JP6759767B2 - Driving machine - Google Patents

Description

The present invention relates to a driving machine for driving a stopper such as a nail or a pin into a material to be driven such as wood or gypsum board.

The driving machine has a piston housed in a cylinder so as to be reciprocating, and a driver blade integrated with the piston. The piston reciprocates between the top dead center and the bottom dead center in the cylinder, and the driver blade reciprocates as the piston reciprocates. The driving machine further has a supply mechanism for supplying a stopper on the moving path (injection passage) of the driver blade. The supply mechanism supplies a stopper to the injection passage when the driver blade rises to a predetermined position as the piston moves from the bottom dead center side to the top dead center side. After that, when the driver blade descends as the piston moves from the top dead center side to the bottom dead center side, the stopper waiting in the injection passage is hit by the driver blade. The hit stopper is launched from the injection port, which is the exit of the injection passage, and is driven into wood, gypsum board, or the like.

As a means for reciprocating the piston as described above, there is a driving machine that uses air pressure (gas spring). In this type of driving machine, a pressure accumulator chamber (chamber) communicating with the cylinder is provided above the cylinder. When the piston in the cylinder moves from the bottom dead center side to the top dead center side (as it rises), the compressible fluid (usually air) filled in the cylinder and accumulator chamber is compressed, and the internal pressure in the cylinder and accumulator chamber is increased. Increase. After that, the piston that has reached the top dead center moves (descends) from the top dead center side to the bottom dead center side by air pressure. As the piston descends, the driver blade also descends, and the driver blade hits the stopper.

Japanese Unexamined Patent Publication No. 2014-69289

In the above-mentioned driving machine, the cylinder and the accumulator chamber are closed spaces, and when the filled gas, especially air, is used, water vapor may condense due to temperature change, pressure change, etc., and moisture may be generated. is there. That is, dew condensation may occur in the cylinder or in the accumulator chamber. If dew condensation occurs in the cylinder or in the accumulator chamber, there is a possibility that leakage due to corrosion of these inner surfaces, particularly the sealed seal portion, and the sliding resistance of the piston portion may increase.

In order to deal with the above problem, it is conceivable to provide a drain valve in the cylinder or the accumulator chamber. However, when the moisture in the cylinder or the accumulator chamber is discharged through the drain valve, the compressed air filled in the cylinder or the accumulator chamber is also discharged together. Therefore, it becomes necessary to refill the cylinder and the accumulator chamber with compressed air after the drainage work is completed. It is also conceivable to fill with 100% pure nitrogen gas or the like, but in that case, it is necessary to prepare a dedicated facility for performing the filling work.

The present invention is to prevent the occurrence of dew condensation inside the cylinder and accumulator chamber of the driving machine.

The driving machine of the present invention is driven by an electric motor and moves in the cylinder from the bottom dead center side to the top dead center side, while the piston moves in the cylinder from the top dead center side to the bottom dead center side by air pressure. It has a driver blade that moves integrally with the piston, a pressure accumulator chamber that communicates with the cylinder, and a moisture absorbing material provided in the pressure accumulator chamber.

According to the present invention, the occurrence of dew condensation inside the cylinder or accumulator chamber of the driving machine is prevented.

It is sectional drawing of the driving machine. It is sectional drawing along the line AA shown in FIG. It is a partially enlarged sectional view which shows the valve and the accommodating part provided in the accumulator chamber. It is the other partial enlarged sectional view which shows the valve and the accommodating part provided in the accumulator chamber.

(Embodiment 1)
Hereinafter, an example of the embodiment of the present invention will be described in detail with reference to the drawings. In each drawing referred to in the following description, the same or substantially the same members are designated by the same reference numerals.

The driving machine 1 shown in FIG. 1 has a housing 2 including a cylinder case 3 and a handle 4. The cylinder 10 is housed in the cylinder case 3, and the handle 4 extends rearward from the cylinder case 3. A magazine 5 for accommodating the stopper is provided below the handle 4. The handle 4 and the magazine 5 extend substantially parallel to each other from the cylinder case 3, and their respective ends are connected by a connecting portion 6. The housing 2 has two housing halves molded from a synthetic resin such as nylon or polycarbonate, and the housing 2 is assembled by abutting the two housing halves.

The piston 11 is housed in the cylinder 10 so as to be reciprocating. The piston 11 reciprocates inside the cylinder 10 between the top dead center and the bottom dead center along the axial direction of the cylinder 10. In other words, the piston 11 moves from the top dead center side to the bottom dead center side in the cylinder 10, and also moves from the bottom dead center side to the top dead center side. In the cylinder 10, a piston chamber 12 whose volume increases or decreases with the reciprocating movement of the piston 11 is partitioned by the inner peripheral surface of the cylinder 10 and the upper surface of the piston 11.

On the other hand, the driver blade 30 is connected to the lower surface of the piston 11. The driver blade 30 is integrated with the piston 11 and reciprocates together with the piston 11. Specifically, a nose portion 7 is provided at the tip of the cylinder case 3, and an injection passage is provided inside the nose portion 7. The driver blade 30 reciprocates in the injection passage as the piston 11 reciprocates. In the following description, the reciprocating direction of the piston 11 and the driver blade 30 in FIG. 1 is defined as the vertical direction. That is, the vertical direction of the paper surface in FIG. 1 is defined as the vertical direction.

The magazine 5 includes a supply mechanism, and the fasteners housed in the magazine 5 are supplied to the injection passage one by one by the supply mechanism. The driver blade 30 hits the head of the stopper sequentially supplied to the injection passage. The stopper whose head is hit passes through the injection passage, is launched from the injection port which is the exit of the injection passage, and is driven into a material to be driven such as wood or gypsum board.

Here, the piston 11 shown in FIGS. 1 and 2 is located at the top dead center, and the tip 30a of the driver blade 30 is located at the upper limit position. In other words, the upper limit position is the position of the tip 30a of the driver blade 30 when the piston 11 is at top dead center. When the piston 11 shown in FIGS. 1 and 2 moves to the bottom dead center, the driver blade 30 also descends, and the tip 30a of the driver blade 30 moves to the lower limit position. In other words, the lower limit position is the position of the tip 30a of the driver blade 30 when the piston 11 is at bottom dead center. In the following description, the tip 30a of the driver blade 30 may be referred to as a "blade tip 30a".

As shown in FIG. 2, a damper 15 made of an elastic material such as rubber or urethane is provided on the bottom of the cylinder 10. The damper 15 receives the piston 11 that has reached the bottom dead center and avoids a collision between the piston 11 and the cylinder 10. The driver blade 30 extending downward from the piston 11 penetrates the damper 15 and projects from the cylinder 10 through a through hole provided at the bottom of the cylinder 10.

A wheel 50 is provided in the vicinity of the shaft portion of the driver blade 30 protruding from the cylinder 10. In the present embodiment, the wheel 50 is fixed to a drive shaft 51 rotatably supported in only one direction, and a plurality of pins 52 are attached to the wheel 50 at intervals along the circumferential direction thereof. There is. On the other hand, a plurality of racks 32 are provided on the shaft portion of the driver blade 30 along the axial direction thereof.

The housing 2 (FIG. 1) houses an electric motor that is a drive source for the wheel 50. In the present embodiment, the output shaft of the electric motor is a drive shaft 51 of the wheel 50 via a planetary gear type reduction mechanism. It is connected to the. Further, a control board is housed inside the connecting portion 6, and a controller is mounted on the control board. The controller is a microcomputer composed of a CPU, ROM, RAM, and the like. In the present embodiment, the microcomputer controls the electric motor by a PWM (Pulse Width Modulation) method.

As shown in FIG. 2, an accumulator chamber 13 communicating with the piston chamber 12 is provided above the cylinder 10. The piston chamber 12 and the accumulator chamber 13 are pre-filled with a compressible fluid (compressed air in this embodiment). When moving the piston 11 at bottom dead center to top dead center (position shown), the electric motor operates under the control of the controller, and the wheel 50 rotates counterclockwise. When the wheel 50 rotates, the plurality of pins 52 provided on the wheel 50 and the plurality of racks 32 provided on the driver blade 30 are sequentially engaged with each other, the driver blade 30 is gradually pushed up, and the piston 11 is killed downward. Move from the point side to the top dead center side. That is, the driver blade 30 and the piston 11 rise. After that, when the wheel 50 rotates until the pin 52 on the most downstream side in the rotation direction of the wheel 50 and the rack 32 on the lowermost side in the movement direction of the driver blade 30 are engaged, the piston 11 reaches the top dead center. Then, the blade tip 30a reaches the upper limit position.

In the process of moving (rising) the piston 11 as described above, the air in the piston chamber 12 is sent to the accumulator chamber 13 and compressed. After that, when the engagement between the pin 52 and the rack 32 is released, the piston 11 moves from the top dead center side to the bottom dead center side due to the pressure (air pressure) of the compressed air in the piston chamber 12 and the accumulator chamber 13. The driver blade 30 descends.

Here, the nose portion 7 is provided with a push lever (push switch) 7a. While the push lever 7a is held so as to be movable in the vertical direction, it is always urged downward by a coil spring. When the tip of the push lever 7a is pressed against the driven member, the push lever 7a moves upward against the urging of the coil spring. Further, as shown in FIG. 1, the handle 4 is provided with a trigger 4a. When the push lever 7a moves upward against the urging of the coil spring and the trigger 4a is operated, the electric motor starts and the wheel 50 rotates.

The above is the basic operation of the driving machine 1 according to the present embodiment. That is, when the predetermined condition is satisfied, the electric motor operates under the control of the controller to rotate the wheel 50. When the piston 11 is located in the standby position near the bottom dead center, the plurality of pins 52 provided on the wheel 50 and the plurality of racks 32 provided on the driver blade 30 are sequentially engaged with each other, and the driver blade 30 Is pushed up. At the same time, the piston 11 moves from the bottom dead center side to the top dead center side in the cylinder 10. When the piston 11 is located at a standby position other than the vicinity of the bottom dead center (a position between the bottom dead center and the top dead center), the driver blade 30 moves from the standby position toward the top dead center side. It is pushed up and the piston 11 moves. After that, when the piston 11 reaches the top dead center and the engagement between the pin 52 and the rack 32 is released, the piston 11 moves from the top dead center side to the bottom dead center side by air pressure (gas spring). , The driver blade 30 is lowered and the stopper is launched. After that, the above operation is repeated as long as the predetermined condition is satisfied, while the above operation is stopped at the standby position when the predetermined condition is not satisfied. That is, when the driving operation is completed, the blade tip 30a is moved to the standby position to prepare for the next driving operation regardless of whether it is a single shot or a continuous shot. The above operation is stopped.

As shown in FIG. 2, the accumulator chamber 13 is formed by a base member 60 and a head member 70 facing each other. The base member 60 and the head member 70 are made of metal. In order to reduce the weight, the base member 60 and the head member 70 in this embodiment are molded of cast aluminum or the like. Further, the head member 70 is covered with a head cover 14 formed of a synthetic resin such as nylon or polycarbonate.

A fitting groove is formed in the base member 60 over the entire circumference thereof, and the edge of the head member 70 is fitted in the fitting groove. Further, an O-ring as a seal member is interposed in the fitting portion between the base member 60 and the head member 70. Further, the base member 60 is provided with an opening 61, and the upper portion of the cylinder 10 is inserted into the opening 61. That is, the base member 60 forms the accumulator chamber 13 and holds the upper portion of the cylinder 10.

As shown in FIG. 3, a valve 80 is attached to the base member 60. The valve 80 penetrates the base member 60 and extends into and out of the accumulator chamber 13 to control the filling of the compressed air into the accumulator chamber 13 and the discharge of the compressed air from the accumulator chamber 13. The valve 80 is a substantially tubular metal valve (clamp-in valve), one end of which protrudes inside the base member 60 (inside the accumulator chamber 13) and the other end of the outside of the base member 60 (outside the accumulator chamber 13). It protrudes into. In the following description, one end side of the valve 80 protruding into the accumulator chamber 13 is referred to as an “inner protrusion 81”, and the other end side of the valve 80 projecting outside the accumulator chamber 13 is referred to as an “outer protrusion 82”. May be called.

A flow path 83 is provided inside the valve 80. One end of the flow path 83 is opened at the end surface 81a of the inner protrusion 81, and the other end of the flow path 83 is open at the end surface 82a of the outer protrusion 82. That is, the flow path 83 communicates with the inside and outside of the accumulator chamber 13. Further, although not shown, a valve core is provided inside the valve 80. When the valve core is pushed inward toward the accumulator chamber 13, the flow path 83 is opened, while when the valve core is released, the flow path 83 is closed. That is, when the valve core is pushed in, the accumulator chamber 13 communicates with the atmosphere, while when the valve core is released, the accumulator chamber 13 is sealed.

For example, when an air compressor or the like is connected to the valve 80 to supply compressed air, the valve core is pushed by the pressure of the compressed air and the flow path 83 is opened. Then, the compressed air supplied from the compressed air supply source such as an air compressor is filled in the accumulator chamber 13 via the flow path 83. Normally, the valve 80 and the compressed air supply source are connected via a pressure resistant hose. Specifically, one end of the pressure resistant hose is connected to the compressed air supply source, and the other end is connected to the outer protrusion 82 of the valve 80. In this case, the outer protrusion 82 of the valve 80 functions as a nipple to which the joint provided at the end of the pressure resistant hose is connected. Further, by pushing the valve core with the tip of a fingertip or a screwdriver, the compressed air filled in the accumulator chamber 13 can be discharged through the valve 80 (flow path 83).

In the accumulator chamber 13, a housing portion 90 surrounding the inner protrusion 81 of the valve 80 is provided. The accommodating portion 90 is integrally molded with the base member 60. The side wall 91 and the ceiling 92 of the accommodating portion 90 are provided with a plurality of vents 94 communicating with each other inside and outside the accommodating portion 90. In other words, the internal space of the accommodating portion 90 and the accumulator chamber 13 communicate with each other via a plurality of vents 94.

The accommodating portion 90 accommodates a hygroscopic material pack 95 in which the hygroscopic material is enclosed in a perforated bag having breathability. The hygroscopic material in this embodiment is silica gel molded into granules. The bag in which the hygroscopic material is sealed is made of porous paper or resin. The hygroscopic material pack 95 is arranged in the gap between the end surface 81a of the inner protrusion 81 of the valve 80 and the ceiling 92 of the accommodating portion 90, and is the flow path 83 opened in the end surface 81a of the inner protrusion 81. It covers one end. Therefore, the compressed air flowing out from the flow path 83 passes through the hygroscopic material pack 95 and is filled in the accumulator chamber 13. That is, the hygroscopic material is arranged on the path of the compressed air filled in the accumulator chamber 13 via the valve 80. Therefore, since the dry compressed air from which the moisture has been removed by the hygroscopic material is filled in the accumulator chamber 13, the occurrence of dew condensation in the accumulator chamber 13 and the cylinder 10 is prevented.

Further, the internal space of the accommodating portion 90 and the accumulator chamber 13 are communicated with each other through a plurality of vents 94. Therefore, as shown in FIG. 4, the moisture contained in the compressed air filled in the accumulator chamber 13 is constantly absorbed by the hygroscopic material. Therefore, the inside of the accumulator chamber 13 and the inside of the cylinder 10 are kept dry, and the occurrence of dew condensation in the accumulator chamber 13 and the cylinder 10 is prevented.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist thereof. For example, the moisture absorbing material is not limited to silica gel, and a moisture absorbing material made of a porous carbon material such as a porous ceramic material or activated carbon, diatomaceous earth, a polymer adsorbent, or the like can also be used.

However, as the hygroscopic material, it is preferable to select a hygroscopic material that exhibits hygroscopic performance even at a low temperature. Further, it is preferable to select a hygroscopic material that releases moisture by heating or drying and restores the hygroscopic performance, and more preferably, in a normal working temperature range (for example, 0 ° C to 30 ° C) in which a driving machine is used. It is preferable to use a hygroscopic agent having high hygroscopicity and a large amount of moisture released in a temperature range (for example, 60 ° C. or higher) sufficiently higher than the working temperature range.

The packaging material for packaging the hygroscopic material is not limited to the paper bag. For example, a hygroscopic material pack in which the hygroscopic material is housed in a breathable container can also be used. However, an unwrapped hygroscopic material can be arranged inside the accumulator chamber 13 or the accommodating portion 90. In this case, it is preferable to take care so that the valve 80 is not clogged by the hygroscopic material. For example, a filter is provided at the mouth of the flow path 83, or the hygroscopic agent itself is formed in a tablet or block shape to accumulate pressure. It is preferable to have a structure that can be directly fixed to the chamber 13.

The accommodating portion 90 may be integrally molded with the head member 70. Further, a storage portion separate from the base member 60 and the head member 70 may be provided in the accumulator chamber 13.

Further, the structure and shape of the valve 80 are not limited to the above structure and shape. Further, the method of filling and discharging the compressed air described in the present specification is an example, and the accumulator chamber 13 is filled with the compressed air by using another method or an instrument (adapter or the like), or the compressed air is filled from the accumulator chamber 13. Can also be discharged.

Further, the accommodating portion 90 in which the hygroscopic material pack 95 is accommodating can be omitted. In this case, it is preferable to fix the hygroscopic material pack 95 so that it does not move in the accumulator chamber, such as by providing a fixing claw or a fixing portion in the accumulator chamber 13.

1 Driving machine 2 Housing 3 Cylinder case 4 Handle 4a Trigger 5 Magazine 6 Connecting part 7 Nose part 7a Push lever (push switch)
10 Cylinder 11 Piston 12 Piston chamber 13 Accumulation chamber 14 Head cover 15 Damper 30 Driver blade 30a Tip (blade tip)
32 Rack 50 Wheel 51 Drive shaft 52 Pin 60 Base member 61 Opening 70 Head member 80 Valve 81 Inner protrusion 81a, 82a End face 82 Outer protrusion 83 Flow path 90 Storage 91 Side wall 92 Ceiling 94 Vent 95 Hygroscopic material pack

Claims (6)

A housing that holds the cylinder and has a handle,
A piston that is driven by an electric motor and moves in the cylinder from the bottom dead center side to the top dead center side, while a piston that moves in the cylinder from the top dead center side to the bottom dead center side by air pressure.
A driver blade that moves integrally with the piston,
A pressure accumulator that communicates with the cylinder,
The hygroscopic material provided in the accumulator chamber and
It has a breathable and accommodating member for accommodating the hygroscopic material inside .
Driving machine. A housing that holds the cylinder and has a handle,
A piston that is driven by an electric motor and moves in the cylinder from the bottom dead center side to the top dead center side, while a piston that moves in the cylinder from the top dead center side to the bottom dead center side by air pressure.
A driver blade that moves integrally with the piston,
A pressure accumulator that communicates with the cylinder,
The hygroscopic material provided in the accumulator chamber and
It has a fixing portion for fixing the hygroscopic material in the accumulator chamber .
Driving machine. A piston that is driven by an electric motor and moves in the cylinder from the bottom dead center side to the top dead center side, while a piston that moves in the cylinder from the top dead center side to the bottom dead center side by air pressure.
A driver blade that moves integrally with the piston,
A pressure accumulator that communicates with the cylinder,
The hygroscopic material provided in the accumulator chamber and
A valve that controls the filling of the compressible fluid into the accumulator chamber and the discharge of the compressible fluid from the accumulator chamber.
Provided in the accumulation chamber, anda housing part surrounding the valve,
The hygroscopic material is housed in the housing and is arranged on the path of the compressible fluid filled in the accumulator chamber via the valve .
Driving machine. The pressure accumulator chamber is formed by a base member and a head member facing each other.
The accommodating portion is molded into the base member.
The driving machine according to claim 3. The accommodating portion is provided with a plurality of vents that communicate with each other inside and outside.
The driving machine according to claim 3 or 4. The hygroscopic material is silica gel.
The driving machine according to any one of claims 1 to 5.

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