JPH10193228A - Driver bit and automatic screw tightening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provider a drive bit surely suction holding a screw in a proper attitude and an automatic screw tightening machine. SOLUTION: This driver bit 8, having an engaging part 15 engageable with a drive hole of a screw and a receiving surface 14 coincided with a screw head part upper surface following the engagement of this engaging part 15 with the screw drive hole, is constituted by providing an air suction hole 16 opened in this receiving surface 14 to be capable of sucking air. This automatic screw tightening machine, provided with a driver base capable of reciprocation moving by receiving a drive of a cylinder, is constituted by arranging the driver bit 8 so as to be integrally moved rotatably by receiving a drive of a rotary drive source in this driver base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver bit capable of suction-holding a screw by air suction and to an automatic screw tightening machine.

[0002]

2. Description of the Related Art Conventionally, when a screw is screwed into a work,
Automatic screw tightening machines are used. This type of automatic screw tightening machine mainly includes a driver table that can reciprocate by operating a reciprocating drive source, a driver bit that is disposed on the driver table and that can be rotated by being driven by a rotary drive source, and It is composed of a suction sleeve that can be protruded and that can suction air by receiving the operation of the air suction device, and a chuck unit that can hold a screw on the movement path of the driver bit.
The suction sleeve is brought close to the screw held by the chuck unit, and the screw is sucked by air.The screw is supplied to the screw tightening position of the work. It is designed to be tightened.

[0003]

However, in the above-mentioned conventional automatic screw tightening machine, air escape occurs due to a dimensional difference between the inner diameter of the suction sleeve and the head of the screw, and the screw cannot be sucked into the sleeve. Or, there is a problem that the screw is inclined when the screw is sucked into the sleeve, and it is pointed out that the screw cannot be surely sucked and held in a correct posture. Also, when a suction sleeve is used, if the screw tightening position is set at the bottom of a hole having a diameter slightly larger than the diameter of the head of the screw, the suction sleeve cannot be brought close to the screw tightening position. There have been problems such as that the screw pressed by the bit falls off and the screw cannot be tightened.

[0004]

In order to solve the above-mentioned problems, a driver bit according to the present invention comprises an engaging portion engageable with a driving hole of a screw, and the engaging portion engages with a driving hole of the screw. As a result, it has a receiving surface that matches the upper surface of the head of the screw, and is provided with an air suction hole that opens to this receiving surface and that can suck air.

In order to solve the above-mentioned problems, an automatic screw tightening machine according to the present invention is provided with a driver table which can be reciprocated by being driven by a reciprocating drive source. A driver bit having an engaging portion rotatable and capable of engaging with a driving hole of a screw is arranged so as to move integrally, and the driver bit includes an engaging portion capable of engaging with the driving hole of the screw. A receiving surface matching the upper surface of the head of the screw as the engaging portion engages with the drive hole of the screw;
An air suction hole which is open to the receiving surface and is capable of sucking air in response to the operation of the air suction device is provided.

Further, a plurality of air suction holes of the driver bit are formed so as to surround the engaging portion, so that a suction force acts evenly on the screw.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5, reference numeral 1 denotes an automatic screw tightening machine having a column 2 which can be installed at a desired work position. A cylinder 4 is attached to the column 2 via a bracket 3.
A driver base 6 movable along a guide 5 on the front surface of the column 2 is connected to the tip of the rod 4a. A driver bit 8 connected to an output shaft of a rotary drive source 7 such as a motor is arranged on the driver base 6 so as to rotate under the drive of the rotary drive source 7. A chuck unit 9 is provided below the driver bit 8 and connected to the lower end of the guide 5. The chuck unit 9 is configured to be able to hold a screw on the moving path of the driver bit 8 by a pair of chuck claws 10 which are biased so as to be always closed and rotatably provided.

The driver bit 8 comprises a main shaft 11 connected to the output shaft of the rotary drive source 7 and a tip 12 screwed to the tip. The main shaft 11 is provided with a main suction hole 13 along the axis thereof,
Air suction is performed from the main suction hole 13 by operation of an external air suction device (not shown). The distal end portion 12 has a receiving surface 14 that matches the upper surface of the head of the screw to be tightened. The engaging portion 15 is integrally formed.

Further, the tip 12 of the driver bit 8
Is provided with an air suction hole 16 communicating with the main suction hole 13. The air suction hole 16 is provided in the main suction hole 1.
3 and a second communication hole 17 communicating with the vicinity of the bottom of the first communication hole 17 and extending in the diameter direction of the distal end portion 12.
It comprises a communication hole 18 and a suction hole 19 which communicates with the second communication hole 18 and is formed so as to open to the receiving surface 14. The suction hole 19 in the air suction hole 16
Are penetrated around the engaging portion 15, and pass through the first communication hole 17 so that the second communication hole 18 is formed.
Are provided orthogonally in a cross shape.

According to the above configuration, when the screw is held in the chuck unit 9, the cylinder 4 is operated to lower the driver table 6, and the air suction device (not shown) is operated to operate the air suction hole 16. Start air suction from. As a result, the driver bit 8 is lowered and its receiving surface 14 matches the upper surface of the head of the screw held by the chuck claw 10, so that the pressure of the suction air increases and the screw is It is held by suction. After that, since the driver table 6 continues to descend, the screw sucked and held by the driver bit 8 is pushed out from the chuck claw 10 and supplied to the work fastening position, and the rotary drive source 7 is driven to drive the driver bit 8 Is rotated and screwed into the work in response to the rotation.

In the embodiment of the present invention, the number of the suction holes 19 opened in the receiving surface 14 of the driver bit 8 is four, but the number of the suction holes 19 is not deviated from the gist of the present invention. Can be changed arbitrarily. Also, the configuration of the air suction holes 16 can be changed to, for example, a configuration in which the suction holes 19 are each formed obliquely toward the first communication holes 17 to communicate with each other. The effect obtained by changing the configuration is the same.

[0012]

As described above, the driver bit of the present invention has the receiving surface corresponding to the upper surface of the screw head and the air suction hole opened in the receiving surface for sucking air. Therefore, the screw can be sucked and held in a state where the receiving surface matches the upper surface of the head of the screw, and effects such as being able to surely suck and hold the screw in a correct posture can be obtained.

Further, if this driver bit is used in an automatic screw tightening machine, the screw can be surely held in a correct posture without using a suction sleeve which is conventionally required for holding the screw by suction. It is possible to provide an inexpensive automatic screw tightening machine with a simple configuration by omitting the components such as the above, and the screw tightening position is set at the back of a hole having a diameter slightly larger than the head diameter of the screw. Also in this case, there is an advantage that the screw can be sucked until the screw tightening is completed and the screw can be surely tightened.

Further, since a plurality of air suction holes are provided around the engaging portion, the suction force acting on the screw is made uniform,
There are also advantages such as being able to more securely hold the screw by suction.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cutaway sectional view of a main part of a driver bit according to the present invention.

FIG. 2 is a front view of the automatic screw tightening machine according to the present invention.

FIG. 3 is a plan view of a driver bit according to the present invention.

FIG. 4 is a front view of a driver bit according to the present invention.

FIG. 5 is an enlarged perspective view of a main part showing the vicinity of the tip of a driver bit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic screwdriver 4 Cylinder 6 Driver stand 7 Rotation drive source 8 Driver bit 9 Chuck unit 14 Receiving surface 15 Engagement part 16 Air suction hole

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[Procedure amendment]

[Submission date] April 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

In order to solve the above problem, a driver bit according to the present invention is provided on an upper surface of a screw head.
A receiving surface of matching shape is formed at the tip, and from this receiving surface
Integrally molded engaging part that can protrude and engage with screw drive hole
When the engaging portion engages with the drive hole of the screw, the receiving surface
Is formed so as to match the upper surface of the head of the screw, while being provided with an air suction hole which is open to the receiving surface and is capable of sucking air.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

In order to solve the above-mentioned problems, an automatic screw tightening machine according to the present invention is provided with a driver table which can be reciprocated by being driven by a reciprocating drive source. A driver bit having an engaging portion rotatable and capable of engaging with a drive hole of the screw is arranged and moved so as to move integrally, and the driver bit is provided on a top surface of the head of the screw.
Form a receiving surface with a shape that matches
Integrally formed engaging part that can protrude and engage with the screw drive hole
When the engaging portion engages with the drive hole of the screw, the receiving surface
While configured to conform to the head top surface of the screw, configured comprising a inhalable air suction hole to the air receiving operation of the air suction device opens into the <br/> receiving surface Have been.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

According to the above configuration, when the screw is held in the chuck unit 9, the cylinder 4 is operated to lower the driver table 6, and the air suction device (not shown) is operated to operate the air suction hole 16. Start air suction from. Accordingly, the driver bit 8 is lowered and its receiving surface 14 matches the upper surface of the head of the screw held by the chuck claw 10, so that the screw is sucked and held by the driver bit 8 by the suction air. . After that, since the driver table 6 continues to descend, the screw sucked and held by the driver bit 8 is pushed out from the chuck claw 10 and supplied to the work fastening position, and the rotary drive source 7 is driven to drive the driver bit 8 Is rotated and screwed into the work in response to the rotation.

Claims (4)

[Claims] An engaging portion engageable with a driving hole of a screw, a receiving surface matching an upper surface of a head of the screw when the engaging portion is engaged with the driving hole of the screw, and a receiving surface. A driver bit having an air suction hole which is open to the air and is capable of sucking air. 2. A driver base, which is reciprocally movable upon receiving a drive from a reciprocating drive source, and has an engaging portion which is rotatable upon receiving a drive from a rotary drive source and is engageable with a drive hole of a screw. In an automatic screwdriver arranged so that a driver bit provided is integrally moved, the driver bit has an engaging portion engageable with a driving hole of the screw, and the engaging portion engages with the driving hole of the screw. Automatically comprising a receiving surface corresponding to the upper surface of the head of the screw, and an air suction hole opened in the receiving surface and capable of sucking air by operation of an air suction device. Screw tightening machine. 3. The driver bit according to claim 1, wherein a plurality of air suction holes are formed so as to surround the engaging portion. 4. The automatic screw tightening machine according to claim 2, wherein a plurality of air suction holes are formed so as to surround the engaging portion.