JPS62203778A - Continuous screw clamping machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous screw tightening machine for screwing wooden boards and other plate materials to metal materials.

[Prior Art] The present inventors previously developed a screw tightening machine described in Japanese Patent Application Laid-Open No. 57-33973, Japanese Patent Application Laid-Open No. 59-124579, and the like. These screw tightening machines are mainly used to screw wood onto metal plates, and use a screw connecting band in which many screws are attached to a synthetic resin strip. The screws are sequentially transferred to the operating position of a bit for tightening, and the screws are screwed and fixed onto the object using the bit.

Therefore, with this type of screw tightening machine, care must be taken to ensure that the screw to be screwed is not tilted on the axis of the tightening bit. If tightening is done by force, the fixation will be incomplete and the desired strength will not be obtained.

In order to prevent such screws from tilting, for example, in the screw tightening machine disclosed in Japanese Patent Application Laid-Open No. 57-33973, the screw tightening is performed using a guide plate that connects the screws to the block through which the screws are inserted. At the tip of a sliding plate that is movably provided on this block to hold the band, there is an objective protection plate that touches the object near the screwed-in position. The tip of the screw in the next position, that is, the next screw to be tightened, is brought into contact with the back of the objective protection plate according to the tightening operation, so that the screw is firmly pressed against the guide plate.

In this way, if the screw is tightened so that the screw in the next position is fixedly held according to the movement, the posture of the screw that is currently being screwed in can be maintained appropriately. However, when completing the tightening of a screw and transferring the next screw to the working position of the screw / ),
In order to enable its transfer, it is necessary to release the holding of the screw by the objective holding plate, which complicates the structure accordingly.

Furthermore, in the screw tightening machine disclosed in Japanese Patent Application Laid-open No. 5F3-124579 mentioned above, a holding claw is provided to prevent the screw to be screwed in from moving unnecessarily at the operating position of the tightening bit. A holding plate is provided to optimize the posture of the screw when tightening the screw. The holding claw is pressed against the screw at the screwing position by a spring from behind, and resists the force of the spring when the bit screws in the screw or when the next screw is transferred to the bit's working position. and retreat. In addition, the above pressing plate is
When tightening a screw, the synthetic resin strip that connects the screws is pressed against the object at its trailing edge to optimize the posture of the screw, and after the screw is tightened, it returns to its original state. This will restore the condition.

In this way, in the conventional screw tightening machine. In order to hold the screw in an appropriate position when tightening the screw, a movable holding means is used that performs a holding operation in accordance with the tightening operation of the screw.

However, adopting such a movable holding means has problems such as significantly complicating the structure of the screw tightening machine itself and requiring adjustment of the equipment to perform smooth screw tightening. ing. In particular, these holding means sometimes temporarily hold the screw connecting band in a proper posture when tightening a screw, and later hold the connecting band in order to move the next screw to the tightening position. Therefore, it is necessary to operate the holding means for the connecting band in synchronization with the tightening operation of the screw, which further complicates the mechanism and requires delicate adjustment.

[Problems to be Solved by the Invention] In order to solve the above-mentioned problems, the inventor of the present invention has repeatedly carried out various experimental trials, and as a result, it has been found that the connecting band of screws made of synthetic resin has an appropriate hardness. If so, there is no need to use a movable holding means to hold the screw connecting band, but simply a fixed guide plate that holds the next screw to be tightened and several subsequent screws, and a band-like piece that remains behind to tighten the screws. It was confirmed that the screw could be held in an appropriate position simply by providing a fixed guide piece for insertion.

The present invention is based on this knowledge, and eliminates the need for a movable holding means that synchronizes with the tightening of the screws to hold the screw connecting band, simplifies the structure of the entire device, and eliminates the need for delicate adjustments. The purpose is to obtain a continuous screw tightening machine that eliminates the need for screws.

Another object of the present invention is to use the same fixing means to connect a tip block that is replaced depending on the length of the screw and an engagement member that holds the band member that remains behind when tightening the screw. To provide a continuous screw tightening machine which can be attached to a sliding block, thereby making it possible to respond to changes in the length of screws in a very simple and easy manner.

[Means for Solving the Problems] In order to achieve the above object, the continuous screw tightening machine of the present invention includes a screw tightening mechanism section that performs a screw tightening action by rotating a screw tightening bit, and a large number of screw tightening mechanisms. A screw feeding mechanism that sequentially sends out each screw of a screw connecting band in which the screws are attached to a synthetic resin band member in parallel to a tightening position by the bit in conjunction with the tightening operation in the screw tightening mechanism section. In a known continuous screw tightening machine equipped with the above-mentioned screw feeding mechanism,
A guide path for the screw connecting band is provided to hold and guide the head of the screw connected to the screw connecting band so that the head of the screw does not slip out in the engagement step part, and a tightening action by a bit is provided on the extension of the guide path. At a position beyond the screw tightening position, an engaging member is fixedly provided to prevent the synthetic resin band member left by the screw tightening from moving in the direction of the screw tightening, and the band member of the screw connecting band is By holding the screw head in the guide path of the screw connecting band and holding the band member by the above-mentioned engagement member, the tightening should have enough strength to prevent the screw in the operating position from tilting during the tightening operation. ,
Thus, the present invention is characterized in that a movable holding means for holding the screw in accordance with the tightening operation of the screw is eliminated.

[Function] The leading screw of the screw connecting band inserted into the guide path is placed in the tightening position by the bit, and the band-shaped member on the tip side of the screw is brought into contact with the engagement member, and in this state, the electric motor is activated. The tightening machine body is pressed against the object using a tool. As a result, the screw is screwed in using the bit.
゛When tightening such a screw, the screw in the tightening action position is held so that the heads of the plurality of screws of the screw connecting band following the screw do not come out by the retaining step in the guide path, and When tightening the screw, the band member left behind is held by the engaging member located on the extension of the guide path, so it maintains its normal posture in an extremely stable manner, and the screw is not tilted to the band member of the screw connecting band. Providing restraint strength also works effectively, so that the screw does not unnecessarily tilt toward the object and is screwed straight into the object.

゛[Example] The drawing shows an example of the continuous screw tightening machine of the present invention.
This continuous screw tightening machine is constructed by removably attaching a tightening machine body 10 around the rotating main shaft of a general-purpose portable power tool 1, as shown in FIG. A screw tightening bit 2 as shown in FIG. 2 is attached to the chuck at the tip of the rotating main shaft of the tool.
It constitutes the screw tightening mechanism.

As can be seen from FIG. 2 and FIGS. 4 to 6, the screw tightening machine main body [0 is a main body frame 11 attached to the power tool 1, and the bit 2 is oriented in the axial direction with respect to the main body frame 11. A sliding block 12 that is freely slidable is provided.

The body frame 11 has a flat rectangular cylindrical shape with one side open and has a length that allows the sliding block 12 to be accommodated therein, and as shown in FIG. A pair of protruding ridges 13 are provided opposite each other, and the protruding ridges 13 are fitted into V-grooves on both sides of the sliding block 12 to guide the sliding movement of the sliding blower 12.

In addition, as shown in FIGS. 2 and 3, the main body frame 1
A mounting member 18 is provided at the base end of the screw connecting band 3 to be mounted to the power tool 1 via a mounting fitting 17 of the housing case 1B.

Electrician A1 removes the base end of the sliding block 12 and the main body frame 11.
A main spring 20 is installed between the bit and the mounting member 18 to surround the bit. Is this main bullet spring 20 that? 11i is used to maintain the sliding block 12 at the pushing position shown in the figure at all times.

As shown in FIGS. 2 and 3, the storage case 1B for the screw connecting band 3 has an additional M21 that can be opened and closed, and the rotatable knob 22 provided on the storage case 18 is rotated by 90 degrees.
The lid 21 can be opened by letting the knob 22 escape from the hole 23 provided in the lid 21, and a screw connecting band 3 is installed inside the lid 21.
is housed in a spiral shape, and one end thereof is led out from the outlet 24 which is kept open at all times. It is sent to the tightening position.

As shown in Fig. 2, the screw connecting band 3 is made by connecting a large number of screws S, etc. in parallel at regular intervals using a band-like member B made of synthetic resin. It is formed to be hard enough to be filled. Furthermore, the synthetic resin band member B needs to have appropriate strength, as will be described later.

As can be seen from FIGS. 2, 4, and 6, the sliding block 12 has a hole 25 into which the bit 2 is inserted with a gap around the circumference, and the tip of the sliding block 12 An inner end block 26 is attached to the inner end block 26 so as to be located on the side of the extension line of the hole 25 for the bit 2. This tip block 2B forms a contact surface 27 whose tip surface comes into contact with an object into which a screw is screwed.

A concave groove 28 corresponding to a partial extension of the hole 25 for guiding the screw to be screwed is formed along the extension line of the hole 25. Since the length of the tip block 2B also needs to be changed, it is attached to the sliding block 12 with a set screw 28 so that it can be replaced.

The main body frame 11 and the sliding block 12 are provided with a screw connecting band 3.
A screw feeding mechanism is provided which sequentially feeds out each screw S to a tightening action position by the bit 2 in conjunction with the tightening operation in the screw tightening mechanism section.

To explain this screw feeding mechanism in detail, first,
2, 4 and 7 are shown on the sliding block 12.
As shown in the figure, a guide plate 3 for guiding the screw connecting band 3 led out from the outlet 24 of the storage case 16.
0.31 are placed opposite each other. These guide plates include a fixed side guide plate 30 fixed to the sliding block 12, and an outer guide plate 31 that is arranged opposite to the guide plate 30 and can be attached and detached by a screw 32 that accommodates a knob 33. The inner ends of both guide plates 30.31 reach near the position facing the bit insertion hole 25 drilled in the sliding block 12, and the length of both guide plates 30.31 is at least as long as the screw. In the continuous band 3, three screws S connected by the band member B are formed to such an extent that they are located between both guide plates 30 and 31.

Both guide plates 30 and 31 have a screw connecting band 3 between them.
A guide path is provided through which the screw S passes together with the band member B. Engagement step portions 34 and 35 are provided on the proximal end side of these guide plates, and the step portions 34 and 35 allow the screw connecting band 3 to pass through. A gutter-like portion is formed to hold and guide the enlarged head of each screw S so that it does not slip out. This gutter-like part is the screw S that will be screwed in from now on.
, that is, the bit insertion hole 25 in the sliding block 12
It does not engage with the head of screw S, which is an extension of
It engages with the head of the second screw S and holds it so that it does not slip out, thereby keeping the posture of the screw connecting band 3 stable when the screw S is screwed in, and as a result, the screw S is screwed in. This functions to prevent the screw S from tilting relative to the object.

On the other hand, as shown in FIG. 2, FIG. 8, and FIG. 9, a screw S is screwed into the sliding block 12 at a position beyond the tightening position of the bit 2 on the extension of the guide path. An engaging member 38 is provided to hold and guide the band-like member B that remains after the belt-like member B is removed.

This engagement member 38 prevents the strip member B, which has passed through the tightening position guided by the guide plate 30.31, from moving loosely in the direction of tightening the screw together with the screw screwed in by the bit in the next tightening operation. It is formed into a tunnel shape with a wall surface 38a that comes into contact with the outer surface side of the band-shaped member B, and is connected to the set screw 29 together with the tip block 2B.
It is attached to the sliding block 12 by. Further, the tip block 2B is also provided with a pin 4o that comes into contact with the band member B' for the same purpose.

As mentioned above, the tip block 26 is replaced depending on the length of the screw to be screwed in, and the position of the band member B in the screw connecting band 3 changes depending on the length of the screw. Therefore, it is necessary to also change the position of the abutting wall surface 38a of the engagement member 38 with the band-shaped member B. In order to adjust the position of the abutting wall surface 38a, the mounting portion 41 for attaching the tip block 2B to the sliding block 12 with the setscrew 29 has its height adjusted to the abutting wall surface of the strip member B on the engagement member 38. 38a, thereby causing the engaging member 38 to be aligned with the sliding block 12.
When the engaging member 38 is attached with the set screw 28, the abutting wall surface 38a of the engaging member 38 is attached at an appropriate position.

In addition, since the tip block and the engagement member need to be attached with a certain positional relationship as described above, they can also be integrated.

Since the screw S is tightened by holding the screw connecting band 3 and its band member as described above, the band member B is designed to hold the screw head in the guide path of the screw connecting band 3 and engage it as described above. By holding the strip member B by the member 38, the tightening force must be strong enough to prevent the screw S in the operating position from tilting during the tightening operation.

In addition, in order to sequentially send out the screws to the tightening action position along the above-mentioned guide path in conjunction with the tightening operation, the main body frame 11 is provided with a set of screws as shown in FIGS. An elongated grooved cam 43 extending in the sliding direction of the sliding block 12 is formed, and the inclined portion 43a on the tip side of the grooved cam 43 is approximately 4.
It is formed in a 5° bent state and ends at a position near the tip of the main body frame 11. The slider 45 fitted into the grooved cam 43 moves the pin 47 against the sliding block 12.
1 body frame 11 is attached to a rotatable lever 48.
As the sliding block 12 slides against the main bullet spring 20 , the sliding block 12 slides within the groove cam 43 to restrict the sliding range of the sliding blow 12 against the main body frame 11 . When pushed out by the lever 4B,
The screw to be tightened next is moved to the tightening position by swinging the screw.

That is, the lever 46 has its middle portion rotatably attached to the sliding block 12 by a pin 47, and the slider 45 is attached to one end of the lever 46, and a screw feed pawl 48 is attached to the tip surface of the other end. It is rotatably mounted on a shaft 48, and the screw feed pawl 48 is mounted on a lever 46 near the position.
A tension spring 50 is stretched between the slide block 12 and the slide block 12, and a biasing force in the direction of feeding the screw S is applied to the lever 48 to which the screw feeding claw 4 is attached.

As shown in detail in FIG. 10, the screw feed claw 4
8 has the claw portion 51 at its tip protrude into the guide path of the screw connecting band 3 through the hole provided in the guide plate 30, and the other end is brought into contact with the para 3 provided at the tip of the lever 46. When the screw feed pawl 48 moves in the direction of feeding the screw connecting band 3 by the lever 4B, the screw feed pawl 4 moves to the stopper 5 due to the force received by the engagement with the screw S.
3, the claw portion 51 is held in a state protruding into the guide path, and when the lever 46 returns in the direction opposite to the feeding direction of the screw connecting band 3, the claw portion 51 is held in a state where it protrudes into the guide path. The contact causes it to tilt and rotate so as not to protrude into the guide path. Further, the sliding block 12 has a recess 5 of the screw feed pawl 48 when the lever 46 is at the return end.
A spring rod 56 is provided which engages with 4. This spring rod 56
The screw feeding pawl is arranged so that the pawl portion 51 of the screw feeding pawl 48 protrudes into the guide path for engagement with the screw S when the lever 46 starts feeding the screw connecting band 3 from the return end. This applies a biasing force to 48.

Further, the body frame 11 is provided with an elongated hole 58 in a direction perpendicular to the straight line portion of the grooved cam 43, and the contact element 60 can be tightened at any position within the elongated hole 58 by screwing a knob 59. can be fixed, and on the other hand, on the inner surface of the sliding block 12,
A projecting wall 62 is provided which comes into contact with the contact element 60 when the sliding block 12 is pushed into the main body frame 11. This protruding wall 82 has an inclined surface 83 as the surface on which the abutting element 80 abuts, and regulates the sliding range of the sliding block 12 according to the position of the abutting element 60 in the elongated hole 58, and the screw to be tightened. The length and screw tightening should correspond to the depth.

In the continuous screw tightening machine having the above configuration, the guide plate 3
Insert the screw connecting band 3 between 0.31 and place the screw S to be screwed in first at the tightening action position by the bit 2,
The band member B on the tip side of the screw S is brought into contact with the pin 40 or the contact wall surface 38a of the engaging member 38, and in this state, the contact surface 27 of the end block 2B is applied to the object, and the power tool 1 is The tightening machine main body 10 is pressed against the object.

Through such an operation, the sliding block 12 is first pushed into the main body frame 11 against the biasing force of the main bullet firing spring 20,
Accordingly, the slider 45 attached to the tip of the lever 4 slides within the inclined portion 43a of the grooved cam 43, so the slider 45 rotates the lever 46 against the biasing force of the tension spring 50. Then, the screw feeding pawl 48 attached to the other end of the lever 46 moves in the return direction opposite to the feeding direction of the screw connecting band 3.
Get over the next screw.

In this case, the screw feed pawl 48 rotates due to contact with the screw binding band 3, and the pawl portion 51 does not engage with the screw binding band 3, so that the screw feeding pawl 48 does not move the screw binding band 3 and the screw Only the feed pawl 48 moves to a position beyond the next screw.

When the screw feed pawl 48 reaches the vicinity of the position where it passes over the next screw, the spring lever 56 provided on the sliding block 12 engages with the recess 54 of the screw feed pawl 48, and its biasing force causes the screw feed pawl 48 to pass over the next screw. The claw portion 51 is made to protrude toward the screw connecting band 3 side,
The claw portion 51 is surely engaged with the screw connecting band 3.

Further, when the tip of the bit 2 hits the head of the screw S in the tightening position due to the above operation, the bit 2 receives thrust and the rotation by the power tool 1 is transmitted, and the tip of the bit 2 hits the head of the screw S in the tightening position. The screw S is screwed into the object while being engaged with the head of the object. When the tightening machine body 10 is further pressed against the object against the biasing force of the main bullet spring 20, the screw S is screwed in due to the rotation of the bit 2, and during this time the slider 45 is moved in the straight line of the grooved cam 43. It will slide inside the part.

When tightening the screw S in this manner, the screw S in the tightening position is held in engagement with the screw connecting band 3 between the guide plates 3041, and in particular, the screw S connected as the screw connecting band 3 is
The head of the screw is held by the engagement steps 34 and 35 in the guide path so that it does not slip out, and the screw is further tightened by the band member B left behind by the engagement member 38 located on the extension of the guide path. This ensures that the screw S to be screwed in is guided to the concave groove 28 of the tip block 2B, and that the belt-like member of the screw connecting band 3 maintains a normal posture in an extremely stable manner. Having the strength to suppress the screw S is also effective as last month, so that the screw S does not tilt to the object unnecessarily and is screwed straight into the object.

After completing the tightening of the screw S and retracting the power tool 1,
The sliding block 12 protrudes from the main body frame 11 due to the biasing force of the main bullet spring 20, and the slider 45 moves toward the grooved cam 4.
3, the claw portion 51 of the screw feeding claw 48 engages with the next screw S in the screw connecting band 3 and moves the screw S to the tightening position. In this case, since the rotation of the screw feed pawl 48 is restricted by the stopper 53, the pawl portion 5 of the screw feed pawl 48
1 reliably engages with the next screw S and drives the screw connecting band 3 so that the screw S is moved to the tightening position.

The screw S that has been moved to the tightening action position waits at that position for the next screwing, and the same operation is repeated thereafter.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that the design can be changed without departing from the spirit of the claims. .

[Effects of the Invention] As described above, in the continuous screw tightening machine of the present invention, there is inevitably a movable part in the screw feeding mechanism that feeds each screw to the tightening action position by the bit, but screw tightening is difficult. Since there is no movable holding means that synchronizes with the tightening action of the screw to hold the screw or screw connecting band during operation, the overall structure of the device is significantly simplified, and delicate adjustments during use are not required. There is no need for continuous screw tightening, and a continuous screw tightening machine can be provided at low cost.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a side view showing the overall schematic configuration of the embodiment of the present invention, Fig. 2 is an enlarged side view of the main part, and Fig. 3 is a basic view of the tightening machine body. Figure 4 is a longitudinal sectional view of the tightening machine body, Figure 5 is a side view of the rear side of Figure 2, Figure 6 is a cross-sectional view of the tightening machine body, and Figure 7 is a cross-sectional view of the tightening machine body. A detailed view of the guide plate seen from the inlet side of the screw connecting band 3, Fig. 8 is a configuration diagram of the tip block and engagement member seen from the tip side of the tightening machine body, and Fig. 9 shows the exit of the band-shaped member. FIG. 10 is a cross-sectional view taken along the line A--A in FIG. 5. B... Band-shaped member, S... Screw, 2... Bit, 311. Screw connecting band, 34.
35...Step part, 38...Engagement member. Patent Applicant Muro Metal Industry Co., Ltd. Figure 3 Figure 7 Figure 8 Figure 10 189. i

Claims (1)

[Scope of Claims] 1. A screw tightening mechanism unit that tightens screws by rotating a screw tightening bit, and a screw connecting band in which a large number of screws are attached to a synthetic resin band member in parallel. A continuous screw tightening machine comprising: a screw feeding mechanism that sequentially feeds each screw to a tightening action position by the bit in conjunction with the tightening operation in the screw tightening mechanism; A guide path for the screw connecting band is provided to hold and guide the head of the screw connecting the connecting band to the engaging step so that it does not slip out, and a tightening action position by the bit is set on an extension of the guide path. An engaging member is provided at a position beyond which the band-like member of synthetic resin left after tightening the screw is prevented from moving in the direction of tightening the screw, and the band-like member of the screw-connecting band is connected to the guide path of the screw-connecting band. By holding the screw head and holding the band-shaped member by the above-mentioned engaging member, the screw in the tightening action position has enough strength to prevent it from tilting during the tightening operation. A continuous screw tightening machine characterized by eliminating a movable holding means that performs a screw holding operation according to the tightening operation. 2. A patent characterized in that a tip block is attached to the tip of a sliding block equipped with a screw feeding mechanism, with the tip end face being an abutment surface that comes into contact with an object, so that it can be replaced depending on the length of the screw. A continuous screw tightening machine according to claim 1. 3. The continuous screw tightening machine according to claim 2, wherein the replaceable tip block and the engagement member for suppressing the band-like member from moving loosely are fixed by the same fixing means.