Abstract:
A power tool and operation method for quick locking and releasing working attachment thereof are provided. The power tool includes a housing; a motor in the housing; an output shaft driven by the motor; and a chuck to lock and release a working attachment, said chuck including a chuck body coupled with the output shaft, jaws movably disposed relative to the chuck body, and a clamping sleeve outside the chuck body. The clamping sleeve is movable with respect to the chuck body so as to drive the jaws to retract and open relative to the chuck body. A control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present invention relates to a power tool and operation method for quick locking and releasing working attachment thereof. 
         [0003]    2. Related Art 
         [0004]    A handheld power tool such as a drill is used to bore a hole in a workpiece such as a wood. A chuck used to lock a working attachment is installed on a main shaft of the handheld power tool. Drill bits of different specifications and types may be selected for the working attachment. When a drill bit is replaced and installed or is replaced, first, the chuck needs to be opened or a drill bit that is originally clamped in the chuck is released, an original drill bit is taken out of the opened chuck, and then, a new drill bit is inserted and then is locked in the chuck. There are about two forms of common chucks. A first chuck, such as a chuck device disclosed in the Chinese Patent Application CN201210036766.6, includes a chuck body coupled with a main shaft of an electric tool, a plurality of jaws movably disposed on the chuck body, and a clamping sleeve sleeved at an outer side of the chuck body and in a threaded connection to the jaws, where the clamping sleeve is rotated by hand, to make the clamping sleeve and a still output shaft relatively rotate; rotation of the clamping sleeve makes the jaws in screw thread fit with the clamping sleeve produce displacement reciprocally relative to the chuck body along an axial direction of the main shaft, and retraction or opening of the clamping jaws implements locking or releasing of the drill bit. A second chuck, such as a chuck device disclosed in the U.S. Pat. No. 7,198,439B2, includes a chuck body coupled with a main shaft of an electric tool, a plurality of jaws movably disposed on the chuck body, and a nut sleeve sleeved at an outer side of the chuck body and in a threaded connection to the chuck body, where the nut sleeve can move relative to an axial direction of the chuck body; axial movement of the nut sleeve can push the clamping jaws to produce displacement along the axial direction; the nut sleeve is rotated by hand, to make the nut sleeve and a still output shaft relatively rotate; rotation of the nut sleeve makes the nut sleeve reciprocally move relative to the chuck body along an axial direction of the main shaft; reciprocating movement of the nut sleeve can push the clamping jaws to produce displacement along the axial direction; and retraction or opening of the clamping jaws implements clamping or releasing of the drill bit. When the drill bit is quickly locked or released, the clamping sleeve or the nut sleeve needs to be fixed by hand to make the nut sleeve or the drill bit retain a still status relative to a housing, and then, a power switch of the electric tool is switched on; in this case, an electric motor drives the main shaft to rotate to drive the chuck body to rotate; and when the chuck body rotates relative to the clamping sleeve, the jaws produce displacement relative to the chuck body along the axial direction of the main shaft, to make the jaws lock or release the drill bit clamped in the jaws. However, in such an operation manner, when the drill bit is clamped or released to an extreme position, the clamping sleeve is engaged with a screw thread pair of the jaws or the nut sleeve is engaged with a screw thread pair of the chuck body, and the clamping sleeve or the nut sleeve also rotates, and causes friction with the hand, leading to a safety problem. 
         [0005]    Currently, on the market, some drills for which a drill bit can be quickly locked and released emerge, and an operation part that is controlled manually is generally disposed on such drills, where a clamping sleeve is first locked relative to a position of a housing, so that when the main shaft drives a chuck body to rotate, jaws can lock or release the drill bit. In addition, a drilling device is disclosed in the Chinese Patent Application CN201210143284.0, where a chuck of the drilling device has a clamping mode and a drilling mode; in clamping mode, the chuck is fixed relative to a housing, and a screw element moves forward or backward along an axial direction to adjust the clamping jaws to clamp or release; and in the drilling mode, a chuck body is driven by a main shaft to rotate. That is, the drill bit can be locked or released as long as either of the clamping sleeve and the chuck body can be locked relative to a position of the housing and the clamping sleeve and the chuck body relatively move. 
         [0006]    In order to make a main shaft rotate in locking or releasing mode, a rotation direction of the main shaft needs to be determined, that is, forward and reverse rotation control is performed, and then, a motor is started to make the main shaft rotate in set mode. In the prior art, locking of a clamping sleeve or a chuck body, forward and reverse rotation control, a start control structure are set separately, an operator needs to separately operate different parts to lock or release a drill bit; as a result, an operation is complex; in addition, a size of a power tool is huge due to many components and parts and complex connection relationships among the components and parts. 
       SUMMARY 
       [0007]    In order to solve the above technical questions, the present invention provides a compact-sized power tool easy to operate that the working attachment thereof being quick locked and released. 
         [0008]    The present invention is as follows: a power tool comprising: a housing; a motor disposed in the housing; an output shaft driven by the motor to output a rotary power; and a chuck configured to lock and release a working attachment, said chuck comprises a chuck body coupled with the output shaft, a plurality of jaws movably disposed relative to the chuck body, and a clamping sleeve sleeved outside the chuck body, the clamping sleeve is movable with respect to the chuck body so as to drive the plurality of jaws to retract and open relative to the chuck body; wherein the power tool further comprises a control mechanism, the control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated. 
         [0009]    Preferably, wherein the control mechanism comprises a control member being operable to move between an initial position and a working position, the control mechanism is active when the control member is located at the working position. 
         [0010]    Preferably, wherein the power tool further comprises a reversing member for controlling the rotary direction of the motor, the control mechanism further comprises a first transmission mechanism connected between the control member and the reversing member, the reversing member is activated by the first transmission mechanism when the control member moves from the initial position to the working position. 
         [0011]    Preferably, wherein the first transmission mechanism comprises a pair of reversing pushing blocks which are movably along the axial direction of the output shaft, and a reversing button which is movable along a direction perpendicular to the axial direction and is selectively slidable coupling with one of the reversing pushing blocks, the reversing pushing blocks are symmetrically disposed at two sides of the reversing button, the reversing button is configured to activate the reversing member. 
         [0012]    Preferably, wherein the control mechanism further comprises a connecting member connected with the control member, the connecting member is rotatable relative to the housing and provided with a pair of first slopes, the reversing pushing blocks are respectively provides with a first inclined plane abutted against the corresponding first slope and a second inclined plane abutted against the reversing button, the reversing button is provided with a pair of reversing slopes abutted against the second inclined planes respectively. 
         [0013]    Preferably, wherein the power tool further comprise a switch for switching on/off the motor, the control mechanism further comprises a second transmission mechanism connected between the control member and the reversing member, the switch is activated by the second transmission mechanism when the control member moves from the initial position to the working position. 
         [0014]    Preferably, wherein the second transmission mechanism comprises a pushing button which is movable along the axial direction of the output shaft, the control mechanism further comprises a connecting member which is connected with the control member and rotatable relative to the housing, and the connecting member provided with a pair of second slopes, the pushing button is provided with a pair of pushing button slopes alternatively abutted against the second slopes, the pushing button is configured to activate the switch. 
         [0015]    Preferably, wherein the control mechanism further comprises a clutch mechanism disposed between the control member and the clamping sleeve, the clutch mechanism is configured to be in an engaging status and a separating status, the clutch mechanism converts from the separating status to the engaging status when the control member moves from the initial position to the working position, so that the clamping sleeve is fixed relative to the housing. 
         [0016]    Preferably, wherein the clutch mechanism comprises a first clutch unit fixedly disposed relative to the clamping sleeve and a second clutch unit coupled with the control member, the second clutch unit is movable along the axial direction of the output shaft and is selectively engaged with the first clutch unit or separated from thereof. 
         [0017]    Preferably, wherein a stop device is disposed between the first clutch unit and the second clutch unit, the stop device is fixed relative to the housing, and a second spring is disposed between the stop device and the second clutch unit. 
         [0018]    Preferably, wherein a plurality of receiving chambers are disposed in the second clutch unit, and the second spring comprises a plurality of compression springs matched with the receiving chambers, the compression spring is at least partially supported in the receiving chambers. 
         [0019]    Preferably, wherein the control mechanism further comprises a transmission member which is disposed in the housing and coupled with the control member, the control member drives the second clutch to move along the axial direction of the output shaft by the transmission member when the control member moves from the initial position to the working position. 
         [0020]    Preferably, wherein a cam mechanism is disposed between the transmission member and the second clutch unit. 
         [0021]    Preferably, wherein the cam mechanism comprises a first cam part disposed in the transmission member and a second cam part disposed in the second clutch unit, the first cam part abuts against the second cam part by rotating of the control member and the second clutch unit moving along the axial direction of the output shaft. 
         [0022]    Preferably, wherein the first clutch unit comprises a first engaging member, the second clutch unit comprises a supporting part and a second engaging member axially slidably disposed on the supporting part, the second engaging member is selectively engaged with the first engaging member or separated from thereof. 
         [0023]    Preferably, wherein a first spring is disposed between the second engaging member and the supporting part. 
         [0024]    Preferably, wherein the first engaging member is configured as a ring gear, the second engaging member comprises a plurality of blocking pins being engagable with the ring gear, the supporting part comprises a plurality of restricting holes corresponding to the blocking pins, the blocking pins are at least partially received in the restricting holes, the first spring comprises a plurality of compression springs corresponding to the restricting holes, the compression springs are totally received in the corresponding restricting holes and abuts against the corresponding blocking pins. 
         [0025]    Preferably, wherein the clutch mechanism comprises a first clutch unit fixedly disposed relative to the clamping sleeve and a clutch assembly coupled with the control member, the clutch assembly comprises an engaging member and a clutch member, the engaging member is engagable with the first clutch unit and separated from thereof and is movable along the axial direction of the output shaft, the clutch member is engagable with the engaging member and separated from thereof and is movable along the axial direction of the output shaft. 
         [0026]    Preferably, wherein an elastic device is disposed between the control member and the housing, the elastic device is configured to provide an elastic force for returning the control member from the working position to the initial position. 
         [0027]    Preferably, wherein the control mechanism further comprises a clutch mechanism disposed between the control member and the clamping sleeve, the clutch mechanism is configured to be in an engaging status and a separating status, wherein the clutch mechanism converts from the engaging status to the separating status when the control member moves from the working position to the initial position, so that locking of the clamping sleeve relative to the housing is unlocked. 
         [0028]    Preferably, wherein the control mechanism further comprises a clutch mechanism disposed between the control member and the clamping sleeve, the clutch mechanism is configured to be in an engaging status and a separating status, wherein the power tool further comprises a retaining mechanism which is selectively engagable with the clutch mechanism or separated from thereof, the clutch mechanism is in the engaging status and engaged with the retaining mechanism when the control member moves from the initial position to the working position, so that the control member is retained in the working position. 
         [0029]    Preferably, wherein an elastic device is disposed between the control member and the housing, the clutch mechanism is separated from the retaining mechanism when the clutch mechanism is in the engaging status, the elastic device is configured to provide an elastic force to return the control member from the working position to the initial position. 
         [0030]    Preferably, wherein the control member is rotatable relative to the housing between the initial position and the working position, a rotation axis of the control member is parallel with or in line with the axis of the output shaft. 
         [0031]    Preferably, wherein the working position comprises a first working position and a second working position, the control mechanism controls the motor to initiate in a first predetermined direction when the control member is in the first working position, the control mechanism control the motor to initiate in a second predetermined direction which is opposite to the first predetermined direction. 
         [0032]    Preferably, wherein the first working position and the second working position are symmetrically disposed at two sides of the initial position. 
         [0033]    Preferably, wherein the power tool further comprises a reversing member for controlling the rotating direction of the motor and a switch for switching on/off the motor, the control mechanism is operable to fix the sleeve relative to the housing, activate the reversing member and then activate the switch during the control mechanism moving from the initial position to the working position. 
         [0034]    Preferably, wherein the control mechanism further comprises a clutch mechanism disposed between the control member and the clamping sleeve, the working position comprises a first working position, a second working position and a third working position, the clutch mechanism is disengaged when the control member is in the initial position; the clutch mechanism is engaged to fix the clamping sleeve relative to the housing when the control member is in the first working position; the reversing member is activated when the control member is in the second working position, the switch is activated when the control member is in the third working position. 
         [0035]    Preferably, wherein two sets of the first working position, the second working position and the third working position are symmetrically disposed at two sides of the initial position. 
         [0036]    Preferably, wherein the power tool comprises two operation modes comprise an auto mode of operating the control member to lock or release the working attachment, and a manual mode of operating the clamping sleeve to move relative to the chuck body. 
         [0037]    The present invention also provides an operation method for quick locking and releasing working attachment of the power tool, the operation method comprising the following steps: operating the control member to move from the initial position to the working position, and then releasing the control member. 
         [0038]    Preferably, wherein the control member is rotating from the initial position to the working. 
         [0039]    Preferably, wherein the control mechanism comprises a control member operable to select to be in an initial status and a working status, a processor, a detecting circuit, and a driving circuit, wherein the detecting circuit is configured to detect a characteristic indicative of the control member physical state, the processor is configured to transmit a control signal according to a physical state characteristic detected by the detecting circuit, the driving circuit is configured to receive the control signal from the processor and control the motor initiating along a predetermined rotating direction. 
         [0040]    Preferably, wherein the control member is movable disposed relative to the housing and is movable between an initial position corresponding to the initial status and a working position corresponding to the working status, wherein the detecting circuit comprises a first sensor for detecting the position of the control member. 
         [0041]    Preferably, wherein the first sensor comprises at least two hall sensors. 
         [0042]    Preferably, wherein the control mechanism further comprises a second sensor for detecting a characteristic indicative of the motor load, the processor compares the characteristic indicative of the motor load with a predetermined value, and the motor controls switching off when the characteristic indicative of the motor load exceeds to the predetermined value. 
         [0043]    Preferably, wherein control member is configured as a signal switch, wherein when the signal switch is activated, an electric signal is generated and transmitted to the processor, the processor controls the motor initiating in a predetermined rotating direction in response to the electric signal. 
         [0044]    Preferably, wherein the control mechanism further comprises an electromagnetic mechanism matched with the clamping sleeve or the chuck body, wherein the processor controls the electromagnetic mechanism to generate electric current to fix the clamping sleeve or the chuck body relative to the housing after the processor received the electric signal from the signal switch. 
         [0045]    Preferably, wherein the power tool further comprises a reversing member for controlling the rotating direction of the motor and a trigger for switching on/off the motor, the processor controls the motor rotating along the predetermined direction according to the signal indicative of the reversing member, and the processor controls switch on/off the motor according to the signal indicative of the position of the trigger. 
         [0046]    According to the power tool in the present invention, because the foregoing technical solutions are used, an operator only needs to perform a one-button operation, that is, rotates an element of an operation part to quickly lock or release a working attachment, so that the operation is simple and convenient; and because the design of a control mechanism for controlling the working attachment to be quickly locked or released is compact, the power tool has a light and handy body, and is convenient to carry. 
         [0047]    Another technical solution used in the present invention is: A power tool comprising: a housing; a motor disposed in the housing; a main shaft driven by the motor to output rotary power; and a chuck, configured to lock and release a working attachment, the chuck comprises a chuck body coupled with the main shaft, a plurality of jaws movably disposed relative to the chuck body, and a clamping sleeve sleeved outside the chuck body. The clamping sleeve is movable with respect to the chuck body so as to drive the plurality of jaws to retract and open relative to the chuck body, the power tool further includes a control mechanism and a retaining mechanism, the control mechanism comprises a control member that can be operated to move between an initial position and a working position, the control mechanism lock the clamping sleeve or the chuck body with the housing when the control member moves from the initial position to the working position, and then the retaining mechanism retain the control member at the working position. 
         [0048]    According to the power tool in the present invention, because the foregoing technical solution is used, the retaining mechanism can retain the control member at the working position as long as an operator moves the control member to the working position. Another mechanism does not need to be additionally operated manually to retain the control member at the working position, so that locking and releasing operations of the working attachment of the power tool are very convenient. 
         [0049]    Preferably, the control member can rotate relative to the housing between the initial position and the working position, and a rotation axis of the control member is parallel to or is in line with a central axis of the main shaft. 
         [0050]    Preferably, the control mechanism further includes a clutch mechanism disposed between the control member and the clamping sleeve. The clutch mechanism has an engaging status and a separating status, the retaining mechanism alternatively separate from or engage with the clutch mechanism, the control member moves from the initial position to the working position, the clutch mechanism is in the engaging status and is engaged with the retaining mechanism to retain the control member at the working position. 
         [0051]    Preferably, the clutch mechanism includes a first clutch unit fixed relative to the clamping sleeve, and a second clutch unit coupled with the control member, the second clutch unit moves alone the axial direction of the main shaft and alternatively engage with or separate from the first clutch unit, and when the second clutch unit is engaged with the first clutch unit, the retaining mechanism fits the second clutch unit to retain the control member at the working position. 
         [0052]    Preferably, the retaining mechanism includes a retaining member pivotably disposed relative to the control member, and a spring member that makes the retaining member contact with the second clutch unit all the time. 
         [0053]    Preferably, the first clutch unit includes a first engaging member, and the second clutch unit includes a supporting part, and a second engaging member slidably disposed in the supporting part along the axial direction of the main shaft, the second engaging member alternatively engage with or separate from the first engaging member, the second engaging member includes a raised portion that extends outward along a circumferential direction, when the second engaging member is engaged with the first engaging member, the raised portion stops the retaining member, so as to retain the control member at the working position, and when the second engaging member is separated from the first engaging member, the raised portion is away from the retaining member. 
         [0054]    Preferably, the working position includes a first working position for locking the working attachment and a second working position for releasing the working attachment, and there are at least two retaining members, where one retaining member is used to retain the control member at the first working position, and the other retaining member is used to retain the control member at the second working position. 
         [0055]    Preferably, the control mechanism further includes a connecting member that is connected with the control member, the connecting member is rotatable relative to the housing, where a rotation axis of the connecting member is parallel to or is in line with the central axis of the main shaft, and the retaining member is pivotably disposed in the connecting member by using a pivot. 
         [0056]    Preferably, a receiving chamber is disposed on the connecting member, an opening of the receiving chamber is located on an outer circumference surface of the connecting member, and the retaining member is at least partially received in the receiving chamber. 
         [0057]    Preferably, the pivot is disposed in the receiving chamber, the spring member is configured as a torsional spring and is sleeved on the pivot, one end of the torsional spring abuts a side surface of the receiving chamber, and the other end of the torsional spring abuts the retaining member. 
         [0058]    Preferably, an elastic device is disposed between the control member and the housing, the clutch mechanism is separated from the retaining mechanism, and the elastic device is provided with an elastic force for driving the control member to move from the working position to the initial position. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0059]    The present invention is further described in detail below with reference to the accompanying drawings. 
           [0060]      FIG. 1  is a schematic three-dimensional view of a drill according to a first preferred embodiment of the present invention; 
           [0061]      FIG. 2  is a schematic three-dimensional exploded view of housing and a body of the drill shown in  FIG. 1 ; 
           [0062]      FIG. 3  is a sectional view of the drill shown in  FIG. 1  along a front view direction; 
           [0063]      FIG. 4  is a sectional view along an A-A direction in  FIG. 3 ; 
           [0064]      FIG. 5  is a schematic three-dimensional exploded view of the body of the drill shown in  FIG. 2 ; 
           [0065]      FIG. 6  is a schematic three-dimensional exploded view of a second clutch member in  FIG. 5 ; 
           [0066]      FIG. 7  is a sectional view of another clutch mechanism in the drill shown in  FIG. 1 , where the clutch mechanism is separated from a clamping sleeve in this case; 
           [0067]      FIG. 8  is a sectional view of the engagement of the clutch mechanism and the clamping sleeve in  FIG. 7 ; 
           [0068]      FIG. 9  is a schematic three-dimensional view of a connecting member in  FIG. 5 ; 
           [0069]      FIG. 10  is a schematic three-dimensional view of adapting of a connecting member at an initial position and one pair of reversing pushing blocks in  FIG. 5 ; 
           [0070]      FIG. 11  is a schematic three-dimensional view of a reversing button in  FIG. 5 , where a front surface of the reversing button is visible in this case; 
           [0071]      FIG. 12  is a schematic three-dimensional view of the reversing button in  FIG. 5 , where a back surface of the reversing button is visible in this case; 
           [0072]      FIG. 13  is a schematic three-dimensional view of adapting of the connecting member in  FIG. 5  and a reversing pushing block, adapting of the reversing pushing block and the reversing button, and adapting of the reversing button and a reversing switch and a master switch; 
           [0073]      FIG. 14  is a schematic view of an adapting relationship between the reversing button and the reversing switch in  FIG. 13 , where the reversing switch is at a position for forward rotation in this case; 
           [0074]      FIG. 15  is a schematic view of an adapting relationship between the reversing button and the reversing switch in  FIG. 13 , where the reversing switch is at an initial position in this case; 
           [0075]      FIG. 16  is a schematic view of an adapting relationship between the reversing button and the reversing switch in  FIG. 13 , where the reversing switch is at a position for reverse rotation in this case; 
           [0076]      FIG. 17  is a schematic three-dimensional view of adapting of the connecting member at the initial position and a master switch pushing button in  FIG. 5 ; 
           [0077]      FIG. 18  is a schematic three-dimensional view of adapting of the connecting member and the master switch pushing button, adapting of the master switch pushing button and a master switch button, and the master switch button and the master switch in  FIG. 5 ; 
           [0078]      FIG. 19  is a schematic status view when a control mechanism of the drill is located at the initial position according to an embodiment of the present invention; 
           [0079]      FIG. 20  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a first working status; 
           [0080]      FIG. 21  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a second working status; 
           [0081]      FIG. 22  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a third working status; 
           [0082]      FIG. 23  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a fourth working status; 
           [0083]      FIG. 24  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a fifth working status; 
           [0084]      FIG. 25  is a schematic view when the control mechanism of the drill in  FIG. 19  is in a sixth working status; 
           [0085]      FIG. 26  is a view of the control principle of a drill according to a second preferred embodiment of the present invention; 
           [0086]      FIG. 27  is a schematic view of detecting, by the drill in  FIG. 26 , a position of a control member by using a sensor, where the control member is located at an initial position in this case; 
           [0087]      FIG. 28  is similar to  FIG. 27 , where the control member is located at a working position for releasing a drill bit in this case; 
           [0088]      FIG. 29  is similar to  FIG. 27 , where the control member is at a working position for clamping the drill bit in this case; 
           [0089]      FIG. 30  is a flowchart of detecting, by the drill in  FIG. 26 , a position of a rotating sleeve by using the sensor, to control a motor; 
           [0090]      FIG. 31  is a schematic three-dimensional exploded view at the rotating sleeve, a retaining mechanism, a transmission member, and the connecting member in  FIG. 5 ; 
           [0091]      FIG. 32  is a sectional view at the retaining mechanism of the drill according to an embodiment of the present invention, where the rotating sleeve is located at the initial position in this case; 
           [0092]      FIG. 33  is a sectional view at the retaining mechanism of the drill according to an embodiment of the present invention, where the rotating sleeve is located at a middle position between the initial position and the working position in this case; 
           [0093]      FIG. 34  is a sectional view at the retaining mechanism of the drill according to an embodiment of the present invention, where the rotating sleeve is located at the working position in this case. 
       
    
    
     DETAILED DESCRIPTION 
       [0094]    Referring to  FIG. 1  to  FIG. 3 , an embodiment of a power tool of the present invention uses a handheld drill  10 . The drill  10  includes a housing  2  and a body  20 , where the housing  2  is formed by connecting two half shells  2   a . The housing  2  includes a main housing for receiving an electric motor  18 , and handle housing used to form a handle  4 . The main housing and the handle housing cross each other, and in this embodiment, the main housing of the drill  10  and the handle housing are disposed in a substantially perpendicular manner. One end, of the handle  4 , away from the electric motor  18  is provided with a battery pack  8  for providing energy to the motor  18 , and the battery pack  8  is detachably connected with the handle  4 . The body  20  includes the motor  18 , a chuck  3  driven by the motor  18  to rotate, a transmission mechanism  17  disposed between the chuck  3  and the motor  18 , and a control mechanism  60 . The chuck  3  is configured to clamp a working attachment, such as a drill bit, a screwdriver bit, a shovel header, or an adapter; and in this embodiment, a drill bit  5  is used as an example for description. The control mechanism  60  is configured to control the chuck  3  to quickly lock or release the drill bit  5 . The control mechanism  60  includes a control member rotatably disposed relative to the housing  2 . In this embodiment, the control member fits, in a form of a rotating sleeve  6 , a shape of the housing  2 , and is suitable to be rotated and operated manually and moves between an initial position and a working position relative to the housing  2 , and when the control member is located at the working position, the control mechanism  60  activates. A rotation center line of the rotating sleeve  6  is coaxial with a central axis of a main shaft  16 . Certainly, in this embodiment, the rotation center line of the rotating sleeve  6  may also be set to be parallel to the central axis of the main shaft  16 . One end, of the handle  4 , close to the motor  18  is provided with a reversing button  64  for controlling forward and reserve rotation of the motor  18 , and a master switch button  9  used to control the motor  18  to start. 
         [0095]    Referring to  FIG. 3  and  FIG. 4 , a master switch  66  for controlling the motor  18  to rotate and a reversing switch  65  for controlling a rotation direction of the motor  18  are disposed in the housing  2 . The reversing switch  65  is provided with a toggle  65   a , and the master switch button  9  is disposed at one side, of the handle  4 , close to the chuck  3 , and is convenient to operate and control. Certainly, in this embodiment, the master switch  66  and the reversing switch  65  may be integrated to one switch, and the reversing button  64  and the master switch button  9  (or a trigger) are activated to implement forward and reserve rotation settings of the motor  18  and starting of the motor  18 . The battery pack  8  is provided with a rechargeable battery  8   a , and in this embodiment of the present invention, a battery uses a lithium battery, and certainly may also use a lead battery, a nickel-cadmium battery, or another replacement. Rotary power of the motor  18  is transmitted to main shaft  16  by using the transmission mechanism  17 . The transmission mechanism  17  is received in a transmission mechanism housing  17   a . The chuck  3  includes: a chuck body  12  coupled with the main shaft  16 , a plurality of jaws  14  movably disposed relative to the chuck body  12 , and a clamping sleeve  13  sleeved outside the chuck body  12  and in thread engagement with the plurality of jaws  14 . The drill bit  5  can be locked in the jaws  14  in a releasable manner, and in this embodiment of the present invention, there are three jaws  14 . The main shaft  16  may be directly or indirectly connected with the chuck body  12 . When the main shaft  16  drives the chuck body  12  to rotate, the jaws  14  produce displacement relative to the clamping sleeve  13  along an axial direction of the main shaft  16  as long as a position of the clamping sleeve  13  is fixed relative to the housing  2 , so as to make the chuck  3  lock or release the drill bit  5  by using the jaws  14 . A person skilled in the art may easily figure out according to the prior art that, relative movement of the chuck body and the clamping sleeve can make the jaws produce displacement along the axial direction of the main shaft; therefore, if the chuck body is fixed relative to a position of the housing, when the main shaft drives the clamping sleeve to rotate, the chuck may also be made to lock or release the drill bit by using the jaws. In the present invention, the control mechanism  60  can be operated to lock the clamping sleeve  13  or the chuck body  12  with the housing  2 , and control the motor  18  to start in a preset rotation direction, so that the clamping sleeve  13  and the chuck body  13  move relatively, and the chuck  3  locks or releases the drill bit. 
         [0096]    The control mechanism  60  further includes a connecting member  6   a  connected with the rotating sleeve  6  and located in the housing  2  and extending along the axial direction of the main shaft, and a transmission member  6   b  connected with the connecting member  6   a  and located at an inner side of the connecting member  6   a . The rotating sleeve  6 , the connecting member  6   a , and the transmission member  6   b  are fixed relatively or may be integrally molded. A clutch mechanism  30  is disposed between the transmission member  6   b  and the clamping sleeve  13 , and the clutch mechanism  30  has an engaging status and a separating status. An arc support  21  is disposed at a position, on the housing  2 , close to the master switch button  9 , a spring member is supported in a groove of the arc support  21 , and in this embodiment, the spring member is configured as a compression spring  22 . One pair of bumps  25  that are spaced from each other and are located at a position of the connecting member  6   a  that face the arc support  21 . When the rotating sleeve  6  is located at the initial position, the compression spring  22  is located between the two bumps  25  and two ends of the compression spring  22  abut the bumps  25 . When the rotating sleeve  6  is rotated and the rotating sleeve  6  drives the connecting member  6   a  to rotate towards one side, at least one bump  25  of the two bumps  25  abuts the compression spring  22  and make the compression spring  22  compressed. Once the rotating sleeve  6  is released, under an applied force of the compression spring  22 , the rotating sleeve  6  automatically reversely rotates to the initial position, that is, the compression spring  22  provides an elastic force to make the rotating sleeve  6  return from the working position to the initial position. In this embodiment, the spring member is not limited to using the compression spring  22 , and a person skilled in the art may use another elastic device for replacement, as long as an elastic returning force can be provided when the rotating sleeve  6  can be made to return from the working position to the initial position. 
         [0097]    Referring to  FIG. 5 , one end, of the rotating sleeve  6 , away from the chuck  3  are provided with spline teeth  11 , and one end, of the connecting member  6   a , close to the rotating sleeve  6  is provided with a keyway  15 . The rotating sleeve  6  and the connecting member  6   a  tightly adapt by using the spline teeth  11  and the keyway  15 . The connecting member  6   a  and the transmission member  6   b  are both configured as ring members. Spline teeth  19  are disposed on an inside wall of the connecting member  6   a , and correspondingly, a keyway  29  is disposed on an outside surface of the transmission member  6   b , and the transmission member  6   b  is connected with the interior of the connecting member  6   a  in a relatively fixed manner by means of fitting between the keyway  29  and the spline teeth  19 . When the rotating sleeve  6  rotates relative to the housing  2 , the connecting member  6   a  and the transmission member  6   b  are driven to rotate. The clutch mechanism  30  includes a first clutch member  24  fixedly disposed relative to the clamping sleeve  13  and a second clutch member  28  that adapts to the control member, where the second clutch member  28  moves along the axial direction of the main shaft  16  and alternatively engage with or separate from the first clutch member  24 . In this embodiment, the first clutch member  24  is fixedly connected with the clamping sleeve  13 , and in another optional solution, the first clutch member  24  and the clamping sleeve  13  may be integrally molded, and the second clutch member  28  is configured as a ring member. A plurality of first cam surfaces  31  is formed on a side end surface, of the transmission member  6   b , towards the second clutch member  28 , and a plurality of second cam surfaces  32  are correspondingly formed on a side end surface, of the second clutch member  28 , towards the transmission member  6   b . The first cam surfaces  31  and the second cam surfaces  32  form a cam mechanism disposed between the transmission member  6   b  and the second clutch member  28 . When the rotating sleeve  6  is located at the initial position, the first cam surfaces  31  and the second cam surfaces  32  are mutually staggered, that is, concave-convex meshing. When the rotating sleeve  6  is rotated, the first cam surfaces  31  are driven to rotate to mutually abut the second cam surfaces  32 , that is, concave-convex separating or convex-convex abutting, to make the second clutch member  28  produce displacement towards a direction of the clamping sleeve  6  along the axial direction of the main shaft, so that the second clutch member  28  can be engaged with or separated from the first clutch member  24 . In short, when the rotating sleeve  6  moves from the initial position to the working position, the clutch mechanism  30  can be controlled to switch from the separating status to the engaging status, so that the clamping sleeve  13  is locked relative to the housing  2 . When the rotating sleeve  6  returns from the working position to the initial position, the clutch mechanism  30  is switched from the engaging status to the separating status, so that the clamping sleeve  13  is unlocked relative to the housing  2 . 
         [0098]    One end, of the transmission mechanism housing  17   a , close to the second clutch member  28  is provided with a spline part  27 , and a keyway  26  is disposed on an inside wall of the second clutch member  28 . By means of fitting between the keyway  26  and the spline part  27 , the second clutch member  28  is sleeved on the transmission mechanism housing  17   a  and can move relative to the transmission mechanism housing  17   a  along the axial direction of the main shaft. A baffle  40  is disposed between the second clutch member  28  and the first clutch member  24 , a plurality of notches  42  is disposed at an edge along a circumferential direction of the baffle  40 , and the baffle  40  is connected with the spline part  27  by using a fastening member, so that axial movement of the second clutch member  28  relative to the spline part  27  is restricted, and the fastening member in this embodiment uses a screw  41 . A spring member is disposed between the second clutch member  28  and the baffle  40 . In this embodiment, the spring member uses a compression spring  45 . Several concave holes  44  are disposed along a circumferential direction on a side end surface, of the second clutch member  28 , close to the baffle  40 , and several compression springs  45  are correspondingly disposed in the concave holes  44 . One end of the compression spring  45  abuts the second clutch member  28 , and the other end abuts the baffle  40 ; in this way, when the rotating sleeve  6  returns, the spring member makes the second clutch member  28  return, that is, the rotating sleeve  6  returns from the working position to the initial position, and the clutch mechanism  30  is switched from the engaging status to the separating status, so that the clamping sleeve  13  is unlocked relative to the housing  2 . 
         [0099]    The control mechanism  60  further includes one pair of reversing pushing blocks  62  that can alternatively adapt to the connecting member  6   a , a reversing button  64  that slidably adapts to the reversing pushing block  62 , and a master switch pushing button  68  that can selectively adapt to the connecting member  6   a  and that is used to activate the master switch  66 . A spring member is disposed between the reversing pushing block  62  and the transmission mechanism  17 , and in this embodiment of the present invention, a returning spring  48  is used. 
         [0100]    Referring to  FIG. 6 , the second clutch member  28  includes a supporting part  28   a  and a cam part  28   b , where the supporting part  28   a  and the cam part  28   b  are fastened together by using a screw  33 . The second cam surface  32  is disposed on the cam part  28   b , and is located on a side end surface opposite to the supporting part  28   a . The second clutch member  28  includes a second engaging member. In this embodiment, several restricting holes  35  are disposed along a circumferential direction on a side end surface, of the supporting part  28   a , opposite to the cam part  28   b . Several compression springs  37  correspond to the restricting holes  35  and are completely received in the restricting holes  35 . Several blocking pins  36  correspond to the restricting holes  35  and the blocking pins  36  are partially supported in the restricting holes  35 . Tip portions, of the blocking pins  36 , exposed of the restricting holes  35  can penetrate out of the notches  42  of the baffle  40  and can be selectively engaged with the first engaging member of the first clutch member  24 . One end of the compression spring  37  abuts the cam part  28   b , and the other end abuts the blocking pin  36 , so that the blocking pin  36  can overcome an applied force of the compression spring  37  under stress and performs axial movement relative to the supporting part  28   a . The blocking pin  36  as the second engaging member can be selectively engaged with or separated from the first engaging member of the first clutch member  24 . In this embodiment, the first engaging member is configured as a ring gear  43  disposed on a side end surface, of the clamping sleeve  13 , close to the second clutch member  28  (referring to  FIG. 5 ). When the first engaging member is engaged with the second engaging member, that is, the tip portion of the blocking pin  36  is engaged with the ring gear  43 , the clamping sleeve  13  is locked relative to the housing  2 , and when the first engaging member is separated from the second engaging member, the clamping sleeve  13  can be rotated relative to the housing  2 . 
         [0101]    The clutch mechanism is not limited to the foregoing structure and form, and  FIG. 7  and  FIG. 8  show another clutch mechanism  30   a  in this embodiment. The clutch mechanism  30   a  includes a first clutch member connected with the clamping sleeve  13 , and a clutch assembly that adapts to the rotating sleeve  6 . The first clutch member is configured as a ring gear  43   a  that is connected with the clamping sleeve  13  and whose inner circumference surface is provided with inner teeth. The clutch assembly includes an engaging member  53  and a clutch member  54 . An outer circumference surface of the engaging member  53  is provided with outer teeth  531  that can be engaged with the ring gear  43   a . An end surface, of the engaging member  53 , opposite to the clutch member  54  is provided with first clutch teeth, and correspondingly, an end surface of the clutch member  54  is provided with second clutch teeth that fit the first clutch teeth. The clutch member  54  is fixed on the transmission mechanism housing  17   a  along a circumferential direction of the main shaft. A returning spring is disposed between the clutch member  54  and the engaging member  53 . The rotating sleeve  6  rotates to drive the clutch member  54  to move along the axial direction of the main shaft to make the first clutch teeth engaged with the second clutch teeth, and then, the clutch member  54  drives the engaging member  53  to move along the axial direction of the main shaft to make the outer teeth  531  engaged with the ring gear  43   a ; in this way, the rotation of the clamping sleeve  13  relative to the housing  2  along the circumferential direction is locked. In this way, when the rotating sleeve  6  returns, the returning spring makes the clutch member  54  return, and makes the first clutch teeth separated from the second clutch teeth, and regardless of whether the outer teeth  531  is engaged with the ring gear  43   a , the rotation of the clamping sleeve  13  is not limited. A manner in which the rotating sleeve  6  drives the clutch member  54  to move along the axial direction is the same as that in the foregoing structure, and details are not described herein again. 
         [0102]    Referring to  FIG. 9  and  FIG. 10 , one pair of first slopes  70  and one pair of second slopes  72  are disposed on an outside surface of the connecting member  6   a . The first slopes  70  are symmetrically distributed at two sides of a center line of the main shaft  16 . A first straight plane  71  is connected between the first slopes  70 . The second slopes  72  are also symmetrically distributed at the two sides of the center line of the main shaft  16 . A second straight plane  73  is connected between the second slopes  72 . The first straight plane  71  is substantially parallel to the second straight plane  73 . Extension directions of the first slope  70  and the second slope  72  are substantially the same. One pair of reversing pushing blocks  62  are symmetrically distributed at two sides of the main shaft  16 , the reversing pushing blocks  62  are separately provided with a first inclined plane  62   a  used to slidably adapt to the second slope  72 , and a second inclined plane  62   b  used to slidably adapt to the reversing button  64 . When the rotating sleeve  6  is rotated towards a direction, the second slope  72  of the connecting member  6   a  abuts a corresponding first inclined plane  62   a  and makes the reversing pushing block  62  move along the axial direction, shown by an arrow M 1 , of the main shaft  16 . When the rotating sleeve  6  is released, at the same time the rotating sleeve  6  rotates and returns, the reversing pushing block  62  can automatically return to the initial position under the action of the returning spring  48 . 
         [0103]    Referring to  FIG. 11  to  FIG. 13 , the reversing button  64  includes a reversing portion  64   a , and function portions  64   b  located at two sides of the reversing portion  64   a . A side surface of each of the function portions  64   b  is provided with a reversing slope  64   c . The reversing slope  64   c  is separately used to slidably adapt to a second inclined plane  62   b  of a corresponding reversing pushing block  62 . One side, of the reversing portion  64   a , opposite to the reversing slope  64   c  is provided with a waist-shaped groove  67 , used to receive the toggle  65   a  of the reversing switch  65  (referring to  FIG. 3 ). When the reversing pushing block  62  produces displacement along the axial direction, shown by the arrow M 1 , of the main shaft  16 , under the action of the reversing pushing block  62 , the reversing button  64  moves along a direction perpendicular to the axial direction of the main shaft  16 , that is, moves along a direction shown by an arrow M 2  or an arrow M 2 ′. 
         [0104]    Referring to  FIG. 14  to  FIG. 16 , the toggle  65   a  is pivotably disposed on the reversing switch  65 . When the reversing button  64  moves along the direction shown by the arrow M 2 , the toggle  65   a  received in the waist-shaped groove  67  is pivoted to the first working position, that is, pivoted to a position for controlling forward rotation of the motor  18 . When the reversing button  64  moves along a direction opposite to the arrow M 2 , that is, moves along the direction shown by the arrow M 2 ′, the toggle  65   a  received in the waist-shaped groove  67  is pivoted to the second working position, that is, pivoted to a position for controlling reverse rotation of the motor  18 . When the reversing button  64  is located between the first working position and the second working position, that is, the toggle  65   a  is located at the initial position, the master switch  66  cannot be activated. The master switch  66  can be activated only when the toggle  65   a  of the reversing switch  65  moves to the first or second working position, and the motor  18  performs forward rotation or reverse position. As can be seen from the above, by means of interaction between the connecting member  6   a  and the reversing pushing block  62 , reversing button  64  can be driven to move along a preset direction by rotating the rotating sleeve  6  to the working position. The reversing button  64  drives the toggle  65   a  to control a rotation direction of the motor  18 , that is, the connecting member  6   a , the reversing pushing block  62 , and the reversing button  64  forms a first transmission mechanism from the rotating sleeve  6  to the toggle  65   a  or from the rotating sleeve  6  to the reversing switch  65 , and the toggle  65   a  or the reversing switch  65  forms a reversing member in this embodiment. When the rotating sleeve  6  moves from the initial position to the working position, the reversing member can be activated by using the first transmission mechanism. 
         [0105]    Referring to  FIG. 17  and  FIG. 18 , the master switch pushing button  68  is provided with one pair of pushing button slopes  68   a , which can separately slidably adapt to the first slopes  70  correspondingly. When the rotating sleeve  6  is located at the initial position, the master switch pushing button  68  abuts the first straight plane  71  located between the first slopes  70 . When the rotating sleeve  6  drives the connecting member  6   a  to rotate towards one side relative to the housing  2  by using an axis of the main shaft  16  as a rotation center line, the pushing button slope  68   a  slidably adapts to a corresponding first slope  70 , to make the master switch pushing button  68  to move along the axial direction, shown by the arrow M 1 , of the main shaft  16 . The master switch pushing button  68  is provided with a contact foot  68   b  that extends towards a direction of the master switch  66 . The contact foot  68   b  adapts to the master switch button  9 , so that the master switch pushing button  68  and the master switch button  9  are disposed in a linked manner. When the master switch pushing button  8  moves along the direction shown by the arrow M 1 , the master switch button  9  is driven to move together to activate the master switch  66 . As can be seen from the above, by means of interaction between the connecting member  6   a  and the master switch pushing button  68 , the master switch pushing button  68  can be driven to move by rotating the rotating sleeve  6  to the working position, that is, the connecting member  6   a  and the master switch pushing button  68  form a second transmission mechanism from the rotating sleeve  6  to the master switch  66 , and when the rotating sleeve  6  moves from the initial position to the working position, the master switch  66  can be activated by using the second transmission mechanism, so as to start the motor  18 . In this embodiment of the present invention, the master switch  66  and the reversing switch  65  are integrally disposed, and certainly, a person skilled in the art may perform adjustment according the inner structure of the housing  2 . 
         [0106]    Referring to  FIG. 19  to  FIG. 25 , in order to clearly describe the working principle of the control mechanism  60 , in this embodiment of the present invention, an example in which the control member performs forward rotation towards one side relative to the housing  2  by using the axis of the main shaft  16  as the rotation center line is used for exemplary description, and because a step of performing, by the control member, reverse rotation towards the other side relative to the housing  2  is substantially the same, details are not described again. It should be clear that, in this embodiment, forward and reverse that are mentioned indicate two opposite rotation directions, that is, a first direction and a second direction. When the rotating sleeve  6  rotates towards the first direction, the control mechanism  60  is used to control the chuck  3  clamping a drill bit  5 . When the rotating sleeve  6  rotates towards the second direction, the control mechanism  60  controls the chuck  3  releasing the drill bit  5 . That is, when the rotating sleeve  6  rotates to the working position, the control mechanism activates, and the rotating sleeve  6  has two working positions, which are symmetrically set at two sides of the initial position. A movement relationship among the transmission member  6   b , the clutch mechanism  30 , and the clamping sleeve  13 , a movement relationship between the transmission member  6   b  and the reversing pushing block  62 , a movement relationship between the reversing pushing block  62  and the reversing button  64 , and a movement relationship between the transmission member  6   b  and the master switch pushing button  68  are described in detail below. 
         [0107]    Referring to  FIG. 19 , when the rotating sleeve  6  is located at the initial position (not shown in the figure), the clutch mechanism between the transmission member  6   b  and the clamping sleeve  13  is disengaged, that is, the blocking pin  36  of the second clutch member  28  and the ring gear  43  of the first clutch member  24  are in the separating status. The first cam surface  31  on the transmission member  6   b  and the second cam surface  32  on the second clutch member  28  are located at positions that are mutually staggered. Assuming that when the rotating sleeve  6  is located at the initial position, the reversing switch  65  is exactly located at a position for reverse rotation, that is, the toggle  65   a  of the reversing switch  65  is exactly stopped at the second working position, in  FIG. 19 , a shown reversing switch  65 ′ at the position for reverse rotation is conducted; in this case, the first inclined plane  62   a  of the reversing pushing block  62  exactly abuts a second slope  72  of a corresponding connecting member  6   a , and the second inclined plane  62   b  abuts the reversing slope  64   c  of the reversing button  64 ; and the top of the pushing button slope  68   a  of the master switch pushing button  68  abuts the first straight plane  71 . 
         [0108]    Referring to  FIG. 20 , when the rotating sleeve  6  starts to be rotated towards the first direction (not shown in the figure), the connecting member  6   a  drives the transmission member  6   b  to rotate, and the second cam surface  32  on the second clutch member  28  starts to approach the first cam surface  31  on the transmission member  6   b ; the second clutch member  28  approaches a direction of the first clutch member  24 ; the second inclined plane  62   b  slides on the reversing slope  64   c  of the reversing button  64 , to produce displacement along the axial direction of the main shaft, and also pushes the reversing button  64  to produce displacement in a direction perpendicular to the axis of the main shaft; the reversing switch  65  starts to switch a direction; and the top of the pushing button slope  68   a  of the master switch pushing button  68  starts to slide towards a direction of the first slope  70  on the first straight plane  71 . 
         [0109]    Referring to  FIG. 21 , when the rotating sleeve  6  is rotated to a specific angle, the connecting member  6   a  drives the transmission member  6   b  to rotate by a corresponding angle, and the second cam surface  32  on the second clutch member  28  starts to abut the first cam surface  31  on the transmission member  6   b ; the blocking pin  36  of the second clutch member  28  starts to be engaged with the ring gear  43  of the first clutch member  24 ; the second inclined plane  62   b  slides along the axial direction M 1  of the main shaft to be disengaged with the reversing slope  64   c  of the reversing button  64 , and the reversing button  64  moves towards a direction M 2  perpendicular to the axial direction of the main shaft to completely switch the reversing switch  65 , that is, the reversing switch  65  is conducted at a position for forward rotation; in this case, the top of the pushing button slope  68   a  of the master switch pushing button  68  continues to slide towards the first slope  70  on the first straight plane  71 . 
         [0110]    Referring to  FIG. 22 , the rotating sleeve  6  continues to be rotated, and the second cam surface  32  on the second clutch member  28  abuts the first cam surface  31  on the transmission member  6   b , and pushes the second clutch member  28  to further approach the first clutch member  24 ; the second pushing block inclined plane  62   b  is disengaged with the reversing slope  64   c  of the reversing button  64  and then is bonded with the reversing button  64 , and stops moving; and the top of the pushing button slope  68   a  of the master switch pushing button  68  further moves towards the first slope  70  on the first straight plane  71 . 
         [0111]    Referring to  FIG. 23 , the rotating sleeve  6  is further rotated, and when the second clutch member  28  is pushed by the transmission member  6   b , the second cam surface  32  further abuts the first cam surface  31 , and the blocking pin  36  is completely engaged with the ring gear  43  of the first clutch member  24 . The pushing button slope  68   a  of the master switch pushing button  68  abuts the first slope  70 , and the master switch pushing button  68  starts to be pushed to move along the axial direction M 1  of the main shaft. 
         [0112]    Referring to  FIG. 24 , the rotating sleeve  6  is further rotated to make the rotating sleeve  6  at the first working position, the master switch pushing button  68  moves to a position for switching on the master switch  66 , and power is supplied to make the motor  18  rotate along a forward direction. 
         [0113]    Further referring to  FIG. 25 , when the motor  18  drives the main shaft  16  connected with the chuck  3  to perform forward rotation, because of an engaging function of the clutch mechanism  30 , the clamping sleeve  13  is in a relatively fixed status for the housing  2 , so that the jaws  14  produce displacement, relative to the clamping sleeve  13  on the chuck body  12 , along the axial direction of the main shaft  16 , so as to lock the drill bit  5  in the chuck  3 . Once the drill bit  5  is locked, the jaws  14  do not move relative to the chuck body  12  along the axial direction, while the main shaft  16  still continues to rotate. Because of a counterforce of the clamping sleeve  13 , the blocking pin  36  of the second clutch member  28  compresses the compression spring  37  to retract, so as to be disengaged with the ring gear  43  of the clamping sleeve; in this case, an operator can hear slipping sound of the blocking pin  36  on a surface of the ring gear  43 , and the rotating sleeve  6  can return to the initial position as long as the rotating sleeve  6  is released. In this way, a locking operation on the drill bit  5  is completed by using the control mechanism  60 . 
         [0114]    When the drill bit  5  locked in the chuck  3  needs to be released from the chuck  3 , the control member only needs to be operated reversely, that is, the rotating sleeve  6  is rotated towards the second direction, so that the rotating sleeve  6  is located at the second working position. In a process of rotating the rotating sleeve  6 , the clutch mechanism  30  is engaged, and the clamping sleeve  13  is fixed relative to the housing  2 , the reversing button  64  drives the toggle  65   a  of the reversing switch  65  to the position for reverse rotation, and the master switch pushing button  68  pushes the master switch button  9  to activate the master switch  66 . Once the motor  18  drives the main shaft  16  to perform reverse rotation, the jaws  14  produces, relative to the clamping sleeve  13  on the chuck body  12 , displacement along a direction opposite to that of a clamping operation, so as to release the drill bit  5  from the chuck  3 . 
         [0115]    As can be seen from the above, a first working site, a second working site, and a third working site are included between the initial position and each working position. When the rotating sleeve  6  is located at the initial position, the clutch mechanism  30  is separated, when the rotating sleeve  6  is located at the first working site, the clutch mechanism is engaged to make the clamping sleeve  13  locked relative to the housing  2 , when the rotating sleeve  6  is located at the second working site, the reversing member is activated, and when the rotating sleeve  6  is located at the third working site, the master switch is activated. Because the rotating sleeve  6  has two working positions, there are two corresponding first working sites, second working sites, and third working sites, which are symmetrically set at the two sides of the initial position. Regardless of whether the drill bit  5  is locked in the chuck  3  or the drill bit is released from the chuck  3 , in a process in which the rotating sleeve  6  moves from the initial position to the working position, the control mechanism  60  first needs to lock the clamping sleeve with the housing, activates the reversing member, and finally activates the switch, that is, locking the clamping sleeve and activating the reversing member can be performed simultaneously, that is, the first working site is the same as the second working site, or the clamping sleeve may be first locked and then the reversing member is activated, or the reversing member is first activated and then the clamping sleeve is locked, as long as it is ensured that the clamping sleeve is locked and the reversing member is activated before the master switch is activated, so that an operation on the drill is more safe and reliable. 
         [0116]    An automatic mode in which the control member is operated to lock or release the chuck is described above, and certainly, if an operator does not want to use the automatic mode, the operator can also use a manual mode in which the clamping sleeve is selected to be operated to move relative to the chuck body, as long as the clamping sleeve is set to have a part that is exposed externally and can be operated. 
         [0117]    That the control member is operated to automatically lock or release the drill bit  5  in a mechanical manner is described above, and a specific operation method includes the following steps: operating the rotating sleeve  6  to move from the initial position to the working position; and then releasing the rotating sleeve  6 . An operation of making the rotating sleeve  6  move from the initial position to the working position is rotating. 
         [0118]    That the control member is operated to automatically lock or release the drill bit  5  in a mechanical and electronic manner is described in details below. 
         [0119]      FIG. 26  shows a view of the control principle of a drill in a second preferred embodiment, and the mechanical structure of the drill is the same as that in the first embodiment, but a manner of controlling a motor  18  is an electric manner. Specifically, a control mechanism  60   a  includes a control member for which an initial status or a working status can be operationally selected, a processor  80 , a control member status detecting circuit  81 , and a driving control circuit  82 . The control member status detecting circuit  81  detects a physical status parameter, that is, a position, a switch or electric signal, or the like, of the control member. The processor  80  sends, according to the detected physical status parameter, a control signal corresponding to the physical status parameter. The driving control circuit  82  is used to receive the control signal of the processor  80  and controls the motor  18  to be started along a preset rotation direction, where the preset rotation direction is a rotation direction corresponding to locking or releasing a drill bit. The processor  80  may use an MCU, a PLC, or a CPU; and in this embodiment, the processor  80  is a micro computer control system (MCU). The control par may be still in a form of a rotating sleeve  6 . The rotating sleeve  6  is movably disposed relative to a housing  2 , and can move between an initial position and a working position that respectively correspond to the initial status and the working status, and a position of the rotating sleeve  6  is detected by using sensors. 
         [0120]      FIG. 27  to  FIG. 29  shows schematic views of detecting, by using the sensors, the position of the rotating sleeve.  FIG. 30  shows a flowchart of detecting, by using the sensors, the position of the rotating sleeve to control the motor. The sensors include at least two hall sensors. Using two hall sensors as an example, a first hall sensor  811  and a second hall sensor  812  are installed on a printed circuit board (PCB)  810 , the PCB is installed on a transmission mechanism housing  17   a , a magnetic steel  813  is installed on the rotating sleeve  6 , the rotating sleeve  6  is rotated to control a clamping sleeve  13  to be locked or not relative to the housing  2 , the PCB is powered on, and the two hall sensors detect a position signal of the rotating sleeve  6  by using the magnetic steel. When the rotating sleeve  6  is located at the initial position, neither of the two hall sensors outputs a signal, that is, the two hall sensors are in an OFF status; in this case, the drill can work normally, as shown in  FIG. 27 . When the rotating sleeve  6  is rotated to the working position for releasing, the first hall sensor  811  detects a signal of the magnetic steel  813 , and is in an ON status, and the second hall sensor  812  detects no signal of the magnetic steel  813 , and is in an OFF status; in this case, the processor  80  instructs the driving control circuit  82  to control the motor  18  to rotate along a preset first direction to make a chuck release the drill bit, as shown in  FIG. 28 . When the rotating sleeve  6  is rotated to the working position for locking, the first hall sensor  811  detects no signal of the magnetic steel  813 , and is in an OFF status, and the second hall sensor  812  detects a signal of the magnetic steel  813 , and is in an ON status; in this case, the processor  80  instructs the driving control circuit  82  to control the motor to rotate along a preset second direction opposite to the first direction to make the chuck clamp the drill bit, as shown in  FIG. 28 . 
         [0121]    In this embodiment, an electric clutch manner may also used, that is, the control mechanism  60   a  further includes a sensor used to measure a motor load parameter, where the motor load parameter may be a current that passes through the motor, a voltage of the motor, a rotation speed of the motor, or efficiency of the motor; and the processor performs a comparison operation on the motor load parameter detected by the sensor and a preset value, and when it is detected that the motor load parameter is greater than the preset value, controls the motor to stop. 
         [0122]    In this embodiment, the control member may also be constructed as a signal switch. When the signal switch is activated, an electric signal is generated and transmitted to the processor, and in response to the electric signal, the processor controls the motor to be started along a preset rotation direction. In addition, in this embodiment, the clamping sleeve may be locked in an electric control manner. The control mechanism further includes an electromagnetic mechanism matched with the clamping sleeve or a chuck body. After receiving a signal indicating that the signal switch is switched on, the processor controls the electromagnetic device to be energized to lock the clamping sleeve or the chuck body with the housing. In addition, in the embodiment, a master switch may be not disposed, and only a reversing member for controlling a rotation direction of the motor and a trigger for controlling the motor to start and stop are disposed. The processor controls, according to a position signal of the reversing member, the motor to rotate along a preset direction, and the processor controls, according to a position signal of the trigger, the motor to start and stop. 
         [0123]    An operator only needs to operate an operation part of the control mechanism to lock or release the drill bit  5 , so that an operation is simple and convenient. The clamping sleeve or the chuck body is locked relative to the housing by using the control mechanism, and the motor is controlled to be started along a preset rotation direction, so as to make the clamping sleeve and the chuck body relatively move. In addition, various parts of the control mechanism adapt compactly, so that a power tool is very light and handy, and is convenient to carry. 
         [0124]    Referring to  FIG. 31 , in order to further make an operation convenient, a drill  10  further includes a retaining mechanism. When the rotating sleeve  6  moves to the working position, the control mechanism  60  can lock the clamping sleeve  13  or a chuck body  12  with the housing  2  (referring to  FIG. 2  and  FIG. 3 ), and the retaining mechanism retains the rotating sleeve  6  at the working position. In this way, when the rotating sleeve  6  is operated, the clamping sleeve  13  or the chuck body  12  not only can be locked relative to the housing  2 , but also when the rotating sleeve  6  is rotated to the working position, the retaining mechanism can retain the rotating sleeve  6  at the working position, and the rotating sleeve  6  does not need to be additionally manually retained at the working position; therefore, an operation on the drill of the present invention is more convenient. 
         [0125]    Further, the rotating sleeve  6  may be further operated to control the rotation direction of the motor. In this way, when the rotating sleeve  6  is operated, the clamping sleeve  13  or the chuck body  12  are made to be locked relative to the housing  2  and the rotation direction of the motor is controlled, the rotating sleeve  6  is retained at the working position, and a working attachment can be locked or released by starting the motor. 
         [0126]    Referring to  FIG. 11  to  FIG. 13 , in this preferred embodiment, specifically, the power tool further includes a reversing button  64  for controlling the rotation direction of the motor. The reversing button  64  can move between a start position and a reversing position. The control mechanism  60  further includes a first transmission mechanism connected between the rotating sleeve  6  and the reversing button  64 . The rotating sleeve  6  moves from the initial position to the working position, and can make, by using the first transmission mechanism, the reversing button  64  move from the start position to the reversing position. Therefore, the rotation direction of the motor is controlled. How the rotating sleeve  6  makes, by using the first transmission mechanism, the reversing button  64  move is described in detail above, and details are not described herein again. 
         [0127]    In order to further improve operation convenience of the drill, the rotating sleeve  6  may be further operated to control the motor to start and stop. 
         [0128]    Referring to  FIG. 11  to  FIG. 13 , specifically, the power tool further includes a master switch  66  for controlling the motor to start and stop, and the control mechanism  60  further includes a second transmission mechanism connected between the rotating sleeve  6  and the master switch  66 . The rotating sleeve  6  moves from the initial position to the working position to activate the master switch  66  by using the second transmission mechanism. Similarly, how the rotating sleeve  6  activates the master switch by using the second transmission mechanism is described in detail above, and details are not described herein again. 
         [0129]    In this embodiment, the rotating sleeve  6  can be operated to control the motor to rotate along a preset direction, that is, the rotating sleeve  6  can be operated to not only control the rotation direction of the motor, bus also control the motor to start and stop, so that an operation on the drill is more convenient. 
         [0130]    Certainly, the reversing button  64  and the switch  66  may also be disposed separately. The rotating sleeve  6  does not control the reversing button  64  and the switch  66 , and is only used to control the clamping sleeve  13  or the chuck body  12  to lock the clamping sleeve  13  or the chuck body  12  with the housing  2 . 
         [0131]    Referring to  FIG. 6  and  FIG. 31 , a clutch mechanism  30  has an engaging status and a separating status. The retaining mechanism can be selectively separated from or engaged with the clutch mechanism  30 . The rotating sleeve  6  moves from the initial position to the working position. The clutch mechanism  30  is in the engaging status to make the clamping sleeve  13  locked relative to the housing  2 , and the clutch mechanism  30  and the retaining mechanism are engaged to retain the rotating sleeve  6  at the working position. 
         [0132]    Referring to  FIG. 5  and  FIG. 31 , in this preferred embodiment, specifically, as described above, the clutch mechanism  30  includes a first clutch member  24  that is fixedly disposed relative to a clamping sleeve  13 , and a second clutch member  28  connected with the rotating sleeve  6 . The second clutch member  28  can be selectively engaged with or separated from the first clutch member  24  along an axial direction of a main shaft. When the second clutch member  28  is engaged with the first clutch member  24 , the retaining mechanism fits the second clutch member  28  to retain the rotating sleeve  6  at the working position. 
         [0133]    An elastic device  22  (referring to  FIG. 5 ) is disposed between the rotating sleeve  6  and the housing  2 , the clutch mechanism is separated from the retaining mechanism, and the elastic device  22  provides an elastic force to make the rotating sleeve  6  return from the working position to the initial position. Preferably, the elastic device  22  is set to be a compression spring, and certainly, may also be a torsional spring or a tension spring. 
         [0134]    Referring to  FIG. 31 , further, the retaining mechanism includes a retaining member  92  pivotably disposed relative to the rotating sleeve  6 , and a spring member  94  that makes the retaining member  92  contact with the second clutch member  28  all the time. In this preferred embodiment, the retaining member  92  is pivotably disposed on a connecting member  6   a , and the spring member  94  are disposed between the rotating sleeve  6  and the retaining member  92 . 
         [0135]    The second engaging member includes a raised portion  96  that extends outward along a radial direction, when the second engaging member is engaged with the first engaging member, the raised portion  96  stops the retaining member  92 , so as to retain the rotating sleeve  6  at the working position, and when the second engaging member is separated from the first engaging member, the raised portion  96  is away from the retaining member  92 . Finally, the rotating sleeve  6  returns from the working position to the initial position under the action of the elastic device  22 . 
         [0136]    In this preferred embodiment, the retaining member  92  is pivotably disposed in the connecting member  6   a . Specifically, a receiving chamber  98  is disposed on the connecting member  6   a , an opening of the receiving chamber  98  is located on an outer circumference surface of the connecting member  6   a , and the retaining member  92  is at least partially received in the receiving chamber  98 . 
         [0137]    Further, the retaining member  92  is pivotably disposed by using a pivot  100 , the pivot  100  is disposed in the receiving chamber  98 , the spring member  94  that makes the retaining member  92  contact with the second clutch member  28  all the time is set to be a torsional spring, the torsional spring is disposed on the pivot  100 , one end of the torsional spring abuts a side surface of the receiving chamber  98 , and the other end of the torsional spring abuts the retaining member  92 . 
         [0138]    The working position of the rotating sleeve  6  includes a first working position and a second working position. When at the first working position, the working attachment is locked. When at the second working position, the working attachment is released. Correspondingly, there are at least two retaining members  92 , where one retaining member  92  is used to retain the rotating sleeve  6  at the first working position, and the other retaining member is used to retain the rotating sleeve  6  at the second working position. 
         [0139]    Specifically, the rotating sleeve  6  has a first rotation direction and a second rotation direction opposite to the first rotation direction. One retaining member  92  extends from a pivot axis of the retaining member  92  to a direction opposite to the first rotation direction of the rotating sleeve  6 , and the other retaining member  92  extends from a pivot axis of the retaining member  92  to a direction opposite to the second rotation direction of the rotating sleeve  6 . Therefore, when the rotating sleeve  6  rotates towards the two opposite rotation directions to the first working position and the second working position respectively, the two retaining members  92  can respectively retain the rotating sleeve  6  at the first working position and the second working position. 
         [0140]    Preferably, four retaining members  92  are set, where two retaining members  92  extend from pivot axes of the retaining members  92  to the direction opposite to the first rotation direction of the rotating sleeve  6 , and the other two retaining members  92  extend from pivot axes of the retaining members  92  to the direction opposite to the second rotation direction of the rotating sleeve  6 . Certainly, the retaining member  92  may also be set to another form. 
         [0141]    Referring to  FIG. 32  to  FIG. 34 , in order to clearly describe that the retaining mechanism retains the rotating sleeve  6  at the working position, in this embodiment of the present invention, an example in which the rotating sleeve  6  rotates relative to the housing  2  towards the first rotation direction by using an axis of the main shaft as a rotation center line is used for exemplary description. Because a step of rotating, by the rotating sleeve  6 , relative to the housing  2  towards the second rotation direction opposite to the first rotation direction is substantially the same, details are not described again. 
         [0142]    Referring to  FIG. 32 , when the rotating sleeve  6  is located at the initial position (not shown in the figure), the retaining member  92  and the raised portion  96  on the second engaging member are separated, and the clutch mechanism  30  between the transmission member  6   b  and the clamping sleeve  13  (referring to  FIG. 5 ) is disengaged. 
         [0143]    Referring to  FIG. 33 , when the rotating sleeve  6  starts to be rotated towards the first rotation direction (not shown in the figure), the connecting member  6   a  is driven to rotate, so as to drive the retaining member  92  to rotate relative to the second clutch member  28  along a circumferential direction. When the retaining member  92  moves to the raised portion  96  of the second engaging member, the retaining member  92  is pushed by the raised portion  96  and overcome an applied force of the spring member  94  to rotate counterclockwise around the pivot  100 . 
         [0144]    Further referring to  FIG. 34 , when the rotating sleeve  6  continues to be rotated towards the first rotation direction, the connecting member  6   a  drives the retaining member  92  to rotate relative to the second clutch member  28  along the circumferential direction. When the retaining member  92  crosses the raised portion  96 , the retaining member  92  rotates clockwise around the pivot  100  under the action of the spring member  94 , so that the retaining member  92  is stopped by the raised portion  96 , so as to retain the rotating sleeve  6  at the working position. 
         [0145]    After a rotation torque of the main shaft reaches a specific value, the drill bit is locked or released, and the first engaging member is separated from the second engaging member, so that the raised portion  96  of the second engaging member is away from the retaining member  92 , and finally, the rotating sleeve  6  returns from the working position to the initial position under the action of the elastic device  22 . 
         [0146]    The present invention is not limited to the foregoing embodiments, and a person skilled in the art can further make other replacements in the revelation of the technical essence of the present invention, and implemented functions that are the same as or similar to those in the present invention shall fall within the protection scope of the present invention. 
         [0147]    The present invention is not limited to the foregoing embodiments, and a person skilled in the art can further make other replacements in the revelation of the technical essence of the present invention, and implemented functions that are the same as or similar to those in the present invention shall fall within the protection scope of the present invention.