JP2816504B2 - Continuous screw tightening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous screw tightening machine for continuously feeding and screwing each screw attached to a screw connection band.

[0002]

2. Description of the Related Art Generally, a continuous screw tightening machine of this type includes a main body having a built-in drive motor, a driver bit drive shaft protruding from the main body and rotated by the drive motor, and attached to the main body. A case having a longitudinal direction in the axial direction of the driver bit driving shaft, a moving member slidably mounted in the case in the longitudinal direction of the case, and a screw provided at the moving member and having an end screwed in. A contact member that is pressed against the object to be tightened, and a spring that biases the moving member in a direction in which the contact member protrudes from the distal end of the case. And a screw supply device for sequentially feeding each screw of the screw connection band to a screw tightening position by a driver bit attached to a driver bit drive shaft.

By the way, such a continuous screw tightening machine is provided with a screw-in depth adjusting device for regulating a limit of movement of a contact member in a direction opposite to a projecting direction in order to adjust a screw-in depth. As such a screw-in depth adjusting device, as shown in Japanese Utility Model Laid-Open Publication No. 62-12779 and Japanese Utility Model Publication No. 62-92165, a nut is screwed into an outer peripheral portion of a connecting portion between a case and a main body. A configuration in which the vertical position of the lever nut is variable and a pin that can abut on the lower surface of the nut on the upper side of the moving member, or screwed into the upper part of the case as shown in U.S. Pat.No. 4,059,0343. There has been proposed a configuration in which a pin capable of contacting a moving member is protruded from a lower surface of a nut to be moved.

In a continuous screw tightening machine of this type, the length of a screw which is provided at an end of a moving member and which applies the height of a contact member pressed against an object to be screwed into which a screw is to be screwed is applied. In order to enable a tightening operation in accordance with the screw length by changing the contact length, a configuration has been proposed in which the contact member is attached to the moving member so that the height can be adjusted.

[0005]

However, when a structure for adjusting the height of the abutting member is adopted in the above-described conventional continuous screw tightening machine, the moving member is set in the direction opposite to the direction in which the moving member protrudes. moving distance are the invariable irrespective of the height of the contact member, must be significantly effected the rotational adjustment of the nut for each screw length is changed to apply, has the operability is poor drawbacks I was Further, since the nut for adjusting the screwing depth is screwed onto the outer periphery of the connection portion between the case and the main body, there is a disadvantage that the case and the main body are elongated by the amount of the nut and the screw with which the nut is screwed. Was.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, a continuous screw tightening machine according to the first aspect of the present invention includes a main body having a built-in drive motor, and a main body protruding from the main body and rotated by the drive motor. A driver bit drive shaft to be driven, a case attached to the main body and having a longitudinal direction in the axial direction of the driver bit drive shaft, and a moving member slidably mounted in the case in the longitudinal direction of the case. A contact member attached to the moving member so as to be position-adjustable according to the length of the screw to be applied, and an end portion pressed against an object to be screwed into which the screw is to be screwed; A spring for urging the member to protrude from the front end of the case; and a driver bit drive provided on the moving member for driving each screw of the screw connector in association with the movement of the moving member. A screw feeder that sequentially feeds the screw to a screw tightening position by a driver bit attached to a shaft, wherein the case and the abutting member protrude from the abutting member by mutual abutting. A locking portion for restricting a screwing depth by restricting a movement limit in a direction opposite to the direction is provided, and the locking portion on the case side has a longitudinal direction in an axial direction of the driver bit driving shaft, and is provided at a lower end. A screw member having a contact portion of the contact member with the locking portion, the screw member being screwed to an adjust nut provided rotatably on the case to rotate the adjust nut; moving the has become possible lifting and lowering, and characterized in that further said moving member is provided <br/> the stopper path for locking the side of the protruding direction opposite direction in the abutting member a predetermined adjustment position I do.

A continuous screw tightening machine according to a second aspect of the present invention includes a main body having a built-in drive motor, a driver bit drive shaft protruding from the main body and rotated by the drive motor, and attached to the main body. A case having a longitudinal direction in the axial direction of the driver bit drive shaft, a moving member slidably mounted in the case in the longitudinal direction of the case, and the moving member according to a length of a screw to be applied. An abutting member whose end is pressed against an object to be screwed into which a screw is to be screwed, and a biasing member for urging the moving member in a direction in which the abutting member protrudes from a tip end of the case. And a screw provided on the moving member, the screw being connected to the movement of the moving member and being screwed by a driver bit attached to the driver bit driving shaft. And a screw supply device for sequentially feeding the screw to the attachment position, wherein the case and the contact member are mutually abutted to restrict a movement limit in a direction opposite to a projecting direction of the contact member. Locking portions for restricting the screw-in depth are provided, and the locking portions on the case side are axes perpendicular to the axial direction of the driver bit drive shaft by rotating an adjustment knob provided on the case. A polygonal plate rotatable around the polygon plate, each side of the polygonal plate having a different height with respect to the locking portion of the abutting member in a direction parallel to an axial direction of the driver bit driving shaft. is configured to be facing, further wherein the moving member is characterized in that said abutment member Ke a set <br/> the stopper path for locking the side of the protruding direction opposite direction at a predetermined adjustment position.

[0008]

[Action] In the present invention of claim 1, since it is intended to regulate the abutment of the mutual engagement portion provided with the screw-in depth in the case side and the abutment member, when changing the position with respect to the moving member of the contact member The moving stroke of the moving member changes accordingly, and the shorter the distance between the moving member and the contact member, the shorter the moving stroke. Also, fine adjustment of the fine adjustment i.e. moving stroke of the abutting position of such locking portion mutually the adjustment nut provided in the case and the rotating operation, thereby elevating movement of the threaded body is a locking portion of the case side That can be done. Further, since the moving member <br/> stopper path for locking the side of the protruding direction and the direction opposite the contact member in a predetermined adjustment position is provided, the positioning work just the contact member to the stopper Pas The positioning can be easily performed by abutting.

According to the second aspect of the invention, similarly to the first aspect of the invention, if the position of the contact member with respect to the moving member is changed,
The moving stroke of the moving member changes accordingly. In particular, the adjustment knob provided fine adjustment i.e. fine adjustment of the movement stroke of the contact position of the locking portion mutually case rotationally operated to rotate the polygon plate is engaging member of the case side, the desired This can be performed by making the side face the engaging portion of the contact member. Further, since the stopper path for locking the side of the protruding direction and the opposite direction at a predetermined adjustment position the abutment member to the moving member is provided, the positioning operation to just abut the abutment member stopper Pas Positioning can be easily performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be specifically described below with reference to the drawings. The continuous screw tightening machine shown in a longitudinal sectional view in FIG. 1 has a hollow main body 10 that can be divided into two parts vertically, and a motor 12 is arranged inside the main body 10 in a horizontal state. One end of the armature shaft 14 of the motor 12 is provided at one end by a bearing 16 disposed on one end side of the main body 10 in the longitudinal direction.
The bearings 18 are respectively supported by bearings 18 disposed near the other end of the reference numeral 0. A connection cord 20 for connecting to a power source (not shown) is attached to a lower portion of one end of the main body 10, and the connection cord 20 is electrically connected to the motor 12 via a switch 22.

Meanwhile, in the other end portion of the main body 10 is arranged a gear clutch mechanism 26 for transmitting the rotation of the armature shaft 14 in the de Raibabitto drive shaft 24, the driver bit drive shaft 24 of the motor 12 The main body 10 is disposed so as to be substantially perpendicular to the armature shaft 14, and is attached so as to partially protrude from the lower portion on the other end of the main body 10.

A gear / clutch mechanism 26 is disposed in the main body 10 in a vertical direction, and has a first gear shaft 32 whose upper and lower ends are supported by bearings 28 and 30, respectively, and is arranged in parallel with the first gear shaft 32. It has a second gear shaft 38 whose upper end is supported by the needle bearing 34 and the thrust needle bearing 36 and whose lower end is loosely fitted in a bottomed shaft hole 24 a formed in the upper part of the driver bit drive shaft 24. I have. A bevel gear 42 meshing with a bevel gear 40 fixed to the end of the armature shaft 14 and a small gear 44 made of a spur gear are fixed to the first gear shaft 32 at lower and upper positions, respectively. A large gear 48 meshing with the small gear 44 is fixed to the second gear shaft 38, and clutch teeth 50 are formed on the lower surface of the large gear 48.

The upper portion of the driver bit drive shaft 24 is rotated with respect to an annular boss 52 projecting inside the main body 10 via an oilless bearing 54 attached to the inner peripheral surface of the boss 52. The lower part is loosely fitted to an annular boss 53 protruding out of the main body 10. At the upper end of the driver bit drive shaft 24, a flange portion 24b locked to the upper end surface of the boss portion 52 is integrally formed. This flange 2
4b is located opposite to the large gear 48 and has on its upper surface clutch teeth 56 which can engage with the clutch teeth 50 of the large gear 48.
have. The clutch teeth 50 and 56 are configured such that, in a torque transmitting state, that is, in a meshing state, when the transmitted torque exceeds a predetermined value, the clutch gears 50 and 56 slide mutually and the large gear 48 idles with respect to the driver bit drive shaft 24.

The shaft hole 2 of the driver bit drive shaft 24
A shaft hole 38a for receiving the compression coil spring 58 is formed at an end of the second gear shaft 38 loosely fitted in the inside of the shaft hole 24a.
And the bottom of the shaft hole 38a so as to always urge the driver bit drive shaft 24 downward, so that the clutch teeth 56 are normally disengaged from the clutch teeth 50 of the large gear 48 as shown. Have maintained.

Further, a bottomed shaft hole 24c for mounting a driver bit 60 indicated by an imaginary line in FIG. 1 is formed below the driver bit drive shaft 24, and a boss portion of the main body 10 is formed. An annular groove 62 is provided on the outer surface facing 53.
A steel ball 66 for locking the driver bit 60 is urged toward the shaft hole 24c by a leaf spring in a communication hole 64 that radially connects the annular groove 62 and the shaft hole 24c. It is installed in.

As shown in FIG. 2, the main body 10 has a constricted shape near the other end from the center in the longitudinal direction in a plan view, and the upper part of the other end is a grip portion for the operator. As shown in FIG. 2, the grip portion 67 has a substantially partial circular shape in plan view, and has a rounded upward protruding shape as partially shown in FIG. Gripping is easy,
The center of the holding portion 67 substantially coincides with the axis of the second gear shaft 38 , that is, the axis of the driver bit drive shaft 24.

As shown in FIG. 3, a hollow case 68 having a rectangular shape in a plan view and having open upper and lower ends is formed on the lower surface of the main body 10 from which the driver bit driving shaft 24 protrudes. A flange portion 70 fitted around the boss portion 53 is integrally formed. As shown in FIG. 3, the case 68 has a portion 68a corresponding to one short side formed separately from the other portion. Are fixed by screws 69, 69. When the case 68 is attached to the main body 10, the long side of the rectangle is substantially parallel to the longitudinal direction of the main body 10 as shown in FIGS. It is eccentric with respect to the axis. As shown in FIG. 4, a pair of flange portions 72 are integrally formed on the opposite side of the upper end of the case 68, and the case 68 is fixed to the lower surface of the main body 10 by screws 74 inserted through these flange portions 72. It is fixed to.

A moving member 76 is mounted inside the case 68 so as to be vertically slidable. The moving member 76 is vertically divided into two parts as shown in FIG. 3, and these divided parts are mutually positioned by positioning pins 76a, 76a and fixed by screws 80 as shown in FIG.

A circular recess 79 for receiving one end of a compression coil spring 78 is provided on the upper surface of the moving member 76 at a position facing the driver bit drive shaft 24 and the boss 53.
Are formed. The other end of the compression coil spring 78 is externally inserted into the boss 53 and abuts against the lower surface of the main body 10, and the moving member 76 is constantly urged downward by the compression coil spring 78. Further, an insertion hole 81 of the driver bit 60 is provided through the center of the recess 79 (see FIG. 3).

The side plates 68b, 68c on the long side of the case 68
6, elongated holes 82 in the vertical direction are formed at portions facing each other. These slots 82
It is restricted to a corresponding head portion of the bolt 84 screwed respectively have entered the side surfaces, the range the range of vertical movement of the length of the long hole 82 of the moving member 76 of the moving member 76 in. As described above, the moving member 76 is constantly urged downward by the compression coil spring 78, and usually, the head of the bolt 84 is locked to the lower end of the elongated hole 82 as shown in FIG. It is held in the lowered position.

As shown in FIG. 4, the moving member 76 has forked legs 86 and 88 for forming a gap therebetween in a direction parallel to the long side of the case 68. The gap is a ratchet wheel 94 having a pair of left and right ratchet wheels 92, 92 provided with a plurality of claws 90 to 90 at an equal pitch on the outer periphery.
Is formed. The legs 86 and 88 are shown in FIG.
As shown in the figure, the lower portion is thick so as to form guide surfaces 93, 93 for guiding both sides of the screw connection band B along the outer periphery of the lower portions of the ratchet wheels 92, 92 on the corresponding sides of the ratchet wheel 94. Has made. As shown in FIG. 1, a plurality of screws S to S are attached at equal pitches to the screw connection band B, and the claws 90 to 92 of the ratchet wheels 92 on each side are provided on both sides thereof at the same pitch. A plurality of grooves (not shown) with which the 90 is engaged are formed. The pitch of the claws 90 to 90 is set equal to the pitch of the groove of the screw connection band B, and the screw connection band B moves from the inlet 95 to the outlet 97 with the rotation of the ratchet wheel 94 in the direction of the arrow in FIG. It is sequentially movable along the guide surfaces 93, 93.

The shaft 94a of the ratchet wheel 94 is pivotally supported at its ends by legs 86 and 88. A ratchet 9 is provided on the side of the ratchet wheel 94 adjacent to the upper part of one ratchet wheel 92.
A stopper 98 for locking 0 to 90 is pivotally supported via a pin 100. The stopper 98 is always engaged with the pawl 90 by a leaf spring 101 supported in a cantilever manner above a ratchet wheel 92. Has been energized. Further, a roller pin 104 is protruded from the outer peripheral portion of the side surface of the ratchet wheel 94 via ratchet means (not shown). As shown in FIG. 6, the roller pin 104 is attached to the leg 86 on the corresponding side by the pawls 90 to 90 adjacent to the ratchet wheel 94.
It projects into a curved elongated hole 106 formed in the circumferential direction in an angular range substantially coincident with the mutual angular interval, and into a substantially L-shaped elongated hole 108 formed in the side plate 68c of the case 68.

The elongated hole 108 extends in the vertical direction, that is, the case 68.
And a second portion 108 extending obliquely downward from a lower portion of the first portion 108a.
b. The roller pin 104 moves the moving member 76 in a state where the moving member 76 is located at its lower limit.
Of the leg 86 and the lower part of the second portion 108b of the elongated hole 108 of the case 68, and the moving member 76 moves upward against the urging force of the compression coil spring 78. As a result, the inside of the elongated hole 106 is guided from the one end to the other end by being guided by the second portion 108b, and reaches the other end of the elongated hole 106 when reaching the first portion 108a. Thereby, the ratchet wheel 94 is rotated in the direction of the arrow in FIG. 1 by an angle corresponding to the angular interval between the adjacent claws 90 to 90 of the ratchet wheel 92 via the ratchet means,
The stopper 98 gets over the next claw 90 and reaches the opposite side in the rotation direction. Next, when the moving member 76 descends and the roller pin 104 moves downward along the second portion 108b of the elongated hole 108, the ratchet wheel 94 is moved to the stopper-9.
8 prevents rotation in the reverse direction, so that the claw 90 is kept rotated by one pitch.

Accordingly, the screw connection band B is fed by one pitch of the screw S with the vertical movement of the moving member 76.

An adjust nut 110 for adjusting the screwing depth of the screw S is attached to a portion of the case 68 close to the upper end of one corner portion so as to protrude partially outside. The adjusting nut 110 is provided on a support wall 112 formed inside the upper end of the corner of the case 68.
Is mounted in a horizontal mounting hole 114 provided in the main body. A stopper plate 116 having a substantially rectangular cross section is screwed into the inner peripheral surface of the adjust nut 110 on the short side. This stopper plate 116 is the case 6
8 is slidably guided in a vertical direction by a corresponding rectangular groove 118 formed between the corner portion of the case 8 and the support wall 112, and the long side surface is a side plate 68b of the case 68 as shown in FIG. Is in sliding contact with A lower portion of the stopper plate 116 is guided by a groove 120 corresponding to the groove 118 formed between the moving member 76 and the case 68, and the groove 120 is formed to penetrate vertically.

On the upper surface of the adjust nut 110, three recesses 119 are formed at equal intervals in the circumferential direction, and the support wall 1 facing the upper surface of the adjust nut 110 is formed.
The ball 121 accommodates a ball 121 which can be engaged with the recess 119 together with a spring 123 which biases the ball 121 toward the upper surface of the adjustment nut 110. The engaging nut 110 can be positioned by adjusting the adjusting nut 110.

At the lower ends of the legs 86 and 88 of the moving member 76, an L-shaped contact member 122 is attached, the lower surface of which is in contact with the work W to be screwed. The contact member 122 has a structure in which two L-shaped contact pieces 124 and 126 are joined to each other at an end of a horizontal portion, and allows the screw S to be inserted between the contact pieces 124 and 126. A groove 127 is formed. Vertical holes 128 are formed in the vertical direction of the contact pieces 124 and 126, respectively.
8 and are fixed by screws 130 respectively.
The mounting height of the contact member 122 with respect to the moving member 76 depends on the length of the screw S of the screw connection band B to be applied.
It is variable by changing the engagement position with respect to the long hole 128 of 30. In this embodiment, each leg 86,
Pins 134 and 136 are protruded above a screw hole 132 into which the screw 130 of 88 is screwed. As shown in FIGS. 1 and 4, the upper ends of the contact pieces 124 and 126 are
4, a second position where the upper ends of the contact pieces 124 and 126 abut the lower ends of the pins 136, and a contact position 12.
Positions are possible at a third position where the upper ends of the fourth and fourth 126 abut against the lower surfaces of the steps 138 and 138 formed on the legs 76 and 78, respectively, and the first position, the second position, and the third position Is a screw S length of 40mm and 32mm respectively
And 25 mm. That is, the pin 13
4,136 and stepped portions 138 and 138 are first predetermined relative contact member 122 to the movable member 76, and has a stopper path for positioning the second and third position.

One contact piece 12 of the contact pieces 124 and 126
6 is provided with a stopper 140 at a position facing the stopper plate 116.
Reference numeral 40 denotes a member that contacts the lower end of the stopper plate 116 when the moving member 76 is moved upward with respect to the case 68 by pressing the lower surface of the contact member 122 against the workpiece W and regulates the screwing depth of the screw S. Adjust nut 11
By turning 0 to change the lower end position of the stopper plate 116, the screwing depth can be finely adjusted.

Next, the operation of the above embodiment will be described.
When the motor 12 is started by operating the switch 22, the rotation of the armature shaft 14 is transmitted to the first gear shaft 32 via the bevel gears 40 and 42, and the rotation of the first gear shaft 32 is transmitted via the small gear 44 and the large gear 48. And transmitted to the second gear shaft 38 in a reduced state. In this state, the clutch teeth 50 and 56 are not engaged, and the second gear shaft 32 idles.

Next, when the contact member 122 is pressed against the upper surface of the work W while the main body 10 is gripped from the upper surface by the grip portion 67, the moving member 76 moves upward in the case 68 against the spring 78. That is, it enters the case 68. With the movement of the moving member 76, the roller pin 104 of the ratchet wheel 94 is
The ratchet wheel 94 is rotated in a direction indicated by an arrow in FIG. 1 through the ratchet means by being guided by the second portion 108b of the long hole 108. Roller pin 104 is second
When reaching the upper end of the portion 108b, the ratchet wheel 9
4 is the guide surface 9 of the ratchet wheel 94 and the moving member 76
3 and 93, the screw connecting band B
The driver bit 60 is moved by an amount corresponding to the pitch.
, The next screw S adjacent to the screw S located below the insertion hole 81 of the driver bit 60 formed in the moving member 76 is moved to a position below the driver bit 60. (After the screw connection band B is moved in this manner, the position is maintained until the moving member 76 is pushed upward again, as described above.)

After the screw connection band B moves, the moving member 76
Is further inserted into the case 68, the driver bit 60 passes through the insertion hole 81 of the moving member 76 and abuts and engages with the screw S located therebelow, thereby disengaging the screw S from the screw connection band B downward. The tip is brought into contact with the work W.
When the driver bit 60 is further pressed against the work W, the driver bit drive shaft 24 moves upward against the urging force of the compression coil spring 58, and the clutch teeth 56
Are meshed with the clutch teeth 50, and the rotation of the second gear shaft 38 is transmitted to the driver bit drive shaft 24, and the rotation is given to the screw S to be screwed into the work W.

The moving member 76 further moves up inside the case 68, and the stopper portion 1 of the contact piece 126 of the contact member 122
When the lower end of the stopper plate 116 abuts on the moving member 40, the moving member 76 is prevented from further rising, and the screw S is screwed into the work W to a predetermined depth as shown in FIG.

When the pressing of the main body 10 through the gripping portion 67 is released after the screw S has been screwed in, the driver bit drive shaft 24 returns to the original position by the restoring force of the compression coil spring 58, and the clutch teeth 56 become the clutch teeth 50. The moving member 76 is returned to the original position by the restoring force of the spring 78, and one cycle of the screwing operation is completed.

The mounting height of the contact member 122 with respect to the moving member 76 can be changed by changing the engagement position of each screw 130 with the elongated hole 128 according to the length of the screw S of the screw connection band B to be applied. Has become. In this embodiment, as described above, the screw S can be attached to the first position, the second position, and the third position corresponding to the case where the length of the screw S is 40 mm, 32 mm, and 25 mm, respectively. At each position, the distance between the lower surface of the contact member 122 contacting the work W and the lower end of the screw S is the same, and the operation from the detachment of the screw S from the screw connection band B to the contact with the work W is always performed. It is performed in a constant state.

In this embodiment, the rising stroke of the moving member 76 is regulated by the contact between the stopper 140 of the contact member 122 and the lower end of the stopper plate 116. The shorter the length of the screw S becomes, the shorter the length of the screw S becomes in accordance with the mounting height to the moving member 76. Therefore, if the screwing depth of the screw S by the driver bit 60 is set to a desired value for one type of screw S by turning the adjustment nut 110, the screwing depth is always constant even when the length of the screw S used is different. You can get

Next, a second embodiment of the present invention will be described with reference to FIGS. The configuration other than that shown in the figure is the same as that of the first
The components are the same as those of the first embodiment, and the same members as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

A rotating member 144 integrally having an octagonal eccentric plate 142 is rotatably mounted to a mounting hole 145 at a lower portion of a case 68A corresponding to the case 68 of the first embodiment. The eccentric plate 142 is in sliding contact with the inner surface of the case 68A, and an adjusting knob 146 that is in sliding contact with the outer surface of the case 68A is fixed to the rotating member 144 via a screw 137 . A plurality of holes 148 are formed in the case 68A in a circumferential direction around the mounting hole 145. A ball 150 engageable with any of these holes 148 is formed on the adjustment knob 146 by a spring 152. It is mounted in a biased state toward.

Further, one contact member 1 of the contact member 122
On the upper surface of the horizontal portion 26, there is provided a contact plate 154 with which each side of the eccentric plate 142 contacts.
The position of each hole 148 of A is set such that each piece of the eccentric plate 142 abuts on the abutment plate 154 in a parallel state when the ball 150 is engaged. Ball 15
The height of each piece of the eccentric plate 142 facing the abutment plate 154 in each state in which the 0 is engaged is different from each other as partially shown by imaginary lines in FIG. The same operation as the stopper plate 116 can be performed.

[0039]

In the continuous screw tightening machine according to the first and second aspects of the present invention, if the position of the contact member with respect to the moving member is changed, the moving stroke of the moving member changes accordingly. When the distance is short, the moving stroke is short, so that the screwing depth can always be kept constant regardless of the length of the screw to be applied. For this reason, the operation of adjusting the moving stroke of the moving member according to the length of the screw to be applied becomes unnecessary, and the operability is improved. Further, it is possible to easily perform positioning in a predetermined position of the thus abutting member stopper path of the moving member, adjusting work can be simplified. Further, the fine adjustment of the movement stroke can be performed by rotating an adjustment nut provided on the case in the invention of claim 1, and the adjustment knob provided on the case can also be turned by turning the adjustment nut provided on the case in the invention of claim 2. Since the movement can be performed by performing a moving operation, the movement stroke is first adjusted by changing the position of the contact member with respect to the movement member, and then a two-stage adjustment operation in which fine adjustment is performed using an adjustment nut becomes possible. In particular, which the screw member is a locking portion of the the invention of claim 1 to rotate the adjustment nut for the fine adjustment case side is moved up and down, screwing structure of the screw member for such adjustment nut According to this, even when the engaging portion on the contact member abuts on the screw body at the limit of the movement stroke, the screw body is securely held at the adjustment position without moving due to the abutment. Therefore, the workability of the adjustment operation is improved and the adjustment accuracy is improved. Also, fine adjustment in the second aspect of the present invention rotates the polygon plate is engaged portion of the case side by rotating the adjustment knob, by facing the locking portion of the contact member the desired side According to such a locking structure using a rotating polygonal plate, the rotating shaft position is invariable at any of the adjustment positions, and the rotating shaft is simply rotatably supported with respect to the case. Since the position of the rotating shaft in the direction of the movement stroke with respect to the case is fixed, even if the locking portion of the abutting member abuts on any side of the rotating polygon plate in the movement stroke limit, the polygonal plate is in contact with the case. There is an advantage that the adjustment position can be reliably maintained without the position being moved by the contact, and thus the adjustment accuracy is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a continuous screw tightening machine according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a right side view showing the case shown in FIG. 1 together with a moving member, and is a partially broken view.

FIG. 5 is a right side view similar to FIG. 4 and shows a state in which the moving member is retracted to a position where the moving member is highest with respect to the case.

FIG. 6 is a front view showing the case shown in FIG. 1 together with a moving member.

FIG. 7 is a front view showing a case of a continuous screw tightening machine according to a second embodiment of the present invention together with a moving member.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Main body 12 Motor 24 Driver bit drive shaft 60 Driver bit 68, 68A Case 76, 76A Moving member 78 Compression coil spring 90-90 Claw 94 Ratchet wheel 110 Adjust nut 116 Stopper plate 122 Contact member 140 Stopper part 142 Eccentric plate 146 Adjust Knob 154 This plate B Screw connection band S Screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B25B 23/04 B25B 21/00

Claims (2)

(57) [Claims] 1. A main body having a built-in drive motor, a driver bit drive shaft protruding from the main body and driven to rotate by the drive motor, and a longitudinal direction attached to the main body and extending in the axial direction of the driver bit drive shaft. A case, a moving member slidably mounted in the case in the longitudinal direction of the case, and a positionally attached to the moving member depending on the length of a screw to be applied, and an end portion is provided. An abutting member pressed against a body to be screwed into which a screw is to be screwed, and a spring for urging the moving member in a direction in which the abutting member protrudes from a distal end of the case;
A screw supply device provided on the moving member, for sequentially feeding each screw of the screw connection body to a screw tightening position by a driver bit attached to the driver bit driving shaft in association with the movement of the moving member. A fastening machine, wherein the case and the contact member are provided with locking portions for restricting a movement limit in a direction opposite to a protruding direction of the contact member and restricting a screwing depth by mutual contact. The locking portion on the case side has a longitudinal direction in the axial direction of the driver bit driving shaft, and is configured by a screw body having a contact portion with the locking portion of the contact member at a lower end, The screw body is screwed to an adjust nut provided rotatably on the case, and can be moved up and down by the rotation of the adjust nut. Adjustment position Machine with continuous screw tightening, characterized in that a stopper path for locking the side of the protruding direction opposite the direction in. 2. A main body containing a drive motor, a driver bit drive shaft protruding from the main body and rotated by the drive motor, and a longitudinal direction attached to the main body and extending in the axial direction of the driver bit drive shaft. A case, a moving member slidably mounted in the case in the longitudinal direction of the case, and a positionally attached to the moving member depending on the length of a screw to be applied, and an end portion is provided. An abutting member pressed against a body to be screwed into which a screw is to be screwed, and a spring for urging the moving member in a direction in which the abutting member protrudes from a tip of the case;
A screw supply device provided on the moving member, for sequentially feeding each screw of the screw connection body to a screw tightening position by a driver bit attached to the driver bit driving shaft in association with the movement of the moving member. A fastening machine, wherein the case and the contact member are provided with locking portions for restricting a movement limit in a direction opposite to a protruding direction of the contact member and restricting a screwing depth by mutual contact. The locking portion on the case side is formed of a polygonal plate that can be rotated around an axis perpendicular to the axial direction of the driver bit driving shaft by rotating an adjustment knob provided on the case. Each side of the rectangular plate is configured to be able to face the locking portion of the contact member at a different height in a direction parallel to the axial direction of the driver bit drive shaft, and Machine with continuous screw tightening, characterized in that a stopper path for locking the side of the protruding direction opposite direction in the abutting member a predetermined adjustment position is the serial movement member.