Patent application number | Description | Published |
20120073077 | DUST COLLECTOR - A dust collector for suctioning dust includes: an electric motor for collecting dust; a power supply device that supplies electric power to outside; a parameter detection device that detects a parameter (hereinafter referred to as a “current parameter”) which changes depending on a state of a supplied current supplied by the power supply device; a determination device that determines whether or not a value of the current parameter detected by the parameter detection device satisfies a condition based on a threshold value stored in a first storage unit; and a current supply starting device that starts current supply to the electric motor when it is determined by the determination device that the value of the current parameter satisfies the condition. | 03-29-2012 |
20130133911 | ROTARY IMPACT TOOL - There is provided a rotary impact tool that includes: a motor; a hammer configured to be rotated by the motor; an anvil configured to be intermittently applied with an impact force in a rotation direction by a rotational force of the hammer; a rotation speed detection device configured to detect a rotation speed of the motor; an extreme value pair detection device configured to detect an extreme value pair, which is a pair of a maximum value and a minimum value of the rotation speed, based on the rotation speed detected by the rotation speed detection device; and an impact detection device configured to detect that the impact force is being applied when an extreme value difference, which is a difference between the maximum value and the minimum value, is equal to or more than a first threshold value. | 05-30-2013 |
20150135907 | POWER TOOL - A power tool of one aspect for tightening a screw to a tightening-target-object is provided with a motor as a drive force. A motor controlling device controls the motor so as to make rotational frequency of the motor in accordance with an input operation received by an input-operation receiving unit. A first setting unit sets a maximum rotational frequency to a given first maximum rotational frequency when the motor is initiated. If the power tool clears a given condition for increasing rotational frequency after the motor is initiated, a second setting unit sets the maximum rotational frequency to a given second maximum rotational frequency that is larger than the first maximum rotational frequency. | 05-21-2015 |
20150137717 | BRAKING APPARATUS FOR ELECTRIC POWER TOOL - One aspect of an embodiment of the present disclosure is a braking apparatus for an electric power tool that includes a switching circuit with six switching elements and a brake control unit. The brake control unit switches any one selected switching element of three switching elements forming one selected switch group of a high-side switch group and a low-side switch group to an off state from an on state at a timing at which braking current flows through a diode connected in parallel to the selected switching element upon turn-off of the selected switching element. | 05-21-2015 |
20150144365 | Rotary Impact Tool - A rotary impact tool according to one aspect of the present invention includes a motor, an impact mechanism, a drive unit, an impact detection unit, and a control unit. The control unit reduces a driving force for the motor caused by the drive unit when a count of impacts detected by the impact detection unit has reached a determination count set in advance, which is a value greater than one. | 05-28-2015 |
20150158157 | ELECTRIC POWER TOOL - An electric power tool to tighten a screw while drilling a hole with the screw in a tightening-target-object includes a motor as a drive source. A motor control unit controls the motor such that the rotation number of the motor is a rotation number according to specifics of an operation input received by an operation receiving unit with a preset maximum rotation number as an upper limit. At a start-up of the motor, the maximum rotation number is set to a first maximum rotation number. When it is detected that a hole has been drilled in the tightening-target-object with the screw after the start-up of the motor, the maximum rotation number is set to a second maximum rotation number lower than the first maximum rotation number. The second maximum rotation number is set according to a material thickness so as to become lower as the material thickness is smaller. | 06-11-2015 |
20150196987 | MOTOR DRIVEN APPLIANCE - A motor driven appliance in one aspect of embodiments of the present disclosure comprises a light source, a lighting unit, a motor, an operation unit, an operation detector, a reference signal output unit, a determination unit, and a control unit. The operation detector detects that the operation unit is operated, and outputs an operation detection signal that indicates that the operation unit is operated. The reference signal output unit outputs at least one reference signal that can be used as a reference for determining whether the detection by the operation detector is normal. The determination unit determines whether the operation unit is actually operated based on the operation detection signal and the at least one reference signal. The control unit controls operation of the lighting unit based on the determination made by the determination unit. | 07-16-2015 |
20150231770 | ROTARY IMPACT TOOL - There is provided a rotary impact tool that comprises: an impact mechanism, in which, when an external torque of a specified value or greater is applied to an anvil, a hammer impacts the anvil in a rotational direction; an impact detection unit configured to detect the impact; a fluctuation width detection unit configured to detect a fluctuation width of a physical quantity that fluctuates due to the impact; and a control unit configured to control driving of the motor according to the fluctuation width of the physical quantity when the impact is detected after a starting of the motor. | 08-20-2015 |