JPS59219169A - Suction type automatic screw tightening machine - 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] In a machine that holds the workpiece P tightening f = 1, it is especially important to suction and hold the fastener parts held in -1j, gear, and gear to tighten the work piece MY (-1 key 1"L). This invention relates to a suction type automatic screw tightening machine that short-circuits the screw tightening work cycle quim in a machine that carries the fastener parts to a workpiece and tightens them with a dry bar.

This type of screw tightening machine, which has been widely used in the past, is as shown in Figs. A-I & i: 3 is fixed, and screw 1 of non-lifter 2 is screw 1' 2 a.
The supporting part 4 is moved freely when guided.

The rear ends of two guide shafts 6l60 to which the catcher 9 is fixed are fixed via the chatter stand 5. Support shrine 4 has i-
A motor 7 containing a built-in motor 7 (not shown) is fixed, and the rotation of this motor is connected via a drive shaft 7a of the motor 7 and extends in the 1iil direction.
transmitted to.

The tip of this motor 7 covers the drive shaft 7a of the motor 7. ;) + o is fixed, and an outer cylinder 11 with a bottom that slides on the outside of the inner cylinder 10 is fitted over the inner cylinder 10. This evening 14% I]] is moved forward by a predetermined amount by the spring 12 mounted between this bottom and the motor 7.
There are 1,171 confirmed cases.

In addition, Gaisho] At the tip of 1 is h + r inscription ↑ 7 Cheer 9 Guy 1
- A guide pipe 14 to which a holding cylinder 13 which is reciprocatably inserted through the hole 9a is screwed is fixed, and this pipe 1
A guide pipe 1 is connected to the rear end of 4 from the tip of the holding cylinder 13.
A connecting pipe 15 that communicates with a suction device (not shown) that suctions air through 4 is connected. Further, a drive shaft 8 is rotatably and reciprocatably inserted into the guide pipe S, and a drive shaft 8 is connected to the tip of the drive shaft 8.

Therefore, after 1 kneading 16 times in the catcher 9, the Suffu-1 signal is input (K), and the suction device operates to start suctioning air from the tip of the holding cylinder 13. At the same time, the screw 1 and the cylinder 2 are attached to the support portion tA' 4, and the support portion is removed. Mork 7. Guy 1 pipe 14 and O/ho 1 temple tube 13 are integrated if
Then, the screw 16 inside the catch ring 9 is sucked into the holding cylinder 13 with its head backward, and the holding cylinder 13 holds the catcher 9 l'
1 cup 1. the workpiece (not shown) until it comes into contact with the workpiece (not shown). During this time, the catcher 9 moves as shown in FIG. 1, maintaining the distance between the screw 16 and the driver screw 12. In this way, after the tip of the holding cylinder ``3'' moves to a position where it approaches the workpiece, the holding cylinder ``3'' stops at the position 1 preset by the first stroke I7. Since the cylinder 2 moves forward until it comes into contact with the second I/bar 18, the motor 7 moves forward against the spring 12), and the screw 16 pushes the workpiece by the driver bit 12. When the screw tightening work is completed in this way, the lever bit 12 moves back and returns inside the holding cylinder 13, and then the holding cylinder 13 also moves back and the screw tightening work is completed. The cycle is completed.The air circuit of the suction device is switched when reversing at this point, and the air is maintained from 1η13 to t.
This prevents the screw from returning with the screwdriver bit biting (=1) when it is ejected.

However, in this screw tightening machine, the piston cylinder also serves as a reciprocating drive source for both the screw tightening unit and the driver bit, so the operating speed of this piston cylinder is determined by the driving speed during screw tightening work, that is, the moving speed of the driver bit. , screw bi.

It is not necessary to adjust the speed in advance to the speed determined from the number of rotations of the chain and the motor, and therefore, it is not possible to shorten the screw tightening work cycle time. Also, in order to shorten this screw tightening work cycle time, there is a method of using a high-speed rotating motor. , I
The adjustment of li and l becomes sloppy, making it impossible to obtain accurate 1 digit 1 -/ref. The screw was tightened to the workpiece and the screw was tightened.
In order to prevent this, the air circuit is set to let out air when the e, screw tightening unit, and l move back, but this circuit There are problems such as double contours.

The present invention solves these problems and enables accurate tightening in a short period of time.
This invention was devised for the purpose of providing a suction type automatic screw tightening machine which can perform screw tightening work with a torque of 1 and has a simple structure. Explain.

FIG. 3 shows a suction type automatic screw tightening machine. A first screw cylinder 21 as a first reciprocating drive means is fixed to the base I, and this piston cylinder 2
The screw 1 and head 21a of 1 are arranged parallel to the base 1, and both ends are treated as Louis 1. Part 1
34 has a series of X and I-. This guide I and the shaft 6 (this constitutes the screw tightening unit 20, and the motor 7 which has a built-in motor 7 (not shown) is fixed thereon) are fixed so that the guide I and the shaft 6 (hereinafter referred to as "I" and "IIy") are movably movable in the axial direction. A catcher base 5 is fixed with a catch 19 having a screw 16 at the tip of the guide shaft 6 (jaw 91 for main holding). 9
Guy 1' hole 9a) This is the 1' liver bit 12 reciprocating month 1. A holding cylinder 13 is provided so as to be freely reciprocally movable, and is freely inserted into the holding cylinder 13 and sucks air from its tip. This holding gap 13 is screwed to the tip of a guide pipe 14, and this guide pipe 14 is attached to an inner cylinder 23 which is attached to the tip of the motor 7 described in 01j. The distal end of a bottomed outer cylinder 24 which is reciprocally movable is fixed. A suction device (not shown) is provided at the rear end of the guide pipe 14 as in the conventional case.
The connecting pipe 15 that communicates with the guide via 14 is connected to the guide 1.
I'm getting lost.

Also, on the drive shaft 7 rl of the tail Tanabata 7, there is +1
．． There are two bins 25 arranged in the direction that intersects with each other.
26 in the axial direction elongated hole 26a). This j
A spring 27 is wound around the drive shaft 7+1 between the heavy viscous part 412() and the Mogua, and the connecting part IA'2G is
Hataketoki is being pushed towards fai1. The drive shaft 8 is loosely inserted into the guide pipe 14f so that it can freely rotate and reciprocate.
112 is screwed to the drive shaft 112, and the rotation from the motor 7 is transmitted to the drive shaft 112.

Also, take τ1 part 22f, which gives the moving movement along the guide axis fi & 2nd part +A22t
A second screw cylinder 28 as a return drive f-stage is fixed, and the piston port of this piston cylinder 28, door 28I3, is connected to the support member 4 (this is fixed, and the support member 4 and the other parts), and the member 22 is This second via 1 ring/ring 28 (connected by this. In this embodiment, the second piston cylinder 28 is fixed to the II part 22). The second cylinder 28 may be fixed to the support member 4e, and the piston rod 28a may be fixed to the support member 4e. This is a bar that prevents the member 4 from moving forward, and is adjustable so as to prevent the trowel support member 4 from moving forward just before the tip of the holding member 3 contacts the workpiece 30.

In this I'llY configuration, after a pair of screws 16 are held, when a start signal is input,
When air suction starts? The motor 7 starts rotating, and at the same time the first piston cylinder 2I starts moving l'lil at a preset arbitrary speed. This first piston cylinder 2+1 holds the position +13
, the motor 7 and the driver bit 12 move together, and the screw 16 in the catcher 9 is removed as shown in FIG.
Move one screw closer and hold the screw 6 in the holding gap 13 by suction. After that, it passes through the catcher 9 and advances n; J until just before it comes into contact with the holding interval 13 (j stopper 29) and stops. This first screw 1 cylinder 2J stops. Immediately, the second piston cylinder 28 moves, and the driver bit 12 moves inside the holder 13 as shown in FIG.
proceed. This driver Biyl-12#Ki4FM-+
It moves at a preset speed depending on the rotation speed of the motor 7 and the pitch of the screw I6, but the support part A4 can move at any revised speed regardless of the number of rotations of the motor 7. I can do it.

In this way, the screw 16 hits the workpiece 01,
Since the motor 17 compresses the spring 27 and moves the drive shaft 711 by one step, the bottle 25 has a hole 2 G in the connecting part IA260!
], ) Move along this line. And l liver pick 11
2 is still the holding cylinder 1 from the second piston cylinder 28t.
Move forward while rotating inside the workpiece 30 [tighten the screw 16]. After this, the motor rotates l゛: (1!:
The first screw 1 and cylinder 21 appear to be leaving the table.
1 and 12 retreat into the catcher 9 with their tips protruding from the holding cylinder 13. Therefore, even if the screw 16 that could not be inserted into the workpiece 30 for some reason returns to the tip of the driver screw 1]2, it will be removed by υl by 9-9υ. Thereafter, the second biston cylinder 28 also retreats and returns to its original position, completing the tightening 11 cycle.

This embodiment is a screw tightening machine that uses a screwdriver attached to the tip of the arm of an industrial robot, I-, which is currently widely used for assembly work, but in place of this, the present invention It can be used in conjunction with Sumimeiso, a stationary automatic screwdriver that has been widely used in the past.

1 - As is clear from the embodiments described, the present invention includes a holding cylinder 13 that suction-holds a screw 16 from a catcher 9 that holds one screw I6 at a time, and is movable reciprocally within the catcher 9, and this screw 16. The screwdriver bit 120 consisting of the 7-77 screwdriver bit 12 that transmits the rotation to the screwdriver bit 12 which acts on the screwdriver, and the base 11 are fixed, giving reciprocating motion to the screwdriver unit 20 and doing this. A first multi-driving means supported, and this first drive means. ] The motor 7 and driver bit 12 of the old screw tightening unit 120 are connected to the return drive means and can be moved integrally with the screw tightening unit 12°.
and a second reciprocating drive means which is arranged in line with the holding part 13 and supports it so as to be reciprocally movable.

For this reason, the holding cylinder of screw tightening unit 1 is
Regardless of the movement speed of the motor, the preset screw tightening speed e from the relationship between the motor's width and the screw's width and width, the tip of the holding cylinder is warped from the work starting position. Since the speed of the screw tightening unit 1 can be made faster during the position just before contact, the cycle time of the screw tightening operation can be shortened. , and the structure is mI4+ since the holding cylinder and the driver/beam/1 are simply moved independently. Even if you shorten the kneading and tightening work cycle time, if you are tightening a screw on the workpiece by 1 time, the speed of Dry Vibration 1 will correspond to the speed of the screw, so you can get a reliable tightening torque of 1. It will be done. Also, in this Example 1, the screw is screwed with a screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, screwdriver, etc. There are times when the fish moves backwards and returns into the catcher while it is still there, but this is because the operation of the first reciprocating drive means slows down the second if double-drive f stage that moves the liver pit, causing a delay. To control? Since this can be prevented, there is no need to temporarily discharge the air from the holding cylinder when the screw tightening unit retreats, and the air circuit for attracting the screws can be simplified. .

[Brief explanation of drawings]

Fig. 1 is a front view with a cross section of the main part of a conventional suction type automatic screw tightening machine, Fig. 2 is a plan view of the main part of Fig. 1, and Fig. 3 is a suction type automatic screw tightening machine as an embodiment of the present invention. A front view showing a cross section of the main parts of the machine, FIGS. 4(a) and 4(b) show the relationship between the catcher, holding cylinder, and pinot 1 in the suction type automatic screw tightening machine of the present invention. This is a diagram of the operation of tightening the screws shown. 1 is the base, 3 is the take-out plate, 4 is the support part, 6 is the shaft of the guy, 7 is the motor,
8 is a drive shaft, 9 is a catcher, 9a is a guy I hole, 13 is a holding cylinder, I4 is a guy 1 pipe, 16 is a screw, 20 is a screw tightening unit, 21 is a first piston cylinder, 22 is a Board: 1st month, 23 is inner letter, 24 is outer letter
27 is a spring, 28 is a second piston cylinder, 29 is a collar, 30 is a workpiece, Patent applicant Nitto Seiko Co., Ltd.

Claims (1)

[Claims] A retainer h'rr,' which attracts and holds the screw 16 held in the A-1, 7-chip 19 and can freely reciprocate within the catcher 9.
I) I: U and this holding 1 ftl], screw 1 in 3
A screw tightening unit 120 consisting of a morph 7 connected to give rotation to a 1-20 pin acting on a base 11 and a screw unit 1-20
child? A J-th reciprocating drive means 120 is connected to the J-th reciprocating drive means 120, which both support the J-th reciprocating drive which gives a "reciprocating action f'+=", and the J-th reciprocating drive means 120 is connected to the Tighten it, write I's Mo 17 and Driver Pit 1-12, and make a note 13.
(A suction type 1-1 movable twisting machine characterized by comprising a second reciprocating drive means for independently reciprocating the screw 1.