JP3209032B2 - Driving prevention mechanism for driving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing an idle driving of a driving machine which prevents the operation of the driving machine when there is no stop.

[0002]

2. Description of the Related Art An idle hit prevention mechanism of a driving machine for preventing the push lever 4 from moving upward when the stopper 2 is lost and preventing the trigger 5 from being operated is well known. It is shown in FIG. In FIG. 3, when the stopper 2 is present, when the tip 4 a of the push lever 4 around the tip 6 a of the injection unit 6 from which the stopper 2 is punched is pressed against the material 7 to be pushed, the push lever 4 is pushed up. The upper end 4b of the push lever in the vicinity of the trigger 5 is disengaged from the trigger locking portion 5a so that the trigger 5 can be operated. When the trigger 5 is operated, the stopper 2 sent into the ejection portion 6 by the feeder 3 is released. The material to be driven 7 is driven by the driving rod 8. Stopper 2
When there is no, the end 3a of the feeder 3 protrudes into the gap 9 above the push lever locking portion 4c as shown in FIG. Therefore, the trigger 5 cannot be operated because the upper end 4a of the push lever 4 does not come off the trigger locking portion 5a, and the driving rod 8 is not driven. That is, a blank hit is prevented.

[0003] Above the feeder end 3a, there is a wall 10a of a guide member 10 forming the injection section 6, which prevents the feeder end 3a from moving upward when the push lever 4 is raised. . The lower surface 3b of the feeder end 3a and the push lever lock portion 4c are engaged with the lower surface 3b of the feeder end 3a and the push lever lock portion 4c so that when the push lever 4 rises and is fitted with the feeder end 3a, the push lever 4 is hardly disengaged. An inclined surface 11 is provided on each of the opposing surfaces of the portion 4c.

The fitting amount d between the feeder end 3a and the push lever locking portion 4c must be set smaller than the thickness of the stopper 2 so that the remaining amount of the stopper 2 can be sensed. In particular, in a finishing driving machine in which the thickness of the fastener 2 used is small, the fitting amount d is 1.25 mm or less because the thickness of the finish fastener 2 is 1.25 mm. Further, since a finish driving machine is desired to have a shape capable of driving into a narrow place, the vicinity of the tip 6a of the injection section is made as thin as possible. For this reason, the thickness e of the feeder end 3a cannot be increased due to the relationship with other components. Generally, since the width of the finishing stopper 2 is 1 mm, the feeder 3 for sending out the finishing stopper 2 is a pressed product of a 1 mm thick steel plate for economic reasons. E is 1mm
It is.

[0005]

In the conventional hitting prevention mechanism of a finishing driving machine, the fitting amount d between the feeder end 3a and the push lever locking portion 4c is determined by the relationship between the thickness of the finishing stopper 2 and the thickness d of the finishing stopper 2. The thickness e of the feeder end 3a is 1 mm because the pressed product is a 1.25 mm or less and a 1 mm steel plate is used for economic reasons. For this reason, when an excessive force acts in the push-up direction of the push lever 4 due to dropping of the driving machine body 1 or the like, the push lever locking portion 4c hits the feeder end 3a as shown in FIG. The lower surface 3b has a crack, and the function of the slope 11 that makes it difficult for the feeder end 3a and the push lever locking portion 4c to come off is weakened. The corner 3c may be damaged. If the corner 3c of the feeder end 3a fitted with the push lever locking portion 4c is damaged, the feeder end 3a will not lock the push lever locking portion 4c. 4 rises, and there is a problem that it does not function as an idle hit prevention mechanism.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a durable idle hit prevention mechanism which eliminates a failure of the idle hit prevention mechanism caused by accidental dropping of the driving machine body and the like.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a feeder end upper surface and a guide member wall facing the feeder end upper surface with uneven portions which mesh with each other when the feeder upper surface and the guide member wall are fitted. Is achieved by

[0008]

When the push lever is pressed against the material to be driven when there is no stop, the idle hit prevention mechanism configured as described above can be used.
The push lever locking portion pushes up the feeder end, and the upper surface of the feeder end and the uneven portion of the guide member wall mesh with each other. For this reason, due to an accidental drop of the driving machine body or the like, a somewhat excessive force acts in the push lever push-up direction, and the push lever locking portion hits the feeder end, and a crack is formed on the lower surface of the feeder end having a small strength. In addition, since the upper surface of the end of the feeder and the uneven portion of the guide member wall are engaged with each other, it is possible to prevent the feeder from retreating and to prevent the corner of the feeder end from being damaged . Also, feeder end corner
Even if the part has been damaged,
The feeder retracts because the irregularities on the
Ru can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. In the present invention, as shown in FIG.
A convex portion 10b protruding downward is provided at the bottom of the bottom portion 0a, and a concave portion 3 meshed with the convex portion 10b is formed on the upper surface of the feeder end 3a.
e, the feeder end 3a
Moves forward with the decrease in the stopper 2, and the positions of the protrusions 10 b and the recesses 3 e are set so that the recesses 3 e mesh with the protrusions 10 b when the stoppers 2 disappear. Accordingly, in the state of FIG. 2 in which the stopper 2 is eliminated and the concave portion 3e of the feeder end 3a is engaged with the convex portion 10b of the guide member 10, the driving machine main body 1 falls and an excessive force is applied in the pushing up direction of the push lever 4. And the lower surface 3b of the feeder end 3a is deformed,
The retreat of the feeder end 3a is prevented by the engagement between the concave portion 3e and the convex portion 10b, so that the corner 3c of the feeder end 3a can be prevented from being damaged . Also, the corner 3c is broken.
Even if it is damaged, the concave portion 3e and the convex portion 10b may bite.
To prevent the feeder end 3a from retreating
Door is Ru can. As a result, the idle hit prevention mechanism does not break down, and the idle hit can be reliably prevented, and a safe driving machine can be provided.

In the above embodiment, the feeder end 3a
The concave portion 3e is provided on the upper surface of the
Although 0b is provided, a protrusion may be provided on the feeder end 3a and a recess may be provided on the guide member 10, and the operation and effect are the same as those in the above embodiment.

[0011]

As described above, according to the present invention, the end of the feeder for preventing the push lever from being raised is prevented from retreating due to the force acting when the driving machine is accidentally dropped. This prevents the corner of the feeder end that locks to the push lever locking part from being damaged, so that the feeder end can securely lock the push lever locking part, and Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an embodiment of a driving machine provided with an idle hit prevention mechanism of the present invention.

FIG. 2 is an enlarged view of a portion A of FIG. 1 showing a state in which the prevention mechanism of the present invention is operated.

FIG. 3 is a partial cross-sectional side view showing a driving state.

FIG. 4 is a sectional side view showing an example of a conventional driving machine.

FIG. 5 is an enlarged view of a portion B in FIG. 4;

FIG. 6 is an enlarged view of a portion B in FIG. 4 showing a state in which an end of the feeder in FIG. 4 is damaged.

FIG. 7 is a sectional view taken along line CC of FIG. 4;

[Explanation of symbols]

1 is a main body, 2 is a stopper, 3 is a feeder, 3a is a feeder end, 3e is a concave portion, 4 is a push lever, 4c is a push lever locking portion, 6 is an injection portion, 9 is a gap portion, and 10 is a guide member. Reference numeral 10a denotes a wall of the guide member 10, and 10b denotes a projection.

Claims (1)

(57) [Claims] 1. An ejection section from which a stopper is driven, a feeder for feeding the stopper into the ejection section, a guide member forming the ejection section, a trigger for controlling the driving operation, and a tip and an upper end of which are around the ejection section and the upper end, respectively. A push lever that is located near the trigger and usually disables the trigger at the lower position and is pushed up when the tip of the injection unit is pressed against the material to be driven, and a push lever that enables the trigger operation and a push lever when there is no stop feeder with protruding gap portion of the lever engaging portion upwardly to prevent the increase of the push lever in driving machine having a feeder end to inoperable trigger, providing a concave or convex portion on the upper surface of the feeder end Above the end of the feeder when
A concave or convex part at the end of the feeder at the bottom of the guide member
Fastening tool runaway protection mechanism characterized by fittable that the projections or recesses digits set with.