JPH06677U - Driving machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a driving unit of a driving machine for driving a fastener such as a nail by using compressed air as a power source, and an object thereof is to accumulate pressure in the driving unit of the driving machine. It is possible to reduce the size and weight of the driving machine while ensuring the volumes of the chamber, the cylinder chamber, and the return chamber. [Structure] A cylinder plate 11 that divides the pressure accumulating chamber 8 and the return chamber 10 is slidable by a predetermined distance, and a spring 13 that presses the cylinder plate 11 toward the pressure accumulating chamber 8 is provided to provide the volumes of the pressure accumulating chamber 8 and the return chamber 10. To be able to share.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a driving machine for driving fasteners such as nails by using compressed air as a power source.

[0002]

[Prior art]

 FIG. 5 shows an example of a conventional driving machine. A conventional driving machine includes a switch 3 which is operated by operating a trigger 2, a head valve 4 which is opened and closed by the switch 3, and a piston 6 which reciprocates in a cylinder 7 to strike a stopper 5. The drive unit consists of three air chambers, a pressure storage chamber 8, a cylinder chamber 9, and a return chamber 10. The pressure storage chamber 8 and the return chamber 10 are divided by a cylinder plate 11, and the cylinder plate 11 is fixed by a stop washer 12. It was

[0003]

[Problems to be solved by the device]

 In the driving machine equipped with the driving unit shown in FIG. 5, three types of pressure accumulating chamber 8, cylinder chamber 9 and return chamber 10 are selected depending on the size of the stopper 5 used and the output required for driving the material to be driven. Since the volumes of the air chambers are determined and it is difficult to reduce the volumes of the three air chambers, it was difficult to reduce the size and weight of the driving machine as a result. An object of the present invention is to solve the above problems and provide a compact and lightweight driving tool.

[0004]

[Means for Solving the Problems]

 The above object can be achieved by providing the cylinder plate so as to be slidable in the vertical direction and installing a spring for constantly pressing the cylinder plate toward the pressure accumulating chamber.

[0005]

[Action]

 In the drive unit configured as described above, the cylinder plate moves to the return chamber side when the piston rises (before striking), and secures a predetermined accumulator chamber volume necessary for striking the stopper. The cylinder plate moves to the pressure accumulator side when the piston descends (after striking), and secures the predetermined return chamber volume necessary for the piston to return.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the figure, a cylindrical cylinder 7 is provided in the driving machine body 1, and a piston 6 is provided in the cylinder 7 so as to be vertically slidable. Further, a piston ring 14 is provided on the outer circumference of the piston 6 to seal between the cylinder 7 and the piston 6. Further, a head valve 4 is provided at the upper end of the cylinder 7, and when the trigger 2 is pulled and the switch 3 enters, the head valve 4 rises, the upper end of the cylinder 7 opens, and the accumulator chamber 8 and the cylinder chamber 9 communicate with each other. The exhaust unit 15 is closed to shut off the air from the cylinder chamber 9. When the trigger 2 is returned and the switch 3 is turned off, the head valve 4 descends, the upper end of the cylinder 7 closes and the exhaust part 15 opens, and the upper part of the piston 6 in the cylinder chamber 9 communicates with the atmosphere.

On the other hand, there is a return chamber 10 around the lower part of the cylinder 7, and the return chamber 10 and the cylinder chamber 9 communicate with each other through a passage 16. Further, the return chamber 10 and the cylinder chamber 9 are transferred from the cylinder chamber 9 to the return chamber 10. The passages 17 allow air to pass in only one direction. A cylinder plate 11 for isolating the pressure accumulating chamber 8 and the return chamber 10 is provided on the outer periphery of the cylinder 7, and the cylinder plate 11 is slidably installed between the passage 17 and the stopper washer 12 as well as the spring. It is constantly pressed to the pressure accumulating chamber 8 side by 13. The cylinder plate 11 connects the main body 1 to a compressed air source such as an air compressor, and when the pressure accumulating chamber 8 is filled with compressed air, the pressure of the pressure accumulating chamber 8 becomes larger than the pressing force of the spring 13, and the cylinder plate 11 becomes the return chamber 10 Move to the side. Further, when the piston 6 descends, the resultant force of the pressure in the return chamber 10 and the pressing force of the spring 13 becomes larger than the pressure in the pressure accumulating chamber 8, and the cylinder plate 11 moves to the pressure accumulating chamber 8 side.

The operation of the above structure will be described. FIG. 2 shows a state in which the main body 1 is not connected to the compressed air source, and the cylinder plate 11 is moved to the pressure accumulating chamber 8 side by the pressing force of the spring 13. Next, as shown in FIG. 3, when the main body 1 is connected to the compressed air source, the pressure filled in the pressure accumulating chamber 8 becomes larger than the pressing force of the spring 13, and the cylinder plate 11 moves to the return chamber 10 side to accumulate the pressure. The chamber 8 has a predetermined volume required to drive the stopper 5.

FIG. 4 shows a state in which the stopper 5 is driven in. When the trigger 2 is pulled, the switch 3 enters and the head valve 4 rises so that the pressure accumulating chamber 8 and the cylinder chamber 9 communicate with each other. The compressed air in the pressure accumulating chamber 8 rapidly flows into the cylinder chamber 9 and the piston 6 descends to strike the stopper 5. On the other hand, the air below the piston 6 in the cylinder chamber 9 flows into the return chamber 10 from the passage 16, and when the piston ring 14 passes through the passage 17, the compressed air flowing into the cylinder chamber 9 returns from the passage 17 to the return chamber. Since the pressure flows into the pressure accumulating chamber 8, the pressure in the return chamber 10 and the resultant force of the spring 13 become larger than the pressure in the accumulating chamber 8, and the cylinder plate 11 moves to the pressure accumulating chamber 8 side and is necessary to return the piston 6 to the return chamber 10. The volume of is secured. Next, when the trigger 2 is returned, the switch 3 is turned off, the head valve 4 is lowered, and the compressed air above the piston 6 in the cylinder 7 is exhausted from the exhaust portion 15. The piston 6 is pushed back by the compressed air in the return chamber 10 passing through the passage 16. Since the pressure in the return chamber 10 is lowered, the pressure in the pressure accumulating chamber 8 becomes larger than the pressing force of the spring 13, and the cylinder plate 11 moves to the return chamber 10 side and becomes the state of FIG.

[0010]

[Effect of device]

 According to the present invention, since the volume in which the cylinder plate moves can be shared by the pressure accumulating chamber and the return chamber, the pressure accumulating chamber and the return chamber can be made smaller by the amount that can be shared, and the driving tool is small and lightweight. Can be converted. Further, when the present invention is adopted with the accumulator chamber and the return chamber being the same size as the conventional one, it is possible to increase the volumetric output that can be shared as compared with the output of the conventional driving machine.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the driving tool of the present invention.

FIG. 2 is a sectional view showing a state in which the driving tool according to the present invention is not connected to a compressed air source.

FIG. 3 is a sectional view showing a state in which the driving tool according to the present invention is connected to a compressed air source.

FIG. 4 is a sectional view of a driving unit showing a driving machine when driving a fastener.

FIG. 5 is a cross-sectional view of a driving machine showing an example of a conventional technique.

[Explanation of symbols]

6 is a piston, 7 is a cylinder, 8 is a pressure accumulating chamber, 9 is a cylinder chamber, 10 is a return chamber, 11 is a cylinder plate, and 13 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A pressure accumulating chamber, which is an air reservoir for driving operation, driven by pressure of compressed air or the like, a cylinder in which a piston for driving operation reciprocates, and an air reservoir for returning the piston after driving. In a driving machine having a return chamber and a cylinder plate that divides the pressure accumulating chamber and the return chamber, the cylinder plate is provided slidably up and down along a cylinder at a constant distance, and the cylinder plate is always on the pressure accumulating chamber side. A driving machine having an elastic body for pressing.