JPH0158029B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a continuous screw tightening machine that is capable of continuously screwing steel screws from above wood for screwing wood onto a metal plate. This invention relates to a mechanism that corrects the inclination at the initial stage of screwing so that the screw fed into the tightening machine is not screwed in while being inclined with respect to the screw bit axis.

[Conventional technology]

Steel is often used as the main construction material not only for 30- and 50-story high-rise buildings, but also for other high-rise buildings. Since the iron material is also used for partitions, window frames, etc. in each room of the building, it is used as a support material to allow curtains, other decorations, and furniture to be easily installed and removed in each room. Wood is mainly attached to the iron material, and wood screws and nails can be easily driven into the wood as necessary.

By the way, when attaching wood to steel,
Previously, the steel material had female threads in advance, and the bolts were screwed through the holes drilled in the wood to secure them in place. It is very time-consuming because it has to be formed and holes that match the internal threads have to be drilled in the wood, making the wood installation work extremely complicated in buildings with many private rooms, such as high-rise buildings.

Therefore, a strong wooden screw-like steel screw was developed as a set screw, and the screw can be driven several meters/millimeter by simply placing a screwdriver in the groove of its head and pushing the screwdriver around.
This screw has the property of threading through iron plates of a certain thickness while cutting, and by simply screwing the screws over the wood placed on the iron plate, wood B can be fixed on iron plate A as shown in Figure 6. It became like that.
The machines that can perform the screw screwing work continuously are JP-A-50-74899, JP-A-53-37968, JP-A-57-
It was already known by 33973.

However, with these conventional continuous screw tightening machines, even though the screws fed into the tightening machine are tilted with respect to the bit axis, they can still be applied to the workpiece (wood).
In order to screw into the steel, a very large rotational force is required on the bit, which often not only inhibits the rotation of the bit but also makes it difficult to screw into steel, and it has many disadvantages such as reducing the bonding strength of wood to steel. It was hot.

[Problems to be Solved by the Invention] An object of the present invention is to provide a continuous screw tightening machine as described above so that the screws fed into the tightening machine are not screwed in while being inclined with respect to the axis of the screw bit. It is to make it.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a screw rotation bit protruding from the front end of the motor part in the motor housing so as to rotate when driven by the motor part. A screw connecting band, which is made up of a number of steel screws attached at regular intervals with thread, is installed in a predetermined position, and is biased so as to always protrude a certain length in front of the bit, and is arranged so as to be movable back and forth. The machine is equipped with a screw-connected band feeding mechanism that moves the screw-connected band one pitch at a time in conjunction with the back and forth movement of the block, and moves the electric motor section to the workpiece while the front end of the block is in contact with the workpiece. When you push it closer to
The backward movement of the block gives an initial motion to the screw-connected band feeding mechanism, and the bit engages with the head of the first screw in the screw-connected band, screwing the screw into the workpiece and starting the motor section. In a continuous screw tightening machine, in which the block is returned by force when separated from the workpiece, and the screw connecting band is fed one pitch by a feeding mechanism,
At approximately the center of the front end of the block, a holding plate is provided with a rear edge facing the screw connecting band on the block,
There is a forward position where the leading edge slightly protrudes from the front end of the block and the rear edge is separated from the screw connecting band, and a forward position in which the leading edge slightly protrudes from the front end of the block and the rear edge is in contact with the screw connecting band and pushes the screw connecting band backward, thereby removing the screw on the block. A spring is provided between the presser plate and the block to constantly bias the presser plate toward the forward position.

[Function and Effect] The screw on the block shows a tendency to tilt with respect to the bit axis because the connecting band is pulled outward from the block, but before screwing the screw into the workpiece, the front end of the block When pressed against the workpiece, the presser plate protruding from the front end of the block is first pushed into the block, and the rear edge of the presser plate contacts the screw connecting band and pushes the screw connecting band backward. The tilting tendency of the screw is regulated.

Therefore, in the present invention, since the inclination tendency of the screw can be automatically regulated during the screwing operation, there is an advantage that the screwing operation can be performed smoothly and easily.

[Embodiment] Next, the present invention will be explained in detail with reference to an embodiment shown in the attached drawings.As seen in Figs. A motor part 1 having a handle part 10 connected to the rear part to make it easier to tighten the screw, a screw tightening mechanism part 2 that protrudes from the front end of the motor part 1 by a certain length and performs a screw tightening function, and The mechanism 2 is made up of a screw feeding mechanism part 3 which is formed to protrude forward from the electric motor part 1 at the front end of the mechanism 2 and retracts above the electric motor part when screws are tightened, and a screw connecting band storage container 4.

The screw connecting band storage container 4 is shown in chain lines in FIG. 2 and as a side view in FIG. 3, but its general form is a shallow cylinder that can accommodate the height of the screw S. The screw connecting band 41 can be pulled out from an opening 40 provided in a part, and the screw S at the pulled out end is incorporated into the screw feeding mechanism 3 and used for tightening the screw.

The container 4 has a screw connection band 4 along the peripheral wall of the container.
1 is housed in a spirally wound manner, and about 150 screws S are attached to the connecting band 41 at equal intervals. Therefore, when a series of screw connecting bands 41 have been used, turn the stopper 42 of the container to release the engagement between the container body and the lid 43, open the lid 43, and place a new screw connecting band 41 into the container 4. , you can continue to tighten the screws. However, this screw tightening machine is very often used when attaching wood B to steel frame A on the ceiling of a room, so it is difficult to tighten containers 4 during screw tightening work at high places. Since it is dangerous and difficult to assemble a new screw connecting band to the screw connecting band 41, it is necessary to make it possible to easily attach the container 4 itself containing the screw connecting band 41 to a screw tightening machine. Thus, the holder 44 for the container 4 is provided on the side wall of the motor section 1.

On the other hand, the bottom of the container 4 is also provided with a thin plate 45 that projects outwardly from the bottom, and a window hole 46 is formed at the tip of the thin plate 45. The holder 44
is formed to protrude from the side wall of the motor to such an extent as to hold the thin plate 45, and the thin plate 4 is disposed within the holder 44.
The locking plates 47 are attached to the locking shafts 48 of the holder 44 at intervals that allow the locking plates 47 to be inserted through the locking plates 47. A spring wire 49 is wound around the stop shaft 48, and one end of the spring wire 49 acts on the side wall of the electric motor, and the other end acts on the locking plate 4.
7, thereby urging the locking plate 47 to constantly rotate counterclockwise in FIG. 3 with the locking shaft 48 as a fulcrum.

The locking plate 47 has a locking piece 47' projecting obliquely downward toward the holder 44 on its midsection, and a guide piece 47'' projecting upwardly of the motor section 1 on its upper side. Note that the lower half of the locking plate 47 protrudes slightly downward from the lower side of the holder 44, so that when you place your fingertip on the lower part of the locking plate 47, the locking plate 47
When a clockwise rotation is applied against the spring force 49,
The locking piece 47' moves away from the holder 44, and at this time the locking piece 47' comes out of the window hole 46 of the container thin plate 45, so that the container 4 can be pulled upward from the holder 44.

When you release the rotational force of your fingertips on the locking plate 47,
The locking plate 47 is rotated counterclockwise by a spring 49,
The locking piece 47' is placed against the holder 44. Therefore, when the thin plate 45 is inserted into the holder 44 in order to attach the container 4 to the holder 44 in that state, the thin plate 45 is guided by the guide piece 47'' and is inserted into the narrow gap between the locking plate 47 and the holder 44. The locking piece 47' is pushed open against the spring force 49 and attempts to penetrate downward into the holder 44, and at this time, the locking piece 47' enters the window hole 46 of the thin plate 45.
In this way, the thin plate 45 is firmly locked to the holder 44 by the locking piece 47', and the thin plate 45 cannot be pulled out from the holder 44 unless the locking plate 47 is rotated by placing a fingertip on the lower side thereof. become unable to do so.

A mechanism part 3 that holds the screw connecting band 41 pulled out from the container 4 and sends the screw connecting band 41 to the position of the bit 20 for tightening the screws S one by one to the wood B protrudes forward from the front end of the electric motor part 1. However, in order to tighten the screw S, if the front end of the tightening machine, that is, the front end of the screw feeding mechanism section 3, is applied to the wood B as shown in the chain diagram in Figure 6, and the whole tightening machine is operated to press against the wood B. , the screw feeding mechanism section 3 is
It is drawn into the upper side of the motor part 1 together with the pipe 30 that supports the motor part 1. However, when the pressing operation is released and the front end of the feeding mechanism section 3 is pulled away from the wood B, the feeding mechanism section 3 and the support pipe 30 protrude toward the front of the electric motor again. A stop roller 11 for regulating the protruding position is provided at the front end of the motor section 1.

The pipes 30 that support the screw feeding mechanism 3 to the electric motor 1 are located on both the left and right sides of the screw tightening bit 20.
A block 31 incorporating the necessary screw feeding function of the screw feeding mechanism section 3 is attached to its front end. The rear half of the support pipe 30 is inserted into and supported by the support pipe sliding pipe 12 (see FIG. 1) provided above the motor section 1, and the support pipe sliding pipe 12 is
It is assembled in a housing 100 formed above the rear half of the motor section 1 so as to protrude above the motor section 1 .

The housing 100 has a hole 13 for allowing the support pipe 30 to penetrate deeply into the housing 100.
There is a resilient spring receiving plate 14 at the inner end of the hole 13. A resilient spring 15 is installed between the receiving plate 14 and the support pipe 30, and the spring 15 urges the support pipe 30 to always protrude forward of the motor section 1.

The block 31 of the screw feeding mechanism 3 has a hole 32 in the rear half of its center that is large enough to allow the screw tightening bit 20 and the front end of the bit support sleeve 21 to be inserted. A through hole is formed at approximately the center of the block 31 through which only the bit 20 can pass, and a screw S is installed on the front surface of the through hole.
The countersunk head is positioned so that the Note that the tip of the bit 20 is always located directly in front of the through hole, which is hot as shown in FIGS.

The mechanism for feeding the screw S into a predetermined position on the block 31 is based on a link mechanism and a feed claw attached to the back side of the block 31. The link mechanism is the fifth,
As shown in Figure 6, it is made up of a screw feed lever 33 with a special shape, a link lever 34, and a link 35 that connects both levers 33 and 34.

The screw feed lever 33 has a rear end 33' (fifth,
6) is rotatably attached to the block 31 at a position close to the rear side of the block 31, and the front end of the lever 33 extends to about the middle of the screw S located in front of the bit 20.
The inner side of the lever 33 has a two-stage curved cam 3.
3'', and the stop roller 11 slides on the cam 33''. Therefore, when the screw feed lever 33 is in the normal non-operating state, the stop roller 11 is in the block 3 as shown in FIG.
1, and its stop roller 11
Due to the action of the link lever 34 and the connecting link 35, the front end is pulled in the direction of the central screw S. However, when the motor section 1 is pressed against the wood B as shown in FIG. 6 in order to tighten the central screw S to the wood B, the stop roller 11 moves forward together with the motor section 1. At this time, the cam 33'' is pushed by the roller 11, and the screw feed lever 33 rotates its front end in the direction of the next screw connected by the screw connecting band 41.Using this action, the cam 33'' is pushed. A screw feed claw 50 is provided at the front end of the screw feed lever 33.

As seen in FIGS. 4 and 5 and FIGS. 2 and 3, the screw feed pawl 50 puts its lower part into a notch 51 formed at the front end of the screw feed lever 33, and attaches to the base plate 52 provided upright in the notch 51. One end of a spring 54 wound around the shaft 53 is locked to the feed lever 33, and the other end is locked to the feed pawl 50, so that the spring 54 always keeps the tip of the spring 54 around the shaft 53 as a fulcrum when the clock is rotated as shown in FIG. It is biased to rotate in the direction. However, the lower part of the feed pawl 50 is in abutment with the notch 51, and even though the spring 54 is trying to rotate the feed pawl 50 clockwise, the feed pawl 50 remains upright on the feed lever 33. , it won't turn any further. On the other hand, if an attempt is made to turn the feed pawl 50 counterclockwise, it will easily rotate against the spring force 54.

The screw connecting band 41 is on the front side of the block 31,
The screw feed lever 33 is located on the back side of the block 31. Therefore, in order to cause the tip of the feed pawl 50 to act on the screw S, a window hole 39 of a specific size is drilled in the block 31, and the tip of the feed pawl 50 passes through the window hole 39, and the tip of the feed pawl 50 touches the screw S. It is designed to work on.

The screw feed pawl 50 has the above structure, and when the front end of the screw feed lever 33 swings from the position shown in FIG. 5 to the position shown in FIG. 6, the feed pawl 50 also swings within the window hole 39. . The screw connecting band 41, which is fed while sliding on the window frame forming the window hole 39, that is, on the block 31, has screws S attached at regular intervals, so that when the tip of the feed pawl 50 swings inside the window hole 39, , corresponds to the next screw. However, in this case, the tip of the feed pawl 50 resists the spring force 54 and easily rotates counterclockwise about the stop shaft 53 as a fulcrum, allowing it to pass under the screw it hits. Therefore, when the screw passes through in this manner, the feed claw 50 immediately returns to the upright state by the spring 54, and when the feed lever 33 returns to the position shown in FIG. 5, it hits the midsection of the screw that has just passed through, The screw is sent to the center of block 31. In this way, the screw connecting band 41 is fed one pitch each time one of the screws S attached thereto is tightened to the wood B, and the screws S on the connecting band 41 are sequentially sent to predetermined positions on the block 31.

A link lever 34 is attached to the back side of the block 31 for accurately and reliably performing the swinging motion of the screw feed lever 33.
4 and the screw feed lever 33 are connected by a connecting link 35. The link lever 34 has a finger piece 34' that corresponds to the back of the stop roller 11.
When the block 31 and its support pipe 30 protrude from the housing 100, the fingers 34'
is in abutment with the stop roller 11 to prevent the block 31 from coming out of the housing 100 any further. Furthermore, the fact that the fingers 34' have a tendency to rotate when they come into contact with the stop roller 11 means that the feed pawl 50 moves the screw S into a predetermined position on the block 31 due to the connection of the levers and links. It is firmly in position and sent out.

The screw connecting band 41 incorporated on the surface side of the block 31 moves here and there from a predetermined position on the block 31, making it impossible to feed the screw accurately. Also, the screw S has an enlarged countersunk head. For these conditions, as shown in FIGS. 4 and 7, a groove 38 for passing the screw countersunk head is formed in the block 31 at a position behind the window hole 39, and a groove 38 is formed on the block 31 to pass the screw countersunk head placed on the block 31. A lid 60 for pressing the connecting band 41 is provided.

This presser cover 60 is attached to the window hole 39 of the block 31.
It has a size that covers most of the block 31, and can be rotated onto the block 31 using a support shaft 37 attached to the block 31 as a fulcrum as shown in the solid line diagram in FIG. 4 and the chain diagram in FIG. With the lid 60 rotated in this manner, the screw connecting band 41 can be easily installed in a predetermined position of the block 31 or removed from the installed position.

After assembling the screw connecting band 41 to the block 31,
When the presser lid 60 is placed over the screw connecting band 41,
The hinge portion 61 of the presser lid 60 is pushed inward of the block 31 by an elastic spring 62 incorporated in the support shaft 37, and slides a little on the jetty 36 of the block 31.
That is, the jetty 36 is such that the screw connecting band 41 is not pressed any further by the pressing lid 60 being placed thereon.

When the presser cover 60 slides on the jetty 36 as described above, the protrusion 63 formed on the presser cover 60 (see the dotted line diagram in Figure 1) enters the cutout groove 64 of the block 31, and the cover 60 is turned into a closed state. It is locked onto block 31. Therefore, in order to open the holding lid 60, the lid 60 must be pulled back a little on the support shaft 37 to open the notch groove 64.
The protruding piece 63 that has protruded into the groove 64 must be pulled out from the groove 64. In order to facilitate the operation, a knob 65 is provided protruding from the presser lid 60. Note that there is a protrusion 60' on the back side of the presser lid 60.
When the holding lid 60 is placed over the screw connecting band 41 by the protruding ridges 60', the countersunk of the screw S is sandwiched between the block projection 36 and the screw connecting band 41 plays on the block 31. I'm holding it down so it doesn't touch it.

A screw holding pawl 66 is attached to the side of the block 31 with a stop shaft 67 to prevent the screw connecting band 41 assembled in the block 31 from moving unnecessarily in a predetermined position. (See Fig. 4) The pawl 66 is designed to hold the belly surface of the screw on the same side as the screw feed pawl 50 at a position before and after the screw feed pawl 50, and protrudes from the side of the block 31 over the screw S. A small projection protrudes from the lower surface of the square rod 68. However, with this holding claw 66, the screw connecting band 6
1 cannot be assembled into the block 31, a spring 70 is installed between it and a catch 69 attached to the block 31 so as to straddle the square bar 68, and the elastic force of the spring 70 is applied to the square bar 68. This is effective in holding down the screw S, and the square bar 68 rotates slightly upward about the stop shaft 67 against the spring force 70, so that the holding claw 66 opens the screw holding position. In this way, the screw S can be installed at a predetermined position.

The screw holding claw 66 always holds the screw S as described above, but when the bit 20 is pushed out in order to tighten the screw S to the wood B, the bit 20 pushes up the screw holding claw 66 against its spring force 70. This prevents the bit 20 from becoming an obstacle when passing under the holding claw 66. Also, the feed claw 50
When sending out the next screw, the delivered screw S pushes up the holding claw 66 with its abdomen, allowing the screw S to be seated at a predetermined position. For this reason, the end surface of the screw feeding side of the holding claw 66 is formed into an inclined surface that is easily pushed up by the abdomen of the screw.

In order to tighten the screw S to the wood B, hold the handle 10 of the tightener and place the tip of the tightener against the wood B as shown in Fig. 5. When you press the tightener toward the wood B, the block 31 A movable pressing plate 71 protruding from the center of the front face moves in and out of a cut groove 72 on the front face of the block. This pressing plate 71 is
Although it is thin, the cover plate 73 and the holding claw 66 attached to the back side of the block 31 as shown in FIG.
A stopper 69 is provided on the back side of the block 31 to prevent it from falling out of the cut groove 72, but to keep it in the forward position where its front edge always protrudes a small length from the front edge of the block 31. An elastic spring 74 is installed between the wrapped portion and the block 31, and the spring 74 is biased to protrude. However, in order to restrict the length of the protrusion, the stop end 7 is attached to a cover plate 73 attached to the back side of the block 31.
3' is provided in a protruding manner, and the stepped portion 71' of the presser plate 71 abuts against the stop end 73'.

When the tightening machine presses against the wood B, the presser plate 71 is retracted into the block 31 and assumes a retreated position so that the front edge of the presser plate 71 is flush with the front edge of the block 31 as shown in FIG. At this time, the holding plate 71
The rear edge 75 on the block 31 hits the synthetic resin band 41 of the screw connection band 41 running through the back of the block 31, and pushes the band 41 slightly upwards toward the rear of the block 31.

By the way, when the screw connecting band 41 is pulled out from the container 4 and assembled into the block 31, the screw connecting band 41 tends to be pulled diagonally backward of the block 31 due to the positional relationship between the container 4 and the block 31 as shown in FIG. Yes, this tendency makes the screw S its block 3.
At a predetermined position on 1, the block is slightly inclined with respect to the center line of the block. Therefore, if the screw S is screwed into the wood B with the bit 20 in this state, the screw S will naturally be screwed into the wood B in an inclined state and will pierce the iron plate A. This not only requires a very large driving force to screw in, but also reduces the bonding force of the wood B to the iron plate A, and the shape of the screw head that appears on the wood B is also unsightly.

However, pushing up the screw connection band 41 by the rear edge 75 of the holding plate 71 as described above eliminates the slope of the screw S on the block 31, and the screw S is placed perpendicular to the wood B or at the angle at which the tightening machine is applied. can be tightened.

When the tightening machine is pulled away from the wood B, the presser plate 71 immediately protrudes a predetermined length by the spring 74, and the rear edge 75 separates from the screw connecting band 41, releasing the pushing force on the screw connecting band 41. The connecting band 41 is allowed to be sent out in a predetermined direction on the block 31.

When the tightening machine is pushed toward the wood B to tighten the screws, the block 31 comes to move over the motor part 1 together with its support pipe 30, and the bit 2 protruding from the housing 100 by a certain length
0 hits the countersunk head of screw S on block 31. When the tightening machine is further pressed, the block 31 is further retracted onto the motor part 1, and the bit 20 breaks the connection of the screw S with the connecting band 41, pushes out the top of the block 31, and pierces the wood B. At this point, a rearward thrust is also generated on the bit 20, and rotational force is applied to the bit 20 for the first time. The mechanism is as follows.

As seen in FIG. 8, the bit 20 is rotatably supported on a bearing 80 incorporated in the housing 100 by a bit rotating shaft 22 incorporating the bit, and furthermore, the rotating shaft 22 can slide somewhat backwards. It's becoming like that. However, the bit rotation shaft 22 is fixed by a spring 24 (dotted line diagram in FIG. 8) installed between the bit rotation shaft 22 and the transmission shaft 81 at the rear thereof.
The female clutch 25 formed at the rear end is pushed forward until it abuts against the bearing 80, and normally the female clutch 25 is separated from the corresponding male clutch 82 at the front end of the transmission shaft 81. Therefore, when a backward thrust is generated on the bit 20 as described above,
The bit rotation shaft 22 slides rearward against the spring 24, whereupon the female clutch 25 engages with the male clutch 82 at the front end of the transmission shaft 81, and the bit rotation shaft 22 rotates. That is, the bit 20 rotates and screws S into wood B.
Screw into.

As shown in FIG. 2, the transmission shaft 81 rotates an electric motor (not shown) by operating a switch button 10' provided on the handle 10, and the rotation of the electric motor shaft 83 is controlled by a transmission gear group provided at the rear of the housing 100. It rotates at low speed after undergoing speed conversion of 84.
Even if the switch button 10' is turned on and the electric motor, ie, the transmission shaft 81, is rotating, the bit 20 will not rotate unless the female clutch 25 of the bit rotating shaft 22 engages with the male clutch 82.

The bit 20 engages with the groove in the countersunk head of a hard steel screw S, and the screw S is inserted into the wood B as well as the wood B as shown in Fig. 6.
It must also be screwed into iron plate A. Therefore, the tip is made of a hard material, but if a large number of screws S are tightened, the tip will become rounded. Therefore, the bit 20 is connected to the bit rotation shaft 22.
In order to easily remove the bit from the housing 1 and replace it with a new one, attach the tip of the bit rotating shaft 22 to the housing 1.
A square hole 23 protruding from the front surface of the bit 20 is formed in the protruding part through which the square shaft 20' of the bit 20 can be inserted.
The rear end of the square shaft 20' (represented as a bit at the rear end) is inserted into it, and a steel ball 27 (dotted line diagram in Figure 8) falling into the groove 26 formed in the rear part of the bit square shaft 20' is inserted into the bit. The bit square shaft 20' is inserted into the small hole 28 made in the rotating shaft 22, and the bit square shaft 20' is inserted into the groove 26 and the small hole 2.
The steel ball 27 attached to the bit rotation shaft 22 is placed over the bit rotation shaft 22 to prevent the steel ball 27 from jumping out from the small hole 28, but the sleeve 21 When the sleeve 21 is retreated and the groove 29 formed on the inner surface of the front end is aligned with the small hole 28,
Since a part of the steel ball 27 can enter the groove 29, the bit angle shaft 20' can be inserted into the bit rotating shaft 22.
When the square shaft 20' is pulled out, the concave groove 26 of the square shaft 20' pushes up the steel ball 27 above the small hole 28 with its slope, and the square shaft 20' and the bit rotation shaft 22 are disengaged, and the square shaft 20' is pulled out. 20' can be pulled out from the square hole 23.

In order to always keep the concave groove 29 of the sleeve 21 in alignment with the small hole 28 and to prevent the bit 20 from unnecessarily slipping out from the bit rotating shaft 22, the sleeve 21 has its curved rear end 21' connected to the hanging 100. The curved rear end 21'
A spring 85 provided within the housing 100 is applied to urge the sleeve 21 forward at all times. Therefore, in order to pull out the bit 20 from the bit rotating shaft 22, the sleeve 21 may be slightly pushed into the housing 100 against the spring force 85, so that the groove 29 is aligned with the small hole 28.

When tightening the screw S into the wood B, it may be necessary to adjust the shallowness and depth of the tightening. In order to be able to make minute adjustments, as shown in FIG.
A grip ring 86 for moving the position of the receiving plate 14 back and forth where it collides with the receiving plate 14 provided at the rear end of the hole 13 and stops retracting has a part of its circumferential surface attached to the housing. The grip ring 86 is provided so as to be exposed on the surface of the grip ring 86, and the grip ring 86 has a knurled notch on its circumferential surface to facilitate rotation operation with a fingertip. , the receiving plate 14 combined with the female thread provided on the grip ring 86 is attached to the square shaft 87.
Slide on it and change its position. When the receiving plate 14 is located in front of the square shaft 87, the retracted position of the pipe 30 is somewhat shallow. Therefore, the retracted position of the block 31 becomes a little shallower, so the bit 20 is located at the rear of the block 31 by that amount, and the tightening of the screw S becomes a little shallower.

There are cases where it is desired to use the bit 20 alone to tighten other screws. Therefore, in order to meet this demand, a mechanism for removing the stop roller 11 is provided. When the stop roller 11 is removed from the mounting position at the front end of the electric motor section 1, there is no longer any engagement with the finger piece 34' of the link lever 34 that was locked to the roller 11 and prevented the block 31 from jumping out. The block 31 and the support pipe 30 will suddenly fly out due to the elasticity of the elastic spring 15, which is dangerous. Therefore, in order to prevent the stop roller 11 from being easily removed, the lower half cover 16 at the front end of the motor unit 1 is provided with screws 17 as shown in FIG. A stop roller support stand 19 is screwed to the front end of the motor section 1 with screws 18 (dotted line diagram in FIG. 8). Therefore, the stop roller support base 19 has its set screw 1
Even if screw 8 loosens a little inside the motor section 1, it will not come off from the front end of the motor section 1, but remove the screw 17 and
If the lower half cover 16 is removed as shown in FIG.
Since the set screw 18 can be removed, the support stand 19 can be removed from the front end of the motor section 1 together with the stop roller 11 attached thereto.

The screw connecting band 41 is mainly made of synthetic resin and has a wide band 41. On the back side of the band 41, a large number of steel screws S are arranged at specific equal intervals, and on the back side of the band 41, a thin synthetic resin screw 41 is attached. ′ (Figure 7 chain line diagram)
is attached to the band 41 by gluing it to the back side of the band 41. Therefore, when the bit 20 pushes out one of the screws S on the block 31, only the part of the thread 41' that stops the screw S being pushed out is removed. broken,
This allows the screw S to slide easily on the block 31. The broken thread 41' remains attached to the band 41,
It passes between the rear edge 75 of the holding plate 71 on the block 31 and the square bar 68 of the holding claw 66, and is sequentially sent out to the opposite side of the block 31.

In addition, in the screw feeding mechanism part of the block 31,
As shown in the chain line diagram 99 in FIG. 2, the stop roller 1
The cover is applied in such a way that it does not become an obstacle to 1.

As described above, in the continuous screw tightening machine of the present invention, the screw feeding mechanism section 3 is supported above the electric motor section 1, and the mechanism section 3 is retracted into the upper side of the electric motor section. Since the length is shortened and the transmission mechanism 84 from the electric motor is installed close to the handle 10, the disadvantage of conventional tightening machines such as the front part of the tightening machine being abnormally heavy is eliminated, making screw tightening work easier. Not only is it easier to remove, but screws S can now be screwed into wood B perpendicularly to wood B, so wood B can be securely attached to iron plate A, reducing operating effort. This made it possible to use it as a screw tightening machine.

[Brief explanation of drawings]

The attached drawings show an embodiment of the continuous screw tightening machine of the present invention, in which Fig. 1 is a plan view of the whole with the screw connecting band storage container removed and a partially cut section shown, and Fig. 2 is a side view of the same. , Fig. 3 is a front view of the whole with the screw connecting band storage container attached, Fig. 4 is a perspective view of the screw feeding mechanism portion, and Fig. 5 is a plan view of the screw feeding mechanism when it is not in operation.
Figure 6 is a plan view of the same operation, Figure 7 is a side view showing the same part in cross section, and Figure 8 is a cross section showing part of the screw tightening mechanism, showing the lower half of the front end of the electric motor part. FIG. 9 is a side view of the embodiment with the cover removed, and a plan view of the embodiment in which the screw connecting band is assembled into the block. 1 is an electric motor part, 2 is a screw tightening mechanism part, 3 is a screw feeding mechanism part, 4 is a container for storing the screw connecting band 41,
10 is a handle, 11 is a stop roller, 13 is a hole in the housing 100, 14 is a receiving plate, 15 is an elastic spring, 16 is a lower half cover of the front end of the electric motor section, 19
is the stop roller support stand, 20 is the bit, 20'
is a bit square shaft, 21 is a sleeve, 22 is a bit rotating shaft, 23 is a square hole, 24 is a spring, 25 is a female clutch, 26 is a groove, 27 is a steel ball, 28 is a small hole, 29
30 is a concave groove, 30 is a support pipe for block 31, and 32 is a concave groove.
is the hole, 33 is the screw feed lever, 33' is the rear end,
33'' is a cam, 34 is a link lever, 34' is a finger piece thereof, 35 is a connecting link, 36 is a jetty, 37 is a support shaft of the presser cover 60, 38 is a groove for inserting the countersunk head of screw S, and 39 is a window hole. , 40 is an opening of the container 4, 42 is a stopper for the lid 43, 44 is a holder, 45 is a thin plate, 46 is a window hole, 47 is a locking plate, 47' is a locking piece, 49 is a spring, 50 is a screw feeder Claw, 51 notch, 52 support plate, 53 stop shaft, 54 spring, 60' ridge,
61 is a hinge, 62 is a spring, 63 is a projecting piece, 64 is a notched groove, 65 is a knob, 66 is a screw holding pawl, 68 is a square shaft, 69 is a clasp, 70 is a spring, 71 is a holding plate, 72 is a cutout 73 is a cover plate, 73' is a stop end thereof, 74 is a spring, 81 is a transmission shaft, 82 is a male clutch, 83 is a motor shaft, 84 is a transmission gear group, 85
is a spring, 86 is a grip ring, 87 is a square shaft, A is an iron plate, B
is wood.

Claims (1)

[Scope of Claims] 1. A screw rotation bit protruding from the front end of the motor part in the motor housing so as to rotate when driven by the motor part, and a large number of steel screws arranged at regular intervals with threads. The attached screw connecting band is incorporated in a predetermined position, and the block is disposed so as to be able to move back and forth while being biased so as to always project a certain length in front of the bit, and the block is interlocked with the back and forth movement of the block. It is equipped with a screw connecting band feeding mechanism that transfers the screw connecting band one pitch at a time, and when the electric motor section is pushed close to the workpiece with the front end of the block in contact with the workpiece, the block is moved backward. As a result, the initial operation is given to the screw-connected band feeding mechanism, and
When the bit engages with the head of the first screw in the screw connecting band and the screw is screwed into the workpiece, and the motor part is separated from the workpiece, the block is returned by force and the screw connecting band is fed. In a continuous screw tightening machine which is adapted to feed screws one pitch by a mechanism, a presser plate is provided approximately at the center of the front end of the block with a trailing edge facing the screw connecting zone on the block, and the front edge is located at the front end of the block. The forward position is such that the screw slightly protrudes from the block and the rear edge is separated from the screw connecting band, and the rear edge contacts the screw connecting band and pushes the screw connecting band backward, thereby regulating the inclination of the screw on the block. 1. A screw position regulating device for a continuous screw tightening machine, characterized in that the screw position regulating device is mounted so as to be movable forward and backward in a backward position, and a spring is provided between the holding plate and the block to always bias the holding plate toward the forward position.