JP2003254247A - Air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a dustproof structure and operability of a power switch. <P>SOLUTION: An operation panel 48 of an air compressor has the power ON switch 90 and a power OFF switch 92. The power ON switch 90 and the power OFF switch 92 have a fixed contact 112 and a movable contact 118 arranged at the inside of a sealed space 124 covered with a surface sheet 120 and have a dustproof structure to prevent dust from the outside from entering the sealed space 124. A movable side flexible substrate 116 electrically conducts because the substrate 116 deforms to a lower side when pressed from an upper side to bring the movable contact 118 into contact with the fixed contact 112 since the substrate 116 is elastically deformable. When a plug of a power cord is inserted into a receptacle in a state of power ON data stored into a memory 96, a driving part is started as it is to start a compression operation of the air compressor, and a power switch operation is not required to simplify a restarting operation. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air compressor,
In particular, the present invention relates to an air compressor used with a plurality of electric tools at a construction site or the like. The present invention relates to an air compressor configured to drive or stop a driving unit according to the pressure of a tank that stores compressed air generated by an air compression unit. 2. Description of the Related Art For example, in a construction site or the like, a nailing machine for driving nails into wood or the like by the pressure of compressed air is used. As described above, the nailing machine used outdoors is configured to be supplied with the compressed air generated by the air compressor capable of being transported and drive the nail loaded in the nail loading section with air pressure. [0003] This type of air compressor includes a piston / cylinder unit (air compression unit) that sucks in air and compresses the air, a motor (drive unit) that drives the piston, a cover that covers the piston / cylinder unit and the motor, A tank for storing compressed air. [0004] The control unit mounted on the air compressor includes:
The tank pressure is monitored, and the motor is driven to fill the tank with compressed air until the tank pressure reaches the upper limit.When the tank pressure reaches the upper limit, the motor is temporarily stopped. When the pressure in the tank drops to the lower limit, the motor is started again to fill the tank with compressed air. As a power switch of the air compressor, for example, a switch called a rocker switch having a configuration in which an operation knob is held in an operation position in a toggle manner has been adopted. This type of switch needs to have a dustproof structure in an environment where dust is scattered, such as a construction site. Therefore, conventionally, the switch has been covered with a protective cover molded of a transparent resin material. When an air compressor is used in a place having relatively few outlets, such as a construction site, a plurality of electric tools are used at the same time. Sometimes you have to use it. When the rocker switch is turned on or off, the rocker switch is held at the operating position. For example, the outlet may be pulled out by another worker, If another power tool is used at the same time and the breaker falls, the air compressor can be restarted simply by plugging in the outlet again. However, since the rocker switch is relatively expensive, the manufacturing cost is high, and it is necessary to attach a protective cover to the dust-proof structure as described above around the switch. There has been a problem that the assembling work is complicated and the working efficiency is reduced. Therefore, an object of the present invention is to provide an air compressor which has solved the above-mentioned problems. [0010] The present invention has the following features to solve the above-mentioned problems. The present invention provides an air compression unit that sucks and compresses air, a driving unit that drives the air compression unit, a non-self-holding power switch that turns on and off power to the driving unit, and a power switch that turns on. Storage means for storing power-on information when operated, and resetting power-on information when the power switch is operated off; a tank for storing compressed air generated by the air compression unit; Drive unit control means for driving or stopping the drive unit according to the pressure of the power supply, and when the power-on state is stored in the storage means, the power supply to the drive unit is turned on before the power switch is turned on. Power control means;
The power switch has a dustproof structure, so that a protective cover can be omitted and the cost of the power switch can be reduced. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the air compressor according to the present invention. FIG. 2 is a perspective view showing a state where the cover 22 is removed. FIG. 3 is a side view of the air compressor. FIG. 4 is a plan view of the air compressor. FIG. 5 is a front view of the air compressor. FIG. 6 is a rear view of the air compressor. As shown in FIGS. 1 to 6, the air compressor 10 is configured to supply compressed air to a pneumatic nailer (not shown) outdoors, for example, at a construction site. It is a small compressor. In the air compressor 10, a pair of cylindrical tanks 14, 16 formed in a frame 12 are supported in parallel, and an upper part of the tanks 14, 16 has an air compressor for generating compressed air. 18 and a drive unit 20 for driving the air compression unit 18 are mounted. In addition, tank 1
A resin cover 22 integrally formed so as to cover the air compression section 18 and the drive section 20 is attached to the upper portions of the sections 4 and 16. At the lower part of both ends of the tanks 14, 16,
Legs 24 to 27 are provided. In addition, Frame 1
The gripping portions 28, 30 formed in a U-shape are provided at both ends of
Is fixed. The air compressor 10 is provided with
0 is gripped and transported. The air compressor 10 includes an air compressor 18.
Are provided on both sides. The air discharge units 32 and 34 are provided with pressure regulating valves 36 and 38 connected to the outlet pipes (not shown) of the tanks 14 and 16, and a pressure for displaying the discharge pressure value adjusted by the pressure regulating valves 36 and 38. Discharge ports 44 to 47 for discharging compressed air having pressures adjusted by the pressure adjustment valves 36 and 38 in total.
And The pressure regulating valves 36 and 38 are
a and 38a are rotated to adjust the discharge pressure. The outlets 44 to 47 are provided with quick couplers to which hoses (not shown) connected to the nailing machine are connected. Further, an operation panel 48 is provided above the cover 22. The operation panel 48 is provided with a power switch and various display lamps, and is provided in the recessed portion 23 of the cover 22 so that the power is not turned off even when an object is placed. As shown in FIG. 2, the cover 22 is detachably attached and is detached from the frame 12 when the air compressor 18 and the drive unit 20 are maintained. Thus, when the cover 22 is removed, the tank 1
4, pressure control valves 36, 38, pressure gauges 40, 42,
The discharge ports 44 to 47 are exposed. Here, the configurations of the compression section 18 and the drive section 20 will be described. FIG. 7 is a cross-sectional view showing the internal configuration of the compression unit 18 and the drive unit 20. As shown in FIG. 7, the compression section 18 has piston-cylinder mechanisms 62 and 64 arranged on both sides of a casing 60. This piston / cylinder mechanism 6
2, 64 are formed in directions different from each other by 180 °. The piston / cylinder mechanisms 62 and 64 include pistons 62a and 64a, cylinders 62b and 64b,
Connecting rods 62c, 64c and cylinder heads 62d, 64
d. In FIG. 7, the piston 64a is
Hidden and invisible. The casing 60 includes a first chamber 60a for accommodating a rotating part of the compression section 18, a second chamber 60b for accommodating a filter 66 provided in a path for introducing compressed air, and a driving section 20. And a third room 60c in which the motor 68 is stored. The compression section 18 compresses air to a high pressure by a two-stage compression system. After the first stage piston / cylinder mechanism 62 compresses the air introduced from the air inlet 22m, the second stage compresses the air. Is further compressed by the piston / cylinder mechanism 64 and stored in the tanks 14 and 16. The tanks 14 and 1
6 are maintained at the same pressure because they are in communication with each other. The first stage piston / cylinder mechanism 6
The second and second-stage piston / cylinder mechanisms 64 are connected via a communication pipe (not shown). One end of each of the connecting rods 62c and 64c is formed integrally with each of the pistons 62a and 64a.
It is supported on a rotating shaft 74 via 0,72. The rotating shaft 74 is rotatably supported by a bearing 76 held by a partition 60 d of the casing 60 and a bearing 78 held inside a motor cover 79. A first fan (impeller) 80 for sucking compressed air from the first air inlet 22m is fixed to one end 74a of the rotating shaft 74. Also, the rotating shaft 7
A second fan (impeller) 82 for sucking motor cooling air from the air inlet 22n is provided at the other end 74b of the fourth fan 4.
Is fixed. An air inlet 22 m is provided by the first fan 80.
Is blown onto the surfaces of the casing 60 and the piston / cylinder mechanisms 62 and 64 to cool it, and a part of the air is filtered through the filter 66 and then compressed by the first-stage cylinder 62b. After the second
It is supplied to the stage cylinder 64b and further compressed. The second fan 82 is provided at the entrance 79 a of the motor cover 79, and sucks air for cooling the motor 68 and sends it around the motor 68. The motor 68 includes a magnet (rotor) 68a fixed to the rotating shaft 74, a stator 68b disposed on the outer periphery of the magnet 68a, and a coil 68c wound inside the stator 68b. This motor 6
Numeral 8 is reduced in size and weight, and reciprocates the pistons 62a and 64a via the rotating shaft 74 and drives the fans 80 and 82 to rotate. In the drive section 20, the fan 82 and the motor 68 are housed inside a cylindrical motor cover 78, and the rotation of the fan 82 causes the air inlet 22 to rotate.
n is sucked in from outside, passes through the inside of the motor cover 79, and is exhausted from the plurality of exhaust holes 22s. Inside the motor cover 79, the flow rate of the air flow generated by the rotation of the fan 82 increases as shown by the arrow in FIG.
8 is cooled. Here, the configuration of the operation panel 48 will be described. FIG. 8 is a diagram showing a configuration of the operation panel 48.
(A) is a top view, (B) is a figure which shows the procedure of lighting, extinguishing, and blinking of LED. As shown in FIG. 8A, the operation panel 48 includes a power ON switch 90 and a power OFF switch.
A switch 92, a pressure display for red LED 88 ₁ to 88 ₆ for displaying the pressure change in the tank 14, 16 (-)
When energization display red LED 88 ₇ for displaying the presence or absence of energization
() And operating state display green LE for displaying the operating state
D88 ₈ () and is provided. The power ON switch 90 and the power OFF switch 92 comprise a membrane switch (momentary switch) which switches from OFF to ON when pressed, and remains OFF when not pressed. The LEDs 88 _{1 to} 88 ₈ (to) are
It consists of a light emitting diode soldered on a substrate (not shown) arranged below the operation panel 48, and a rectangular lens is exposed on the operation panel 48. Incidentally, the red LED88 ₁ ~88 ₆ (~) is a tank 14,1
It is turned on or off stepwise according to the pressure change in 6,
The pressure values in the tanks 14 and 16 are displayed according to the number of lighting. As shown in FIG. 8B, in procedure 1,
The plug of the power cord (not shown) of the air compressor 10 is A
When plugged into the outlet of C100V, the red LED 88 ₇ () for energization display is turned on to indicate that it is energized. [0034] Next in step 2, with the power ON switch 90 turns off the red LED energization displayed by being pressed, the operating status display green LED 88 ₈ () a is lit the motor 68 is a piston-cylinder mechanism 62,
64 is driven to indicate that the compression operation is being performed. [0035] In the next step 3, the pressure value in the tank 14, 16 reaches the upper limit pressure P1, blink the operating status display green LED 88 ₈ () as informing means an air compressor 10 a standby state ( Operating state, but with the motor 68 stopped). In the next step 4, when the pressure value in the tanks 14 and 16 reaches the lower limit pressure P2, the operating state display green L
The ED 88 ₈ () is turned on to indicate that the air compressor 10 is in a compressed state (the operation of the motor 68 is restarted). In the next step 5, the power supply OFF switch 92
Is pressed, a red LED 88 for energization display is displayed.
₇ Turn on (), and display the operating status green LED
D is turned off, the motor 68 is stopped, and the compression operation by the piston / cylinder mechanisms 62, 64 is stopped. FIG. 9 is a block diagram showing a configuration of each electric system provided in the air compressor 10. As shown in FIG. As shown in FIG. 9, the control unit 94 of the air compressor 10 includes the LED 8
8 _{1-88 8} (~), the motor 68, the power ON switch 90, in addition to the memory 96 of the power OFF switch 92, and a pressure sensor 98 are connected. The control unit 95 controls ON / OFF of the motor 68 according to the pressure value detected by the pressure sensor 98 as described later, and controls each LED 88 ₁
Lit to 88 ₈ (-), off, performs control for performing the display control by blinking. The memory 96 also functions as storage means for storing on / off information of the power ON switch 90 and the power OFF switch 92 as described later. The pressure sensor 98 is connected to the tank 14,1.
6 is a pressure detecting means for detecting the pressure inside 6, and is configured to output a signal (voltage) according to a change in pressure. The memory 96 is, for example, a nonvolatile RAM
(EEPRAM), and can retain the stored data even when the power is turned off. Here, the power ON switch 90 and the power O
The configuration of the FF switch 92 will be described. In addition, power supply O
Since the N switch 90 and the power OFF switch 92 have the same configuration, the configuration of the power ON switch 90 will be described below. FIG. 10 is a longitudinal sectional view showing the configuration of the power ON switch 90 in an enlarged manner. As shown in FIG.
The power ON switch 90 is a thin, non-self-holding membrane switch having a thickness of 1 mm, and includes a fixed-side flexible substrate 110 and a movable-side flexible substrate 116.
Are arranged to face each other with the spacer 122 interposed therebetween. In the closed space 124 formed by the spacer 122, the fixed contact 112 printed on the upper surface of the fixed-side flexible substrate 110 and the movable-side flexible substrate 1
The movable contact 118 printed on the lower surface of the lower surface 16 is opposed to the movable contact 118 in close proximity. An adhesive layer 114 for fixing is formed on the lower surface of the fixed-side flexible substrate 110, and a top sheet 120 is covered on the upper surface of the movable-side flexible substrate 116 without gaps. As described above, the power ON switch 90 has the fixed contact 112 and the movable contact 118 disposed inside the closed space 124 covered by the top sheet 120.
A dustproof structure is provided so that dust from the outside does not enter the closed space 124. The fixed contact 112 and the movable contact 118 are normally separated and in an off state. Since the movable flexible substrate 116 is elastically deformable, when pressed from above, the movable flexible substrate 116 is deformed downward and the movable contact 118 comes into contact with the fixed contact 112 and becomes electrically conductive. As described above, the power ON switch 90 is made thin and has a dustproof structure by itself, and is manufactured at low cost. When the pressing force is removed, the power ON switch 90 returns to the OFF state because the movable contact 118 returns upward and separates from the fixed contact 112. for that reason,
The power ON switch 90 is a push switch that switches to the ON state only when pressed and outputs a signal in a pulse form. FIGS. 11A to 11G are timing charts showing pressure changes due to the operation of the air compressor 10 and control operation examples of each device. As shown in FIG. 11 (A), the operation of the air compressor 10 is started and the tanks 14 and 16 are started.
When the pressure in the tank gradually increases and the pressure in the tanks 14 and 16 reaches a preset upper limit pressure P1, FIG.
As shown in (2), the motor 68 stops and enters the standby state, during which time the compressed air in the tanks 14 and 16 is consumed and the tank pressure drops. Then, as shown in FIG.
When the pressure in the tanks 14 and 16 decreases to a preset lower limit pressure, as shown in FIG.
8 is restarted, and the supply of compressed air to the tanks 14 and 16 is performed. Thereby, the pressure in the tanks 14 and 16 gradually increases with the supply of the compressed air. Thereafter, when the pressure in the tanks 14 and 16 increases to the upper limit pressure P1, the motor 68 stops again and enters a standby state. Thus, in the normal operation mode, the air compressor 10 alternately performs the compression operation state and the standby state. [0050] As shown in FIG. 11 (B), current display red LED 88 ₇ (), when the power cord of the air compressor 10 (not shown) is inserted into the outlet AC100V (Fig 11 (G) (See FIG. 1), the light turns on to indicate that the power is on, and the power is turned off when the power ON switch 90 is pressed (step 1). [0051] As shown in FIG. 11 (C), the operating status display green LED 88 ₈ () is the power ON switch 9
The light is turned on when 0 is pressed, indicating that the motor 68 is driving the piston / cylinder mechanisms 62 and 64 (procedure 2). Also, a green LED 88 for operating state display
₈ () indicates that the pressure value in tanks 14 and 16 is
When it reaches 1, it blinks to indicate that the air compressor 10 is in a standby state (procedure 3). When the pressure value in the tanks 14 and 16 reaches the lower limit pressure P2, the green LED 88 ₈ () for displaying the operating state is turned on and the air compressor 10 is turned on.
Is displayed as a compression operation state (procedure 4). As shown in FIG. 11D, the power is turned on.
The switch 90 is turned on by an operator's pressing operation, and outputs an ON signal to the control unit 94. When there is an ON signal from the power ON switch 90, the control unit 94 stores the power ON data in the memory 96 and holds the power ON state. As shown in FIG. 11E, the power supply OF
The F switch 92 is turned on by an operator's pressing operation, and outputs an off signal to the control unit 94. In the control unit 94, when there is an off signal from the power supply OFF switch 92,
The power-on data stored in the memory 96 is reset and switched to the power-off state, and the power-off state is maintained. FIG. 12 is a flowchart showing the control processing executed by the control section 94. In FIG. 12, the control unit 9
4 is step S11 (hereinafter, "step" is omitted).
When the power cord (not shown) of the air compressor 10 is plugged into an AC 100 V outlet, the red LED 88 ₇ () for energization display is turned on. In the next step S12, the power-on data stored in the memory 96 is read. In S13, the memory 9
If the power-on data is stored in No. 6, since the power cord was unplugged from the outlet without operating the power-off switch 92 at the previous stop, the process proceeds to S16 based on the power-on data to drive the motor 68. Then, the compression operation by the piston / cylinder mechanisms 62 and 64 is started. In this case, the power supply to the motor 68 is automatically restarted even if the power ON switch 90 is not turned on. If the power-on data is not stored in the memory 96 in step S13, the power-off switch 92 was operated at the previous stop.
To check whether the power ON switch 90 has been turned on. If the power ON switch 90 is not turned on in S14, the process returns to S11, and the energization display red LED is turned on. Therefore, it turns out that the power ON switch 90 is not turned on by the lighting of the energization display red LED 88 ₇ (). In S14, when the power ON switch 90 is turned ON, the process proceeds to S15, where the power ON data is stored in the memory 96 (storage means). Then, S
Proceeding to 16, the motor 68 is driven to start the compression operation by the piston / cylinder mechanisms 62, 64 (power control means). Subsequently, in S17, the red LED 8 for displaying electricity is displayed.
8 ₇ () is turned off to indicate that the energization of the motor 68 has started, and the green LED 88 for operating state display is displayed.
_8. Light () to indicate that the motor 68 drives the piston / cylinder mechanisms 62 and 64 to perform the compression operation. In the next S18, it is checked whether the pressure value in the tanks 14, 16 has reached the upper limit pressure P1 or more. In S18, when the pressure value P in the tanks 14, 16 measured by the pressure sensor 98 reaches the upper limit pressure P1, the process proceeds to S19, and the motor 68 is stopped (drive unit control means). Subsequently, in S20, the operating state display green L
ED88 ₈ () is blinked to indicate that the air compressor 10 is in a standby state (a state where the air compressor 10 is operating but the motor 68 is stopped). [0059] Thus, the operator is in the standby state of the air compressor 10 is stopped the motor 68 by flashing operating state display green LED 88 8 _(), it can be confirmed that it is not a malfunction. In the next S21, the power supply OFF switch 92
Check if is turned on. In S21, when the power OFF switch 92 is turned on, the process proceeds to S22, and the power on data stored in the memory 96 is reset. Then, the process proceeds to S23, where the motor 68 is stopped, and the green LED 8
8 ₈ () is turned off to indicate that the air compressor 10 is stopped. If it is determined in step S21 that the power supply OFF switch 92 has not been turned on, the flow advances to step S24 to check whether the pressure in the tanks 14, 16 has decreased to the lower limit pressure P2 or less. In S24, the pressure value P in the tanks 14, 16 measured by the pressure sensor 98
Does not reach the lower limit pressure P2, the flow returns to S21, and it is checked again whether the power OFF switch 92 has been turned ON. In S24, the pressure value P in the tanks 14, 16 measured by the pressure sensor 98 is reduced to the lower limit pressure P2.
Is reached, the process proceeds to S25, and the operating state display green L
The ED88 ₈ () is turned on, and the operation of the motor 68 is started to restart the compression operation by the piston / cylinder mechanisms 62 and 64 (drive unit control means). Subsequently, in S26, it is checked whether or not the power supply OFF switch 92 has been turned on. S2
If it is determined in step 6 that the power supply OFF switch 92 has not been turned on, the process returns to step S18, and the processing from step S18 is repeated. If it is determined in step S26 that the power supply OFF switch 92 has been turned on, the flow advances to step S22 to reset the power supply ON data stored in the memory 96 (storage means). Thereafter, the process proceeds to S23, stops the motor 68, to turn off the operation status display green LED 88 8 ₍₎ indicates that the air compressor 10 is in a stopped state. The above control processing is performed by the power OFF switch 92.
Is turned on, the motor 68 is only stopped, the process returns to S11 again, and the red LED 88
₇ Lights () to indicate that it is energized.
Then, when the plug of the power cord (not shown) is pulled out from the AC 100 V outlet, the power of the air compressor 10 is turned off. This makes it possible to confirm that the red LED 88 ₇ () for energization display is turned off and that the plug of the power cord (not shown) has been pulled out from the AC 100 V outlet. As described above, the operator operates the power cord (not shown) while the power-on data is stored in the memory 96.
Is plugged into an AC 100 V outlet, the motor 68 is started as it is, and the compression operation of the air compressor 10 is started. Therefore, a person other than the worker plugs the power cord (not shown) of the air compressor 10 into the AC 100
If the air compressor 10 is unplugged from the V outlet, the power supply to the motor 68 can be automatically restarted and the air compressor 10 can be restarted without operating the power ON switch 90. When the air compressor 10 is operated in a place having relatively few outlets, such as a construction site, even if a plurality of power tools are used at the same time and the breaker falls, automatically when the breaker is returned. The operation of the air compressor 10 can be resumed. In the above embodiment, the configuration in which two-stage compression is performed by the piston-cylinder mechanisms 62 and 64 has been described as an example in the above-described embodiment. However, the present invention is not limited to this. The configuration provided above may be used. In the above embodiment, the pair of tanks 1
Although the configuration having 4 and 16 has been described as an example, the configuration is not limited to this, and a configuration having one or three or more tanks may be used. As described above, according to the present invention, an air compressor for sucking and compressing air, a driver for driving the air compressor, and a non-self-holding type are provided. A power switch for turning on / off the power, storage means for storing power-on information when the power switch is turned on, and resetting the power-on information when the power switch is turned off; The power switch is turned on when the power-on state is stored in the storage unit, the driving unit control unit that drives or stops the driving unit according to the pressure in the tank, and the storage unit that stores the compressed air generated by A power control means for turning on the power to the drive unit before the operation is performed, so that the power switch can be made to have a dustproof structure, thereby eliminating the need for a protective cover and keeping the cost of the power switch inexpensive. It becomes possible. Further, when the power cord is plugged into the outlet while the power-on data is stored in the storage means, the drive unit is started as it is, and the compression operation of the air compressor can be started. Thus, the restart operation can be simplified. Further, when the air compressor is operated in a place having relatively few outlets such as a construction site, even if a plurality of power tools are simultaneously used and the breaker falls,
When the breaker is returned, the operation of the air compressor can be automatically resumed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an air compressor according to the present invention. FIG. 2 is a perspective view showing a state where a cover 22 of the air compressor is removed. FIG. 3 is a side view of the air compressor. FIG. 4 is a plan view of the air compressor. FIG. 5 is a front view of the air compressor. FIG. 6 is a rear view of the air compressor. FIG. 7 is a cross-sectional view showing an internal configuration of the compression unit 18 and the drive unit 20. FIG. 8 is a diagram showing a configuration of an operation panel 48, FIG.
FIG. 3B is a plan view, and FIG. 3B is a diagram showing a procedure of turning on, off, and blinking an LED. FIG. 9 is a block diagram showing a configuration of each electric system provided in the air compressor 10. FIG. 10 is an enlarged longitudinal sectional view showing a configuration of a power ON switch 90. FIG. 11 is a timing chart showing a pressure change due to the operation of the air compressor 10 and an example of a control operation of each device. FIG. 12 is a flowchart illustrating a control process executed by a control unit 94; DESCRIPTION OF SYMBOLS 10 Air compressor 12 Frames 14 and 16 Tank 18 Air compressor 20 Drive 22 Covers 24 to 27 Legs 28 and 30 Grip 32 and 34 Air discharges 36 and 38 Pressure adjusting valves 40 and 42 Pressure total 44-47 discharge port 48 the operation panel 60 casing 62, 64 the piston-cylinder mechanism 66 filter 68 motor 79 motor cover 80 first fan 82 second fan ₈₈ 1-88 for ₆ pressure display red LED 88 ₇ for energizing the display Red LED 88 ₈ Green LED 90 for operating state display 90 Power ON switch 92 Power OFF switch 94 Control unit 96 Memory (storage means) 98 Pressure sensor

   ────────────────────────────────────────────────── ─── Continuation of front page    F-term (reference) 3H045 AA03 AA09 AA13 AA26 BA03                       BA31 CA28 DA01 EA34                 3H076 AA12 AA33 AA35 BB36 BB41                       BB43 CC07 CC31 CC41 CC91                       CC98

Claims (1)

Claims: 1. An air compressor for sucking air and compressing the air, a driver for driving the air compressor, and a non-self-holding type power supply for turning on / off the power to the driver. A power switch that stores power-on information when the power switch is turned on, and a storage unit that resets the power-on information when the power switch is turned off; A tank for storing the generated compressed air; a drive unit control unit for driving or stopping the drive unit according to the pressure in the tank; and a power switch when the power-on state is stored in the storage unit. Power supply control means for turning on the power supply to the drive unit before the air compressor is turned on.