JP2009045741A - Nail driving machine for driving staple - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of buckling, and to secure pulling resistance force. <P>SOLUTION: In a nail driving machine for driving staples, a driver 6 provided in a tool body 1 is slidably guided to an injection port 13 of a nose part 3. The staple s formed by bending parallel leg parts 19 at both ends is supplied to the injection port 13 from a magazine 4 provided at the rear part of the nose part 3 and is driven downward from the nose part 3 by the driver 6. On the nose part 3, an inside guide 20 for guiding the inner surface of both leg parts 19 in a driving direction is provided at a position corresponding to a portion between both leg parts 19 of the staple s supplied to the injection port 13. The inside guide 20 is composed of a groove-like inside guide part 24 formed on a front wall 30 of the injection port 13 of the nose part 3 for guiding front parts of the both leg parts 19 of the staple s supplied in the injection port 13 to the driving direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a staple nailing machine that guides and drives staple legs when a staple is driven mainly into wood by a nailing machine in fields related to architecture and civil engineering.

  For example, when constructing a floor material via an intermediate material on a base material (neatwood), staples are obliquely driven from the male ridges of each floor material, and further through the intermediate member, further base material (neutral wood) In the case of driving into a staple, it is necessary to use staples having long legs of about 50 mm. Moreover, it is important that when the staple is driven, in addition to driving so as not to buckle, it is necessary to ensure sufficient pulling-out strength so that the floor material does not lift from the base material after driving.

  However, the conventional staple has an angle at the tip of each leg so that the penetration resistance of the leg when driven is reduced. Then, depending on the angle, the leg portion squeezes inward or opens outward (see Patent Document 1 and Patent Document 2). However, when the tip angle is equilateral and equiangular, especially in the case of staples having a narrow interval between the leg portions, the leg portions tend to squeeze inward when the staple is driven into the wood. When it is hit by the driver of the nail driver during driving, it receives penetration force when the tips of both legs pierce the wood, whereas it receives impact force from the driver from the top, so both legs bend outwards, For this reason, one leg part enters toward the other leg part. In particular, the tendency that the width of the crown part connecting both the leg parts is narrow and the leg part is long is remarkable. When both the leg portions 2 of the staple that has entered the wood are narrowed, the same is true when the both leg portions enter in parallel, but the pulling strength is reduced. The pulling-out strength is rather greater when both legs are moved away from each other.

  In addition, if the leg portion is narrowed during driving as described above, there is a high possibility that the tips of the leg portions will collide with each other and buckling will occur.

Therefore, in order to prevent such a stenosis phenomenon, a technique has been proposed in which the angle of the leg tip is made asymmetric to control the approach angle, and further, a step is formed in the middle of the leg ( Patent Document 2).
JP-A-6-285811 Utility Model Registration No. 3005271

  However, the prior art only makes the angle of the staple leg tip asymmetric. The direction of approach cannot be controlled effectively only by making it asymmetric. In particular, as the length of the leg portion becomes longer, it becomes more difficult to control the approach direction of driving.

  The present invention eliminates the above-mentioned problems and more effectively controls the approach direction of the staple legs when driving, thereby preventing buckling and ensuring pulling strength. The issue is to provide a hitting machine.

  In order to solve the above-mentioned problem, the invention according to claim 1 is configured such that a driver driven by a striking mechanism provided inside the work tool main body slides on an injection port of a nose portion provided at a lower portion of the tool main body. The staple formed by bending the parallel leg portions from both ends of the crown portion is supplied to the ejection port from the magazine provided at the rear portion of the nose portion, and the staple is removed from the nose portion by the driver. In the nailing machine for staple driving in a downward direction, the inside guide is a groove that is formed on the front wall of the injection port of the nose portion and guides the front portions of both leg portions of the staples supplied into the injection port in the driving direction. It is comprised by the inner guide part of a shape.

  According to a second aspect of the present invention, in the first aspect, the inner guide portion of the inside guide is set to be substantially the same as or above the lower ends of both leg portions of the staple supplied to the ejection port. And

  According to the invention of claim 1, the inside guide is formed in a groove shape that is formed on the front wall of the injection port of the nose portion and guides the front portions of both the leg portions of the staple supplied into the injection port in the driving direction. Therefore, a part of the front side of the leg portion is pushed into the inner guide portion of the inside guide. When the driver strikes the staple during driving, the staple moves downward, but a part of the leg is guided by the inner guide part, so even if a force that bends outward with respect to the leg acts when striking, It cannot be opened or closed. Both legs are driven out in a state guided in the driving direction. The leg is held in a straight state and driven into the driven material. Therefore, it is reliably prevented that both legs are narrowed.

  According to the second aspect of the present invention, the upper ends of the inner guide portions of the inside guide are set to be substantially the same as or above the lower ends of both the leg portions of the staple supplied to the ejection port. The parts are guided so as not to cross each other from the beginning, and it is reliably prevented that both legs are narrowed.

[Embodiment 1]
1 is a side view of one embodiment of a staple nailing machine, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a front view of the main part of the nailing machine, and FIG. Is a cross-sectional view taken along the line BB in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line CC in FIG.

  In the above figure, reference numeral 1 denotes a nailing machine body. A grip 2 is integrally provided at the rear portion of the nailing machine main body 1, and a nose portion 3 is integrally provided below. A magazine 4 for storing staples is disposed behind the nose portion 3.

  A hammering mechanism is provided inside the nailing machine body 1. The striking mechanism accommodates a striking piston 7 integrally coupled with a driver 6 in a striking cylinder 5 so as to be movable up and down, and opens and closes the upper end of the striking cylinder 5 with a main valve 8 and opens the interior of the nail driver main body 1 when opened. The compressed air in the main air chamber 10 formed in the above is supplied into the striking piston 7 to drive the striking piston 7 and the driver 6. Compressed air is supplied to the main air chamber 10 from a compressed air supply source (not shown), and the main valve 8 is controlled to open and close by a trigger valve (not shown) that is operated by operating the trigger lever 11. It has become.

  The magazine 4 stores connected staples formed by adhesively connecting U-shaped staples. The front end of the magazine 4 is opened to the ejection port 13 of the nose portion 3, the connected staple is urged forward by the pusher 12 (see FIG. 4), and the leading staple s is supplied to the ejection port 13 in the nose portion 3. It has come to be.

  With the above configuration, when the trigger lever 11 is pulled, the main valve 8 is opened and the striking piston 7 is driven, and when the driver 6 slides downward in the injection port 13 of the nose portion 3, the leading staple s is removed. It is possible to strike and strike from the lower end of the nose portion 3.

  By the way, the nose portion 3 is constituted by a rear wear plate 14 and a front driver guide unit 15, and an injection port 13 is formed between these two members. The driver guide unit 15 has a contact nose 17 attached to a lower portion of the driver guide 16 so as to be movable up and down, and the contact nose 17 is always biased by a spring so as to protrude downward. The contact nose 17 is also formed with an injection port 13 for the driver 6. An arm (not shown) is attached to the upper part of the contact nose 17, and the upper end of the arm is disposed in the vicinity of the trigger lever 11. When the contact nose 17 is pressed against the workpiece, the arm is pushed against the spring. Thus, the safety device is configured so that the operation of the trigger lever 11 is effective only when it is moved upward relative to the nose portion 3.

  The contact nose 17 is provided with an inside guide 20 for guiding the inner side surfaces of the leg portions 19 in the driving direction at positions corresponding to the positions between the leg portions 19 of the staple s supplied to the ejection port 13. The inside guide 20 is provided so as to be able to rotate back and forth by a shaft pin 21 provided on the front surface portion of the nose portion 3. An opening 22 (see FIGS. 4 and 5) is formed in the front wall of the contact nose 17 so that the inside guide 20 can appear and disappear in the injection port 13 by turning. A spring 23 is disposed between the spring support 27 above the pivotal support 21 of the inside guide 20 and the contact nose 17, and a portion below the pivotal support 21 of the inside guide 20 is always projected from the opening 22 by the spring 23. It is urged in the direction (rearward) to enter the inside of the outlet 13, and the projecting piece 29 is engaged with the opening edge of the opening 22 to restrict the depth of entry.

  In addition, an inner guide portion 24 protrudes from the back surface of the inside guide 20 facing the injection port 13. As shown in FIG. 6, the inner guide portion 24 is formed in a triangular shape having a narrow upper portion 24 a and a lower portion 24 b, and staples s between the lower portion and both side walls 13 a of the injection port 13 of the contact nose 17. A gap having substantially the same width as the leg 19 is formed. When the inner guide portion 24 of the inside guide 20 is biased to enter the injection port 13 by the spring 23, the narrow upper end 25 of the inner guide portion 24 is retracted from the injection port 13 and is 6 is arranged so as not to hit the lower end of 6.

  The inside guide 20 is substantially the same as the lower end of the leg portion 19 of the leading staple s supplied to the nose portion 3 at the upper end 25 of the inner guide portion 24 when the contact nose 17 is pushed and reaches its upper moving end. It is set to be the same or in an upper position.

  According to the above configuration, when the staple s is driven, the tip of the contact nose 17 is pressed against the material P to be driven, so that the contact nose 17 is pressed against the spring 23 and moves upward. At this time, the inside guide 20 also moves upward, and the upper end 25 of the inner guide portion 24 moves to a position substantially the same as the lower end of the leg portion 19 of the leading staple s supplied to the nose portion 3.

  Next, when the trigger mechanism is operated by operating the trigger lever 11, the driver 6 moves downward together with the striking piston 7 to strike the staple s supplied to the nose portion 3, as shown in FIGS. Then push it down. When the staple s moves downward, if one or both of the leg portions 19 are swung outward, the inside of the leg portion 19 is guided along both side walls 13 a of the injection port 13. Further, when one or both of the leg portions 19 are swung inward, the inner tip of the leg portion 19 is guided so as to move along the outer surface 26 of the inner guide portion 24 of the inside guide 20. Therefore, as the leg 19 swung inwardly moves along the inner guide part 24, the leg part 19 is eventually pushed outward and widened to a predetermined width. Finally, the lower part of the inner guide part 24 and the side wall of the injection port 13 Guided through the gap between the two. And finally, this state is maintained, and it is driven out from the injection port 13 and enters the driven material P.

  When the driver 6 passes through the inner guide portion 24, the inner guide portion 24 is pushed out by the driver 6 and rotates against the spring 23 as shown in FIG. For this reason, the inner guide portion 24 is finally retracted from the ejection port 13. At this time, however, the staple s has already been sufficiently driven into the driven material P, so that the approach direction of the leg portion 19 changes. There is no. When the driver 6 moves upward after the driving is finished, the inside guide 20 is again brought into the state shown in FIG. 1 by the spring 23, and the next nail driving is prepared.

  As described above, since the staple s is guided and driven by the side wall 13a of the ejection port 13 and the inner guide portion 24 of the inside guide 20, it is ensured that both the leg portions 19 of the staple s close to each other toward the inner side. To be prevented. Therefore, by effectively controlling the direction in which the staple legs 19 are driven when reliably driven, buckling can be prevented and pulling strength can be ensured.

  Further, at the time of driving, the upper end portion 25 of the inner guide portion 24 of the inside guide 20 moves to substantially the same position as the lower end of the leg portion 19 of the leading staple s supplied to the nose portion 3, so that it actually enters the injection port 13. Even if the portion is slightly lower than that, the upper portion 24a of the inner guide portion 24 is formed narrow, so that there is a gap between the inner side surface of the leg portion 19 of the staple s and the inner guide portion 24 at the time of driving. Therefore, even if the leg portion 19 is slightly swung from side to side, the inner guide portion 24 can reliably catch the leg portion 19, so that the leg portions 19 can be effectively prevented from being narrowed.

  According to the nailing machine, even a staple having a leg portion length of about 50 mm and a length longer by 10 mm than a normal floor construction staple can be reliably driven into the wood without buckling. it can.

  Further, since the inside guide 20 protrudes only slightly in front of the nose portion 3 and is arranged at a relatively upper portion, as shown in FIG. Since the tip of the nose portion 3 can be positioned at the corner between the floor P and the wall 28 in a state where it hits the surface, it is very effective even when cornering. On the other hand, since what was shown in patent document 1 is arrange | positioned in the lower part of the nose part 3 as shown by the code | symbol 20 'in the figure (b), it was not very suitable for cornering.

[Embodiment 2]
FIG. 9 is a cross-sectional view showing another embodiment of a staple driving nail machine in the same cross section as FIG. 7, and FIG. 10 is a cross-sectional view taken along the line DD of FIG.

  In the above figure, the same members as those in Embodiment 1 are denoted by the same reference numerals. The inside guide 20 is constituted by an inner guide portion 24 formed in the shape of two grooves on the front wall 30 of the injection port 13 of the nose portion 3. That is, the inner guide portion 24 is formed forward from the front wall 30 of the ejection port 13 which is a passage of the driver 6 of the contact nose 17 and is fed to the front portion of both legs 19 of the staple s supplied into the ejection port 13. It is a groove-shaped guide part which guides in the driving direction. The inner guide portion 24 gradually becomes deeper from the upper part of the contact nose 17, and the staple s supplied to the ejection port 13 by the pusher 12 at a position relatively pushed upward by pressing the contact nose 17 against the driven material. It is deepest at a position corresponding to the lower end of the leg 19 and is formed so as to be shallow again and be the same as the front wall 30 of the injection port 13 before the lower end of the contact nose 17.

  According to the above configuration, when the contact nose 17 is pressed against the material to be driven and moves upward with respect to the nailing machine body 1, the leading staple s in the magazine 4 is pushed forward by the pusher 12, and its leg portion 19. A part of the front side is pushed into the inner guide portion 24 of the inside guide 20. When the driver 6 strikes the crown portion 18 of the staple s at the time of driving, the staple s moves downward, but a part of the leg portion 19 is guided by the inner guide portion 24. It cannot be opened or closed even if a force that deflects is applied. Both legs 19 are driven out in a state guided in the driving direction. Note that the leg portion 19 of the staple s returns to the injection port 13 immediately before being ejected from the ejection port 13, but at this time, the leg portion 19 is already held in a straight state, so that it is directly driven into the driven material. . Therefore, it is reliably prevented that both the leg portions 19 are narrowed.

  Further, since the inner guide portion 24 of the inside guide 20 is set so as to be substantially the same as or at the upper position of the lower ends of both the leg portions 19 of the staple s supplied to the ejection port 13, the both leg portions 19 are from the beginning. It will guide so that it may not mutually cross, and it is prevented reliably that both the leg parts 19 are narrowed.

Side view of one embodiment of a staple nailing machine Sectional drawing on the AA line of FIG. Front view of the main part of the nailing machine Sectional drawing on the BB line of FIG. Sectional drawing on the CC line of FIG. Cross section of the back side of the driver guide Explanatory drawing of operation mode of inside guide at the time of staple driving (A) and (b) are comparative diagrams for cornering between the nailing machine and the conventional nailing machine, respectively. FIG. 9 is a cross-sectional view showing another embodiment of the staple nailing machine in the same cross section as FIG. 10 is a cross-sectional view taken along the line DD of FIG.

Explanation of symbols

s Staple 1 Tool body 3 Nose part 6 Driver 13 Injection port 19 Leg part 20 Inside guide 24 Inner guide part

Claims (2)

A driver driven by a striking mechanism provided inside the tool body is slidably guided to an injection port of a nose part provided at the lower part of the tool body, and parallel legs are provided from both ends of the crown part. A staple nailing machine that supplies staples formed by bending from a magazine provided at a rear portion of the nose portion to the ejection port, and drives the staples downward from the nose portion by the driver.
The inside guide is formed by a groove-shaped inner guide portion that is formed on the front wall of the injection port of the nose portion and guides the front portions of both the leg portions of the staple supplied into the injection port in the driving direction. A stapling nail machine characterized by being.   The staple nail according to claim 1, wherein the inner guide portion of the inside guide is set to be substantially the same as or above the lower ends of both leg portions of the staple supplied to the ejection port. Hammer.

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