JP2011104764A - Fastener driving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly prevent the drive operation of a fastener at erroneous charging and when a malfunction is generated in feeding. <P>SOLUTION: The fastener drive machine includes a fastener feed mechanism for feeding a connection fastener to an injection port 4 of a nose 3 by the reciprocation of a feed claw 26 and a contact means, the feed claw 26 is provided at an outer side of a feed passage 11 so as to be retreatal and turnable, and an engagement part 43 engaged with the feed claw 26 is provided on the contact means. In a state that the connection fastener in the feed passage 11 presses the feed claw 26 to turn it to the outer side, the engagement part 43 of the contact means moved by pressing the nose 3 to the material to be driven is engaged with the feed claw 26 turned to the outer side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a fastener feed mechanism that feeds a connected fastener housed in a magazine from a fastener feed passage to a nose portion having an injection port, and is slidably provided along the nose portion and pressed against a workpiece. The present invention relates to a fastener driving machine provided with a contact arm that moves relative to the nose portion to enable a fastener driving operation.

  Furthermore, the present invention is used in a fastener driving machine that uses air pressure, fuel gas, or the like as a drive source, and when the fastener is sent to the injection port of the fastener driving machine, it is ensured that the fastener moves in the direction opposite to the feeding direction. The present invention relates to a fastener driving machine for preventing the above.

  For example, a nailing machine using compressed air as a driving source opens and closes the high pressure air in the air chamber with respect to the upper end of the impact cylinder by the operation of the main valve, and the impact is accommodated in the interior by the high pressure air supplied to the impact cylinder. The nail supplied from the magazine to the injection port of the driving nose part provided at the lower part of the nailing machine body is struck by driving means such as a driver and a driver bit that are integrally coupled to the driving piston. It is configured to drive.

  A nail feed passage is provided between the injection port of the nose portion and the magazine, and the connecting nail stored in the magazine is pulled out by the nail feed mechanism and sent from the nail feed passage to the injection port. . The nail is fed by a feed claw provided in the nail feed passage so as to reciprocate in the nail feed direction. The feed claw is located behind the connecting nail aligned with the nail feed passage. When the feed claw moves forward, it engages the nail shaft of the connecting nail and feeds only one nail. Thus, it is configured to repeat the operation of retreating while rotating to the outside of the nail feed passage and engaging with the rear nail shaft portion again (see Patent Document 1).

  In addition, it is very dangerous to always drive out the fastener when the trigger for starting is pulled, so the contact arm is slidably arranged along the nose part, and the tip part of the contact arm is placed at the nose part. When the contact arm moves relative to the nailing machine body and the upper end of the contact arm is engaged with the trigger, the trigger pulling operation is performed. A safety device is provided to enable the nailer to be activated. Therefore, even if the trigger is pulled without pressing the nose portion against the material to be driven, the pulling operation becomes invalid and the nail driver does not start (see Patent Document 2).

  The above-described safety mechanism using the nail feeding mechanism and the contact arm is mounted not only on the nailing machine but also on a screw driving machine for driving a driving screw.

  However, in the conventional nail feeding mechanism, if a malfunction occurs in the middle of feeding the nail, the fed nail is not sent to the normal position, or it is loaded incorrectly, the connecting nail is in the normal position. Even when the contact arm is not sent, the hitting is possible if the contact arm is operated, and there is a possibility that the nail is clogged in the nose portion, causing a problem.

  Therefore, in order to improve this point, it is assumed that the feed claw is raised so that it deeply enters the nail feed passage, and when the nail is loaded, the feed claw is pushed and swung to load it in the normal position. Since the feed claw does not swing sufficiently when it is not, the contact arm interferes with the feed claw, cannot operate to the top dead center, and the safety device is not released (see Patent Document 3). ).

  In general, there are two types of connection fasteners, one connected by metal wire and one connected by synthetic resin material. The connection fasteners connected by synthetic resin material are mainly bent sheet connection method and flat sheet connection method. Two methods are known. Bending sheet connection type connecting fasteners are formed by continuously bending and forming nail holding pieces in the same direction from both side edges of an elongated belt-like sheet portion, and fitting and holding the fasteners to the holding pieces corresponding to both sides. It is. A flat sheet connection type fastener is provided by alternately providing a holding part for holding a fastener and a narrow connecting part for connecting between adjacent holding parts to an elongated flat sheet-like connection band. There are cases where there are a plurality of pieces, and there is also a case where a guide tube having the same diameter as the head is fitted and held on the shaft portion of the fastener. The guide tube guides the fastener so that the fastener does not tilt in the injection port when driven, and usually connecting bands are arranged above and below the guide tube. And most of this flat sheet type connecting fastener is formed in a straight shape.

  By the way, in recent years, a flat sheet connecting type connecting fastener has been developed in which connecting portions for connecting the fastener holding portions are offset, that is, the connecting portions are provided so as to be biased to the right or left in the longitudinal direction of the connecting band. (See Patent Documents 4 to 6). According to this, a connecting fastener using a synthetic resin connecting band can also be wound in a coil shape, and its outer diameter can be easily reduced when wound in a coil shape. There is an advantage that it can be loaded into the magazine.

  By the way, as described in Patent Documents 4 to 6, a fastener driving machine in which the connecting portion is arranged on one side of the connecting band includes a fastener from the magazine storing the connecting fastener to the injection port of the driving nose portion. A zipper feed mechanism is provided for sequentially supplying. This feed mechanism is composed of a feed claw and a check claw, and the feed claw reciprocates in the fastener feed direction, engages with the connecting fastener at the time of forward movement, feeds it to the injection port side, moves backward, and moves backward. Engage with the fastener. On the other hand, the check claw engages with the connecting fastener when the feed claw moves backward to prevent the connecting fastener from moving in the direction opposite to the feed with the feed claw.

Japanese Patent No. 2836512 JP 2005-81515 A JP-A-8-276378 JP 2009-115212 A JP 2009-115213 A JP 2009-264585 A

  However, in the configuration shown in Patent Document 3, the nail feed is stable because the height of the feed claw is high, but it is necessary to rotate the feed claw to swing when loading the connecting nail.

  The present invention solves the above-mentioned problems, and can directly connect a connected fastener without rotating the feed claw, and when the connected fastener is erroneously loaded or a failure occurs in the feed. An object of the present invention is to provide a fastener driving machine that can reliably prevent the fastener driving operation.

  Further, in the fastener driving machine using the conventional flat sheet connecting type connecting fastener as described above, the feed claw or the check claw is moved between the upper and lower connecting bands, and the tip thereof is guided to the guide tube or the fastener. It was comprised so that it might engage with the axis | shaft.

  However, in the structure in which the feed claw or the check claw is engaged with the shaft of the guide tube or the fastener, the claw enters the inside from the outside of the connecting band and engages with it, so it is necessary to swing it greatly. . Therefore, the fastener feeding mechanism is inevitably large. In particular, in the case of a check claw, it is only necessary to hold the connecting fastener so as not to retreat, so that it is not necessary to bother engaging with the fastener shaft.

  Therefore, for example, in the connection band of FIG. 2 of Patent Document 4 described above, the boundary between the nail holding part and the connection part at the outer edge part on the connection part side of the connection band has a certain angle with respect to the boundary between the arc part and the straight line part. Since the dent which has is formed, it is possible to engage a check claw here using this. However, this dent has a shallow angle, and there is a risk that the check claw may slip due to being too gentle. And since the connection belt | band | zone of FIGS. 11-13 of the said patent document 4 has the boundary of a circular arc part and a linear part, there is a possibility that a check claw may engage at two places, and engagement is not stable. There is a problem.

  Moreover, in the case of the connection belt | band | zone of patent document 5, the convex part is formed in the nail holding | maintenance part. This convex part is the remaining part when the connection band formed symmetrically is cut at the center, but even if it is intended to engage the check pawl using this, the check pawl is not necessarily engaged with the convex part. In the same way as in Patent Document 4, there is a case where it engages with a recess at the boundary between the nail holding portion and the connecting portion, and the check claw may be engaged at two locations. Not stable.

  Furthermore, although the connection band of patent document 6 is not a flat sheet type, also in this case, as in the case of patent document 5, the check pawls may be engaged at two locations, and the engagement is not stable.

  A similar problem occurs when the feed claw is engaged with the same part of the connecting band.

  As described above, in any case, even if an attempt is made to use the conventional connecting band as it is for feeding or check, the concave portion is not intended to be engaged in the first place. It is a natural result that the feeding or check of the connecting fastener is not stable because it is intended to be combined.

  Therefore, the present invention solves the above-mentioned problems, and has different types of engagement recesses or engagement projections that can securely feed the connecting strip made of synthetic resin in the feed direction or prevent movement in the reverse direction. It is an object of the present invention to provide a connecting fastener driving machine capable of sharing a check claw with respect to the connecting fastener.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to feeding a fastener feed passage provided so as to open to a driving nose portion at a lower portion of the driving machine body and a connected fastener loaded in the feeding passage. A fastener feeding mechanism that engages with a feed claw provided so as to be movable in the direction and feeds it to the injection port of the nose part, and a driving machine that is slidably provided along the nose part and presses against the workpiece In a fastener driving machine provided with contact means that moves relative to the main body to make the fastener driving activation operation effective, the feed pawl is provided so as to be able to be retracted from the feed passage, and the feed passage includes The connecting fastener can be loaded without rotating the feed claw, and the contact means can be engaged with the feed claw. The provided, when the feed pawl is retracted rotated, characterized in that the engagement portion of the contact means actuated by pressing said contact means to be driven material was made to engage the feed pawl.

  According to a second aspect of the present invention, in the first aspect, the engaging portion is formed on a cylindrical contact top provided at the tip of the contact means.

  The invention according to claim 3 is characterized in that, in claim 1, the engaging portion is configured by an engaging pin provided in the contact means at a position below the retraction claw that has been retracted and rotated.

  According to a fourth aspect of the present invention, in the first aspect, the engaging portion is formed in a movable nose portion provided at the tip of the contact means.

  The invention according to claim 5 is provided so that the fastener feed passage provided so as to open in the nose portion for driving in the lower portion of the driving machine body and the connecting fastener loaded in the feed passage can be moved in the feed direction. A fastener feeding mechanism that engages with the feeding claw and feeds it to the injection port of the nose portion, and connects the fasteners as upper and lower connecting sheets via the upper and lower connecting sheets as the connecting fastener. On one side of each longitudinal direction of the sheet, a connecting fastener having engagement recesses or engagement projections formed at corresponding positions in the upper and lower directions is used, and the interval between the upper and lower engagement recesses or engagement projections is mutually A plurality of different types of connecting fasteners are formed so as to be individually loadable, and the fastener feeding mechanism is connected to the feeding passage. A check claw for restricting the feed operation is provided, and the feed claw or the check claw can be engaged with the upper and lower engagement recesses or engagement protrusions when any of the above-mentioned plural types of connection fasteners is used. It is characterized by being formed.

  The invention according to claim 6 is provided such that the fastener feed passage provided to open to the driving nose portion at the bottom of the driving machine main body and the connecting fastener loaded in the feed passage are movable in the feed direction. A fastener feeding mechanism that engages with the feeding claw and feeds it to the injection port of the nose part, wherein the connecting fastener includes a fastener holding part having a shaft hole for holding the fastener, and an adjacent fastener. And a connecting band that alternately forms the connecting sections that connect the holding section, the connecting section is provided on either side of the connecting band on the left or right side, and the longitudinal direction of the connecting band Engaging fasteners or engaging protrusions are formed at predetermined intervals along the outer edge of the connecting portion, and the fastener feed mechanism is mounted on the feed passage. Is provided with a check pawl for restricting the feeding operation of the connecting fastener, the return-preventing claw is characterized in that it is engageable formed in the engaging recesses or engaging protrusions.

  According to the first aspect of the present invention, if the connecting fastener is normally loaded in the feed passage, the feed claw does not rotate outward, so that the feed mechanism operates reliably and the nail feed is also normal. Done. Also, when the tip of the nose portion is pressed against the material to be driven, the contact means moves by a sufficient amount, so that the trigger lever is effectively activated and the nail is driven normally.

  On the other hand, if the connecting nail is accidentally loaded obliquely or loaded without being properly engaged with the claw portion of the feed claw and the feed passage is forcibly closed, the connection fastener presses the feed claw outward. Therefore, the feed claw is retracted and rotated outward, and the tip of the feed claw moves to a position where it can engage with the contact means. In this state, even if the tip of the contact means is pressed against the material to be driven and slid with respect to the fastener driving machine main body, the engaging portion engages with the tip of the feed claw and the contact means moves further. I can't. When the movement of the contact means is restricted, the starting operation becomes invalid and the nail driving operation cannot be performed. Therefore, it is possible to prevent inconvenience that the nail is clogged in the nose portion.

  According to the invention of claim 2, since the engaging portion is formed on the cylindrical contact top provided at the tip of the contact means, there is no need to provide a special engaging member, and the effect of claim 1 Can be obtained.

  According to the invention of claim 3, since the engaging portion is constituted by the engaging pin provided in the contact means at a position below the retraction claw that has been retracted and rotated, a simple structure called an engaging pin. The effect of claim 1 can be obtained simply by adding.

  In the invention according to claim 4, since the engaging portion is formed in the movable nose portion provided at the tip of the contact means, it is not necessary to provide a special engaging member, and the effect of claim 1 can be obtained. it can.

  According to the fifth aspect of the present invention, the feed claw or the check claw is formed so as to be engageable with the upper and lower engaging concave portions or engaging convex portions, regardless of which of the plurality of types of connecting fasteners is used. . For this reason, the manner in which the check pawl or the feed pawl engages with the engaging portion is the same regardless of the type of the connection nail, and all types of connection nails constituting the system with a common check nail Can be surely executed. Thus, since it is not necessary to change the check claw or the nailing machine for each connecting nail, the overall cost can be significantly reduced.

  Further, since the positional accuracy of the check claw or feed claw is not required, the check claw or feed claw can be formed by sheet metal processing, and the member that supports the check claw or feed claw can be made of synthetic resin. Therefore, the cost of parts can be reduced and the whole can be reduced in weight.

  According to the sixth aspect of the present invention, since the connecting portion is provided on either side of the left and right sides of the center of the connecting band, the feeding claw is reliably engaged on the side opposite to the side where the connecting portion is provided. Can be sent stably.

  Further, on the side where the connecting portion is provided, an engaging recess or an engaging convex portion is formed at a predetermined interval along the outer edge portion on the connecting portion side in the longitudinal direction of the connecting band. A check claw can be engaged with the engaging convex portion. For this reason, the check claw can also be reliably engaged, and the movement of the fastener in the reverse direction can be reliably prevented.

Longitudinal sectional view of a nailing machine which is one form of a fastener driving machine (A) (b) (c) is the figure which looked at the nose part of the said nailing machine from the bottom, and is explanatory drawing which shows the engagement aspect of a feed nail and a contact arm (A) (b) is a front view of the connecting nail and a plan view of the connecting sheet (A) (b) (c) (d) is an operation mode diagram of the nail feed mechanism. Side view of nailing machine showing contact members (A) is a cross-sectional view showing the engagement state of the check claw when the feed claw is moved backward to feed one remaining nail, (b) is an enlarged view thereof, and (c) is a flat check claw. Sectional drawing which shows the engagement state at the time of shape The perspective view which shows other embodiment of a safety device (A) (b) is an explanatory view of the operation mode of the safety device shown in FIG. The perspective view which shows other embodiment of a safety device (A) and (b) are operation mode explanatory views of the safety device shown in FIG. (A) is a perspective view including the door portion of the check mechanism, (b) is a perspective view with the door portion removed. A perspective view showing the relationship between the check claw and the connecting nail A plan view showing the relationship between the check claw and the connecting nail (A) and (b) are perspective views showing a check relationship between a common check nail and a different connecting nail, respectively. (A) (b) is a front view showing a check relationship between a common check nail and a different connecting nail.

(Nailer)
FIG. 1 shows a nailer. The nailing machine is provided with a grip 2 at the rear of the nailing machine body 1 and a nose part 3 having an injection port 4 at the lower part of the nailing machine body 1, and an injection port 4 at the rear of the nose part 3. A magazine 5 for supplying nails is provided continuously, and an impact mechanism is provided in the nailing machine body 1. That is, the striking piston 7 is slidably accommodated in the striking cylinder 6. A driver 8 is integrally coupled and fixed to the lower portion of the striking piston 7, and the driver 8 is configured to slide in the injection port 4 of the nose portion 3. The nail driver main body 1 is formed with an air chamber 10 for storing compressed air supplied from a compressed air supply source (not shown) such as an air compressor (not shown).

  The connection nail (connection fastener) A stored in the magazine 5 is configured to be supplied to the injection port 4 of the nose portion 3 through the feed passage 11. As shown in FIG. 3, the connecting nail A includes a plurality of upper and lower nails a made of synthetic resin, each having a guide tube 12 having an outer diameter slightly smaller than the inner diameter of the injection port 4 at the shaft portion. It is connected via a connecting sheet 13. An engagement recess 14 is formed on one side of the connecting sheet 13.

  More specifically, as shown in FIG. 3, the connecting sheet 13 is a thin elongated belt-like flat sheet shape, and a fastener holding portion 13 c in which a shaft hole 13 d having the same size as the center hole of the guide tube 12 is formed. And the narrow connection part 13b which connects the adjacent fastener holding | maintenance part 13c is formed alternately continuously. The connecting portion 13b is formed to be deviated from the center of the connecting sheet 13 to the left and right (upward in the drawing). For this reason, the outer edge part 13a by the side of the connection part 13b of the connection sheet 13 becomes the shape where the feed claw engagement part 60 was formed between the fastener holding | maintenance parts 13c on the other side substantially straight. Each fastener holding portion 13c of the outer edge portion 13a is formed with an engagement recess 14 as a non-return engagement portion with which a later-described check claw 28 is engaged. The engaging recess 14 is generally triangular in shape, and one end thereof is formed substantially perpendicular to the longitudinal direction of the connecting sheet 13 and the other end is formed obliquely. However, the engaging recess is not limited to this shape. It may be a concave shape, a V shape, a convex shape, or the like. The engaging recesses 14 are provided in the two connecting sheets 13 along the axial direction of the nail a, in other words, at positions corresponding to each other in plan view, and the upper and lower engaging recesses 14. The guide tube 12 is not exposed in between.

  According to the connecting nail A, since the outer edge portion 13a of the connecting sheet 13 is formed substantially straight, as will be described later, the engaging means (the check claw and the feeding claw) of the feeding mechanism of the nail driver is reliable. Since it engages with the engaging recess 14, the feed and check are stabilized.

  Here, when starting the nailing machine, the trigger lever 15 is pulled. As a result, the start valve 16 operates and the main valve 17 opens the air chamber 10 in which the compressed air is stored to the striking cylinder 6, so that the compressed air is rapidly supplied into the striking cylinder 6 and the driver 8 together with the striking piston 7. Is driven and is configured to strike and hit a nail in the injection port 4. The air compressed in the space below the striking piston 7 when nailing is stored in the blowback chamber 18 below the striking cylinder 6 and supplied to the bottom of the striking piston 7 when the compressed air above the striking piston 7 is exhausted. This is returned to the initial position and the next nail driving operation is prepared.

(Feeding mechanism)
By the way, the feed passage 11 is a passage for pulling out the connecting nail A from the magazine 5 and sending it to the injection port 4, and is arranged between the magazine 5 for storing the connecting nail A and the injection port 4 as shown in FIG. 4. And formed between the fixed wall 20 and the door 21. The feed passage 11 is provided with a nail feed mechanism. That is, a feed cylinder 22 is disposed outside the fixed wall 20, and a feed piston 23 is disposed in the feed cylinder 22 so as to be capable of reciprocating in the feed direction. One end of the feed cylinder 22 communicates with the blowback chamber 18 via an air conduit 24 (see FIG. 1). The feed piston 23 is integrally provided with a feed rod 25 protruding forward, and a feed claw 26 is attached to the shaft 19 at the tip of the feed rod 25 so as to be able to retract and rotate from the feed passage 11 and is fed by a spring (not shown). It is urged to enter the passage 11. The feed piston 23 is urged forward by a spring 27 and compressed air is fed into the nail feed cylinder 22 from the blowback chamber 18 via the air conduit 24 at a predetermined timing (immediately after nail driving). When the feed rod 25 and the feed claw 26 are moved backward and the compressed air is discharged, the feed piston 23, the feed rod 25 and the feed claw 26 are moved forward by a spring 27.

  On the other hand, the door 21 opens and closes the nail feed passage 11 and is formed in a box shape, and a check claw 28 is provided inside thereof. The check claw 28 is formed at the tip of a check claw member 29 that is rotatably provided on a support shaft 30 provided on the door 21. The check pawl 28 is formed in a Z shape, and the tip 31 of the check pawl 28 is further bent toward the feed passage 11 side. A torsion coil spring 32 is wound around the support shaft 30, whereby the check claw member 29 is constantly urged toward the center of the feed passage 11 and presses the connecting nail A.

  According to the above feed mechanism, when the nail feed mechanism is actuated after the connecting nail A is loaded in the magazine 5, the feed piston 23 once retracts as shown in FIG. To move forward. When moving forward, the feed claw 26 engages with the feed claw engaging portions 60 of the upper and lower connection sheets 13 of the connection nail A, feeds the connection nail A forward, and the leading nail a as shown in FIG. Supply into the injection port 4. Thereafter, after the nail a is driven out as shown in FIG. 5A, the feed piston 23 moves back again as shown in FIG. 5B, but if the connecting nail A is moved in the opposite direction, (B) As shown in (c), since the check claw 28 engages with the engagement recess 14 of the connecting sheet 13, the connecting nail A cannot move and remains in the same position. For this reason, the feeding claw 26 is retracted and rotated from the feeding passage 11 and is surely detached from the connecting sheet 13. When the feed piston 23 moves forward, the connecting nail A receives force to move forward. Since the check claw 28 cannot engage with the engagement recess 14, the connecting nail A is fed forward. Thus, each time the feed piston 23 reciprocates, one nail is fed to the injection port 4 of the nose portion 3.

  The door 21 is rotatably provided on a door rotation shaft 70 provided along the nose portion 3 as shown in FIGS. The door 21 is obtained by covering the opening of a box-shaped door body 61 with a surface plate 62, and a support shaft 30 is provided between an upper plate 63 and a lower plate 64 of the door body 61. A check claw member 29 is rotatably attached. The check claw member 29 is a plate-like member, and a check claw 28 is formed from the middle part to the front end part, and the rear part is branched into two branches. The front portion of the check claw member 29 is formed in a Z shape, and the tip 31 of the check claw 28 is further bent toward the feed passage 11 side. The check pawl 28 is also divided into upper and lower parts, but may be formed integrally with the upper and lower parts. Further, a support piece 67 that is vertically opposed is formed on the upper portion 65 and the lower portion 66 of the rear portion of the check claw member 29, and the support piece 67 is rotatably fitted to the support shaft 30. A torsion coil spring 32 is wound around the support shaft 30, and one end 32 a is engaged with the back surface of the door surface plate 62, and the other end 32 b is engaged with the intermediate portion of the check claw member 29. Accordingly, the check pawl member 29 is constantly urged toward the center of the feed passage 11 and presses the connecting sheet 13.

  Further, the planar portion 28 b following the tip 28 a of the check claw 28 contacts the outer edge portion 13 a of the connecting sheet 13. Thus, since the check claw 28 and the connecting sheet 13 are in contact with each other for a long time and the contact area is large, the connecting sheet 13 rotates around the engaging portion with the tip 28 when engaged with the engaging recess 14. Therefore, it is possible to reliably prevent the connecting sheet 13 from moving in the reverse direction by controlling the posture of the connecting sheet 13.

  In addition, the engagement recessed part 14 is provided in the up-down direction at the same position on the up-and-down connection sheet | seat 13, as FIG. 12 shows. When the check claw 28 of the nail feeding mechanism engages with the engaging recess 14 of the connecting sheet 13 as described above, the positions of the upper and lower connecting sheets 13 are shown in FIG. Is within the width W1 of the upper portion 28 'of the branched check pawl 28, the check pawl 28 can be reliably engaged with the engaging recess 14. In other words, even if the connecting sheet 13 is displaced within the width dimension, the check pawl 28 engages with the engaging recess 14.

  And even if it cannot engage with one engaging recessed part 14 among the two connection sheets 13, it can engage with the other engaging recessed part 14. That is, as shown in FIG. 15 (b), the upper connecting sheet 13 is positioned within the width W 1 of the upper part 28 ′ of the branched check claw 28, and the lower connecting sheet 13 is branched. Even when the claw 28 is within the width W <b> 2 of the lower portion 28 ″, the check claw 28 can be reliably engaged with the engagement recess 14.

  Thus, the check pawl 28 does not need to be inserted between the connecting sheets 13 of the upper and lower connecting nails as in the prior art. Even if the connection sheet 13 of the connection nail is slightly shifted in position, it is surely engaged with the engagement recess 14 as long as the end face of the connection sheet 13 on the substantially straight connection part 13b side is pressed. Since the non-return function functions, the position of the nail a comes out almost accurately, so that there is no feed failure due to the positional displacement of the connecting sheet 13 in the vertical direction, and reliability and safety are improved.

  Similarly, since the positional accuracy of the check pawl 28 is not required, the door 21 can be formed of the check pawl member 29 by sheet metal processing, and the door main body 31 can be made of synthetic resin. The whole can be reduced in weight.

  Although the branched check claw 28 has been described above, the check claw 28 can be used as long as the positions of the two upper and lower connecting sheets 13 are within the width of the tip 31 of the check claw 28 even when the branch is not branched. Needless to say, can engage with the engaging recess 14.

(Contact material)
Next, as shown in FIG. 5, a contact member 33 is provided along the nose portion 3. This contact member 33 is a safety device, and has a cylindrical contact top 34 disposed so as to protrude from the tip of the nose portion 3, and a first arm 35 that supports the contact top 34 so as to slide in the nail driving direction. And a second arm 36 disposed between the first arm 35 and the trigger lever 15. One end 36a of the second arm 36 is connected to the first arm 35, and the other end 36b is disposed so as to be engageable with a contact lever 37 provided on the trigger lever 15, as shown in FIG. A compression spring 53 is disposed between the second arm 36 and the nose portion 3. As a result, the contact member 33 is biased downward, and the contact top 34 projects downward from the tip of the nose portion 3.

  Even if the trigger lever 15 is pulled and operated with the contact top 34 protruding from the nose portion 3, the contact lever 37 does not operate, so the operation becomes invalid and the nail driver is not activated. . On the other hand, when the contact member 33 slides in a direction to be pushed against the compression spring 53 along the nose portion 3 by pressing the contact member 33 against the workpiece, the second arm 36 The end portion 36b operates the contact lever 37, the pulling operation of the trigger lever 15 becomes effective, and the nailing machine is activated. Even when the sliding amount of the contact member 33 is insufficient, the safety device is not released and the operation of the trigger lever 15 is not effective.

(Feed and contact arm)
By the way, as shown in FIG. 1, the side end portion 42 on the injection port 4 side of the feed claw 26 is extended and formed downward, and the side end portion 42 and the door 21 allow the injection port 4 to be connected to the feed passage 11. (See FIG. 4A). On the other hand, above the contact top 34 of the contact member 33, an engagement portion 43 that can be engaged with the tip (lower end) portion 42 a of the side end portion 42 of the feed claw 26 that is retracted and rotated outside the feed passage 11. (Refer to FIG. 5) is formed, and the feeding claw 26 and the contact member 33 constitute a safety mechanism. The engagement position is set below the position where the contact member 33 can effectively operate the trigger lever 15. When the feed claw 26 does not rotate, the engaging portion 43 of the contact top 34 is configured not to engage with the distal end portion of the feed claw 26 as shown in FIG.

  In the above configuration, when loading the connecting nail A into the feeding passage 11, the door 21 is opened, the connecting nail A is pulled out from the magazine 5, and the leading nail is engaged with the feeding nail 26, as shown in FIG. The door 21 is closed with the connecting nail A aligned with the feed passage 11. If the connecting nail A is normally loaded, the feeding claw 26 does not rotate outward, so that the claw portion 44 of the feeding claw 26 enters the connecting nail A, and the feeding mechanism operates reliably to feed the nail. Is also done normally. Also, when the tip of the nose portion 3 is pressed against the driven material, the contact member 33 moves by a sufficient amount, so that the trigger lever 15 is activated effectively and the nail is driven normally.

  On the other hand, when the door 21 is forcibly closed by erroneously loading the connecting nail A obliquely or by loading it without correctly engaging the claw portion 44 of the feeding claw 26, the door 21 is connected to the connecting nail A. Therefore, the connecting nail A pushes the feed claw 26 outward. For this reason, the feed claw 26 is retracted and rotated outward, and the position of the tip 42a of the feed claw 26 is also moved from the state of FIG. 2A as shown in FIG. In this state, when the nail is driven, the tip of the contact member 33 is pressed against the material to be driven, and the contact member 33 slides relatively upward with respect to the nailing machine body. Since the portion protrudes, the engaging portion 43 comes into contact with the tip 42a of the feeding claw 26 and cannot enter, and the contact member 33 cannot move further upward. When the movement of the contact member 33 is restricted, the pulling operation of the trigger lever 5 becomes invalid and the nail driving operation cannot be performed. The same applies to the case where the feed claw 26 is driven before reaching the forward end as shown in FIG. Accordingly, it is possible to prevent inconvenience that the nail is clogged in the nose portion 3.

  The above-mentioned problem may occur during the feeding of the connecting nail A after the connecting nail A is correctly loaded. Even in such a case, the feeding nail 26 is retracted and rotated outward as described above. Since the movement of the contact member 33 is restricted, a part of the connecting nail A presses the feed claw 26 outward, so that the nail driving operation can be reliably prevented.

  For each of the connecting nails A, although the height of the engaging recess 14 and the length of the nail shaft are different, the shape of the engaging recess 14 is the same, and some of the connecting nails A are continuously formed along the nail axis direction. It can also be combined with a type of connecting nail and a common nailer. In this case, as shown in FIGS. 14 (a) and 14 (b), the nailing machine can individually load the connecting nails A and A 'provided for the combination, as shown in FIGS. 15 (a) and 15 (b). As shown, the check pawl 28 is formed so as to be engageable with an engagement recess having the largest interval between the upper and lower engagement recesses 14 among the engagement recesses 14 of the connecting nails A and A ′. That's fine. That is, if the tip 31 of the check pawl 28 is formed to have a maximum width larger than the maximum interval (for example, H2 in FIG. 15B) among the intervals between the upper and lower engaging recesses 14. Good.

  This makes it possible to reliably prevent different types of connecting nails A and A ′ from moving in the reverse direction by the common check pawl 28 when feeding the connecting nails. The same applies even if the engaging portion is an engaging convex portion or the engaging portion is provided obliquely with respect to the nail axis.

  According to the combination of a plurality of types of connecting nails A, A ′ and a nailing machine having a common check pawl 28 as described above, the check pawl 28 can be shared, Since it is not necessary to change the pawl 28 or the nailing machine, the overall cost can be significantly reduced. In addition, since the scale of the combination is increased, the above effect is further increased.

(Last one)
The front portion of the check claw member 29 is formed in a Z shape, and the tip 31 of the check claw 28 is bent slightly toward the feed passage 11 side. When the feed claw 26 moves backward as shown in FIG. 6A, the tip 31 of the check claw 28 moves into the triangular engagement recess 14 of the connection sheet 13 of the connection nail A as shown in FIG. While engaging, the base part of the check claw 28 is also engaged with the side edge of the connection sheet 13. Therefore, the check claw 28 is engaged with at least two front and rear positions p and q across the center of the nail a. Therefore, when the feed nail 26 returns to the rear of the last nail a after the second nail from the end of the connecting nail A is driven, it moves over the side of the last nail a while retreating. Since 28 is engaged with and supported at the two front and rear positions p and q across the center of the nail axis of the last nail a, the last nail a is prevented from rotating. Therefore, the check claw 28 does not come off from the engaging recess 14 of the connecting nail A, and the last nail a can be reliably fed. On the other hand, as shown in FIG. 5C, when the tip of the check claw 28 'is straight and does not support the rear part of the nail, the rear part of the last nail a moves the feed claw 26 backward. When it is pushed back, it rotates around the engaging portion between the tip of the check claw 28 'and the engaging recess 14 and finally the check claw 28' is detached from the engaging recess 14 and cannot be checked. Therefore, the last nail may not be sent forward.

(Other aspects of the engaging portion)
Next, the engaging portion 43 of the contact member 33 is not limited to a form formed integrally with the contact top 34. You may comprise like FIG. That is, the main arm 46 of the contact member 33 whose upper end is linked to the trigger lever 15 is connected to the guide member 47 that guides the contact top 34 in the driving direction, and the sub arm 48 that is branched from the middle portion of the main arm 46 is connected. An engagement pin (engagement portion) 52 is provided in the lower end bent portion 50, and a compression spring 53 that urges the contact member 33 downward is disposed on the engagement pin 52. The upper end of the engagement pin 52 is disposed so as to be engageable with the feed claw 26 that is retracted and rotated to the outside of the feed passage 11. The engagement position is set below the position where the contact member 33 can effectively operate the trigger lever 15.

  The basic configuration of the nail feed mechanism and the like is the same as that shown in the above embodiment.

  According to the safety mechanism having the above configuration, the door 21 is opened, the connecting nail A is pulled out from the magazine 5, and the leading nail A and the second nail are engaged with the feed claw 26, as shown in FIG. As described above, the door 21 is closed with the connecting nail A aligned with the feed passage 11. At this time, if the connecting nail A is normally loaded, the feeding claw 26 does not rotate outward, so that the feeding mechanism operates reliably and the nail feeding is performed normally. When the nail is driven, the contact member 33 moves upward relative to the nailing machine body without interfering with the feed claw 26 even when the tip of the nose portion 3 is pressed against the material to be driven. Is also effective. Therefore, the nail is driven normally.

  On the other hand, when the door 21 is closed by loading the connecting nail A obliquely or without properly engaging the claw portion of the feed claw 26, as shown in FIG. Since the connecting nail A is pushed by the door 21 and presses the feed claw 26 to the outside, the feed claw 26 is retracted to the outside. In this state, when the contact top 34 is pressed downward against the material to be driven in order to drive the nail, the contact member 33 slides upward relative to the nailing machine body. However, since the feed claw 26 protrudes within the movement range of the engagement pin 52, the engagement pin 52 engages with the feed claw 26. For this reason, the contact member 33 cannot move any further upward, and the pulling operation of the trigger is not effective, so that the nail driver cannot be activated. Therefore, it is possible to prevent inconvenience that the nail is blocked in the nose portion 3.

(Other aspects of contact member)
Next, the configuration of the contact member 33 is not limited to that having the contact top 34. For example, as shown in FIG. 9, a movable nose portion 55 may be provided in place of the contact top 34 at the lower end of the first arm 35 provided with one end engageable with the trigger lever 15. The movable nose portion 55 is a member that is provided in the nose portion 3 so as to be slidable in the driving direction, and is provided with the injection port 4 that is continuous with the injection port 4 of the nose portion 3. It is configured to be launched. An engaging portion 43 is formed at a connecting portion between the second arm 36 and the movable nose portion 55. The engaging portion 43 is also formed so as to be engageable with the feed claw 26 that is retracted and rotated outward.

  The basic configuration of the nail feed mechanism and the like is the same as that shown in the embodiment of FIG.

  In the above configuration, when the connecting nail A is loaded into the feed passage 11, the door 21 is opened, the connecting nail A is pulled out from the magazine 5, and the leading nail of the connecting nail A is engaged with the feeding nail 26, as shown in FIG. The door 21 is closed with the connecting nail A aligned with the feed passage 11 as shown in a). If the connecting nail A is normally loaded, the feeding claw 26 does not rotate outward, so that the feeding mechanism operates reliably and the nail feeding is performed normally. Even when the tip of the nose portion 3 is pressed against the material to be driven, the movable nose portion 55 moves upward with respect to the nailing machine body without interfering with the feed claw 26. Effectively done. Therefore, the nail is driven normally.

  On the other hand, when the door 21 is closed by loading the connecting nail A obliquely or without properly engaging the claw portion 44 of the feed claw 26, as shown in FIG. Since the connecting nail A is pushed by the door 21 and pushes the feed claw 26 outward, the feed claw 26 retreats and rotates outward. When the tip of the nose portion 3 is pressed against the material to be driven in this state, the movable nose portion 55 slides upward relative to the nailing machine body. However, since the feeding claw 26 protrudes during the movement of the engaging portion 43, the engaging portion 43 engages with the feeding claw 26 and cannot move further upward. When the movement of the movable nose portion 55 is restricted, the trigger pulling operation becomes invalid and the nail driving operation cannot be performed. Therefore, it is possible to prevent inconvenience that the nail is clogged in the nose portion 3.

  The above-described problems may occur in the middle of feeding the connecting nail A even after the connecting nail A is correctly loaded. Even in such a case, since the movement of the contact arm is restricted as described above, a part of the connecting nail A presses the feed claw 26 outward, so that the nail driving operation can be surely prevented.

  In the above-described embodiment, the contact member 33 is configured to be able to guide the hammered nail in the driving direction, but is not necessarily limited thereto. The structure which does not guide the hammered nail may be sufficient.

  In addition, although the example of a connection nail was described as a connection fastener in the above-mentioned embodiment, not only a nail but a screw, a driving screw, etc. may be sufficient.

A connecting nail 1 nailing machine body 3 nose part 4 injection port 11 feed passage 13 connecting sheet 13a outer edge part 13b connecting part 13c fastener holding part 14 engaging recess 21 door 26 feeding claw 28 check claw 33 contact member 34 contact top 43 Engagement part 52 Engagement pin 55 Movable nose part

Claims (6)

The fastener feed passage provided to open to the nose for driving at the bottom of the driving machine main body and the connecting fastener loaded in the feed passage are engaged with a feed claw provided to be movable in the feed direction. Fastener feeding mechanism that feeds to the injection port of the nose part, and slidable along the nose part, and moves relative to the driving machine main body by pressing against the material to be driven to effectively activate the fastener driving operation. In a fastener driving machine provided with contact means to be
The feed pawl is provided so as to be retractable from the feed passage, and the connecting fastener can be loaded in the feed passage without rotating the feed pawl, and the contact means is engaged with the feed pawl. A mating engagement part is provided,
The fastener driving machine according to claim 1, wherein when the feed claw is retracted and rotated, an engaging portion of the contact means that is operated by pressing the contact means against the driven material is engaged with the feed claw.   The fastener driving machine according to claim 1, wherein the engaging portion is formed on a cylindrical contact top provided at a tip of the contact means.   2. The fastener driving machine according to claim 1, wherein the engaging portion is configured by an engaging pin provided in the contact means at a position below the retraction claw that is retracted and rotated.   The fastener driving machine according to claim 1, wherein the engaging portion is formed in a movable nose portion provided at a tip of the contact means. The fastener feed passage provided to open to the nose for driving at the bottom of the driving machine main body and the connecting fastener loaded in the feed passage are engaged with a feed claw provided to be movable in the feed direction. In a fastener driving machine provided with a fastener feeding mechanism for feeding to the injection port of the nose part,
As the connection fastener, a fastener is connected via an upper and lower connection sheet, and an engagement concave portion or an engagement convex portion is formed at a corresponding position in the vertical direction on one side in the longitudinal direction of each of the upper and lower connection sheets. Use fasteners,
A plurality of types of connecting fasteners having different intervals between the upper and lower engaging concave portions or engaging convex portions are formed so as to be individually loadable,
The fastener feeding mechanism includes a check claw that regulates a feeding operation of the connecting fastener loaded in the feeding passage,
The fastener is characterized in that the feeding claw or the check claw is formed so as to be able to engage with the upper and lower engaging concave portions or engaging convex portions, regardless of which of the plurality of types of connecting fasteners is used. Driving machine. The fastener feed passage provided to open to the nose for driving at the bottom of the driving machine main body and the connecting fastener loaded in the feed passage are engaged with a feed claw provided to be movable in the feed direction. In a fastener driving machine provided with a fastener feeding mechanism for feeding to the injection port of the nose part,
The connection fastener includes a connection band in which a fastener holding part having a shaft hole for holding a fastener and a connection part for connecting adjacent fastener holding parts are alternately formed, and the connection part is connected to the center of the connection band. It is provided on either one of the left and right sides, and further, an engagement recess or an engagement protrusion is formed at a predetermined interval along the outer edge of the connection band in the longitudinal direction of the connection band. There,
The fastener feeding mechanism includes a check claw that regulates a feeding operation of the connecting fastener loaded in the feeding passage,
The fastener driving machine according to claim 1, wherein the check pawl is formed to be engageable with the engagement concave portion or the engagement convex portion.

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