JPH0228007Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a dry-driving prevention device for preventing a dry-driving operation performed in a nail-driving machine when no nails remain.

(Prior Art) Examples of conventional techniques include, for example, Japanese Utility Model Publication No. 14391/1982 and Publication No. 3726 of 1983.

(Problems to be Solved by the Invention) The purpose of the invention is to solve the problems in which the mechanism for preventing blank firing is complicated and tends to malfunction.

(Means for Solving the Problems) The present invention includes a first protrusion protruding from a driver guide having an ejection passage, and a second protrusion protruding from a safety lever attached to the driver guide so as to be movable relative to the driver guide. A stopper is installed between the protrusion and the stopper so as to be elastically displaceable and interposed between the protrusions to restrict the approach of the protrusions when the remaining amount of the nail decreases below the limit. The gist of the present invention is to provide a dry firing prevention device which is provided with a detection means for retracting the stopper from between the two protrusions using the remaining nail when the remaining nail exceeds a limit and canceling the approach restriction.

(Function) The dry driving prevention device of the present invention has a stopper biased by a spring interposed in the gap between the first protrusion protruding from the driver guide side and the second protrusion protruding from the safety lever side. When the number of nails decreases, the approach between the two protrusions is restricted, and when the nail remains, the remaining nail displaces the stopper to release the restriction on the proximity of the two protrusions.

(Example) Next, a first example of the present invention will be described with reference to FIGS. 1 to 5.

The driver guide 1 is installed vertically below the front end of the nail gun main body H, and has a driving passage 2 in the center thereof in a vertical shape for driving nails downward.
A first protrusion 3 is provided protruding from one side near the center.

The magazine 4 is tilted between the rear end of the nailer main body H and the driver guide 1, and the magazine 4 has nails K~
In order to feed K into the punching passage 2, a feeding passage 5 communicating with the punching passage 2 is formed in a forward-slanting shape.

The trigger 6 is pinned so as to be tiltable so as to face a trigger valve 7 for driving and controlling the driver (D in Fig. 9), and an idler 8 opposite to the trigger valve 7 is tilted near the center of the trigger 6. Possibly pinned.

The safety lever 9 is movable relative to the driver guide 1 in its axial direction, and is attached so that its lower end slightly protrudes below the ejecting surface of the tip of the driver guide 1.
7, and its upper end is opposed to the idler 8 so that it can be pushed up, and a gap 1 is formed below the first protrusion 3 of the driver guide 1 in the vicinity of its lower part.
A second protrusion 11 is formed so as to protrude from the bottom end of the safety lever 9, and when the lower end of the safety lever 9 protrudes from the ejection surface of the driver guide 1, it is impossible to push up the trigger valve 7 by tilting the trigger 6. Meanwhile, the driver guide 1 advances with the safety lever 9 in pressure contact with the surface to be driven, and the safety lever 9
When the idler 8 is pushed up, the trigger valve 7 can be pushed up by the idler 8 by tilting the trigger 6.

A pusher 15 inserted into the feeding passage 5 to push the nail K forward in the feeding passage 5 is fixed to the outer end of a mainspring spring 16 wound around the side of the driver guide 1. The feed pawl 15a formed at the front end is in contact with the nail K at the rearmost end.

A spring 12 shaped like a leaf spring and capable of being elastically deformed in the cross-sectional direction of the driver guide 1 is fixed to the front part of the magazine 4 with a rivet 13, and a protrusion 12 is attached to the front part of the magazine 4.
The rotation is stopped by a, and there is a feeding passage 5 near the front end of the rotation.
In order to detect the presence or absence of the nail K inside, the detection part 12b inserted near the end 5a of the feeding passage 5 is bent and formed, and the front end thereof has both protrusions interposed between the protrusions 3 and 11. The driver guide 1 is elastically displaceable in the cross-sectional direction of the driver guide 1 and moves in and out of the gap 10 in order to restrict the approach of the protrusions 3 and 11 and to release the restriction on the approach of both the protrusions 3 and 11 by retracting them from the gap 10. When the stopper 14 is attached and more nails K than the limit remain in the vicinity of the end 5a in the feeding passage 5, the detection part 12b is pushed out by the remaining nails K, and the stopper 14 is moved into the gap 10. The driver guide 1 is allowed to advance, and the nail K can be driven out from the driving path 2.
When the number of nails K remaining near the end 5a in the feeding passage 5 decreases below the limit, the detection portion 12b of the spring 12 protrudes into the feeding passage 5, and the stopper 14
advances into the gap 10, the protrusions 3 and 11 are restricted from approaching each other, the relative positions of the driver guide 1 and the safety lever 9 are locked, and the nail driving operation becomes impossible.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, a first protrusion 3 protrudes from the driver guide 1 having a nail K driving passage 2, and a safety lever 9 protrudes from the driver guide 1 so that its relative position can be displaced in the axial direction. A stopper 14 is elastically displaceable between the second protrusion and the second protrusion, which is interposed between the protrusions 3 and 11 to restrict the approach of the protrusions 3 and 11 when the remaining amount of the nail decreases below the limit. At the same time, when the nail K remains above the limit, the spring 12 is used to evacuate the stopper 14 from between the protrusions 3 and 11 and release the restriction on the approach between the protrusions 3 and 11. A detecting section 12b formed in is provided.

Therefore, the detection portion 12b of the spring 12 accurately detects the remaining amount of the nail K in the feeding passage 5, and the operation of the safety lever 9 is permitted depending on the presence or absence of the nail K near the end 5a in the feeding passage 5. This has the effect of accurately regulating the nail driving operation when the remaining amount of nails K has decreased below the limit, and simplifying the mechanism for preventing this dry driving.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 9.
Both protrusions 5 are attached to the tip of a spring 62 in order to advance into and retreat from the gap 60 between the protrusion 53 and the second protrusion 61 on the safety lever 59 side.
The stopper 64 interposed between 3 and 61 has a detection part 64a projecting from its upper part so as to be able to enter into the driving passage 52, and when the nail is not in the driving passage 52, the detection part 64a detects that the nail is not inserted into the driving passage 52. The stopper 64 protrudes into the passage 52 and advances between the protrusions 53 and 61 (see FIG. 9A), restricting the protrusions 53 and 61 from approaching each other, while the nail K stops at the end in the feeding passage 55. When the nail K is fed into the punching passage 52, the detection part 64a is pushed by the nail head K1 of the nail K in the punching passage 52 and retreats to the outside of the gap 60 (see FIG. 9B).
The restriction on the proximity of both the protrusions 53 and 61 is released, and the nail driving operation becomes possible.

In particular, in this example, since the stopper 64 is configured to be displaced when the nail K is fed into the driving passage 52, the dry driving prevention function is activated after all the nails in the nail passage are driven out. be able to.

Note that the other functions and effects of the second embodiment are substantially the same as those of the first embodiment, so their explanation will be omitted.

(Effects of the invention) That is, the present invention has a first protrusion protruding from a driver guide having a nail driving passage, and a second protrusion protruding from a safety lever attached to the driver guide so as to be movable relative to the driver guide. A stopper is installed between the two protrusions so as to be elastically displaceable and interposed between the two protrusions to restrict the approach of the two protrusions when the remaining amount of the nail decreases below the limit. By providing a detection means for retracting the stopper from between the protrusions and releasing the access restriction using the remaining nail when the remaining nail remains, the remaining amount of the nail can be accurately detected. This has the effect of preventing a blank firing operation and simplifying the blank firing prevention mechanism.

[Brief explanation of drawings]

Figures 1 to 5 show the first embodiment of the present invention. Figure 1 is a side view of the main parts, Figure 2 is a front view, and Figure 3 is taken along the line W-W in Figure 1. 4 is a cross-sectional view taken along the line X-X in FIG. 2, and FIG.
6 to 9 show the second embodiment. FIG. 6 is a side view of the main parts, FIG. 7 is a front view, and FIG. 8 is a Z-axis view of FIG. -Z line sectional view, and FIGS. 9A, 9B, and 9C are vertical sectional views illustrating the interlocking operation of the nail and the stopper. 1,51... Driver guide, 3,53... First protrusion, 9,59... Safety lever, 11,61
...Second protrusion, 14,64...Stopper, K...
nail.

Claims (1)

[Scope of utility model registration request] There is a remaining amount of nails between a first protrusion protruding from a driver guide having a nail driving passage and a second protrusion protruding from a safety lever attached to the driver guide so as to be movable relative to the driver guide. A stopper is installed between the two protrusions so as to be elastically movable to restrict the approach of the two protrusions when the nail decreases below the limit, and when the nail remains above the limit, the remaining nail A dry-driving prevention device for a nailer, characterized in that a detecting means is provided for retracting the stopper from between the protrusions with a nail and canceling the approach rule.