JPS63123641A - Screw fastening device - Google Patents

Abstract

PURPOSE:To prevent scatter of dust by furnishing a suction pipe, which is installed with capability of advancing and retracting toward/from the bottom of a screw fastening machine and which includes an opening facing the undersurface of the screw fastening machine, and a vacuum pump which is connected through piping to said suction pipe. CONSTITUTION:A vacuum pump 33 is driven to such air from driver cases 26, 30, while air is also sucked from the oversurface of a suction pipe 41 and notch portion 41a. When one screw S sent under guidance of a guide 12 comes into a selector valve 14, pressure air from a pressure source 15 sends the screw S by pressure. The screw S passes an air shooter 11 and is grasped by a chuck 32 while taking specified attitude. At this time, air containing dust is blown off from the chuck 32 downwards, wherein the amount of blowing-off is sufficiently small compared with the amount of suction of the abovementioned suction pipe 41. Accordingly the air with dust blown off from the chuck is mostly sucked from the suction pipe 41 to be then released out of the clean room.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a screw tightening device using a screw tightening machine that pumps screws with air, and particularly relates to one that is effective for use in a clean room. .

(Prior art and its problems) Conventionally, when using a screw tightening machine in a clean room, a machine that pumps screws with air releases dust, so a machine that pumps air is not used. The method used is to grasp the next screw with a claw after positioning it, transport it to the working position, and then tighten the screw. However, with this method, the work of gripping and transporting the screw is added, making the structure complicated and the operation difficult. It also becomes complicated and work efficiency cannot be improved.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and provides a screw tightening machine with a simple structure and good work efficiency, which enables the use of a screw tightening machine that pumps screws with air without any trouble in a clean room. The aim is to provide the equipment.

(Detailed Description of the Invention) In order to simplify the structure of the screw tightening device and improve work efficiency by using a screw tightening machine that pumps screws with air in a clean room, it is necessary to This invention requires a suction pipe to be moved forward and backward toward the bottom of the screw-driving machine from which air is blown out, and when the screw is being pressure-fed with air, the suction pipe is placed at the bottom of the screw-driving machine. The device is designed to prevent lumps from dispersing by forcing air to be sucked out.

(Example) In this example, a case will be described in which a screw tightening machine SD that pumps a screw S using air is installed as an end effector of a Cartesian coordinate robot RB with three degrees of freedom. It is not limited to.

1 is the pace of the robot RB, and this pace 1 is provided with a horizontal guide 2 in the X direction. Further, a movable body 8 is slidably supported on the guide 2, and this movable body 3 has a Y
A horizontal arm 4 is supported so as to be slidable in the direction. Furthermore, a vertical arm 5 is supported at the tip of the horizontal arm 4 so as to be slidable in two directions.

OF, on which the screw tightening machine SD is supported by the vertical arm 5, is a screw S supply device and is installed at the pace 1. The feeding device F includes a guide 12 that guides the screw S carried out from a known feeder (not shown) to the base end of the air shooter 11, and a guide 12 that guides the screw S carried out from a known feeder (not shown) to the base end of the air shooter 11.
The switching valve device 14, the details of which are not shown, is built into a connecting portion 18 with the base end portion of the switching valve device 1.

A pressure source 15 is connected to the piping 1 on the upstream side of the switching valve device 14.
6 has been done.

The SD is attached to the support member (lower part of the vertical arm 5) using a second screw tightening machine, and is installed in the vertical direction. Reference numeral 21 denotes its main body, and a vertically movable rod 22 is inserted into this main body 21, and is urged downward by the force of a lever spring 23.

Further, a stopper 24 is provided at the upper end of the rod 22, and a dog 25 facing the stopper 24 is provided on the main body 21 so as to be freely adjustable. Reference numeral 26 designates an upper driver case that is fitted onto the rod 22 and attached to the main body 21 and is movable up and down by a telescopic actuator A. A motor 27 is provided upright at the upper end of the upper driver case. Reference numeral 28 denotes a driver connected to the output shaft of the motor 27, supported by the upper driver case 26 so as to be vertically movable, and urged downward by the force of the cover spring 29. A lower driver case 80 is provided integrally with the lower end of the rod 22, and is provided to be vertically slidable with respect to the upper driver case 26.

And between both driver cases 26 and 80 is a bellows 3.
Covered by 1. Reference numeral 82 denotes a chuck part integrated at the lower end of the lower driver case 30, and this chuck part 32
The tip of the air shooter 11 is connected to. Further, an opening 26a is provided on the side of the upper driver case 26,
A vacuum pump 38 is connected to a pipe 84 in this opening 26a.

Reference numeral 41 denotes a suction pipe that is provided so as to be movable forward and backward toward the lower part (chuck part 32) of the screw tightening machine SD, and has an opening facing the lower surface of the chuck part 82.

The suction pipe 41 of this embodiment is vertically supported 48 on a member 42 protruding from the lower end of the vertical arm 5, and the rotary actuator 4
4 is connected to the distal end of a rotatable horizontal tube 45. The continuous connection point is the lower end of the suction pipe 41. The base end side of the horizontal pipe 45 is connected to a vacuum pump 88 via piping 46. Further, on one side of the suction pipe 41, the suction pipe 41
A notch 41a is formed through which the lower part of the screw tightening machine SD can pass during rotation.

Note that the amount of suction from the suction pipe 41 is set to be sufficiently larger than the amount of discharge from the pressure source 15 blown out from the chuck portion 32 .

Furthermore, the operation of this embodiment will be described.

This winter's configuration is assumed to be at the solid line position shown in the diagram. That is, the suction pipe 41 exists at the bottom of the screw tightening machine SD, and the
8 is in a position where the screw S can be received into the chuck portion 32.

Therefore, the vacuum pump is driven and both driver cases 26.8
In addition to suctioning the air inside 0, air is also suctioned from the upper surface of the suction pipe 41 and the notch 41a.

Then, the screw S guided by the guide 12
When one is in the switching valve device 14, the switching valve is switched and the screw S is force-fed by pressure air from the pressure source 15. The screw S passes through the air cinerator 11 and is gripped by the chuck part 32 in a predetermined posture. At this time, the chuck part 3
Air containing dust is blown downward from 2, but the amount of air blown out is sufficiently small compared to the amount of suction from the suction pipe 41. Therefore, the dust-containing air blown out from the chuck part 82 is mostly sucked through the suction pipe 41, and is appropriately discharged outside the IJ-room or sent into the clean room via a high-performance filter.

Therefore, there is little chance of dust scattering inside the clean room.

Next, the rotary actuator 44 is driven so that the suction pipe 41
is retracted to the position indicated by the two-dot chain line in FIG.

In addition, by driving each control axis of the robot) RB, the screw tightening machine SD
is positioned above the female thread of the workpiece (not shown). Then, while extending the telescopic actuator A, the motor 27 is driven and the driver 28 is rotated. Then stopper 2
4 comes into contact with the dog 25, the upper driver case 2
6 and the rod 22 are lowered together. The stopper 2
4 and the dog 25, the lower surface of the chuck portion 82 is located slightly above the upper surface of the workpiece (not shown). After that, only the upper driver case 26 descends, so the lower driver case 80 is stored in the upper driver case 26, and as a result, the driver 28 presses the head of the screw S of the chuck part 82 by the force of the spring 29. , the screw S is rotated by the motor 27 and is about to be advanced, but is sent into the clean room from the opening 26a via a vacuum bomb or a high-performance filter. Therefore, there is no benefit in having the dust scattered inside the clean room.

The above description is an example, and for example, the suction pipe 41 is the member 42.
The notch 41a may be eliminated by horizontally supporting the suction pipe 41 horizontally, or the suction pipe 41 may be movable in the left-right direction in FIG. It goes without saying that the technical scope of the present invention also includes the replacement of each component with equivalents.

(Effects of the Invention) As mentioned above, when the screw S is fed under pressure with air, the suction pipe 41 is positioned at the bottom of the screw tightening machine SD to suck the air blown out from the screw tightening machine SD. As a result, there is no risk of dust scattering outside, and the device of the present invention can be fully used in a clean room. Therefore, the structure is simpler and the work efficiency is improved compared to the conventional device in which the screw S, which has been positioned in advance at a predetermined supply position, is grasped with a claw and transferred to the working position to tighten the screw.

[Brief explanation of the drawing]

The figures all show embodiments of the present invention; FIG. 1 is an overall explanatory diagram, FIG. 2 is a view taken along the ■-■ arrow in FIG. 1, and FIG. 8 is a view taken along the ■-■ arrow in FIG. be. SD... Screw tightening machine, 5... Support member (lower part of vertical arm), 88... Vacuum pump, 41... Suction pipe, 41
a... Notch, 48... Vertical axis.

Claims (4)

[Claims] (1) A vertical screw tightening machine that is attached to a support member and uses air to force-feed screws, and a vertical screw tightening machine that is movable toward the bottom of the screw tightening machine and has an opening facing the bottom surface of the screw tightening machine. A screw tightening device comprising a suction pipe having a section and a vacuum pump connected to the suction pipe. (2) The screw tightening device according to claim 1, wherein the suction pipe is pivotably supported to move forward and backward. (3) The screw tightening device according to claim 1, wherein the suction pipe is supported so as to be linearly movable so that the suction pipe can move forward and backward. (4) The screw tightening device according to claim 1, wherein the suction pipe is formed with a notch through which the lower part of the screw tightening machine can pass when the suction pipe moves back and forth.