JP2009166221A - Combustion type nailing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion type nailing machine preventing clogging of a dust filter and having improved convenience. <P>SOLUTION: The combustion type nailing machine where a fan 19 provided in a combustion chamber 26 is rotated by a motor 18, a piston 23 is driven by combustion gas and air after stirring in the combustion chamber 26 to drive the piston 23, and a nail is driven in by a driver blade integrally formed with the piston, includes a dust filter cleaning means that generates air stream reverse to air stream guided in the combustion chamber. The dust filter cleaning means works by reversely rotating the fan 19 or providing an additional blower means other than the fan to generate the air stream opposite to the normal in the particulate filter 16 provided at an air suction port 3a for guiding outside air to the combustion chamber for cleaning, thus effectively preventing clogging of the dust filter 16 by this cleaning operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a combustion type nailing machine for generating power for driving a piston by igniting a mixture of flammable gas and air, and driving a stopper such as a nail or a hook into a workpiece. In particular, the present invention relates to a combustion nailing machine that can reduce clogging of a dust filter for air to be sucked.

  As a combustion nailing machine (hereinafter simply referred to as “nailing machine”), a mixed gas of combustible gas and air is introduced into the combustion chamber and burned, and the volume expansion of the mixed gas is connected to the piston. It is known to convert to the power of. In the conventional nailing machine, for example, as disclosed in Patent Document 1, a fan is provided in the combustion chamber in order to improve the combustion performance of the mixed gas, and the fuel and air are agitated by this fan. The fan is rotated by a motor, and air is introduced by the fan and turbulence is generated in the combustion chamber to promote combustion. As a result, explosive combustion occurs in the combustion chamber, and the nail is driven into the material to be driven by the piston that converts the volume expansion into power. After combustion, the fan rotates in order to exhaust the exhaust gas from the inside of the cylinder to the outside of the main body, new air is introduced from the upper part of the main body, and the exhaust gas is discharged from the exhaust port provided at the lower part of the main body. I do.

This type of nailing machine is often used in places where there is a lot of dust, such as outdoor construction, and a dust filter is installed at the outside air intake to prevent dust from entering when air is introduced into the combustion chamber. The
JP 2005-329533 A

  A dust filter provided in a conventional nailing machine is a stainless mesh, a thick sponge, or the like, and removes dust by their filtering function. However, dust gradually accumulates depending on environmental conditions and time. As a result, the dust filter is clogged, and there is a possibility that sufficient scavenging cannot be performed and combustion does not occur. For this reason, the worker has to periodically disassemble the main body and clean the dust filter.

  On the other hand, in order to prevent clogging of the dust filter, it is also conceivable to make the eyes of the above-described stainless mesh or sponge rough. In that case, however, fine dust enters the combustion chamber. Nailers are often used in dusty environments, and in particular, concrete powder, gypsum board powder, wood powder, etc. are fine enough to float in the atmosphere for a while. When these fine dusts enter the combustion chamber, they adhere to the plug and the seal portion for forming the combustion chamber, causing a malfunction. Accordingly, the filtration performance of the dust filter which is the main entrance of the dust is improved, and the convenience can be greatly improved by easily cleaning the dust filter itself.

  An object of the present invention is to provide a combustion nailing machine that facilitates cleaning of a dust filter.

  Another object of the present invention is to provide a combustion nailing machine having filter cleaning means for cleaning a dust filter.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to the features of the present invention, an air inlet for introducing outside air into the combustion chamber is provided, a dust filter is provided in the air intake, a fan is provided in the combustion chamber, and the fan is rotated by a motor. In a combustion nailing machine that guides outside air into a combustion chamber through a dust filter, dust filter cleaning means is provided for generating an air flow in a direction opposite to the air flow guided into the combustion chamber.

  The dust filter cleaning means can be realized by reverse rotation means for reversely rotating an existing fan. In this case, for example, a forward / reverse switching circuit for inverting the polarity of electricity applied to the motor is provided. In addition, a fan other than the existing fan may be provided in or near the intake air flow passage of the combustion nailer. Furthermore, it may be a device that generates an air flow in a direction opposite to the intake air flow of the combustion nailing machine, or a means for cleaning the dust filter by other mechanical operations.

  When the fan is rotated in the reverse direction, it is desirable to rotate at a higher rotation speed than when rotating in the forward direction. Further, if a switch for starting cleaning of the dust filter is provided separately from the trigger switch for nail driving operation, the operator can clean at any timing according to the degree of dirt on the dust filter. Even without a switch to start cleaning the dust filter, it automatically detects that a nail driving operation, gas cartridge replacement operation, battery replacement operation, nail refilling operation, etc. have been performed. You may comprise so that it may be performed. For example, the dust filter can be cleaned by driving for a predetermined time after the nail driving operation. In this case, it is desirable that the combustion gas scavenging be performed after a predetermined time has elapsed.

  According to the first aspect of the present invention, in the combustion nailing machine, the dust filter cleaning means for generating the air flow in the opposite direction to the air flow guided into the combustion chamber is provided, so that the dust adhering to the dust filter is removed. It can be efficiently removed (cleaned).

  According to the invention described in claim 2, since the dust filter cleaning means is realized by the reverse rotation means for reversely rotating the existing stirring fan, it is necessary to newly install a new mechanical part in the combustion type nailer. In addition, the cleaning operation can be easily realized by changing the control device a little. Therefore, the cost increase is slight without changing the body size.

  According to the third aspect of the present invention, since the reverse rotation of the fan is rotated at a higher rotational speed than when rotating in the forward direction, the dust filter cleaning effect can be enhanced.

  According to the invention described in claim 4, since the switch for driving the dust filter cleaning means is provided, the operator can perform cleaning at an arbitrary timing, and cleaning can be performed when not in use or between work. This improves convenience.

  According to the fifth aspect of the present invention, since the switch for driving the dust filter cleaning means is provided separately from the trigger switch for the nail driving operation of the combustion type nail driver, it is ensured that the operator does not make a mistake. A cleaning operation can be started.

  According to the invention described in claim 6, since the dust filter cleaning means is driven for a predetermined time after the nail driving operation, the cleaning operation can be automatically performed, and the dust filter can always be kept clean.

  According to the seventh aspect of the present invention, since the reverse rotation means has a forward / reverse switching circuit that reverses the polarity of electricity applied to the motor, the fan can be easily reverse rotated using an existing motor. it can.

  According to the eighth aspect of the present invention, the dust filter cleaning means is a device that generates an air flow in the reverse direction attached to the combustion nailing machine. The filter can be cleaned with an airflow generator.

  According to the ninth aspect of the present invention, in the combustion type nailer, the air flow guided into the combustion chamber is generated by rotating the existing fan in the reverse direction to generate the reverse air flow. Adhering dust can be efficiently removed.

  According to the invention described in claim 10, since the reverse rotation of the existing fan is controlled by the control circuit, the cleaning operation can be controlled by the same control device.

  According to the eleventh aspect of the present invention, since the reverse rotation of the fan is rotated at a higher rotational speed than when rotating in the forward direction, the cleaning effect of the dust filter can be enhanced.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, parts having the same function are denoted by the same reference numerals, and repeated description is omitted. Further, the nail driving direction (the downward direction in FIG. 4) is the lower side, and the opposite direction is the upper side.

  1 and 2 are partial sectional views of a nail driver showing an embodiment of the present invention. FIG. 1 shows the direction of air flow during a cleaning operation, and FIG. 2 shows the air flow during normal nail driving operation. Show direction. 3 is a cross-sectional view showing the entire nailing machine, FIG. 4 is a front view showing the appearance of the main body of the nailing machine, and FIG. 5 is another side view seen from the left direction of FIG. 6 is a top view as seen from above in FIG. 4, and is a partial view excluding the handle portion. 7 is a view seen from above when the head cover 3 and the head protector 44 are removed in FIG. 6, and is a partial view excluding the handle portion as in FIG. FIG. 7 shows a state where no gas cylinder is attached to the cylinder chamber 17.

  As shown in FIG. 3, a head cover 3 having an air inlet 3a is attached to the upper part of the housing 2 constituting the outer frame. A handle 4 extends from the side of the housing 2. The handle 4 is provided with a trigger switch 5, and a battery 4 a is detachably attached near the tip of the handle 4. The battery 4a is a secondary battery such as a nickel metal hydride battery or a lithium ion battery, for example. By attaching the battery 4a, electricity is supplied to the nail driver 1, and when the battery 4a is removed, the supply of electricity is cut off. A cylinder chamber 17 is formed on the other end side of the handle 4, and a gas cylinder 30 containing a combustible liquefied gas serving as a combustion fuel is detachably accommodated in the cylinder chamber 17. A magazine 6 for loading a connection nail (not shown) is disposed below the handle 4.

  From the vicinity of the lower end of the housing 2, a nose 7 is integrally formed with the cylinder 20, and a tip portion of the nose 7 is opposed to the workpiece 28. The nose 7 guides the sliding of the driver blade 23a and a nail (not shown) to be driven into the driven material 28. At the lower end 7a of the nose 7, a push lever 9 that abuts on the workpiece 28 is protruded and supported so as to be vertically slidable, and is fixed to the combustion chamber frame 10 by bolts 50 at the upper end portion of the push lever 9. It is connected with the arm part 8 (FIG. 5). A spring 22 that is an urging member is interposed between the arm portion 8 and the cylinder 20. During normal times (standby), the push lever 9 connected to the arm portion 8 is urged downward.

  A cylinder head 11 covering the upper end opening is fixed to the upper end of the housing 2. As shown in FIG. 3, the motor 18 is located above the combustion chamber 26 of the cylinder head 11, and a spark plug 12 is provided in the vicinity of the motor 18 as shown in FIG. It arrange | positions so that the combustion chamber 26 may be faced.

  The motor holding cylinder 13 is formed in a hollow cylindrical shape, and the motor 18 is held by the motor holding cylinder 13. In the housing 2, a switch 33 is provided for detecting whether the combustion chamber frame 10 has reached the upper end of the stroke when the nailing machine 1 is pressed against the workpiece 28. When the push lever 9 is raised to a predetermined position, the switch 33 is turned on and the rotation of the motor 18 is started. The direction of rotation is a direction that creates an air flow in the direction shown in FIG. 2 (this is referred to as a “forward rotation” direction). At the time of scavenging shown in FIG. 2, as indicated by the first flow path 41, the fan 19 rotates in the forward rotation direction so that air from outside the main body passes through the filter 16 and is guided to the combustion chamber 26. Fine dust is filtered by the filter 16. The exhaust gas generated by the combustion is completely discharged out of the main body in the flow indicated by the second flow path 42.

  A fuel passage 25 is formed on the handle 4 side of the cylinder head 11, one end of the fuel passage 25 opens at the lower end surface of the cylinder head 11, and the other end side is connected to a gas cylinder connection portion 25 a connected to the gas cylinder 30. . A combustion chamber frame 10 that is movable in the longitudinal direction of the housing 2 and whose upper end can contact the lower end surface of the cylinder head 11 is provided in the housing 2. The combustion chamber frame 10 is composed of two members, a chamber 10a and a chamber head 10b, and is joined by a bolt or the like (not shown). The combustion chamber frame 10 is connected to the arm portion 8 (FIG. 4), and the combustion chamber frame 10 moves in conjunction with the movement of the push lever 9. This movement moves up and down by a predetermined amount between the housing 2 positioned on the outer peripheral side of the combustion chamber frame 10 and the cylinder 20 positioned on the inner peripheral side. The cylinder 20 is fixed to the housing 2 and abuts against the inner peripheral surface of the combustion chamber frame 10 to guide the movement of the combustion chamber frame 10. An exhaust port 21 is formed in the vicinity of the central portion of the cylinder 20 in the axial direction, and a check valve (not shown) is provided in the exhaust port 21 so that the exhaust gas flows in one direction.

  A piston 23 that can reciprocate in the vertical direction with respect to the cylinder 20 is provided in the cylinder 20. The driver blade 23a extends from the lower surface of the piston 23 to the nose 7 position, and the tip of the driver blade 23a hits a nail (not shown). A bumper 24 made of an elastic body such as rubber is disposed on the lower surface in the cylinder 20. Therefore, when the piston 23 moves downward, it collides with the bumper 24 at the bottom dead center.

  As shown in detail in FIG. 2, when the upper end of the combustion chamber frame 10 is separated from the cylinder head 11, a first flow path communicating with the outside air between the cylinder head 11 and the upper end of the combustion chamber frame 10. 41 is generated, and the second flow path 42 following the first flow path is opened between the inner peripheral side of the combustion chamber frame 10 and the outer peripheral side of the cylinder 20. These passages allow combustion gas and fresh air to pass through the outer peripheral surface of the cylinder 20, and the passed combustion gas and the like are discharged from the discharge port 2 a (FIG. 3) of the housing 2. The intake port 3 a is formed to supply fresh air into the combustion chamber 26, and the combustion gas in the combustion chamber 26 is discharged from the exhaust port 21. When the upper end of the combustion chamber frame 10 contacts the cylinder head 11, the combustion chamber 26 is defined by the cylinder head 11, the combustion chamber frame 10, and the upper surface of the piston 23.

  The fan 19 is attached below the output shaft of the motor 18 and is disposed in the combustion chamber 26. When the combustion chamber frame 10 before ignition is in contact with the cylinder head 11 by the rotation of the fan 19, the air and the combustible gas are agitated and mixed, and after ignition, turbulent flow is generated and combustion is performed. When the combustion chamber frame 10 is separated from the cylinder head 11 to generate the first flow path and the second flow path, the combustion gas in the combustion chamber 26 is scavenged and the cylinder 20 is cooled.

  Next, forward / reverse switching control for reversing the rotation of the fan 19 will be described with reference to the circuit diagram of FIG. The control unit 61 is a part that controls the electrical operation of the entire nail driver 1, and receives the state signal (ON / OFF) of the push lever 9 and the state signal (ON / OFF) of the trigger switch 5, and the state Accordingly, the motor 18 is rotated forward or reverse. The control unit 61 may be realized by an electronic circuit, or may be controlled by a program by mounting a microprocessor. A circuit board (not shown) including the control unit 61 can be disposed in the handle 4 of the nailing machine 1, for example. The switch 64 is operated by the control line 65 from the control unit 61 to turn on / off the rotation of the motor. The rotation direction of the motor 18 is controlled by switching a switch included in the forward / reverse switching circuit 62 operated by a control line 63 from the control unit 61. The voltage applied to the motor 18 from the battery 4a is set by setting the resistance value of the resistor 66 for the forward rotation and the resistance value of the resistor 67 for the reverse rotation, thereby determining the rotation speed.

  Next, the nailing operation of the present embodiment will be described using the flowchart of FIG. The nailer 1 described here is ready for operation when the battery 4a is attached (Start), and the processing of steps 101 to 103 is started. Steps 101 to 103 are controlled by the control unit 61.

  First, it is checked whether or not the gas cylinder 30 has been replaced (step 101). If the gas cylinder 30 has been replaced, the fan 19 is reversely rotated at a high speed for a predetermined time (step 104). FIG. 1 is a partially enlarged sectional view showing this state. Air outside the main body is guided into the combustion chamber from the lower side of the main body as shown by the second reverse flow path 42a, and passes through the filter from the lower side to the upper side as shown by the first reverse flow path. Therefore, the dust accumulated on the upper surface of the filter 16 during the scavenging is separated from the filter and cleaned by the air flowing in the first reverse flow path 41a. The time for this cleaning may be set as appropriate according to the size of the filter, the fineness of the eyes, the material to be driven, etc., for example, 5 to 10 seconds. Further, the rotational speed of the fan 19 during the cleaning operation is preferably set to be higher than that during normal forward rotation in order to improve the effect. Thus, by rotating the fan reversely at high speed, it is possible to ensure ignition performance and improve the cleaning effect.

  If the gas cylinder has not been replaced in step 101, it is next checked whether or not the battery 4a has been replaced (step 102). If it is determined that the battery has been replaced, the process proceeds to step 104 where a cleaning operation is performed.

  If the battery has not been replaced in step 102, it is next checked whether the magazine 6 is filled with nails (step 103). If it is determined that it has been filled, the routine proceeds to step 104 where a cleaning operation is performed.

  If it is determined in step 103 that the nail is not filled, or if the cleaning operation is completed in step 104, the process proceeds to step 105.

  In step 105, as a nail driving preparation operation, it is determined whether or not the nail driver 1 is pressed against the material to be driven by the operator, that is, whether or not the push lever 9 is pressed. Here, a state where the push lever 9 is pressed is referred to as “push lever ON”, and a state where the push lever 9 is not pressed is referred to as “push lever OFF”. When the push lever is OFF, the nail driver 1 is in a standby state, and step 105 is repeated. In the standby state, the push lever 9 is urged downward by the urging force of the spring 22 and protrudes from the lower end of the nose 7. At this time, since the combustion chamber frame 10 is connected to the push lever 9 via the arm portion 8, the upper end of the combustion chamber frame 10 is separated from the cylinder head 11, and the combustion chamber 26 of the combustion chamber frame 10 is defined. The first channel 41 and the second channel 42 are opened apart from the formed portion and the upper end of the cylinder 20. At this time, the piston 23 is stopped at the top dead center position in the cylinder 20.

  In this state, when the operator grips the handle 4 and presses the nail driver 1 against the workpiece 28, the push lever 9 rises against the urging force of the spring 22 and is turned on and connected. The combustion chamber frame 10 is also lifted through the arm 8 and the combustion chamber frame 10 comes into contact with the lower end surface of the cylinder head 11, and the combustion chamber 26 is formed by the cylinder head 11, the combustion chamber frame 10, and the upper surface of the piston 23. (Step 106).

  Further, as the push lever 9 moves, the gas cylinder 30 is tilted toward the cylinder head 11 and the injection rod 30a of the gas cylinder 30 is pressed against the gas cylinder connection portion 25a of the cylinder head 11 so that the combustible liquefied gas in the gas cylinder 30 is fueled. It is injected only once from the injection port of the passage 25, and gas is sent into the combustion chamber 26 (step 107).

  Further, when the combustion chamber frame 10 rises to the stroke end (uppermost end) with the movement of the push lever 9, the switch 33 is turned on to supply electric power to the motor 18 and the rotation of the fan 19 is started (step 108). ). In the flowchart of FIG. 9, step 108 is after steps 106 and 107. However, the present invention is not limited to this, and it may be inserted before or between these two steps.

  As the fan 19 rotates in the combustion chamber 26 that has become a sealed space, the injected combustible gas is stirred and mixed with the air in the combustion chamber 26. Next, at step 109, it is determined whether or not the trigger switch 5 has been pulled by the operator, that is, whether or not the trigger switch 5 has been turned on. When the operator turns on the trigger switch 5 of the handle 4, the spark plug 12 ( FIG. 7) sparks and ignites the mixed gas. The ignited gas mixture burns and expands rapidly. The combustion / expanded mixed gas moves the piston 23 downward and moves until the piston 23 abuts against the bumper 24 in the cylinder 20. By this movement, the nail disposed in the nose 7 is pushed out by the driver blade 23a and driven into the driven material 28 (step 110).

  Thereafter, it is determined whether or not the push lever is turned off (step 111). When the push lever is turned off, the combustion chamber frame 10 is separated from the lower end surface of the cylinder head 11 and the side surface of the piston 23, so that the combustion chamber 26 is released. After this driving, the piston 23 comes into contact with the bumper 24 and most of the expanded combustion gas is discharged from the exhaust port 21 to the outside of the cylinder 20. The exhaust port 21 is provided with a check valve (not shown) such as a reed valve, and when the combustion gas is discharged to the outside of the cylinder 20 and the inside of the cylinder 20 and the inside of the combustion chamber 26 become atmospheric pressure. Check valve closes. The combustion gas remaining inside the cylinder 20 and the combustion chamber 26 is high temperature because it is after combustion. The combustion heat is absorbed from the inner wall of the cylinder 20 and the inner wall of the combustion chamber frame 10, and the cylinder 20 and the like become high temperature. . The absorbed heat is dissipated from the cylinder 20 and the outer wall surface of the combustion chamber frame 10 into the atmosphere.

  When the combustion heat of the combustion gas is absorbed by the cylinder 20 or the like, the combustion gas is rapidly cooled, the volume of the combustion gas is reduced, and the pressure in the closed space above the piston 23 is reduced to below atmospheric pressure (heat The piston 23 is pulled back to the initial top dead center position.

  Thereafter, when the main body of the nail driver 1 is lifted and the push lever 9 is separated from the driven material 28, the push lever 9 and the combustion chamber frame 10 are returned downward by the bias of the spring 22. Then, as shown in FIG. 2, the first flow path 41 and the second flow path 42 are released, and scavenging is performed. (Step 112). At this time, the fan 19 continues to rotate for a predetermined time under the control of the control unit 61 even if the trigger switch 5 is turned OFF (step 113). By generating the flow by the fan 19 in this way, clean air is taken in from the intake port 3a provided in the head cover 3, and the air after combustion is discharged from the discharge port 2a, and the air in the combustion chamber 26 is scavenged. Thereafter, the fan 19 stops and enters an initial stationary state, and the process returns to step 101. After the stationary state, the above steps 101 to 113 are repeated again, so that the nail can be driven again. Note that if the operation of the next step 105 is performed before a predetermined time has elapsed, steps 106 to 112 can be repeated without stopping the fan.

  As described above, according to one embodiment of the present invention, the occurrence of an event such as when the gas cylinder 30 is replaced, when the battery 4a is replaced, or when the nail to be driven is filled in the magazine 6 is triggered. In addition, in order to rotate the fan 19 in the reverse direction at a high speed for a certain time, the dust accumulated on the upper surface of the filter 16 is cleaned so as to be separated from the filter.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible in the range which does not deviate from the summary. For example, the timing of rotating the fan in the reverse direction is not limited to the case described above, and can be performed when there is no problem with the nail driving operation or after the driving operation is completed. When the operation is performed after the driving operation is completed, it is preferable to perform the operation after a predetermined time after the combustion gas is completely scavenged.

  For example, a timer may be provided in the control unit 61 to measure the timing of rotating the fan in the reverse direction so that the fan is rotated in reverse at a constant period. Alternatively, the number of nails to be driven may be measured, and the timing for reverse rotation of the fan may be determined according to the number.

  Furthermore, an air flow sensor is provided in the vicinity of the opening 11a (FIGS. 1 and 2), which is an air inlet, to detect a decrease in the inflow amount of air, and when the inflow amount decreases below a predetermined value, that is, the filter You may control so that a fan may reversely rotate when clogged. When the fan is rotating in the reverse direction, even if the operator turns on the push lever, the processing in steps 106 to 113 is not performed, and the operator must wait until the high-speed reverse rotation of the fan is completed. You can do that.

Further, in the present invention, the filter may be cleaned according to the will of the operator. In that case, a fan reverse rotation switch may be provided separately in the nailer. The place where the switch is attached is technically possible anywhere, but considering actual use, it becomes a place that gets in the way during work (for example, around the handlebar or head cover, which may be pressed during work), or a nail. It is necessary to exclude the place (for example, the side of the main body, which is in contact with the ground when placed sideways) when placing the hammer 1, and based on these, as shown in FIG. The place of c) is preferable.
(A) Near the side of the trigger switch 5 (b) Handle side of the gas cylinder part (c) Magazine part Of the above-mentioned places, the place (a) that can be operated with one hand while holding the handle is particularly preferred.

  When this fan reverse rotation switch is provided, it is determined whether or not the fan reverse rotation switch is turned on in addition to or instead of steps 101 to 103 in FIG. Then, it is preferable to proceed to step 104 and control the fan to rotate at a high speed for a certain time.

FIG. 5 is a partial cross-sectional view of the nail driver showing one embodiment of the present invention, and a view showing an air flow during a cleaning operation. FIG. 3 is a partial cross-sectional view of the nail driver showing an embodiment of the present invention, and shows an air flow during a normal nail driving operation. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the whole nailing machine which shows one Embodiment of this invention. The main body external view of the nailing machine which shows one Embodiment of this invention. The external view seen from the left direction of FIG. The external view seen from the upper direction of FIG. FIG. 5 is an external view seen from above when the head cover 3 and the head protector 44 of FIG. 4 are removed. The circuit diagram containing the forward / reverse switching circuit of the nailing machine by one Embodiment of this invention. The flowchart which shows operation | movement of the nail driver by one Embodiment of this invention. The figure for demonstrating the position which attaches the switch for fan reverse rotation by another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nailer 2 Housing 2b Housing opening 2c for chamber lock bar operation Housing opening 3 for fitting with handle 3 Head cover 3a, 4b Inlet 4 Handle 4a Battery
4c Projection 5 Trigger switch 6 Magazine 7 Nose 7a Nose lower end 8 Arm portion 9 Push lever 10 Combustion chamber frame 10a Chamber 10b Chamber head 11 Cylinder head 11a Opening portion 12 Spark plug 13 Motor holding cylinder 16 Filter 17 Cylinder chamber 18 Motor 19 Fan 20 Cylinder 21 Exhaust port 22 Spring 23 Piston 23a Driver blade 24 Bumper 25 Fuel passage 25a Connection portion 26 Combustion chamber 28 Material 30 Gas cylinder 30a Injection rod 33 Switch 41 First flow path 42 Second flow path 41a First flow path Reverse flow path 42a Second reverse flow path 44 Head protector 44a Scavenging hole 44b Guide section 44c Ventilation section 45 Conventional flow path 45a Branch flow path 46 Flow path from inside housing 50 Screw 51 Chamber lock bar 61 Control section 6 Interlock switch 63 and 65 control line 64 switches 66 and 67 resistance

Claims (11)

An intake port for introducing outside air into the combustion chamber; a dust filter is provided in the intake port; a fan is provided in the combustion chamber; and the fan is rotated by a motor, and the dust filter is interposed A combustion nailing machine that guides outside air into the combustion chamber,
A combustion nail driver characterized by comprising dust filter cleaning means for generating an air flow in a direction opposite to the air flow introduced into the combustion chamber.   The combustion nail driver according to claim 1, wherein the dust filter cleaning means includes reverse rotation means for rotating the fan in reverse.   The combustion nailer according to claim 2, wherein the reverse rotation means rotates the fan at a higher rotation speed than when rotating in the forward direction.   The combustion nail driver according to any one of claims 1 to 3, further comprising a switch for driving the dust filter cleaning means.   5. The combustion according to claim 4, wherein the combustion type nailer has a trigger switch for nail driving operation, and a switch for driving the dust filter cleaning means is provided separately from the trigger switch. Nail driver.   The combustion type nail driver according to any one of claims 1 to 5, wherein the dust filter cleaning means is driven for a predetermined time after the nail driving operation.   The combustion type nailer according to claim 2 or 3, wherein the reverse rotation means includes a forward / reverse switching circuit for inverting the polarity of electricity applied to the motor.   The combustion nail driver according to claim 1, wherein the dust filter cleaning means is a device for generating an air flow in a reverse direction attached to the combustion nail driver. An intake port for introducing outside air into the combustion chamber, a dust filter is provided at the intake port, a fan is provided in the combustion chamber, and the fan is rotated by a motor so as to pass through the dust filter; A combustion nailing machine that guides outside air into the combustion chamber,
A combustion type nailing machine characterized in that a cleaning operation is performed by rotating the fan in the reverse direction to generate an air flow in a direction opposite to the air flow flowing through the dust filter.   The combustion nailing machine according to claim 9, wherein the combustion nailing machine has a control circuit for controlling rotation of the motor, and reverse rotation of the fan is controlled by the control circuit. The combustion type nailing machine according to claim 10, wherein the reverse rotation of the fan is rotated at a higher rotational speed than when rotating in the forward direction.