JPH07115306B2 - Screw driving device - Google Patents

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 in a screw holding tape one by one, and more particularly to a sliding device. The present invention relates to a screw holding mechanism provided in front of a screw holding tape guide member of a member.

[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. And a feed 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, in the conventional screw driving device,
Since the gap between the tip surface of the sliding member and the tape guide passage is fixed, a long screw exceeding the gap cannot be driven. Further, even when the distance between the tip end surface of the sliding member and the tape guide passage is long, the shaft center of the long screw is laterally offset and cannot be accurately driven into a predetermined position.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screw driving device provided with a screw holding mechanism capable of driving a relatively long screw in a stable and accurate position. .

[0006]

In order to achieve the above object, a screw driving device according to the present invention has a screw holding mechanism in front of a 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.

The means for bringing the pair of screw guide members into close proximity 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 conjunction with the movement of one pitch of the above-mentioned screw holding tape, is 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.

[0009]

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 sliding member 2 is provided with a screw holding tape feeding mechanism for moving the screw holding tapes 7 holding the screws 6 in a row at equal intervals by one pitch. .

As the screw holding tape, as shown in FIG. 9, a tape having grooves open outward along both side edges thereof at a constant pitch, and as shown in FIG. 12, along both side edges thereof. 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 levers 9 of the two arms 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.

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. Figure 5
8, the 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. A pair of screw guide members 3
Nos. 0 and 30 'have recesses 31 and 31' having a depth corresponding to the radius of the threaded portion to be guided, respectively, at their front ends, and screws are inserted into the rear end portions of the screw guide members 30 and 30 '. For convenience, it has recesses 32, 32 'which form a semi-cylindrical portion of larger radius.

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 and 30 'close to each other when driving the screw 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 the grooves 7a and 7b which open outward at a constant pitch along both side edges 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, 130 'close to each other when driving the screw and separating the tape guide member 130, 130' in conjunction with the transfer of the screw holding tape 7'is a pair of screw guide members 130, 130. ′ Has U-shaped screw guide member holding levers 133 and 133 ′ pivotally attached so as to sandwich each screw guide member at one end, and these screw guide member holding levers are screwed as shown in FIG. The members 130 and 130 'extend from the screw holding central axis C-C along the tape transfer direction A, and are pivotally attached to the recesses of the sliding member 2 at the other ends by pins 134 and 134'.
Further, the tape interlocking arm levers 138 and 138 'are provided on the outer sides of both side edges of the tape, respectively.
9 ', and the ends of one arm 138a, 138a' of each tape interlocking arm lever are extended so that they can be inserted and removed in a direction perpendicular to the surface of the tape, and the other arm 138b, 138b 'is extended. The ends 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, 138a 'of the two levers for interlocking each tape are
When formed into a V shape (dotted line in FIG. 10) and engaged with the pair of screw guide members 130, 130 ', the tape hole 7a,
7b 'so as to fit vertically into the screw guide members 130, 1
It is located at a position displaced from the screw holding central axis C-C of 30 'by half a pitch of the tape hole.

At the time of screw driving, the screw guide member 13
0 and 130 'are engaged with each other as shown in FIGS. 11 and 12, and one arm 138 of the tape-interlocking both-arm lever.
The tips of a and 138a 'are fitted in the holes on both side edges of the tape. While the tape is being transported one pitch,
As shown in FIG. 13, the tape-interlocking both-arm levers 138, 13
The V-shaped tip of one arm 138a, 138a 'of the 8'is released from the hole of the tape and slips on the tape. Therefore, the tape-interlocking both-arm levers 138, 138' pivot outwards respectively and the screw guide member is moved. 130 and 130 'open outward.

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, even a long screw as shown by a phantom line in FIG. 6, which cannot be used due to a short distance between the tip surface of the sliding member and the tape, can be used. A recess 31 at the front end of the screw guide member when driving,
Since the screw shaft 31 'can be held so that the axial center of the screw is not laterally offset, the screw can be accurately driven into a predetermined position in spite of a 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.

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 two arm levers 9 pivot 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.
It is possible to drive the screw 6 by means of a driver hit 4 which comes out of c (FIG. 4) and engages with the head of the screw 6 and is rotationally driven by a driver tool. 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.

[0024]

As described above, according to the structure of the screw guide mechanism of the present invention, not only short screws but also long screws that cannot be used in the conventional screw driving device are held so that the screw shaft center is not offset. Since it is possible, it is possible to drive accurately at a predetermined position.

[0025]

[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.

7 is a cross-sectional view taken along line VII-VII of FIG. 5, showing a state in which the screw guide members are separated from each other during the tape transfer.

8 is a cross-sectional view taken along line VII-VII of FIG. 5, 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 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 line XIV-XIV of FIG.

[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 lever 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 133, 133 'Guide member holding lever 138, 138' Tape interlocking arm Lever 140,140 'Drive slot B Driver bit axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-166066 (JP, A) JP-A-2-124275 (JP, A) Actual development Sho-54-102780 (JP, U) JP-B-58- 34263 (JP, B2)

Claims (3)

[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 cylindrical casing, a sliding member that slidably and reciprocally fits inside the casing via a return spring, and a screw holding tape that is guided in a screw holding tape guide passage that traverses the sliding member are provided at screw holding intervals. In a screw driving device having a mechanism for feeding by one pitch, a screw holding mechanism is provided in front of the screw holding tape guide passage of the sliding member, and the screw holding mechanism is a lateral direction with respect to the screw holding tape transfer direction. A pair of screw guide members are slidably arranged in the lateral through hole of the sliding member penetrating to the opposite side so as to be opposed to the extension line of the axis of the driver bit from both sides. The members are urged by a spring so that the pair of screw guide members always come close to each other, and further, the pair of screw guide members are made to come close to each other when the screw is driven in conjunction with the movement of one pitch of the screw holding tape. A screw driving device comprising means for separating the tape from each other when the tape is transferred. 2. 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. 2. The screw driving device according to claim 1, wherein a V-shaped protrusion is provided at a position shifted from the screw holding center of the tape by half a pitch of the tape groove. 3. A means for bringing a pair of screw guide members closer to each other when driving a screw and separating them from each other when a tape is transferred is interlocked with the 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 2. A pair of screw guide members are located at a position displaced from the screw holding center of the screw guide member by a half of one pitch of the tape holes so that they are fitted into the holes of the tape when they are engaged with each other. Screw driving device.