JP3832303B2 - Driving machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driving machine, and is intended to share a piston bumper.
[0002]
[Prior art]
Generally in the driving machine as shown in FIG. 1, the piston 3 is provided for receiving a screwdriver blade 2 and compressed air force for driving the end stop to be nailed, such as wood, the driver blade 2 and the piston 3 Is provided with a return chamber 4 that stores air for returning the bottom dead center to the top dead center. The driver blade 2 and the piston 3 are coupled together and reciprocate in the cylinder portion 5. The cylinder portion 5 includes an air passage 6 that communicates with the return chamber 4. A piston bumper 7 is disposed below the cylinder portion 5 in order to receive the lower surface of the piston 3 that is driven when the stopper is hit. Driving machine 1, after hitting the stop, it is necessary to return to the top dead center driver blade 2 and the piston 3 as described above from the bottom dead center, the compressed air is reserved in the Ri chamber 4 back, The piston 3 is returned to the top dead center by pressing the lower surface of the piston 3 through the air passage 6 provided in the cylinder portion 5. However, the shape of the driver blade 2 differs depending on the type of the fastener as shown in FIGS. 2 and 4, and as shown in FIG. 7, the gap between the driver blade 2 and the nose portion 8 injection port is fitted. 9 is configured, and when the driver blade 2 and the piston 3 start to return to the top dead center, the return chamber 4, the air passage 6 provided in the cylinder portion 5, the cylinder portion 5 via the gap 9 And the pressure accumulation chamber formed by the lower surface of the piston 3 and the upper surface of the nose portion 8 for returning the driver blade 2 and the piston 3 to the top dead center communicates with the atmosphere, and as a result, pressure loss occurs, The driver blade 2 and the piston 3 may not return to the top dead center. In order to prevent the above phenomenon, as shown in FIG. 8, a bumper sheet 10 in which a window having substantially the same shape as the cross-sectional shape of the driver blade 2 is formed in the lower portion of the piston bumper 7 is press-fitted and fitted to the driver blade 2. It has been considered that the pressure loss is prevented by reducing the area of the gap 9 and the driver blade 2 and the piston 3 are surely returned to the top dead center.
[0003]
[Problems to be solved by the invention]
However, the shape of the bumper seat 10 is dependent on the shape of the driver blade 2, the kinds of the driver blade 2 is also a lot Tsu kinds of bumper seat 10 much becomes minute Ru current der. Therefore, the cause is increasing bumper piston bumper 7 the sheet 10 is press-fitted the kinds, they, Ri Contact different outer diameter and thickness, the cause of high cost, are preventing component sharing.
[0004]
An object of the present invention is to provide a driving machine that eliminates the above-mentioned drawbacks of the prior art, enables the piston bumper to be shared, and enables an inexpensive configuration.
[0005]
[Means for Solving the Problems]
The above-described object is achieved by forming a step according to an existing bumper seat and providing a step having a shape capable of press-fitting at least two types of bumper seats under the piston bumper.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a driver blade 2, a piston 3, a cylinder portion 5, and a nose 8 are disposed in the driving machine 1, and a piston bumper 7 into which a bumper seat 10 is press-fitted is disposed at the lower portion of the cylinder portion 5. Has been. The nose portion 8 is configured to be fed with a stopper by a feeding mechanism. The driver blade 2 and the piston 3 are driven by compressed air and hit the stopper in the nose 8, and the lower surface of the piston 3 is received by the upper surface of the piston bumper 7, and the impact when hitting the stopper is It is absorbed by the piston bumper 7. The piston bumper 7 has the shape shown in FIGS. 12 and 13 and is made of an elastic body such as rubber. At the bottom of the piston bumper 7, at least two steps 7A and 7B having different shapes and heights are formed. Has been. The bumper seat 10 </ b> B has a radial tightening allowance by being press-fitted into a step 7 </ b> B at the lower part of the piston bumper 7, and is restrained from moving in the axial direction by pressing down on the lower surface of the piston bumper 7 and the upper surface of the nose 8. The bumper sheet 10 is formed with a window 10 h having the same cross-sectional shape as that of the driver blade 2 so that the driver blade 2 can be fitted. FIGS. 14 and 15 are examples of bumper seats 10B and 10A corresponding to the driver blades 2B and 2A shown in FIGS. 2 and 4, respectively. The piston bumper 7 has a step 7A that matches when the bumper seat 10 is press-fitted. 7B, the shape and height of the step at the bottom of the piston bumper 7 may be any shape, and the cross-sectional shape is not necessarily round.
[0007]
【The invention's effect】
As described above, according to the present invention, since the step of the piston bumper is shaped so that a plurality of existing bumper seats can be press-fitted, the piston bumper can be shared. Therefore, the number of types of piston bumpers can be shared and an inexpensive driving machine can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view of an essential part showing an embodiment of a driving machine of the present invention.
Figure 2 is a side view showing an example of drivers blade.
3 is a cross-sectional view taken along line AA in FIG.
[4] fragmentary sectional side view showing another example of drivers blade.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a cross-sectional front view of an essential part of a driving machine for explaining a conventional technique.
7 is a view as seen from the arrow of FIG.
FIG. 8 is a cross-sectional front view of an essential part showing an example of a conventional driving machine.
FIG. 9 is a view as seen from the arrow in FIG.
10 shows a cross-sectional front view of a main part of a driving machine including the driver blade 2B of FIG. 2 according to an embodiment of the present invention.
11 shows an embodiment of the present invention and is a cross-sectional front view of an essential part of a driving machine equipped with the driver blade 2A of FIG.
FIG. 12 is a cross-sectional view showing an embodiment of a piston bumper.
13 is a bottom view of FIG. 12. FIG.
14 is a top view of a bumper sheet 10B corresponding to the driver blade 2B of FIG.
15 is a top view of a bumper sheet 10A corresponding to the driver blade 2A of FIG.
[Explanation of symbols]
1 is a driving machine, 2 is a driver blade, 7 is a piston bumper, 8 is a nose, and 10 is a bumper seat.

Claims (1)

A magazine for storing the stopper, a nose portion for driving the stopper, a driver blade for striking the stopper, a piston integrated with the driver blade, a cylinder portion for slidably supporting the piston, and a lower portion of the cylinder portion A driving machine composed of a provided piston bumper and a bumper seat embedded under the piston bumper,
At least two bumper sheet embedding steps with different shapes and heights are formed in the lower part of the piston bumper, and a bumper sheet having a window shape that matches the cross-sectional shape of the driver blade is selectively press-fitted into any step. And a bumper seat .

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