JP2007210041A - Screw fastening machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw fastening machine comprising: an impact mechanism for applying a rotational impact torque in the screw fastening direction to a screw fastening driver bit; and a screw feeding device for supplying a large number of screws one by one to a screw fastening position, the screw fastening machine which can intercept a driving system by sensing the stroke of the screw fastening machine body in the screw fastening direction corresponding to the fastening amount of the screw. <P>SOLUTION: An electric motor 11 (a driving system) is intercepted by means of a body sensing means 40 for sensing the upper stroke end of a feeder box 32, which the screw fastening axial stroke of the screw fastening machine body 10 accompanies, with respect to a case 31 in a screw feeding device 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screw tightening machine provided with a rotary impact mechanism (so-called impact mechanism).

For example, Japanese Patent No. 3268026 discloses a technique related to a screw tightening machine provided with an impact mechanism for applying impact in the screw tightening direction to a spindle. The impact mechanism is configured to apply a large screw tightening force to the driver bit when the external torque (screw tightening resistance) above a certain level is applied to the driver bit and the hammer is struck against the anvil in the screw tightening direction. Therefore, according to the screw tightening machine provided with this impact mechanism, a large screw tightening torque can be obtained, which is suitable for tightening a relatively long screw.
Japanese Patent No. 3628486 discloses a technique related to a screw tightening machine including a screw feeding device for supplying screws to be tightened one by one. The screw feeding device is configured to supply screws one by one to the front of the driver bit by pitch-feeding a screw coupling band holding a number of screws in parallel at regular intervals in conjunction with the screw tightening operation. Therefore, according to the screw tightening machine equipped with the screw feeding device, it is not necessary for the operator to set the screws one by one in the driver bit, so that the screw tightening operation can be continuously performed. The screw tightening work can be performed efficiently. Normally, this screw feeder can be easily attached to and detached from the screw tightening machine body according to the work mode.
Furthermore, this type of screw tightening machine usually includes an electric motor as a drive source, and requires a mechanism that cuts off the drive path when the screw tightening is completed.
For example, the former Japanese Patent No. 3268026 has a torque-sensitive clutch separately from the impact mechanism, and the impact mechanism is reduced by making the torque setting value of this clutch smaller than the torque setting value at which the impact mechanism operates. When the screw tightening torque reaches the set value without being activated, the clutch is disengaged and the electric motor is de-energized, and the torque set value is made larger than the torque set value at which the impact mechanism operates. Therefore, a configuration is disclosed in which the impact mechanism can be switched to an impact state (a clutch directly connected state) when the screw tightening torque reaches a set value. In the latter impact state, the screw tightening is disclosed. Intermittent driving force when the torque reaches the set value and the hammer separates and strikes against the anvil Is done.
Further, in the latter patent No. 3628486, the spindle gradually advances as the screw is tightened, and the meshing of the clutch teeth gradually becomes shallower. A clutch mechanism is disclosed.
As described above, as a method for interrupting the drive path after the screw tightening is completed in the screw tightening machine, the drive path is interrupted when the screw tightening torque applied to the spindle reaches a certain value, There is a configuration in which the drive path is cut off when the tightening depth reaches a certain value.
Japanese Patent No. 3628486 Japanese Patent No. 3268026

However, in the case of a screw tightening machine equipped with an impact mechanism, when the screw tightening torque reaches a set value, the hammer is detached from the anvil, and the driving force is intermittently performed by repeatedly hitting, and the screw tightening is performed. This is different from the configuration in which the meshing clutch is disengaged by moving the spindle in the axial direction with the progress of.
On the other hand, in the case of using the above-described screw feeder, it is difficult to visually confirm the tightening amount of the tightening screw. Therefore, the power is substantially based on the stroke of the screw tightening machine main body corresponding to the tightening amount of the screw. It is desirable to adopt a configuration that shuts off.
Therefore, the present invention is a screw tightening machine equipped with an impact mechanism that is particularly effective for securely tightening a long screw and a screw feeding device that is suitable for an operation for tightening a number of screws easily and continuously. An object of the present invention is to provide a screw tightening machine capable of shutting off a drive system based on a stroke of a screw tightening machine body corresponding to the tightening depth of the screw.

For this reason, this invention was set as the screwing machine of the structure described in each claim of a claim.
According to the screw tightening machine of the first aspect, the main body stroke detecting means detects the stroke (movement distance in the screw tightening axis direction) when the screw tightening machine main body is tightened. The stroke of the screw tightener body corresponds to the screw tightening depth. The main body stroke detecting means detects that the main body of the screw tightening machine has moved in the direction of the screw tightening axis, and based on this, the drive system of the screw tightening machine main body is shut off and the screw tightening operation is stopped.
In this way, by adopting a body stroke detecting means for detecting the stroke of the main body of the screw tightening machine and thus the screw tightening depth, a configuration is adopted in which the spindle is moved in the axial direction in the screw tightening machine equipped with the impact mechanism. The operation of the screw tightener main body can be automatically stopped when the screw is properly tightened.
In this specification, “screw tightening shaft direction” is used to mean the screw shaft direction when the screw is rotated and tightened, and “screw tightening direction” is the screw rotated and tightened. It is used to mean the direction of rotation when you go.

According to the screw tightening machine of claim 2, when the tip of the feeder box of the screw feeder is brought into contact with the screw tightening material, and the screw tightening machine main body is moved in the screw tightening axial direction in this contact state, The feeding device interlocks with this to supply one screw at a time to the screw tightener body. The supplied screw is tightened into the screw tightening material by moving the screw tightening machine main body in the screw tightening axial direction. The screw is fastened to the screw tightening material by moving the screw tightening machine main body in the screw tightening axial direction by a preset distance. When the screw is properly tightened into the screw tightening material, the stopper portion of the feeder box comes into contact with the stroke restricting portion of the case, and this is detected by the sensor. When it is detected by this sensor that the stopper portion is in contact with the stroke restricting portion, the drive system of the screw tightening machine main body is shut off and the screw tightening operation is stopped.
From the above, according to the screw tightening machine according to claim 2, even when an impact mechanism is provided, the spindle on the screw tightening machine main body side is moved in the axial direction, and the meshing clutch is shut off using this, for example. Without adopting the configuration, the operation of the screw tightening machine main body can be stopped simultaneously with the completion of the screw tightening.
According to the third aspect of the present invention, when the screw feeder case is attached to and removed from the screw tightener main body, the sensor is electrically connected to and disconnected from the drive circuit. . For this reason, when attaching and detaching the screw feeder to the screw tightening machine main body, it is not necessary to separately connect or disconnect the sensor drive circuit, and therefore, the handleability of the screw feeder can be improved.
According to the screw tightening machine of the fourth aspect, it is possible to easily cope with a change in the tightening depth of the screw to be tightened.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the entire screw tightening machine 1 according to the present embodiment. In the figure, the screw tightening machine 1 is shown in a direction in which the screw tightening axis direction coincides with the vertical direction in the figure. Therefore, in the following description, the vertical direction is a direction along the screw tightening axis direction, and in particular, the downward direction in the drawing is the direction of progress of the screw when the screw is tightened.
The screw tightening machine 1 includes a screw tightening machine main body 10 and a screw feeding device 30 attached to the tip (lower part in the drawing) of the screw tightening machine main body 10.
The screw tightening machine main body 10 includes a handle portion 2 on a side portion thereof. A rechargeable battery 3 is attached to the tip of the handle portion 2. The electric motor 11 as a drive source of the screw tightening machine 1 is activated using the battery 3 as a power source. A trigger-type switch lever 4 is disposed at the base of the handle portion 2. When the switch lever 4 is pulled by a hand holding the handle portion 2, the electric motor 11 is started.
The output of the electric motor 11 is transmitted to the spindle 13 through the planetary gear mechanism 12. The spindle 13 is supported so as not to move in the axial direction, and an impact mechanism 20 is connected to the tip side thereof. The impact mechanism 20 includes a hammer 21 supported so as to be axially movable with respect to the spindle 13 and rotatable about the axis, and an anvil 22 supported relative to the tip of the spindle 13 so as to be relatively rotatable. The anvil 22 is rotatably supported coaxially with the spindle 13 via a sleeve-shaped bearing 14 attached to the front end (lower end in the figure) of the main body case 15 of the screw tightener main body 10.
A compression spring 23 is interposed between the hammer 21 and the spindle 13. The hammer 21 is always urged forward (downward in the drawing) in the axial direction relative to the spindle 13 by the compression spring 23.
Further, two steel balls 24 and 24 are sandwiched between the hammer 21 and the spindle 13. The two steel balls 24, 24 are sandwiched between the groove 13a on the spindle 13 side and the groove 21a on the hammer 21 side, respectively. The groove 13 a on the spindle 13 side is formed along a direction inclined with respect to the axis of the spindle 13. On the other hand, the groove 21 a on the hammer 21 side is also formed along a direction inclined with respect to the axis of the spindle 13. For this reason, the hammer 21 rotates relative to the spindle 13 while being displaced in the axial direction. The upward movement of the hammer 21 relative to the spindle 13 (upward displacement in the figure) is performed against the compression spring 23. For this reason, by appropriately setting the urging force of the compression spring 23, it is possible to set the screw tightening resistance at which the impact at the time of screw tightening is started.

Under the hammer 21, striking arm portions 21 b and 21 b are provided at two equal positions around the axis of the spindle 13. On the other hand, striking portions 22 a and 22 a are also provided on the upper portion of the anvil 22 at a position equally divided by two around the axis of the spindle 13. The hammer 21 and the striking arm portion 21b on the side of the hammer 21 are brought into contact with the striking portion 22a on the side of the anvil 22 in the rotational direction, so that the hammer 21 and the anvil 22 are integrated with respect to rotation in the screw tightening direction. Thirteen rotations are transmitted to the anvil 22.
A driver bit 25 is coaxially mounted on the front end side of the anvil 22. The driver bit 25 rotates integrally with the anvil 22.
According to the impact mechanism 20 configured as described above, for example, when the screw tightening resistance with respect to the driver bit 25 and the anvil 22 is gradually increased in the final stage of screw tightening to overcome the urging force of the compression spring 23, the hammer 21 Moves upward against the compression spring 23, whereby the striking arm portions 21 b and 21 b of the hammer 21 are disengaged from the striking portions 22 a and 22 a of the anvil 22. Then, since the screw 21 is not subjected to the screw tightening resistance, the hammer 21 is reversely applied by the biasing force of the compression spring 23 and the tilting action of the grooves 13a and 13a and the grooves 21a and 21a via the steel balls 24 and 24. It moves downward (advances) along the axial direction while rotating with respect to the spindle 13. Thus, the hammer 21 is rotated around the axis of the spindle 13 and moved downward, so that the two striking arm portions 21b and 21b of the hammer 21 are each struck against the striking portion 22a of the anvil 22 in the screwing rotation direction. A rotational striking force in the screw tightening direction is applied to the anvil 22 and thus the driver bit 25. By repeatedly applying the rotational impact force of the hammer 21 to the anvil 22, the screw is tightened firmly.

Next, the screw feeder 30 has a function of supplying screws S one by one to the front (downward in the drawing) of the driver bit 25 in conjunction with the screw tightening operation of the screw tightener main body 10. 10 is attached to the front. The screw feeder 30 includes a case 31 having a rectangular cross section, and a feeder box 32 supported by the case 31 so as to be able to move up and down (forward and backward) along the screw tightening axis direction.
The case 31 has a so-called split structure that is integrated by fastening the fixing screws 31a to 31a. The case 31 is fixed to the screw tightening machine main body 10 by tightening one thumbscrew 38 with the bearing 14 of the screw tightening machine main body 10 inserted in the upper portion thereof, whereby the screw feeding device 30 is screwed. It is attached to the front part of the fastening machine body 10. If one thumbscrew 38 is loosened, the case 31 and thus the screw feeder 30 can be removed from the screw tightener main body 10. The state which removed the screw feeder 30 from the screwing machine main body 10 is shown by FIG. In the figure, only the screw hole into which the thumbscrew 38 is tightened is shown.
A driver bit 25 is inserted substantially along the inside of the case 31. A compression spring 33 is interposed between the case 31 and the feeder box 32. The feeder box 32 is pushed to the screw fastening material W side (downward in the figure) by the compression spring 33.
An intermediate gear 34 and a ratchet wheel 35 that meshes with the intermediate gear 34 are rotatably supported on the feeder box 32. The intermediate gear 34 is provided with an arm 34a. The arm 34a is supported so as to be tiltable within a certain angle range around the rotation axis of the intermediate gear 34. In addition, this arm 34a is integrated with the intermediate gear 34 only in one direction (screw feed direction described later, counterclockwise direction in the figure), and relatively in rotation in the reverse direction (clockwise direction in the figure). It can be rotated. That is, the intermediate gear 34 and the ratchet wheel 35 described later rotate intermittently only in the screw feed direction and do not rotate in the opposite direction.

A guide roller 36 is supported at the tip of the arm 34a. The guide roller 36 enters a guide groove 31 b provided on the side of the case 31. The guide groove 31b is formed along the moving direction of the feeder box 32 (the axial direction of the driver bit 25, the vertical direction in the figure). As shown in the figure, the lower fixed range of the guide groove 31 b is inclined with respect to the moving direction of the feeder box 32. For this reason, the guide roller 36 enters the inclined portion of the guide groove 31b in the vicinity of the lower moving end in the movement range of the feeder box 32 with respect to the case 31. Hereinafter, in the guide groove 31b, a range along the axis of the driver bit 25 is referred to as a straight portion, and an inclined range is referred to as an inclined portion.
As shown in FIG. 1, the feeder box 32 is located at the lower moving end with respect to the case 31, and the guide roller 36 is located at the inclined portion of the guide groove 31b (the screw tightener body 10 is at the upper moving end. When the screw tightening machine main body 10 starts to move downward from the position in the position, the feeder box 32 starts to move upward relative to the case 31. Then, since the guide roller 36 moves along the inclined portion, the arm 34a is tilted at a constant angle in the counterclockwise direction (left side in the figure), whereby the intermediate gear 34 rotates at a constant angle in the same direction. When the intermediate gear 34 rotates counterclockwise in the figure, the ratchet wheel 35 rotates by a certain angle in the clockwise direction (screw feed direction) indicated by the arrow in the figure.

A screw connection band SB is loaded between the ratchet wheel 35 and the feed base 37 provided below the ratchet wheel 35. The screw connection band SB is a resin band in which a large number of screws S are held in parallel one by one at regular intervals. Engagement claws 35a to 35a provided on the outer periphery of the ratchet wheel 35 are engaged. Has been. For this reason, when the ratchet wheel 35 is rotated by a certain angle in the screw feeding direction, the screw coupling band SB is fed to the left in FIG. 1 by one pitch, thereby moving the feeder box 32 up and down relative to the case 31 and thus the screw tightening machine main body. In conjunction with the ten screw tightening operation, one screw S is supplied to a position coaxial with the driver bit 25. The feed rear end side of the screw connection band SB is a holding portion 5 provided so as to be bridged between the distal end of the handle portion 2 of the screw tightening machine main body 10 and the protruding piece portion 31 c provided on the side portion of the case 31. It is inserted and held in the holding groove 5a.
When the screw tightener main body 10 further moves down and the feeder box 32 moves up with respect to the case 31, the guide roller 36 enters the straight portion of the guide groove 31b. At the stage where the guide roller 36 moves along the straight portion of the guide groove 31b, the arm 34a does not tilt, so that the ratchet wheel 35 is held at a fixed rotational position, and the supplied single screw S is connected to the driver bit 25. And is held in a coaxial position.

In the middle of the further downward movement of the screw tightener main body 10, the tip of the driver bit 25 that rotates about the axis by the activation of the electric motor 11 abuts against the head of one screw S supplied to the coaxial position. Then, the screw S is tightened onto the screw tightening material W by moving the screw tightening machine main body 10 downward as it is.
When the screw tightening resistance applied to the driver bit 25 increases as the screw S is tightened, as described above, the impact mechanism 20 applies a rotational striking force in the screw tightening direction to the driver bit 25. It will be tightened firmly.
When the screw S is tightened to a predetermined depth, the feeder box 32 reaches the upper moving end position with respect to the case 31, and at this time, the screw tightening machine body 10 reaches the lower moving end position. The state at this stage is shown in FIG. A stopper portion 45 is provided on a side portion of the feeder box 32. On the other hand, the case 31 is provided with a stroke restricting portion 41. As shown in FIG. 2, the upper moving end position of the feeder box 32 with respect to the case 31 is restricted by the stopper portion 45 coming into contact with the stroke restricting portion 41. A proximity sensor 42 is attached to the stroke restricting portion 41. The proximity sensor 42 detects that the stopper portion 45 of the feeder box 32 has come into contact with the stroke restricting portion 41, and based on this, the electric motor 11 is stopped. This will be described later.
After the screw tightening of the screw S is completed, the feeder box 32 moves downward relative to the case 31 when the screw tightening machine body 10 is returned upward. When the feeder box 32 reaches the vicinity of the lower moving end, the guide roller 36 enters the inclined portion from the straight portion of the guide groove 31b. At this stage, the guide roller 36 moves along the inclined portion of the guide groove 31b, so that the arm 34a tilts to the right side (counter screw feeding direction) in FIG. The arm 34a is not engaged with the intermediate gear 34 when it is tilted in the anti-screw feed direction. For this reason, the intermediate gear 34 does not rotate in the anti-screw feed direction, and therefore the ratchet wheel 35 does not rotate in the anti-screw feed direction.

As described above, according to the illustrated screw feeder 30, the screws S are supplied one by one to the coaxial position with the driver bit 25 in conjunction with the vertical movement operation of the screw tightener body 10. Further, when the screw tightening machine body 10 is moved downward toward the screw tightening material W, the supplied screw S is tightened into the screw tightening material W by the driver bit 25. When the screw tightening machine main body 10 reaches the lower moving end, and therefore the feeder box 32 reaches the upper moving end position with respect to the case 31, the screw tightening is completed. When the screw tightening is completed, the stopper portion 45 comes into contact with the stroke restricting portion 41, thereby restricting the lower end position of the screw tightening machine main body 10, which is detected by the proximity sensor 42.
A connector 42b is connected to the end of the wiring 42a of the proximity sensor 42. The connector 42b is fixed to the upper end portion of the case 31. On the other hand, the screwing machine main body 10 is provided with a drive circuit 43 that controls the start and stop of the electric motor 11 and the like. A connector 43b is connected to the drive circuit 43 via a wiring 43a. The connector 43b is fixed near the lower end of the body case 15 of the screw tightener body 10.
When the case 31 and thus the screw feeder 30 are attached to the screw tightener main body 10, the connector 42b is coupled to the connector 43b. When the connector 42b is coupled to the connector 43b, the proximity sensor 42 is electrically connected to the drive circuit 43. When the stopper portion 45 comes into contact with the stroke restricting portion 41, the proximity sensor 42 is turned on, and this on signal is output to the drive circuit 43 via the wirings 42a and 43a. When the ON signal of the proximity sensor 42 is input to the drive circuit 43, the power supply to the electric motor 11 is cut off, thereby stopping the electric motor 11. For this reason, when the screw tightening of the screw S is completed and the screw tightening machine main body 10 reaches the lower moving end, the electric motor 11 is automatically stopped. From this, in the case of this embodiment, the stopper part 45, the stroke control part 41, the proximity sensor 42, etc. mainly comprise the main body stroke detection means 40.
After the stop, when the pulling operation of the switch lever 4 is released, the ON signal of the proximity sensor 42 is reset. Therefore, if the switch lever 4 is pulled again after that, the electric motor 11 is started and the screw tightening operation can be performed.

Next, the stroke restricting portion 41 is supported so that its position can be changed with respect to the case 31. The stroke restricting portion 41 is provided with a support piece portion 41a. The support piece portion 41a protrudes to the side of the case 31 and reaches the inside of the hollow portion 31d provided in the protruding piece portion 31c. An adjustment screw 44 is supported on the projecting piece 31c so as to be rotatable about its axis. The adjustment screw 44 is located in a state of straddling the hollow portion 31d in the vertical direction. The adjusting screw 44 is engaged with a screw hole provided in the support piece 41a of the stroke restricting portion 41 located in the hollow portion 31d. For this reason, the position of the stroke restricting portion 41 can be adjusted up and down by rotating the adjusting screw 44 around its axis.
A disc-shaped adjustment dial 46 is attached to the adjustment screw 44. By rotating the adjustment dial 46, the adjustment screw 44 can be rotated about its axis, and therefore the position of the stroke restricting portion 41 can be adjusted in the vertical direction. The stroke restricting portion 41 can be adjusted in position within a range in which the support piece portion 41a can move up and down within the hollow portion 31d.
By adjusting the vertical position of the stroke restricting portion 41, the upper moving end position of the feeder box 32 with respect to the case 31 can be changed, whereby the tip of the driver bit 25 is supplied to the coaxial position of the screw S. The stroke (screw tightening depth) of the screw tightening machine body 10 from the time of contact with the head to the time when the tightening of the screw S is completed and the head almost reaches the upper surface of the screw tightening material W. ) Can be changed.

The screw tightening machine 1 according to the present embodiment described above includes the impact mechanism 20 that strikes the driver bit 25 in the screw tightening rotation direction when the screw tightening resistance becomes a certain level or more. When the machine main body 10 reaches the lower end and the screw tightening is completed, the electric motor 11 is automatically stopped by the main body stroke detecting means 40. Therefore, in the screw tightening machine 1 provided with the impact mechanism 20, the stroke of the screw tightening machine main body 10 is adopted without adopting a configuration in which the spindle 13 is moved in the axial direction and the meshing clutch (drive system) is disconnected based on this. Therefore, it is possible to provide the screwing machine 1 that can shut off the drive system (in the case of the present embodiment, the electric motor 11) based on the above.
The proximity sensor 42 of the main body stroke detection means 40 is electrically connected to the drive circuit 43 by coupling the connector 42b on the case 31 side of the screw feeder 30 and the connector 43b on the screw tightening machine main body 10 side. Connected. The connector 42b and the connector 43b are automatically coupled together when the screw feeder 30 is attached to the screw tightener main body 10. For this reason, if the screw supply device 30 is attached to the screw tightening machine main body 10 without separately connecting the connector 42b to the connector 43b, the main body stroke detecting means 40 is activated, whereby the screw tightening machine The convenience of 1 can be improved.
Furthermore, since the position of the stroke restricting portion 41 can be adjusted by rotating the adjustment dial 45, it is possible to quickly cope with a change in the tightening depth of the screw S to be applied. Usability of the fastening machine 1 can be improved.

Various modifications can be made to the embodiment described above. For example, the configuration in which the proximity sensor 42 is used to detect when the stopper portion 45 is in contact with the stroke restricting portion 41 is illustrated, but a configuration using another sensor such as a photoelectric sensor or a limit switch instead of the proximity sensor is also possible. Good.
Furthermore, although the structure which can adjust the position of the stroke control part 41 was illustrated, it is good also as a structure which abbreviate | omitted this and the position of the stroke control part was fixed. In this case, the support piece 41a, the adjustment screw 44, and the adjustment dial 46 of the stroke restricting portion 41 can be omitted.
Although the screw tightening machine 1 using the battery 3 (DC power supply) as a power source is illustrated, the screw tightening machine according to the present invention can be similarly applied to a screw tightening machine using an AC power source as a power source.

It is a side view which shows the internal structure of the whole screw fastening machine which concerns on embodiment of this invention. This figure has shown the state which the screwing machine main body is located in an upper moving end position. It is a side view which shows the lower part of the screwing machine which concerns on embodiment of this invention, and the internal structure of a screw supply apparatus. This figure shows a state in which the screw tightening machine main body is located at the lower end position. It is a side view which shows the lower part of the screwing machine which concerns on embodiment of this invention, and the internal structure of a screw supply apparatus. This figure has shown the state which removed the screw supply apparatus from the screwing machine main body. For this reason, in this figure, the state in which the connector of the proximity sensor is separated from the connector of the drive circuit is shown.

Explanation of symbols

W ... Screw fastening material 1 ... Screw fastening machine 4 ... Switch lever 10 ... Screw fastening machine body 11 ... Electric motor (drive system)
DESCRIPTION OF SYMBOLS 13 ... Spindle 14 ... Bearing 15 ... Main body case 20 ... Impact mechanism 21 ... Hammer 22 ... Anvil 25 ... Driver bit 30 ... Screw feeder 31 ... Case 32 ... Feeder box 34 ... Intermediate gear 35 ... Ratchet wheel 36 ... Guide roller SB ... Screw connection band, S ... Screw 40 ... Main body stroke detecting means 41 ... Stroke regulating portion 42 ... Proximity sensor 42b ... Connector 43 ... Drive circuit 43b ... Connector 44 ... Adjustment screw 45 ... Stopper portion 46 ... Adjustment dial

Claims (4)

A screw feeding device for pitch-feeding a screw coupling band in which a large number of screws are connected in parallel using a stroke in a screw tightening axial direction of a screw tightening machine body using an electric motor as a drive source. And a screw tightening machine equipped with an impact mechanism for adding a blow in the rotational direction of the screw tightening to the anvil equipped with the driver bit,
And a main body stroke detecting means for detecting a stroke of the screw tightening machine main body in a screw tightening axial direction, and driving the screw tightening machine main body based on a stroke of the screw tightening machine main body detected by the main body stroke detecting means. Screw tightening machine designed to shut off the system. The screw tightening machine according to claim 1,
The screw feeding device includes a case that is detachably attached to the screw tightening machine body, a feeder box that strokes in the axial direction of the screw tightening with respect to the case, and a feed of the screw connection band in conjunction with the stroke of the feeder box. With a ratchet wheel rotating in the direction,
The main body stroke detecting means is provided with a stopper portion in the feeder box, while providing a stroke restricting portion for restricting a stroke of the feeder box with respect to the case by contacting the stopper portion with the case.
A screw tightening machine in which a sensor for detecting the stopper is attached to the stroke restricting portion. 3. The screw tightening machine according to claim 2, wherein the drive circuit on the screw tightening machine main body side and the sensor are electrically connected by combining the connector on the case side and the connector on the screw tightening machine main body side. The case-side connector and the screw tightening machine main body side connector are coupled and separated as the case is attached to and detached from the screw tightening machine main body. 3. The screw tightening machine according to claim 2, wherein the stroke restricting portion is provided so as to be position-adjustable with respect to the case in a screw-tightening axial direction, and the position adjustment is performed by rotating a dial. Fastening machine.

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