the dust-proof sheet (4) is bypassed only between the guide rolls (7a), the state in which the opening surface of the base casing (1) is covered is maintained and dust or the like enters. This can be reliably prevented. Further, when the slide base (6) moves, the bypass portions of the dustproof sheet (4) sequentially move, and since the dustproof sheet (4) is tensioned,
As it is, the dustproof sheet (4) and the guide member (9) do not come into contact with each other. Further, since the lower end edge of the vertical plate portion (8b) of the cover member (8) is close to the upper surface of the dustproof sheet (4), even if foreign matter is present on the dustproof sheet (4), the slide can be performed. Guide roll (7a) that surely blocks entry into the base (6) and causes foreign matter to be caught
(7b), the dustproof sheet (4) can be prevented from being damaged.

Further, when the dustproof sheet (4) is loosened, the dustproof sheet is curved and projected upward between the guide rolls (7b) in the vicinity of the guide roll (7b) on the advancing side (see FIG. )), Or only the central portion of the dustproof sheet (4) is curved and projected upward (see FIG. 3 (B)). Therefore, in the conventional dustproof device, the dustproof sheet and the inner surface of the slide base are in contact with each other in these states. However, in the dustproof device of this embodiment, the dustproof sheet (4) is forcibly brought into contact with the guide member (9) to prevent the curved projection from coming into contact with the inner surface of the slide base (6). The wear of the base (6) can be prevented in advance, and since the guide member (9) has a low friction coefficient, the contamination of the dustproof sheet (4) can be significantly suppressed. Further, since the slide base (6) itself does not wear, but the guide member (9) wears, it is necessary to replace the guide member (9). However, in order to replace the guide member (9), the vertical plate portion (8b) is unscrewed from the slide base (6), the guide member (9) is removed together with the cover member (8), and a new guide member (9) is removed.
Since it suffices to mount the cover member (8) to which is adhered, workability can be significantly improved. That is, since the workability is remarkably high as compared with the conventional dustproof device in which the slide base (6) itself is replaced, the guide member (9) is used.
It is not necessary to use a material having particularly high wear resistance, but it is preferable to use material having high wear resistance because the frequency of exchanging the guide member (9) can be significantly reduced.

The present invention is not limited to the above-described embodiment, and for example, a synthetic resin having a low friction coefficient is integrally molded on the lower end edge of the vertical plate portion (8b) of the cover member (8) to form a dustproof sheet ( In addition to being able to be in constant contact with the upper surface of 4), various design changes can be made without departing from the scope of the invention.

<Effect of device> As described above, the device of the present invention is provided with the cover member detachably so as to cover the vicinity of the guide roll provided on the slide base for bypassing the dustproof sheet, and the low friction coefficient is provided at the predetermined position of the cover member. Since a plate-shaped guide member with a guide is provided, wear of the slide base itself due to loosening of the dustproof sheet can be prevented, contamination of the dustproof sheet can be significantly reduced, and the worn guide member can be replaced. Has a practicable unique effect that can be significantly simplified.

The second invention has a unique practical effect of reliably preventing the inconvenience that foreign matter that may be present on the dustproof sheet enters the slide base and damages the guide roll and the dustproof sheet.

[Brief description of drawings]

FIG. 1 is an enlarged central vertical cross-sectional view showing a main part of the dustproof device, FIG. 2 is a perspective view showing a configuration of a cover member and a guide member, and FIG. 3 is a schematic vertical cross-sectional view illustrating a loosened state of the dustproof sheet, FIG. 4 is a vertical sectional view showing only one axis of a Cartesian coordinate robot incorporating the dustproof device of the present invention, and FIG. 5 is a schematic vertical sectional view for explaining a loosened state of the dustproof sheet in the conventional example. (1) ...... Base casing, (2) ...... Ball screw,
(4) …… Dustproof sheet, (6) …… Slide base,
(6a) …… Ball screw nut, (7a) (7b) …… Guide roll, (8) …… Cover member, (8b) …… Vertical plate,
(9) …… Guide member

Claims (2)

[Scope of utility model registration request] 1. A base casing (1) has a slide base (6) protruding from an opening surface thereof, and a driving force transmission mechanism (2) (6a) housed in the base casing (1). The slide base (6) is made to reciprocate, and the dustproof sheet (4) covering the opening surface of the base casing (1) is circumvented by the guide rolls (7a) and (7b), so that the slide base (6) is moved. In the Cartesian robot which is guided inside, a cover member (8) covering the guide rolls (7a), (7b) is detachably provided on the slide base (6), and the cover member (8) is dust-proof. A dustproof device for a Cartesian coordinate robot, characterized in that a plate-shaped guide member (9) having a low friction coefficient is provided on at least a part of the surface on the sheet (4) side. 2. The utility model registration claim wherein the cover member (8) has one edge (8b) close to the upper surface of the dustproof sheet (4) before being introduced into the slide base (6). A dustproof device in the Cartesian coordinate robot according to item 1.