JPH0453908Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic nailing machine that drives fasteners such as nails using compressed air as a power source.

[Background of the idea]

A conventional nailing machine will be explained with reference to FIGS. 2 and 3. As is well known, the nailing machine includes a cylinder 3 provided in a housing 1, a piston 2 that reciprocates within the cylinder 3 using compressed air as a power source, and a piston 2 that is provided integrally with the piston 2. It has a striking rod 4 for striking the nail, a damper 11 for absorbing the impact force of the piston 2 during striking, and a return accumulation chamber 7 for accumulating the air in the lower part of the piston compressed by the descent of the piston 2. Further, 5 is a magazine for storing fasteners such as nails, and 6 is an air storage chamber for storing compressed air used for hitting.

In the above structure, the operation at the time of impact will be explained. Compressed air enters the upper surface of the piston 2, the piston 2 rapidly descends, and the striking rod 4 strikes the stop, and at the same time the air on the lower surface of the piston 2 is compressed as the piston 2 descends, causing return accumulation on the outer periphery of the cylinder 3. Accumulated in chamber 7. The piston 2 is returned to its original position by the compressed air accumulated in the return accumulation chamber 7. In the above configuration, if the capacity of the return storage chamber 7 is small, the pressure change due to the reciprocating motion of the piston 2 will be large, and the pressure will increase in the striking process and the striking force will become small, and the piston 2 will return in the returning process as well. The pressure of compressed air decreases,
There may be cases where the piston 2 does not return to the top dead center.
Therefore, the larger the capacity of the return accumulation chamber 7, the better. However, if the capacity of the return accumulation chamber 7 on the outer periphery of the cylinder 3 is increased, the girth of the housing 1 becomes larger, and as shown in FIG. It had the disadvantage that it made my sexuality worse.

[Purpose of invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to increase the capacity of the return storage chamber without changing the shape of the housing.

[Summary of the idea]

The present invention focuses on the fact that there is wasted space between the housing and the injection port that guides the striking rod during nail driving work, and the present invention aims to create a storage chamber that returns to the upper part of the injection port without increasing the capacity of the storage chamber on the outer periphery of the cylinder. It is designed to allow compressed air to be stored in the damper as well.

[Example of idea]

An embodiment of the present invention will be explained in detail with reference to FIG. The operations of the nailing machine other than the storage chamber 9 and the cavity 13 are the same as those of the conventional art, so the same reference numerals are given and the explanation thereof will be omitted. A plate 12 is provided on the lower surface of the damper 11 that absorbs the impact force, and a return accumulation chamber 9 is formed around the upper part of the injection port 8. The return accumulation chamber 9 is sealed by the end surface of the housing 1, the plate 12, and the damper 11. There is. Further, the damper 11 is provided with a cavity 13, and the plate 12 is provided with an opening 14 so that the cavity 13 and the return storage chamber 9 communicate with each other, so that compressed air is stored in the cavity 13 as well.

As described above, the present invention increases the volume by providing a return accumulation chamber 9 for accumulating compressed air in the conventional wasted space 15 shown in FIG. Therefore, the pressure change at the lower part of the piston 2 can be reduced. In other words, when the piston 2 descends, the increase in air pressure below the piston 2 is reduced to increase the impact force, and when the piston 2 returns, the piston 2
It is possible to reduce the decrease in the pressure of the compressed air used to return the screws and eliminate nail driving failures due to failure of the piston 2 to return during low-pressure operation, thereby improving the workability of the nailing machine.

Further, conventionally, the impact of the piston 2 was received only by the damper 11, but in the present invention, the air in the cavity 13 of the damper 11 and the return accumulation chamber 9 at the bottom of the damper 11
Since it is received by the air inside, the impact force of the piston 2 transmitted to the main body via the damper 11 and the plate 12 is reduced, which improves the life of the main body and reduces vibrations transmitted to the operator, improving work efficiency.

Furthermore, since the return storage chamber 9 is formed in the shape of a pot bottom around the upper portion of the injection port 8, the bending strength of the base portion of the return storage chamber 9, which is weak in strength, is improved. Further, since the damper 11 is in contact with the compressed air through the cavity 13, an additional effect can be obtained in that the heat generated by the impact energy applied to the damper 11 can be cooled down.

[Effect of idea]

According to the present invention, the capacity of the return accumulation chamber on the outer periphery of the cylinder can be increased without changing the capacity of the return accumulation chamber, which reduces the pressure change at the bottom of the piston, eliminating nailing failures due to piston return failure, and improving work efficiency. will improve. In addition, the impact when the piston hits is not only received by the damper but also by the air in the damper cavity and the return storage chamber at the bottom of the damper, so the impact force of the piston transmitted to the main body via the damper is reduced, reducing the vibration of the main body. This improves work efficiency and the life of the nailing machine. Furthermore, since the damper is in contact with the compressed air through the cavity, heat generated by impact energy applied to the damper can be cooled down.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of the nailing machine of the present invention, Figure 2
The figure is an example of the prior art, and is a partially sectional side view showing the overall configuration of an automatic nailing machine, and FIG. 3 is a partially sectional side view showing an example of the use of the automatic nailing machine. In the figure, 1 is a housing, 2 is a piston,
3 is a cylinder, 4 is a striking rod, 7 and 9 are return storage chambers, 8 is an injection port, 10 is an air passage, 11 is a damper, 12 is a plate, 13 is a cavity, and 14 is an opening hole.

Claims (1)

[Claims for Utility Model Registration] A piston that reciprocates within a cylinder using compressed fluid, a damper provided to absorb the impact of the piston when it descends and hits the stop, and a damper for the stop. In order to return the piston with air compressed in the lower part of the piston after impact, an automatic nailing machine is provided with a return storage chamber on the outer periphery of the cylinder for storing the compressed air, and the return storage chamber and the air passage communicate with each other via an air passage. An automatic nailing machine characterized in that a return accumulation chamber is provided at a lower part of a damper, and a cavity is provided in the damper to communicate with the return accumulation chamber at the lower part of the damper.