JP6075164B2 - Screw guide structure in screw tightening machine for connecting screw - Google Patents

Description

  The present invention relates to a guide structure for guiding a screw vertically in a screw tightening machine having a screw feeding mechanism that sequentially feeds connection screws in which a plurality of screws are connected by a connection band to a driving position.

  As a screw tightening machine for connecting screws, the one that presses the nose part against the material to be driven and the nose part is pushed in, and the connecting screw feeding operation and the connecting screw driving operation are performed in conjunction with this operation. ing. As such a screw tightening machine for connecting screws, for example, Patent Document 1 discloses an invention of a screw feeding device of a continuous screw tightening machine provided with a screw fall prevention mechanism for preventing a screw fall. This screw fall prevention mechanism is configured to have a pair of tilt members, and by passing through a hole formed between the pair of tilt members, the screw is guided vertically to the driving member to prevent the fall. .

JP 2008-119789 A

  By the way, in such a screw tightening machine for connecting screws, if it is used to press the nose part against the material to be driven so as to strike, the speed of pressing the machine becomes faster and the speed of screw feeding becomes faster. The connected connecting screw may go past a predetermined position due to inertia, resulting in a failure of the connecting screw feeding operation. If the driving operation is performed in this state, the driver bit shaft and screw shaft will be misaligned, so the screw may be driven diagonally or the tip of the driver bit may not catch the screw hole and the screw will fly. Will occur.

  Although Patent Document 1 discloses a screw feeding device for a continuous screw tightening machine provided with a screw fall prevention mechanism, this configuration cannot solve the above-described problem. That is, since the structure of Patent Document 1 does not guide the posture of the screw before driving in, it is inevitable that the connecting screw is sent too much. In addition, when the screw that has been sent is inclined, if the driving operation is performed as it is, the screw thrusts into one of the tilting members, not between the pair of tilting members, and the holes formed between the tilting members Problems such as being driven obliquely without being guided in posture or coming out of the cam are generated.

  Further, in the case of the screw fall prevention mechanism as described in Patent Document 1, since it is necessary to provide hinges on both sides, the screw fall prevention mechanism has a box shape. However, in the case of the box-shaped screw fall prevention mechanism, there are problems that it is difficult to confirm the driving position and that the screw removal work when the screw is clogged is complicated.

  Therefore, the present invention can avoid the problem that the connecting screw is excessively sent by the inertia and can guide the screw vertically, and the screwing machine for the connecting screw can be easily removed when the screw is clogged. It is an object to provide a guide structure in a screw feed mechanism.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.
That is, the screw guide structure in the screw tightening machine for the connection screw according to claim 1 is a guide structure in the screw feed mechanism of the screw tightening machine for the connection screw that sequentially sends the connection screws in which a plurality of screws are connected by the connection band to the driving position. The base part, a nose member slidably provided at the tip of the base part, and a retreat supported by the nose member for vertically guiding a leading screw fed by the screw feeding mechanism comprises a vertical guide member that is, the said vertical guide member Rutotomoni comprises a generally U-shaped guide groove for guiding the vicinity of the tip of the screw, the feed direction of the screw to be sent by the screw feed mechanism, and driving of the screw Is pivotally supported in a cantilevered manner by a swinging shaft arranged in a direction perpendicular to the direction, and a screw is driven and guided to the tip side of the guide groove. The exit opening formed, the when the first screw is fed by a screw feed mechanism, together with the shaft portion of the top screw is fitted into the guide groove, the guide groove to be implanted is top screws fitted the top The vertical guide member is retracted when the head of the screw passes.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above .

Ie, characterized by the inner portion of the guide groove is inclined in a tapered shape.

(Claim 3 )
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2 .
That is, the vertical guide member is pivotally supported by a pair of oscillating shafts arranged coaxially so that a screw can pass between the pair of oscillating shafts.

  The invention according to claim 1 is as described above, wherein the vertical guide member has a substantially U-shaped guide groove for guiding the shaft portion of the screw, and when the leading screw is fed by the screw feeding mechanism, the leading screw Is inserted into the guide groove, and the vertical guide member is retracted when the head screw inserted into the guide groove is driven and the head of the head screw passes. That is, the sent screw is received by the substantially U-shaped guide groove to guide the screw posture, so that the screw posture before driving can be guided. For this reason, since the screw is already vertically guided before driving, it is possible to prevent the connecting screw from being excessively fed by the inertia and to guide the screw vertically. Since the screw continues to be guided vertically during the driving operation, good verticality can be maintained until the end. When the head of the screw passes, the vertical guide member swings in the retracting direction, so that the head of the screw can be passed without any problem.

  Further, since the posture of the screw is guided by the cantilever-shaped vertical guide member, the guide portion does not need to be box-shaped. For this reason, when removing the connecting screw in use to replace the screw to be used, the connecting screw can be pulled out smoothly, the inside of the mechanism is easy to see, and the hand is also easy to put inside, The screw removal work when the screw is clogged is easy. Further, since the guide portion is not box-shaped, the machine tip can be made small, and a machine that is easy to aim at the time of screw construction can be obtained.

In the configuration described in Patent Document 1 described above, the screw is guided by the hole formed by the pair of tilting members. Therefore, the shaft portion of the sent screw cannot be guided as it is, and is driven by a driving operation. The screw must be arranged so that the tip of the screw is inserted into the hole formed by the pair of tilting members, and a certain interval must be provided between the tilting member and the screw in the screw driving direction. For this reason, the length for providing a tilting member in the tip of a screw is needed, and a nose part will become long. In this regard, according to the present invention, since the shaft portion of the screw can be received by the vertical guide member, a length for providing the vertical guide member at the tip of the screw is not necessary. Thus, the nose portion can be shortened and the overall length of the machine can be shortened.
In addition, since the structure is simple, the member can be manufactured at low cost by pressing or the like.

Further, since the guide member for guiding the orientation of the screws that have been sent to place the pivot shaft in a direction perpendicular to the feed direction of the screw, and at the same time can be held sent screw securely, the head of the screw Since the vertical guide member can swing in the retracting direction when passing, the head portion of the screw can be passed without any problem.

Also, the invention according to claim 2 is as described above, and since the inner part of the guide groove is inclined in a tapered shape, the connecting screw is lifted by lifting the connecting band when replacing the screw to be used. When the screw is removed from the screw, the tip of the screw pushes the tapered portion to swing the vertical guide, so that the connecting screw can be easily removed.

The invention according to claim 3 is as described above, and the vertical guide member is pivotally supported by a pair of swinging shafts arranged coaxially so that a screw head is interposed between the pair of swinging shafts. The part can pass through, the rotating arc of the vertical guide member can be reduced, and the overall length of the machine can be shortened.

It is an external appearance perspective view of the screw tightening machine for a connection screw. It is a side view of the screw tightening machine for a connection screw. It is explanatory drawing which shows the internal structure of a fastener supply apparatus. It is an external appearance perspective view of a tip arm. It is an exploded perspective view of a tip arm. It is (a) top view, (b) side view, (c) AA sectional view of a tip arm. It is (a) top view, (b) front view, (c) side view, (d) rear view, and (e) bottom view of a vertical guide member. It is a figure which shows the relationship between the screw at the time of sending operation | movement, and a vertical guide member. It is a figure which shows the relationship between the screw and the vertical guide member at the time of screw head passage. It is a figure which shows the relationship between the screw at the time of removing a screw from a screwing machine, and a vertical guide member. It is a figure for demonstrating the optimal position of the shaft hole of a vertical guide member.

Embodiments of the present invention will be described with reference to the drawings.
The screw tightening machine 10 for a connection screw according to the present embodiment uses a connection screw 50 in which a plurality of screws 51 are connected by a connection band 52. As shown in FIGS. The supply device 20 is mounted.

  Although not shown in particular, the tool body 11 includes a bit mounting portion at a tip portion covered with the fastener supply device 20, and a driver bit is mounted on the bit mounting portion. When the trigger 13 of the tool body 11 is pulled, a motor (not shown) rotates using the battery 14 as a power source. When a nose member 30 (described later) is pressed against the material to be driven while the motor is rotating, the nose member 30 is pushed, the driver bit strikes the screw 51 held by the nose member 30, and the driver bit is pushed. Since the rotation of the motor is transmitted to the pushed driver bit, the driver bit rotates and the screw 51 is tightened to be driven into the driven material.

  The fastener supply device 20 includes a screw feeding mechanism that sequentially feeds the connecting screws 50 to the driving position. As shown in FIG. 3 and the like, the base portion 21 fixed to the tip of the tool body 11 and the base portion 21. A nose member 30 slidably provided at the tip of the base member 21, and a spring 40 that biases the nose member 30 in the protruding direction with respect to the base portion 21.

  The base part 21 is a part attached to the tip of the tool body 11. As shown in FIG. 3, the base portion 21 is connected to a rectangular tubular base casing 22, a plate-shaped guide member 24 fixed to the inner side of the base casing 22, and a lower portion of the base casing 22. And a magazine 23 for guiding the screw 50.

  On the other hand, as shown in FIG. 3, the nose member 30 includes a base portion 31 that can slide along the inside of the base casing 22, and a tip arm 32 that is formed to protrude in the tip direction of the base portion 31.

  As shown in FIGS. 1 and 3, a holding groove 31 a that communicates vertically is formed at the tip of the base 31. The holding groove 31a is for passing the connection band 52 of the connection screw 50, and the connection band 52 of the connection screw 50 sent when the connection screw 50 is sent is introduced from the lower opening of the holding groove 31a. It is formed so as to escape from the upper opening. In addition, slits 31b are formed in front and rear of the holding groove 31a, and a driver bit enters the holding groove 31a from the rear slit 31b to push out the screw 51 held in the holding groove 31a and pushed out. The screw 51 is driven out from the front slit 31b.

  The distal arm 32 is a substantially L-shaped member in plan view fixed to the distal end of the base 31, and includes a contact portion 32a at the distal end. The contact portion 32a is a portion that comes into contact with the workpiece when the nose member 30 is pressed against the workpiece. In the contact portion 32a according to the present embodiment, a shape for receiving the tip of the screw 51 sent by the screw feeding mechanism is formed, and an injection port 32b for driving and guiding the screw 51 is formed.

  When the screw 51 is driven by the connecting screw tightening machine 10 according to the present embodiment, the nose member 30 (contact portion 32a) is pressed against the driven material while the trigger 13 is pulled. By this operation, the nose member 30 is pushed into the base portion 21, and in conjunction with this operation, a feeding operation of the connecting screw 50 and a driving operation of the connecting screw 50 are executed.

  The feeding operation of the screw 51 is executed by a screw feeding mechanism as shown in FIG. As shown in FIG. 3, the screw feed mechanism includes a wheel member 33 rotatably supported by a base 31, a one-way clutch mechanism (not shown) for transmitting rotational force to the wheel member 33, and a one-way clutch mechanism. The roller arm 37 is connected to the roller arm 37, and the roller 38 is rotatably supported at the tip of the roller arm 37.

  Among these members, the wheel member 33 is a pair of members that are rotatably supported inside the nose member 30. On the outer peripheral edge of the wheel member 33, teeth that engage with the notches 52a of the connection band 52 of the connection screw 50 are formed at equal intervals with the notches 52a. As shown in FIG. 3, the wheel member 33 is disposed at a position where it engages with the notch 52a, and is formed so as to feed the connecting screw 50 upward by rotating in the feeding direction (clockwise in FIG. 5). Has been.

  The one-way clutch is a mechanism provided to rotate the wheel member 33 only in the feed direction. When the roller arm 37 moves in the feed direction, this force is transmitted to the wheel member 33, and when the roller arm 37 moves in the counter feed direction, this force is not transmitted to the wheel member 33.

  The roller 38 is guided to move by the guide member 24 described above when the nose member 30 is pushed and slid. That is, as shown in FIG. 3, the guide member 24 is provided with a guide portion 24a that is a groove penetrating and formed in substantially the same width as the roller 38, and the roller 38 is guided to move along the guide portion 24a. It is formed so that. Since the guide portion 24a is inclined obliquely with respect to the pushing direction of the nose member 30, the roller arm 37 swings when the roller 38 moves along the guide portion 24a. The roller arm 37 swings to generate a rotational force, and the screw feeding operation is executed using this rotational force. Specifically, when the nose member 30 is pushed in, the roller arm 37 swings in the feed direction, so that the generated rotational force is transmitted to the wheel member 33 by the one-way clutch. As a result, the wheel member 33 rotates in the feeding direction and feeds the connecting screws 50 one by one.

  Then, when the driving operation is completed and the nose member 30 is separated from the driven material, the nose member 30 returns to the standby position by the urging force of the spring 40. In conjunction with this, the roller 38 returns to the position before the feeding operation along the guide portion 24a of the guide portion 24a. At this time, the roller arm 37 swings, but this operation is not transmitted by the action of the one-way clutch, and the rotation of the wheel member 33 is not affected.

  In the present embodiment, as shown in FIG. 4, a receiving portion 32c is formed at the tip of the tip arm 32, and the screw 51 sent by the receiving portion 32c can be received. The receiving portion 32c is formed with a passage 32e through which the tip of the screw 51 can pass by providing side wall portions 32d on both sides. A vertical guide member 41 is pivotally supported on the side wall 32d so as to be swingable, and is formed so as to receive the vicinity of the tip of the screw 51 sent by the vertical guide member 41.

  The vertical guide member 41 constitutes a guide structure for vertically guiding the leading screw 51 fed by the screw feeding mechanism. As shown in FIG. 7, the vertical guide member 41 is a substantially U-shaped metal member in plan view, and includes a central guide plate portion 41a and side plate portions extending vertically from both side edges of the guide plate portion 41a. 41f.

  The guide plate portion 41a is formed with a substantially U-shaped guide groove 41b that opens in the direction in which the screw 51 enters. The guide groove 41b is for guiding the shaft portion 51a of the screw 51, and may be other than a substantially U shape, a substantially V shape, a substantially U shape, etc. It only needs to be able to guide. The opening 41c of the guide groove 41b is widened so as to be easily inserted into the screw 51. Further, the back portion 41d of the guide groove 41b is inclined in a tapered shape (details will be described later). Further, the distance between the side portions 41e of the guide groove 41b is formed to be substantially the same width as the shaft portion 51a of the screw 51 in order to support the screw 51 from both sides.

  Further, shaft holes 41g are formed through the side plate portions 41f on both sides. This shaft hole 41g is for penetrating a pair of swing shafts 42 for pivotally supporting the vertical guide member 41 so as to swing. As shown in FIGS. 4 to 6, the pair of swing shafts 42 are arranged coaxially and pass through the shaft holes 41 g, and also pass through the support holes 32 f formed through the side walls 32 d of the receiving portion 32 c. To be attached. A retaining ring member 43 is attached to the tip of the swing shaft 42.

  By using the two oscillating shafts 42 divided in this way, a space for allowing the head portion 51 b of the screw 51 to pass is formed between the oscillating shafts 42. Since the screw 51 can pass between the swing shafts 42 in this way, the swing shaft 42 and the screw 51 (guide groove 41b) can be brought close to each other. The overall length of the machine can be shortened.

  The vertical guide member 41 attached in this way is urged by an torsion spring 44 to stand by at an initial position. Specifically, by engaging the torsion spring 44 with the spring engaging portion 41 h formed in the side portion of the vertical guide member 41, the guide plate portion 41 a is substantially perpendicular to the driving direction of the screw 51. It is urged to stand by at the position. When the leading screw 51 is fed by the screw feeding mechanism at this initial position, as shown in FIG. 8, the vicinity of the tip of the shaft portion 51a of the leading screw 51 is fitted into the guide groove 41b.

  In addition, since the distal arm 32 is configured so that the attachment position with respect to the base 31 can be adjusted, even if the screw length of the connecting screw 50 used changes, It is possible to reliably guide the vicinity of the tip of 51 by the vertical guide member 41.

  When the screw 51 is driven after the screw feeding operation, the screw 51 is driven vertically with the shaft 51a guided by the vertical guide member 41 as it is. When the head 51b of the screw 51 hits the vertical guide member 41, the vertical guide member 41 swings in the retracting direction against the urging force of the torsion spring 44, as shown in FIG. 51b passes. For this reason, the screw 51 is vertically guided in the same posture by the vertical guide member 41 from immediately after the screw 51 is fed to immediately before the head 51b of the screw 51 passes.

  By the way, as mentioned above, since the back part 41d of the guide groove 41b is inclined in a tapered shape, the guide structure according to the present embodiment can be pulled out by sliding the screw 51 along this inclination. Specifically, as shown in FIG. 10, when the connecting screw 50 is pulled upward, the tip of the screw 51 hits the inner portion 41 d of the inclined vertical guide member 41 and is guided in a falling direction. Further, since force is applied to the vertical guide member 41 in the swinging direction, the vertical guide member 41 swings in the retracting direction. Thus, by tilting the back portion 41d of the vertical guide member 41, the screw 51 can be smoothly removed from the connecting screw screw tightening machine 10.

  In the present embodiment, as shown in FIG. 11, the angle θ1 formed by the surface of the guide plate portion 41a and the surface passing through the back portion 41d of the guide groove 41b and the shaft hole 41g is 45 degrees or less. Is set. By setting such an angle, the screw 51 can be kept vertical and can easily swing when the head 51b of the screw 51 passes. That is, if this angle is excessively increased (for example, if it is set to 45 degrees or more as indicated by θ2 in FIG. 11), the screw 51 is easily swung by the force applied in the direction D2 when the screw 51 is sent. When the head 51b of 51 passes, it will become difficult to rock | fluctuate with the force added to the direction of D1. On the other hand, by setting the angle small as in the present embodiment, the screw 51 can be supported vertically without swinging even if a force is applied in the direction D2 when the screw 51 is sent. When a force is applied in the direction D1 when the head 51b passes, the head 51b can be swung even with a small force.

  Further, since the guide groove 41b is formed in a substantially U shape, the shaft portion 51a of the screw 51 that has been sent contacts the back portion 41d, but when the head portion 51b of the screw 51 passes, The side part 41e of the guide groove 41b contacts the head part 51b. The force is applied to the side portion 41e of the guide groove 41b when the screw head 51b passes, rather than the case where the screw 51 is fed and force is applied to the guide groove 41b due to the difference in distance from the swing shaft 42. When applied, the vertical guide member 41 can be swung with a small force.

  As described above, according to the present embodiment, the vertical guide member 41 includes the substantially U-shaped guide groove 41b that guides the shaft portion 51a of the screw 51, and when the leading screw 51 is fed by the screw feeding mechanism. When the shaft 51a of the leading screw 51 is fitted into the guide groove 41b and the leading screw 51 fitted into the guiding groove 41b is driven and the head 51b of the leading screw 51 passes, the vertical guide The member 41 swings in the retracting direction. That is, the sent screw 51 is received by the substantially U-shaped guide groove 41b to guide the posture of the screw 51, so that the posture of the screw 51 before driving can be guided. For this reason, since the screw 51 is already vertically guided before driving, it is possible to prevent the connecting screw 50 from being excessively fed by the inertia and to guide the screw 51 vertically. Since the screw 51 continues to be guided vertically during the driving operation, good verticality can be maintained until the end. When the head 51b of the screw 51 passes, the vertical guide member 41 swings in the retracting direction, so that the head 51b of the screw 51 can also pass through without any problem.

  Further, since the posture of the screw 51 is guided by the cantilevered vertical guide member 41, the vertical guide does not need to be box-shaped. For this reason, since the inside of the mechanism is easy to visually recognize, and it is easy to put a hand inside, the screw removal work when the screw 51 is clogged is easy. Moreover, since the vertical guide is not box-shaped, the machine tip can be made small, and the machine can be easily targeted at the time of screw construction.

Further, since the shaft 51a of the screw 51 can be received by the vertical guide member 41, a length for providing the vertical guide member 41 at the tip of the screw 51 is not necessary. Therefore, the nose member 30 can be shortened and the overall length of the machine can be shortened.
In addition, since the structure is simple, the member can be manufactured at low cost by pressing or the like.

  Further, since the back portion 41d of the guide groove 41b is inclined in a taper shape, when removing the screw 51 from the machine, the screw 51 can be pulled out along the back portion 41d inclined in the taper shape. Since the vertical guide member 41 swings, the screw 51 can be easily removed.

  Further, since the vertical guide member 41 is pivotally supported by a pair of oscillating shafts arranged coaxially, a screw 51 can be passed between the pair of oscillating shafts 42. The rotational arc of 41 can be reduced, and the overall length of the machine can be further shortened.

DESCRIPTION OF SYMBOLS 10 Connection screw tightening machine 11 Tool main body 13 Trigger 14 Battery 20 Fastener supply apparatus 21 Base part 22 Base casing 23 Magazine 24 Guide member 24a Guide part 30 Nose member 31 Base part 31a Holding groove 31b Slit 32 Tip arm 32a Contact part 32b Exit 32c Receiving portion 32d Side wall portion 32e Passage 32f Support hole 33 Wheel member 37 Roller arm 38 Roller 40 Spring 41 Vertical guide member 41a Guide plate portion 41b Guide groove 41c Opening portion 41d Back portion 41e Side portion 41f Side plate portion 41g Shaft hole 41h Spring Engagement part 42 Oscillating shaft 43 Ring member 44 Torsion spring 50 Connection screw 51 Screw 51a Shaft part 51b Head 52 Connection band 52a Notch

Claims (3)

A guide structure in a screw feeding mechanism of a screw tightening machine for a connecting screw that sequentially sends a connecting screw in which a plurality of screws are connected by a connecting band to a driving position,
A base part;
A nose member slidably provided at the tip of the base portion;
A vertical guide member removably supported by the nose member for vertically guiding the leading screw sent by the screw feeding mechanism;
With
It said vertical guide member Rutotomoni comprises a generally U-shaped guide groove for guiding the vicinity of the tip of the screw, arranged in a direction perpendicular to the feed direction, and driving direction of the screw of the screw to be sent by the screw feed mechanism It is pivotally supported in a cantilever shape by a swing shaft
An opening is formed on the tip side of the guide groove to drive and guide a screw,
When the head screw is fed by the screw feeding mechanism, the shaft portion of the head screw is fitted into the guide groove, and the head screw fitted into the guide groove is driven to pass through the head of the head screw. A screw guide structure in a screw tightening machine for connecting screws, wherein the vertical guide member is sometimes retracted. Wherein the inner portion of the guide groove, characterized in that is inclined in a tapered shape, the screw guide structure in the connecting screw screwing machine according to claim 1, wherein. It said vertical guide member that rotatably supporting a pair of pivot shaft arranged coaxially to, characterized in that between the pair of pivot shaft is threaded to form the passable claim 1 or 2 A screw guide structure in the connecting screw tightening machine described above.

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