JP2009072847A - Driving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving machine configured to hardly cause staple jams due to deformation of a staple toe in a width reducing direction. <P>SOLUTION: This driving machine is provided with a magazine storing stoppers each having two legs extending substantially parallel to one another and a fork part and forming a bunch of staples by being coupled together, a staple guide supporting the stoppers from underneath, a staple feeder pressed to an ejection port to sequentially feed the stoppers to the ejection port, a driver blade driving the stopper, and a driving mechanism driving the driver blade, and drives a first staple into a member to be driven in a manner that the first staple positioned at the head end of the bonded stoppers in a pressing direction is struck with the driver blade. The driving machine includes a mechanism for developing load to the outside of both legs of a second staple positioned at the second in the pressing direction by stress from the first staple when striking. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a driving machine that uses a power source such as compressed air to hit a stopper.
More particularly, the present invention relates to a staple feeding mechanism of a driving machine that hits a connected substantially U-shaped stopper and drives it into a material to be driven.

2. Description of the Related Art Conventionally, there is known a driving machine that drives a driver blade and drives a stopper by hitting a stopper. In this driving machine, a magazine containing a bundle in which a plurality of (for example, 25 to 100) staples are fixed by an adhesive or the like is mounted on a nose portion containing a sliding driver blade. Yes. The magazine is provided with a staple guide for supporting the staples from below and a feeder for urging the staple bundle toward the nose portion, and an ejection passage through which the driver blade in the nose portion passes by being urged by the staple feeder. Extruded inside. Staples positioned at the forefront of the urging direction are struck by the driver blade, and at the same time, the adhesive is peeled off one by one and driven out into the non-punch material. In addition, in a special-purpose driving machine, a structure is known in which buckling is prevented by guiding the inside of both legs of the leading staple at the time of striking.

JP-A-6-285811

  An example of a conventional nailing machine will be described with reference to FIGS.

  In general, a staple guide 2a of a conventional nailing machine has an upper surface 4 which contacts a staple fork 6b to support the staple from below and guide it slidably. Further, in the conventional driving machine, the radius or chamfering length of the outer corner portion 5 formed by the inner guide surface 3 of the both ends of the staple of the staple guide and the upper surface 4 of the staple guide is set so that the both feet 6a and the fork 6b of the fastener are It is larger than the bending radius of the connection point 6c. The inventors of the conventional driving machine are second in the urging direction due to the stress at the time of striking the staple 6d (first staple) located at the forefront of the urging direction to peel off the adhesion. It has been discovered that the foot of the staple 6e (second staple) positioned and adhered to the first staple may tilt inward. That is, when the adhesion between the first and second staples is peeled off, the peeling load F1 is applied to both legs 6a occupying most of the adhesive area in the second staple in the injection direction. A load F1 is received by the upper surface 4 of the staple guide. A moment is generated by the axial eccentricity L of the force point of the peeling load F1 and the action point B on the staple guide upper surface, and the width of the staple foot is the width of the fork portion 6b as shown by the broken line in FIG. On the other hand, a load is generated in a decreasing direction. As shown in FIG. 5, when fed to the ejection port 14, the width of the staple foot tip is deformed in a direction that becomes smaller than the width of the fork portion 6 b.

  When the foot portion is deformed in this manner, there is a problem that both feet are driven inward and buckled or clogged in the injection port in the middle of being driven into the wood. In particular, the connected final staple has a problem that it is easily deformed because it receives all the moment due to the peeling load F1.

  An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to make a structure in which staple jamming is unlikely to occur due to deformation in a direction in which the width of the staple foot becomes smaller.

  In order to solve the above-mentioned problems, the present invention comprises a magazine which is connected to form a series and stores a stopper having two legs and a fork extending substantially in parallel, and a staple guide for supporting the stopper from below. And a staple feeder that is urged toward the injection port and sequentially feeds the stopper to the injection port, a driver blade that strikes the stopper, and a drive mechanism that drives the driver blade. A driving machine for driving the first staple located at the foremost end of the biasing direction with the driver blade and driving the first staple into the driven material, the stress from the first staple at the time of hitting, There is provided a driving machine comprising a mechanism for generating a load on the outer sides of both second leg portions of the second staple located in the second direction in the urging direction.

  In the driving machine configured as described above, it is preferable that the staple guide is in contact with the staple at an outer corner portion formed by a stopper both foot guide surface substantially parallel to the staple both feet and an upper surface substantially parallel to the staple fork.

  In addition, it is preferable that an R or chamfering length of an outer corner portion formed by the inner side guide surfaces of the staples of the magazine and the upper surface of the staple guide is smaller than a bending radius of a connection point between both the leg portions and the fork portion of the staple.

  According to such a configuration, when the first staple is driven, a force is generated to spread the second staple foot outward at the contact point between the second staple and the staple guide, and the second staple tip ends. It is possible to prevent the width from being deformed in a direction of decreasing with respect to the width of the fork portion, and thus it is possible to suppress the buckling of the staple at the time of driving.

  A nailing machine of the present embodiment will be described with reference to FIGS. For the sake of simplicity of explanation, the same reference numerals as those in the conventional example are used for the corresponding members in this embodiment, and the stopper driving direction of the nailing machine is defined as the vertical direction and the driven material side is defined as the downward direction. .

  The main body of the nailing machine 1 includes a pressure accumulating chamber 16 that accumulates compressed air supplied from a compressed air source (not shown), a cylinder 25 that slidably houses a piston 26, and a driver blade 7 that is integrally connected to the piston 26. It is equipped with. The upper portion of the piston 26 in the cylinder 25 and the pressure accumulating chamber 16 are separated by a head valve 24 so as to be opened and closed. A head valve chamber 20 is provided above the head valve 24, and the head valve chamber 20 communicates with the control valve 18 through an air passage 19. A push lever 22 installed in the vicinity of the injection port 14, which will be described later, and the upper end in the vicinity of the trigger 21 extends vertically. The push valve 22 and the trigger 21 cooperate to push up the plunger 23 to operate the control valve 18. Is configured to do.

  An injection port 14 is constituted by a blade guide 9 and a guide plate 13 at the lower part of the main body, and the magazine 2 is attached to the blade guide 9.

  The magazine 2 further includes a staple guide 2a that supports the staple 6 from below and a staple feeder 12 that sequentially feeds the staple 6 to the ejection port 14, and the staple feeder 12 is urged toward the ejection port by a ribbon spring 15. ing.

  The staple 6 has an adhesive applied to almost the entire side surface, and the adhesive peeling load is set to be smaller than the driving load of the driver blade 7. The staple 6 is composed of both substantially U-shaped legs 6a and a fork 6b connecting them, and a connecting point 6c between the both legs 6a and the fork 6b is connected with a gentle curve to ensure strength. The curve of the connecting point of commonly used staples has an inner radius of 0.3 mm or more. The nailing machine of this embodiment has a U-shaped inner width of 3.85 mm, a wire diameter of 0.95 mm in the shoulder direction, a connecting direction of 1.25 mm, a connecting portion curve of the inner side R0.3 to 0.6 mm, and a length of 25 to It is a specification that hits a stopper of 50mm or less and a maximum shear strength of 60kg or less.

  The staples 6 loaded so as to straddle the plate-like staple guide 2a are fed from the magazine 2 to the ejection port 14 constituted by the blade guide 9 and the guide plate 13 by the pressing force of the staple feeder 12, and the first staples are fed. Only 6d is in a positional relationship in contact with the driver blade end surface 7a. Accordingly, the outer sides of both legs of the first staple 6 d fed to the ejection port 14 are guided by the blade guide 9. The inner side of both legs 6a of the second staple 6e is guided by the stopper both legs guide surface 3, the lower direction is guided by the staple guide 2a, and the upper direction is guided by the magazine cover 2b.

  The angle of the outer corner portion 5 formed by the both-leg guide surfaces 3 and the upper surface 4 of the staple guide 2a is set to 90 degrees, and this acts as a mechanism for generating a load on the outer sides of the second staple feet in the present invention. The outer corner 5 contacts the connecting point 6c of the second staple 6e and supports the second staple 6e from below.

  At this time, since the staple guide 2a has a thickness of 3.2 mm and the inner width of both legs of the staple 6 is 3.85 mm, the second staple 6e rides 0.275 mm on one side in the thickness direction of the staple guide 2a. Accordingly, a gap is formed between the fork 6b of the second staple 6e and the upper surface 4 of the staple guide 2a. The distance between the magazine cover 2b and the upper surface 4 of the staple guide 2a is set with a margin by calculating the gap.

  A driving operation by the nail driver 1 having the above configuration will be described with reference to FIGS.

  The staple feeder 12 is pulled up against the pressing force of the ribbon spring 15 and the staple 6 is loaded into the magazine 2. The first staple 6d is fed to the ejection port 14. When an air hose (not shown) is connected, a part of the compressed air accumulated in the pressure accumulating chamber 16 flows into the control valve 18 through the air passage 17 and further into the head valve chamber 20 through the air passage 19. Inflow. When both the pulling operation of the trigger 21 and the pressing operation of the push lever 22 against the wood 8 are performed, the plunger 23 in the control valve 18 is pushed up, and the compressed air in the head valve chamber 20 passes through the air passage 19 to the atmosphere. To be discharged. When the compressed air in the head valve chamber 20 is exhausted, the head valve 24 is pushed down by the pressure of the compressed air in the pressure accumulating chamber 16, the upper end of the cylinder 25 is opened, the upper side of the piston 26 in the cylinder 25 is shut off from the atmosphere, and the accumulated pressure is increased. The compressed air in the chamber 16 flows into the upper side of the piston 26 in the cylinder 25, and the piston 26 abruptly moves to the bottom dead center side, and the staple 6 is moved to the wood 8 at the end face 7 a of the driver blade 7 connected integrally with the piston 26. Type in.

  Since the second staple 6e is engaged with the staple guide 2a, the connecting adhesive between the first staple 6d and the second staple 6e is peeled off, and the first staple 6d is guided to the ejection port 14. It is driven into wood 8.

  At this time, the adhesive is peeled off by the impact, and at the same time, the second staple 6e receives a downward peeling load F1 from the first staple 6d. An inward moment acts on both foot portions 6a due to the force point of the peeling load F1 and the axial eccentricity L of the acting point B (outer corner portion 5 of the staple guide 2a).

  On the other hand, the second staple 6e receives a reaction force from the outer corner portion 5 at the connection point 6c. At this time, since the connecting point 6c is a gentle curve, at the connecting point 6c, the second staple 6e as shown by the broken line in FIG. 3 is simultaneously applied to the force in the direction opposite to the peeling load F1 (upward). A load acts in the direction of opening both feet 6a. This load prevents the legs 6a of the second staple 6e from tilting inward.

  The air below the piston 26 flows into the return air chamber 28 via the air passage 27, and when the piston 26 passes through the air passage 30 having the check valve 29 that flows only in the direction of the return air chamber 28, A part of the compressed air flows into the return air chamber 28 through the air passage 30. The piston 26 contacts and deforms the piston bumper 31 at the bottom dead center, and surplus energy after the staple 6 is driven is absorbed.

  When the trigger 21 is returned or the pressing operation of the push lever 22 against the wood 8 is released, the plunger 23 returns to the bottom dead center, and the compressed air in the pressure accumulating chamber 16 flows into the control valve 18 via the air passage 19. Compressed air flows into the head valve chamber 20, the head valve 24 moves to the bottom dead center, the pressure accumulating chamber 16 and the upper side of the piston 26 in the cylinder 25 are shut off, and the upper side of the piston 26 in the cylinder 25 communicates with the atmosphere. The lower side of the piston 26 is pressed by the compressed air accumulated in the return air chamber 28, and the piston 26 and the driver blade 7 suddenly move to the top dead center side. The compressed air above the piston 26 is released to the atmosphere via the air passage 32 and returns to the initial state.

  When the driver blade 7 returns to the top dead center, the second staple 6 e is fed to the ejection port 14 by the pressing force of the ribbon spring 15. When this process is repeated, the connected staples 6 are sequentially driven into the wood 8.

  As will be apparent from the above description of the embodiment, according to the present invention, the R or chamfering length of the outer corner portion 5 formed by the staple both-foot inner guide surface 3 of the staple guide 2 a and the staple guide upper surface 4. Is arranged so as to be smaller than the bending radius of the connecting point 6c between the both legs 6a and the fork 6b of the staple 6, so that the connecting point 6c of the curved line of the staple 6 is intentionally set as shown in FIG. As shown by the broken line in FIG. 3, even though a moment is generated due to the eccentric amount L of the axial line between the force point A of the peeling load F1 and the action point B of the upper surface of the staple guide, it rides on the outer corner portion 5 of the guide 2a. The legs 6a of the second staple 6e are deformed in parallel or in the opening direction.

  Further, due to the above-described deformation of the second staple 6e, the first staple 6d is also loaded in the direction in which both the leg portions 6a are parallel or open until the adhesive bond is peeled off, so that the width of both the leg portions 6a is reduced. Without being deformed in the direction, it is driven vertically into the wood 8 while being guided by the blade guide 9 on the outer sides of both feet. In the present embodiment, five types of staples 6 having lengths of 25, 32, 38, 45, and 50 mm are used, but the present invention has the same effect for all types of staples 6.

  In the above embodiment, the driving machine in which the drive source is the compressed air system has been described. However, the present invention can also be applied to an electric motor system and a gas combustion system driving machine.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. .

Side surface sectional drawing which shows one Embodiment of this invention nailing machine. 1 is an external perspective view showing an embodiment of a staple and a driver blade of the nailing machine of the present invention. Sectional drawing which shows one Embodiment of the positional relationship of the 2nd staple of the cross section AA of this invention nailing machine, a magazine, and a driver blade. Sectional drawing which shows one Embodiment of the positional relationship of the 2nd staple in the cross section AA of a conventional nailing machine, a magazine, and a driver blade. Sectional drawing which shows the state which the 1st staple of the cross section BB of the conventional nailing machine deform | transformed.

Explanation of symbols

  1 is a nailing machine, 2 is a magazine, 2a is a staple guide, 2b is a magazine cover, 3 is an inner guide surface of both staples, 4 is a staple guide upper surface, 5 is an outer corner, 6 is staples, 6a is both feet, 6b 6c is a connecting point, 6d is a first staple, 6e is a second staple, 7 is a driver blade, 7a is a driver blade end face, 9 is a blade guide, 13 is a guide plate, and 14 is an injection port. .

Claims (3)

A magazine that is connected to form a series and stores a stopper having two legs and a fork extending substantially in parallel,
A staple guide for supporting the stopper from below;
A staple feeder that is urged toward the injection port side and sequentially feeds the stopper to the injection port;
A driver blade that strikes the stop;
A drive mechanism for driving the driver blade,
A driving machine for driving the first staple located at the foremost end of the biased direction of the connected stopper with the driver blade and driving the driven staple into the driven material,
A driving machine comprising a mechanism for generating a load to the outside of both legs of the second staple located second in the urging direction due to stress from the first staple at the time of striking. 2. The batting according to claim 1, wherein the staple guide is in contact with the staple at an outer corner portion formed by an inner guide surface of both ends of the fastener substantially parallel to the staple legs and an upper surface of the staple guide substantially parallel to the staple fork. Embedded machine. In the staple guide, the radius or chamfering length of the outer corner formed by the inner guide surfaces of the both ends of the fastener and the upper surface of the staple guide is made smaller than the bending radius of the connection point between the both feet of the fastener and the fork. 3. The driving machine according to claim 2, wherein the driving machine is characterized in that:

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