JPS63318232A - Thread tightening device - Google Patents

Abstract

PURPOSE:To prevent attachment of dust to a work completely by providing a dust suction cover each at a thread tightening function part and a chuck part and providing a shutter to open/close the opening part of the cover corresponding to the work. CONSTITUTION:A thread tightening function part installed in a support table 7 is contained in a top dust suction cover 2, and a chuck part 20 is contained in a chuck part dust suction cover 1. Under the chuck part 20 is provided a shutter for opening/closing an opening part of the dust suction cover 1. A screw to be threaded into the work 11 is sent by air pressure from a feeder 9 through a feeding hose to the forward end of the chuck unit 20, when the shutter 4 is closed, so attachment of dust to the work 11 can be avoided. Between the chuck part dust suction cover 1 and the work 11 is formed a gap along the whole periphery, so if the shutter is opened for thread tightening, air flows through the gap toward the exhaust port of the dust suction cover 1, so dust produced in thread tightening is discharged without being attached to the work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screw tightening device used, for example, in a clean room.

[Conventional technology]

FIG. 7 is a sectional view showing the tip of the driver, that is, the tip of the sleeve, of a conventional screw-adsorption type screw tightening device disclosed in, for example, Japanese Utility Model Application Publication No. 61-46170.
In the figure, 0 is a bit that can be raised and lowered and rotated forward and backward.
(to) is a movable sleeve, and the tip opening () is designed to attract screws 4 by vacuum. Reference numeral ``Z'' is a movable sleeve, and a built-in spring is provided to always urge the movable sleeve (2) downward, that is, in the direction of arrow (4). (Incorporated) is an exhaust port, which is installed to vacuum the dust generated inside the sleeve (1) and the dust generated during screw tightening work and discharge it outside the clean room. .

Since the conventional screw tightening device is configured as described above,
After the screw (to) fed to a predetermined position by a screw feeder (not shown) is sucked into the tip opening (7) of the movable sleeve (2) by vacuuming, a driver,
That is, the movable sleeve is moved directly above the screw tightening position of the workpiece (b), and while lowering this sleeve (7), the tip of the bit (to) is fitted into the groove of the screw (2), Start tightening the screws.

In Figure 7, the screw (2) is the thread size (1ta) of the workpiece (b).
This shows the state just before it is screwed into the bit (2).
When the sleeve (to) is further lowered while rotating in the tightening direction, the screw (2) becomes the thread size (ll) of the workpiece (b).
The tip of the movable sleeve (2) comes into contact with the workpiece (b) during screwing in, and moves upward into the sleeve (to) against the spring force. Figure 8 shows the state when the screw tightening work is completed, and the tip of the movable sleeve (end) is moved by the elastic force of the spring (end).

It is pressed against the workpiece (b). Incidentally, the dust generated during the screw tightening work and the dust generated inside the sleeve are discharged from the exhaust port to the outside of the clean room.

[Problem that the invention seeks to solve]

Since the conventional screw tightening device is configured as described above,
Application is limited to a screw suction type screw tightening device equipped with a movable sleeve (2) that also serves as a screw guide as shown in FIG. In addition, the gap between the inner diameter of the moving sleeve (2) and the outer diameter (head) of the screw must be set within 0.5 m/m in order to guide the screw (2) in a normal posture. In addition, as shown in Fig. 7, the gap t between the movable sleeve and the handle (Ql) changes depending on the tightening condition of the screw. It is extremely difficult to capture and discharge reliably. moreover,
As shown in Figure 8, the movable sleeve (to) and the workpiece (
As is clear from the above explanation of operation, contact with the dust exhaust port (b) cannot be avoided, and in a screw tightening device equipped with a large number of sleeves (7), each sleeve has a dust exhaust port (7).
There were problems such as the need to establish financial institutions.

This invention was made in order to improve the above-mentioned problems, and is capable of capturing and reliably discharging dust generated during screw feeding and screw tightening, as well as the screw suction method described above. , a chuck system that holds the screw from both sides, or a multi-spindle system that incorporates multiple sleeves each with a bit, as well as a screw that has a cover that does not come into contact with the workpiece (b). The present invention aims to provide a fastening device.

[Means for solving problems]

The screw tightening device according to the present invention includes an upper dust suction cover that covers a screw fastening function part, a chuck part dust suction cover that forms a certain gap with the workpiece during screw tightening, and an opening of the chuck part dust suction cover that corresponds to the workpiece. A shutter is provided to selectively open and close the screw when feeding the screw and when tightening the screw, and each cover is provided with an exhaust port.

[Effect]

In this invention, when screws are supplied, the opening of the chuck part dust suction cover corresponding to the workpiece is closed with a shutter to prevent dust from scattering to the workpiece, and when the screw is tightened, the opening is closed by moving the shutter. At the same time, a predetermined gap is formed between the chuck part dust suction cover and the workpiece1.Thus, the dust generated near the screw when tightening the screw is sucked and discharged to the outside from the exhaust port. The dust generated inside the screw tightening device is discharged from the upper dust suction cover to the outside of the clean room through the exhaust port.

[Embodiments of the invention]

FIGS. 1 to 6 all show an embodiment of the present invention. First, in the front view and side view shown in FIGS. 2) is the upper dust suction cover, (3) is the exhaust port, and (5) is the driver of the screw tightening device. ) to transmit the rotational force for rotating the screw. An embodiment of the above is a multi-axis screw tightening device having a plurality of drivers (5), (6a) is a chuck stand, which supports the chuck unit (2), and has a chuck stand lifting cylinder ( 8a) so that it can be raised and lowered. (7) is a support stand that supports the entire screw tightening function part of the screw tightening device. Reference numeral (9) denotes a screw feeder, which supplies screws (2) to the chuck unit via a screw feed hose (2) shown in FIG. 5, which will be described later. Q
□ is the frame of the screw tightening device, (b) is the workpiece, and the pallet (
(to) is positioned in a predetermined position. (4) is a shutter which, as shown in FIG. 2, can be moved back and forth in the front and rear directions by means of a cylinder for moving the shutter (8b). Note that FIG. 8 shows the shutter (4) in FIG.
) is retreated, the chuck table (6a) is lowered by the chuck table lifting cylinder (8a), and FIG. 4 is a front view showing the state immediately before proceeding to the screw tightening operation, and FIG. 4 is a side view thereof.

Fig. 5 is an enlarged cross-sectional view of the chuck part dust suction cover (1) showing the dust suction state during screw tightening. , a screw feed hose for supplying the screw (2) is attached to the - side. Further, an exhaust hose (2) is connected to an exhaust port (3) provided on the - side of the chuck part dust suction cover (1) to remove dust generated within the chuck unit.

Also, the dust generated near the screws when tightening the screws is discharged outside the clean room.

In addition, Fig. 6 shows that inside the chuck part dust suction cover (1),
This shows an example in which a chuck mechanism (20a) is housed as a chuck unit member, and a pair of gripping claws (20b)
(20b) has a pair of springs (20C) (2
0c), and as the bit (2) descends, it opens in the direction of the arrow against the elastic force of the springs (20C) (20C), and after gripping the screw (to),
It moves toward the workpiece (B) and is screwed into the large screw (11a) by the bit (C).

Next, the operation will be explained.

As described above, the screw tightening device of the present invention has a support base (7
) The screw tightening mechanism attached to the upper dust cover (2
), and the chuck part is housed in a chuck dust suction cover (1), and a shutter (4) is provided at the bottom of the chuck part to open and close the opening of the chuck dust suction cover (2). is provided.

On the other hand, the screw (2) to be screwed into the workpiece (B) is fed by the pressure of compressed air from the screw feeder (9) to the tip of the chuck unit Z through the screw feed hose (2) shown in Fig. 6. Ru. As for this compressed air.

Clean air with dust removed by a filter is used, but dust generated in the screw feeder (9), dust attached to the screw itself, and screw feed hose (2)
In order to simultaneously send out the dust adhering to the chuck unit, air mixed with dust is inevitably released from the tip of the chuck unit so that when feeding screws, if there is a workpiece (b) directly under the chuck unit, this Dust is blown onto the workpiece (b).

In order to avoid this, when the screw (2) is supplied, this invention uses the shutter (4) as shown in FIG.
) is closed, and Fig. 8 shows the opening of the first
After the shutter (4) in the figure has moved, the chuck table (6a) is lowered by the chuck table lifting cylinder (8a), and the figure shows the state immediately before starting screw tightening work.
At this time, a space *CLI) is formed around the entire circumference between the chuck part dust suction cover (1) and the workpiece (b). Note that Figure 4 is a side view of Figure 8, with the shutter (4
) is moved by the arrow (2) by the shutter movement cylinder (8b).
).

Next, Fig. 6 is an enlarged sectional view of the chuck part dust suction cover (1) to explain the state immediately before screw tightening, and there is a t,)
If the gap is maintained and the dust is discharged from the exhaust port (4) to the outside of the clean room via the exhaust hose (c), the dust generated during screw tightening will be removed from the gap (t, ) along with the air flowing in the direction of the arrow (b),
Discharged outside the clean room. Also, while tightening the screws,
The dust generated in the screw tightening mechanism located above the chuck table (6a) is removed from the upper dust suction cover (2) shown in Figure 8.
) is discharged from the exhaust port (4) provided in the exhaust port (4).

After completing the screw tightening work as described above, use the chuck stand (
Needless to say, after raising the shutter 6a), the shutter 4 is returned to its original position as shown in FIG. 1 in preparation for the next screw tightening operation.

In the above embodiment, a screw (bolt) tightening device was described, but it goes without saying that the same effect can be achieved even when applied to a nut tightening device having a pneumatic feeder or a rivet crimping device. Nor.

〔Effect of the invention〕

As described above, according to the present invention, the screw tightening mechanism section and the chuck section are each provided with a dust suction cover, and the opening of the cover corresponding to the workpiece is used when supplying screws.
Since the shutter selectively opens and closes when tightening screws, the dust generated when supplying screws is not blown onto the workpiece, and the dust generated inside the screw tightening device and the workpiece during screw tightening is prevented. This device is extremely useful as a screw tightening device for use in a clean room because it can reliably exhaust dust generated near the screw that is inserted into the clean room through the dust suction cover and the exhaust port.

[Brief explanation of the drawing]

Figures 1 to 5 all show one embodiment of the present invention; Figure 1 is a front view showing the state when screws are being supplied, Figure 2 is a side view thereof, and Figure 8 is a screw tightening state. Front view showing the state at the time,
FIG. 4 is a side view thereof, FIG. 5 is an enlarged sectional view showing the state of dust suction during screw tightening, and FIG. 6 is a front view showing an example of a chuck mechanism used as a chuck unit. 7 and 8 are cross-sectional views showing the tip of a driver of a conventional screw suction type screw tightening device. In the figure, (1) is the chuck dust collection cover, (2) is the upper dust collection cover, (3) is the exhaust port, (4) is the shutter,
(8b) is a cylinder for moving the shutter, 0 is a screw unit, and 8b is a screw. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Claims] (1) An upper dust suction cover that covers the screw tightening function part, a chuck dust suction cover that maintains a certain gap with the workpiece during screw tightening, and an opening of the chuck dust suction cover that corresponds to the workpiece when supplying screws; A screw tightening device characterized in that a shutter that selectively opens and closes when tightening a screw, and each cover is provided with an exhaust port for discharging dust to the outside. (2) Claim 1, characterized in that the shutter is moved by a shutter moving cylinder.
Screw tightening device as described in section. (3) The screw tightening device according to claim 1, wherein the screw tightening function section is formed by a chuck unit that accommodates a rotatable and movable bit and that sucks the screw.