JPH06126646A - Screw driving device - Google Patents

Abstract

PURPOSE: To provide a screwdriver driving screws continuously one by one, which has a screw-holding tape feed mechanism capable of feeding the screw- holding tape by one pitch with a very simple mechanism. CONSTITUTION: This screwdriver is constituted of a casing 1 fixed to a driver tool and a sliding member 2 capable of sliding and reciprocating in the casing. A screw-holding tape feed mechanism includes a guiding slot 8 provided in the casing and a double arm lever 9 fixed to the sliding member so as to rotate by means of a pin 11 fitted in the guiding slot. A pawl member 13 fitting into a groove on one side of a tape 7 is fixed to the end part of one arm 9b of the double arm lever rotatably and pressed against the tape by a spring 15. Another pawl member 21 fitted into a groove on the other side of the tape is fixed to the sliding member 2 rotatably and pressed against the tape by a spring 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw driving device attached to a screwdriver tool and adapted to continuously drive screws held in a row on a screw holding tape one by one.

[0002]

2. Description of the Related Art This type of screw driving device has a cylindrical casing attached to the tip of a driver tool, a sliding member fitted in the casing through a return spring so as to reciprocate, and a sliding member. A mechanism provided in the sliding member and feeding the screw holding tape by one pitch corresponding to the screw holding interval. In this screw holding tape feeding mechanism, a pin is provided on one side surface of a sprocket that usually has a large number of protrusions on both side edges of the outer circumference, and the pin is provided on one side surface of a cylindrical casing. It fits into a guide slot that extends obliquely from and parallel to the directional axis.

When the sliding member is pressed against the mating member, the sliding member is pushed into the casing, the pin moves in the guide slot, and the sprocket rotates by one pitch of the tape screw holding interval. A screw holding tape having a groove fitted in the teeth of the sprocket is transported by one pitch. However, after the screw of the screw holding tape is driven into the mating member by the rotating screwdriver bit, the sprocket pin is returned to the straight part of the guide slot by the return spring in the casing, and the inclined part of the guide slot is returned at the end of the return stroke. As it passes through, the sprocket will reverse by one pitch and return. Therefore, various complicated mechanisms have conventionally been used to release the interlock between the sprocket and the guide slot near the end of the return stroke.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a screw driving device having a screw holding tape feeding mechanism capable of feeding the screw holding tape by one pitch with a very simple mechanism.

[0005]

[Means for Solving the Problems]
For this purpose, the screw driving device according to the present invention is provided with a screw holding tape feeding device.
The tilt mechanism and the straight section provided on the casing
Guide slot and a guide slot on the end of one arm.
Has a pin that fits into the slide and can be freely rotated in the sliding member
It has both arm levers pivotally attached to
Guide the screw holding tape of the sliding member to the end of one arm.
A groove or groove on one side of the thread-holding tape that is guided through the passage.
A pawl member engageable with the hole is pivotally attached, and the pawl member is
A spring constantly urges the screw holding tape to
Sometimes inside the sliding member, the side edge on the opposite side of the screw holding tape
Another pawl member engageable with the groove or hole is pivotally mounted and
Always urged towards the screw holding tape
It is characterized by

In the screw driving device according to the present invention, the sliding member can be provided with a screw holding tape pulling back mechanism for pulling back the screw holding tape in a direction opposite to the tape transfer direction. This screw holding tape pullback mechanism
The pawl member pivotally attached to the arm levers and the pawl members of the pawl member of the other pawl member pivotally attached to the slide member on the opposite side about the pawl member and the screw holding tape guide passage. Has projections provided at the tip end of the pawl and an end opposite to the pawl. The projections of the pawls of the two pawls are screwed into the sliding member by engaging the opposed projections. A two-arm lever for pulling back the pawl member is pivotally attached so as to be retracted in a direction away from the groove of the holding tape.
This screw holding tape pullback mechanism is convenient for the reasons described below.

Further, the screw driving device according to the present invention comprises:
A screw holding mechanism can be provided in front of the screw holding tape guide passage of the sliding member. As this screw holding mechanism, a pair of screw guide members are slid in the lateral through hole of the sliding member penetrating in the lateral direction with respect to the screw holding tape transfer direction so as to face each other with respect to the extension line of the axis of the driver bit. The pair of screw guide members are movably arranged and are urged by springs so that the pair of screw guide members always come close to each other. Further, the pair of screw guide members are interlocked with movement of one pitch of the screw holding tape. Means are provided for causing the two to approach each other during screwing and to separate from each other during tape transfer. This screw holding mechanism is very advantageous for the reason described later.

The means for bringing the pair of screw guide members close to each other when driving the screw and separating them from each other when the tape is transferred is interlocked with the movement of one pitch of the screw holding tape. When the grooves that open outward are provided at a constant pitch, each of the screw guide members has a lever pivotally attached at one end, and each lever is extended from the screw holding center of the screw guide member along the transfer direction. The other end rotatably supports the sliding member, and each lever has a tape groove from the screw holding center of the screw guide member so as to be fitted into the groove of the tape when the pair of screw guide members are engaged with each other. It can be advantageously implemented by providing V-shaped projections at positions displaced by half the pitch.

Alternatively, the means for bringing the pair of screw guide members close to each other at the time of screw driving and separating them from each other at the time of tape transfer in cooperation with the movement of one pitch of the above-mentioned screw holding tape is a side edge portion of the tape. In the case where holes are provided at a constant pitch along with, there are guide member holding levers pivotally attached to the screw guide member at one end respectively, and the guide member holding levers are moved from the screw holding center of the screw guide member. Along the direction and pivotally supported by the sliding member at the other end, while engaging at one end of the drive slot provided in each guide member holding lever at one end of the arm and at the other end of the arm. A tape interlocking arm lever is pivotally attached so that it is inserted into a hole of the tape from a direction perpendicular to the surface of the tape, and a pair of screw guide members are engaged with each other at the end of the other arm of the tape interlocking arm lever. Combined Can be advantageously carried out from the screw holding the center of the screw guide member so as to fit into the tape hole into existence at a position shifted by half a pitch of the tape hole when the.

Further, in the screw driving device according to the present invention, the tape holding device can be provided at the rear portion of the side surface of the casing where the sliding member has the screw holding tape inlet.
This tape holding device comprises a mounting base mounted on the rear part of the casing, and a tape holding member pivotally supported on the mounting base by a pivot mounted parallel to the plane of the casing. The guide groove is supported by the pivot so as to incline upward toward the screw holding tape inlet of the sliding member in front of the casing.

[0011]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view of a screw driving device according to the present invention. This screwdriver has a cylindrical casing 1
And a sliding member 2 slidably mounted in the casing 1. In use, the cylindrical part 3 protruding from the rear end of the casing 1 is connected to the driver tool. As shown in FIG. 4, the driver bit 4 at the tip of the driver tool is inserted into the through hole 2c in the sliding member 2. The sliding member 2 is constantly urged forward by the return spring 5.

2 to 4, the screw holding tape feeding mechanism according to the present invention for transferring the screw holding tapes 7 holding the screws 6 in a row at equal intervals in the sliding member 2 by one pitch of the screw holding intervals. I have it.

As the screw holding tape, as shown in FIG. 9, a tape having grooves open outward along its both side edges at a constant pitch and, as shown in FIG. 12, along its both side edges. Both tapes with a constant pitch of holes can be used.

Now, as shown in FIG. 2, the screw holding tape feeding mechanism has a guide slot 8 for a pin, which will be described later, provided on one side wall 1a of the casing 1, and the guide slot 8 has an inclined portion 8a. The straight portion 8b extends in the longitudinal direction of the casing. On the other hand, in the sliding member 2, one arm 9a of the both arm lever 9 is pivotally mounted by a pin 10 on one side with the tape 7 as the center in the plan sectional view of FIG. The cylindrical member 12, which is rotatably fitted around the pin 11 provided at the end of the casing 1,
The guide slot 8 is fitted in the inclined portion 8a. A plate-like pawl member 13 is pivotally attached to the tip of the other arm 9b of the both-arm lever 9 so as to be rotatable around a pin 14, and is biased by a spring 15 toward the screw holding tape 7. As is apparent from FIG. 2, the spring 15 has the pawl member 13
It is hooked at one end to a protrusion 16 on the side wall of the and is hooked at the other end to a protrusion 17 provided on the pawl member 13. Claw member 13
The pawl 13a is constantly urged by the spring 15 and is inserted into the groove 7a provided on one side edge of the screw holding tape 7 at a pitch equal to the screw holding interval. Screw holding tape 7
Is a screw holding tape guide wall 18 which vertically penetrates the inside of the sliding member 2 in the longitudinal direction of the sliding member 2 in FIG.
And a screw holding tape guide member 19 having a U-shaped cross section (FIG. 4) attached to the sliding member 2 so as to face the screw holding tape guide wall 18, and is guided through the guide passage. The cylindrical member 12 at the tip of one arm 9a of the two-arm lever 9 penetrates the arc-shaped slot 20 on the side wall of the sliding member 2 and projects into the guide slot 8 of the casing 1 as shown in FIG. There is.

In the pushing stroke in which the sliding member 2 is pushed into the casing, in FIG. 2, the cylindrical member 12 obliquely moves downwardly on the inclined portion 8a of the guide slot 8 of the casing 1, whereby the two arm levers 9 are moved. One arm 9a rotates about the pin 10 and the other arm 9b rotates upward, and the pawl 13a of the pawl member 13 pushes up the screw holding tape 7 by one pitch of the screw holding interval. At the end of the return stroke, the two arm levers 9 are forcibly returned by the inclined portions 8b of the guide slots of the casing 1, the pawls 13a of the pawl members 13 at this time being the grooves 7a of the screw holding tape.
Is pushed backward from the spring against the spring and returns to the position shown in FIG. In order to hold the screw holding tape 7 so as not to return in the return stroke, the sliding member 2 further faces the pawl member 13 with the screw holding tape 7 as the center, as seen in the plan sectional view of FIG. On the side to be attached, another T-shaped pawl member 21
(Dashed line in FIG. 2) is pivotally attached by a pin 22. This pawl member 21 is always screw-held by a torsion spring 24 which is in contact with the inner wall of the sliding member 2 at one end and is in contact with a projection 23 provided at the other end on the horizontal portion of the lower end of the pawl member 21 at the other end. By being biased toward the tape 7, the pawl 21a at the tip end engages with the groove 7b at the other side edge of the screw holding tape 7.

Further, according to the present invention, the sliding member 2 is provided with a tape pullback mechanism for freely pulling back the screw holding tape 7 in the direction opposite to the tape transfer direction A (FIG. 2).
This pull-back mechanism is provided by the pawl 2 of another T-shaped pawl member 21.
In addition to the above-mentioned projection 23 provided at the end opposite to 1a, a projection 25 projecting inward is also provided at the end opposite to the pawl 13a of the pawl member 13 so as to face the projection 23, and slides one way. Another arm lever 26 is pivotally mounted inside the member 2 so as to be pivotable around a pin 27, an arm 26a at one end of the arm lever 26 is extended to the opening 2a on the upper surface of the sliding member 2, and The other arm 26b extends so as to be located on the side of the pawls 13a and 21a at a distance from the projections 15 and 23 of both pawl members 13 and 21, and the other end is always provided by the torsion spring 28 wound around the pin 27. The arm 26b is urged to come into contact with the back surface of the tape guide member 19. With the structure of this pawl pulling-back mechanism, when the tip of one arm 26a of both arm levers 26 existing in the opening 2a is pushed forward, the other arm 26b moves backward around the pin 27 as shown in FIG. By pivoting to push the projections 23 and 25 of both pawl members 13 and 21 rearward, the pawls 13a and 21a separate from the grooves 7a and 7b at the both side edges of the screw holding tape 7, respectively. Therefore, the screw holding tape 7 can be pulled back freely. As a result, it is possible to replace the screw during the screw driving, and it is also possible to return the screw that has been mistakenly fed to the driven state.

Further, according to the present invention, a screw guide mechanism is provided in front of the tape guide passages 19 and 22 of the sliding member 2. 5 to 8, this screw guide mechanism has a pair of screw guide members 30, 30 'in the lateral through hole 2b of the sliding member 2 penetrating in the lateral direction with respect to the tape transfer direction A.
The pair of screw guide members 30, 30 'are opposed to the extension of the driver bit axis B (FIG. 4) in the lateral through hole 2b, that is, the threaded portion of the screw 6 held by the screw holding tape 7 from both sides. And it is slidably fitted. The pair of screw guide members 30, 30 'have recesses 31, 31' at their front ends, each having a depth corresponding to the radius of the screw portion to be guided.
And has recesses 32, 32 'forming a semi-cylindrical portion having a larger radius at the rear ends of the screw guide members 30, 30' so that a screw can be easily inserted therein.

Further, in this screw guide mechanism, a pair of screws are provided so as to interlock with the transfer of the screw holding tape 7 to bring the screw guide members 30, 30 'close to each other when the screw is driven in and to separate them when the tape is transferred. The embodiment of the screw guide mechanism shown in FIGS. 5 to 8 is applied when the tape 7 has grooves 7a and 7b which open outward along both side edges thereof at a constant pitch as shown in FIG. Guide members 30, 30 '
Has tape interlocking levers 33, 33 'of U-shaped cross-section pivotally attached at one end by pins 30a, 30a' respectively. As shown in FIG. 8, each tape interlocking lever is shown in FIG. The pins 34, 3 extend from CC along the transfer direction A and are inserted into the recesses of the sliding member 2 at the other end.
4 ', and a tape interlocking lever 33, 33', and thus a pair of screw guide members 30, 30 'pivotally attached thereto.
Is constantly urged toward the thread portion of the screw 6 of the tape 7 by the respective torsion springs 35 and 35 '.

Further, the tape interlocking levers 33, 3
In the middle of 3 ', there are V-shaped projections 36, 36', which are grooves on both side edges of the screw holding tape 7 when the pair of screw guide members 30, 30 'are engaged with each other. So as to fit in the tape transfer direction A at a position displaced from the screw holding central axis C-C of the screw guide members 30 and 30 'by half a pitch of the tape groove. In practice, the V-shaped projections 36, 36 'are formed at the tip of the projections protruding from one side plate of the lever 33, 33' to the tape, as is apparent from FIG.

The sliding member 2 is pushed into the casing 1 and the tape 7 is transferred one pitch by the inclined portion 8a of the guide slot 8 of the casing 1, and the screw held by the tape is on the same axis B as the driver bit 4. When (Fig. 4,
7 and 8), the V-shaped projections 36, 36 'of the tape interlocking levers 33, 33' are engaged by the springs 35, 35 'with the grooves 7a, 7b on both side edges of the tape 7 and the screw guide member 30,
As 30 'engages with each other, long screws can be retained, such as the phantom lines in FIG. However, in the process in which the tape 7 is transferred by one pitch of the screw holding interval, the V-shaped protrusion 3 is moved from the grooves 7a and 7b on both side edges of the moving tape 7 as shown in FIG.
6, 36 ′ is pushed outward by sliding on the outer edge of the tape, so that the screw held by the tape can easily pass between the two extended screw guide members 30, 30 ′.

The above embodiment of the screw guide mechanism has been described for the case where the tape has grooves 7a and 7b which open outward at a constant pitch along both side edges thereof as shown in FIG. As shown in FIG. 10, an embodiment of the screw guide mechanism will be described with reference to FIGS. 10 to 14 in the case of the tape 7'having holes at a constant pitch along both side edges thereof.

In this case, the means for bringing the pair of screw guide members 130 and 130 'close to each other when driving the screw and separating them when the tape is transferred is interlocked with the transfer of the screw holding tape 7'. ′ Has U-shaped screw guide member holding levers 133 and 133 ′ pivotally mounted so as to sandwich each screw guide member at one end, and these screw guide member holding levers are screw-guided as shown in FIG. Member 13
It extends from the screw holding central axis C-C of 0, 130 'along the tape transfer direction A, and is pivotally attached to the recess of the sliding member 2 at the other end by pins 134, 134'. Furthermore, on the outside of both side edges of the tape, the tape interlocking arm levers 138
, 138 'are pivotally attached by pins 139, 139', one end of one arm 138a, 138a 'of each tape-interlocking arm lever is extended so that it can be inserted and removed in a direction perpendicular to the plane of the tape, and the other end. The ends of the arms 138b, 138b 'are fitted into drive slots 140, 140' (FIG. 12) provided on one side surface of the screw guide member holding levers 133, 133 '. The ends of the arms 138a and 138a 'of each tape-interlocking both-arm lever are V-shaped (see FIG.
0) and a pair of screw guide members 130, 13
When the 0'is engaged, the screw guide members 130, 130 'are displaced from each other by a half pitch of the tape hole so as to be vertically inserted into the tape holes 7a, 7b'. Existing.

When the screw is driven, the screw guide member 130,
As shown in FIGS. 11 and 12, 130 'are engaged with each other, and the tips of the arms 138a, 138a' of the two levers for interlocking with the tape are fitted in the holes on both side edges of the tape. While the tape is being conveyed by one pitch, as shown in FIG. 13, one arm 138a of the tape interlocking arm levers 138, 138 ',
The V-shaped tip of 138a 'is released from the tape hole and slips on the tape, and therefore the tape-interlocking two-arm levers 138, 138'.
Respectively pivot outwards and the screw guide members 130, 130 'open outwards.

In the case of this embodiment, since there is no groove that opens outward on both side edges of the tape, it is advantageous in that there is no risk of the tape getting caught when passing through the tape guide passage or the tape holding device described later.

According to this screw guide mechanism, in the conventional screw driving device, a long screw as shown by an imaginary line in FIG. 6 or FIG. However, when the screw is driven, the recesses 31 and 31 'at the front end of the screw guide member can hold the axial center of the screw so that it is not laterally offset, so that the screw can be accurately driven to a predetermined position despite the long screw. At the same time, in the case of a short screw as shown by the solid line in FIG. 6 or FIG. 11, even if there is no guide, there is no lateral deviation, so that it can be used as usual.

Further, according to the present invention, a tape holding device is provided at the rear portion of the side surface of the tape inlet of the casing 1. Figure 2
15 and 15, the tape holding device includes a mounting base 40 mounted on the rear portion of the casing 1, and a mounting base 40.
And a tape holding member 42 rotatably supported by a pivot 41 parallel to the plane of the casing 1. The tape holding member 42 has a guide groove 43 for holding the tape, and this guide groove 43 goes upward toward the tape inlet side of the sliding member 2 in front of the casing 1 as is apparent from FIG. It is supported by the pivot 41 by a long leg portion 44 and a short leg portion 45 so as to be inclined.

For comparison, a conventional tape holding device is shown in FIG.
6 shows. In this tape holding device, the tape holding member 5
2 is likewise supported obliquely on the mount 50, but the pivot 51 is not parallel to the plane of the casing but parallel to the oblique tape holding member 52. For this reason, the turning radius of the tape holding member 52 is the same at the front end and the rear end thereof, and therefore the guide groove draws the same arc locus during turning. In this case, the guide range of the tape is narrow, and the tape having the groove on the side edge in the longitudinal direction may be caught in the guide groove, so that the guide cannot be performed smoothly.

On the other hand, in the tape holding device of the present invention, the tape holding member 42 is supported by the short leg portion 45 at the front end and the long leg portion 44 at the rear end, and the turning radii are different, so that the guide is provided during turning. Since the front end of the groove 43 draws a locus of a small arc and the rear end draws a locus of a larger arc, the swivel angle range for guiding the tape is widened and the tape can be smoothly fed.

Next, the operation of the screw driving device of the present invention will be briefly described. When the tip end surface of the sliding member 2 is pressed against the member into which the screw is driven, the both arm levers 9 are swung clockwise in FIG. 2 by the inclined portion 8a of the guide slot 8 of the casing 1 as described above, and the tape The pawl 13a of the pawl member 13 of the other arm 9b, which engages with the groove 7a or the hole 7a 'of one side edge, transfers the tape 7 in one pitch A direction, and the pawl 21a of the other pawl member 21 is The tape is pushed out of the groove 7b or the hole 7b 'on the opposite side edge of the tape against the spring 24, slides on the tape 7, and after one pitch transfer of the tape, enters the next groove of the tape again. Furthermore, the sliding member 2
Is pushed along the straight line portion 8b of the guide slot 8, the tip of the driver bit 4 is pushed through the through hole 2 of the sliding member 2.
The screw 6 can be driven through a screwdriver bit 4 that is driven through a screwdriver 6 to be rotated through a screwdriver tool tool 4 through c (FIG. 4). In the return stroke, the return spring 5
Thus, when the cylindrical member 12 of the both-arm lever 9 passes through the straight portion 8b and then enters the inclined portion 8a, the both-arm lever 9 starts rotating counterclockwise in FIG. 2 and finally reaches the position in FIG. Stop. During this time, the pawl 13a of the pawl member 13 at the tip of the both-arm lever 9 is separated from the groove 7a or the hole 7a 'of the tape against the force of the spring 15, slides on the tape, and the tape is again moved to the position shown in FIG. Next groove 7a or hole 7
engage a '. During this return stroke, the pawl 21a of the pawl member 21 on the other side remains engaged by the spring 24 with the groove 7b or hole 7b 'on the other side edge of the tape.
The tape retains its position without returning.

[0030]

According to the structure of the screw holding tape feeding mechanism of the first aspect, the structure is much simpler than the conventional one and can be manufactured at a low cost.

According to the tape pullback mechanism of the second aspect, the tape can be freely pulled back by operating the lever, so that the tape can be replaced with a screw holding tape having a different screw during work.

According to the structure of the screw guide mechanism of claim 3,
Not only short screws but also long screws, which cannot be used in the conventional screw driving device, can be held so that the screw shaft center does not deviate, so that the screw can be accurately driven into a predetermined position.

According to the structure of the screw holding mechanism of claim 6,
The turning angle range for guiding the tape is wider than that of the conventional one, and the tape can be fed smoothly.

[Brief description of drawings]

FIG. 1 is a perspective view of a screw driving device according to the present invention.

FIG. 2 is a side view showing the screw driving device according to the present invention partially broken away.

FIG. 3 is a view similar to FIG. 2, but showing a partial cross-sectional view showing a state where the tape pullback mechanism is operated.

4 is a vertical cross-sectional view taken along line IV-IV in FIG.

FIG. 5 is a partial side view of a sliding member having a first embodiment of the screw guide mechanism according to the present invention.

6 is a cross-sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG.
It is a figure which shows the state which the screw guide members mutually separated during tape transfer.

8 is a cross-sectional view taken along line VII-VII of FIG. 5, but showing a state in which the screw guide member holds the screw after the tape has been transferred by one pitch.

FIG. 9 is a partial plan view showing an example of a screw holding tape having grooves that open outward on both side edges.

FIG. 10 is a partial side view of a sliding member provided with a second embodiment of the screw guide mechanism according to the present invention.

11 is a partial cross-sectional view taken along the line XI-XI of FIG. 10, showing the screw guide members engaged with each other and closed;

12 is a partial cross-sectional view taken along the line XII-XII in FIG. 11, similarly showing a state in which the screw guide member is closed.

FIG. 13 is a partial cross-sectional view similar to FIG. 11, but showing the screw guide member in an open state.

14 is a partial cross-sectional view taken along the line XIV-XIV of FIG.

FIG. 15 is a perspective view showing a tape holding device according to the present invention.

FIG. 16 is a side view of a conventional tape holding device.

[Explanation of symbols]

 1 casing 2 sliding member 2b lateral through hole 4 driver bit 5 return spring 6 screw 7 screw holding tape 7a groove on one side edge of tape 7b groove on the other side edge of tape 8 guide slot 8a inclined portion 8b straight portion 9 Both arm levers 9a One arm 9b The other arm 13 Pawl member 15 Spring 18, 19 Screw holding tape guide passage 21 Another pawl member 23 Protrusion 24 Spring 25 Protrusion 26 Pawl member Pull back both arm levers 30, 30 '; 130, 130 'Screw guide member 33, 33' Tape interlocking lever 35, 35 '; 135, 135' Spring 36, 36 '; 138a, 138a' V-shaped protrusion 40 Mounting base 41 Axis 42 Tape holding member 43 Guide groove 133, 133 ' Guide member holding lever 138, 138 'Tape-interlocking both-arm lever 140, 140' Drive slot To B driver bit axis

Claims (6)

[Claims] 1. A screw driving device which is attached to a driver tool so as to continuously drive screws held in a row on a screw holding tape one by one, the screw driving device being attached to a tip portion of the driver tool. A tubular casing, a sliding member that fits in the casing in a slidable and reciprocating manner via a return spring, and a mechanism that is provided in the sliding member and that feeds the screw holding tape by one pitch at a screw holding interval. In the screw driving device having, the screw holding tape feeding mechanism has a guide slot formed of a slanted portion and a straight portion provided in the casing, and a pin fitted in the guide slot at an end of one arm. And a two-arm lever pivotally mounted in the sliding member so that the other arm end of the two-arm lever is guided in a screw holding tape guide passage that crosses the sliding member. A pawl member engageable with a groove or hole on one side edge of the tape holding tape is pivotally attached to the pawl member, and the pawl member is constantly urged by a spring toward the screw holding tape. A screw driving device, characterized in that another pawl member engageable with a groove or hole on the opposite side edge of the tape is pivotally mounted and constantly biased by a spring towards the screw retaining tape. 2. The sliding member is provided with a screw holding tape pulling back mechanism for pulling back the screw holding tape in a direction opposite to the tape transfer direction, and the screw holding tape pulling back mechanism is pivotally attached to the both arm levers. The pawl member and the pawl tips of the pawl members of the other pawl member pivotally attached to the slide member on opposite sides about the pawl member and the screw holding tape guide passage. Each of them has a protrusion projecting toward each other, and further, in the sliding member, engages with the opposed protrusions so that the pawls of the both pawl members are separated from the groove of the screw holding tape. 2. The screw driving device according to claim 1, further comprising pivotally mounted two-arm levers for retracting the pawl member for retracting. 3. A screw holding mechanism is provided in front of the screw holding tape guide passage of the sliding member, and as the screw holding mechanism, a horizontal penetrating of the sliding member penetrating laterally with respect to the screw holding tape transfer direction. Inside the hole, a pair of screw guide members are slidably arranged opposite to each other with respect to the extension line of the axis of the driver bit, and the pair of screw guide members are always close to each other by springs. And a means for bringing the pair of screw guide members closer to each other when driving the screw and separating them from each other when the tape is transferred, in association with the movement of one pitch of the screw holding tape. The screw driving device according to claim 1. 4. A means for bringing a pair of screw guide members close to each other when driving a screw and separating them from each other when a tape is transferred is interlocked with movement of one pitch of the screw holding tape. When the grooves that open outward along a certain pitch are provided, each of the screw guide members has a tape interlocking lever pivotally attached at one end, and each tape interlocking lever is located from a screw holding center of the screw guide member. A screw guide member that extends along the transfer direction and is rotatably supported by a slide member at the other end so that each tape interlocking lever is fitted into the groove of the tape when a pair of screw guide members are engaged with each other. 4. The screw driving device according to claim 3, wherein a V-shaped protrusion is provided at a position displaced from the screw holding center of 1 by one half pitch of the tape groove. 5. A means for bringing a pair of screw guide members close to each other when driving a screw and separating them from each other when a tape is transferred is interlocked with movement of one pitch of the screw holding tape. Along with the holes at a constant pitch, each of the screw guide members has a guide member holding lever pivotally attached at one end, and each guide member holding lever is moved from the screw holding center of the screw guide member in the transfer direction. Along the other side of the tape is pivotally supported by the sliding member, and the outer side edges of the tape are engaged with the drive slots provided in the guide member holding levers at the ends of one arm. The tape-interlocking both-arm lever is pivotally attached so that it can be inserted into and removed from the tape hole at the end of the other arm in a direction perpendicular to the tape surface. Department is 4. The screw guide member is located at a position displaced by a half pitch of the tape hole from the screw holding center of the screw guide member so that the screw guide member is fitted into the tape hole when the pair of screw guide members are engaged with each other. Screw driving device. 6. A screw holding tape holding device is provided at a rear portion of a side surface of the casing where the sliding member is provided with a screw holding tape inlet, and the screw holding tape holding device is attached to a rear portion of the casing. And a tape holding member pivotally supported by a pivot mounted on the mounting base in parallel with the plane of the casing, the guide groove of the tape holding member holding a screw of a sliding member in front of the casing. 2. The screw driving device according to claim 1, wherein the screw driving device is supported on the pivot so as to be inclined obliquely upward toward the tape insertion port.