JP3214334B2 - Shutter device of screw tightening machine for connecting screw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for a screw tightening machine for a connecting screw, and more particularly, to a shutter for opening and closing a screw introduction port of a screw chuck so as to be retractable from a screw path to remove a connecting screw. The present invention relates to a shutter device of a screw tightening machine for connecting screws, which facilitates the above.

[0002]

2. Description of the Related Art In general, a power screw tightening machine using a connecting screw in which a number of screws are connected in parallel by a plastic belt or the like cannot visually check a screw supplied into a nose portion. When tightening a screw that has a screw, it is difficult to match the screw to the screw insertion hole unless the tip of the screw is exposed.Therefore, a screw tightening machine configured so that the screw protrudes from the tip of the nose block is used. Proposed.

[0003] In this screw tightening machine, one side of a screw chuck at the end of a nose block of the screw tightening machine is opened to provide a screw introduction port, and the body of a connection-type screw is inserted into the screw chuck so that the tip of the screw is tightened. This is a structure in which the portion protrudes from the screw chuck. However, if the screw inlet is always open, the tip of the screw may come into contact with a building material or the like and fall out of the screw inlet to prevent the screw from being screwed. In order to prevent the screw from being inclined, a screw guide device that opens and closes a screw inlet of a screw chuck has been proposed (Japanese Patent Application No. 7-120).
No. 580).

FIG. 5 shows a nose portion of a screw tightening machine provided with the above-described guide device, 1 is a nose holder fixed to the screw tightening machine main body, 2 is a nose block slidably inserted into the nose holder and 3 is free. Denotes a pair of left and right screw chucks, and 4 denotes a driver bit.

[0005] A compression coil spring 5 is interposed between the nose block 2 and the main body housing, and the nose block 2 is urged in a direction to extend from the nose holder 1. A shutter lever 6 for opening and closing the screw inlet 3a on the lower surface of the screw chuck 3 is pivotally mounted on the front surface of the nose block 2. The front end of a lever 7 pivotally mounted inside the nose block 2 projects from the front surface of the nose block 2. And is engaged with the lower end of the shutter lever 6.

On the inner wall surface of the nose holder 1, there are two levels of cam surfaces 1a, 1a parallel to the sliding direction of the nose holder 2.
The guide roller 9 at the rear end of the lever 7 is pressed against the cam surface 1a by the urging of the compression coil spring 8.

The shutter lever 6 is urged by a spring (not shown) in a direction to retreat from the lower surface of the screw chuck 3 (counterclockwise in FIG. 2B), but in an initial state shown in FIG. 7, the screw chuck 3 is turned to a position where the screw inlet 3a on the lower surface of the screw chuck 3 is closed.

When the nose block 2 is slid in the contracting direction from the state shown in FIG. 1, the guide roller 9 of the lever 7 rolls along the lower cam surface 1a, and when it rides on the higher cam surface 1b, the lever 7 Is rotated outward from the position shown in FIG. In conjunction with this, the shutter lever 6 rotates counterclockwise in FIG. 4B, and the screw inlet 3a of the screw chuck 3 is opened.

When the screwing machine is separated from the wall surface after screwing, the nose block 2 extends, and although not shown,
The ratchet wheel with a ratchet for screw feeding provided in the nose block 2 rotates by a fixed angle via a link, and the connecting band B of the connecting screw BS engaged with the ratchet wheel is shown in FIG. The next screw S is fed into the screw chuck 3 by feeding a certain distance from the bottom to the top, and at the same time, the lever 7 and the shutter lever 6 rotate in the direction opposite to the contraction stroke, and the shutter lever 6 Return to the closed position shown.

[0010]

A connecting screw screw tightening machine provided with a shutter consumes a screw halfway through a connecting band to complete the work, or to replace the connecting screw with a different type of connecting screw. When removing from the screw tightening machine, the connecting screw cannot be removed unless the shutter is opened and the screw introduction port is opened.

However, in the conventional shutter device of the screw tightening machine for connecting screws, it is necessary to push the nose block into the nose holder in order to open the shutter, so that the nose block contracts with one hand against the repulsive force of the compression spring. While holding in the state, you will pull out the connecting screw with the other hand,
There is a disadvantage that operability is poor.

Therefore, there arises a technical problem to be solved in order to facilitate the operation of removing the connecting screw.
An object of the present invention is to solve the above problems.

[0013]

SUMMARY OF THE INVENTION The present invention proposes to achieve the above-mentioned object, and is a screw tightening machine for connecting screws using connecting screws which are inserted at regular intervals in the longitudinal direction of the connecting band. A nose block is slidably inserted into a nose holder of a screw tightening machine body in a screw screwing direction in a predetermined range, and the nose block is urged in a direction of extension by a spring, and the nose block and the nose block A screw introduction port is opened on one surface of the screw chuck attached to the tip of the screw chuck, a shutter lever for opening and closing the screw introduction port of the screw chuck is attached to the nose block, and a cam mechanism is interposed between the shutter lever and the nose holder. Then, when the nose block contracts and extends, the shutter lever opens and closes the screw inlet of the screw chuck. In the shutter device of the use screwing, the shutter lever (15) to the side of the nose block (12), tiltably to the nose block (12)
A cam mechanism (18), which is mounted to be rotatable up and down and swingable right and left as viewed from the front via a support shaft (16) attached thereto, and drives the shutter lever (15) up and down. The screw inlet (13) on the lower surface of the screw chuck (13) is inserted at the tip of the shutter lever.
a) is opened and closed, and the shutter lever (15) is
When in the open / close position of the screw inlet, the shutter lever
Press the front part of (15) to the side in front view to
The lever (15) to the side via the support shaft (16).
By pivoting the shutter lever (15) , the distal end portion of the shutter lever (15) is formed to be retractable to the side of the screw introduction port, and the nose block (12) is provided with a shutter lever.
It is an object of the present invention to provide a shutter device of a screw tightening machine for a connecting screw, comprising a locking portion (12d) for locking (15) at a retracted position.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a nose portion of a screwdriver for connecting screws, and a nose holder 11 is fixed to a mechanism housing with a grip of the screwdriver for connecting screws. Nose block 12 is loosely fitted slidably in Nozuhoruda 11, the distal end portion of the nose block 12 positive
In a plan view, a screw chuck 13 divided into two right and left parts is pivotally mounted. The driver bit 14 disposed in the nose holder 11 is connected to a rotation drive mechanism by an electric motor of a mechanism housing (not shown). A compression coil spring (not shown) is interposed between the mechanism housing and the nose block 12, and the nose block 12 is urged in a direction to extend from the nose holder 11.

Nose block 12 and screw chuck 1
3, screw introduction ports 12a and 13a are opened on the lower surface, and the screw guide path 12b of the nose block 12 crosses the path of the driver bit 14 in the vertical direction. Screw chuck 13
Is urged in the closing direction by a spring (not shown), but is expanded right and left as viewed from the front by the head of a screw S that advances in the screw chuck 13 when tightening the screw.

Screw inlet 13 on the lower surface of screw chuck 13
The shutter shaft 15 is opened and closed. A support shaft 16 is inserted into a bearing 15a formed at the front and rear intermediate portion, and the support shaft 16 is tiltably engaged with the nose block 12 so that the shutter lever 15 can be turned up and down. And it is attached so as to be able to swing right and left when viewed from the front .

The shutter lever 15 is connected to the screw inlet 1 of the screw chuck 13 by a torsion coil spring (not shown).
3a is urged in the direction of opening the (clockwise in FIG. 1), the rear end side of the guide roller 17 of the shutter lever 15, engages with the cam groove 18 formed on the side surface of Nozuhoruda 11 1, the front end portion closes the screw inlet 13a on the lower surface of the screw chuck 13 in the standby state shown in FIG.

As shown in the figure, the cam groove 18 is a parallelogram loop, and the guide roller 17 circulates in the cam groove 18 along a clockwise path in the figure. A one-way shutter lever 19 is pivotally mounted on the front of the nose holder 11, the front oblique side 18 d of the cam groove 18 is closed by the tip of the one-way shutter lever 19, and the guide roller 17 is initialized when the nose block 12 contracts. It is guided from the position to the bottom 18a of the cam groove.

Reference numeral 20 denotes a ratchet with ratchet of the screw feeder. The screw feeder has a known configuration, and although not shown, has a feed claw that engages with a connection band of a connection screw on an outer peripheral surface, and a ratchet wheel in which ratchet claws are radially arranged at a constant angle on a side surface, A ratchet pawl of the ratchet and a disc having holes radiated symmetrically are loosely fitted coaxially, and the disc is pressed against the side surface of the ratchet by the bias of a spring.

The disk of the ratchet wheel 20 with a ratchet and the nose holder 11 are connected by a link (not shown), and the disk rotates reciprocally by a fixed angle in conjunction with the extension and contraction of the nose block 12 with respect to the nose holder 11, but the ratchet wheel is reversed. A ratchet mechanism is formed that does not rotate during contraction but rotates only one direction during extension by a fixed angle due to the action of a stop claw (not shown). The connection screw BS is sequentially supplied to the screw chuck 13 by a ratchet.

The engagement between the ratchet and the check pawl can be released by pressing the shaft 21 of the ratchet & ratchet 20. By this pressing operation, the ratchet & ratchet 20 can be released.
Can idle.

FIG. 2 shows the opened state of the shutter lever 15. When the nose block 12 is slid in the contracting direction, the guide roller 17 of the shutter lever 15 moves rearward along the bottom 18a of the cam groove, and at the intermediate portion. Rear hypotenuse 1
It rises along 8b and advances to the rear end portion of the upper side 18c. When it is extended, it moves forward along the upper side 18c, descends along the front oblique side 18d, presses the back of the one-way shutter lever 19, and
Is retracted from the route and returns to the initial position shown in FIG. The shutter lever 15 reciprocates and rotates following the expansion and contraction of the nose block 12, and opens and closes the screw introduction port 13 a of the screw chuck 13.

As shown in FIG. 3, the lower half of the side surface on the shutter lever side of the nose block 12 is formed to be narrow.
An inclined guide surface 12c that guides the shutter lever 15 to a position where the screw introduction port of the screw chuck 13 is closed and a position where the screw introduction ports 13a and 12a that are obliquely downward are opened is formed. The shutter lever 15 rotates up and down while being in contact with the guide surface 12c by the bias of the torsion coil spring,
The body of the screw is scooped from obliquely below the screw inlets 13a and 12a and inserted into the screw chuck 13.

As shown in FIGS. 1 and 3, the upper portion of the guide surface 12c protrudes laterally beyond the guide surface 12c, and the outer corner is a step portion for holding the shutter lever 15 at the retracted position. A certain locking portion 12d is formed.

[0025] When removing the connecting screws BS in use from screwing is pressed by the shutter lever front of the shutter lever 15 in the threaded inlet closed position shown in FIG. 3 to the outside at the front view with a finger The front end of the shutter lever 15 is moved to the nose block 1 as shown in FIG.
2, the shutter lever 15
Is locked in the retracted position.

Then, the shaft 21 of the ratchet wheel 20 with a ratchet is pressed to release the engagement between the ratchet wheel and the check pawl, the ratchet wheel 20 with the ratchet is idled, and the connecting screw BS is pulled downward. The connecting screw BS can be easily removed from the tightening machine.

The present invention is not limited to the above-described embodiment, and various modifications can be made to the shutter lever and the shape of the step engaging with the shutter lever and the like. It goes without saying that it covers everything.

[0028]

As described above, the shutter device of the screw tightening machine for a connecting screw according to the present invention is provided with the side surface of the nose block.
The nose block so that it can tilt freely.
It can be turned up and down freely through the support shaft
The camera is mounted so that it can swing left and right
The shutter is provided with a cam mechanism that drives the bar up and down.
At the tip of the lever, screw the bottom of the screw chuck
Open and close the entrance, and the shutter lever introduces the screw
When the mouth is in the open / close position, the front part of the shutter lever is
Push the shutter lever to the side in
By swinging the shutter laterally through the shaft,
The tip of the lever can be retracted to the side of the screw inlet.
And a shutter lever on the nose block.
Since the locking portion for locking is provided at the retracted position, the shutter lever can be locked in a position retracted from the screw inlet, depending, unlike conventional shutter device, screw driver body nose block Operability when removing the connecting screw is remarkably improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a partially cutaway side view of a nose portion of a screw tightening machine for a connecting screw.

FIG. 2 is a partially cutaway side view of a nose portion showing a rotating state of a shutter lever shown in FIG. 1;

FIG. 3 is a front view of the nose block shown in FIG. 1;

FIG. 4 is a front view of the nose block showing a state in which a shutter lever is locked at a retracted position.

5A and 5B show a conventional example, in which FIG. 5A is a plan sectional view of a nose portion of a connecting screw screwing machine, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Nose holder 12 Nose block 12a Screw introduction port 12b Screw guide path 12c Guide surface 12d Locking part 13 Screw chuck 13a Screw introduction port 14 Driver bit 15 Shutter lever 15a Bearing 16 Support shaft 17 Guide roller 18 Cam groove 19 One-way shutter lever 20 Ratchet Claw wheel 21 axes

Claims (1)

(57) [Claims] 1. A shutter device for a screw driver for a connecting screw using connecting screws inserted at regular intervals in a longitudinal direction of a connecting band, wherein a nose block is screwed in a nose holder of a screw driver body. The nose block is slidably inserted into the nose block, and the nose block is urged in the direction of extension by a spring, and a nose block and a screw introduction port are opened on one surface of a screw chuck attached to the tip of the nose block. A shutter mechanism for opening and closing a screw introduction port of the screw chuck is provided. A cam mechanism is interposed between the shutter lever and the nose holder so that the shutter lever introduces the screw of the screw chuck when the nose block contracts and extends. In a shutter device of a screw tightener for a connecting screw that opens and closes a mouth, a side surface of the nose block (12) The shutter lever (15), tiltably engaged to the nose block (12)
Can be turned up and down freely through the attached support shaft (16) ,
Further , a cam mechanism (1 ) which is mounted to be swingable right and left in a front view and drives the shutter lever (15) up and down.
8), the screw inlet (13a) on the lower surface of the screw chuck (13) is opened and closed at the tip end of the shutter lever , and the shutter lever (15) is connected to the screw guide.
When the shutter is in the open / close position of the entrance, the shutter lever (15)
Press the front part of the shutter lever
-(15) is swung laterally through the support shaft (16).
With this, the distal end portion of the shutter lever (15) is formed so as to be retractable to the side of the screw introduction port,
The nose block (12) has a shutter lever (15)
A locking portion (12d) for locking the lock screw at the retracted position.