JPS58186539A - Screw tightening work unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw tightening work unit configured to prevent double screws.

Conventionally, when screwing the screw held at the tip of the chuck unit 1 into the mating material using a driver pitch meter, there are cases where the screw is defective or
Due to a defect in the pilot hole of the mating material, etc., the screw is not screwed into the mating material, remains in the chuck unit, and may overlap with the screw supplied for the next screw tightening operation. Therefore, a problem arises in that it is difficult to perform the next screw tightening operation. To solve this problem, a screw tightening device as shown in FIG. 3 has been devised. This screw tightening device surface is connected to the drive source (7
The rotation from 1 is received by the first cylinder's screw measuring rod (
a driver pin rI that moves up and down together with the piston rod (441), a chuck unit that includes the driver pin (441) and holds a screw at its tip; Chuck play 1 (C and chuck play 1 (
4z and a second cylinder that raises the chuck unit (support) relative to the driver bit ■.
After the cylinder (6) is activated and the screw tightening work is completed, the second cylinder (6) is activated.

The driver pin r■ is made to protrude from the chuck unit 1■, and the screw inside the chuck unit is ejected. In this screw tightening device, in order to make the driver pit ■ protrude from the chuck unit, there is a second cylinder in addition to the first cylinder 143I.
The cylinder (c) is required, which only increases the cost of the device.However, since the first cylinder (port) must be returned to its original position after the second cylinder (6) has completed its operation, the operation time of the second cylinder (451) only increases. There are drawbacks such as increased cycle time.

The present invention aims to eliminate the above drawbacks.

Examples will be described below with reference to the drawings. In FIGS. 1 and 2, 11) is a support arm numbered at the tip of a work arm (not shown) of an industrial robot (not shown), and this support arm Il+ has a driver main body (2). is fixed. The driver main body (2) includes an upper bracket +31, a lower bracket +41 and a housing 1.
5), and this housing 15) has a European fitting part (
A driving source (7) is fixed via the screw 6). This drive source (7) has an upwardly extending drive shaft (8), and a first boom is attached to this drive shaft (8). +191.

I! A rotating shaft α3 is connected via a belt mechanism α2 consisting of two pulleys and a timing belt αυ,
The belt mechanism O2 has a tension adjustment device Qe consisting of a cam follower I and a mounting lever decoy, and also has a storage portion (6).
It is covered by a cover 〇η attached to the.

On the other hand, the upper bracket (31) of the driver body (2)
A lower bracket F (41) is fixed to the upper bracket F (41), and a stepped cylinder αe having a piston portion at the upper part is slidably inserted into the upper bracket (3) and the lower bracket F (4). 31 is the first supply/discharge port Q
9 and a second supply/discharge port (■) are bored, and by supplying and discharging air from the first supply/discharge port α and the second supply/discharge port (■), the stepped cylinder Ql is raised and lowered. is configured to rise faster than the rise of the At the bottom of the stepped cylinder 081, a chuck support is rotatably held, and a chuck unit ■ is fixed to the tip of the chuck support, which allows the stepped cylinder 081 to move up and down. Accordingly, the chuck unit F22) is also configured to move up and down together.

A piston is inserted into the stepped cylinder (181) through a sliding groove, and a connecting shaft is integrally attached to the piston so that it can move up and down and rotate freely.The connecting shaft The second part of the sleeve includes a spline shirt F rotatably held in the housing (5).
is inserted through the shaft, thereby forming a transmission mechanism that transmits the rotation applied from the rotating shaft f13 to the connecting shaft (to) regardless of the position of the connecting shaft α.

Is the tip of the articulated shirt Fc141 the chuck support? Located at C111 yen, this chuck sabot F C1
A spring retainer ■ that slides within 1 liter is fixed to the tip of the Renkō shaft [Co., Ltd.]. Moreover, the first spring ■ is located between the spring receiver (a) of the piston and the chuck support.
A second spring (support) is inserted between the locking part ■ of F C8l+, and the gap between this first spring is the chuck sensor g-)
It is configured so that 211 yen can be passed through.

Furthermore, a driver pin [■] is fixed to the tip of the connecting shaft in a meticulous manner.

P? The tip of the rcn is movably guided within the chuck unit (2). The articulated shirt r (24
The tip of 1 also serves as a detection part of a proximity switch 3D attached to the tip of the chuck support, and is configured to detect the lowered position of the tip of driver bit 3.

A chuck height adjustment device GZ and a chuck posture control device (to) are independently rotatably held at the lower part of the lower bucket 1 (4). The chuck height adjusting device (■) consists of a 37"-relief □□□ which is rotatably held on the outer periphery of the lower bracket (4), a height adjusting ring can which rotates together with this, a stopper ring (■), and a stopper ring ( To)
It consists of a pin support fixed to the. Further, the chuck posture control device (2) includes a rotary link rotatably held on the outer periphery of the lower 1F racket (4) below the chuck height adjustment device (2), and a fourth boot U Gl that rotates integrally with this.
It consists of Further, the rotary link is attached to the Chasuku Sabo FQU by a screw boat so that it can rotate freely together with the Chasoku Sabo 12Il and the Chasoku Sabo P til+ can be raised and lowered freely.

In the screw tightening work unit, the drive source i11 is driven to transmit the rotation of the drive shaft (8) to the rotary shaft and further to the spline shirt F via the bell meter mechanism OXI. After that, the first supply/discharge port Q! When air is supplied from J, the stepped cylinder 081 descends together with the chuck unit 1G. The stepped cylinder U8 descends, and its stepped portion comes into contact with the stub ring can whose height is determined by the height adjustment ring (to) and the bottle (9), and stops once, thus the chuck unit ■
will also stop at the same time. Furthermore, when the supply of air from the air supply/discharge port a9 is continued, the screw (n) descends within 0 seconds of the stepped cylinder, and at the same time, the articulated shirt meter (to) also rotates from the spline shirt rc151. 2. It descends against the spring ■.Instead, the driver pin rcn descends inside the chuck unit F@.

It comes into contact with a screw (not shown) held at the tip and is screwed into the mating material.

After tightening the screws, supply air from the second supply/discharge port ■, and
When air is discharged from the supply/discharge port α, the first stage cylinder αε rises. At the same time, Chuck Units IQ2 also increases. On the other hand, since the screw 1 returns upward at the speed at which the second spring ■ returns, the driver bit ω and the original driver bit ■ return to their original position in the chuck unit @ in the upper row, and the dobypa bit tcBdf It once protrudes from the Yake unit n. Then return to position.

Therefore, even if a screw tightening failure occurs during screw tightening work and the screw remains in the chuck unit F, the screw is removed from the chuck unit F by the protrusion of the driver pin [clO from the chuck unit 10.

? As explained above, the present invention incorporates a two-stage cylinder mechanism in the driver body, and moves the chuck unit [by raising and lowering the first stage], and moves the driver bit together by raising and lowering the second stage. Since the configuration is such that the lifting and lowering of the second stage is performed by air, and the raising of the second stage is performed by the return of the spring, not only is no extra lifting means required when protruding the driver pin 1 from the chuck unit, but
The projecting operation of the driver bit M can be performed during the operation of returning the driver bit to its original position, which has the advantage of shortening the cycle time. Furthermore, since the present invention is extremely compact and lightweight, it has the advantage that it can be used as a tip unit of a working arm of an industrial robot.

[Brief explanation of the drawing]

, FIG. 1 is a partially cutaway front view of the present tlq, FIG. 2 is a sectional view of the main part of FIG. 1, and FIG. 3 is a partially cutaway front view of a conventional example. 11) Support arm, (2) Driver body. (31 Upper bracket, (4) Lower bracket. 15) Housing, (61 Mounting part. (7) Drive source, (8) Drive shaft. +91%) I pulley, 2nd pulley. 1111J iming/L7 total, QZ Pell 1 mechanism. +131 Rotating shaft, round cam follower, (
151 Mounting lever, 06) Tension adjustment device. (17+ Cover, α mark Stepped cylinder. u9th] Supply/discharge O, C1l 2nd supply/discharge port. 2+1 Chuck sabot meter, ■ Chuck unit 231 Piston, Koji connecting shaft, 2
51 Spline shaft, enclosure] Spring holder, holder 1st spring, holder locking part,
■ 2nd spring, ■ Dry pin F, O1l
Proximity switch. GZ Chuck height adjustment device, East Chuck posture control device, -1 3rd pulley, (G) Height adjustment ring ■l Stopper ring, Position bottle. ■ Rotating ring, ■ 41st-ri, (and others)
J, l Screw tightening device L (421 chuck plate, 1st cylinder. f441 Histone rod, +45+ 2nd cylinder, patent applicant Nitto Seiko Co., Ltd. Fig. 1 Fig. 2 Fig. 3 Fig. 5

Claims (1)

[Claims] A driver body (2) and a drive source (7) are provided integrally, and a Dophy Pavit can that rotates by receiving rotation from the drive source (7) can be freely rotated with respect to the driver body (2). established in
When this driver pin 1ω is included, a screw tightening work unit having a chuck unit for holding a screw at the tip thereof is used. Insert the cylinder body that moves into the chuck unit FG into the driver body (2), and connect the doubibabitsu gauge with a 9'4'' rotational position while slidingly guiding the screw 1 into the 1 cylinder body. Then, the drive source (7) moves integrally with this piston and connects it to the fiber bit field.
A transmission mechanism is connected to which the rotation of the piston is constantly transmitted, and a spring is arranged in a direction that always biases the piston toward a dual point. A screw tightening work unit characterized in that the cylinder body is raised and lowered and the piston 0 is lowered by air, and the piston is returned to the top dead center by a spring.