JPH0647622Y2 - Screw holding device for screw tightener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a screw holding device that holds a screw by a chuck member provided on a front nose member of a screw tightener body.

(Prior Art and Problems Thereof) Generally, a nose member is arranged at the front of a screw tightening machine body so as to be relatively movable, and an opening for sliding a driver bit provided in the screw tightening machine body is provided on the nose member. Formed, and a pair of chuck members are axially supported in guide grooves formed on the left and right sides of the mouth portion such that the tips open and close, and the shaft portions of the screws supplied into the nose member are attached to the tips of the chuck members. There is known a screw holding device which is held coaxially with the driver bit.

As shown in FIG. 4, the nose member is provided with a pair of chuck members 20 each having a central portion pivotally supported by the nose member and a tip end formed with a holding groove for holding a shaft portion of a screw. The other end of the chuck member 20 and the nose member 21
It is configured to hold the screw shaft portion at the tip end portion by a spring disposed between and. Usually, chuck member 20
Is swingably arranged in a guide groove 22 formed in the nose member 21, and is guided by a wall portion of the guide groove 22.

However, since a gap is created between the chuck member 20 and the guide groove 22 due to manufacturing accuracy error, wear, etc., the chuck member 20 rattles in the guide groove 22, and both chuck members 20 move in opposite directions. As a result, the groove 23 for holding the screw at the tip of the chuck member is brought into a non-aligned state, and the phenomenon that the shaft portion of the screw supplied to the nose member 21 cannot be held well occurs.

(Object of the Invention) The present invention solves the above-mentioned drawbacks, and in particular, by moving the tip of each chuck member in a certain direction within the guide groove of the nose member, play of the chuck member occurs in the guide groove. Even so, it is an object of the present invention to provide a screw holding device for a screw tightening machine, which can maintain a screw holding groove at the tip of a chuck member in an aligned state and eliminate a screw holding defect.

(Means for Achieving the Purpose) In order to achieve the above-mentioned object, a screw holding device of a screw tightening machine according to the present invention has a nose member arranged at a front portion of a screw tightening machine body so as to be relatively movable. And a guide groove formed on both the left and right sides of the mouth part, which has a mouth part for sliding a driver bit provided in the body of the screw tightener and a supply port for supplying a screw into the mouth part. A screw holding device for axially supporting a pair of chuck members in such a manner that their tips are opened and closed, and for holding a shaft portion of a screw supplied into the nose member at the tips of the chuck members coaxially with the driver bit, A direction in which the tip end of each chuck member is closed between the inner surface of each chuck member and the outer surface of the nose member while axially supporting the chuck members housed in the guide grooves so as to swing in the same plane. To A spring for pressing the chuck member in a direction orthogonal to the plane at the same time as pressing is interposed.

The spring may be a compression spring, and the opposing spring bearing surfaces of the chuck member and the nose member may be inclined.

Further, the spring bearing seat surface position may be formed higher on the chuck member side and lower on the nose member side.

(Operation and Effect of the Invention) According to the above configuration, the spring presses the tip end portion of each chuck member in the closing direction and simultaneously presses the other end of the chuck member in the direction orthogonal to the plane. The tips of the chuck members are aligned and aligned in the same direction within the guide grooves, and the screw holding grooves formed by these chuck members are also aligned. As a result, even if there is a gap between the guide groove and the chuck member that causes rattling due to dimensional error in manufacturing or wear of the member due to use, the screw holding groove is supplied from the supply port. The shaft of the screw jumped into is always held in good condition. The same is true even if backlash occurs as a result of wear of the member due to use.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 indicates a nose member. The nose member 1 is arranged in a front part of a screw tightener main body (not shown) so as to be relatively movable, and has a mouth 4 and a screw 7 for sliding a driver bit 3 provided on the screw tightener main body. A supply port 5 for supplying into the mouth portion 4 is formed. A screw supply device (not shown) is connected to the supply port 5 in series. Further, guide grooves 8 are formed in the front-rear direction on both left and right sides of the mouth portion 4 of the nose member 1. The front end side (the tip end side of the nose member 1) of the guide groove 8 is open to the mouth portion 4 to which the screw 7 is supplied, but the partition wall 6 which is defined with the mouth portion 4 is formed on the opposite side. .

By the way, the screw holding device for the nose member 1 is configured as follows. That is, a pair of chuck members 9 are housed in the guide groove 8. The central portion of each chuck member 9 has a support shaft 10 provided above and below the guide groove 8.
Is rotatably supported by the same plane,
A holding groove 11 for the screw 7 is formed at the tip of the chuck member 9. A compression spring 12 is arranged between the inner surface of the rear end of the chuck member 9 and the outer surface of the partition wall 6. The compression spring 12 causes the pair of chuck members 9 to constantly hold the holding groove 11.
The shaft portion of the screw 7 supplied into the nose member 1 is held coaxially with the driver bit 3 in the holding groove 11 because the tip end of the screw 7 is biased to close.

Further, the seat surface 13a of the spring formed on the inner surface of the chuck member 9 and the seat surface 13b formed on the outer surface of the partition wall 6 are formed so as to be parallel to each other. 13a and 13b are formed so as to be inclined in a V shape. According to the screw holding device having the above structure, the compression spring 12 presses the tip end of each chuck member 9 in the closing direction, and at the same time, moves the rear end of the chuck member 9 in the direction orthogonal to the plane (upward in the figure). Since it is pressed, the tip of the chuck member 9 is urged downward in the drawing. Therefore, the tips of the chuck members 9 on both sides are aligned in the same direction in the guide groove 8, and the screw holding grooves 11 formed by these chuck members 9 are also aligned. As a result, even if there is a gap between the guide groove 8 and the chuck member 9 that causes rattling due to dimensional error in manufacturing or wear of the member due to use, the screw is supplied from the supply port 5 and screwed. The shaft portion of the screw 7 that has jumped into the holding groove 11 is always held in good condition. During the screw tightening work, the tip of the driver bit 3 and the head groove of the screw 7 are smoothly fitted.

Even if the bearing surface position for receiving the compression spring is formed to be high on the chuck member 9 side and low on the nose member 1 side, at the same time as pressing the tip end portion of each chuck member 9 in the closing direction,
The rear end of the chuck member 9 can be pressed in a direction orthogonal to the plane.

[Brief description of drawings]

1 is a side view of a screw holding device of a screw tightener according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view taken along line XX of FIG. 1, and FIG. 4 is a conventional screw. It is a front view of a holding device. Reference numeral 1 ... Nose member, 3 ... Driver bit, 4 ...
Mouth part, 5 ... Supply port, 7 ... Screw, 8 ... Guide groove, 9
...... Chuck member, 12 ...... Compression spring

Claims (3)

[Scope of utility model registration request] 1. A nose member is movably arranged in a front part of a screw tightening machine main body, and a mouth and a screw for sliding a driver bit provided on the screw tightening machine main body to the nose member. And a pair of chuck members are pivotally supported in guide grooves formed on both left and right sides of the mouth so that the tips open and close, and a nose is attached to the tips of the chuck members. In a screw holding device for holding a shaft portion of a screw supplied in a member coaxially with the driver bit, while supporting a chuck member housed in the guide groove so as to swing in the same plane, Between the inner surface of each chuck member and the outer surface of the nose member, a spring for pressing the chuck member in the direction orthogonal to the plane at the same time as pressing the tip end of each chuck member in the closing direction is interposed. A screw holding device for a screw tightening machine. 2. The screw holding device for a screw tightener according to claim 1, wherein the spring is a compression spring, and the opposing spring bearing surfaces of the chuck member and the nose member are formed to be inclined. 3. The screw holding device for a screw tightener according to claim 1, wherein the spring bearing seat surface is formed so that the chuck member side is high and the nose member side is low.