JP2010064235A - Nailing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nailing machine precisely aligning an injecting groove formed on a bit guide and an injecting groove formed on a contact arm in driving a headless nail. <P>SOLUTION: This box nailing machine is devised so that: the flat bit guide 12 has a roughly V shape, a rod part is branched and extended from the head end of the bit guide 12 to both the right and left sides thereof, and the bit guide 5 is connected to a connecting arm on one side of the rod part; torque 66 works on the contact arm 5 by energizing force generated in the injecting direction on the one side of the rod part in pressing the contact arm 5 on a driven material; and in only either one of clearances in the right and directions between the bit guide 12 and the contact arm 5, the bit guide 12 and the contact arm 5 are abutted by the torque 66 to align the fixed injecting groove 36 and the movable injecting groove 37 when abutted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nailing machine for driving a small head diameter nail or a headless nail without a nail head that requires a clean finish after driving a nail.

  The method of attaching mounting members such as skirting boards and surrounding edges of building interiors is to use a finishing nail with a small head diameter or a headless nail without a nail head after bonding the mounting member with an adhesive. It is common to drive by mounting in a relatively narrow groove provided in the mounting member. The nail is colored with the same color to match the appearance color of the mounting member, and a small diameter is used for driving into the groove of the mounting member, so that no scratches or dents remain on the mounting member. A clean finish is required. In a nailing machine that shoots small-diameter finishing nails or headless nails without a nail head one by one, the contact arm must be pressed against the mounting member to prevent accidental firing of the nail except during driving operations. Nailers that prevent triggers from becoming effective are the mainstream.

  As a contact arm in a conventional nailing machine, for example, there is one described in Patent Document 1. In Patent Document 1, the upper end portion of the nailing machine has an interlocking connecting arm, and the tip portion is aligned and fixed integrally by aligning the tips of both the bit guide and the contact arm to form a nail driving path, The tips of the bit guide and the contact arm are formed as thin and thin as possible as they go into the narrow groove of the mounting member and can be cornered. The set plate protrudes downward from the nailing machine body and is fixed to the nailing machine body together with the magazine. The contact arm supports the set plate so as to be slidable in the vertical direction. It was the structure urged | biased by the spring so that it might be in the state protruded relatively lower than the set plate. According to this configuration, the connecting arm is interlocked by pressing the tip of the contact arm against the mounting member against the biasing force of the spring and sliding the contact arm upward relative to the set plate. The trigger becomes effective for the first time, and then when the trigger is retracted, the nail is fired from the tip of the contact arm through the driving path and driven into the mounting member.

  In a nailing machine that moves the contact arm by pressing the nail driver in the direction of the mounting member, the contact arm is pressed with excessive force when it is pressed, and the contact arm is formed thin and thin. An indentation wound may be left on the mounting member. In order to solve this problem, a technique described in Patent Document 2 has been proposed.

  In the configuration of Patent Document 2, the tip of the contact arm positioned in front of the feed path of the bit guide fixed to the main body side has a substantially flat plate shape, and the injection path through which the leading nail in the feed path is driven out Is formed on the contact arm, and is provided with a pressing means that always presses the contact arm toward the main body, so that the nail can be driven with the contact arm tip lightly applied to the mounting member. The indentation scar is difficult to be attached, and at the same time, it is not necessary to move the contact arm up and down every time the driving operation is performed.

JP-A-7-246575 JP 2002-283253 A

  In the configuration of Patent Document 2, the contact arm is closely abutted against the bit guide so that there is no gap. However, since the contact arm actually needs to slide, the contact arm has a certain gap. In order to press against the mounting member at the time of driving, the engaging portion of the connecting arm is inclined with a force point, and the injection path of the nail provided on the contact arm may be slightly inclined from the feeding path of the bit guide. This phenomenon is not a problem if the headless nail is short, but for example, when using a long nail of 40 mm or more, the nail is parallel to the injection path of the contact arm inclined from the center of the bit guide feeding path. Therefore, the drive bit reaches the surface of the mounting member while passing almost the center of the feeding path of the bit guide even if the drive bit is not properly driven or bent. As a result, there is a concern that the position of scratches caused by the nail driven into the surface of the mounting member and the drive bit may be shifted, resulting in a poor finish.

  Such a phenomenon will be described with reference to FIGS. FIG. 8 (1) is a front view showing an injection part according to a conventional example, showing a state where an upper guide plate and a lower guide plate of the injection part are removed, and (2) is a perspective view showing a shape of a headless nail. It is. The injection portion includes a fixed injection groove 136 formed in the bit guide 112 fixed to the main body side and a moving injection groove 137 formed in the contact arm 105 movable in the vertical direction. Here, the contact arm 105 is slidable in the vertical direction, but in order to slide, the bit guide 112 and the contact arm 105 must be assembled with high accuracy with a gap as small as possible.

  FIG. 9 is a view for explaining the inclination state of the bit guide 112 and the contact arm 105. FIG. 9A shows a state in which the bit guide 112 and the contact arm 105 are positioned in a good state and the axes of the fixed injection groove 136 and the moving injection groove 137 are coincident with each other. Therefore, in this state, the gaps 161, 162, and 163 are in contact with each other with a very small distance (in FIG. 9, the interval is drawn extremely wide for easy understanding, but the actual product is necessary. Have minimal gaps).

  FIG. 9B shows a state in which the urging force 165 acts and the contact arm 105 is inclined with respect to the bit guide 112. In this case, the gaps 161 and 163 are substantially zero and contact with each other, and the gap 162 is increased. When the contact arm 105 is tilted in this way, the axes of the fixed injection groove 136 and the moving injection groove 137 are inclined by + θ1. FIG. 9 (3) shows a state in which the contact arm 105 is inclined in the opposite direction to (2), the gaps 162 and 164 come into contact with almost zero, and the gaps 161 and 162 are enlarged. In the case of FIG. 9 (3), the axes of the fixed injection groove 136 and the moving injection groove 137 are inclined by −θ2.

  As described above, in the structure of the conventional example shown in FIGS. 8 and 9, it is difficult to ideally align the contact arm 105 with respect to the bit guide 112 and an inclination is inevitably generated. When attempting to drive a nail that is longer than the nail used, for example, a 40-60 mm nail, the nail may be bent without being driven normally.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a nailing machine that can prevent bending of a nail to be driven.

  Another object of the present invention is to provide a nailing machine capable of accurately aligning the injection groove formed in the bit guide and the injection groove formed in the contact arm when the nail is driven.

  Still another object of the present invention is to provide a nailing machine in which the finish of the driven material after driving is improved by driving the nail straight.

 Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, a hit driving means having a driver blade for hitting a nail, a bit guide having a fixed injection groove for guiding a nail hit by the driver blade, and a fixed injection groove fixed to the bit guide. Is connected to the magazine for feeding the nail, the contact arm is movable in the moving direction of the driver blade, and the moving injection groove of the injected nail is formed, and the contact arm is attached in the injection direction according to the operation of the trigger. In a nailing machine that has a connecting arm that urges and drives a nail while contacting a contact arm with a material to be driven, the bit guide has a substantially V-shaped flat plate shape, and a ridge portion on both the left and right sides from the tip side. Branched and extended, connected to the connecting arm on one side of the collar, and when the contact arm is pressed against the workpiece, it does not occur in the injection direction on one side of the collar The rotational force acts on the contact arm by the urging force, and only one of the left and right clearances of the bit guide and the contact arm is abutted by the rotational force. Aligned. The bit guide has a substantially T-shape with the center tip protruding in the injection direction, and the contact arm and the bit guide are arranged so that the flanges are arranged along both sides of the protruding fixed injection groove. Is done.

  According to another feature of the present invention, when a rotational force is applied to the contact arm, the contact arm and the bit guide come into contact with each other on the same side as the operating point below the rotation center, and above the rotation center. In this case, the contact arm and the bit guide are brought into contact with each other at the flange portion on the opposite side to the operation point. In particular, when an urging force is applied in the injection direction on one side of the buttock, on the upper side of the buttock, the buttock on the side opposite to the heeling side on which the urging force acts is in contact with the bit guide. On the side, it is preferable that the flange on the same side as the flange on which the urging force acts is in contact with the bit guide.

  According to still another feature of the present invention, it is preferable that there are two places that abut on the upper side of the buttock and one place that abuts on the lower side of the buttock. The left and right sides near the lower end of the fixed injection groove of the bit guide have parallel outer wall portions, and the inner side near the lower end of the contact arm flange portion has a parallel inner wall portion. The inner wall and the outer wall corresponding to the inner wall abut. In addition, a spring is provided between the contact arm and the bit guide so as to urge each other in the axial direction.

  According to the first aspect of the present invention, when the contact arm is pressed against the workpiece, a rotational force is applied to the contact arm by the biasing force generated in the injection direction on one side of the flange, and the bit guide and the contact arm are generated by the rotational force. Since the fixed injection groove and the moving injection groove are aligned when abutting only one side of the gap in the left and right direction of the nail, the nail and the contact arm that are driven into the surface of the driven material It can be driven in without shifting the position of the scratch due to, and the finish can be improved.

  According to the second aspect of the present invention, the bit guide has a substantially T-shaped shape with the tip of the central portion protruding in the injection direction, and the flange portion is disposed along both sides of the protruding fixed injection groove. In addition, since the contact arm and the bit guide are arranged, the tip (lower end) of the contact arm can be made thin and the shape of the tip can be made narrow, so that it is easy to work in a narrow groove such as a mounting member. Furthermore, the contact arm can be stably slidably held by the bit guide.

  According to the invention of claim 3, when a rotational force is applied to the contact arm, the contact arm and the bit guide are in contact with each other at the flange on the same side as the operation point below the rotation center, and above the rotation center. Since the contact arm and the bit guide are in contact with each other on the side opposite to the point of action, the contact arm can be in good contact with the bit guide at the position where the contact arm becomes the reference surface, and move with the fixed injection groove. It is possible to position the injection groove with high accuracy.

  According to the invention of claim 4, when a biasing force acts in the injection direction on one side of the collar, the collar on the side opposite to the collar on which the biasing force acts on the upper side of the collar is the bit guide. Since the collar part on the same side as the collar side where the urging force acts is in contact with the bit guide at the lower side of the collar part, it can be held well at the contact point that resists the rotation direction, so that the fixed injection It is possible to align the groove and the moving injection groove with high accuracy.

  According to the invention of claim 5, there are two places that abut on the upper side of the collar part, and one place that abuts on the lower side of the collar part, so that it is not affected by the flatness of the abutting surface, The fixed injection groove and the moving injection groove can be well aligned.

  According to the invention of claim 6, the left and right sides near the lower end of the fixed injection groove of the bit guide have parallel outer wall portions, the inner side near the lower end of the flange portion of the contact arm has a parallel inner wall portion, and at the time of injection, Since the inner wall on the heel side where the urging force acts and the outer wall corresponding to the inner wall abut, it is difficult to produce backlash in the left-right direction, and a contact arm with high mounting rigidity can be realized.

  According to the seventh aspect of the present invention, since the spring for urging each other in the axial direction is provided between the collar portion on which the urging force of the contact arm acts and the bit guide, the contact arm is urged by the urging force of the spring. And the contact state of the bit guide can be satisfactorily maintained.

   The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. In the present specification, the direction shown in FIG. 1 is defined as the vertical direction and the front-rear direction, and the direction shown in FIG. 4 (2) is defined as the left-right direction.

  FIG. 1 is a side view showing the entirety of a nailing machine according to an embodiment of the present invention, partially showing a cross section thereof. FIG. 2 is a partial side view seen from the opposite side of FIG. The nail driver 1 has a striking drive means including a piston 14 for driving a tip of a nail connected by reciprocating in a cylinder 20 with compressed air, and a driver blade 18 connected to the piston 14. The hitting drive means is built in the housing 11. The housing 11 is provided so as to protrude downward from the end portion thereof, and an injection portion 26 for driving the headless nail 8, and a handle 15 provided orthogonally to the housing 11. And a magazine 2 that is arranged substantially parallel to the handle 15, accommodates the connecting nails, and supplies the connecting nails one by one into the injection portion 26.

  A switch 23 for controlling the driving operation of the nail driver 1 is disposed near the attachment portion of the handle 15 to the housing 11, and is pulled near the switch 23 by a finger of an operator's hand holding the handle 15. A trigger 3 to be operated is provided. The contact arm 5 is positioned below the bit guide 12, is supported by the bit guide 12 so as to be slidable up and down, and is connected to a connecting arm 6 capable of reciprocating upward. The upper end portion 62 of the connecting arm 6 extends to the vicinity of the trigger 3, and the contact arm 5 and the connecting arm 6 are integrally slidable in the vertical direction. An injection groove, which will be described later, for guiding a headless nail to be driven out is provided at the lower end (tip) of the contact arm 5.

  The trigger 3 is pivotally supported by the housing 11 so as to be able to be rotated about the rotation shaft 22 as a fulcrum, and a plunger 4 that protrudes downward and is supported so as to slide up and down is located at the center of the switch 23. . When the plunger 4 is at the bottom dead center (extended state), the nailer 1 is kept in the OFF state, and the switch 23 is turned on in the process in which the plunger 4 moves from the bottom dead center to the top dead center (contracted state). Thus, the driving operation of the nail driver 1 is started. The trigger 3 is provided with a trigger arm 19 pivotally supported by a pivot 24 provided at one end of the trigger 3, and the free end of the opposite trigger arm 19 is in a position where it engages with the upper end 62 of the connecting arm 6. It is provided and comes into contact with the tip of the plunger 4 at substantially the center.

  As shown in FIG. 8 (2), the headless nail 8 has a length of about 10 mm to 60 mm, a shaft diameter of 0.6 to 0.7 mm, and a very small shaft diameter. The nail head diameter is the same as the nail shaft diameter. About 100 of these pin-shaped nails are connected in parallel with an adhesive or the like, and are set in the magazine 2 as headless nails 8.

  FIG. 2 is a side view of the nailing machine according to the embodiment of the present invention from the opposite side to FIG. In FIG. 2, the lower end of the connecting arm 6 is fixed near the upper end of the contact arm 5, and the upper end 62 of the connecting arm 6 extends to the vicinity of the trigger 3.

  FIG. 3 is a cross-sectional view of the injection unit 26 and the magazine 2 of FIG. The magazine 2 has a feeding member (not shown) for moving the headless nail 8, and the feeding member is urged forward (blade guide 12 side) by a spring. The nail driver 1 is provided with a bit guide 12 fixed to the housing 11 and extending downward. The bit guide 12 has a feeding path for guiding the headless nail 8 and a fixing for guiding the headless nail 8. An injection groove 36 is formed.

  Next, the operation of the nailing machine according to the present embodiment will be described. In FIG. 1, the operator lightly touches the lower end of the contact arm 5 against the surface of the workpiece 9. Next, the operator pulls the trigger 3 to activate the nailing machine 1. By pulling the trigger 3, the trigger 3 is rotated to the switch 23 side. As a result, the pivotal support portion 24 of the trigger arm 19 moves rearward, so that the central portion of the trigger arm 19 comes into contact with the tip of the plunger 4 of the switch 23. As a result, the distal end portion of the plunger 4 serves as a fulcrum, and the free end portion of the trigger arm 19 tries to push down the upper end portion 62 of the connecting arm 6 (to move downward) with the pivot portion 24 serving as a power point. However, since the lower end portion of the contact arm 5 is in contact with the workpiece 9, the contact arm 5 is not pushed down and the upper end portion 62 is prevented from moving downward. Since the contact arm 5 does not move downward due to this movement prevention, the plunger 4 is pushed up by the substantially central portion of the trigger arm 19 as the trigger 3 is pulled, the switch 23 is turned on, and the piston 14 is moved by the action of the compressed air. The headless nail 8 is driven by moving and the driver blade 18 attached to the piston 14 rapidly moving downward. Since the mechanism for moving the driver blade 18 by the action of compressed air is known, the description thereof is omitted here.

  FIG. 4 is a front view of the injection portion 26 of FIG. 1 with the upper guide plate 10 and the lower guide plate 25 removed, as viewed from the front side. In FIG. 4 (1), the contact arm 5 is fixed to the lower end portion 61 of the connecting arm 6 at one location, and in this figure, the contact arm 5 is pushed downward by the connecting arm 6. A fixed injection groove 36 is formed in the bit guide 12, and a fixed injection path for guiding the headless nail 8 is defined by the upper guide plate 10 screwed to the bit guide 12 and the fixed injection groove 36. A moving injection groove 37 is formed in the lower end portion 51 of the contact arm 5, and the lower end (lower end portion in the figure) of the moving injection groove 37 becomes the injection port 31. A lower guide plate 25 is screwed to the contact arm 5, and a moving injection path for guiding the headless nail 8 is defined by the lower guide plate 25 and the moving injection groove 37. Here, the moving injection groove means an injection groove formed by a member (contact arm 5) moving in the vertical direction, and the fixed injection groove is formed by a member (bit guide 12) that does not move in the vertical direction. It means the injection groove made. The contact arm 5 is always pressed upward (in a direction in which the contact arm 5 approaches the cylinder 20) by a spring 17 provided between the bit guide 12 and the load of the spring 17 is a spring 63 of the plunger 4 (FIG. 3). ) And the pressure applied to the plunger 4 is set smaller than the load pressed downward.

  FIG. 4B is a view for explaining the shape of the contact arm 5. The contact arm 5 has (1) a substantially triangular lower end 51, (2) an inner wall that branches from and opposes the lower end 31 and extends upward substantially parallel to the left central collar 52 a located at the center of the contact arm 5. And the right side center rod 52b, and (3) the left side center rod 52a and the left side guide rod 53a and the right side guide rod 53b, which are located at the center of the contact arm 5 and extend upward from the right center rod 52b. The shape is substantially V-shaped when viewed from the front. The inner wall side of the contact arm 5 is in contact with the outer wall of the bit guide 12 mainly by the protruding portions 54a, 54f, 54g and the parallel inner walls 54c, 54d, and is supported by the bit guide 12 so as to be slidable in the vertical direction. The guide convex portions 12a and 12b of the bit guide 12 are arranged to face the linear inner walls 54b and 54e of the contact arm 5, but they do not need to be contacted for sliding, and the guide convex portions 12b When the upper surface is in contact with the protruding portion 54f, it serves as a stopper that defines the sliding range of the contact arm 5 in the vertical direction.

  The contact arm 5 is formed with a moving injection groove 37 at the lower end 51 and two guide grooves 38 for guiding the driver blade 18 on both sides thereof. In the vicinity of the foot receiving portion 27 of the bit guide 12, the inner walls 54 c and 54 d of the contact arm 12 abut on the outer wall of the bit guide 12. Ideally, this contact should not leave a gap at all in order to prevent rattling, but it cannot slide without a gap, so the minimum gap necessary for smooth sliding is provided. Spaced apart.

  The contact arm 5 is formed with a rectangular cutout 55 in the vicinity of the upper end of the left guide rod 53a, and the lower end 61 of the connecting arm 6 is fitted into the cutout 55. Therefore, since a downward force acts on the contact arm 5 at the notch 55, a rotational force acts around a certain point (rotation center).

  FIG. 5 is a diagram for explaining the rotational force acting on the contact arm 5 and the force point acting thereby. In FIG. 5 (1), when a force as indicated by an arrow 65 is received from the connecting arm 6, the contact arm 5 is subjected to a rotational force as indicated by an arrow 66. In this embodiment, in this case, a force is applied at the three locations indicated by the arrows 57a to 57c, and the contact arm 5 and the bit guide 12 are satisfactorily brought into contact or in close contact with each other. That is, below the rotation center, the contact arm 5 and the bit guide 12 are in good contact with each other on the same side as the operation point (guide rod and center rod), and above the rotation center, on the side opposite to the operation point. The contact arm 5 and the bit guide 12 make good contact. In the present embodiment, the fixed injection groove 36 and the moving injection groove 37 are arranged in a straight line when the force is applied and contacted in the directions of the arrows 57a to 57c. For this reason, when the headless nail 8 is ejected, the state shown in FIG. 5 (1) is always obtained, so that the axes of the fixed ejection groove 36 and the moving ejection groove 37 are exactly aligned, and the inclination of the ejection groove can be effectively prevented. .

  FIG. 5B is a virtual diagram showing a state in which the contact arm 5 is rotated in the opposite direction to the arrow 66 (FIG. 4B) for comparison. Here, for the sake of illustration and for ease of understanding, the distance between the holding arm 54 and the guide arm 55 of the contact arm 5 is schematically illustrated in an enlarged manner. When the rotational force in the reverse direction indicated by the arrow 67 acts on the contact arm 5 and the center of rotation is in the vicinity of the arrow 67, the contact arm 5 and the bit guide 12 come into contact with each other at three positions 58a to 58c. In this case, in the configuration of the present embodiment, the axes of the fixed injection groove 36 and the moving injection groove 37 have a shift of the angle θ. That is, in this embodiment, when the rotational force as shown by the arrow 66 in FIG. 5A is applied, the fixed injection groove 36 and the moving injection groove 37 are configured so that the axes thereof coincide with each other, as shown in FIG. Thus, when the rotational force of the arrow 67 worked, it was comprised so that the axis line of the fixed injection groove 36 and the movement injection groove 37 may shift | deviate.

  However, during the actual driving operation, the urging force as shown by the arrow 65 is always working from the connecting arm 6, so that the rotational force in the direction as shown in FIG. Therefore, in this embodiment, when the headless nail 8 is driven, the state shown in FIG. 5 (1) is always obtained. As a result, the fixed injection groove 36 and the moving injection groove 37 are straightly aligned, so that the nail can be driven straight. This improves the nail positioning accuracy. Further, by configuring as in the present embodiment, it is not necessary to focus much on reducing the distance between the contact arm 5 and the bit guide 12, so that the contact arm 5 can be smoothly slid.

  FIG. 6 (1) is a diagram showing a state when the headless nail 8 is driven by the driver blade 18. At this time, a force acts in the direction of the arrow 65 by the urging force of the connecting arm 6. This force acts only on the left guide rod 53a of the contact arm 5. On the other hand, the reaction force received from the driven material 9 acts upward on the axis of the injection groove as shown by an arrow 66. Accordingly, the same rotational force as the arrow 66 in FIG. 5 (1) acts and the contact arm 5 and the bit guide 12 are in good contact at the three positions indicated by the arrows 57a to 57c, so that the fixed injection groove 36 and the moving injection groove 37 are The headless nail 8 that is properly aligned and driven can be prevented from bending, and stable nailing can be performed.

  FIG. 6B is a diagram showing a state when the driving is completed. Even in this state, the direction of the force acting on the contact arm 5 does not change, so the contact arm 5 and the bit guide 12 remain in good contact. In the shape of this embodiment, the protrusion 56a on the upper surface of the left guide rod 53a of the contact arm 5 is in contact with the bit guide 12, but the upper surface of the right guide rod 54b is not in contact with the bit guide 12. As a result, the direction of the rotational force acting on the contact arm 5 by this contact does not change, and the contact state at the three positions indicated by the arrows 57a to 57c is not affected at all, so that stable nailing can be performed.

  As apparent from the above description, according to the present invention, the injection groove of the contact arm is accurately aligned with the injection groove of the bit guide at the time of injection. Therefore, it is possible to effectively prevent the nail from bending and to perform good driving. In addition, since the position of the nail does not shift, the finished state after the nail is driven can be improved.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the present invention is applied to the structure of the conventional example shown in FIG. The direction of the force acting at the connection point of the connecting arm is the direction of the arrow 71, and a rotational force acts in the direction of the arrow 72. In this embodiment, the contact arm 105 and the bit guide 112 are in good contact with each other on the same side as the operating point as indicated by an arrow 73 below the center of rotation (in the vicinity of the arrow 72), and an arrow above the center of rotation. As shown in 74, the contact arm 105 and the bit guide 112 are in good contact with each other on the opposite side to the point of action, and the fixed injection groove 136 and the moving injection groove 137 are aligned straight in such a contact state. In the present embodiment, the contact arm 105 and the bit guide 112 are not in contact with each other in the vicinity of the lower end portion of the fixed injection groove 136 (in the vicinity indicated by the arrow 75). However, this is due to the structure in which the contact arm 105 and the bit guide 112 are opposed to each other with a relatively large gap in the vicinity thereof, so that they contact well at the point indicated by the arrow 75 instead of the vicinity indicated by the arrow 73. Anyway.

  As described above, according to the present invention, the contact arm that rotates slightly by the action of the connecting arm is located above the center of rotation on the side opposite to the side on which the force of the connecting arm acts, and below the center of rotation. Make sure that the contact arm and the bit guide are in good contact with the side on which the force of the connecting arm acts, and the fixed injection groove and the moving injection groove are aligned straight when this contact is made. This alignment is always achieved when driving, so even long nails can be driven straight.

  As mentioned above, although demonstrated based on embodiment which shows this invention, this invention is not limited to the above-mentioned form, A various change is possible within the range which does not deviate from the meaning. For example, in the present embodiment, the left guide rod 53a of the contact arm 5 is joined to the connecting arm 6 in the left guide rod 53a, but this may be used as the right guide rod 53a. In that case, the contact point may be configured to be symmetrical with respect to the central axis of the fixed injection groove 36 and the moving injection groove 37.

  In the present embodiment, the example in which the rotation center of the contact arm is near the center in the vertical direction has been described. However, the present invention can be similarly applied even when the rotation center is near the upper end or the lower end of the contact arm. In that case, when it is near the upper end, the contact arm and the bit guide should be in good contact with the side on which the force of the connecting arm acts, and when it is near the lower end, the side on which the force of the connecting arm acts The contact arm and the bit guide should be in good contact with each other on the opposite side.

  Furthermore, in this embodiment, compressed air is used as a power source for the nailing machine. However, the present invention can use various types of power sources such as an electric motor, an internal combustion engine, and gas as well as compressed air. Further, the present invention can be widely applied to any power tool that uses a contact arm as well as a nailing machine for headless nails.

It is a side view which shows the whole nailing machine which concerns on embodiment of this invention, and shows the cross section in part. FIG. 2 is a partial side view of the nailing machine according to the embodiment of the present invention, as viewed from the side opposite to FIG. 1. It is a fragmentary sectional view of the attachment part of the injection part 26 and magazine 2 of FIG. It is a side view which shows the state which removed the upper side guide plate 10 and the lower side guide plate 25 of the injection part 26 of FIG. It is a figure for demonstrating the rotational force which acts on the contact arm 5, and the force point which acts by it, (1) is a figure which shows the state at the time of the clockwise rotational force having arisen in the contact arm 5, (2 ) Is a diagram showing a state when a clockwise rotational force is generated in the contact arm 5. In the nail driver according to the embodiment of the present invention, it is a diagram for explaining the state when the headless nail 8 is driven, (1) shows a state in the middle of driving, (2) is a state when the driving is completed Indicates. It is a figure for demonstrating the rotational force which acts on the contact arm 105 which concerns on the 2nd Embodiment of this invention, and the force point which acts by it. (1) is a front view showing an injection part according to a conventional example, showing a state where an upper guide plate and a lower guide plate of the injection part are removed, and (2) is a perspective view showing a shape of a headless nail. It is an enlarged view of the injection part of the nailing machine by a prior art example, and is a figure for demonstrating the inclination state of a guide plate and a contact arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nailer 2 Magazine 3 Trigger 4 Plunger 5 Contact arm 6 Connection arm 8 Headless nail 9 Placed material 10 Upper guide plate 11 Housing 12 Bit guide 12a, 12b Guide convex part 13 Feeding member 14 Piston 15 Handle 17 Spring 18 Driver blade 19 Trigger arm 22 Rotating shaft 23 Switch 24 Pivot
25 Lower guide plate 26 Injection portion 27 Foot receiving portion 31 Injection port 36 Fixed injection groove 37 Moving injection groove 38 Guide groove 51 Lower end portion 52a (of contact arm) Left guide rod 52b (of contact arm) Right side (of contact arm) Guide rod 53a (center of contact arm) Left side center rod 53b (Contact arm) right side center rod 54a, 54f, 54g Projection 54b, 54c, 54d, 54e Inner wall 55 (Contact arm) Notch 56a Upper projection 56b Right center Top wall 61 of the fence
62 Upper end of the connecting arm 63 Spring 105 Contact arm 112 Bit guide 117 Spring 55 Notch of the contact arm
136 Fixed injection groove 137 Moving injection groove 161, 162, 163, 164 Clearance

Claims (7)

Striking drive means having a driver blade for striking a nail;
A bit guide having a fixed injection groove for guiding the nail hit by the driver blade;
A magazine fixed to the bit guide and connected to the fixed injection groove, and feeding the nail;
A contact arm that is movable in the movement direction of the driver blade and has a movement injection groove for the nail to be injected; and a connecting arm that urges the contact arm in the injection direction in accordance with a trigger operation, In a nailing machine for driving the nail while bringing the contact arm into contact with the workpiece,
The bit guide has a substantially V-shaped flat plate shape, and a collar portion branches and extends from the tip side to the left and right sides, and is connected to the connecting arm on one side of the collar portion,
When the contact arm is pressed against the workpiece, a rotational force acts on the contact arm by an urging force generated in the injection direction on one side of the collar, and the rotational force of the bit guide and the contact arm in the left and right direction has A nailing machine characterized in that only one of the gaps is abutted and the fixed ejection groove and the movable ejection groove are aligned when abutting.   The bit guide has a substantially T-shaped shape with a center end protruding in the injection direction, and the flange is disposed along both sides of the protruding fixed injection groove. 2. The nailer according to claim 1, wherein the bit guide is disposed.   When a rotational force is applied to the contact arm, the contact arm and the bit guide are in contact with each other on the same side as the operating point below the center of rotation, and the operating point and the horizontal direction are above the center of rotation. 3. The nailing machine according to claim 2, wherein the contact arm and the bit guide are in contact with each other at the opposite flange portion.   When a biasing force is applied in the injection direction on one side of the collar, the collar on the side opposite to the collar on which the biasing force acts is in contact with the bit guide on the upper side of the collar. 4. The nailing machine according to claim 3, wherein, on the lower side, a hook part on the same side as the hook side on which an urging force acts contacts the bit guide.   4. The nailing machine according to claim 3, wherein there are two places that abut on the upper side of the collar part, and one place that abuts on the lower side of the collar part.   Both the left and right sides near the lower end of the fixed injection groove of the bit guide have parallel outer wall portions, and the inner side near the lower end of the flange portion of the contact arm has a parallel inner wall portion, and a biasing force acts upon injection. The nailing machine according to claim 4 or 5, wherein the inner wall on the side and the outer wall corresponding to the inner wall abut.   The nailing machine according to claim 6, wherein a spring for biasing each other in an axial direction is provided between the contact arm and the bit guide.

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