JPS643631B2 - - Google Patents

Description

[Detailed description of the invention] The present invention drives a driver bit with a motor,
The present invention relates to an electric screwdriver device that performs screw tightening work using the bit.

Conventionally, there is an electric screwdriver device in which a motor and a driver bit are provided in the main body of the device, and a parts feeder is provided separately from the device main body. This device uses a motor to drive driver bits, while agitating screws stored in a parts feeder using air or the like to align them. Then, by sequentially feeding the aligned screws in front of the advancing driver bit, the driver bit tightens the screws one by one into the screw holes. However, in this conventional device, the main body of the electric screwdriver device and the parts feeder are provided separately, and the driver bit and the parts feeder are driven by separate drive sources, that is, a motor and air. Therefore, it has the disadvantage that the device becomes large.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a miniaturized electric screwdriver device.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an external view of the electric screwdriver device.
In the figure, a motor and deceleration mechanism housing section 10 is provided at the top of the device, and houses a motor (not shown), a deceleration mechanism (not shown) that decelerates the rotational output of the motor, and the like. Hopper 20 is storage part 1
It is formed around 0 and houses many screws. The parts feeder 30 is arranged below the hopper 20 and aligns the screws supplied from the hopper 20. The bit storage section 40 is the parts feeder 3.
The driver bit 50 is located below 0, and the rotation is transmitted from the speed reduction mechanism described above, and the bit 5
It houses the mechanism for lowering the 0. The screw guide groove 41a guides the screws aligned in the parts feeder 30 downward along the outer periphery of the bit storage section 40. The screw holding portion 60 is disposed at the lower end of the bit storage portion 40 and holds the screw guided along the screw guide groove 41a within the passage of the driver bit 50. In addition, 70 is a screw held at the tip of the screwdriver bit 50, 80 is an electric cord for supplying power to a motor (not shown), 90 is a hanging bracket for hanging the electric screwdriver device from the ceiling, etc., 100
is a lever for controlling a motor (not shown).

Next, each part of this device will be explained in detail.

First, the Hopper 20 will be described. FIG. 2 shows a cross section of the hopper 20 along line A-A. The hopper 20 includes an inner wall 21 surrounding the motor and reduction mechanism housing 10, an outer wall 22 formed on the outside of the inner wall 21, and ten partition walls 23a that partition the space between the two walls.
-23j are integrally molded from transparent plastic. The hopper 20 is rotatable around the storage section 10. formed by the inner wall 21, the outer wall 22, and the partition walls 23a to 23j
Each of the ten rooms 24a to 24j has an opening facing upward and downward in FIG. However, when the hopper 20 is assembled into the apparatus as shown in FIG. 1, the downward opening of the hopper is blocked by the ceiling 31 of the parts feeder 30, which will be described later. In this ceiling 31, each room 24a of Hopper
Opening 3 that is slightly larger than the downward opening of 24j
One 1a is formed. Steel ball 11 is in storage part 1
It is urged by a spring 12 provided at 0 to abut against the inner wall 21 of the hopper on the outside,
Click grooves 25a to 25j into which the steel balls 11 fit are formed in the hopper inner wall 21. These click grooves 25a to 25j correspond to each chamber 24a of the hopper.
24j, and any one of the hopper chambers 24a to 24j is click-stopped at a position corresponding to the opening 31a. In FIG. 2, the room 24j is an opening 31a in the ceiling 31.
Indicates a state that matches.

Therefore, screws are supplied to each of the hopper chambers 24a to 24j formed around the storage portion 10 from the upper openings of the chambers 24a to 24j, and each chamber is filled with screws. Arrow B in FIG. 1 indicates the direction in which screws are supplied to each chamber. Then, by manually rotating the hopper 20, each chamber 24a to 24j is aligned with the opening 31a, so that the screws stored in each chamber can be sequentially supplied to the parts feeder 30 through the opening 31a. A parts feeder (described later) to which screws are supplied through the opening 31a cannot perform an appropriate screw stirring operation even if too many screws are supplied. Yotsute Hopper rooms 24a-24j
The size of the parts feeder is determined so that the parts feeder can supply enough screws to perform an appropriate stirring operation. In this way, even if the parts feeder 30 runs out of screws, an appropriate amount of screws can always be supplied to the parts feeder simply by rotating the hopper 20.

Next, the parts feeder 30 will be described. Third
The figures are a sectional view taken along the line C-C in FIG. 1, FIG. 4 is a schematic perspective view of the parts feeder 30, FIG. 5 is a sectional view taken along the line D-D in FIG. A supplementary partial sectional view, FIG. 7, is a sectional view taken along the line E--E in FIG. 5.

In FIG. 3, reference numeral 10 denotes the aforementioned motor and deceleration mechanism housing, and the rotating shaft 13 receives the rotation of the motor (not shown) through the deceleration mechanism (not shown) and rotates with respect to the housing 10. . The outer wall 32 is formed to surround the storage section 10 and the rotating shaft 13. A parts feeder chamber 34 is formed around the storage section 10 and the rotating shaft 13 by this outer wall 32, the aforementioned ceiling 31, and the base plate 33. The ceiling 31 is fixed to the storage section 10, and 31, 32, and 33 do not rotate relative to the storage section 10. An appropriate amount of screws are supplied to the parts feeder chamber 34 from the hopper 20 through the opening 31a in the ceiling 31 as described above. arm 14
is fixed to the rotating shaft 13 and rotates integrally with this rotating shaft 13 within the parts feeder chamber 34 . A plastic member 15 formed in a sagging shape is fixed on one side to the arm 14, and also rotates together with the rotating shaft 13. As clearly shown in FIG. 4, the outer wall 32 is provided with a long hole 32a extending along its circumferential direction, and the width 32b of this long hole 32 in the vertical direction in FIG. It is smaller than the diameter and larger than the outer diameter of the threaded portion of the screw. A protruding wall 35 is provided at one end of the elongated hole 32a to face the elongated hole 32a, and the base plate 33 between the end of the elongated hole and the protruding wall 35 has a screw and a similar shape as clearly shown in FIG. In other words, a groove 41a having a T-shaped cross section is formed. The width 41b in the lateral direction of the groove 41a shown in FIG. 6 is larger than the diameter of the screw head, and the width 41c in the lateral direction is smaller than the diameter of the screw head and larger than the outer diameter of the threaded part, similar to the long hole 31a. Needless to say.

Next, the operation of the parts feeder 31 will be described. The rotating shaft 13 is rotated in the forward direction (clockwise rotation in FIGS. 4 and 5) and reverse rotation (counterclockwise rotation in FIGS. 4 and 5) by a motor (not shown) in the storage section 10. Let's do it. As for the amount of rotation between forward rotation and reverse rotation, as is clear from the operation of the bit which will be described later, the amount of forward rotation is greater than the amount of reverse rotation. The screws stored in the parts feeder chamber 34 are attached to a sag-like plastic member 15 that is linked to the rotating shaft 13.
is stirred by the rotation of the The screw portions of some of the screws that have been stirred penetrate into the elongated holes 32a. However, since the width 32b of the elongated hole is smaller than the diameter of the screw head, the screw will not protrude outside through the elongated hole 32a. Since the rotating shaft 13 has a large amount of forward rotation, when several screws penetrate into the elongated hole 32a, these screws are pushed by the member 15 or the feeder chamber 34.
The head is pushed by another screw inside, and the screws are sequentially fed clockwise in the aligned state as shown in FIG. When the screws fed in alignment reach the end of the elongated hole 32a, they face the groove 41a in FIG. 6 and fall downward along the groove 41a as shown in FIG. 7. In this way, the screws supplied from the parts feeder 30 are guided along the screw guide groove 41a in an aligned state.

The significance of providing the above-mentioned projecting wall 35 will be described next. If this projecting wall 35 is not provided, the screw stirred in the parts feeder chamber 34 will be located on the guide groove 41a with its screw portion facing inside the parts feeder chamber 34, and the screw head will be located on the guide groove 41a with the width 41b of the groove 41a. It may cover parts of the In other words, this screw prevents the screws aligned in the elongated hole 32a from being sent into the guide groove 41a. Further, if the projecting wall 35 is not provided, the screws being stirred in the parts feeder chamber 34 will come into contact with the screws aligned in the elongated hole 32a, disturbing their alignment. The protruding wall 35 is provided to eliminate such a defect, and by providing the projecting wall 35, the screws aligned in the long hole 32a can be properly sent to the guide groove 41a. In addition, the projecting wall 35 has a groove 41a in which the heads of the screws aligned in the elongated hole 32a are inserted.
It also has the role of guiding the screw so that it matches the width 41b of the width 41b.

Next, the screw guide groove 41a and the elongated hole 32a described above.
I will say a little more about this. Guide groove 4 with T-shaped cross section
As is clear from FIGS. 1 and 3, the screw 1a extends downward along the outer wall 41 of the bit storage section 40 and guides the screw to the lower end of the bit storage section 40. In this device, a part of the T-shaped guide groove 41a is opened toward the outside. That is, the guide groove 41
When the screw is guided downward through a, the tip of the screw is exposed outward as shown in FIGS. 3, 5, 7, and 8. ing. Also, the long hole 3 of the parts feeder 30
2a is also opened outward, and this elongated hole 3
When the screw is guided by 2a, Fig. 3, Fig. 5
As is clear from FIGS. 8 and 8, the screw is guided with the tip thereof exposed outward. However, in this device, the operator holds the parts feeder 30 and the bit storage section 40 in the vicinity thereof with the palm of his hand, and operates the lever 100 with the fingers of that hand. Therefore, in order to prevent the palm from pressing down on the aligned screws in the elongated hole 32a and the T-shaped guide groove 41a, the upper and lower walls of the elongated hole 32a and the walls on both sides of the guide groove 41a are raised to prevent the device from being pressed. The tips of the aligned screws are prevented from protruding. That is, long hole 3
Projecting walls 3 are provided above and below 2a along this elongated hole 32a.
2c and 32d, and a T-shaped guide groove 41
Projecting walls 41d, 4 along the groove 41a are provided on both sides of the groove 41a.
1e is provided, and the tip of the screw is connected to the protruding wall 32.
c, 32d, 41d, and 41e so as not to protrude. Even if you hold the parts feeder 30 and the bit storage section 40 in the vicinity by hand, the wall 32
Due to the presence of c, 32d, 41d, and 41e, the aligned screws are not pressed down. In this device, the lower end of the bit storage section 40 is not necessarily held by hand, so as is clear from FIGS. 1 and 3, no protruding walls 41d, 41e are provided at this portion. As described above, this device has the elongated hole 32a and the guide groove 41a open outward.
When the screw is no longer fed properly through the elongated hole 32a or the guide groove 41a, it can be corrected so that the screw is fed properly by operating the screw in the elongated hole 32a or the guide groove 41a from the outside.

In addition, this device allows the user to visually check the screws guided by the guide groove 41a, which is convenient because it is possible to know how many screws are left in the guide groove 41a.

Next, the bit storage section 40 and screw holding section 60 will be described. In FIG. 3, 13a is the rotating shaft 1
The cross section formed integrally with 3 is the rotation axis in the forward direction. As is clear from this diagram, the rotating shaft 13a rotates but does not slide vertically. The driver bit 50 is rotatably and vertically slidably supported within the bit storage section 40. Bit 5
0 has the aforementioned square cross-section rotating shaft 13a.
A square hole 51 into which the bit 50 is inserted is formed along the longitudinal direction of the bit 50. In the center of the bit 50, there are two helical cam grooves 52a, 52 on the outer periphery of the bit.
b is formed. Further, the lower end 53 of the bit 50 has a shape that matches the groove in the head of the screw 70. In this embodiment, since a so-called Phillips screw is used, the lower end 53 of the bit 50 is also the same as a Phillips screwdriver. Of course, when using a flathead screw, the lower end 53 of the bit must be formed in the same manner as a flathead screwdriver. Pins 42a, 42
b are opposed to each other with the bit 50 in between, one pin 42a is inserted into one cam groove 52a of the two-striped cam, and the other pin 42b is inserted into the other cam groove 52b of the two-striped cam.
are inserted into each. 43a and 43b are bearings arranged around the pin 42a, and 43c and 43d are bearings surrounding the pin 42a, respectively.
These are bearings arranged to surround b. These bearings 43a to 43d are connected to pin 4.
2a and 42b are provided so that they can easily rotate in their own circumferential direction. And bearings 43a-43
d and the pins 42a, 42b are supported by a donut-shaped support member 44, and this support member 44 is connected to the stepped portion 4.
5 so that it can rotate in its own circumferential direction. The pressing member 46 is also formed in the shape of a donut and is located on the support member 44 . The pin 47 is fixed to the bit storage portion 40 and prevents the pressing member 46 from rotating. The spring 48 acts to push down the pressing member 46, and between the member 44 and the pressing member 46,
Also, an appropriate frictional force is generated between the member 44 and the stepped portion 45. The pin 49 can move forward and backward into the guide groove 41a in conjunction with the vertical movement of the driver bit 50. The screw holding part 60 is composed of two members 61 and 62. The upper ends 61a and 62a of both members 61 and 62 are respectively fixed to the lower end of the bit storage portion 40, and both members are configured to surround the passage of the bit 50. The elastic ring 63 is placed over the outer periphery of both members 61 and 62, and is attached to the lower end 61.
b and 62b are biased so that they do not separate from each other. 62g is an opening through which the aligned screws pass.

Next, the operations of the bit storage section 40 and the screw holding section 60 will be described in detail. This apparatus is normally stopped in the states shown in FIGS. 1, 3, and 9. In this state, when the lever 100 shown in FIG. 1 is pulled toward the device, the storage section 10
The motor (not shown) inside starts rotating forward. Therefore, the rotating shaft 13a is
The driver bit 50 also attempts to start normal rotation (in the direction of the solid arrow in FIGS. 3 and 8 to 10). The state shown in Fig. 3 is as shown in Fig. 10.
2b has a pin 42b at its upper end. Of course, although not shown in FIG. 10, a pin 42a is also located at the upper end of the other cam groove 52a. Note that the pins 42a and 42b are located at the same height in the vertical direction, and are only shifted by 180 degrees. When the bit 50 tries to rotate forward in this way, the ends of the cam grooves 52a and 52b touch the pin 42.
It acts to push a and 42b and rotate them. As described above, a frictional force with the pressing member 46 and a frictional force with the stepped portion 45 act on the support member 44 that supports the pins 42a and 42b. However, in this case, since both ends of the cam grooves 52a, 52b are engaged with the pins 42a, 42b, the rotational force of the driver bit 50 is directly transmitted to the pins 42a, 42b. The rotating force of bit 50 overcomes the frictional force, and bit 5
0 integrally rotates the pins 42a, 42b and the support member 44 that supports them via bearings 43a to 43d provided around them in the forward direction. Since the bit 50 and the support member 44 rotate together, the bit 50 does not descend or ascend from the states shown in FIGS. 1, 3, and 9, but rotates only in the forward direction. Furthermore, the cam grooves 52a and 52b are formed to have an inclination of 90 degrees or less with respect to the longitudinal direction of the bit 50, except for the upper and lower ends of the grooves. hand
It has a 90° inclination. Therefore, no force is generated to lower or raise the bit 50. When the bit 50 rotates forward in this way, the lower end of the bit 5
The screw 70 held at 3 also rotates, and the screw 70 is screwed into a screw hole (not shown). The reason why the screw 70 is held at the lower end of the bit will be described later.

When the screw 70 is completely screwed into the screw hole (not shown) in this way, the screw 70 will no longer rotate. When the bit 50 stops rotating together with the screw 70, this driver device detects that the torque of the bit 50 has increased due to a mechanism and rotation (not shown), and stops the motor (not shown). When the present driver device is lifted in this state, the screw 70 remains in the screw hole (not shown) and only the present driver device rises. That is, the screw 70 and the bit tip 53 are separated. If the motor is stopped by the torque detection described above while the lever 100 is pulled toward the device, the motor will remain stopped even if the driver device is lifted. This state is the same as the state shown in FIG. However, the screw 70 is not held at the bit tip 53.

Next, when you release your finger from the lever 100, the lever 10
0 automatically leaves the device and returns to the state shown in FIG. In conjunction with the operation of this lever 100, the motor within the storage section 10 starts rotating in reverse.
Due to the reverse rotation of the motor, the rotating shaft 1 is
3a and bit 50 also rotate in reverse (Fig. 3, Fig. 8~
(in the direction of the dashed arrow in Figure 10). Due to the presence of the cam grooves 52a and 52b, the rotational force of the bit 50 is divided into a force that attempts to rotate the support member 44 in the same direction via the pins 42a and 42b, and a force that attempts to raise the bit 50. Ru. Pins 42a, 42b
The force that attempts to rotate the bit 50 in the same direction as the bit 50 is the result of dividing the rotational force of the bit 50, so it is naturally smaller than the rotational force of the bit 50. In other words, the force trying to rotate the pins 42a, 42b in the same direction as the bit 50 can overcome the force obtained by adding the frictional force between the supporting member 44 and the stepped portion 45 to the frictional force between the supporting member 44 and the pressing member 46. zu, pin 42
a, 42b and the support member 44 do not rotate on the stepped portion 45 together with the bit 50. In this way, the pins 42a and 42b are in the same state as if they were fixed to the bit storage section 40. Then, when the bit 50 rotates in the reverse direction, the pins 42a and 42b mentioned above move into the cam groove 52.
The bit 50 is raised along lines a and 52b. The bit 50 rises while rotating in the opposite direction from the states shown in FIGS. 1, 3, and 9. When the bit 50 starts to rise, the screws aligned in the guide groove 41a are in contact with the peripheral wall of the bit 50 due to their own weight. When the bit 50 rises and the bit tip 53 passes through the screw holding part 60, a mechanism (not shown) detects the rise of the bit 50 and urges the pin 49 to enter the guide groove 41a. However, since the bit 50 occupies the space within the guide groove 41a, the screw 71f remains in the state shown in FIG. 9. When the bit 50 rises further and its tip 53 reaches the screw guide groove 41a at the lower end of the bit storage part 40, the screw 71f becomes able to descend, and the pin 49 enters the guide groove 41a by the biasing force. In this way, the pin 49 is connected to the aligned screws 71g to 71j (the 11th
(see figure) from descending, and simultaneously pushes out the screw 71f located at the bottom of the guide groove downward. The screw 71f descends due to the force received from the pin 49 and its own weight. That is, as the bit 50 rises and retreats from the guide groove 41a, the screw 7
1f enters into the passage of the bit 50 along the guide groove 41a. At this time, the threaded portion of the screw 71f is
Passes 2g. This process is shown in Figures 11 and 12.
It is shown in FIG. When the tip of the bit 50 shown in FIG. 13 is completely retracted from the guide groove 41a, the screw 71f is guided into the guide groove 41a, and the screw head is supported by the steps 61d and 62d of the screw holding part 60. Bit 50 as shown in Figure 14
When the pin 42a rises by a predetermined amount, the pin 42a moves into one of the cam grooves 5.
2a, the pin 42b is connected to the other cam groove 52.
Each reaches the lower end of b. FIG. 15 clearly shows this situation. The figure shows a state in which the pin 42a has reached the lower end of the cam groove 52a,
The pin 42b also has a cam groove 52b at a position opposite to the pin 42a, as shown in FIG. In this way, the ends of the cam grooves 52a, 52b push the pins 42a, 42b due to the reverse rotation of the bit 50 (as shown by broken lines in FIGS. 14 and 15). Also in this case, similar to the engagement between the upper ends of the cam grooves 52a, 52b and the pins 42a, 42b, the rotational force of the driver bit 50 is directly applied to the pin 42.
a, 42b, this rotational force overcomes the frictional force between the support member 44 and the pressing member 46 and the frictional force between the support member 44 and the stepped portion 45, and the bit 50 moves to the pins 42a, 42b and 42b. The support member 44 will now rotate together. In this way, the bit 50 rotates in the opposite direction together with the support member 44 in the state shown in FIG. 14 without rising or falling. The lower ends of the cam grooves 52a and 52b are inclined at 90 degrees with respect to the longitudinal direction of the bit 50, similar to the upper ends described above. Therefore, when the support member 44 rotates with the bit 50, no force is generated that would raise or lower the bit 50. In this state,
When a motor reversal signal is issued from a timer circuit (not shown) which starts counting from the start of reverse rotation of bit 50, the motor shifts from reverse rotation to normal rotation.
It goes without saying that the timer time is set so that the motor reversal signal is issued after the screw 71f has completed its movement to the position shown in FIG. When the bit 50 starts normal rotation (shown by solid lines) from the state shown in FIGS. 14 and 15, the rotational force of the bit is divided into forces in two directions by the cam grooves 52a and 52b, similar to when the bit 50 rises. be done. That is, the force is divided into a force that attempts to rotate the support member 44 in the same direction via the pins 42a and 42b, and a force that attempts to lower the bit 50. The force that causes the support member 44 to rotate in the same direction as the bit 50 is obtained by dividing the rotational force of the bit 50.
It is smaller than the rotational force of 0. That is, the support member 44
The force trying to rotate the pin 42a in the same direction as the bit 50 cannot overcome the force obtained by adding the friction force between the support member 44 and the step portion 45 to the friction force between the support member 44 and the pressing member 46, and the pin 42a, 42b and the support member 44 do not rotate on the stepped portion 45 together with the bit 50. Therefore, when the bit 50 rotates forward, the pins 42a and 42b lower the bit along the cam groove. The bit tip 53 is a screw held by a screw holding part 60 (see Fig. 13).
comes into contact with the head of Since the bit 50 descends while rotating in the forward direction, the bit tip 53 and screw 7
The head of the screw 71f is immediately aligned with the head of the screw 71f, and the screw 71f comes to rotate together with the bit 50. Bit 50
is lowered, and the head of the screw 71f is at the stepped portion 61d,
62d, the bit tip 53 is strongly pressed against the groove of the screw head, and the two become engaged due to a so-called wedge action. In this state, the bit 50 tries to fall. The stepped portions 61d and 62d are slightly inclined toward the bit passage, and these inclined surfaces act to assist the bit in pushing out the screw 71f.
That is, when the bit 50 attempts to descend further, the head of the screw 71f pushes the opposite lower ends 61c, 62c of the screw holding part 60 apart against the biasing force of the elastic ring 63 due to the action of the inclined surfaces of the step parts 61d, 62d. . Then, as shown in FIG. 16, the head of the screw 71f escapes from the stepped portions 61d and 62d. When the bit 50 further descends, the screw 71f held at the tip comes into contact with the inclined surfaces 61f and 62f of the screw holding portion. The inclined surfaces 61f and 62f become wider toward the lower end of the holding portion 60, as shown in FIG. Therefore, as the screw 71f descends, the lower end of the holding portion 60 is closed. When the screw head reaches the lowest end of the inclined surfaces 61f and 62f as shown in FIG. 17, the opposing lower ends 61c and 62c come into contact with each other, and the inclined surfaces 61c and 62c and the screw head do not come into contact with each other. The reason why the slopes 61f and 62f are provided on the screw holding part 60 is to prevent the screw 71f from separating from the bit tip 53 when the bit tip 53 descends through the holding part 60. In other words, the screws 71 are installed on the small diameter side of the slopes 61f and 62f.
When the heads of f are in contact, the slopes 61f and 62
The slopes 61f and 62f are stronger than the force which tries to pull the screw 71f from the bit tip 53.
The force trying to pinch the head of screw 1f from both sides is stronger, and the screw head is held by the slopes 61f and 62f. Therefore, even if the screw head descends while contacting the slopes 61f and 62f due to the downward movement of the bit tip, the screw 71f will not come off from the bit tip 53. In this way, the slopes of the slopes 61f and 62f are determined. When the screw head is located at the large diameter part of the slopes 61f, 62f as shown in FIG. There is no force required to pull the screw 71f away from the tip 53. When the screw 71f protrudes from the screw holding part 60 in this way, the bit tip 53
This prevents the screw 71f from coming off.

When the bit 50 is lowered in this manner, the bit tip 53 protrudes from the lower end of the screw holding member 60. The screw 71f remains engaged with the bit tip 53 due to the wedge action described above. Further, the pin 49 is retracted from the screw guide groove 41a by a mechanism not shown in the process of the bit 50 transitioning from FIG. 16 to FIG. 17, and the aligned screws 71g,
71h and 71i are each lowered by their own weight, resulting in a state similar to that shown in FIG. Figure 1, Figure 3, Figure 9
As shown in the figure, when the bit 50 protrudes a predetermined amount from the screw holding part 60, the pins 42a and 42b reach the upper ends of the cam grooves 52a and 52b, and the bit 50 does not descend together with the support member 44.
0 continues to rotate at that position. A timer circuit (not shown) starts counting from the start of normal rotation of the bit 50 (from the state shown in FIG. 14), and issues a motor stop signal when a predetermined period of time has elapsed. Then stop the motor. This motor stop signal is set by bit 50 as shown in FIG.
The predetermined time is set so that the signal is emitted after the states shown in FIGS. 3 and 9 are reached. When the rotation of the bit 50 is stopped by the motor stop signal in this manner, the original state shown in FIGS. 1, 3, and 9 is restored. Then, when the lever 100 is pulled toward the device, the above-described operation is repeated.

As described above, in this driver device, the screw is held at the tip 53 of the driver bit 50, and the bit 50 protrudes from the main body of the device. Therefore, it is easy to work, and even if there is a protrusion around the screw hole, the main body of the device will not come into contact with the protrusion.

Next, the operations of the electric screwdriver device described so far are briefly summarized. First, when the operating lever 100 is pulled with the bit 50 stopped, the bit 50 starts to rotate forward together with the screw 70. When the screw 70 is tightened into the screw hole, the bit 50 stops rotating due to torque detection. When the driver device is raised, the bit tip 53 and screw 70 are removed, and the operating lever 100 is restored, the bit 50
goes up while reversing and hides inside the main body of the device.
When the bit 50 rises to a predetermined position and is rotated normally again by a circuit not shown, the bit 50 begins to fall. When the bit 50 rises, the screw 71f is fed into the passage of the bit 50, and when the bit 50 descends, the head of the screw 71f engages with the bit tip 53 and is held. When the bit further descends and protrudes a predetermined amount from the main body of the driver device, the bit 50 stops rotating by a circuit (not shown).
Further, as the bit 50 rotates, the parts feeder 30 stirs the screws, and the screws are fed out from the parts feeder 30 in an aligned state. As is clear from the operation of bit 50,
The bit rotates more in the forward direction than in the reverse direction, and the parts feeder 30 operates as described above.

Next, a case will be described in which the bit 50 becomes unable to rise or fall while rising or falling. For example, when bit 50 is on the way down,
If the screw 71f is not properly seated in the state shown in FIG. 13, the bit 50 will be prevented from descending by the screw 71f. In such a case, in this driver device, the rotational force of the bit 50 directly acts to rotate the support member 44, so that the support member 44 and the bit 50 move together on the stepped portion 45, overcoming the above-mentioned frictional force. Rotate. In other words, even if the bit is prevented from rising or falling while rising or falling, the device will not be damaged due to the rotation of the support member 44.

Further, when the bit 50 is prevented from rising or falling in this way, the opening 62f of the screw holding portion 60 or the screw guide groove 41a opened outward
The cause of inhibiting the operation of the bit 50 can be removed through the .

In order to guide the screw more reliably into the state shown in FIG. 13, it is preferable to provide the bit 50 with a magnetic force and use a magnetic material (for example, iron) as the screw.
The operation in this case is as follows. That is, in the process of transition from FIG. 11 to FIG. 13, the magnetized tip 53 of the bit attracts the head of the screw 71f, and as the bit 50 rises, this screw 7
1f is guided into the passage of the bit 50 along the guide groove 41a. And when bit 50 rises further,
The upper wall of the guide groove 41a prevents the screw 71f from rising, and only the bit 50 rises. In this way, the state shown in FIG. 13 is reliably obtained. Also, in this case, when the bit 50 descends, the bit tip 53
The screw 71f is attached to the bit 5 by the wedge action of the screw 71f and the magnetic force of the bit 50.
It is held at the tip of 3. By doing so, the screw 71f can be held at the bit tip 53 more reliably than in the embodiment described above. Other operations are similar to those of the embodiment described above.

In the embodiments described so far, the screw 71f is supported by the stepped portion 61d, the screw 71f is pressed against the descending bit tip 53, and engagement between the two is achieved by a wedge action. In other words, the screw holding portion 60 had to be designed to generate a force that would achieve engagement between the two. However, when the bit 50 is magnetized and a magnetic material is used as the screw, the screw holding part 6
0 does not necessarily have to be designed that way. In such a case, the screw holding portion only needs to support the screw, and when the bit tip 53 and the screw head groove match as the bit is lowered, the screw 71f is held at the bit tip 53 only by the magnetic force. Even when the bit 50 protrudes below the screw holding portion 60, the screw 71f is held at the bit tip 53 only by the magnetic force. In this way, conditions similar to those shown in FIGS. 1, 3, and 9 are obtained. The rest operates in the same manner as the embodiment described above, so the explanation will be omitted.

However, this embodiment cannot be used with screws made of non-magnetic material such as brass. Needless to say, in order to be able to hold both a screw made of non-magnetic material and a screw made of magnetic material at the tip of the bit, the above-mentioned embodiment of engagement by wedge action may be used.

Although the embodiments in which the bit is magnetized and the screw is made of a magnetic material have been described, the screw may be magnetized and the bit made of a magnetic material.

In the embodiment described above, the bit 50 is provided with two cam grooves (two-row cam), and one of the cam grooves is provided with the pin 42.
A pin 42b was fitted into the other cam groove. However, it is possible to use only one cam groove and one pin. As mentioned above, if you use two or more cam grooves and two or more pins, you can achieve bit 5.
It goes without saying that the rotation of 0 is stable.

Further, in the embodiment, a cam groove was provided on the bit 50 and a pin was provided on the support member 44, but instead, a pin was provided on the bit 50 protruding and a cam groove into which the pin was fitted was provided on the support member 44. Good too.

As described in detail above, according to the present invention, the parts feeder is provided around the rotating shaft driven by the motor, and the screws in the parts feeder are stirred by the stirring member fixed to this rotating shaft. It is possible to drive and stir the screw, and the device can be made smaller.

[Brief explanation of drawings]

Fig. 1 is an external view of the electric screwdriver device, Fig. 2 is a sectional view taken along the line A-A of the hopper 20, Fig. 3 is a sectional view taken along the line C-C in Fig. 1, and Fig. 4 is a parts feeder 3.
0 is a schematic perspective view of 0, FIG. 5 is a sectional view taken along the line D-D in FIG. 8 is a sectional view for explaining the relationship between the bit 50 and the rotating shaft 13a and the shape of the screw guide groove 41a, and FIG. 9 is a sectional view showing the state when the bit is lowered at the lower end of the device. , Fig. 10 is a diagram showing the relationship between the cam groove and the pin when the bit is lowered, Figs. 11 and 12 are sectional views showing the state when the bit is rising at the lower end of the device, and Fig. 13 is a diagram showing the state when the bit is rising at the lower end of the device. FIG. 14 is a sectional view corresponding to FIG. 3 when the bit is raised, FIG. 15 is a diagram showing the relationship between the cam groove and the pin when the bit is raised, and FIGS. 16 and 17 are FIG. 3 is a sectional view showing a state in which the bit is being lowered at the lower end of the device. Explanation of symbols of main parts, 13...Rotation axis, {1
4... Arm, 15... Sagging plastic member} Stirring member, 30... Parts feeder, 41a
...Screw guide groove...Screw positioning means, 50...
driver bit.

Claims (1)

[Claims] 1. A rotating shaft driven by a motor, a driver bit that receives rotational force from the rotating shaft and advances while rotating, and a parts feeder that stirs and aligns a plurality of stored screws. and a means for positioning aligned screws in a passage of the advancing screwdriver bit, wherein the parts feeder is formed around the rotating shaft, a stirring member is fixed to the rotating shaft, and the parts feeder is formed around the rotating shaft, and a stirring member is fixed to the rotating shaft; An electric screwdriver device characterized in that the screws in the parts feeder are stirred by rotation of a stirring member. 2. The means for positioning the screws is characterized in that the screws aligned in the parts feeder are guided into the path of the advancing driver bit through a guide hole provided along the outer periphery of the device body around the driver bit. An electric screwdriver device according to claim 1.