JPH0563778U - Nail driving depth adjusting device of continuous hammering machine - Google Patents

Abstract

(57) [Summary] [Construction] When the movable cylinder side valve element 12 slides with respect to the housing 1 side valve element 13, the inside of the movable cylinder 2 is adjusted when the movable cylinder 2 is at the bottom dead center position. A switching valve mechanism 11 that is connected to a compressed air supply source and opens to the atmosphere when the movable cylinder 2 moves to the top dead center position is formed, and the position of the valve body 13 on the housing 1 side is set in the operating direction of the striking piston 4. A position adjusting device is provided for adjusting along. [Effect] The switching valve mechanism 11 is set to a neutral state in which air supply and exhaust are shut off, and the movable cylinder 2 is in the neutral position when the striking piston 4 is stopped, so that the position of the valve body 13 on the housing 1 side is striking. Piston 4
If the position of the movable cylinder 2 and the position of the striking piston 4 are variably set by adjusting along the operating direction of, the nail driving depth can be adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nail driving depth adjusting device in a continuous hammering type nailing machine in which a nail is driven into an object by continuously striking a nail with a large number of hammers using an impact mechanism using compressed air.

[0002]

[Prior art and its problems]

 In a general nailer that drives a nail with an impact mechanism using compressed air pressure, the nail driving depth is adjusted by variably adjusting the amount of protrusion from the nail injection port (nose) of the driver connected to the impact piston. ing. This method increases the volume around the tip of the nose, making it impossible to drive nails into a narrow space, and there is the problem that adjustment is performed near the tip of the nose, which is dangerous.

On the other hand, there is known a nailing machine in which a piston slidably housed in a movable cylinder is continuously and repeatedly driven and a driver continuously connected to the piston continuously strikes one nail. .. In this type of continuous hammering machine, a movable cylinder is movably arranged in the housing, and when the striking piston is driven, the movable cylinder moves for reaction so that compressed air is supplied to and discharged from the movable cylinder. By doing so, the batting piston is driven repeatedly. A switching valve mechanism is formed between the outer peripheral surface of the movable cylinder and the housing so that the movable cylinder can be selectively connected to the main chamber and the atmosphere. Along with this, compressed air is introduced into the movable cylinder, and the state in which the compressed air is exhausted is repeated to repeatedly drive the movable cylinder.

In the above switching valve mechanism, a state in which both the air supply and the exhaust are shut off is set between the air supply state and the air exhaust state. This is to prevent the compressed air that has been supplied from the supply air and the exhaust air being released at the same time from being directly exhausted, thereby increasing the air consumption. Then, when the striking piston in the movable cylinder gradually approaches the bottom of the movable cylinder by repeated hits and comes into contact with the bumper arranged at the bottom, it cannot move any further downward. At the same time, no reaction is applied to the movable cylinder due to the driving of the striking piston. Therefore, the operation of the movable cylinder and the operation of the striking piston are automatically stopped. At this time, the tip of the driver is set to slightly protrude from the nail ejection port.

As described above, according to the conventional continuous hammering type nailing machine, the nail is continuously driven until the continuous hammering is completed, so that the nail is sunk by the amount of the driver. For this reason, the operator must stop the continuous hammering on the way and adjust the nail driving depth by experience, and skill is required.

[0006]

[The purpose of the device]

 By the way, looking at the operating state of the striking piston and the movable cylinder until the operation stopped, the striking piston operates with a large stroke at the beginning of driving, but the return movement amount gradually decreases and the operating stroke Becomes smaller gradually. Along with this, the operation amount gradually decreases around the position in the neutral state where the movement of the movable cylinder and the above-mentioned air supply and exhaust are shut off, and finally it stops at the neutral position. At the stop position of the movable cylinder, the striking piston is in contact with the bumper installed on the bottom of the movable cylinder, so that the stop position of the tip of the driver with respect to the housing becomes constant.

The present invention was made in view of the above points, and the nail driving depth can be adjusted by variably setting the stop position of the movable cylinder, and the adjusting operation is safe and easy. Moreover, it is an object of the present invention to provide a driving depth adjusting device for a continuous hammering type nailing machine which does not increase the volume around the nose.

[0008]

[Means for achieving the purpose]

 In order to achieve the above object, a driving depth adjusting device of a continuous hammering type nailing machine according to the present invention includes a striking piston slidably housed at the upper end and having a driver integrally connected therein, and striking at the bottom. A continuous hammering type nailing machine having a bumper for stopping a piston and a movable cylinder slidably arranged in the housing along the nail driving direction and always urged downward. Between the valve body formed on the surface and the valve body formed on the inner wall side of the housing, the valve body on the outer peripheral surface of the movable cylinder slides with respect to the valve body formed on the inner wall side of the housing. At this time, when the movable cylinder is at the bottom dead center position, the inside of the movable cylinder is shut off from the atmosphere and connected to the compressed air supply source, and when the movable cylinder moves to the top dead center position, the inside of the movable cylinder is compressed air. By blocking the sources to form a switching valve mechanism for opening to the atmosphere, characterized in that a positioning device positioned adjusted along the operation direction of the striking piston of the housing side of the valve body.

In the position adjusting device for the valve element on the housing side, an annular adjuster dial having an external operation is rotatably arranged on the housing, and the adjuster dial is circumferentially arranged on an upper surface or a lower surface of the adjuster dial. While forming a plurality of steps with different heights, a protrusion is formed on the housing-side valve body at a position corresponding to the step, and these multiple steps are formed on the protrusion of the housing-side valve body. The position of the valve element on the housing side may be variably set by being selectively engaged.

Further, the valve element on the housing side is provided on the inner peripheral surface of a cylindrical valve that is arranged around the movable cylinder and is slidable in the axial direction, and the valve moves in the movable cylinder at the initial position. It may be arranged so as to be in a position where it is cut off from the compressed air supply source and to move to the position where it is connected to the compressed air supply source in the movable cylinder during operation.

[0011]

[Function and effect of the device]

 According to the above configuration, the compressed piston is supplied into the movable cylinder, so that the striking piston is driven in the nail driving direction to strike the nail. At the same time, the movable cylinder moves upward due to the reaction of the driving of the striking piston. When the movable cylinder moves upward, the inside of the movable cylinder is switched to open to the atmosphere, so that the pressure difference between the upper and lower surfaces of the striking piston reverses and the striking piston moves upward. At this time, since the driving reaction force of the striking piston also disappears, the movable cylinder moves downward again. At the bottom dead center, the switching valve mechanism again switches the inside of the movable cylinder to connect it to the compressed air supply source, so that the striking piston is driven and the movable cylinder also moves upward. The above operation is repeated and the nails are repeatedly hit.

By the way, the switching valve mechanism is set to a neutral state in which air supply and exhaust are shut off, and when the striking piston hits the bumper and stops, the movable cylinder is in the neutral position. If the position of the valve element on the housing side is adjusted along the operating direction of the striking piston by the adjusting device, the position of the movable cylinder and the position of the striking piston can be variably set. Since the driving depth of the nail is determined by the stop position of the striking piston, the driving depth of the nail can be adjusted by the position adjusting device. Therefore, no skill is required for nailing work.

When the position adjusting device for the valve element on the housing side is performed by the adjuster dial, the adjusting operation can be performed safely and easily, and the volume around the nose is not increased.

Further, the valve element on the housing side is disposed on the inner peripheral surface of the valve which is arranged around the movable cylinder and which connects or disconnects the switching valve and the compressed air supply source by sliding in the axial direction thereof. When provided, the nail driving depth can be adjusted by variably setting the sliding end position when the valve is in communication.

[0015]

【Example】

 An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a continuous hammering type nailing machine. Direction (vertical direction in the figure), a movable cylinder 2 is slidably disposed, a movable piston 2 is slidably accommodated in the movable cylinder 2 and a driver piston 3 is integrally connected to the movable cylinder 2, and compressed air is supplied. A main chamber (compressed air storage chamber) A connected to a power source (not shown) is arranged, and the compressed air in the main chamber A is used to move the movable cylinder 2 and the impact cylinder 2 by a switching mechanism described below. Is continuously operated, and the nails 6 in the nose portion 5 continuously provided below the housing 1 are repeatedly hammered.

The upper part of the movable cylinder 2 is closed by a cylinder head 7, and the movable cylinder 2 is formed in a bottomed cylinder shape in which a bumper 8 is arranged at the bottom part. A coil spring 9 is provided between the cylinder head 7 and the upper bottom part of the housing 1. The movable cylinder 2 is attached and is constantly urged downward by the spring force of the coil spring 9. Further, an opening 10 is formed on the upper side wall of the movable cylinder 2, and the switching valve mechanism 11 switches the supply / discharge of compressed air to / from the opening 10.

The switching valve mechanism 11 is composed of a valve body 12 formed on the outer peripheral surface of the movable cylinder 2 and a sleeve-shaped valve body 13 formed on the inner wall side of the housing 1. That is, the valve body 12 of the movable cylinder 2 is formed by the upper and lower sealing members 14 and 15 which are provided around the outer peripheral surface thereof. On the other hand, the inner diameter of the central portion 16 of the inner peripheral surface of the sleeve-shaped valve body 13 is small enough to make sliding contact with the sealing members 14 and 15 of the movable cylinder 2, and the inner diameters of the upper and lower portions 17 and 18 are the above-mentioned sealing member 14, It is formed to be large enough to form a gap with 15. When the movable cylinder 2 is at the bottom dead center position (see FIG. 1), the lower sealing member 15 is disengaged downward from the central portion 15 of the inner peripheral surface of the sleeve-shaped valve body 13 to cause the movable cylinder 2 to move downward. When the movable cylinder 2 is moved to the top dead center side (see the dotted line in FIG. 2) and the inside is shut off from the atmosphere and connected to the main chamber A, the upper sealing member 14 causes the inner circumference of the sleeve-shaped valve body 13 to move. When the movable cylinder 2 is disengaged upward from the center portion 16, the inside of the movable cylinder 2 is cut off from the main chamber A through the opening 10 and opened to the atmosphere through the exhaust hole 18 in the upper part of the housing 1. When the movable cylinder 2 slides, as shown in FIG. 3, the upper and lower sealing members 14 and 15 simultaneously come into contact with the central portion 16 of the inner peripheral surface of the sleeve-shaped valve body 13 to block air supply and exhaust. It is set to be in a neutral state.

Next, an annular upper chamber 21 and a lower chamber 22, which accommodate the main valve 20 slidably in the axial direction, are formed on the outer peripheral side of the sleeve-shaped valve body 13 so as to vertically oppose each other. A valve guide 23 is arranged outside the chamber 21, and an air passage 24 communicating with the trigger valve is formed at the bottom of the lower chamber 22. The main valve 20 is formed in a tubular shape, and an opening 25 is formed through the lower portion of the side wall of the main valve 20. When the main valve 20 is at the lower end position of the lower chamber 22 (see FIG. 1), the main chamber A and the switching valve mechanism 11 are shut off, and when the main valve 20 moves to the upper end position (see FIG. 2). The reference chamber) is configured to communicate between the main chamber A and the switching valve mechanism 11 through the opening 25. Further, a spring 27 for constantly urging the main valve 20 downward is arranged between the projecting edge 26 at the center of the outer peripheral wall of the main valve 20 and the lower surface of the valve guide 23.

The main valve 20 is normally located at a lower position by the spring 27, and a trigger valve (not shown) is actuated based on a pulling operation of the trigger lever 28 so that the main valve 20 is moved from the air passage 24 into the lower chamber 22. The air pressure of the compressed air supplied to the spring causes the spring 27 to move upward as shown in FIG. When the compressed air is exhausted by the release operation of the trigger lever 28, the main valve 20 is again moved downward by the spring 27.

Next, a position adjusting device for adjusting the position of the sleeve-shaped valve body 13 on the housing 1 side is provided along the operating direction of the striking piston 4. This position adjusting device is composed of an adjuster dial 30 and a sleeve-shaped valve body 13. The adjuster dial 30 is formed in an annular shape, and is rotated between the housing body 1a and the housing cap 1b above it. It is arranged as possible. As shown in FIGS. 4 (a) and 4 (b), the adjuster dial 30 is formed with an operation portion 31 exposed to the outside of the housing 1 so as to project outward, and the adjuster dial 30 has a lower surface on the lower surface thereof. Two step portions a and b having different heights are formed in the circumferential direction. Steps of the same height are placed on opposite sides of the center. g is a guide slope. On the other hand, as shown in FIGS. 5 (a) and 5 (b), outwardly projecting projections 33 are formed on the outer peripheral surface of the sleeve-shaped valve body 13 in fan-shaped projections on opposite sides. The circumferential length of the notch 34 between the protrusions 33 is longer than the circumferential length of the higher stepped portion a of the adjuster dial 30, and at both ends of each protrusion 33. Also, a guide slope g is formed. The protrusion 33 is sandwiched between the adjuster dial 30 and the upper end of the valve guide 23 in the upper chamber 21 of the main valve housing 1, whereby the position of the sleeve-shaped valve body 13 in the housing 1 is determined. Therefore, the position of the housing 1 side valve body 12 can be variably set by selectively engaging the step portions a and b of the adjuster dial 30 with the protrusions 33 of the housing 1 side valve body 12. That is, as shown in FIG. 1, if the high step portion a of the adjuster dial 30 is engaged with the upper surface of the protrusion 33 of the housing 1 side valve body 12 by operating the operating portion 31, the sleeve-like valve body 13 Is set to a low position, and if the lower step b is engaged with the upper surface of the protrusion 33 of the valve element 12 on the housing 1 side as shown in FIG. 6, the sleeve-shaped valve element 13 is set to a high position. ..

In the above structure, before starting the nail driver, the main valve 20 is at the lower end position of the lower chamber 22 of the valve housing 1 by the spring force of the spring 27, and the main chamber A and the switching valve mechanism 11 are connected to each other. It is shut off. Similarly, the movable cylinder 2 is also at the bottom dead center position due to the spring force of the coil spring 9. When the nail driver is started, the trigger lever 28 is pulled to operate the trigger valve to supply compressed air from the air passage 24 into the lower chamber 22 of the main valve 20. As a result, the main valve 20 moves upward as shown in FIG. 2, the main chamber A communicates with the switching valve mechanism 11 through the opening 10 of the main valve 20, and the compressed air in the main chamber A moves to the movable cylinder 2. Suddenly supplied from the opening 10. Therefore, the striking piston 4 is driven in the nail driving direction to strike the nail 6 in the nose portion 5. At the same time, the movable cylinder 2 moves upward as shown by the dotted line against the coil spring 9 by the reaction of the driving of the striking piston 4. When the movable cylinder 2 moves upward, the upper sealing member 14 is disengaged upward from the central portion 16 of the inner peripheral surface of the sleeve-shaped valve body 13, so that the movable cylinder 2 is blocked from the main chamber A and communicated with the exhaust hole 18. Since the pressure balance between the upper and lower surfaces of the striking piston 4 is reversed, the striking piston 4 moves upward as shown in FIG. At this time, the driving reaction force of the striking piston 4 also disappears, so that the movable cylinder 2 moves downward again by the spring force of the coil spring 9. When the bottom dead center is reached, the switching valve mechanism 11 again shuts off the inside of the movable cylinder 2 from the atmosphere and switches the connection to the main chamber A, so that the striking piston 4 is driven, and at the same time the movable cylinder 2 is moved. Also moves up. The above operation is repeated, and the nail 6 is repeatedly hit.

The striking piston 4 operates with a large stroke at the beginning of driving, but the returning movement amount gradually decreases as the nail 6 is driven, the operating stroke gradually decreases, and finally, the movable cylinder 2 moves. The bumper 8 installed at the bottom is brought into contact and stopped. The movable cylinder 2 also gradually decreases its operation amount around the neutral position where the supply air and the exhaust air are shut off, and finally stops in the neutral position shown in FIG. 3 in synchronization with the stop of the striking piston 4. ..

By the way, the stop of the striking piston 4 is determined by the stop position (neutral position) of the movable cylinder 2, and the neutral position is determined by the position of the sleeve-shaped valve body 13. Therefore, the adjuster dial 30 of the position adjusting device is set. By selecting the engagement between the stepped portions a and b and the projection 33 of the sleeve-shaped valve body 13 by the rotation operation of, the stopping height position of the striking piston 4 is set to the height position of FIG. Can be set as follows. Since the driving depth of the nail is determined by the stop position of the striking piston 4, the driving depth of the nail can be adjusted by the position adjusting device. Further, the dial adjusting operation can be performed safely and easily, and the volume around the nose portion 5 is not increased.

It is to be noted that a configuration is also possible in which a step portion is formed on the upper surface of the adjust dial 30 and the position of the sleeve-shaped valve element 13 is adjusted by the engagement of this step portion and the lower surface of the protrusion 33 of the sleeve-shaped valve element 13. Of course good things.

Next, FIG. 7 shows an example in which the sleeve-shaped valve element is integrally formed with the main valve to constitute a valve element (sleeve-shaped valve element portion 13a) on the inner peripheral side of the housing. The mechanism 11a is formed between the movable cylinder 2 and the sleeve-shaped valve body portion 13a. That is, upper and lower sealing members 14a and 15a are provided around the outer peripheral surface of the movable cylinder 2, whereas the inner diameter of the central portion 16a of the inner peripheral surface of the sleeve-shaped valve body portion 13a is small and the upper and lower portions 17a, The inner diameter of 18a is formed large. The neutral state is set in the same way as in the example of FIG. The same parts as those shown in FIG. 1 are designated by the same reference numerals.

The main valve 20a is slidably guided in the axial direction by a lower chamber 22a formed in the housing 1 and an annular valve guide 23a vertically slidably arranged above the lower chamber 22a. As shown in FIG. 8, the upward movement of the main valve 20a is always urged downward by the inclined surface 35 of the inner circumference of the valve guide 23a and the inclined surface 36 of the outer circumference of the main valve 20a. Will be regulated. Therefore, the upper end of the main valve 20a is determined by the position of the valve guide 23a.

Next, the position adjustment of the sleeve-shaped valve body portion 13a is configured by the adjuster dial 30a and the valve guide 23a. That is, the adjuster dial 30a has an operating portion 31a as shown in FIGS. 9 (a) and 9 (b), and two step portions a and b having different heights in the circumferential direction are formed on the lower surface. On the other hand, as shown in FIGS. 10 (a) and 10 (b), step portions a, b, and c having different heights are also formed on the upper surface of the valve guide 23a. Therefore, similarly to the above-described example, the height of the valve guide 23a can be increased by selectively engaging the adjuster dial 30a with the step portions a, b, c of the valve guide 23a by rotating the operation portion 31a. The position can be adjusted. Since the upper moving end of the main valve 20a is determined by the position of the valve guide 23a, the upper moving end of the main valve 20a can be variably set by the position adjusting device, and therefore the position of the sleeve-shaped valve body portion 13a can also be adjusted. can do.

Also in the above configuration, the main valve 20a is lifted by pulling the trigger lever and operating the trigger valve to supply compressed air from the air passage 24a into the lower chamber 22a of the main valve 20a as shown in FIG. When moved, the central portion 16a of the inner peripheral surface of the sleeve-shaped valve body 13a is disengaged from the lower sealing member 15a of the movable cylinder 2, and the compressed air in the main chamber A is moved from the opening 10 of the movable cylinder 2 in the movable cylinder 2. Suddenly supplied inside. Therefore, the striking piston 4 is driven in the nail driving direction to strike the nail in the nose portion. At the same time, the movable cylinder 2 moves upward against the coil spring 9 due to the reaction of the driving of the striking piston 4, and the upper sealing member 14a moves upward by disengaging from the central portion 16a of the inner peripheral surface of the sleeve-shaped valve body portion 13a. Since the inside of the cylinder 2 is opened to the atmosphere, the striking piston 4 moves upward and the movable cylinder 2 moves downward. Then, similarly to the above-mentioned example, the switching valve mechanism 11 operates to cause the switching valve to supply or exhaust compressed air to the movable cylinder 2 in response to the vertical movement of the movable cylinder 2, thereby moving the striking piston 4 up and down. The nail is continuously driven by the interaction that the movable cylinder 2 is moved up and down by the driving of the striking piston 4, and the movable cylinder 2 is also stopped at the neutral position when the striking piston 4 is stopped. The main valve 20a is held at the upper position during the continuous striking.

By the way, the stop of the striking piston 4 is determined by the stop position (neutral position) of the movable cylinder 2, and the neutral position is determined by the position of the sleeve-shaped valve body portion 13a. By selecting the height of the position of the valve body portion 13a, the stopping position of the striking piston 4 can be set as shown in FIGS. 7 and 11, and the nail driving depth can be adjusted.

Note that, also in the case of the above configuration, similarly to the case of FIG. 1, a protrusion (not shown) is formed on the outside of the sleeve-shaped valve body portion 13a of the main valve 20, and the protrusion and the adjuster The position may be adjusted by selectively engaging the step portion of the ear 30. As described above, the configuration of the valve side position adjusting device on the housing side is not necessarily limited to the above illustrated example.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a nail driving depth adjusting device of a continuous hammering nailer according to the present invention.

FIG. 2 is an explanatory view of a mode of continuous hammering operation of the nail driving machine.

FIG. 3 is an explanatory diagram of a neutral position of a movable cylinder of the nail driver.

4A and 4B are a plan view and a side view of an adjuster dial, respectively.

5A and 5B are a plan view and a side view of a sleeve-shaped valve body, respectively.

FIG. 6 is an explanatory view of an adjustment mode of the nail driving depth adjusting device.

FIG. 7 is a cross-sectional view of essential parts of another example of the nail driving depth adjusting device.

FIG. 8 is an explanatory view of a continuous hammering operation mode of the nailing machine of FIG.

9A and 9B are a plan view and a side view of an adjuster dial, respectively.

10A and 10B are a plan view and a side view of a valve guide, respectively.

11 is an explanatory view of an adjustment mode of the nail driving depth adjusting device of FIG. 5. FIG.

[Explanation of symbols]

 2 movable cylinder 3 driver 4 striking piston 12 valve element of movable cylinder 13 valve element on housing side (sleeve valve element) 13a sleeve valve element 20 main valve 30 adjuster dial 33 protrusion

Claims (3)

[Scope of utility model registration request] 1. A striking piston having an upper end closed and a driver integrally connected therein is slidably accommodated therein, and a bumper for stopping the striking piston is provided at a bottom portion and slid in the housing along a nail driving direction. In a continuous hammering nailing machine equipped with a freely arranged movable cylinder which is always urged downward, between a valve body formed on the outer peripheral surface of the movable cylinder and a valve body formed on the inner wall side of the housing. When the valve body on the outer peripheral surface of the movable cylinder slides on the valve body formed on the inner wall side of the housing, the inside of the movable cylinder is shut off from the atmosphere when the movable cylinder is at the bottom dead center position. In addition, a switching valve mechanism that is connected to the compressed air supply source and shuts off the inside of the movable cylinder from the compressed air supply source to open to the atmosphere when the movable cylinder moves to the top dead center position is also formed. , The housing side of the valve member position driving depth adjusting device barrage type nailing machine, characterized in that a position adjusting device that adjusts along the operation direction of the striking piston of. 2. A valve body position adjusting device on the housing side rotatably disposes an annular adjuster dial having an external operation on the housing, and has a height in the circumferential direction on an upper surface or a lower surface of the adjuster dial. While forming a plurality of different stepped portions, a protrusion is formed on the housing side valve body at a position corresponding to the stepped portion, and these plurality of stepped portions are selectively engaged with the protruding portion of the housing side valve body. 2. The driving depth adjusting device for a continuous hammering nailing machine according to claim 1, wherein the position of the valve element on the housing side is variably set by combining them. 3. The valve element on the housing side is provided on the inner peripheral surface of a tubular valve that is arranged around a movable cylinder and is slidable in the axial direction. The valve is compressed with the switching valve in the initial position. 2. A position where it is cut off from an air supply source, and is arranged so as to move to a position where it connects the switching valve and the compressed air supply source during operation.
A driving depth adjusting device for the continuous nailing machine described in the above.