JPH0616652Y2 - Electric screwdriver with screw supply function - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric screwdriver used for tightening mechanical screws.

[Conventional technology and its problems]

As a conventional electric screwdriver, one in which the tip of the bit is magnetized is known, and the advantage of this kind of electric screwdriver is that the screw tightening operation can be performed with one hand. Describing the general screw tightening operation performed using such an electric screwdriver, the worker first attaches the screw to the tip of the bit of the electric screwdriver with its magnetic force and applies it to the place where the screw should be fixed. Then, the bit is rotated by an electric motor, which causes screw tightening. When attaching the screw to the bit tip, it is necessary to apply the bit tip to the screw head. Therefore, when performing such a screw tightening operation, a so-called screw tray having a large number of screw accommodating holes is used, and screws are arranged in the screw accommodating holes with their heads facing upward. In short, in the case of the conventional electric screwdriver, the work of attaching the screw to the tip of the bit by its magnetic force is performed every time the screw tightening operation is performed.

In order to eliminate such troublesome and troublesome work of attaching the screw, a screwdriver which automatically supplies the screw to the tip of the bit of the screwdriver is disclosed in, for example, Japanese Patent Publication Nos. 47-877 and 56-46957. Although disclosed, however, these known drivers utilize a compressed air source to automatically feed the screws, which makes the screw feeding mechanism a complicated and expensive arrangement.

[Purpose and structure of device]

The purpose of the present invention is an electric screwdriver with a screw supply function that eliminates the work of attaching the screw with the magnetic force to the tip of the bit every time the screw tightening operation is performed like a conventional electric screwdriver. Accordingly, it is an object of the present invention to provide an electric screwdriver with a screw supply function that is configured to perform screw supply by a simple manual operation without requiring a special drive source for screw supply.

An electric screwdriver with a screw supply function according to the present invention includes an electrically driven bit stem, an inner tube member that rotatably accommodates the bit stem, and a slidable and rotatably arranged outside the inner tube member. An outer pipe member and a screw supply case member that is detachably attached to the outer pipe member. The screw supply case member has a plurality of screw accommodating holes parallel to the axis of the bit stem. Moreover, it is formed around it at equal intervals. The electric screwdriver with screw supply function according to the present invention is further provided with a screw take-out mechanism attached to the outer pipe member at a lower portion of the screw supply case member, and the screw take-out mechanism is non-rotating with respect to the outer pipe member. Upper non-rotating member supported in a state, a lower rotating member supported in a non-rotating state with respect to the outer pipe member, and located between the upper non-rotating member and the lower non-rotating member. The intermediate rotating member is rotatably supported around the outer pipe member. The upper non-rotating member is formed with a screw accommodating hole portion that can be aligned with one of the screw accommodating holes of the screw supply case member, and the lower non-rotating member is formed with a screw discharging hole for intermediate rotation. A screw take-out hole is formed in the member, the intermediate rotary member has a first alignment position where the screw take-out hole is aligned with the screw accommodating hole of the upper non-rotating member, and the screw take-out hole is the screw ejecting hole of the lower rotary member. It is pivotable between a second alignment position aligned with the hole. The electric screwdriver with a screw supply function according to the present invention is further provided with a screw guide member extending from the screw discharge hole of the lower non-rotating member of the screw take-out mechanism beyond the tip of the bit of the bit stem. The tip portion is curved so as to be axially aligned with the bit tip, and an opening is formed above the tip portion of the screw guide member so that the bit tip can enter the tip portion. The assembly including the screw supply case member, the screw take-out mechanism, and the screw guide member is provided between the lower position and the upper position relatively along the axis of the bit stem by the sliding action of the outer pipe member with respect to the inner pipe member. And the bit tip is in an unscrewed position when the assembly is in the down position and the bit tip is in a screwed position when the assembly is in the up position. To be done. The electric screwdriver with screw feeding function according to the present invention further includes elastic spring means for elastically biasing the assembly to the lower position, and an assembly from the lower position to the upper position against the elastic force of the elastic spring means. Cam means for rotating the intermediate rotation member from the first alignment position to the second alignment position so as to supply the screw to the screw guide member from the predetermined screw accommodation hole of the screw supply case member when moved. It is provided. The cam means comprises a cam groove formed in the inner pipe member and a pin element that penetrates the outer pipe member from the intermediate rotating member and engages with the cam groove. It is helical so as to cause a pivotal movement between the aligned position and the second aligned position.

In the electric screwdriver having the screw supply function configured as described above, the tip end of the screw guide member is brought into contact with the screwing position so that the bit stem is inserted into the opening of the screw guide member and the elastic force of the elastic spring means is applied. When pushed against, the assembly is moved relative to the bit stem from a lower position to an upper position so that the screw is automatically fed to the bit tip.

〔Example〕

An embodiment of an electric screwdriver with a screw supply function according to the present invention will be described with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, an electric screwdriver having a screw feeding function according to the present invention is generally shown, which includes a cylindrical housing 10 and the cylindrical housing 10.
Of the electric motor 12, the reduction gear mechanism 14 mounted on the output shaft side of the electric motor 12 and accommodated in the cylindrical housing 10, and extending downward from the output shaft of the reduction gear mechanism 14. And cylindrical housing 1
0 of the bit stem 16 protruding from the lower side.

As shown in FIG. 2, an annular plate member 18 is arranged in an intermediate portion inside the cylindrical housing 10.
8 is fixed to the housing 10 by a mechanical screw 20. One end of the inner pipe member 22 is fixed to the annular plate member 18 by the action of the tightening screw 23. That is, the annular plate member 18 is formed with a slot (not visible from FIG. 2) extending from its central hole to its outer periphery, and by tightening the tightening screw 23 across the slot, the annular plate member 18 is The central hole is narrowed so that one end, that is, the upper end of the inner pipe member 22 is fixed to the annular plate member 18. As can be seen from FIG. 2, the bit stem 16 is rotatably inserted through the inner pipe member 22, and the tip of the bit is projected from the inner pipe member 22.

As shown in the figure, an outer pipe member 24 is slidably arranged on the outer side of the inner pipe member 22, and the upper end of the outer pipe member 24 is located in the center hole of the annular plate member 25 as in the case of the annular plate member 18. Fixed in a manner. The lower end of the outer pipe member 24 has a third
A plate member 26 having a substantially semi-circular shape as shown in the figure is fixed, and this fixing mode is also the same as in the case of the annular plate member 18. Therefore, the plate member 26 has a slot extending from its central hole to its outer periphery. And a tightening screw 28 is screwed across the slot. An annular plate member 30 is disposed on the upper surface of the plate member 26 so as to be rotatable around the axis of the bit stem 16 (that is, around the outer pipe member 24), and the upper surface of the annular plate member 30 is An annular plate member 32 is arranged, and this annular plate member 32 is also fixed to the outer pipe member 24 by a tightening screw 34 in the same manner as the plate member 26.

A spool-shaped member 36 is arranged between the annular plate member 25 and the annular plate member 32. The spool-shaped member 36 comprises a sleeve element 38 adapted to rotate around and slidable about the outer tube member 24, and an annular flange 40 provided at each end of the sleeve element 38. . The spool-shaped member 36 is adapted to accommodate a cylindrical screw supply case member 42 as shown in FIG. 5, and therefore the screw supply case member 42 has a groove portion 44 extending from the outer periphery to the center thereof. Is formed.
As shown in FIG. 1, when the screw supply case member 42 is housed in the spool-shaped member 36, first, the opening side of the groove portion 44 of the screw housing case member 42 is directed toward the sleeve element 38 of the spool-shaped member 36, and the groove portion is formed. By receiving the sleeve element 38 in the center of 44, the screw feed case member 42 is housed in the spool-shaped member 36 in a manner such that its opposite ends are aligned with the respective annular flanges 40 of the spool-shaped member 36. become. As shown in FIG. 1, a protrusion 45 is provided on the lower annular flange of the annular flange 40 of the spool-shaped member 36, and the protrusion 45 is located in the groove 44 when the screw supply case member 42 is accommodated. The spool-shaped member 3
The rotation of the screw supply case member 42 with respect to 6 is prevented.

As is clear from FIG. 5, a plurality of screw housing holes 46 are formed in the screw supply case member 42, and these screw housing holes 46 are parallel to the axis of the bit stem 16 when the screw supply case member 42 is housed. Moreover, it is arranged at equal intervals around it. In this embodiment, nine screw housing holes 46 are provided, and these housing holes 46 are arranged at equal intervals of 30 ° with respect to the axis of the screw housing case member 42. On the other hand, the lower annular flange 40 of the spool-shaped member 36 has hole portions (FIGS. 1 and 2) arranged similarly to the screw accommodating holes 46.
(Not visible in the figure) is formed and the screw supply case member 42 is housed in the spool-shaped member 36,
Each of the screw receiving holes 46 of the screw supply case member 42 is aligned with the corresponding hole of the lower flange 40.

As shown in FIG. 4, a hole 48 is formed in the annular plate member 32, and the hole 48 is aligned with a predetermined one of the holes of the lower annular flange 40. On the other hand, the annular plate member 3
A similar hole 50 (shown by a broken line in FIG. 4) is also formed in 0, and the hole 50 can be aligned with the hole 48 of the annular plate member 32. That is, the annular plate member 3
As will be described in detail later, 0 is designed to rotate about the axis of the bit stem 16 over an angular range of 30 °, and when the annular plate member 30 rotates for 30 °, the broken line in FIG. The hole portion 50 indicated by is aligned with the hole portion 48 of the annular plate member 32.

Further, as shown in FIG. 4, a fan-shaped notch 52 is formed along a part of the outer periphery of the annular plate member 32, and the fan-shaped notch 52 has a raised portion 54 protruding upward from the annular plate 30.
Is housed. As can be seen from FIG. 1, the ridge 54
A bore is formed in the bore and a spring-biased plug element 56 is slidably received in the bore. As shown, the top of the plug element 56 slightly projects from the upper surface of the ridge 54, and the projection has an inclined top surface. In other words, the left end (in FIG. 1) of the protrusion projects somewhat higher than the right end, so that the inclined top surface is downward in the right direction in FIG. Such protrusions are spool-shaped members 3
6 is engaged in a complementary recess 58 formed in the bottom of the lower annular flange 40. Such a plug element 5
For engagement of the projections of 6 with the recesses 58, the plug element 5
When the annular plate member 30 is rotationally moved by 30 ° in such a manner that 6 moves to the left in FIG. 1, the spool-shaped member 36 is also rotationally moved by 30 ° accordingly. If the rotational movement of the profiled member 36 is mechanically blocked, as will be described later, the plug element 56
Of the spool-shaped member 36
Is prevented from rotating. Also, the plug element 56
The engagement of the protrusions with the recesses 58 is also such that due to the inclined top surface of the protrusions, it also functions as a one-way clutch. That is, even if the annular plate member 30 is returned to its original position after the spool-shaped member 36 is rotated by 30 ° with the rotational movement of the annular plate member 30 as described above, the spool-shaped member 36 is It does not return to its original position. This is because the projection of the plug element 56 can easily come out of the recess 58 due to its inclined top surface.

As shown in FIG. 3, a hole 60 is formed in the substantially semicircular plate member 26, and this hole 60 is normally aligned with the hole 50 of the annular plate member 30. That is, it has already been described that the annular plate member 30 is rotationally moved over the angular range of 30 °, but in this case, the hole portion 50 of the annular plate member 30 on one side of the angular range has the plate member 26. Hole 60
And the annular plate member 32 on the other side of the angular range.
Will be aligned with the holes 48 of the plate member 30, and the annular plate member 30 will normally be positioned such that its holes 50 are aligned with the holes 60 of the plate member 26.

In this embodiment, the upper annular plate member 32 fixed to the outer pipe member 24 so as not to rotate with respect to the bit stem 16 and the outer pipe so as not to rotate with respect to the bit stem 16. A lower plate member 26 fixed to the member 24 and an annular plate member 30 arranged between the annular plate member 32 and the plate member 26 so as to be rotatable around the axis of the bit stem 16 are screwed. A screw take-out mechanism for taking out a screw from the screw accommodating hole 46 of the supply case member 42 will be configured, and its operation will be described later.

As shown in detail in FIG. 2, one end of the screw guide member, that is, the screw guide tube 62, that is, the upper end of the screw guide member, that is, the upper end of the screw guide member 62 is fixed to the hole 60 of the substantially semicircular plate member 26 by the action of the tightening screw 64 (FIG. 3). It It will be apparent that such a fixing mode is the same as the fixing of the annular plate member 26 to the outer pipe member 24. The screw guide tube 62 is curved in the manner shown in FIG. 2 so that the tip portion 64 of the screw guide tube 62 is aligned with the bit of the bit stem 16 on its longitudinal axis. As is apparent from FIGS. 1 and 2, an opening 66 is formed above the tip portion 64 of the screw guide tube 62 so that the bit of the bit stem 16 can enter the tip portion 64. It As can be seen from FIG. 1, a pair of leaf spring elements 68 are provided at the lower end of the tip portion of the screw guide tube 62 for temporarily holding the screw. In short, the screw guide tube 62
Is the screw supply case 42 by the above-mentioned screw take-out mechanism.
Has a role of guiding the screw taken out from the screw receiving hole 46 to the front position of the tip of the bit of the bit stem 16 and temporarily holding the front position.

In this embodiment, the screw supply case member 42 accommodated in the spool-shaped member 36, the above-described screw take-out mechanism for taking out a screw from the screw accommodation hole 46 of the screw supply case member 42, and the screw take-out mechanism take out the screw. An assembly composed of a screw guide tube 62 for guiding the inserted screw to the bit tip of the bit stem 16 is supported by an outer pipe member 24 axially slidable with respect to the inner pipe member 22. become. Such an assembly has a bit stem 16 and a lower position as shown in FIGS.
Of the bit is moved between an upper position adapted to project from the lower end of the distal end portion 64 of the screw guide tube 62, in which case when the assembly is placed in the lower position, It will be apparent that the bit tip is in the unscrewed position and that the bit tip is in the screwed position when the assembly is in the down position. As shown in FIG. 2, a coil spring 70 is disposed between the annular plate member 18 and the annular plate member 25, and the coil spring 70 allows the above-mentioned assembly to be normally used in FIGS. It will be elastically biased to the lower position as shown in the figure.

As best shown in FIG. 1, a rectangular support plate piece 72 is attached to the annular plate member 18 by a mechanical screw 74, and a micro switch 76 is supported on the support plate 72. The micro switch 76 includes an operating lever 78,
The actuating lever 78 is adapted to be actuated by a rod element 80 extending upright from the annular plate member 25. That is, when the assembly described above is moved from the lower position (FIGS. 1 and 2) to the upper position, the rod element 80 engages the actuating lever 78 of the microswitch 76, causing the microswitch 76 to turn on. "It will be done. When the micro switch 76 is turned “on”, the electric motor 12 is started and the bit stem 16 is rotationally driven. Note that, in FIGS. 1 and 2, the rod element 80 placed in such an upper position is shown by a chain line.

As shown in FIG. 6, the inner tube member 22 has a cam groove 82 spirally extending along the axial direction thereof, and a cam groove 82.
A long groove 84 extending in the axial direction is formed at a position above 2. The circumferential interval between the lower end and the upper end of the spiral cam groove 82 is 3 at an angle about the axis of the inner pipe member 22.
Corresponds to 0 °. On the other hand, holes 86 and 88 are formed in the outer pipe member 24, and when the outer pipe member 24 is placed in the lower position as shown in FIGS. 1 and 2, the holes 8 are formed.
6 is located at the lower end level of the cam groove 82, and the hole 88 is located at the lower end level of the elongated groove 84. As shown in FIG. 1, a radial bore 90 is formed in the annular plate member 26, and a pin element 92 is accommodated in the radial bore 90, the tip of which is in the central hole of the annular plate member 30. And protrudes through the hole 86 of the outer pipe member 24 and engages with the cam groove 82 of the inner pipe member 22. Further, as shown in FIG. 1, a radial bore 94 is also formed in the annular plate member 25, and a pin element 96 is accommodated in the radial bore 94, and at this time, the tip end portion thereof is the annular plate member 2.
5 protrudes into the center hole of the inner pipe member 5 and penetrates the hole 88 of the outer pipe member 24 to be engaged with the elongated groove 84 of the inner pipe member 22.

As is apparent from such a configuration, when the above-mentioned assembly is moved from the lower position to the upper position, the annular plate member 30 is moved.
30 due to the engaging action of the pin element 92 and the cam groove 82.
It will be rotated and moved over an angle of °.

Next, referring to FIGS. 7A to 7E of the accompanying drawings,
The operation of the electric screwdriver with the screw supply function described above will be described. 7A to 7E are views in which a sectional view of the above-mentioned assembly along the circumferential direction is developed on a plane.

FIG. 7A shows the relative position of its components when the assembly described above is in the down position as shown in FIGS. 1 and 2. As is apparent from FIG. 7A, in such a lower position, one of the screw accommodating holes 46 of the screw supply case member 42 accommodated in the spool-shaped member 36 has one hole 48 of the upper non-rotating member, that is, the annular plate member 32. The holes 48 accommodate the screws supplied from the screw accommodating holes 46. On the other hand, the lower non-rotating member, that is, the hole portion 60 (upper end opening portion of the screw guide tube member 62) of the plate member 26 has an angle of 3 degrees from the hole portion 48.
They are arranged on the right side (in FIG. 7A) with a gap corresponding to 0 °. Intermediate rotating member, ie, annular plate member
0 is placed in such a position that its hole 50 is aligned with hole 60.

For example, the operator grips the cylindrical housing 10 of the electric screwdriver with a screw supply function and holds the tip portion 64 of the screw guide tube 62.
Is applied to the place to be screwed, and then the cylindrical housing 10 is pressed downward, the bit stem 1
The bit tip of No. 6 penetrates into the tip 64 of the screw guide tube 62 through its opening 66, and the assembly described above slides relatively upward along the bit stem 16. At this time, as shown in FIG. 7B, the hole 50 of the intermediate rotating member 30 is the hole 48 of the upper non-rotating member 32.
By the engaging action of the pin element 92 and the cam groove 82, the pin element 92 and the cam groove 82 are rotated. Here, the point to be noted is that the head of the screw housed in the hole 48 is made to project somewhat into the corresponding hole of the lower annular flange 40 of the spool-shaped member 36. That is,
Due to the engagement of the plug element 56 and the recess 58, even if the spool-shaped member 36 tries to move with the rotational movement of the intermediate rotating member 30, the head of the screw in the hole 48 causes
This is the point at which the rotational movement of the spool-shaped member 36 is blocked. In this case, as described above, the plug element 5
6 will come out from the recess 58.

When the above assembly is moved to the upper position, the 7C
As is apparent from the figure, the intermediate rotary member 30 has the hole 5
0 is rotationally moved to a position aligned with the hole portion 48 of the upper non-rotating member 32, and as a result, the screw accommodated in the hole portion 48 is accommodated in the hole portion 50 of the intermediate rotating member 30. . Then, when the worker releases the downward pressing force on the electric screwdriver with the screw supply function, the relative positional relationship of the constituent members of the above-described assembly returns to the same state as in FIG. The screw housed in 50 drops into the screw guide tube 62 and is temporarily held by the pair of leaf spring elements 64 at the tip 64 thereof. By sequentially performing such screw taking-out operations, one of the screw receiving holes 46 of the screw supply case member 42, that is, one of the screw receiving holes aligned with the hole 48 is taken out.

On the other hand, when the above-mentioned assembly is placed in its upper position, that is, when its constituent members are in the relative positional relationship as shown in FIG. 7C, the bit tip of the bit stem 16 is the tip of the screw guide tube 62. The electric motor 14 is driven by reaching a position slightly protruding from the lower end of the portion 64 and turning on the microswitch 76 as described above. Therefore, the bit stem 16 is rotated, and the tip of the bit is screwed.
At this time, at the tip portion 64 of the screw guide tube 62, the screw taken out from the screw accommodating hole 46 of the screw supply case member 42 by the previous screw taking-out operation is held in advance by the pair of leaf spring elements 64.

FIG. 7D shows a state in which the screw in the screw accommodating hole 48 aligned with the hole portion 48 of the upper non-rotating member 32 is the last one, and the screw taking-out operation in this case is also the same as described above. It is similar to the case.

FIG. 7E shows the screw take-out operation after all the screws in the screw accommodating holes 48 aligned with the holes 48 of the upper non-rotating member 32 have been taken out. Upper non-rotating member 32
Since there are no screws in the screw accommodating holes 48 that are aligned with the holes 48 of the
6 and the recess 58, when the intermediate rotary member 30 is intended to rotate with the rotational movement of the intermediate rotary member 30, the rotary movement is not blocked, and therefore, the spool-shaped member 36 is not blocked.
Is rotationally moved together with the intermediate rotating member 30 as shown in FIG.
The screw take-out operation as described above is performed by being aligned with the hole 48 of the.

The embodiment described above is for explaining the present invention,
It is not intended to limit the invention. Therefore,
Various modifications may be made to the illustrated embodiments within the technical scope of the present invention.

For example, the spool-shaped member 36 may be eliminated, and the screw supply case member 42 may be arranged directly on the upper non-rotating member 32. In this case, the recess that engages with the plug element 56 will be formed at an appropriate position on the bottom surface of the screw supply case member 42.

Alternatively, the plug element 56 and the recess 58 for rotating the screw supply case member 42 may be eliminated, and the screw supply case member 42 may be manually rotated.

Furthermore, although the screw guide tube 62 is used in the above-described embodiment, the screw guide tube may be formed by using at least three wire elements.

[Effect] As is clear from the above description, in the electric screwdriver with a screw supply function according to the present invention, a new screw is supplied to the tip of the bit each time the screw is tightened, so Since the work of attaching the screw to the tip of the bit after each screw tightening operation is eliminated, according to the present invention,
The efficiency of screw tightening operation can be greatly improved.

Further, in the present invention, since a drive source such as a compressed air source is not required for screw supply, the screw supply function can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a front view of an electric screwdriver having a screw supply function according to the present invention, in which a part is cut away and another part is shown in section, and FIG. 2 is a left side view of FIG. FIG. 3 is a view corresponding to a drawing, and most of which is shown as a cross section, FIG. 3 is a plan view of one of the constituent members of the embodiment of FIG. 1, that is, a lower non-rotating member, and FIG. FIG. 5 is a plan view of one of the constituent members of the embodiment shown in FIG. 1, that is, an upper non-rotating member, FIG. 5 is a plan view of one of the constituent members of the embodiment of FIG. 1, that is, a screw supply case member, and FIG. FIG. 7A to FIG. 7E are explanatory views for explaining the operation of the electric screwdriver with the screw supply function according to the present invention. is there. 10 ... Cylindrical housing, 12 ... Electric motor, 14 ... Reduction gear mechanism, 16 ... Bit stem, 22 ... Inner pipe member, 24 ... Outer pipe member, 26 ... Lower non-rotating member (plate Member), 30 ... Intermediate rotating member (annular plate member), 32 ... Upper non-rotating member (annular plate member), 36 ... Spool-shaped member, 42 ... Screw supply case member, 46 ... Screw accommodating hole, 62 ... Screw guide tube, 64 ... Screw guide tube 62 tip portion.

Claims (1)

[Scope of utility model registration request] 1. An electrically driven bit stem (16) and an inner pipe member for rotatably housing the bit stem (16).
(22), an outer pipe member (24) slidably and rotatably arranged outside the inner pipe member (22), and detachably attached to the outer pipe member (24). A screw supply case member (42) having a plurality of screw receiving holes (46) in the bit stem (1).
6) is formed parallel to the axis line and at equal intervals around the axis line, and further comprises a screw take-out mechanism attached to the outer pipe member (24) below the screw supply case member (24). Then
This screw take-out mechanism includes an upper non-rotating member (32) which is supported in a non-rotating state with respect to the outer pipe member (24) and a lower side which is supported in a non-rotating state with respect to the outer pipe member (24). Rotating member
(26), the upper non-rotating member (32) and the lower non-rotating member
(26) and an intermediate rotating member (30) that is rotatably supported around the outer pipe member (24),
The upper non-rotating member (32) includes the screw supply case member (2
The lower non-rotating member is formed with a screw accommodating hole portion (48) which can be aligned with one of the screw accommodating holes (46) of (4).
A screw discharge hole is formed in (26), and the intermediate rotating member (30)
A screw take-out hole (50) is formed in the intermediate rotation member (3
0) is a first alignment position where the screw take-out hole (50) is aligned with the screw accommodating hole (48) of the upper non-rotating member (32), and the screw take-out hole (50) is the lower rotating member (50). The screw discharge hole of the screw non-rotating member (26) of the screw take-out mechanism (26, 30, 32) is rotatable between the screw discharge hole of (26) and a second aligned position aligned with the screw discharge hole. A screw guide member (62) extending beyond the bit tip of the bit stem (16), and the screw guide member (62) is curved so that its tip portion is axially aligned with the bit tip, An opening (66) is formed above the tip of the screw guide member (62) so that the bit tip can enter the tip, and the screw supply case member (42) and Screw take-out mechanism (2
6,30,32) and the screw guide member (62) are attached to the axis of the bit stem (16) by the sliding action of the outer pipe member (24) with respect to the inner pipe member (22). And a bit tip in a non-screwed position when the assembly is placed in the lower position, the bit tip being in an unscrewed position. Is located in the upper position, the tip of the bit is in a screw tightening position, and further elastic spring means (70) for elastically biasing the assembly to the lower position; When the screw feeding case member (42) is moved from the lower position to the upper position against the elastic force of the means (70), a screw is inserted from a predetermined screw receiving hole (46) of the screw supply case member (42) into the screw guide member (62). ) The intermediate rotating member
Cam means (82, 92) for rotating the (30) from the first alignment position to the second alignment position, the cam means being formed on the inner pipe member (22). Cam groove (82),
A pin element (92) that engages with the cam groove (82) through the outer tube member (24) from the intermediate rotating member (30),
The cam groove (82) has a spiral shape that causes the intermediate rotating member (30) to perform a rotational movement between the first alignment position and the second alignment position. Electric screwdriver with screw supply function.