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`tKUM Iiaya&Associaies 06-6
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`‘ 551lB(*)l3234/§§13223/Y§§%53061284
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`EJ
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`60 P
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`
`WHAT IS CLAIMED IS
`
`1. A rotary impact tool comprising:
`
`a rotary driving mechanism including a motor for rotating a
`
`driving shaft;
`
`a hammer engaged with the driving shaft;
`
`an output shaft to which a driving force is applied by impact
`
`blow of the hammer;
`
`a main switch operated by a user for controlling fastening
`
`operation;
`a torque setting switch used by a user for setting a fastening
`
`torque;
`
`a torque calculator for calculating a fastening torque; and
`a controller for controlling on and ofi‘ of the motor based on
`
`switching on and off of the main switch, an output of the torque '
`calculator and the fastening torque set in the torque setting switch,
`and having a normal fastening mode and a tight fastening mode;
`
`wherein
`a tight fastening mode setting switch used for setting the tight
`
`fastening mode is further comprised; and
`when the tight fastening mode setting switch is switched on,
`the controller continuously drives the rotary driving mechanism so as
`to perform tight fastening operation continuously.
`2. The rotary impact tool in accordance with claim 1 further
`
`comprising:
`a rotation angle sensor for sensing rotation angle of the output
`
`12
`
`
`
`FROM liaya&ftssoci§tes 06-6244-5972
`
`20055 55118(1)13:34/Efil3:23/Sz§§%5306128450 P 16
`
`shaft to which rotation force due to impact blow of the hammer is
`
`applied or a rotation angle of a shaft of the motor; wherein
`
`the torque calculator calculates the fastening torque based on
`
`an output of the rotation angle sensor; and
`
`the controller stops driving of the motor when the rotation
`angle obtained from an output of the rotation angle sensdr becomes
`equal to or larger than a predetermined reference value in the tight
`
`fastening mode.
`
`3.- The rotary impact tool in accordance with claim 2 further
`
`comprising:
`a tight fastening angle setting switch used for setting or
`varying the predetermined reference value set in the tight fastening
`
`mode.
`
`4. The rotary impact tool in accordance with claim 1,
`
`wherein
`
`the controller stops driving of the motor when a quantity of
`
`impact blows of the hammer corresponding to the fastening torque set
`
`in the torque setting switch.
`5. The rotary impact tool in accordance with claim 1,
`
`wherein
`the controller increases a level of phase of the fastening torque
`set in the torque setting switch by one, when a number of tight
`fastening operations reaches to a predetermined times.
`6. The rotary impact tool in accordance with claim 2,
`
`wherein
`
`13
`
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`In
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`in
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`
`the controller increases a level of phase of the fastening
`
`torque set in the torque setting switch by one, when a number of tight
`
`fastening operations reaches to a predetermined times.
`
`7. The rotary impact tool in accordance with claim 3,
`
`wherein
`
`the controller increases a level of phase of the fastening torque
`
`set in the torque setting switch by one, when a number of tight
`
`fastening operations reaches to a predetermined times.
`
`8. The rotary impact tool in accordance with claim 4,
`
`wherein
`
`the controller increases a level of phase of the fastening torque
`
`set in the torque setting switch by one, when a number of tight
`
`fastening operations reaches to a predetermined times.
`
`14
`
`
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