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1. (EP2459347) OUTIL À IMPACT
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims

1. An impact tool (1) comprising:

a motor (3) drivable in an intermittent driving mode;

a hammer (41) connected to the motor;

an anvil (46) to be struck by the hammer to thereby rotate/strike a tip tool; and

a control unit (51) adapted to control a rotation of the motor by switching a driving pulse supplied to the motor in accordance with a load applied onto the tip tool;

characterized in that the control unit is adapted to switch the driving pulse based on a change in a driving current flowing into the motor.


  2. The impact tool (1) of Claim 1,
wherein the control unit (51) is adapted to switch the driving pulse based on a rotation number of the motor (3).
  3. The impact tool of Claim 2,
wherein the control unit (51) is adapted to change the output time of the driving pulse in accordance with the load on the tip tool.
  4. The impact tool (1) of Claim 2,
wherein the control unit (51) is adapted to change an effective value or a maximum value of the driving pulse in accordance with the load on the tip tool.
  5. The impact tool (1) of Claim 1,
wherein the intermittent driving mode includes:

a first intermittent driving mode in which the motor (3) is driven only in a normal rotation; and

a second intermittent driving mode in which the motor is driven in the normal rotation and in a reverse rotation.


  6. The impact tool (1) of Claim 1, wherein the impact tool is a power tool comprising:

an output shaft formed at a front end of the anvil (46) and rotated in a normal rotation direction by the motor (3);

wherein a control method of the motor is automatically changed according to a current value occurring when a signal is imparted so as to reversely rotate the motor.


  7. The impact tool (1) of Claim 6, wherein:

the hammer (41) is adapted to be rotated in a normal rotation direction or a reverse rotation direction by a driving force being supplied thereto from the motor (3); and

the anvil (46) is provided separately from the hammer and adapted to be rotated by torque being supplied by the rotation of the hammer in the normal rotation direction;

wherein the impact tool further comprises

a tip tool holding portion capable of holding a tip tool and transmitting the rotation of the anvil to the tip tool; and

an electric power supply unit which supplies the motor with normal rotation electric power or reverse rotation electric power; and

wherein the control unit (51) is adapted to control the electric power supply unit so as to supply the normal rotation electric power to the motor in order to rotate the anvil integrally with the hammer during a predetermined period, and to supply the reverse rotation electric power to the motor when the predetermined period has elapsed, and to control the electric power supply unit so as to switch between the normal rotation electric power and the reverse rotation electric power in a first switching cycle if an electric current which flows into the motor by the reverse rotation electric power is equal to or greater than a first predetermined value, and to switch between the normal rotation electric power and the reverse rotation electric power in a second cycle if the electric current is less than the first predetermined value.


  8. The impact tool (1) of Claim 6, wherein:

the hammer (41) is adapted to be rotated in a normal rotation direction or a reverse rotation direction by a driving force being supplied thereto from the motor (3); and

the anvil (46) is provided separately from the hammer and adapted to be struck and rotated by the rotation of the hammer, which has gained acceleration distance due to rotation in the reverse rotation direction, in the normal rotation direction;

wherein the impact tool further comprises

a tip tool holding portion capable of holding a tip tool and transmitting the rotation of the anvil to the tip tool;

an electric power supply unit which alternately switches normal rotation electric power or reverse rotation electric power in a first cycle so as to be supplied to the motor; and

a temperature detection unit which detects the temperature of the motor; and

wherein the control unit (51) is adapted to control the electric power supply unit so as to switch between the normal rotation electric power and the reverse rotation electric power in a second cycle longer than the first cycle if the temperature of the motor has risen to a predetermined value.


  9. The impact tool (1) of Claim 1, wherein the impact tool is an electronic pulse driver and wherein:

the motor (3) is capable of normally rotating and reversely rotating;

the hammer (41) is adapted to be rotated in a normal rotation direction or a reverse rotation direction by a driving force being supplied thereto from the motor; and

the anvil (46) is adapted to be struck and rotated by the rotation of the hammer, which has gained acceleration distance due to rotation in the reverse rotation direction, in the normal rotation direction;

wherein the impact tool further comprises

a tip tool holding portion capable of holding a tip tool and transmitting the rotation of the anvil to the tip tool; and

an electric power supply unit adapted to alternately switch between normal rotation electric power or reverse rotation electric power so as to be supplied to the motor; and

wherein the control unit (51) is adapted to control the electric power supply unit so as to increase the ratio of a period during which the reverse rotation electric power is supplied with respect to a period during which the normal rotation electric power is supplied, with an increase in an electric current which flows into the motor.


  10. The impact tool (1) of Claim 9,
wherein the control unit (51) is adapted to control the electric power supply unit in a first mode in which the normal rotation period during which the normal rotation electric power is supplied is reduced, in a first step where the electric current which flows into the motor (3) increases to a predetermined value, and controls the electric power supply unit in a second mode in which the reverse rotation period during which the reverse rotation electric power is supplied is increased, in a second step where the electric current which flows into the motor has exceeded the predetermined value, the control unit preferably being capable of selecting one mode from a plurality of second modes with different ratios, in the second step.
  11. The impact tool (1) of Claim 10,
wherein the control unit (51) is adapted to permit only shifting to a second mode with a long reverse rotation period from a second mode with a short reverse rotation period or to a second mode which is adjacent in the length of the reverse rotation period, among a plurality of second modes with different ratios, in the second step.
  12. The impact tool (1) of Claim 1, wherein the impact tool is a power tool,
wherein the time during which the hammer (41) is normally rotated is gradually decreased and wherein, preferably, the time during which the hammer is reversely rotated is gradually increased.
  13. The impact tool (1) of Claim 12, further comprising:

a detecting means (59) capable of detecting the value of an electric current which flows into the motor (3),

wherein a first current value, a second current value greater than the first current value, and a third current value greater than the second current value are capable of flowing to the motor,

wherein a control is capable of being performed by a first mode according to the first current value, a second mode according to the second current value, and a third mode according to the third current value, and

wherein a control is performed in the second mode after the control in the first mode if the detecting means of the motor has detected the first current value and has detected the third current value immediately after the detection of the first current value.


  14. The impact tool (1) of Claim 12, further comprising:

a detecting means (59) capable of detecting the value of an electric current which flows into the motor (3),

wherein a first current value, and a second current value greater than the first current value are capable of flowing to the motor, and

wherein a control is capable of being performed by a first mode according to the first current value, and a second mode according to the second current value, and

wherein a control is not performed in the first mode after a control is performed in the first mode, and a control is performed in the second mode.


  15. The impact tool (1) of Claim 14,
wherein a third current value greater than the second current value is capable of flowing into the motor (3),
wherein a control is capable of being performed by the third mode according to the third current value, and
wherein a control is performed in the second mode or the third mode after the control in the second mode.
  16. The impact tool (1) of Claim 12, further comprising:

a detecting means (59) capable of detecting the value of an electric current which flows into the motor (3),

wherein a first current value, a second current value greater than the first current value, and a third current value greater than the second current value are capable of flowing to the motor, and

wherein a control is capable of being performed by a first mode according to the first current value, a second mode according to the second current value, and a third mode according to the third current value, and

wherein a control is performed in the third mode after the first mode if the first current value has been detected, and then the third current value has been detected.


  17. The impact tool (1) of Claim 12,
wherein a control method of the motor (3) is capable of being automatically changed, preferably according to the load of the motor or the amount of time, wherein the load of the motor may be an electric current generated in the motor.