JPH0725037B2 - Slide mechanism of automatic screw tightener - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sets a nose member to which a connecting band having a row of screws is set and sequentially feeding the connecting band.
It relates to an automatic screw tightener that removes the screw sent on the bit axis line by a driver bit driven by power from the connecting band and tightens the screw to a desired part such as a building material. The present invention relates to a slide mechanism that slides a nose member relative to a driver bit during operation.

[0002]

2. Description of the Related Art Generally, in this type of automatic screw tightening machine, a screw feeding mechanism for feeding one connecting band having a row of screws mounted on the axis of a driver bit for each screw tightening operation is a nose member. It employs a configuration that supplies screws using the initial operation. That is, slightly rotate the wheel engaged with the coupling band by one tooth from the most projecting position where the nose member is pressed against the site such as the building material where the screw is to be tightened and slid to the driver body side. One screw is positioned, and the driver bit is engaged with the screw by the stroke of the subsequent nose member so as to project outward, and the screw is driven at a desired portion by rotationally driving the bit.

For example, an automatic screw tightening machine of this type is disclosed in US Pat. No. 4,590,034, JP-B-60-26921.
No. 2-127676 and the like.

[0004]

However, in the known screw tightening machine of this type, the tip of the driver bit remains in the retracted position where it does not engage with the screw until the screw feeding operation by the wheel is completed. Therefore, there is a mechanical restriction that the tip of the bit cannot be projected so much longer than the driver main body. Therefore, there is a problem that the stroke cannot be set sufficiently long in the operation of tightening the screw while the bit engages the screw and the nose member slides into the driver body.

The above problem is particularly noticeable in a work environment where there are irregularities such as stepped portions around the screw tightening site, or when a screw hole is provided deeply from the side surface to which the screw is tightened. Is. That is, in such a case,
Before the screw is guided to the screw hole, the tip of the screw tightening machine hits and is blocked by the surrounding irregularities and the surface of the other side, so the driver bit cannot reach the screw tightening part, and the screw tightening work The problem that it was impossible was unavoidable.

For this reason, for example, as a measure for increasing the protruding amount of the driver bit, it is conceivable to increase the wheel diameter, but the overall size of the screw tightening machine including the nose member for supporting the wheel is increased. However, other problems such as weight increase and cost increase occurred.

In particular, in today's construction materials for tightening screws, the number of places where screws are tightened such as deep holes is increased from the viewpoint of design so that the screw heads do not come out on the member surface. Therefore, the conventional screw tightening machine could not handle it, and it was expected that an immediate solution would be provided.

[0008]

SUMMARY OF THE INVENTION Therefore, in view of the above problems of the conventional screw tightening machine, the present invention can secure a sufficient projecting amount of the driver bit, and perform the screw tightening work in the deep hole portion or around the unevenness. It is an object of the present invention to provide a slide mechanism of an automatic screw tightener that can be easily performed, is small, and can be used easily.

To achieve the above object, the present invention provides a driver body having a driver bit that is rotationally driven, and screw supply means for supplying a screw mounted and mounted on a connecting band onto the axis of the driver bit. A nose member having a chuck means for holding a screw on the axis of the driver bit, and a nose member that slidably supports the nose member along the axis of the driver bit and relatively to the driver body. A slide member slidably supported, and a nose member for moving the nose member between a most projecting position projecting most outward from the driver body and a retracted position moving inward of the driver body. An automatic screwdriver equipped with a moving means; when the nose member is at the most projecting position, the slide member is fixed to the driver main body and The relative movement between the closing member and the slide member, fixing both members at an intermediate position where the nose member has moved a predetermined distance relative to the slide member from the most protruding position, and slides with respect to the driver body. The automatic screw tightening machine is provided with a cooperation means for selectively fixing and releasing the three members of the nose member, the slide member and the driver main body so as to release the fixation of the members. A slide mechanism is provided.

In the proposed automatic screw tightener, the driver body has a sleeve-shaped inner peripheral surface, and the slide member slides on the sleeve-shaped inner peripheral surface of the driver body in the axial direction of the driver bit. The nose member is configured to have a slidable sleeve wall, and the nose member has a sleeve-shaped outer circumferential surface slidably in contact with the inner circumferential surface of the sleeve wall of the sliding member and slidable in the axial direction of the driver bit; A rolling element housed in a through hole formed in the sleeve wall of the slide member, and a recess formed in the sleeve-like inner peripheral surface of the driver body and the sleeve-like outer peripheral surface of the nose member respectively; When the nose member, the slide member, and the driver body are relatively moved, a part of the rolling element engages with and disengages from the recessed portion, so that these three members are mutually engaged. It proposes a configuration in which fixing and releasing between are performed in cooperation with each other.

[0011]

According to the above proposed structure, the nose member is slidably supported by the slide member interposed between the driver body and the nose member, and the nose member is fixed to the driver body by the cooperation means at the initial stage of starting the movement from the most protruding position. The slide member is moved by a predetermined distance relative to the slide member. During this time, the screw feeding means performs the screw feeding operation by utilizing the relative movement between both members. Next, after the completion of the movement in the first stage, the cooperation means releases the above-mentioned fixing and fixes the slide member and the nose member, whereby both members are integrally formed by the nose member moving means in the retracting direction with respect to the driver body. Driven and held in retracted position. As a result, the nose member is largely retracted toward the driver body side, so that the driver bit does not depend on the feed configuration of the connecting band and can protrude from the nose member, so that the portion to be screwed has deep holes or irregularities. The screw can be easily introduced even at a place.

The linking means accommodates a rolling element formed of, for example, a sphere in a through hole formed in the sleeve wall of the slide member, and is formed on the inner and outer peripheral surfaces of the driver body and the nose member corresponding thereto. The rolling element is partially engaged with the matching concave portion at a position where the concave portion matches the rolling element, whereby the slide member and one member are fixed. or,
When the rolling element is aligned with the other recess, the operation is switched so that the rolling member is partially engaged with the recess, the fixing is released, and at the same time, the slide member and the other member are fixed. In this way, the structure in which the rolling elements and the recesses are simple and does not require a space allows the three members to be fixed and released smoothly.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic screw tightening machine having a slide mechanism according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the tip of this automatic screw tightening machine. Reference numeral 10 denotes a driver main body which houses a driver bit 12 along the axis XX, and 14 denotes a chuck 1.
6, a nose member provided with the screw supply mechanism 18 and a guide surface 14a for guiding the connecting band 22 made of synthetic resin in which the screws 20 are arranged at intervals, and 24 is the driver body 10 and the nose member 14 And a slide member 26 interposed between the driver body 10, the nose member 14 and the slide member 24.
It is a cooperation mechanism that selectively performs fixing and releasing between members.

In FIG. 1, the nose member 14 is in the most projecting position, and this position is the state in which the nose member 14 projects in the direction most distant from the driver body 10 (the right side in the drawing), and the screw tightening operation starts. Alternatively, it is in a dormant state. At the most projecting position, the nose member 14 has a stopper 28, which is a screw head screwed into the member 14, abutting one end of the opening 30 of the slide member 24 to regulate the position in the projecting direction, and the slide member 24. Is fixed to the driver main body 10 by the cooperation mechanism 26 in a relative slidable state along the axis XX.

The cooperation mechanism 26 is a rolling element 3 made of a sphere.
2. The sleeve wall 24 of the slide member 24 that accommodates the same
a, a through hole 34 formed in a, a recess 36 formed in the inner peripheral surface of the sleeve wall 10a of the driver body 10 slidingly contacting the outer peripheral surface of the sleeve wall 24a, and a sleeve of the nose member 14 slidingly contacting the inner peripheral surface of the sleeve wall 24a. It has a recess 38 formed on the outer peripheral surface of the wall 14b.

When the nose member 14 is at the most protruding position,
The rolling element 32 is not aligned with the recess 38 of the nose member 14, but is aligned with the recess 36 of the driver body 10 and is partially engaged therewith as shown in the drawing.
Thus, the slide member 24 and the driver body 10 are fixed so as not to move relative to each other as described above. In this embodiment, the linkage mechanisms 26 including the rolling elements 32 are provided one by one in a diametrically opposed manner. Each of the recesses 36, 38 is a truncated cone-shaped hole that partially receives the spherical surface of the rolling element 32,
As shown in the figure, the peripheral wall surface of the recess is slightly inclined so as to open outward, and this inclined surface imparts a component force for pushing the rolling element 32 outward. Thereby, a smoother switching movement of the rolling element 32 is possible.

The driver body 10, the nose member 14 and the slide member 24 are designed so as not to rotate relative to each other around the axis XX. That is, the opening 28 of the slide member 24 into which the stopper 28 on the nose member 14 has entered.
Has a width that allows the stopper 28 to slide exactly in the axial direction, so that the relative rotation of the two members 14 and 24 is prevented by this relationship. On the other hand, a stop screw 40 is screwed into the sleeve wall 10a of the driver body 10 from the outside, and the tip end portion of the stop screw 40 is slidably attached to the slide member 24.
Is engaged with a guide groove 42 formed on the outer peripheral surface of the sleeve wall 24a in the direction of the axis XX, and the width of the groove 42 is dimensioned to just slide the tip of the screw 40. Due to this relationship, relative rotation of both members 10 and 24 is prevented. It should be noted that, in FIG. 1, only the portions where the stop screw 40 and the guide groove 42 are provided are shown in different sectional views in different rotation directions for the sake of explanation.

FIG. 2 shows an external view of the automatic screw tightening machine of the present invention in a screw tightening operation state. As shown in the drawing, the tip of the driver bit 12 can be projected longer than the nose member 14 and the chuck 16, so that the screw tightening portion 44a of the mating member 44 such as a building material to be screwed is located at the deep hole position. In any case, the site 44
Up to a, it can be introduced with the screw 20 attached to the tip. On the outer circumference of the cylinder of the driver body 10, a locking ring 46 is movable along the outer peripheral surface by a predetermined distance.
Is provided, one end of the operating rod 50 enters the elongated hole 48 formed in the axial direction, and the other end is rotatably supported by the pivot shaft 52 at the rear end of the driver body 10. It is connected to the operation member 54. A pair of elongated holes 48 are formed in the diametrical direction, and correspondingly, the operating rod 50 extends from the operating member 54 in a bifurcated shape to correspond to each elongated hole 48. In the figure, the operating member 54, together with the operating rod 50 and the locking ring 46, is shown for the sake of convenience in a non-operating state or a rest state of the screw tightener. The operation member 5
When 4 is pressed in the direction of the arrow against the compression coil spring 53 at the start of the screw tightening work, the start switch button 56 arranged on the driver main body 10 at the lower position of the operation member 54 is simultaneously pressed, whereby A driver bit driving motor 58 electrically connected to the switch button 56 is started to have an interlocking structure for rotationally driving the driver bit 12.

A holder 59 attached to the driver body 10.
The tip 59a of the guides the long connecting strip 22 between the connecting strip reel (not shown) and the nose member 14, but the holder and other parts are known.

The screw supply mechanism 18 shown in FIGS. 1 and 3
In the figure, reference numeral 60 is a feed wheel, 62 is a feed operation lever described later, and 64 is a reverse rotation preventing pawl similarly described later.
The feed wheel 60 has teeth on its outer periphery that engage with the side edges of the coupling band 22, a pair is provided corresponding to each side edge, and the driver bit 12 passes through a space 66 between the pair of wheels. Has become. As shown in FIG. 3, the driver bit 12 passes through the space 66 along an axis YY that connects the support shafts 68 of the individual wheels 60 supported by the nose member 14 along the axis XX.

Chuck 16 attached to nose member 14
As shown in FIG. 3, a pair of openable and closable shafts 70 on the nose member 14 are used as fulcrums, and are normally closed by the compression coil springs 72.

In FIG. 4, 74 is a nose member moving mechanism for moving the nose member 14, and 76 is a clutch mechanism for selectively connecting and disconnecting the power from the driver bit driving motor 58 to the nose member moving mechanism 74. Reference numeral 78 denotes an automatic return mechanism for automatically returning the clutch mechanism 76 to the clutch engagement state in response to the start of rotational driving of the driver bit after the clutch mechanism 76 is disengaged.
The nose member 1 including the locking ring 46 described in 1.
4 is a holding mechanism that holds the slide member 4 together with the slide member 24 in the most retracted position in the driver body 10 direction.

The driver bit drive shaft 82, which is the power source of each mechanism, is connected to the motor shaft 58a of the motor 58 at one end (the left end in FIG. 4) and the driver bit 12 at the other end (the right end in FIG. 4). Pin 84 on the base end
Are detachably operably connected to each other. A driven shaft 86 having a cylindrical shape is fitted on the drive shaft 82, and the rotary member 8 is provided adjacent to the driven shaft 86 on the outer peripheral portion of the drive shaft 82.
8 is attached so as to be integrally rotatable. A compression coil spring 89 is stretched between the driver body 10 and the tip of the sleeve wall 14b of the nose member 14, whereby the nose member 14 is always urged toward the most protruding position.

First, the nose member moving mechanism 74 will be described with reference to FIGS. 4 and 11. Reference numeral 90 is a take-up drum, 92 is a plurality of planetary gears connected to the take-up drum 90 by a shaft 94, and 96 is a housing extending integrally with the driver body 10 along the axis XX in a cylindrical shape. The housing 96 has an internal gear section 96a that meshes with the planet gears 92. Further, each planetary gear 92 has a driven shaft 8
It is externally meshed with the sun gear portion 86a formed in No. 6. As shown in FIG. 11, a pulley 100 is rotatably supported on the housing 96 via a support shaft 98 in a plane parallel to the axis X-X. The cord-shaped body 102 is wound around the cylindrical outer peripheral surface of the winding drum 90, and the drum 90 is turned by 90 degrees via the pulleys 100 so that the axis line X-.
It is stretched in the driver body 10 in parallel with X, and the end portion is shown in FIG.
As shown in, the fixed terminal 1 is attached to the end wall 14c of the nose member 14.
It is attached by 04. Since each cord 102 passes through the passage 103 formed in the housing 96 at the portion suspended by the pulley 100, there is no interference with the housing 96.

When the winding drum 90 rotates in one direction, the cord-shaped members 102 start pulling the nose member 14 from the most projecting position (FIG. 1) via the pulley 100 accordingly. . When the driven shaft 86 is rotated by the winding drum 90 via the clutch mechanism 76, this rotation causes the rotation of the sun gear 86a, the planetary gear 92, and the internal gear 9.
The rotation speed is transmitted through the shaft 94 in a state where the rotation speed is converted by the planetary gear mechanism 6a.

Next, the clutch mechanism 76 will be described with reference to FIGS. 4, 6 and 12. Reference numeral 106 denotes a collar-shaped operation member which is fitted in the driven shaft 86 so as to be movable in the axial direction, and the pressing portion 1 which protrudes inward in a ring shape on the inner peripheral surface side.
06a and an outer peripheral surface of the driven shaft 86 have a release portion 106b that forms a space, and an O-ring 108 is provided on the outer peripheral surface side for slidingly contacting the tip inner surface 96b of the housing 96 with a predetermined frictional force. The spiral uneven portion 10 associated with an automatic return mechanism 78 described later is formed on the outer peripheral surface of the small diameter.
6c is integrally formed.

A pair of through holes 110 are formed in the driven shaft 86 in the diameter direction, and a spherical rolling element 112 is housed in each through hole.
Corresponding to this, the driver bit drive shaft 82 is particularly shown in FIG.
2, a clutch shaft portion 8 having a cutout portion 82a formed therein.
2b is provided, and the driver bit drive shaft 82 and the driven shaft 86 are coupled / disengaged in the form of a roller clutch via the rolling element 112. That is, the operating member 106
4 is located at the position shown in FIG.
Of the clutch mechanism 76 in the clutch engagement state shown in FIG. 12, whereby power is transmitted from the shaft 82 to the shaft 86. As a result, a winding operation for pulling in the nose member 14 by the nose member moving mechanism 74 is performed. On the other hand, the operating member 106 moves to the left from the position of FIG. 4 to move the release portion 1 onto the rolling element 112 as shown in FIG.
When 06b is positioned, the rolling element 112 is allowed to project outward, and as a result, the clutch mechanism 76 is switched to the clutch disengaged state shown by the chain line in FIG. This makes axis 8
No power is transmitted from the driven shaft 86 to the driven shaft 86. As a result, the driven shaft 86 becomes free, and the nose member moving mechanism 74 performs a rewinding operation during this period, as will be described later.

In the clutch mechanism 76, the switching operation from clutch engagement to disengagement is performed by the operation pin 114. A pair of the pins 114 are diametrically supported by the rotating member 88 so as to be slidable in the direction of the axis XX, and the inner end enlarged portion 114a is in contact with the inner wall of the rotating member 88 at all times, that is, in the clutch engaged state, as shown in FIG. It is in the most protruding state. These pins 114, when the nose member 14 is retracted, end wall 14c of the member as shown in FIG.
And is pushed inward from the rotating member 88 from the most protruding state. As a result, the operating member 106 moves to the left in FIG. 4, and the release portion 106b moves to the rolling element 1
12 and the clutch is disengaged.

The above-described switching from the clutch disengaged state of the clutch mechanism 76 to the clutch engaged state shown in FIG. 4 is performed by the automatic return mechanism 78, and will be described below with reference to FIGS. 4 and 13 in particular. As described above, the spiral concavo-convex portion 106c is formed on the small-diameter outer periphery of the operation member 106, and correspondingly, the spiral concavo-convex portion 106c is formed on the rotary member 88, particularly in FIG.
As shown by 3, a pair of claw members 116 facing each other in the diametrical direction.
Is pivotally supported by a shaft 118, and these claw members 1
16 is an engaging tooth 1 at the end of one arm with the shaft 118 as a fulcrum.
16 a and the other arm 116 b is formed to be long, and is configured to be rotatable from the solid line position (non-engaging position) shown to the chain line position (engaging position) by centrifugal force when the rotating member 88 rotates. . Only the engaging teeth 116a are formed narrow according to the groove width of the valley portion so that they can be engaged with the valley portion of the spiral uneven portion 106c. The other arm 116b does not enter the valley portion even if it contacts the mountain portion of the uneven portion 106c. Further, the claw member 116 is in the engagement position and the other arm 1
16b is in a state of protruding outward as shown by a chain line in FIG. 13, but when the nose member 14 is retracted, the sleeve wall 14b is fitted into the component portion including the rotating member 88 by the outside. The taper edge 14d formed at the tip of the sleeve wall 14b is pushed inward by the cam action. Therefore, the claw member 11
6 is forcibly removed from the spiral uneven portion 106c. In FIG. 13, the passing position of the sleeve wall 14c is shown by a chain line.

As described above, the releasing portion 1 of the operating member 106.
At a clutch disengagement position 06b corresponding to the rolling element 112, the driven element 86 is in a free state, during which the rewinding operation of the nose member moving mechanism 74 is performed by the bias of the spring 89, and the winding drum 90 is reversed. It rotates, and this also reversely rotates the driven shaft 86 via the planetary gear mechanism. Then, along with this, the operation member 106 may also follow and rotate, but in this case, the O-ring 108 is stopped due to the frictional force between the O-ring 108 and the inner surface 96b of the housing, and is left stationary.

In the above state, when the driver bit drive shaft 82 rotates with the start of the screw tightening work, the rotating member 88 also rotates, and the claw member 116 is engaged with the spiral concavo-convex portion 106c by its centrifugal action. Then, since the rotating member 88 continues to rotate in this state, the spiral concavo-convex portion 106 is formed.
Due to the engagement relationship between c and the claw member 116, the operation member 106 is relatively moved in the axial direction on the driven shaft 86 in a screw feed manner. During this time, the operating member 106 is the O-ring 108.
The rotation is stopped by the action of. The operation member is moved 106 until the pressing portion 106a reaches the rolling element 112, and when the clutch is engaged, the driven element 86 starts to rotate and the operation member 106 also rotates. The relative movement of 106 in the axial direction stops, and the clutch engagement state is maintained. In this way, the clutch mechanism 76 can automatically return to the clutch engagement state at the start of the screw tightening work by the automatic return mechanism 78.

Next, the holding mechanism 80 will be described with reference to FIGS. 4 and 6. Locking ring 46 and driver body 1
The slider 120 having the end portion of the operation rod 50 attached thereto is inserted into the space between the outer peripheral surface of the slider 0 and the outer peripheral surface so as to be movable in the axial direction, and the compression coil spring 122 is inserted between the slider 120 and the locking ring 46. Has been done. Driver body 1
No. 0 has a through hole 124 formed therein, in which a spherical rolling element 126 is housed, and is slid on the outer peripheral surface of the driver body 10 by the pressing portion 46a of the locking ring 46 on the outside. Protrusion is suppressed by the operating ring 128 that contacts. The operation ring 128 is a compression coil spring 130.
Is biased toward the original position shown in FIG. 4 and is held against the spring bias by an appropriate stopper (not shown).

When the operation member 54 is pushed down as shown in FIG. 2 at the start of the screw tightening work, the operation causes the operation rod 50 to move the slider 120 to the right in FIG. 4 to compress the spring 122. . As a result, the rolling element 126 in which the pressing portion 46a of the locking ring 46 is partially exposed.
Continue to apply inward pressing force to. In this state, when the nose member 14 is retracted to the retracted position together with the slide member 24 by the rotation of the driver bit 12 and the operation of the nose member moving mechanism 74 corresponding to this, FIG.
As indicated by, the slide member 24 retracts the operation ring 128 from the original position against the spring 130, and causes the recess 132 formed on the outer peripheral surface of the sleeve wall 24a of the slide member 24 to correspond to the rolling element 126. As a result, the rolling element 126 is partially engaged with the recess 132 by the urging force of the pressing portion 46a. Along with this, the locking ring 4
6 rapidly moves to the locking position where it abuts against the projecting edge 10b of the driver body 10 shown in FIG. 6 by the bias of the spring 122, and the lower end locking portion 46b prevents the rolling element 126 from protruding upward. The rolling element 126 is restrained in the engagement state with the recess 132. Therefore, the slide member 24 and the nose member 14 are securely held in this retracted position during the screwing operation of the driver.

When the screwing operation of the driver is completed and the operation member 54 (FIG. 2) is released, the operation rod 50 correspondingly returns the locking ring 46 to the original position of FIG. 4 and the locking portion 46b is released. It comes off from the rolling element 126, and instead, the pressing portion 46.
a is located again. As a result, the rolling element 126 has the recessed portion 1 depending on the action of the slide member 24 returning in the protruding direction.
It escapes from 32 and the holding state is eliminated. As a result, the operation ring 128 also returns to the original position and returns to the state of FIG.

The edge of the groove of the recess 132, particularly the left edge in FIG. 6, in other words, the edge 132a on the side that directly contacts the rolling element 126 for engagement / disengagement is tapered as shown. As a result, when the rolling element 126 escapes, the tapered surface can give a larger component force in the escape direction to the rolling element 126, so that a smooth switching operation is performed. In the same sense, the pressing portion 46a of the locking ring 46 has a tapered edge.

Next, the screw feeding operation of the screw supply mechanism 18 shown in FIGS. 1 and 2 will be described with reference to FIGS. Corresponding to each feed wheel 60, a feed actuating lever 62 is rotatably supported by a support shaft 134 on a slide member 24 at a proximal end thereof, and is urged clockwise by a spring 136 in the drawing, and the slide member 2
It is held against the spring 136 by a stopper 138 provided on the upper part of the table 4. A plurality of ribs 140 are radially provided integrally with the feed wheel 60 on the side of the feed wheel 60 by the number of feed pitches (six in the embodiment), and one engaging surface has a substantially mountain shape or V-shaped first and second inclined surfaces 140a and 140b are formed. The roller 141 at the end of the actuating lever 62 is engaged with the inclined surfaces 140a and 140b.

In the initial feeding position shown in FIG. 7, the roller 142 corresponds to the first inclined surface 140a, and the relative movement between the nose member 14 and the slide member 24 causes the roller 142 to move.
While the roller 142 presses the first inclined surface 140a, the wheel 60 is rotated in the clockwise direction (feed direction) indicated by the arrow. During this time, the lever 62 contacts the stopper 138 to move the roller 142 in a straight relative direction parallel to the axis XX. As the rotation of the wheel 60 progresses, the roller 14
In the case of No. 2, the correspondence naturally shifts from the first inclined surface 140a to the second inclined surface 140b, and the state goes toward the inside of the rib 140 in the radial direction, and the feed for one pitch shown in FIG. The next upper screw 20 is set at the feed position along the axis XX.

Since the inclined surfaces 140a and 140b are formed in this way, the direction of action of the reaction force from the rib 140 on the roller 142 always passes in the vicinity of the support shaft 134 of the lever 62. Lever 62 during the feeding operation
Does not move against the spring 136 in a direction away from the engagement with the rib 140.

After the feed for one pitch is completed, the nose member 14
In the returning operation in which the roller relatively moves in the direction away from the slide member 24, as shown in FIG. 9, the roller 142 slides on the surface 140c on the opposite side of the adjacent next rib 140 and resists against the spring 136. While rotating in the clockwise direction, it escapes and operates so as to come off the rib 140, and corresponds to the next rib 140 at the initial position shown in FIG. 7. During this time,
The wheel 60 is restrained in the reverse rotation direction by the reverse rotation prevention 64, and holds the screw 20 set at the feed position at that position.

A pair of reverse rotation preventing claws 64 are provided corresponding to each wheel 60, and as shown in FIG.
The spring 1 is rotatably supported by the upper support shaft 142 and
It is urged in one direction (clockwise in FIG. 10) by 44, so that one arm 64a of the bifurcated shape is applied to each wheel 6
The toothed wheel 146, which is integrally provided on the side surface of No. 0, is elastically engaged. The number of teeth around the wheel 146 is equal to the pitch of the wheel 60 (6 in the embodiment).
), Correspondingly provided. As the wheel 146 rotates during the feeding operation, the arm 64a of the pawl 64 overcomes the teeth against the spring 144 and returns to the engaging position of the wheel 146 again. In the state where the one-pitch feed operation is completed, the arm 64a is placed in the proximity position immediately after overcoming the corresponding tooth on the wheel 146 as shown in FIG. It is blocked by contact with 64a.

The other arm 64b of the reverse rotation preventing claw 64 prevents the feed wheel from rotating too far beyond a predetermined pitch. Although the reverse rotation direction is blocked as described above, for example, when the feed wheel 60 is rotationally driven by one pitch by the relative movement operation of the nose member 14 and the slide member 24, the wheel 60 becomes particularly abrupt. If the screw is rotated, it may rotate more than 1 pitch due to inertia or the like, and the screw may not be accurately set at the feed position. In order to prevent this, the reverse rotation preventing claw 64 is further provided with an arm 64b. When the wheel 60 is rapidly rotated in the feeding direction indicated by the arrow, the toothed wheel 146 that rotates integrally with this is engaged. One arm 64a doing
Against the spring 144, as shown by the chain line, the reverse rotation preventing claw 64 is rotated more counterclockwise than in the normal state. The other arm 64b is set in such a positional relationship that it does not enter the locus of the teeth of the toothed wheel 146 during a normal slow feeding operation. As shown by, the state enters the locus and comes into contact with the corresponding tooth. Since this rotational position is made to coincide with the one-pitch feed completed state, when the wheel 60 tries to rotate too much, the other arm 64b is prevented from coming into contact with the teeth.

The relative movement of the three members of the nose member 14, the slide member 24, and the driver body 10 in a series of screw tightening operations in the automatic screw tightener configured as described above will be collectively described below.

In the state immediately before the start of the screw tightening work or the unused state, the screw tightener has the nose member 14 at the most projecting position as shown in FIG. It is in a fixed state. When the screw tightening work is started from this state, the nose member moving mechanism 74 is operated to operate the nose member 1.
4 is pulled in from the most projecting position as the retracting stroke of the first stage, and the concave portion 38 forms the rolling element 32 as shown in FIG.
In the stroke A up to the position (intermediate position) shown in FIG. 5, the screw feeding mechanism 18 feeds the screw by one pitch. Then, here, the nose member 14 and the slide member 24 are fixed to each other by the switching operation of the cooperation mechanism 26 and further retracted as a unit, and the rolling element 126 of the holding mechanism 80 engages with the recess 132 of the slide member 24. The retracting operation ends at the position (retracted position). During this period, both members 14 and 24 are further retracted by stroke B shown in FIG. 6 as the retracting stroke of the second stage. On the other hand,
Since the driver bit 12 is only rotated with respect to the driver body 10 and is fixed in the direction of the axis X-X, the tip end portion of the nose member 14 as shown in FIG. Since the screw 20 is exposed in a longer protruding state, the screw 20 held at the tip portion can be easily tightened at a portion having irregularities such as a deep hole as shown in FIG.

[0045]

As described above, according to the present invention, the slide member is arranged between the nose member and the driver main body, and the relative movement and fixing of these three members in the axial direction are selectively performed by the cooperation means. In addition, since the driver bit can be made to project without being restricted by the nose member and the related mechanism by the two-step retracting operation, the portion where the screw tightening is to be carried out is uneven such as deep holes. The screw can be easily introduced even at a certain place to perform the screw tightening work, and various effects such as small size, light weight, and excellent workability are exhibited.

[Brief description of drawings]

FIG. 1 is an automatic screw provided with a slide mechanism according to the present invention.
It is a longitudinal cross-sectional view of the tip part of one Example of a fastener.

FIG. 2 is an overall external view showing the automatic screw tightening machine shown in FIG. 1 in a screw tightening operation state in which a driver bit is projected.

3 is an axial line X- of the driver bit at the tip shown in FIG.
FIG. 3 is a vertical sectional view taken along line XIII-XIII.

FIG. 4 is an enlarged vertical sectional view of a central portion of the automatic screw tightener shown in FIG.

FIG. 5 is an operation explanatory view corresponding to FIG. 1 showing the nose member in the intermediate position.

FIG. 6 is an operation explanatory view of the main part of the automatic screw tightening machine shown with the nose member in the retracted position together with the slide member.

FIG. 7 is a longitudinal sectional view of an essential part of an automatic screw tightening machine showing an initial operation of a screw supply mechanism.

FIG. 8 is a view corresponding to FIG. 7 showing a feeding completion operation of the screw supply mechanism.

FIG. 9 is a view corresponding to FIGS. 7 and 8 showing the returning operation of the screw supply mechanism.

FIG. 10 is a schematic diagram of a rotation control mechanism of a feed wheel in the screw supply mechanism.

11 is a transverse cross-sectional view taken along line 11-11 of FIG.

12 is a cross-sectional view taken along line 12-12 of FIG.

13 is a transverse sectional view taken along line 13-13 of FIG.

[Explanation of symbols]

 10 Driver Main Body 12 Driver Bit 14 Nose Member 18 Screw Supply Mechanism 24 Slide Member 26 Cooperating Mechanism 32 Rolling Element 34 Through Hole 36 Recess 38 Recess 74 Nose Member Moving Mechanism 76 Clutch Mechanism 78 Automatic Return Mechanism 80 Holding Mechanism

Claims (2)

[Claims] Claim: What is claimed is: 1. A driver main body provided with a driver bit that is rotationally driven, screw supply means for supplying a screw mounted and supported on a connecting band onto the axis of the driver bit, and a screw provided on the axis of the driver bit. A nose member having chucking means for holding the slide member, and a slide supporting the nose member slidably along the axis of the driver bit and slidably supported relative to the driver body. Member and a nose member moving means for moving the nose member between a most projecting position that projects most outward from the driver body and a retracted position that moves inwardly of the driver body. In the tightening machine, when the nose member is at the most projecting position, the slide member is fixed to the driver body, and the nose member and the slide member are The nose member is moved relative to the slide member by a predetermined distance from the most projecting position, and both members are fixed at the intermediate position and the fixation of the slide member to the driver body is released. , A nose member, a slide member, and a driver main body, and a cooperation means for selectively fixing and releasing the three members together, and a slide mechanism for an automatic screw tightener. 2. The driver main body has a sleeve-shaped inner peripheral surface, and the slide member has a sleeve wall slidably contacting the sleeve-shaped inner peripheral surface of the driver main body and slidable in the axial direction of the driver bit. The nose member has a sleeve-shaped peripheral surface which is slidably in contact with the inner peripheral surface of the sleeve wall of the slide member and is slidable in the axial direction of the driver bit;
The rolling member housed in the through hole formed in the sleeve wall of the slide member, and the recesses formed in the sleeve-like inner peripheral surface of the driver body and the sleeve-like outer peripheral surface of the nose member respectively; At the time of relative movement of the member, the slide member, and the driver main body, a part of the rolling element engages / disengages with the recess,
The slide mechanism according to claim 1, wherein fixing and releasing between these three members are selectively performed in cooperation with each other.