JPH0929663A - Unloaded nailing preventer for nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock an operation of a trigger lever for starting a nailing machine and prevent a driven material from a break caused due to the unloaded nailing by engaging a projecting part of a pusher with an operating member in the reduction of fasteners in a magazine to move the operating member from a first position to a second position. SOLUTION: When a trigger lever 4 in starting is pivoted counterclockwise, an operating member 14 is in a first position (lower position), so that a valve stem 12 of a starting valve is pushed to be started by the operation of the trigger lever 4. On the other hand, as fasteners 7 in a magazine 3 are consumed, a pusher 10 is moved forward. When the remaining amount of the fasteners 7 reaches a predetermined one, a projecting part 16 of the pusher 10 pivots an L-shaped lever 15 and when the remaining fasteners 7 are reduced to 2-3 ones, the L-shaped lever 15 engages the lower end of the operating member 14 and pushes up the lower end to a second position. Thus, the operation of the trigger lever 4 is blocked to prevent the unloaded nailing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blank driving prevention device for preventing blank driving of a nail driving machine.

[0002]

2. Description of the Related Art In many cases, a contact arm is provided as a means for preventing idle driving in this type of nail driving machine. The contact arm is a member that is arranged so as to project to the front of the nose portion, is pressed against the material to be driven, and is a member for activating the nail driving machine in cooperation with the trigger lever. By engaging the pusher for urging forward and the contact arm to prevent the operation of the contact arm, the nailing machine can be operated when the fastener in the magazine becomes empty or when the fastener becomes less than a certain amount. It is designed not to start.

[0003]

However, the above-mentioned mechanism is premised on that the nailing machine is provided with the contact arm, and in the nailing machine for driving the small tacker or the fastener of extremely small size, the nailing section is not provided. It is difficult to equip the contact arm because the driving part becomes difficult to see if an extra mechanism is attached to the. Therefore, even in these nail driving machines, when the fasteners in the magazine are exhausted, the driver may project from the nail driving section to damage the surface of the material to be driven, and the function of preventing blank driving is necessary.

In view of the above, the present invention solves the above-mentioned problems and prevents even a small nailing machine that cannot be equipped with a contact arm from having a simple structure by providing a mechanism for preventing blanking. It is an object to provide a device.

[0005]

In order to solve the above-mentioned problems, an idle-driving prevention device for a nailing machine according to the present invention is a magazine provided with a pusher for accommodating a fastener and for urging the fastener by pushing it into a launching path. And a striking mechanism that shock-drives a driver that reciprocates in the striking path to strike a fastener, and a manually operable trigger lever that activates the striking mechanism. The actuator is pivotally supported on the housing, and the movable actuating member is disposed between the pivotally attached portion of the trigger lever and the pusher in a first position allowing the operation of the trigger lever and a second position preventing the operation of the trigger lever. At the same time, a part of the pusher is projected from the upper surface of the magazine to form a projection, and the projection is engaged with the actuating member when the number of fasteners in the magazine decreases. And wherein moving the actuating member from the first position to the second position.

The protrusion of the pusher may be directly engaged with the actuating member when the number of fasteners in the magazine is reduced, or may be indirectly engaged with the actuating member.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a nailer which is generally called a tucker and drives a fastener (a staple bent in a U-shape) into a material to be driven. In the housing, a striking mechanism (not shown) is provided in the housing 1, a punching section 2 is provided below the housing 1, and a magazine 3 is continuously provided in the punching section 2.

The striking mechanism is actuated by the trigger lever 4, and here the driver 5 is shockedly driven by compressed air. When the driver 5 reciprocates in the launching path 6 of the launching section 2 and is driven downward. Then, the fastener 7 supplied into the driving path 6 is driven from the driving section 2.

Further, the fastener 7 is supplied from the magazine 3 to the ejection section 2. The magazine 3 has a guide path 8 for accommodating the fastener 7, and a pusher 10 for constantly urging the fastener 7 on the guide path 8 by the spring 9 to the ejection path 6.
Are provided.

By the way, the striking mechanism is provided with the trigger lever 4
It is started by manually operating. The trigger lever 4 is pivotally supported by a support shaft 11 provided in the nailer housing 1, and is provided so as to be able to press a valve stem 12 of a starting valve that activates the striking mechanism. A protrusion 13 is formed on the base of the trigger lever 4.

An actuating member 14 is provided between the pivotally attached portion of the trigger lever 4 and the pusher 10. Actuating member 14
The upper end of the first lever engages with the lower surface of the protrusion 13 of the trigger lever 4 (the position shown in FIG. 1) and the second position engages with its front end surface.
Is movably arranged between the first position and the second position, and is biased toward the first position by a spring (not shown).

An L-shaped lever 15 is rotatably supported by a shaft 18 provided on an upper protruding piece 17 of the magazine 3 between the operating member 14 and the pusher 10. And, one piece 15a of the L-shaped lever 15 is the actuating member 14
Of the pusher 10 is engaged with the lower end of the pusher 10, and the other piece 15b is provided so as to be engageable with the projecting portion 16 projecting above the front portion of the pusher 10. The projecting portion 16 projects above the magazine 13 through an elongated hole 19 formed in the upper surface of the magazine 30 and extending in the longitudinal direction.

With the above construction, when the trigger lever 4 is rotated counterclockwise in FIG.
Is held in the first position, the valve stem 12 of the starting valve can be pushed and actuated by operating the trigger lever 4. When the fastener 7 in the magazine 3 is consumed little by little, the pusher 10 also moves forward by the amount consumed. When the remaining amount of the fastener 7 on the guide path 8 decreases in this way, the protrusion 16 of the pusher 10 engages with the piece 15b of the L-shaped lever 15 and rotates it as shown in FIG. When the remaining fasteners 7 become a few, the other piece 15a of the L-shaped lever 15
Engages with the lower end of the actuating member 14 and pushes it up
Move to the position. Therefore, even if an attempt is made to operate the trigger lever 4, its front end face engages with the upper end of the operating member 14 and cannot rotate, so that the operation is blocked.

By the way, in the above example, the projecting portion 16 of the pusher 10 is engaged with the actuating member 14 via the L-shaped lever 15, so that the actuating member 14 is moved from the first position to the second position. However, the present invention is not limited to this, and the protrusion 16 of the pusher 10 may be directly engaged with the operating member 14. For example, as shown in FIG. 4, the front portion of the upper end of the protruding portion 16 of the pusher 10 is used as a slanted guide surface, and the number of fasteners 7 is reduced so that the protruding portion 16 of the pusher 10 moves forward to engage with the lower end of the operating member 14. The actuating member 14 that was in the first position when mated
The lower end of the guide 16 may be guided by the guide surface to move up to the second position as shown in FIG. 5, and contact the upper end of the protrusion 16.

[0015]

When the number of fasteners in the magazine is reduced, the protrusion of the pusher is engaged with the actuating member to move the actuating member from the first position to the second position, thereby starting the nailing machine. The operation of the trigger lever can be locked to prevent damage to the driven material due to blank driving. Therefore, even a small nailing machine that cannot have a contact arm can be equipped with a mechanism for preventing blank driving.

Further, since it is not necessary to provide an additional member around the punched-out portion of the fastener such as the conventional contact arm, nailing to a corner or a narrowed portion can be performed without any trouble.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part of a blank driving prevention device for a nail driving machine according to the present invention.

FIG. 2 is an explanatory diagram of an operating state of the above-described blank driving prevention device when the operating member is in the first position.

FIG. 3 is an explanatory view of an operating state of the above-described blank driving prevention device when the operating member is in the second position.

FIG. 4 is an explanatory view of a main part of another blank driving prevention device.

FIG. 5 is an explanatory diagram of an operating state of the above-mentioned blank hitting prevention device.

[Explanation of symbols]

 1 Nailer Housing 3 Magazine 4 Trigger Lever 5 Driver 6 Launch Path 7 Fastener 10 Pusher 14 Operating Member 16 Projection

Claims (1)

[Claims] 1. A magazine having a pusher for accommodating a fastener and urging the fastener to a drive-out path, and a striking mechanism for shock-driving a driver that drives the fastener back and forth in the drive-out path. In a nailing machine having a manually operable trigger lever for activating the striking mechanism, the trigger lever is pivotally supported on the nailing machine housing, and the trigger lever can be operated between the pivot lever attachment portion and the pusher. The movable member is arranged at the first position and the second position at which the operation is blocked, and a part of the pusher is projected from the upper surface of the magazine to form a protruding portion. When the protrusion is reduced, the protrusion is engaged with the actuating member to move the actuating member from the first position to the second position. Prevention device.