JP2000354981A - Blank driving prevention device for fastening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent blank driving of a nailing machine by constituting it to press a trigger valve stem through a lever installed on a trigger stem and devising it impossible to press the trigger valve stem as the lever is removed from a position immediately below the trigger valve stem when a fastener is used up. SOLUTION: A slot 11a is molded on an intermediate part of a trigger lever 11, and a lever 13 is pivotally installed on a bracket 11b projected downward. A tension coil spring 14 is connected to the lever 13, and a lower end part of the lever 13 is press-fitted on a connecting nail N of a nail magazine or a pusher. An upper end of the lever 13 is positioned roughly immediately below a trigger valve stem 15, and when the trigger lever 11 is pulled, the upper end of the lever 13 presses the trigger valve stem 15 and nailing is carried out. When the pusher 9 advances in accordance with consumption of nails and the lower end of the lever 13 is removed from the pusher 9, the upper end of the lever 13 is displaced from the position immediately below the trigger valve stem 15, and it comes to be in state where operation of the trigger valve stem 15 by the trigger lever 11 cannot be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening machine such as a nail driving machine or a staple driving machine, and more particularly, to an apparatus for preventing a blank driving when a nail or a staple is used up. Things.

[0002]

2. Description of the Related Art When a trigger lever of a fastening machine such as a nailing machine or a staple driving machine is pulled, a piston in a cylinder and a driver connected to the piston descend at a high speed, and the driver operates a fastener such as a nail or a staple. The fastener is driven into the wood by hitting the upper surface. At this time,
The piston and the driver descending in the cylinder decelerate due to the reaction force when the fastener is hit, and finally the piston hits a rubber bumper inserted into the inner bottom of the cylinder and stops.

However, when the fastener in the magazine of the fastening machine is used up or when the fastener is started without loading the fastener in the magazine, the piston collides with the bumper at a high speed, and an excessive impact is applied to the bumper. In addition to shortening the life of the bumper, there are inconveniences such as a driver's dent left on a surface such as a wall or a floor due to blanking.

[0004] As a means for preventing a blanking of a fastening machine, there is known an "apparatus for preventing blanking of a nail in a nailing machine" described in JP-A-8-47871. In this idle hit prevention device, a rod-shaped stopper member is connected to a trigger lever, a notch is formed at a tip of the stopper, and the tip is inserted into a nail magazine.
When the pusher pushing the connecting nail from the rear is advanced to a certain position, the nail formed on the pusher engages with the notch of the stopper member. With this, when the remaining amount of nails in the nail magazine is reduced or lost, the pusher engages with the stopper member and locks the trigger lever in a non-rotatable state to prevent idle hit. I have.

[0005]

In the above-described conventional idle hit prevention device, when the pusher is engaged with the notch of the stopper member and the trigger lever is locked and the trigger lever is strongly pulled, the pusher or the stopper member is not moved. May be deformed or damaged to be disengaged, or the pusher or the stopper member may be disengaged by slipping even if it is not damaged, and the trigger lever may be turned to the ON position and hit idly.

Therefore, there arises a technical problem to be solved in order to provide an idle hit prevention device capable of reliably preventing an idle hit without causing the possibility of breakage, and the present invention solves the above-mentioned problems. Aim.

[0007]

SUMMARY OF THE INVENTION The present invention proposes to achieve the above-mentioned object, in which a driver is connected to a piston in a cylinder built in a casing, and a nose, which is a driver guide connected to the cylinder, is provided. A fastener magazine is connected to the back, a pusher attached to the fastener magazine is urged toward the nose by a spring, and a rear end face of the connection type fastener loaded in the fastener magazine is pushed forward by a pusher to supply the fastener into the nose. In a fastening machine in which a trigger lever pushes a trigger valve stem to activate a piston and a driver drives the first fastener, the lever is pivotally attached to the trigger lever and the upper end of the lever is rotated within a range including a position facing the trigger valve stem. Movable, lever interposed with spring The upper end of the lever is biased in a direction to be displaced from the position facing the trigger valve stem, and when the fastener is loaded into the fastener magazine, the lower end of the lever is turned on the fastener or the upper surface of the pusher, and the lever is rotated. The upper end of the is opposed to the trigger valve stem, and by operating the trigger lever, the trigger valve stem is pushed through the lever to start the fastening machine, and the pusher moves forward with the consumption of the fastener, The engagement between the pusher and the lever is released, the lever rotates to the initial position, and the upper end of the lever is displaced from a position facing the trigger valve stem, and the trigger valve stem is pushed through the trigger lever and the lever. The present invention provides an apparatus for preventing a blanking of a fastening machine configured to be impossible. .

A lever is pivotally attached to the trigger lever, and the upper end of the lever is rotatable within a range including a position facing the trigger valve stem. To the position opposite to
By operating the trigger lever, the trigger valve stem is pushed through the lever to form the fastening machine, and a lever pusher portion such as a claw or a roller is provided on the upper surface of the pusher. When the lever moves forward, the lever pusher pushes the lower part of the lever to rotate, and the upper end of the lever is displaced from a position facing the trigger valve stem, and the trigger valve stem is pushed through the trigger lever and the lever. The present invention provides an apparatus for preventing a blanking of a fastening machine, which is configured to be impossible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a pneumatic driven nail driver 1
2 is a cylinder housing part, 3 is a grip part, and a pneumatic cylinder (not shown) is built in the cylinder housing part 2. An elongated rod-shaped driver (not shown) is connected to the lower surface of the piston in the pneumatic cylinder, and the driver slides in a nose 4 attached to the lower end surface of the cylinder housing 2.

The nose 4 includes a driver guide plate 5 having a vertical groove for guiding a driver, and a front cover plate 5 attached to the front (left side in the figure) of the driver guide plate 4. A nail magazine 7 is connected to the back of the driver guide plate 5, and a rear portion of the nail magazine 7 is connected to the grip portion 4 although not shown.

The nail magazine 7 includes a nail guide 8 and a pusher 9.
And is constituted by. The nail guide 8 arranges two plate-shaped parts in parallel at an interval substantially equal to the interval between the two legs of the nail so as to face each other, and inserts a connecting nail into a groove between the two plate-shaped parts. The guide guides the connecting nail, and includes a nail guide 8
A compression coil spring 10 is interposed between a pusher 9 slidable in the groove and a rear portion of the nail guide 8 to constantly urge the pusher 9 forward.

The connecting nail is set in the nail guide 8 by sliding the pusher 9 backward by hand, and when the hand is released from the pusher 9, the pusher 9 contacts the rear end face of the connecting nail and moves the connecting nail forward. The leading nail is inserted into the nose 4 through a hole formed in the driver guide plate 5 and stops in contact with the inner surface of the front cover plate 6.

Next, the idling prevention device will be described. An elongated hole 1 is located between the finger-holding portion of the trigger lever 11 and the pivot point.
1a is formed, and a bracket 11b protruding downward from the side of the elongated hole 11a is provided. Bracket 1
A lever 13 is pivotally attached to a pin 12 attached to the lever 1b.
The lever 13 is urged to rotate in the counterclockwise direction in the figure by a tension coil spring 14 provided on the cylinder housing portion 2 in front of the lever 3.

The position of the fulcrum of the lever 13 is located slightly forward of the position of the trigger valve stem 15 and, as shown in FIG. 1, when no nail is loaded in the nail magazine 7,
The lower end of the lever 13 enters the groove of the nail guide 8, and the upper end is at a position displaced forward from a position immediately below the trigger valve stem 15. Therefore, in this state, the trigger lever 1
Even if the user pulls 1, the trigger valve stem 15 enters the elongated hole 11a of the trigger lever 11, and the trigger lever 11 is swung, so that the trigger valve stem 15 cannot be pushed.

As shown in FIG. 2, when the connecting type nail is loaded in the nail guide 8, the lever 13 is pushed up by the head of the connecting nail N in the nail guide 8 or the upper surface of the pusher 9, as shown in FIG. When the lever 13 rotates clockwise from the state,
Is located substantially directly below the trigger valve stem 15.

When the trigger lever 11 is pulled in this state, the pivot of the trigger lever 11 causes the fulcrum of the lever 13 to move along a circular locus, and the lever 13 itself also turns counterclockwise. The upper end of the lever 13 pushes up the trigger valve stem 15 to turn on the trigger valve 16 and activate the pneumatic cylinder to perform nailing.

Then, the connecting nail N and the pusher 9 are advanced with the consumption of the nail, and the remaining amount of the nail is zero since the lower end of the lever 13 is in contact with the upper surface of the pusher 9 following the connecting nail N. Alternatively, the lower end of the lever 13 which was in contact with the upper surface of the pusher 9 when it became small is disengaged from the pusher 9, and the lever 13 rotates counterclockwise, as shown in FIG. 8, the upper end is displaced from a position immediately below the trigger valve stem 15 so that the trigger lever 11 cannot be operated by the trigger valve stem 15.

As described above, since the trigger lever 11 is not mechanically locked, even if the trigger lever 11 is operated in the start / stop state shown in FIG. Is not added, and there is no risk of damaging or deforming the mechanical parts.

The idle hit prevention device shown in FIG.
A roller 22 is provided at the upper end of the rear end 1 so that when the pusher 21 moves to the front end position, the roller 22 pushes the lower part of the lever 24 pivotally attached to the trigger lever 23 to rotate it. The rotation direction of the lever 24 in this case is
The direction of rotation of the lever 13 shown in FIGS. 1 and 2 is opposite, and as shown in FIG. 3, when no nail is loaded in the nail magazine 7, the lever 24 is moved to the position of the pusher 21 in the advanced position. When the trigger lever 23 is rotated, the upper end of the lever 24 does not rise to the position of the trigger valve stem 15 even when the trigger lever 23 is rotated. 15 is in a start / stop state where the user cannot press the key.

On the other hand, as shown in FIG. 4, when the nail N is loaded into the nail magazine 7, the pusher 21 retreats, the pressing of the roller 22 is released, and the lever 24 rotates counterclockwise. The upper end of 24 rises and is located immediately below the trigger valve stem 15, and the trigger valve operation by the trigger lever 23 becomes possible.

The above description has been given of the idle driving prevention device of the nailing machine. However, it is needless to say that the above-described idle driving prevention device can be diverted to a staple driving machine having the same basic configuration as the nail driving machine. Further, the present invention is not limited to the above embodiments, and various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications.

[0022]

As described above, the apparatus for preventing idle driving of a fastening machine according to the present invention is configured so that the trigger valve stem is pushed through the lever mounted on the trigger lever, and when the fastener is used up or when the fastener is used up. When the remaining amount becomes small, the lever is displaced from the position immediately below the trigger valve stem so that the trigger valve stem cannot be pushed, so that the blanking can be reliably prevented. In addition, since the trigger lever is not mechanically locked, stress is not applied to the trigger lever even if the trigger lever is operated without mounting the fastener, and deformation or breakage of mechanical parts such as the trigger lever and pusher is not caused. There is no fear.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an idle hit prevention device according to claim 1 in a start-stop state.

FIG. 2 is a sectional view showing a state in which the idle driving prevention device of FIG. 1 can be activated.

FIG. 3 is a cross-sectional view showing the idle hit prevention device according to claim 2 in a start / stop state.

FIG. 4 is a cross-sectional view of a state in which the idling prevention device of FIG. 3 can be activated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nail driver 4 Nose 5 Driver guide plate 6 Front guide plate 7 Nail magazine 8 Nail guide 9 Pusher 11 Trigger lever 11a Slot 11b Bracket 13 Lever 14 Tension coil spring 15 Trigger valve stem 16 Trigger valve 21 Pusher 22 Roller 23 Trigger lever 24 lever

Claims (2)

[Claims] 1. A driver is connected to a piston in a cylinder built in a casing, a fastener magazine is connected to the back of a nose which is a driver guide connected to the cylinder, and a pusher mounted on the fastener magazine is moved in the direction of the nose by a spring. Energize and push the rear end face of the connected fastener loaded in the fastener magazine forward with a pusher to supply the fastener into the nose, while pressing the trigger valve stem with the trigger lever to activate the piston and driving the top fastener with the driver In a fastening machine, a lever is pivotally attached to a trigger lever, the upper end of the lever is rotatable within a range including a position facing the trigger valve stem, and a spring is interposed in the lever so that the upper end of the lever is connected to the trigger valve stem. In the direction of displacement from the opposing position And energized,
When the fastener is loaded into the fastener magazine, the lower end of the lever is turned on the fastener or the upper surface of the pusher, and the upper end of the lever is located at a position facing the trigger valve stem, and the lever is operated by operating the trigger lever. The trigger valve stem is pushed through to start the fastening machine, and the pusher moves forward with the consumption of the fastener, so that the engagement between the pusher and the lever is released, the lever rotates to the initial position, and the lever is moved to the initial position. The upper end is displaced from the position facing the trigger valve stem,
An idle hit prevention device for a fastening machine, wherein a trigger lever and a trigger valve stem through the lever cannot be pushed. 2. A driver is connected to a piston in a cylinder built in a casing, a fastener magazine is connected to the back of a nose which is a driver guide connected to the cylinder, and a pusher mounted on the fastener magazine is moved in the direction of the nose by a spring. Energize and push the rear end face of the connected fastener loaded in the fastener magazine forward with a pusher to supply the fastener into the nose, while pressing the trigger valve stem with the trigger lever to activate the piston and driving the top fastener with the driver In a fastening machine, a lever is pivotally attached to a trigger lever, the upper end of the lever is rotatable within a range including a position facing the trigger valve stem, and a spring is interposed in the lever so that the upper end of the lever is connected to the trigger valve stem. Hold at the opposing position and By operating the key, the trigger valve stem is pressed via the lever to start the fastening machine, and a lever pusher portion such as a claw or a roller is provided on the upper surface of the pusher. By moving forward, the lever pusher rotates by pressing the lower part of the lever, and the upper end of the lever is displaced from the position opposed to the trigger valve stem. Prevention device for non-firing of fastening machine that is configured to be impossible.