board screwdriver

Abstract

The present invention provides a plate screwdriver that is compact in the front-to-back direction and has a more elaborate design. The screwdriver (1) includes: a motor (15) having a stator (16) and a rotor (17) with a rotating shaft (18) extending forward and upward; a switch (45); a pinion; a clutch that works with the help of the pinion; a bit holder that can move forward and backward on the front side of the clutch; a gear housing that accommodates the pinion and the clutch and is divided into two in the front-to-back direction; a motor housing that is connected to the gear housing and accommodates the motor; and a resin grip that is connected to the motor housing and accommodates the switch, forming the following structure: when the bit holder is at the rear side, the clutch becomes connected, so that the rotation of the rotor is transmitted to the bit holder, and when the bit holder is at the front side, the clutch becomes disconnected, so that the rotation of the rotor is not transmitted to the bit holder.

Description

Technical Field

[0001] The present invention relates to a board screwdriver for use in screw fastening operations on gypsum boards. Background Art

[0002] As disclosed in Patent Document 1, a panel screwdriver comprises a motor, a clutch located in front of the motor, and a bit holder (spindle) located in front of the clutch so as to be movable forward and backward. The bit holder is forced toward a forward position, disengaging the clutch. When the bit holder is retracted, the motor's rotation is transmitted to the spindle via the clutch, allowing the bit to be used to tighten screws on the plasterboard.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2015-58517 Summary of the Invention

[0006] Regarding the invention of Patent Document 1, the motor is arranged with the pinion gear provided on the rotating shaft facing forward, so the total length in the front-back direction becomes long, thereby hindering compactness. Therefore, a further improved panel screwdriver is sought without hindering compactness.

[0007] An object of the present invention is to provide a plate screwdriver which is compact in the front-rear direction and capable of arranging gears with predetermined accuracy.

[0008] Another object of the present invention is to provide a plate screwdriver that is compact in the front-rear direction and improves the sealing performance of a gear housing.

[0009] To achieve the above-mentioned object, the first invention of the present invention relates to a panel screwdriver, characterized in that the panel screwdriver includes: a motor having a stator and a rotor rotatable relative to the stator and having a rotor shaft extending at least in the vertical direction; a switch for rotating the rotor; a pinion rotated by means of the rotor shaft; a clutch to which the rotation is transmitted by means of the pinion; a bit holding portion arranged on the front side of the clutch and movable forward and backward; a gear housing that houses the pinion and the clutch, at least a portion of which is made of metal; a resin motor housing connected to the gear housing and housing the motor; and a resin grip portion connected to the motor housing and housing the switch, wherein when the bit holding portion is at the rear side, the clutch is turned on, so that the rotation of the rotor is transmitted to the bit holding portion, and when the bit holding portion is at the front side, the clutch is turned off, so that the rotation of the rotor is not transmitted to the bit holding portion.

[0010] Another aspect of the first invention is characterized in that, in addition to the above-mentioned configuration, the gear housing holds a bearing that supports the pinion gear, and at least a portion holding the bearing is made of metal.

[0011] Another aspect of the first invention is characterized in that, in addition to the above-described configuration, the gear housing is divided into two in the front-rear direction.

[0012] Another aspect of the first invention is characterized in that, in addition to the above-described configuration, a seal member is interposed between a front portion and a rear portion of the gear housing that is divided into two.

[0013] Another aspect of the first invention is characterized in that, in addition to the above-described configuration, a front portion of the gear housing divided into two is made of metal, and a rear portion is made of resin.

[0014] Another aspect of the first invention is characterized in that, in addition to the above-described configuration, the front side portion and the rear side portion of the gear housing divided into two are fastened together with screws.

[0015] Another aspect of the first invention is characterized in that, in addition to the above configuration, the motor housing includes a pair of half-split housings divided into two in the left-right direction, and at least a portion of the gear housing is sandwiched between the half-split housings.

[0016] Another aspect of the first invention is characterized in that, in addition to the above-described configuration, the motor is housed in the motor housing in an inclined posture with the rotor shaft extending forward and upward.

[0017] Another aspect of the first invention is characterized in that, in addition to the above configuration, the gear housing is disposed above the motor housing, and the pinion provided on the upper end of the rotor shaft protrudes into the gear housing.

[0018] Another aspect of the first invention is characterized in that, in addition to the above configuration, the pinion gear transmits rotation to an intermediate shaft extending in the front-rear direction, and the intermediate shaft transmits rotation to the clutch, and the intermediate shaft is held by the gear housing.

[0019] Another aspect of the first invention is characterized in that, in addition to the above configuration, the rotor shaft extends in the vertical direction, the rotor shaft transmits rotation to an intermediate shaft extending in the vertical direction, and the rotor shaft and the intermediate shaft are held by the gear housing.

[0020] In order to achieve the above-mentioned purpose, the second invention of the present invention relates to a plate screwdriver, characterized in that the plate screwdriver includes: a motor having a stator and a rotor that can rotate relative to the stator and whose rotor shaft extends at least in the vertical direction; a switch for rotating the rotor; a pinion that rotates via the rotor shaft; a clutch that transmits rotation via the pinion; a bit holding portion that is arranged on the front side of the clutch and can move forward and backward; a gear housing that accommodates the pinion and the clutch and is divided into two in the front-to-back direction; a motor housing that is connected to the gear housing and accommodates the motor; and a resin grip that is connected to the motor housing and accommodates the switch, when the bit holding portion is at the rear side, the clutch becomes connected, so that the rotation of the rotor is transmitted to the bit holding portion, and when the bit holding portion is at the front side, the clutch becomes disconnected, so that the rotation of the rotor is not transmitted to the bit holding portion.

[0021] Another aspect of the second invention is characterized in that, in addition to the above-described configuration, a seal member is interposed between the front portion and the rear portion of the gear housing that is divided into two.

[0022] Another aspect of the second invention is characterized in that, in addition to the above-described configuration, a front portion of the gear housing divided into two is made of metal, and a rear portion is made of resin.

[0023] Another aspect of the second invention is characterized in that, in addition to the above-described configuration, the front side portion and the rear side portion of the gear housing divided into two are fastened together with screws.

[0024] Another aspect of the second invention is characterized in that, in addition to the above configuration, the motor housing includes a pair of half-split housings divided into two in the left-right direction, and at least a portion of the gear housing is held between the half-split housings.

[0025] Another aspect of the second invention is characterized in that, in addition to the above-described configuration, the motor is housed in the motor housing in an inclined posture with the rotor shaft extending forward and upward.

[0026] Another aspect of the second invention is characterized in that, in addition to the above configuration, the gear housing is disposed above the motor housing, and the pinion provided on the upper end of the rotor shaft protrudes into the gear housing.

[0027] Another scheme of the second invention is characterized in that, based on the above structure, the pinion is used to transmit rotation to an intermediate shaft extending in the front-to-back direction, and the intermediate shaft is used to transmit rotation toward the clutch, and the intermediate shaft is held by the front and rear parts of the gear housing divided into two.

[0028] According to the first invention, the total length in the front-rear direction is shortened and the device becomes compact. In addition, the gears can be arranged with predetermined accuracy.

[0029] According to the second invention, the total length in the front-back direction is shortened and the gear housing is made compact. In addition, since the gear housing is divided into the front and back parts, the sealing performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a perspective view of an automatic loading screwdriver.

[0031] Figure 2 It is a side view of a self-loading screwdriver.

[0032] Figure 3 A top view of a self-loading screwdriver.

[0033] Figure 4 yes Figure 3 A-A line cross-sectional view.

[0034] Figure 5 This is an exploded perspective view of the gear housing and clutch.

[0035] Figure 6 This is a perspective view omitting the left half-split housing and the main housing of the motor.

[0036] Figure 7 This is an exploded perspective view of the switch panel.

[0037] Figure 8 yes Figure 3 Enlarged cross-sectional view of line B-B.

[0038] Description of Reference Numerals

[0039] 1…Automatic loading screwdriver; 2…Main housing; 3…Gear housing; 4…Casing; 5…Clutch; 9…Motor housing; 10…Handle housing; 11…Handle portion; 15…Motor; 18…Rotating shaft; 32…Pinion; 45…Switch; 50…Battery mounting portion; 53…Controller; 54…Control circuit board; 70…Intermediate shaft; 71…First main shaft; 72…Clutch cam; 73…Coil spring; 74…Second main shaft; 75…Tool bit holding portion; 90…Push drive mechanism portion; 91…Rod; 92…Operating lever; 93…Sensor board; 301…Front gear housing; 302…Rear gear housing; 310…Seal ring. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0041] Figure 1A perspective view showing an automatic loading screwdriver as an example of a plate screwdriver. Figure 2 Shows its side view, Figure 3 Indicates its top view.

[0042] An automatic loading screwdriver (hereinafter referred to as simply "screwdriver") 1 includes a main body housing 2. A cylindrical gear housing 3 is assembled on the front side of the main body housing 2. A cylindrical shell 4 extending forward is mounted on the front side of the gear housing 3. A clutch 5 is provided inside the gear housing 3 and the shell 4. A feed box 6 is provided on the front side of the shell 4. A stopper base 7 is provided at the front end of the feed box 6. A nail magazine 8 for accommodating connecting screws is provided below the shell 4 and on the front side of the main body housing 2.

[0043] The main housing 2 is made of resin and integrally includes a motor housing 9 and a grip housing 10. The motor housing 9 is formed into a straight, inclined shape that moves rearward as it moves downward from the upper end connected to the gear housing 3. The grip housing 10 is formed into a ring shape with upper and lower ends connected at the rear side of the motor housing 9. The grip housing 10 has a grip portion 11 extending in the vertical direction.

[0044] The left and right half-split housings 2a and 2b are assembled with a plurality of screws 12, 12, ... screwed in from the left, thereby forming the main housing 2. The gear housing 3 is assembled to the front upper side of the main housing 2 with four screws 13, 13, ... from the front.

[0045] like Figure 4 As shown, a motor 15 is housed within the motor housing 9. The motor 15 is an inner rotor type brushless motor having a cylindrical stator 16 and a rotor 17 disposed inside the stator 16. The motor 15 is supported within the motor housing 9 such that a rotating shaft 18 provided on the rotor 17 extends upward along the inclination direction of the motor housing 9.

[0046] However, the motor 15 is arranged close to the front inner surface of the motor housing 9. Figure 6 As shown, support ribs 19, 19 are provided on the inner surface of the motor housing 9 to support the stator 16 at the front position. A transverse wall 20 is provided on the inner surface of the motor housing 9 on the upper rear side of the stator 16. This transverse wall 20 is connected to the support ribs 19, 19 and extends parallel to the rotating shaft 18.

[0047] The stator 16 includes a stator core 21, upper and lower insulators 22A and 22B, and a plurality of coils 23, 23, ... . A sensor circuit board 24 is screwed from below to the lower insulator 22B. The sensor circuit board 24 includes a rotation detection element (not shown) on its upper surface. The rotation detection element detects the magnetic field of the permanent magnet 27 provided on the rotor 17. The wires of each coil 23 are connected in a three-phase manner. The three-phase power supply line is led out from the rear side of the insulator 22B via the connector 25 to the controller 53 described later. The signal line of the rotation detection element is also led out from the rear side of the sensor circuit board 24 to the controller 53.

[0048] The rotor 17 includes a rotating shaft 18 and a rotor core 26 surrounding the rotating shaft 18. Inside the rotor core 26, a plurality of permanent magnets 27, 27, ... are fixed.

[0049] The lower end of the rotating shaft 18 is rotatably supported by a lower wall 28 extending upward from the inner surface of the motor housing 9 via a bearing 29. The lower wall 28 is spaced apart from the lower end of the horizontal wall 20, and the connector 25 protrudes into the motor housing 9 from between the two walls 28 and 20.

[0050] The upper portion of the rotating shaft 18 protrudes upward from an upper wall 30 extending vertically from the inner surface of the motor housing 9. The upper portion of the rotating shaft 18 is rotatably supported by a bearing 31 held by the gear housing 3. The upper end of the rotating shaft 18 is provided with a pinion 32 and protrudes into the gear housing 3.

[0051] A fan 33 is provided between the stator 16 and the bearing 31 and on the rotating shaft 18. The fan 33 is a centrifugal fan and is housed in a fan housing chamber 34 surrounded by the upper support ribs 19, the lateral wall 20, and the upper wall 30.

[0052] Multiple lower exhaust ports 35, 35... are formed outside the fan 33 and on the left and right side surfaces of the motor housing 9. These ports are arranged in an inclined direction perpendicular to the rotation axis 18, with the front lower and the rear higher. Below the fan 33 and on the left and right side surfaces of the motor housing 9, multiple air inlets 36, 36... are formed side by side along the axial direction of the rotation axis 18. The total opening area of ​​the air inlets 36 is smaller than the total opening area of ​​the lower exhaust ports 35.

[0053] In addition, two middle exhaust ports 37, 37 are formed on the left and right sides of the motor housing 9 at a position higher than the upper wall 30. Slits 38 ( Figure 6 ).

[0054] In addition, upper exhaust ports 39 are formed behind the gear housing 3 and on both left and right side surfaces of the main housing 2. A gap 40 is formed between the horizontal wall 20 and the upper wall 30 to allow the rear of the gear housing 3 to communicate with the fan accommodation chamber 34.

[0055] Therefore, if Figure 6 As shown, a first cooling path 41 is formed in the main body housing 2. In this first cooling path 41, when the fan 33 rotates, external air drawn in through the air inlet 36 rises within the motor housing 9, reaches the fan housing chamber 34, and is discharged from the lower exhaust port 35. Furthermore, a second cooling path 42 is formed in the main body housing 2. In this second cooling path 42, a portion of the air not discharged from the lower exhaust port 35 rises through the slit 38 and is discharged from the middle exhaust port 37. Furthermore, a third cooling path 43 is formed in the main body housing 2. In this third cooling path 43, another portion of the air not discharged from the lower exhaust port 35 rises through the gap 40 and is discharged from the upper exhaust port 39.

[0056] A switch 45 is provided at the upper portion of the grip 11, which causes a trigger 46 to protrude forward. A forward / reverse switching lever 47 is provided above the switch 45. A forward / reverse lever switch (not shown) is provided between the switch 45 and the forward / reverse switching lever 47, which switches operation in response to operation of the forward / reverse switching lever 47. A lock button 48 is provided below the forward / reverse switching lever 47 to maintain the trigger 46 depressed.

[0057] A battery mounting portion 50 is formed at the lower portion of the grip housing 10. A battery pack 51 is slidably mounted on the battery mounting portion 50 from the rear. A terminal block 52 electrically connected to the battery pack 51 is provided within the battery mounting portion 50. A controller 53 is housed above the terminal block 52. The controller 53 includes a control circuit board 54. In addition to the microcomputer and switching elements, Figure 7 and Figure 8 As shown in FIG, the control circuit board 54 further includes a push button switch 55 for mode switching and an LED 56 for mode switching display. The push button switch 55 and the LED 56 are arranged along the left edge of the control circuit board 54.

[0058] A switch plate 60 is provided on the upper left side of the control circuit board 54 and on the half-split housing 2a. The switch plate 60 has a rectangular shape when viewed from above and is fixed in a state of being fitted into a rectangular hole 61 formed on the upper left side surface of the battery mounting portion 50. An actuating rod 62 is integrally formed on the switch plate 60, which is lowered by a pressing operation from above. Figure 7 As shown, the action bar 62 is located directly above the push button switch 55 .

[0059] A square tube portion 63 is integrally formed downwardly on the switch plate 60 in front of the actuating rod 62. The square tube portion 63 is located directly above the LED 56. The through hole of the square tube portion 63 forms an opening 63a on the upper surface of the switch plate 60.

[0060] A display sheet 64 is attached to the upper surface of the switch plate 60. The display sheet 64 displays a button display portion 65 covering the upper surface of the actuating bar 62 and a transparent light emitting portion 66 covering the opening 63a of the square tube portion 63.

[0061] like Figure 4 As shown, the clutch 5 includes an intermediate shaft 70 , a first main shaft 71 , a clutch cam 72 , a coil spring 73 , and a second main shaft 74 in the gear housing 3 .

[0062] First, if Figure 5 As shown, the gear housing 3 includes a front gear housing 301 and a rear gear housing 302. The front gear housing 301 is made of a metal such as an aluminum alloy and is formed into a quadrilateral shape in a front view with an opening on the rear surface. An upper through hole 303 is formed in the front upper portion of the front gear housing 301 along the front-to-back direction. A front bearing retaining portion 304 is recessed in the front lower portion of the front gear housing 301. A lower through hole 305 is formed in the lower portion of the front gear housing 301 in a direction inclined toward the rear lower side. The lower portion of the front gear housing 301 protrudes into the motor housing 9 and is retained by the upper wall 30. Four screw holes 306, 306... are formed on the rear surface of the front gear housing 301 and around the opening. Front holes 307, 307... are formed at the four corners of the front gear housing 301 for the screws 13, 13... to pass through.

[0063] The rear gear housing 302 is made of resin and is formed into a plate-like shape that encloses the rear surface of the front gear housing 301. A peripheral wall portion 308 is formed on the front surface of the rear gear housing 302, which engages with the opening of the front gear housing 301 from the rear. A flange portion 309 is provided outside the peripheral wall portion 308, which abuts the rear surface of the front gear housing 301. A sealing ring 310 is formed between the rear surface of the front gear housing 301 and the flange portion 309, surrounding the peripheral wall portion 308. The sealing ring 310 is positioned by engaging with a groove formed on the front surface of the flange portion 309 around the peripheral wall portion 308. Four through holes 311, 311, ... are formed outside the sealing ring 310 and in the flange portion 309, corresponding to the screw holes 306 of the front gear housing 301. Four rear holes 312, 312, ... are formed at the four corners of the flange portion 309, corresponding to the front holes 307.

[0064] Rear bearing holding portions 313 and 314 are formed in upper and lower positions on the front surface of the rear gear housing 302 and inside the peripheral wall portion 308 .

[0065] The rear gear housing 302 houses the clutch 5 and is assembled with the peripheral wall portion 308 fitting into the opening of the front gear housing 301, with the seal ring 310 interposed therebetween. The seal ring 310, positioned within the groove of the flange portion 309, is compressed by contact with the rear surface of the front gear housing 301. In this state, four screws 315, 315... are inserted from the rear through the through holes 311 and screwed into the threaded holes 306. The rear gear housing 302 is thus fixed to the front gear housing 301. The assembled gear housing 3 is then assembled to the main housing 2 using the screws 13 that penetrate the front holes 307 and the rear holes 312.

[0066] If the front gear housing 301 and the rear gear housing 302 are fixed in advance with the screws 315 in this manner, assembly to the main body housing 2 becomes easy. However, the fixing with the screws 315 may be omitted.

[0067] The intermediate shaft 70 is arranged within the front gear housing 301 of the gear housing 3, with its axis oriented in the front-to-back direction. The front end of the intermediate shaft 70 is rotatably supported by a bearing 76 held in the front bearing retaining portion 304 of the front gear housing 301. The rear end of the intermediate shaft 70 is rotatably supported by a bearing 77 held in the rear bearing retaining portion 314 of the rear gear housing 302. A bevel gear 78 is integrally rotatably provided in the middle portion of the intermediate shaft 70. The bearing 31, which supports the upper portion of the rotating shaft 18, is retained in the lower through-hole 305 of the front gear housing 301. Bearing 31 employs a bearing with seals sandwiched axially above and below between the outer and inner rings. The lower portion of the front gear housing 301 protrudes into the motor housing 9. The pinion gear 32 protrudes into the front gear housing 301 and meshes with the bevel gear 78. A first gear 79 is integrally provided at the rear portion of the intermediate shaft 70. O-rings are attached to the bearing 31 supporting the pinion gear 32 and the bearing 76 supporting the front end of the intermediate shaft 70. As a result, the pinion gear 32 and the front end of the intermediate shaft 70 are elastically retained within the front gear housing 301, maintaining proper meshing between the pinion gear 32 and the bevel gear 78.

[0068] The first main shaft 71 is disposed above the intermediate shaft 70 with its axis oriented in the front-to-rear direction. The rear end of the first main shaft 71 is rotatably supported by a bearing 80 held by a rear bearing retaining portion 313 of the rear gear housing 302. A second gear 81 is provided at the rear of the first main shaft 71 for integral rotation. The second gear 81 meshes with the first gear 79.

[0069] The clutch cam 72 is coupled to the second gear 81 so as to be integrally rotatable via a plurality of balls 82 , 82 . . . A rear cam portion 83 is formed on the front surface of the clutch cam 72 .

[0070] The second main shaft 74 is coaxially arranged in front of the first main shaft 71. The second main shaft 74 is rotatably and movably held in the upper through hole 303 of the front gear housing 301 and the sleeve 84 held by the housing 4.

[0071] The front portion of the first spindle 71 is inserted into a bottomed hole 85 provided at the rear portion of the second spindle 74. A bearing 86 is fixed in the bottomed hole 85. The front end of the first spindle 71 is loosely inserted into the bearing 86 and supported in the bottomed hole 85 so as to be rotatable coaxially with the second spindle 74.

[0072] The coil spring 73 is externally mounted on the first main shaft 71 . The rear end of the coil spring 73 contacts the front surface of the clutch cam 72 . The front end of the coil spring 73 contacts the rear surface of the bearing 86 .

[0073] A flange 87 is formed at the rear end of the second main shaft 74. A front cam portion 88 is formed on the rear surface of the flange 87. The front cam portion 88 faces the rear cam portion 83 of the clutch cam 72. The front cam portion 88 and the rear cam portion 83 engage with each other in the forward and reverse rotation directions while in contact with each other.

[0074] The second main shaft 74 is urged forward by the coil spring 73. A stopper 89 is supported at the rear end of the sleeve 84. The flange 87 of the second main shaft 74 contacts the stopper 89, thereby restricting the forward movement of the second main shaft 74.

[0075] A bit holding portion 75 is formed at the front end of the second spindle 74. A bit such as a driver bit as a front end tool can be attached to and detached from the bit holding portion 75 from the front.

[0076] A pressing drive mechanism 90 forming a mechanism portion of a pressing drive mode is provided in the main body housing 2. The pressing drive mechanism 90 includes a rod 91, an operating lever 92, and a sensor substrate 93.

[0077] The rod 91 is provided at the axis of the first main shaft 71 as a separate body from the first main shaft 71 and is movable forward and backward. The rear end of the rod 91 passes through the rear gear housing 302 and protrudes into the main body housing 2.

[0078] The operating lever 92 is located behind the rear gear housing 302. The operating lever 92 is rotatably held by left and right bosses 94, 94, which protrude from the inner surface of the main housing 2. The operating lever 92 includes a pressing piece 95 protruding downward from the rear of the lever 91 and a detecting piece 96 protruding upward from the rear of the pressing piece 95. The detecting piece 96 is provided with a magnet 97.

[0079] The sensor substrate 93 is arranged behind the detection piece 96. The sensor substrate 93 includes a magnetic sensor such as a Hall element and can detect changes in the magnetic field of the magnet 97 caused by the rotation of the detection piece 96. The operating lever 92 is normally in the first rotation position ( ) where the detection piece 96 contacts the front surface of the sensor substrate 93 due to the biasing force of the torsion spring 98. Figure 4 The position indicated by the solid line in the figure).

[0080] The rod 91 is in the advanced position pressed by the pressing piece 95 of the operating lever 92 in the first rotation position. The rod 91 in the advanced position has its tip abutting against the inner bottom surface of the bottomed hole 85 of the second spindle 74 in the advanced position.

[0081] In the push drive mechanism 90, when the rod 91 moves backward, the rear end of the rod 91 presses the pressing piece 95 of the operating lever 92 backward, causing the operating lever 92 to rotate to the second rotation position indicated by the two-dot chain line. This causes the detection piece 96 to rotate forward and move forward away from the sensor substrate 93. Consequently, the sensor substrate 93, having detected the change in the magnetic field caused by the movement of the magnet 97, outputs an ON signal.

[0082] Operation signals from the switch 45, the forward / reverse lever switch of the forward / reverse switching lever 47, the sensor substrate 93, and the push button switch 55 are input to the microcomputer on the control circuit board 54. Based on the signal from the forward / reverse lever switch, the microcomputer sets the rotation direction of the motor 15 and drives the motor 15. Based on the operation signal from the push button switch 55, the microcomputer sets the operation mode.

[0083] The feed box 6 is urged by a coil spring 100 toward a forward position protruding from the housing 4. Unillustrated connecting screws removed from the staple cartridge 8 are inserted from below and placed in the feed box 6. A feed mechanism 101 is provided in the feed box 6. This feed mechanism 101 feeds the connecting screws one by one to the screw tightening position by the cutter head by retreating against the urging of the coil spring 100.

[0084] The stopper base 7 can be adjusted in its installation position relative to the feed box 6 in the front-to-back direction. The installation position is adjusted to match the length of the screw. The depth adjustment dial 102 is used to adjust the protrusion of the blade from the stopper base 7, thereby setting the tightening depth of the screw.

[0085] In the screwdriver 1 constructed as described above, if the button display portion 65 of the switch plate 60 is pressed, the actuating rod 62 descends, causing the button switch 55 to turn on. The microcomputer then switches the operating mode to the push-drive mode and turns on the LED 56. When the LED 56 turns on, its light passes through the square tube portion 63 and shines toward the opening 63a, causing the light-emitting portion 66 to emit light. If the button display portion 65 is pressed again, the actuating rod 62 descends, causing the button switch 55 to turn off. The microcomputer then switches the operating mode to the normal mode and turns off the LED 56. Consequently, the light-emitting portion 66 turns off.

[0086] At this time, the operator holds the grip 11 with the right hand and presses the button display portion 65 of the switch plate 60 with the left hand. Since the switch plate 60 is arranged on the left upper surface of the battery mounting portion 50, it can be easily operated.

[0087] When the operating mode is switched, the light emitting unit 66 turns on or off, allowing visual confirmation of the switching of the operating mode. At this time, the light emitting unit 66 is located on the left upper surface of the battery mounting portion 50, further forward than the grip portion 11. Therefore, the right hand gripping the grip portion 11 does not block the light emitting unit 66. Therefore, the operator can easily confirm whether the light emitting unit 66 is on or off.

[0088] Next, the usage in specific operation modes will be described. First, the normal mode will be described.

[0089] The cutter head is mounted on the cutter head retaining portion 75 of the second main shaft 74, and the forward / reverse switching lever 47 is in the forward rotation position. Next, the operator grips the gripping portion 11 and brings the stopper base 7 into contact with the surface of the workpiece, such as a gypsum board. Next, the operator presses the trigger 46. As a result, the switch 45 is turned on, and power is supplied from the battery pack 51 to the motor 15 via the control circuit board 54. As a result, the rotor 17 rotates forward, and the rotation of the rotating shaft 18 is transmitted from the pinion 32 to the intermediate shaft 70. If the intermediate shaft 70 decelerates, the first main shaft 71 and the clutch cam 72 also rotate forward as a whole. However, the second main shaft 74 is in the forward position, so that the front cam portion 88 does not engage with the rear cam portion 83 of the clutch cam 72. Therefore, the second main shaft 74 does not rotate.

[0090] Next, the operator presses the grip 11 to advance the screwdriver 1. As a result, the feed box 6 overcomes the force of the coil spring 100 and retreats. At the same time, the feed mechanism 101 feeds the connecting screws one by one, so that the initial screw is located in front of the cutter head. If the initial screw abuts the workpiece, the second spindle 74 and the cutter head together overcome the force of the coil spring 73 and retreat. As a result, the front cam portion 88 of the second spindle 74 engages with the rear cam portion 83, and the rotation of the clutch cam 72 is transmitted to the second spindle 74. As a result, the cutter head and the second spindle 74 rotate forward together, and the screw is screwed into the workpiece.

[0091] As the screw is tightened, the screwdriver 1 moves forward, causing the stopper base 7 to come into contact with the housing 4. Then, only the second spindle 74 moves forward as the screw is screwed in. If the front cam portion 88 separates from the rear cam portion 83, the rotation transmission to the second spindle 74 is cut off and the screw tightening is completed. If the operator releases the pressing operation on the trigger 46, the switch 45 is disconnected and the rotation of the rotor 17 stops. If the cutter head is separated from the screw, the feed box 6 returns to the forward position based on the force of the coil spring 100. The second spindle 74 also returns to the forward position based on the force of the coil spring 73. Therefore, if the operator presses the grip 11 to move the screwdriver 1 forward, the next screw is fed out and screwed in. Continuous screw tightening operations can be performed through this repeated operation.

[0092] Furthermore, since a screwdriver that automatically feeds out screws can be automatically loaded (automatically caulked), it is called an automatic loading screwdriver. However, companies other than the applicant sometimes refer to it as a coupling screwdriver, a collate screw gun, or an auto feed screw gun.

[0093] On the other hand, in the push drive mode, the motor 15 does not drive even if the trigger 46 is pressed. If the stopper base 7 is pushed against the workpiece to advance the screwdriver 1 and retract the feed box 6 and the second spindle 74, the rod 91 abutting against the inner bottom surface of the bottomed hole 85 retracts.

[0094] The rear end of rod 91 then abuts against pressing piece 95 of operating lever 92, causing operating lever 92 to rotate to the second rotational position as described above. Consequently, an ON signal is output from sensor substrate 93, and the microcomputer drives motor 15 in response to this ON signal. The front cam portion 88 then engages with the rear cam portion 83, transmitting the rotation of clutch cam 72 to the second spindle 74. This causes the cutter head to rotate forward along with the second spindle 74, enabling screw tightening.

[0095] Regardless of the operation mode, if the fan 33 rotates along with the rotation of the rotating shaft 18, external air is sucked in from the air inlet 36 on the side of the main housing 2. The external air from the air inlet 36 passes through the first cooling path 41 between the stator 16 and the rotor 17 and is discharged to the outside from the lower exhaust port 35. Thus, the motor 15 is cooled. In addition, a portion of the external air that is not discharged from the lower exhaust port 35 passes through the second cooling path 42 through the slit 38 and is discharged to the outside from the middle exhaust port 37. Thus, the bearing 31 is cooled. In addition, another portion of the external air that is not discharged from the lower exhaust port 35 passes through the third cooling path 43 through the gap 40 and is discharged from the upper exhaust port 39. Thus, the gear housing 3 is cooled.

[0096] The screwdriver 1 of the above-described embodiment includes a motor 15 having a stator 16 and a rotor 17 rotatable relative to the stator 16, with a rotational shaft 18 (rotor shaft) extending forward and upward. The screwdriver 1 also includes a switch 45 for rotating the rotor 17, a pinion 32 rotated by the rotational shaft 18, a clutch 5 to which rotation is transmitted by the pinion 32, and a bit holder 75 disposed forward and backward on the front side of the clutch 5. The screwdriver 1 also includes a gear housing 3 that houses the pinion 32 and the clutch 5, with a front gear housing 301 (partially made of metal); a resin motor housing 9 connected to the gear housing 3 and housing the motor 15; and a resin grip 11 connected to the motor housing 9 and housing the switch 45. Furthermore, the screwdriver 1 is structured as follows: if the bit holding portion 75 is on the rear side, the clutch 5 becomes connected, so that the rotation of the rotor 17 is transmitted to the bit holding portion 75; if the bit holding portion 75 is on the front side, the clutch 5 becomes disconnected, so that the rotation of the rotor 17 is not transmitted to the bit holding portion 75.

[0097] This structure shortens the overall length in the front-to-back direction, making it compact. Furthermore, since the front gear housing 301 is made of metal, the pinion 32 and bevel gear 78 can be positioned with predetermined accuracy. This makes it easy to achieve dimensional accuracy and prevent the generation of gear noise.

[0098] The gear housing 3 holds the bearing 31 supporting the pinion 32, and the front gear housing 301 including the lower through hole 305 holding the bearing 31 is made of metal. Therefore, the contact between the teeth of the pinion 32 and the bevel gear 78 is relatively stable, which can effectively prevent the generation of gear noise.

[0099] The gear housing 3 is divided into two in the front-rear direction, thereby effectively preventing grease leakage.

[0100] A seal ring 310 (seal member) is sandwiched between the front gear housing 301 (front portion) and the rear gear housing 302 (rear portion) of the divided gear housing 3. Therefore, grease leakage from between the front gear housing 301 and the rear gear housing 302 is unlikely to occur.

[0101] The front gear housing 301 of the gear housing 3 divided into two is made of metal, and the rear gear housing 302 is made of resin. Therefore, the gear housing 3 can be made lightweight.

[0102] The front gear housing 301 and the rear gear housing 302 that are divided into two are fastened with screws.

[0103] Therefore, the gear housing 3 can be easily assembled to the main body housing 2 .

[0104] The motor housing 9 includes a pair of half housings 2a and 2b that are divided in the left-right direction, and the lower portion of the gear housing 3 is sandwiched between the half housings 2a and 2b.

[0105] The motor 15 is housed in the motor housing 9 in an inclined posture with the rotary shaft 18 extending toward the front and upward. Therefore, even if the motor 15 is directed upward, it is possible to ensure an installation space for the staple magazine 8.

[0106] The gear housing 3 is arranged above the motor housing 9, and the pinion 32 provided on the upper end of the rotating shaft 18 protrudes into the gear housing 3. Therefore, the gear housing 3 and the motor housing 9 overlap in the vertical direction, which is effective for compactness in the front-rear direction.

[0107] The screwdriver 1 of the above embodiment includes a motor 15 having a stator 16 and a rotor 17 rotatable relative to the stator 16, with a rotational shaft 18 extending forward and upward. The screwdriver 1 also includes a switch 45 for rotating the rotor 17, a pinion 32 rotated by the rotational shaft 18, a clutch 5 to which rotation is transmitted by the pinion 32, and a bit holder 75 disposed forward and backward on the front side of the clutch 5. The screwdriver 1 also includes a gear housing 3 that houses the pinion 32 and the clutch 5 and is bisected in the front-to-back direction; a motor housing 9 connected to the gear housing 3 and housing the motor 15; and a resin grip 11 connected to the motor housing 9 and housing the switch 45. Furthermore, the screwdriver 1 is structured as follows: if the bit holding portion 75 is on the rear side, the clutch 5 becomes connected, so that the rotation of the rotor 17 is transmitted to the bit holding portion 75; if the bit holding portion 75 is on the front side, the clutch 5 becomes disconnected, so that the rotation of the rotor 17 is not transmitted to the bit holding portion 75.

[0108] This structure shortens the overall length in the front-to-back direction and makes the housing compact. In addition, the gear housing 3 is divided into front and back sections, so that the sealing performance can be improved. Thus, grease leakage can be effectively prevented.

[0109] Hereinafter, modification examples will be described.

[0110] Regarding the gear housing, the front gear housing can be made of resin, and the rear gear housing can be made of metal. Both can be made of metal. Only the retaining portion of the front gear housing that supports the bearing of the pinion (the lower through-hole portion in the above method) can be made of metal. For example, the ring that retains the bearing can be made of metal and embedded in other parts. A part of the front gear housing including the upper through-hole and other parts can be made of metal. Similarly, only a part of the rear gear housing, such as the rear bearing retaining portion, can be made of metal.

[0111] In the invention where a portion of the gear housing is made of metal, the gear housing can be divided into left and right, or up and down, instead of being divided into front and back. In this case, the gear noise reduction effect brought about by the use of metal can also be expected.

[0112] In the invention where the gear housing is divided into two in the front-to-back direction, both the front and rear portions can be made of resin. In this case, the effect of preventing grease leakage can also be expected. Multiple sealing components can be provided.

[0113] The motor is not limited to an inclined position with the rotating shaft facing forward and upward. It can also be a position with the rotating shaft extending vertically. In this case, the intermediate shaft also extends vertically, and the rotation can be transmitted to the clutch side using, for example, a bevel gear.

[0114] The motor housing is not limited to a structure consisting of left and right half-split housings, and may be an integral cylindrical shape.

[0115] The gripping portion is not limited to an annular shape, and may be a linear or L-shaped portion protruding from the clutch.

[0116] The motor is not limited to the brushless type.

[0117] Additionally, the screwdriver can be used without the connecting screw.

Claims

1. A plate screwdriver, characterized in that: The plate screwdriver comprises: a motor having a stator and a rotor rotatable relative to the stator and having a rotor shaft extending at least in a vertical direction; a switch for causing the rotor to rotate; a pinion gear rotated by the rotor shaft; a clutch to which rotation is transmitted via the pinion; a cutter head holding portion, which is arranged on the front side of the clutch and can move forward and backward; a gear housing, which houses the pinion and the clutch and is at least partially made of metal; a resin motor housing connected to the gear housing and housing the motor; and A resin grip portion is connected to the motor housing and houses the switch. The gear housing holds the bearing supporting the pinion, and at least the holding portion of the bearing is made of metal. When the bit holding portion is at the rear side, the clutch is turned on so that the rotation of the rotor is transmitted to the bit holding portion. When the bit holding portion is located at the front side, the clutch is in a disengaged state so that the rotation of the rotor is not transmitted to the bit holding portion.

2. The plate screwdriver according to claim 1, characterized in that The gear housing is divided into two in the front-rear direction.

3. The plate screwdriver according to claim 2, characterized in that: A sealing member is sandwiched between the front portion and the rear portion of the gear housing that is divided into two.

4. The plate screwdriver according to claim 2 or 3, characterized in that: The front portion of the gear housing divided into two parts is made of metal, and the rear portion is made of resin.

5. The plate screwdriver according to claim 2 or 3, characterized in that: The front and rear portions of the gear housing divided into two are fastened with screws.

6. The plate screwdriver according to any one of claims 1 to 3, characterized in that: The motor housing includes a pair of half-split housings divided into two in the left-right direction, and at least a portion of the gear housing is held between the half-split housings.

7. The plate screwdriver according to any one of claims 1 to 3, characterized in that: The motor is housed in the motor housing in an inclined posture with the rotor shaft extending forward and upward.

8. The plate screwdriver according to claim 7, characterized in that The gear housing is arranged on the upper side of the motor housing, and the pinion provided on the upper end of the rotor shaft protrudes into the gear housing.

9. The plate screwdriver according to any one of claims 1 to 3, characterized in that: The pinion gear transmits rotation to an intermediate shaft extending in the front-rear direction. The intermediate shaft transmits the rotation to the clutch. The intermediate shaft is held by the gear housing.

10. The plate screwdriver according to claim 1, wherein: The rotor shaft extends in the up-down direction. The rotor shaft transmits rotation to an intermediate shaft extending in the vertical direction. The rotor shaft and the intermediate shaft are held by the gear housing.

11. A screwdriver for plate, characterized in that: The plate screwdriver comprises: a motor having a stator and a rotor rotatable relative to the stator and having a rotor shaft extending at least in a vertical direction; a switch for causing the rotor to rotate; a pinion gear rotated by the rotor shaft; a clutch to which rotation is transmitted via the pinion; a cutter head holding portion, which is arranged on the front side of the clutch and can move forward and backward; a gear housing, which houses the pinion and the clutch and is divided into two in the front-to-back direction; a motor housing connected to the gear housing and accommodating the motor; and A resin grip portion is connected to the motor housing and houses the switch. The front part of the gear housing is made of metal, and the rear part is made of resin. The front part holds the bearing supporting the pinion gear. When the bit holding portion is at the rear side, the clutch is turned on so that the rotation of the rotor is transmitted to the bit holding portion. When the bit holding portion is located at the front side, the clutch is in a disengaged state so that the rotation of the rotor is not transmitted to the bit holding portion.

12. The plate screwdriver according to claim 11, wherein: A sealing member is sandwiched between the front portion and the rear portion of the gear housing that is divided into two.

13. The plate screwdriver according to claim 11 or 12, characterized in that: The front and rear portions of the gear housing divided into two are fastened with screws.

14. The plate screwdriver according to claim 11 or 12, characterized in that: The motor housing includes a pair of half-split housings divided into two in the left-right direction, and at least a portion of the gear housing is held between the half-split housings.

15. The plate screwdriver according to claim 11 or 12, characterized in that: The motor is housed in the motor housing in an inclined posture with the rotor shaft extending forward and upward.

16. The plate screwdriver according to claim 15, characterized in that The gear housing is arranged on the upper side of the motor housing, and the pinion provided on the upper end of the rotor shaft protrudes into the gear housing.

17. The plate screwdriver according to claim 11 or 12, characterized in that: The pinion gear transmits rotation to an intermediate shaft extending in the front-rear direction. The intermediate shaft transmits the rotation to the clutch. The intermediate shaft is held by the front and rear portions of the gear housing that are divided into two.

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