Patent application number | Description | Published |
20080251558 | Driving power tool - It is an object of the invention to provide a technique for preventing power tool from being operated by a malfunction of the control circuit. A representative driving power tool includes a movable element, a drive unit to drive the movable element, an actuation circuit to actuate the drive unit, a control circuit and an operation switch that outputs an operation signal. The control circuit outputs a control signal when the operation signal for instructing driving of the movable element is outputted from the operation switch. The actuation circuit actuates the drive unit when the control signal is outputted from the control circuit. Actuation of the drive unit is blocked when the control signal outputted from the control circuit is abnormal. According to the invention, a movable element can be prevented from being moved by malfunctioning of the control circuit. | 10-16-2008 |
20090165615 | Table saws - A table saw | 07-02-2009 |
20100001675 | Electric Power Tool - An electric power tool is provided that includes a motor as a driving source, a first operation switch, a first semiconductor switch, and a second semiconductor switch. The first operation switch is operated by a user to be turned ON/OFF. The first semiconductor switch, provided on a current path from the power source to the motor, includes at least one semiconductor switching device. When the first operation switch is OFF, the first semiconductor switch is turned OFF to interrupt the current path. When the first operation switch is ON, the first semiconductor switch is turned ON to close the current path. The second semiconductor switch is provided on the current path in series with the first semiconductor switch and includes at least one semiconductor switching device. The second semiconductor switch closes/interrupts the current path by being turned ON/OFF in accordance with an input control signal. | 01-07-2010 |
20100102102 | ELECTRIC DRIVE TOOL - In an electric drive tool which performs a driving operation with an electric motor as a driving source, the driving operation was performed previously by a first operation for moving a contact trip upward and a second operation for turning on a trigger, and it is desired to ensure prevention of an erroneous operation of the trigger. According to the present invention, prevention of an erroneous operation of the trigger is ensured. | 04-29-2010 |
20100116863 | ELECTRIC DRIVE TOOL - The electric drive tool of the invention is configured such that a lock lever is provided to reliably prevent an erroneous operation of a trigger and an operating mode can be switched by changing an operational sequence of this lock lever and a contact trip. | 05-13-2010 |
20100176176 | COMBUSTION TYPE DRIVING TOOLS - A fan switch and an ignition switch are arranged such that the moving directions of operating buttons thereof cross the moving directions of a contact lever and the moving direction of a switch lever, respectively. | 07-15-2010 |
20100237126 | DRIVE TOOL - A drive tool includes an ejector, a press member, a press detection switch, an operation member, an operation detection switch, a control unit, an operation state detector, and a report unit. The control unit makes the ejector carry out ejection of a fastening tool when the press detection switch and the operation detection switch are turned on. The operation state detector detects a case where the drive tool comes into one of a plurality of kinds of preset operation states which include at least one operation state other than a state of a battery. Report patterns different for each of the plurality of kinds of operation states are set in the report unit. When one of the operation states is detected by the operation state detector, the report unit reports the detection using the report pattern set corresponding to the detected operation state. | 09-23-2010 |
20120079799 | ELECTRIC POWER TOOL - An electric power tool is provided that includes a motor as a driving source, a first operation switch, a first semiconductor switch, and a second semiconductor switch. The first operation switch is operated by a user to be turned ON/OFF. The first semiconductor switch, provided on a current path from the power source to the motor, includes at least one semiconductor switching device. When the first operation switch is OFF, the first semiconductor switch is turned OFF to interrupt the current path. When the first operation switch is ON, the first semiconductor switch is turned ON to close the current path. The second semiconductor switch is provided on the current path in series with the first semiconductor switch and includes at least one semiconductor switching device. The second semiconductor switch closes/interrupts the current path by being turned ON/OFF in accordance with an input control signal. | 04-05-2012 |
20120169256 | ELECTRIC POWER TOOL - An electric power tool includes: a motor; a manipulation input receiving unit which receives a user manipulation input for rotating the motor; a mode changeover unit that has one manipulation portion which manipulated by the user; a rotation drive force transmitting unit that switches a transmission mechanism to one of the transmission mechanisms corresponding to the set position of the manipulation portion and transmits a drive force of the motor to a tool output shaft via the switched transmission mechanism; an electric signal output unit that outputs an electric signal corresponding to the set position of the manipulation portion; and a motor control unit that sets the control method of the motor to a control method preset for the electric signal, among a plurality of different types of control methods, based on the electric signal, and controls the motor by the set control method, based on manipulation by the user. | 07-05-2012 |
20120234573 | POWER TOOL - A power tool includes a motor, a rotating speed adjusting switch, a regulating member, and a control unit. The regulating member regulates an upper limit position when the switch is displaced by manipulation by a user into an upper limit of any one of stages by the manipulation by the user. The control unit controls an amount of a current flowing to the motor by a duty ratio based on a manipulation amount of the switch, thereby increasing the rotating speed of the motor in accordance with an increase of the manipulation amount. A predetermined set number of duty ratios are set for each of the stages. A proportion of the predetermined set number of duty ratios to a manipulable amount of the switch is higher in a first stage having the lowest upper limit position than in the stages other than the first stage. | 09-20-2012 |
20120256570 | DRIVE DEVICE FOR SINGLE-PHASE SERIES COMMUTATOR MOTOR - A drive device of the present invention includes a pair of drive switches, a first diode, a switching element, a current detection unit, a capacitor, a second diode, and a current control unit. The first diode, the switching element, and the current detection unit are arranged, in this order from one end of an armature in a motor, on a braking current path that is formed of the armature and a field winding in the motor when the pair of drive switches is in a brake position. The second diode is adapted to keep allowing a braking current to flow through the field winding when the switching element is in an off-state by directly connecting a partial path between the switching element and the current detection unit on the braking current path and the other end of the armature. | 10-11-2012 |
20120279743 | ELECTRIC POWER TOOL - An electric power tool includes an electric motor, a rotation speed detection device, a brake device, and a rotation speed-based activation device. The electric motor generates a driving force to rotate an object to be driven. The rotation speed detection device detects a rotation speed of the electric motor. The brake device executes braking control to brake the electric motor. The rotation speed-based activation device activates the brake device when the rotation speed detected by the rotation speed detection device becomes equal to or less than a specified rotation speed, which is arbitrarily set, after a stop command to shut off electric current supply to the electric motor is issued. | 11-08-2012 |
20130076271 | ELECTRIC POWER TOOL - An electric power tool of the present invention includes: a lighting unit; a motor that drives a tool element; a setting switch that is turned ON/OFF to change an operation mode setting and a lighting mode setting; a setting switching unit that changes the operation mode setting and the lighting mode setting corresponding to a manner of operation provided to the setting switch; a motor control unit that controls the motor according to a control method for one of the operation modes currently set by the setting switching unit; and a lighting control unit that controls the lighting unit corresponding to one of the lighting modes currently set by the setting switching unit. When the setting switch is turned on, the setting switching unit changes one of the operation mode setting and the lighting mode setting corresponding to a duration time of an ON state of the setting switch. | 03-28-2013 |