JPH04289081A - Continuous screw tightening machine - Google Patents

Abstract

PURPOSE:To keep a screw constant in screwing depth at all times, regardless of the length of the screw, by regulating a screwing depth by mutual contact between engaging members installed on the case side and a contact member. CONSTITUTION:The rising stroke of a moving member 76 is regulated by a contact between the stopper 140 of a contact member 122 and the lower end of a stopper plate 116. The shorter the length of a screw S, the shorter the rising stroke becomes according to the installation height for the moving member 76 of the contact member 122. If the screw depth of one type of screw S through a driver bit 60 is set to a desired one by turning an adjusting nut 110, it is possible to always achieve a constant screwing depth even when the length of a used screw S is different from those of others.

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 screws attached to a screw connecting band.

0002

[Prior Art] Generally, this type of continuous screw tightening machine includes a main body containing a drive motor, a driver bit drive shaft that projects from the main body and is rotationally driven by the drive motor, and a driver bit drive shaft that is attached to the main body. a case having a longitudinal direction in the axial direction of the driver bit drive shaft; a moving member mounted within the case so as to be slidable in the longitudinal direction of the case; The movable member is provided with an abutting member that is pressed against an object to be tightened, and a spring that biases the movable member in a direction in which the abutting member protrudes from the tip of the case. In conjunction with this, the screw supply device sequentially feeds each screw of the screw connection band to a screw tightening position by a driver bit attached to a driver bit drive shaft.

[0003] Incidentally, such a continuous screw tightening machine is equipped with a screwing depth adjustment device that regulates the limit of movement of the abutting member in a direction opposite to the protruding direction in order to adjust the screwing depth of the screw. As shown in Japanese Utility Model Application Publication No. 62-12779 and Japanese Utility Model Application No. 62-92165, such a screw-in depth adjusting device has a nut screwed onto the outer periphery of the connecting portion between the case and the main body. The vertical position of the lever nut can be changed, and a pin that can come into contact with the lower surface of the nut is provided on the upper part of the moving member, or as shown in U.S. Pat. No. 4,059,0343, the upper part of the case is A structure has been proposed in which a pin that can come into contact with a moving member is provided protruding from the lower surface of a nut to be screwed together.

[0004] In this type of continuous screw tightening machine, the length of the screw is determined by the height of the abutting member provided at the end of the movable member and pressed against the object to be screwed. In order to enable a tightening operation according to the screw length by changing the height according to the length of the screw, a structure has been proposed in which the abutment member is attached to the movable member in a height-adjustable manner.

[0005]

[Problems to be Solved by the Invention] However, when a structure is adopted in which the height of the abutting member is adjusted in the configuration of the conventional continuous screw tightening machine described above, it is difficult to adjust the height of the movable member in the opposite direction to the protrusion direction set by the nut. Since the travel distance remains the same regardless of the height of the abutting member, it has the disadvantage of poor operability, as the rotation of the nut must be adjusted significantly each time the length of the applied screw changes. Ta. In addition, since the nut that adjusts the screw-in depth is screwed onto the outer periphery of the connecting part between the case and the main body, it has the disadvantage that the case and the main body become longer by the length of the nut and the thread into which the nut is threaded. Ta.

[0006]

[Means for Solving the Problems] In order to solve the problems of the prior art described above, the continuous screw tightening machine of the present invention includes a main body incorporating a drive motor, and a main body that protrudes from the main body and is rotationally driven by the drive motor. driver bit drive shaft,
a case attached to the main body and having a longitudinal direction in the axial direction of the driver bit drive shaft; a moving member mounted within the case so as to be slidable in the longitudinal direction of the case;
a contact member that is attached to the movable member so that its position can be adjusted according to the length of the screw to be applied, and whose end is pressed against the object to be tightened into which the screw is to be screwed; A spring biased in a direction protruding from the tip of the case, and a driver bit provided on the movable member to attach each screw of the screw connecting band to the driver bit drive shaft in relation to the movement of the movable member. A continuous screw tightening machine is provided with a screw feeding device that sequentially feeds screws to a screw tightening position, wherein the case and the contact member have a movement limit in a direction opposite to the protruding direction of the corresponding contact member due to mutual contact. A locking portion is provided for regulating the screwing depth by regulating the screwing depth, and at least one of these locking portions is configured to have a variable contact height with respect to the other locking portion.

[0007] Further, the locking portion whose contact height is variable is a screw body provided on the case side and having a contact portion with the locking portion of the contact member, and the screw Preferably, the contact position is variable by adjusting the body position.

[0008]

[Operation] In the continuous screw tightening machine of the present invention, since the screwing depth is regulated by the mutual contact of the engaging members provided on the case side and the abutting member, the position of the abutting member with respect to the moving member is limited. If this changes, the movement stroke of the moving member will change accordingly, and as the distance between the moving member and the abutting member becomes shorter, the movement stroke will also become shorter.

Further, by adopting a structure in which the contact position is adjusted by a screw body on the case side, the screwing depth can be accurately adjusted on the case side.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to the drawings. The continuous screw tightening machine shown in a vertical cross-sectional view in FIG. 1 has a hollow main body 10 that can be divided into upper and lower halves, and a motor 12 is disposed horizontally inside the main body 10. The armature shaft 14 of the motor 12 has one end mounted on a bearing 16 disposed on one end side in the longitudinal direction of the main body 10, and the other end is placed closer to the main body 1 than the longitudinal center of the main body 10.
0, respectively, are supported by bearings 18 disposed near the other end. A connection cord 20 to a power source (not shown) is attached to the lower part of one end of the main body 10, and the connection cord 20 is electrically connected to the motor 12 via a switch 22.

On the other hand, a gear/clutch mechanism 26 for transmitting the rotation of the armature shaft 14 to the driver bit drive shaft 24 is disposed within the other end of the main body 10, and the driver bit drive shaft 24 is connected to the motor. The armature shaft 12 is disposed substantially perpendicular to the armature shaft 14 of the main body 10, and is attached so as to partially protrude from the lower part of the other end of the main body 10.

The gear/clutch mechanism 26 is arranged vertically within the main body 10 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. The second gear shaft 38 has an upper end supported by a needle bearing 34 and a thrust needle bearing 36, and a lower end loosely fitted into a bottomed shaft hole 24a formed in the upper part of the driver bit drive shaft 24. There is. A bevel gear 42 that meshes with a bevel gear 40 fixed to the end of the armature shaft 14 and a small gear 44 consisting of a spur gear are fixed to the first gear shaft 32 at lower and upper positions, respectively. A large gear 48 that meshes 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 part of the driver bit drive shaft 24 rotates with respect to an annular boss portion 52 formed protruding inside the main body 10 via an oilless bearing 54 attached to the inner peripheral surface of the boss portion 52. The lower part of the main body 10 is loosely fitted into an annular boss portion 53 projecting from the outside of the main body 10. Driver bit drive shaft 2
A flange portion 24b that is engaged with the upper end surface of the boss portion 52 is integrally formed at the upper end of 4. This flange portion 24
b is located opposite the large gear 48, and has the large gear 4 on the top surface.
It has clutch teeth 56 that can mesh with eight clutch teeth 50. It should be noted that these clutch teeth 50 and 56 are configured in a torque transmitting state, that is, in mesh, so that when the transmitted torque exceeds a predetermined value, they mutually slip, causing the large gear 48 to rotate idly with respect to the driver bit drive shaft 24.

[0014] Also, the shaft hole 2 of the driver bit drive shaft 24
A shaft hole 38a for receiving a compression coil spring 58 is formed at the end of the second gear shaft 38 that is loosely fitted in the shaft hole 24a.
and the bottom of the shaft hole 38a, so that the driver bit drive shaft 24 is always urged downward, and its clutch teeth 56 are normally in a non-engaged state as shown in the figure with respect to the clutch teeth 50 of the large gear 48. Maintained.

Further, a bottomed shaft hole 24c is formed in the lower part of the driver bit drive shaft 24 for mounting the driver bit 60 shown in phantom lines in FIG. An annular groove 62 is provided on the outer surface facing 53.
is formed, and a steel ball 66 for locking the driver bit 60 is biased toward the shaft hole 24c by a leaf spring in a communication hole 64 that communicates the annular groove 62 and the shaft hole 24c in the radial direction. It is installed with.

As shown in FIG. 2, the main body 10 has a constricted shape closer to the other end than the central part in the longitudinal direction, and the upper part of the other end is a part to be held by the operator. 67, and this grip portion 67 is partially circular in plan view as shown in FIG. 2, and has a rounded upward protrusion as partially shown in FIG. Furthermore, the center of this gripping portion 67 substantially coincides with the axis of the second gear shaft 46, that is, the axis of the driver bit drive shaft 24.

As shown in FIG. 3, on the lower surface of the main body 10 from which the driver bit drive shaft 24 projects, there is a hollow case 68 that is rectangular in plan view and open at the upper and lower ends. A flange portion 70 that is 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, and a pair of portions 68a corresponding to one short side of the case 68 at two locations close to the upper and lower ends of the case 68. It is fixed by screws 69, 69. When the case 68 is attached to the main body 10, the long sides of the rectangle are substantially parallel to the longitudinal direction of the main body 10, as shown in FIGS. 1 and 3, and the center of the long side is aligned with the driver bit drive shaft 24. It is eccentric to the axis. As shown in FIG. 4, on opposite sides of the upper end of the case 68,
A pair of flange portions 72 are integrally formed, and the case 68 has screws 74 inserted through these flange portions 72.
It is fixed to the lower surface of the main body 10 by.

A moving member 76 is mounted inside the case 68 so as to be slidable up and down. The movable member 76 is vertically divided into two parts as shown in FIG. 3, and these divided parts are mutually positioned by positioning pins 78, 78 and fixed by screws 80 as shown in FIG.

A circular recess 79 is provided on the upper surface of the moving member 76 to receive one end of a compression coil spring 78 at a portion facing the driver bit drive shaft 24 and the boss portion 53.
is formed. The other end of the compression coil spring 78 is fitted over the boss portion 53 and abuts against the lower surface of the main body 10, and the moving member 76 is always urged downward by the compression coil spring 78. Furthermore, an insertion hole 81 for the driver bit 60 is provided in the center of the recess 79 (see FIG. 3).

Side plates 68b and 68c on the long side of the case 68
As shown in FIG. 6, elongated holes 82 in the vertical direction are formed at positions facing each other. These long holes 82
The heads of bolts 84 screwed into the corresponding side surfaces of the movable member 76 protrude into the holes, and the range of vertical movement of the movable member 76 is restricted to the range of the length of the elongated hole 82. As mentioned above, the moving member 76 is always urged downward by the compression coil spring 78, and normally, as shown in FIG. held in the lowered position.

As shown in FIG. 4, the moving member 76 has bifurcated legs 86 and 88 that form a gap 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 with a plurality of pawls 90 to 90 arranged at equal pitches on the outer periphery.
It forms a housing part. In addition, the legs 86 and 88 are shown in FIG.
As shown in FIG. 9, the lower part is thick-walled so as to form guide surfaces 93, 93 for guiding both sides of the screw connection band B along the lower outer periphery of the ratchet wheels 92, 92 on each corresponding side of the ratchet wheel 94. is doing. As shown in FIG. 1, a plurality of screws S to S are attached to the screw connecting band B at equal pitches, and on both sides thereof, claws 90 to 90 of the ratchet wheels 92, 92 on each side are attached at equal pitches. A plurality of grooves (not shown) with which the grooves 90 engage are formed. The pitch of the pawls 90 to 90 is set equal to the pitch of the grooves of the screw connecting band B, and the screw connecting band B moves from the inlet portion 95 to the outlet portion 97 as the ratchet wheel 94 rotates in the direction of the arrow in FIG. Information surface 9
It is possible to move sequentially along 3 and 93.

The shaft 94a of the ratchet wheel 94 has its ends pivotally supported by the legs 86 and 88. A pawl 9 is provided on the side near the top of one ratchet wheel 92 of the ratchet wheel 94.
A stopper 98 for locking 0 to 90 is pivotally supported via a pin 100, and this stopper 98 is always moved in the engagement direction with the pawl 90 by a leaf spring 101 supported in a cantilevered manner above the pawl wheel 92. is energized by Furthermore, a roller pin 104 is provided protruding from the outer peripheral portion of the side surface of the ratchet wheel 94 via a ratchet means (not shown). As shown in FIG.
It protrudes into a curved long hole 106 formed in the circumferential direction with an angular range substantially matching the mutual angular interval, and further into a substantially L-shaped long hole 108 formed in the side plate 68c of the case 68.

[0023] The elongated hole 108 is formed in the vertical direction, that is, in the case 68.
A first portion 108a extending in the longitudinal direction, and a second portion 108 extending obliquely downward from the lower part of the first portion 108a.
It consists of b. The roller pin 104 is connected to the movable member 76 when the movable member 76 is located at its lower limit.
The movable member 76 moves upward against the biasing force of the compression coil spring 78. As it does so, it moves within the elongated hole 106 from the one end to the other end while being guided by the second portion 108b, and when it reaches the first portion 108a, it reaches the other end of the elongated hole 106. As a result, the ratchet wheel 94 rotates through the ratchet means in the direction of the arrow in FIG. It reaches the opposite side in the direction of rotation. Next, when the movable member 76 is lowered and the roller pin 104 is moved downward along the second portion 108b of the elongated hole 108, the ratchet wheel 94 moves toward the stopper 98.
Since rotation in the opposite direction is prevented, the claw 90 is kept rotated by one pitch.

Therefore, the screw connecting band B is fed by one pitch of the screw S as the movable member 76 moves up and down.

An adjustment nut 110 for adjusting the screwing depth of the screw S is attached to a portion near the upper end of one corner of the case 68 so as to partially protrude to the outside. This adjustment nut 110 is attached to a support wall 112 formed inside the upper corner of the case 68.
It is mounted in a horizontal mounting hole 114 provided in the. A stopper plate 116 having a substantially rectangular cross section is screwed onto the inner peripheral surface of the adjustment nut 110 at its short side. This stopper plate 116 is
It is slidably guided in the vertical direction by a corresponding rectangular groove 118 formed between the corner portion of the case 68 and the support wall 112, and the long side surface is connected to the side plate 68b of the case 68 as shown in FIG. It is in sliding contact with the Further, the lower part of the stopper plate 116 is guided by a groove 120 corresponding to the groove 118 formed between the movable member 76 and the case 68, and this groove 120 is formed to penetrate in the vertical direction.

Further, three recesses 119 are formed on the upper surface of the adjustment nut 110 at equal intervals in the circumferential direction, and the support wall 1 facing the upper surface of the adjustment nut 110
12 accommodates balls 121 that can be engaged in these recesses 119 together with a spring 123 that urges the balls 121 toward the upper surface of the adjustment nut 110. The balls 121 fit into the three recesses. 119, the adjustment nut 110 can be positioned.

An L-shaped abutment member 122 is attached to the lower ends of the legs 76 and 78 of the moving member 76, the lower surface of which abuts against the workpiece W to be screwed. This abutting member 122 has a structure in which two L-shaped abutting pieces 124 and 126 are joined to each other at the ends of the horizontal portion, and allows a screw S to be inserted between the abutting pieces 124 and 126. A groove 127 is formed. Vertically elongated holes 128 are formed in the vertical portions of the contact pieces 124 and 126, respectively, and these elongated holes 128
8 and are fixed by screws 130, respectively. The mounting height of the contact member 122 with respect to the movable member 76 depends on the length of the screw S of the applied screw connection band B.
It is made variable by changing the engagement position of 30 with respect to the elongated hole 128. Note that in this embodiment, each leg 76,
Pins 134 and 136 are protruded above the screw hole 132 into which the screw 130 of 78 is screwed, and as shown in FIGS. 1 and 4, the upper end of each contact piece 124 and 126
4, a second position where the upper ends of the contact pieces 124 and 126 contact the lower ends of the pins 136, and
4, 126 can be positioned at a third position where the upper ends of the legs 76, 78 are in contact with the lower surfaces of steps 138, 138 formed on the legs 76, 78, respectively; The length of the screw S is 40 mm and 32
mm and 25 mm, respectively.

One of the contact pieces 124 and 126, 12
6 is provided with a stopper portion 140 at a portion facing the stopper plate 116, and this stopper portion 1
Reference numeral 40 is a member that comes into contact with the lower end of the stopper plate 116 when the moving member 76 is moved upward relative to the case 68 by pressing the lower surface of the contact member 122 against the workpiece W to regulate the screwing depth of the screw S. Adjustment nut 11 above
By turning 0 and changing 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 explained.
When the switch 22 is operated to start the motor 12, the rotation of the armature shaft 14 is transmitted to the first gear shaft 32 via the bevel gears 40, 42, and the rotation of the first gear shaft 32 is transmitted via the small gear 44 and the large gear 48. and is transmitted to the second gear shaft 38 in a decelerated state. In this state, the clutch teeth 50 and 56 are in a non-meshing state, and the second gear shaft 32 idles.

Next, when the abutting member 122 is pressed against the upper surface of the work W while the main body 10 is gripped from above by the gripping portion 67, the moving member 76 moves upward in the case 68 against the spring 78. In other words, it enters into the case 68. As the movable member 76 moves, the roller pin 104 of the ratchet wheel 94 moves toward the case 68.
By being guided by the second portion 108b of the long hole 108, the ratchet wheel 94 is rotated in the direction of the arrow in FIG. 1 via the ratchet means. The roller pin 104 is the second
When reaching the upper end of portion 108b, ratchet wheel 9
4 is the guide surface 9 of the ratchet wheel 94 and the moving member 76
3. Connect the screw connecting band B installed between 93 and 1 of the screw S.
Move the driver bit by an amount corresponding to the pitch and set the driver bit to 60.
The next screw S adjacent to the screw S located below, that is, 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 has been moved in this manner, it remains in that position until the moving member 76 is pushed upward again, as explained above.)

After the screw connecting band B has moved, as the moving member 76 further enters the case 68, the driver bit 60 passes through the insertion hole 81 of the moving member 76 and comes into contact with the screw S located below it. Then, the screw S is removed downward from the screw connecting band B, and its tip is brought into contact with the workpiece W. When the driver bit 60 is further pressed against the workpiece W, the driver bit drive shaft 24 moves upward against the urging force of the compression coil spring 58, and the clutch teeth 56
meshes with the clutch teeth 50, the rotation of the second gear shaft 38 is transmitted to the driver bit drive shaft 24, and the screw S is rotated and screwed into the workpiece W.

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

When the screw S is screwed in and the pressure applied through the grip portion 67 of the main body 10 is released, the driver bit drive shaft 24 returns to its original position due to the restoring force of the compression coil spring 58, and the clutch teeth 56 move into the clutch teeth 50. The movable member 76 disengages from the engagement with the spring 78, and the movable member 76 returns to its original position due to the restoring force of the spring 78, completing one cycle of the screwing operation.

Furthermore, the mounting height of the abutment member 122 with respect to the movable member 76 can be varied by changing the engagement position of each screw 130 with respect to the elongated hole 128 according to the length of the screw S of the applied screw connection band B. It has become. In this example, as explained earlier, the length of the screw S is 40 mm and 32 mm.
and 25mm, respectively, in the first position and second position.
position and a third position, and the distance between the lower surface of the contact member 122 that contacts the workpiece W and the lower end of the screw S is the same in each of these positions, and the screw connecting band B of the screw S is The operations from separation from the workpiece W to contact with the workpiece W are always performed in a constant state.

By the way, in this embodiment, the upward stroke of the moving member 76 is regulated by the contact between the stopper portion 140 of the abutting member 122 and the lower end of the stopper plate 116; Depending on the mounting height with respect to the moving member 76, the shorter the length of the screw S becomes. Therefore, by turning the adjustment nut 110 and setting the screwing depth of the screw S by the driver bit 60 as desired for one type of screw S, the screwing depth will always be constant even if the length of the screw S used is different. You can get the feeling.

Next, a second embodiment of the invention will be described with reference to FIGS. 7 and 8. Note that configurations other than those shown in the drawings are the same as in the first section above.
The same members as those in the first embodiment are designated by the same reference numerals and their explanations will be omitted.

A rotating member 144 integrally having an octagonal eccentric plate 142 is attached to the lower part of a case 68A corresponding to the case 68 of the first embodiment so as to be rotatable in a mounting hole 145. The eccentric plate 142 is in sliding contact with the inner surface of the case 68A, and an adjustment 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 147. A plurality of holes 148 are formed in the case 68A in the circumferential direction around the mounting hole 145, and a ball 150 that can be engaged with any of these holes 148 is attached to the adjustment knob 146 by a spring 152. It is attached in a biased state towards.

[0038] Also, one of the abutting members 122
A contact plate 154 is provided on the upper surface of the horizontal portion of the case 68, and each side of the eccentric plate 142 comes into contact with the contact plate 154.
The position of each hole 148 in A is set so that each piece of the eccentric plate 142 abuts the contact plate 154 in a parallel state when the ball 150 is engaged. ball 15
0 is engaged, the heights of the respective pieces of the eccentric plate 142 facing the contact plate 154 are different, as partially shown by imaginary lines in FIG. The same function as the stopper plate 116 can be performed.

[0039]

[Effects of the Invention] In the continuous screw tightening machine of the present invention, if the position of the abutting member relative to the movable member is changed, the moving stroke of the movable member changes accordingly, and the distance between the movable member and the abutting member is shortened. I see, because the movement stroke becomes shorter,
Regardless of the length of the applied screw, the screwing depth can always be kept constant. Therefore, there is no need to adjust the movement stroke of the moving member according to the length of the applied screw, which has the advantage of improved operability. In addition, by adopting a structure in which the abutting position is adjusted using a screw body on the case side, the screwing depth can be adjusted accurately on the case side, further improving operability, and providing continuous threading in the screwing direction. This has the advantage that the overall length of the tightening machine can be shortened.

[Brief explanation of the drawing]

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. 1;

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

FIG. 4 is a right side view showing the case shown in FIG. 1 together with a moving member, with a portion thereof being partially cut away.

FIG. 5 is a right side view similar to FIG. 4, showing a state in which the movable member is retracted to the highest position relative to the case.

FIG. 6 is a front view of 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 in FIG. 7;

[Explanation 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 nails 92 Ratchet wheel 110 Adjustment nut 116 Stopper plate 122 Contact member 140 Stopper part 142 Eccentric plate 146 Adjustment knob 154 This board B Screw connection band S screw

Claims (2)

[Claims] 1. A main body containing a drive motor, a driver bit drive shaft that projects from the main body and is rotationally driven by the drive motor, and a driver bit drive shaft that is attached to the main body and extends longitudinally in the axial direction of the driver bit drive shaft. a case having a case, a movable member mounted in the case so as to be slidable in the longitudinal direction of the case, and a movable member mounted so as to be adjustable in position with respect to the movable member according to the length of the screw to be applied, and having an end portion. a contact member pressed against a tightened object into which a screw is to be screwed; a spring biasing the movable member in a direction in which the abutment member protrudes from the distal end of the case; a screw supply device that sequentially feeds each screw of the screw connection band to a screw tightening position by a driver bit attached to the driver bit drive shaft in relation to the movement of the moving member, the continuous screw tightening machine comprising: The case and the contact member are each provided with a locking portion that restricts the limit of movement of the corresponding contact member in a direction opposite to the protrusion direction by mutual contact, thereby regulating the screwing depth. 1. A continuous screw tightening machine, wherein at least one of the locking parts has a variable contact height with respect to the other locking part. 2. The locking portion whose contact height is variable is a screw body provided on the case side and having a contact portion with the locking portion of the abutment member, the screw 2. The continuous screw tightening machine according to claim 1, wherein the contact position is variable by adjusting the position of the body.