JPH06218640A - Suction holding type screw tightening device - Google Patents

Abstract

PURPOSE:To improve the efficiency in the assembling work for fixing a plate shaped member on a installation objective article by a screw CONSTITUTION:An absorbing holding type screw tightening device is equipped with an air control means which is connected with an air flow passage 3 having an opened port 13c directed to a plate shaped member 9 side in the vicinity of the top edge part 18a of a driver 4 and permits the head part 6a of a screw 6 to be absorption-held on the top edge part 18a of the driver 4 and sends out air to the opened port 13c through selection, shifting means for shifting the driver 4 and a screw holding member 5 up to an insertion hole 9a on the plate shaped member 9 from the holding position for the screw 6, and a control means which carries out the control for selecting the air control means to the air feeding side at the time point when the screw 6 is set close to the insertion hole 9a and screwing the screw 6 into the tapped hole 8a on an installation objective article 7 from the insertion hole 9a by the driver 4, by releasing the screw holding by the screw holding means 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of assembly technology for assembling a board on which electronic parts are mounted in a main body of an electric device, and more specifically, by adsorbing a screw to the main body side through an insertion hole on the board side The invention relates to a suction-holding type screw tightening device for fixing a substrate in a main body by screwing the substrate into the screw hole.

[0002]

2. Description of the Related Art In the process of assembling various electric devices,
When the electronic parts are built in the main body case of the electric device, it is general that a board on which a large number of electronic parts are mounted is arranged in the main body case and fixed with screws.
Although the work of fixing this board is performed by an automatic assembly device, it usually corresponds to the screw holes of the main body case provided at the time of molding processing, and several screw insertion holes are formed on the board side using an electric drill etc. There is.

When fixing a board of this type to a main body case 7 of a communication device, such as a facsimile, a screw insertion hole 9a is formed in a screw hole 8a of a pillar 8 standing on the main body case 7 as shown in FIG. Substrate 9 and body case 7 so that they match
To place. Then, the tapping screw 6 is inserted into the screw insertion hole 9a and screwed into the screw hole 8a, so that the board 9 is assembled in the main body case 7 through the tapping screw 6.

As a screw tightening device employed for such an assembling work of the substrate 9, a suction holding type screw tightening device 10 shown in FIG. 1 is known. This suction-holding type screw tightening device 10
Is attached to an automatic assembly device (not shown), and this automatic assembly device moves the screw fastener main body 2 to a predetermined position together with a mounting portion on which the main body case 7 is mounted.
Equipped with a Y-table, tapping screw 6 is attached to the screw fastener body 2
It is equipped with a screw feeder that feeds to the side.

Further, this automatic assembly apparatus is provided with a main control section for controlling the operation of the entire apparatus, and when a driving operation is performed by the operation panel, the main control section sends a control signal to each section, The drive of the XY table is controlled to move the screw tightening tool body 2 of the suction-holding type screw tightening device 10 from the screw holding position to the screw tightening position. Further, the suction-holding type screw tightening device 10 is operated to screw the tapping screw 6 from the screw insertion hole 9a of the substrate 9 into the screw hole 8a of the main body case 7, thereby fixing the substrate 9. There is.

The suction-holding type screw tightening device 10 includes a screw tightening device main body 2 provided with a driver 4 and a screw holding portion 5.
It is designed to move up and down by a cylinder. Also,
The driver 4 and the screw holding portion 5 are provided with an air compressor that detachably holds the tapping screw 6.

The screw fastener main body 2 is composed of an outer cylinder 11 and an inner cylinder 12 and is provided with a movable cylinder 13 constituting a screw holding portion 5. The outer cylinder 11 has a large diameter on the upper side 11a and a lower side 11b.
Is a step portion with a small outer diameter and different diameter, and is fixed to the tip of an arm provided on the XY table. The connection port 14 is provided on one side wall of the upper side 11a and the lower side 11a.
As shown in FIG. 5, screw outlets 15 are formed in b.

The inner cylinder 12 accommodates the spring 2a between the top surface and the movable cylinder 13 and is fitted to the upper side 11a of the outer cylinder 11, and the movable cylinder 13 is moved from the lower side 11b of the outer cylinder 11. A pressing force is applied to cause the required width to project. The movable cylinder 13 has a valve portion 13a at the upper end, and a communication hole 13b is formed near the valve portion 13a. The movable cylinder 13 has an inner diameter slightly larger than the head portion 6a of the tapping screw 6, the tapping screw 6 can be housed in the lower opening 13c, and the tip is tapered.

The air flow passage 3 is formed by a hollow portion 3a between the outer cylinder 11 and the inner cylinder 12 and a hollow hole 3b extending through the communication hole 13b to the lower opening 13c of the movable cylinder 13 and connected to the hollow portion 3a. The port 14 is connected to the air compressor via a connecting pipe 40. Then, when the air compressor operates, the air in the lower opening 13c, which is the opening side of the air flow passage 3 facing the substrate 9 side, is sucked.

The screw outlet 15 is a pipe 16
Is connected to a screw feeder (not shown), and the tip is directed to the central portion when the gripping claw 19 described later converges. Therefore, when the tapping screw 6 sent from the screw feeder is discharged from the screw outlet 15, the gripping claw 19
It can be held by dropping to the side.

The driver 4 includes a main body 17 and a shaft 18.
The main body 17 is connected to the upper portion of the inner cylinder 12. Then, the shaft 18 is accommodated in the movable cylinder 13, so that the tip portion 18a for the + screw is moved to the movable cylinder 1.
It faces the bottom edge of 3. This driver 4 has a grip claw 1
When 9 moves to the substrate 9 side after holding the tapping screw 6, the tip portion 18a is engaged with the head portion 6a of the tapping screw 6. In addition, in the main body portion 17 of the driver 4,
A torque sensor is provided, and when the tapping screw 6 is screwed into the screw hole 8a to increase the torque, a signal indicating that the screw tightening is completed is output.

The screw holding portion 5 is a chuck mechanism,
It is provided with four gripping claws 19 having a substantially V shape. The base end side of the grip claw 19 is rotatably supported by a supporting portion 5a provided on the outer peripheral surface of the lower side 11b of the outer cylinder 11 so as to project. Also, the other end of the compression spring 5b, one end of which is locked to the outer peripheral surface, is locked to the base end side, and the pressing force is urged so that the tips of the gripping claws 19 converge in the axial direction. ing.

An inclined surface is provided at the tip of each of the gripping claws 19, and when the four pieces are converged, a cylindrical portion is formed by the inclined surface, and the tapping screw 6 that has fallen into this cylindrical portion can be gripped. It is like this. In addition, this grip claw 1
9 is a tapping screw 6 with the driver 4 at the upper limit position.
When the movable cylinder 13 and the shaft 18 are received, the lower side 1
It is accommodated in the opening of 1b, and the gripping claw 19 is brought into a converged state by the elastic force of the compression spring 5b. On the other hand, when the driver 4 is at the lower limit position and the movable cylinder 13 and the shaft 18 are at the lower side 11
When protruding from b, the gripping claw 19 is expanded by the tip of the movable cylinder 13 and the tapping screw 6 is dropped.

The timing for releasing the grip of the tapping screw 6 is set at a position where the tip of the movable barrel 13 comes closest to the substrate 9 and the tapping screw 6 is dropped into the insertion hole 9a. There is. At this time, even if the tip of the movable cylinder 13 comes into contact with the substrate 9, the spring 2a housed in the inner cylinder 12 contracts and absorbs the shock, so that the screw fastener body 2 is prevented from being damaged. ing.

The cylinder is attached to an XY table, and the screw fastener main body 2 is screwed from the receiving position of the tapping screw 6 based on a signal from a sensor which detects the upper limit position and the lower limit position of the driver 4. Move it back and forth to the entry position.

Next, the operation of the suction-holding type screw tightening device will be described. First, when the operator activates the automatic assembling apparatus, the main body case 7 accommodating the substrate 9 is carried in and mounted on the mounting portion on the base.

Next, the XY table is driven to move onto the main body case 7 and positioned at the first screw tightening location. At this time, the screw feeder operates and one tapping screw 6 is fed to the screw fastener main body 2. Further, the compressor operates, and the lower opening 1 is opened via the air flow passage 3.
Air on the side of 3c and the screw holding portion 5 is sucked.

At this time, since the movable cylinder 13 and the shaft 18 of the driver 4 are housed in the opening of the lower side 11b of the inner cylinder 12 and the driver 4 is at the upper limit position, the grip claws 19 are in a converged state. There is. Therefore, when the tapping screw 6 is delivered, the head 6a of the tapping screw 6 is gripped by the grip claw 19 and the screw portion 6b is held in a protruding state. At this time, the head portion 6a of the tapping screw 6 is engaged with the tip portion 18a of the shaft 18 by suction of air.

Subsequently, the cylinder is driven to lower the driver 4 and rotate the tapping screw 6. Then, when the screw portion 6b of the tapping screw 6 descends to a position facing the screw insertion hole 9a of the substrate 9 and the tip of the movable barrel 13 comes closest to the substrate 9, the movable barrel 13 and the shaft 18 are moved.
And project. Then, as shown in FIG. 4, the tip of the movable cylinder 13 pushes and widens the grip claws 19, so that the holding of the tapping screw 6 is released and the tapping screw 6 is inserted into the screw insertion hole 9a.

Then, the tapping screw 6 is screwed into the screw hole 8a by the shaft 18 of the rotating driver 4. At this time, when the tapping screw 6 is screwed in to increase the torque, the screw tightening is stopped and the driver 4 starts moving upward.

After that, when the driver 4 moves to the uppermost position, the next tapping screw 6 is fed from the screw feeder to the screw fastener main body 2. When the gripping claw 19 of the screw holding portion 5 receives the tapping screw 6, the XY table moves to the next screw tightening location and is positioned, and then the driver 4 descends to tighten the screw. When all the screws are tightened,
The main body case 7 is carried out, the next main body case 7 is carried in, and the assembling work of the substrate 9 is continued.

[0022]

In the conventional suction-holding type screw tightening device 10, the tapping screw 6 is sucked by the tip portion 18a of the driver 4 while being held by the gripping claws 19 of the screw holding portion 5. Therefore, the air on the lower opening 13c side of the air flow passage 3 is constantly sucked. Therefore, when the lower opening 13c and the tip of the movable cylinder 13 are closest to the substrate 9, the dust adhering to the upper surface of the substrate 9 is sucked in, and the dust is moved from the gap between the movable cylinder 13 and the inner cylinder 12 or the air flow passage 3. There has been a problem that the operation of the movable cylinder 13 is deteriorated by entering the valve portion 13b of the cylinder 13 and the like.

When the tapping screw 6 is screwed in, when the screw hole 8a on the main body case 7 side and the screw insertion hole 9a of the substrate 9 are placed with a slight misalignment.
May be inserted in an inclined state. Then, the tapping screw 6 is forcibly screwed into the screw insertion hole 9a.
The edge of the opening is scraped to generate shavings, which move to the upper surface side of the substrate 9 or remain in the screw insertion hole 9a. Since the shavings are sucked into the gaps and the air flow passages 3 like dust, they cause clogging that reduces the operation of the movable cylinder 13.

When the movement of the movable cylinder 13 becomes poor due to such clogging, the grasping claw 19 is pushed out to drop the tapping screw 6 and the timing for inserting the tapping screw 6 into the screw insertion hole 9a is delayed. Then, after the tapping screw 6 is tightened, a time difference occurs in receiving the next tapping screw 6, and when the gripping claws 19 are not completely converged, the tapping screw 6 is fed from the screw feeder. The tapping screw 6 discharged from the outlet 15 is grasped by the claw 19
Was unable to catch and was falling.

When the tapping screw 6 drops, not only cannot tighten the screw to fix the substrate 9 to the main body case 7, but also the work must be temporarily stopped to disassemble the screw fastener main body 2 to clean each part. There was a problem that the work efficiency was significantly reduced. Further, in order to avoid the problem that dust and shavings are clogged, it is necessary to periodically disassemble and clean the screw fastener main body 2, and there is also a problem that maintenance becomes troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a problem that dust or chips enter a movable portion such as a screw holding means to cause inoperability, and to screw a plate-shaped member with a screw. An object of the present invention is to provide a suction-holding type screw tightening device that can improve the efficiency of the assembling work for fixing.

[0027]

In order to achieve the above object, the present invention provides a driver for screwing a screw into a screw hole provided in an object to be attached through an insertion hole formed in a plate-shaped member, The screw holding means is disposed on the tip end side of the driver and detachably holds the screw, and is connected to an air flow passage having an opening directed to the plate-like member side near the tip end of the driver, and the opening is provided. Side air is sucked and the head of the screw is sucked and held by the tip of the driver, while air control means for sending air to the opening side by switching, and insertion from the holding position of the screw into the insertion hole. A moving means for moving the driver and the screw holding means to a position, and a head of the screw held by the screw holding means, and the air control means is switched to the intake side so that the tip of the driver The screw is sucked and held by the driver, the moving means is driven to move to the screw insertion position, and when the screw is exposed to the insertion hole, the air control means is switched to the air supply side, and the screw of the screw holding means is screwed. A control means for releasing the holding and controlling the screwing of the screw into the screw hole from the insertion hole by the driver is provided.

[0028]

When the plate-shaped member is fixed to the object to be mounted by the suction holding type screw tightening device of the present invention, first, at the screw holding position, the screw holding means arranged on the tip end side of the driver is the head of the screw. Hold. Then, when the air control means is switched to the intake side to suck the air on the opening side of the air flow passage, the screw holding means holds the screw,
The head of the screw is attracted to the tip of the driver. Then,
The threaded portion projects from the tip of the driver.

Next, the moving means is driven to move the driver and the screw holding means to the screw insertion position to position the screw tightening (at this position, the screw hole of the object to be attached and the plate member are inserted in advance). It is supposed to match the hole). Then, when the screw faces the insertion hole, the air control means is switched to the air supply side and the screw holding means releases the screw. Then, air is blown out from the opening side facing the plate member near the tip of the driver, and dust and the like attached to the surface of the plate member are blown off. Further, since the screw faces the insertion hole, the screw portion of the screw is inserted into the opening of the insertion hole.

At this time, when the tip portion of the driver is rotated, the screw portion is screwed into the screw hole through the insertion hole. Here, if the insertion hole and the screw hole are slightly misaligned or the center of the insertion hole and the axis of the driver are not aligned, the screw is screwed in an inclined state. . Then, the screw is forcibly screwed in, so that the peripheral edge of the opening of the insertion hole is scraped off, or the inner peripheral surfaces of the insertion hole and the screw hole are scraped to generate shavings. When the shavings are discharged to the surface side of the plate-shaped member as the screw is screwed in, the shavings are blown off by the air blown from the opening side. Further, the shavings remaining in the screw holes and the like are discharged to the side opposite to the screw holding means.

Therefore, shavings, dust, and the like are not sucked into the screw holding means side, so that the movable portion of the screw holding means is not clogged, and between the tip of the driver and the screw holding means. Will not adhere to. Therefore,
Operational troubles when the screw holding means holds the screw or releases the holding is avoided, and a problem that the timing of holding the screw at the screw holding position, releasing the holding at the screw insertion position, or the like is prevented is prevented.

[0032]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a suction-holding type screw tightening device according to the present invention, and FIG. 2 is a side view of an automatic assembly device. This suction-holding type screw tightening device 1 is adopted in a process of assembling a board 9 having electronic components mounted on a main body case 7 in automatic assembly of electric equipment, and is attached to an automatic assembly device 20. ing. A plurality of pillars 8 are erected on the inner surface of the main body case 7, and screw holes 8a for screwing the tapping screws 6 into the upper parts of the pillars 8 are provided.
Are formed. Further, on the substrate 9 side, each screw hole 8a
An insertion hole 9a having a diameter slightly larger than that of the screw hole 8a is formed at a position opposed to.

The automatic assembling apparatus 20 has a mounting portion 22, an XY table 23, a screw feeder 24, and the like arranged on an upper portion of a base 21. Further, on the side of the base 21, an operation panel including an on / off switch for driving operation, a display lamp and the like is provided. Furthermore, at the bottom of the base 21,
A main controller 25 that controls the operation of the entire device including the XY robot controller that controls the driving of the XY table 23 and the suction-holding type screw tightening device 1 is arranged.

A fixing jig 22a is arranged on the mounting portion 22 so as to surround the outer peripheral portion of the main body case 7, and the main body case 7 in which the substrate 9 is preliminarily accommodated is temporarily fixed to the fixing jig 22a. It is designed to hold. XY table 2
3 comprises a horizontal moving table 23a which moves along the guide rails on the base 21, and a movable plate 23b which moves along one side of the horizontal moving table 23a. Control from the XY robot controller 3 According to the signal, the screw fastener body 2 is moved to the screw tightening position.

The screw feeder 24 comprises an accommodation case 24a for accommodating a large number of tapping screws 6 and an air supply pump 24b. The air supply pump 24b is provided with the accommodation case 24a and the screw tightening tool main body 2 via the pipe 16. Connected to. In this screw feeder 24, the air supply pump 24b is turned on based on the control signal from the main controller 25, and the tapping screw 6 is sucked from the housing case 24a,
The screws 6 are fed one by one to the screw fastener main body 2 side in accordance with the timing of sequentially tightening the plurality of screws 6.

The suction-holding type screw tightening device 1 of the present example has an air control device 31 attached to the conventional screw tightening device 10 and has the same basic structure as the conventional example shown in FIG. The detailed description of is omitted. In this suction-holding type screw tightening device 1, the screw tightening tool main body 2 has an XY table 23.
It is configured to move horizontally by the cylinder 26 and move up and down by the cylinder 26. The cylinder 26 is fixed to the upper part of the movable plate 23b, and the tip of a rod that moves back and forth in the vertical direction is fixed to the arm 27. This arm 2
Reference numeral 7 denotes an inverted L shape, the base end side of which is slidably engaged with a guide rail attached to the side surface of the movable plate 23b, and the tip end for holding the screw tightening body 2 extends in the horizontal direction. .

The cylinder 26 moves the screw fastener main body 2 forward and backward from the holding position of the tapping screw 6 to the screw tightening position. In addition to receiving the screw 6 and inserting the screw 6, air supply, suction, etc. Is performed based on the signals from the sensors 28 to 30. This sensor 2
8 to 30 are composed of an upper limit, a center, and a lower limit, and are arranged near the driver 4 along the length direction of the cylinder 26. In addition, the lengths of the sensors 28 to 30 themselves and the distance between them are set in accordance with the continuous screw tightening operation. Further, a detection unit is attached to the upper end of the driver 4, and each sensor 28 to 30 detects the position of the detection unit as the driver 4 moves up and down and outputs a detection signal to the main control unit 25. It is composed.

The air control device 31 has an air compressor (not shown) and a solenoid valve 32 as main parts.
And the high pressure air from the compressor is connected to the connecting pipe 36.
Is sent to the solenoid valve 32 via the. The solenoid valve 32 is a switching valve that switches between air supply and intake, and a first air supply pipe 37 and a second air supply pipe 38 are connected to each other. The first air supply pipe 37 is connected to the connection port 14 of the screw fastener main body 2 via a connecting pipe 40 and communicates with the air flow passage 3. The second air supply pipe 38 is connected to one end of the ejector 33, and the other end of the ejector 33 is connected to the silencer 35 for silencing. Further, the ejector 33 is connected to an air filter 34 via an intake pipe 39.
Is connected to the connecting pipe 40.

When the solenoid valve 32 is switched to the intake side, high pressure air from the compressor is sent to the ejector 33. The ejector 33 discharges high-pressure air to the silencer 35 side, so that the inner chamber becomes a negative pressure and sucks air on the intake pipe 39 side. Then, the air on the side of the screw holding portion 5 is sucked in, the tapping screw 6 is received, and then the tapping screw 6 held by the screw holding portion 5 is received.
Is sucked into the lower opening 13c of the movable cylinder 13 and adsorbed to the tip portion 18a of the shaft 18. In addition, this suction force is generated by the ejector 33 so that the grip claw 19 is moved by the tapping screw 6
It is set so that it does not fall even if the holding of is released.

When the solenoid valve 32 is switched to the air supply side, the high pressure air from the compressor is sent to the screw holding portion 5 side via the first air supply pipe 37 and the connecting pipe 40. Then, this high-pressure air is blown out toward the substrate 9 side from the lower opening 13c of the movable cylinder 13 via the air flow passage 3.

The main control section 25 reads data from the memory based on the operation signal sent from the operation section, and X
-Y Send a control signal to the robot controller to send the X
The Y table 23 is driven to sequentially move to the screw tightening position, and the cylinder 26 is operated to move the driver 4 back and forth between the upper side 11a and the lower side 11b. In addition, a command signal is sent to the screw feeder 24 based on the detection signals from the sensors 28 to 30 to feed the tapping screw 6, and the solenoid valve 32 is also provided.
A switching signal is sent to control the air supply or the intake side.

Next, the operation of the assembling apparatus provided with the suction-holding type screw tightening device will be described with reference to the timing chart shown in FIG. First, when the operator activates the automatic assembly apparatus 20, the main body case 7 accommodating the substrate 9 is carried into the mounting portion 22 on the base 21, and the fixing jig 22
held in a. The substrate 9 is accommodated in the main body case 7 in advance so that the screw hole 8a and the screw insertion hole 9a are aligned with each other.

Next, the XY table 23 is driven and moved onto the main body case 7, and the positioning is performed at the first screw tightening location. At this time, the suction-holding type screw tightening device 1 is stopped at the upper side 11a, the screw feeder 24 is operated based on the detection signal from the upper limit sensor 28, and one tapping screw 6 holds the suction-holding type screw tightening. It is delivered to the device 1. Further, the compressor of the air control device 31 operates, and the solenoid valve 32, which is switched to the intake side in advance, sucks the air on the side of the lower opening 13c.

At this time, since the movable barrel 13 of the screw holding portion 5 and the shaft 18 of the driver 4 are housed in the lower side 11b and the driver 4 is at the upper limit position, the grip claw 19 is in a converged state. . Therefore, when the tapping screw 6 is delivered, the head 6a of the tapping screw 6 is gripped by the grip claws 19 and the tip of the screw portion 6b is held in a protruding state. At this time, since the suction of air continues, the head portion 6a is engaged with the tip portion 18a of the shaft 18 (see FIG. 1).
State indicated by virtual line A).

Then, when the cylinder 26 is driven and the driver 4 starts descending (a in the figure), the main body 17 rotates the shaft 18 and the tapping screw 6. When the driver 4 further descends in this state and reaches the lower limit sensor 30 (b in the figure), the solenoid valve 32 is switched to the air supply side based on the detection signal from the lower limit sensor 30.
As a result, air is delivered to the screw holding portion 5 side and blown out from the screw holding portion 5 side toward the substrate 9 side (FIG. 11C). Therefore, dust near the upper surface of the substrate 9 and chips of the drill remaining in the screw insertion holes 9a of the substrate 9 are blown off.

Further, when the tip of the movable barrel 13 comes closest to the substrate 9 at a position where the driver 4 descends and the screw portion 6b of the tapping screw 6 faces the screw insertion hole 9a of the substrate 9, the movable barrel 13 and the shaft And 18 project from the lower side 11b. Along with this, when the tip of the movable cylinder 13 pushes and expands the grip claw 19, the holding of the tapping screw 6 is released and the tapping screw 6 is inserted into the screw insertion hole 9a.

When the tip of the movable cylinder 13 comes into contact with the substrate 9, the spring 2a accommodated in the inner cylinder 12 contracts to absorb the shock. Further, the tapping screw 6 is screwed into the screw hole 8 a of the column 8 by the shaft 18 of the rotating driver 4. At this time, if the screw hole 8a and the screw insertion hole 9a are misaligned and the tapping screw 6 is inserted in an inclined state, the opening portion of the screw insertion hole 9a may be scraped. However, the shavings are
Since it is blown away by the air from the side, it is discharged without remaining in the screw insertion hole 9a. Therefore, before and after screw tightening, dust and shavings are not sucked into the screw tightener body 2 side.

In this way, when the tapping screw 6 is screwed in and the torque applied to the shaft 18 becomes strong, the screw tightening is stopped based on the signal emitted from the torque sensor, and the driver 4 starts to move upward ( The same figure c, d).
Then, when the driver 4 passes the central sensor 29, the solenoid valve 32 is switched to the intake side based on the detection signal output from the central sensor 29 (e in the figure), and the lower opening 13c and the screw holding portion 5 side. Air is sucked.

After that, when the driver 4 moves to the uppermost position and reaches the upper limit sensor 30, the next tapping screw 6 is sent from the screw feeder 24 to the screw fastening body 2 based on the detection signal from the upper limit sensor 30. Be paid. At this time as well, since the grip claws 19 are in the converged state, when the tapping screw 6 is received, the tip of the screw portion 6b is held in a state of slightly protruding.

Subsequently, the XY table 23 is driven to move from the first screw tightening position to the second screw tightening position, and when the positioning is performed, the driver 4 starts descending and the screws are screwed as described above. It will be tightened. When all the screws are tightened, the main body case 7 to which the substrate 9 is fixed is unloaded, the next main body case 7 is loaded, and the assembling work of the substrate 9 is continued.

In the above embodiment, the case where the plate-shaped member is the board 9 of the electric device has been described, but the board 9 is not limited to being fixed to the main body case 7, and various kinds of holes having insertion holes are formed. It can be widely applied to the case where the plate material of (1) is screwed to the attachment target material. Further, although the tapping screw 6 is used for tightening the screw of the substrate 9, the chips and the like are not sucked even when using screws which are likely to generate chips when screwed into the screw holes 8a. The problem of operation failure is prevented.

[0052]

As described above, according to the present invention, dust adhering to the surface of the plate-like member and shavings generated in the insertion hole and the screw hole when the screw is screwed in are sucked into the air flow passage and clogged in various places. In particular, the problem of malfunctions occurring in the moving parts of the screw holding means is avoided. Therefore, the timing of holding the screw at the screw holding position is deviated and the next screw cannot be held, so that continuous screw tightening becomes impossible and the problem that work efficiency is reduced can be avoided. Further, there is an advantage that maintenance such as disassembly and cleaning, which had to be performed regularly because dust and shavings clogging the screw holding means and other movable parts, becomes unnecessary.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a suction-holding type screw tightening device according to an embodiment of the present invention.

FIG. 2 is a side view of the automatic assembly apparatus.

FIG. 3 is a timing chart for explaining the operation.

FIG. 4 is a schematic configuration diagram of a conventional suction-holding type screw tightening device.

FIG. 5 is a cross-sectional view showing the main parts of the screw fastener main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adsorption holding type screw tightening device 3 Air flow passage 4 Driver 5 Screw holding means 6 Screw 7 Attachment object 8a Screw hole 9 Plate member 9a Insertion hole 13c Opening 18a Tip part 26 Moving means 31 Air control means

Claims (1)

[Claims] 1. A driver for screwing a screw into a screw hole provided in an object to be mounted through an insertion hole formed in a plate-like member, and a screw which is arranged on a tip end side of the driver and is detachable. It is connected to a screw holding means for holding and an air flow passage having an opening directed to the plate-like member side in the vicinity of the tip end portion of the driver, sucking air on the opening side to move the head of the screw to the driver's head. Air control means for adsorbing and holding the tip end portion and sending air to the opening side by switching; moving means for moving the driver and the screw holding means from the holding position of the screw to the insertion position into the insertion hole; The screw holding means holds the head of the screw, and the air control means is switched to the intake side to suck and hold the screw at the tip of the driver, and the moving means is driven to drive the screw. The air control means is switched to the air supply side when the screw is exposed to the insertion hole, the screw holding of the screw holding means is released, and the screw is screwed from the insertion hole to the screw hole by the driver. Suction-holding type screw tightening device having a control means for controlling to screw in.