JP5168733B2 - Nailer - Google Patents

Description

  The present invention relates to a nailing machine capable of continuously driving a headless nail having the same nail head diameter as the shaft diameter of the nail, and more particularly to a nailing machine having an improved driver blade shape for hitting a headless nail. .

  Conventionally, a method of attaching a mounting member such as a finishing board of a building interior or a finishing edge, such as a finishing edge, is to attach a finishing nail with a head diameter of 1 to 2 mm having a small nail head after bonding the mounting member with an adhesive. It was common to drive by mounting in a relatively narrow groove provided in the mounting member. However, recently, a method of driving using a headless nail 8 as shown in FIG. 8 is increasing so that the finish after driving can be seen better. In general, the thickness of the shaft of the headless nail 8 is inconspicuous, and the shaft diameter of 0.6 to 0.7 mm, which is about half the conventional shaft diameter, is mainly used to improve the finish. In order to prevent the nail from buckling when a thin headless nail is driven and to enable the nail to be reliably guided, the nail head has a shape of a headless nail having an outer diameter together with the shaft. The headless nails used have an axial diameter of 0.6 to 0.7 mm, and about 100 headless nails are connected in parallel with an adhesive or the like, and the connecting nails are set in a magazine of a nailing machine.

  If this method of driving headless nails 8 is used, when nails 8 are driven, the traces of nails will not be noticeable and the finish will be improved. In recent years, all sorts of things such as window frames, door frames, and stair railings In many cases, headless nails 8 have been used. For this reason, it has become mainstream to use the longer headless nail of 35-45 mm from the headless nail of length 10-25 mm which was the mainstream conventionally. A nailing machine used in this conventional nailing machine is known from Patent Document 1, for example. Since the headless nail 8 is guided in the injection port and can be driven straight into the material to be driven, a substantially square-shaped injection path formed between the contact arm and the guide surface of the guide plate is used as the headless nail 8. Can pass one by one. The headless nail 8 hits the headless nail from above with a tip of a driver blade and strikes it onto a material to be driven such as wood. Here, the tip shape of a conventional driver blade will be described with reference to FIGS.

  FIG. 12 is a view of a tip portion of a driver blade 118 used in a conventional nailing machine. The driver blade 118 is narrowed at the distal end portion 140 as viewed in the longitudinal direction so as not to increase the impact mark on the workpiece after being driven, and to increase the strength of the distal end portion as much as possible. From the front end portion 140 to the parallel outer edge 143, a substantially triangular shape of about 60 ° is formed. Further, in order to ensure the strength of the tip portion (striking portion) 140 and the entire shaft that come into contact with the headless nail 8 and to prevent the headless nail 8 from coming off the injection port and from side to side (width direction), Two concave grooves 141 are formed on both sides in the width direction when viewed from the axis. Furthermore, thick portions 142 are formed on both sides of the concave groove 141 in order to ensure the strength of the driver blade.

JP 2006-26785 A

  In recent years, the impact mark of about 2 mm in width at the tip portion is larger than that of the nail head, and thus there has been a demand for further improving the finish. Further, when the nail head is submerged deeply into the driven material so that the nail is not conspicuous, the triangular tip shape of the driver blade is widened, so the hitting mark is larger than the size of the tip portion 140, and the finish is It was getting worse. For this reason, even if the headless nail is struck deeply, the striking trace will not spread and become inconspicuous, and a straight portion having a width of about 1.5 mm and a length of about 2 mm will be provided at the tip of the driver blade 18 and will rise from there. An improvement has been proposed in which a triangular taper of about 60 ° is formed over the thick portion of the outer edge.

  In the technique of Patent Document 1, when the technique of providing a straight part is applied, the strength near the tip of the driver blade 118 is lowered. Furthermore, there is a demand for using a headless nail 8 whose headless nail 8 is longer than the conventional 35-45 mm, but in order to drive a headless nail having a length of about 60 mm, The driving force of about 1.5 times is required, and when the headless nail 8 is bent or the tip of the driver blade 118 is detached and the nail is clogged, the tip 140 of the driver blade 118 is in the injection path. This contacted a part and caused a problem that the vicinity of the tip of the driver blade 118 was broken. Experimentally, when a long headless nail of about 60 mm is driven by a conventional nailing machine, two locations indicated by arrows 150 in FIG. 12 and two locations indicated by arrows 151 in FIG. It has been found that stress concentrates on a specific portion near the boundary of the thick portion 142, and there is a possibility that the vicinity of the tip of the driver blade 118 may be broken.

  The present invention has been made in view of the above background, and an object thereof is to provide a nailing machine capable of stably driving a long headless nail.

  Another object of the present invention is to provide a nail driver which can improve the strength of a driver blade and can stably drive a connecting nail even if there is a small gap in the injection path.

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

  According to one aspect of the present invention, the impact driving means having a driver blade that strikes a nail, a bit guide that forms a fixed injection path that guides the nail that is impacted by the driver blade, and a fixed and fixed to the bit guide. A magazine that feeds the nail connected to the injection path, and a contact arm that is slidable in the moving direction of the driver blade and that forms a moving injection path for the nail to be injected. In a nail driver that drives a nail while making contact, the driver blade has an elongated flat plate shape, and has a groove on both sides of the central shaft portion in the longitudinal section, and a thick portion on the outer periphery of the groove. Rises so that the thickness gradually changes from the groove to the thick part, and in the longitudinal direction of the driver blade, a straight part is formed near the tip of the central shaft part. It was. The change in thickness from the concave groove to the thick portion may be formed in a stepped shape by the first thick portion and the second thick portion, and the width of the first thick portion and the second thick portion. Are preferably substantially equal, and their width is preferably equal to or greater than the width of the groove.

  According to another feature of the present invention, the straight portion is configured by an inner portion on the side of the central shaft portion from the bottom of the groove formed on both sides of the central shaft portion, and the straight portion has a width of 1 to 2 mm and an axial direction. The length from the thin portion to the thick portion of the outer edge in the axial direction was a taper of 30 ° to 80 °.

  According to another feature of the present invention, the change in thickness from the concave groove to the thick portion is formed in a step shape by the first thick portion, the second thick portion, and the third thick portion. Alternatively, the thickness was continuously increased.

  According to the invention of claim 1, the driver blade is an elongated flat plate having a groove on both sides of the central shaft portion in the longitudinal section, and a thick portion is formed on the outer periphery of the groove, Standing up so that the thickness gradually changes from the concave groove to the thick part, in the longitudinal direction of the driver blade, because a straight part is formed near the tip of the central shaft part, the headless nail is bent, Also, even when the tip of the driver blade comes off from the headless nail and the headless nail is not fully driven and a bending load is applied to the tip, the stress can be distributed almost evenly around the tip of the driver blade. The driver blade can be effectively prevented from being damaged because the stress is not concentrated on a specific portion outside the concave groove portion which is a thin portion.

  According to the second aspect of the present invention, since the change in the thickness is stepped by the first thick portion and the second thick portion, the stepped first thick portion and the second thickness The stress can be distributed as a substantially uniform generated stress over the thick portion, and damage to the driver blade can be effectively prevented by the stress not being concentrated at a specific portion outside the concave groove portion which is a thin portion.

  According to invention of Claim 3, since the width | variety of a 1st thick part and a 2nd thick part is substantially equal, stress does not concentrate on any thick part, but it distributes effectively. be able to.

  According to invention of Claim 4, since the width | variety of a 1st thick part and a 2nd thick part is equal to or larger than the width of the said ditch | groove, stress concentrates on any thick part. It is not hung and can be distributed effectively.

  According to the invention of claim 5, since the straight portion is constituted by the inner portion on the side of the central shaft portion from the bottom portion of the concave groove formed on both sides of the central shaft portion, the strength of the straight portion is prevented from being reduced. The wall thickness can be reduced.

  According to the invention of claim 6, the straight portion has a width of 1 to 2 mm and an axial length of 1 to 3 mm, and in the axial direction, the shape rising from the thin portion to the thick portion of the outer edge is 30 Since it has a taper shape of from 80 ° to 80 °, it is possible to sufficiently reduce the impact mark remaining when the headless nail is driven deeply.

  According to the invention of claim 7, the change in thickness from the concave groove to the thick portion is formed in a step shape by the first thick portion, the second thick portion, and the third thick portion. Therefore, the stress applied to the outside of the groove can be more effectively dispersed.

  According to the eighth aspect of the present invention, since the thickness continuously increases from the concave groove to the thick portion, the stress applied to the outside of the concave groove can be effectively dispersed. .

  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, portions having the same function are denoted by the same reference numerals, and repeated description is omitted. In the present specification, the directions shown in FIG. 1 are defined as the vertical and front-rear directions.

  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 impact driving means is built in the housing 11. The housing 11 is provided so as to project forward from the end portion thereof, and an ejecting portion 26 for ejecting the headless nail 8. The handle 15 is provided orthogonal 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 in front of the bit guide 12 and is supported by the bit guide 12 so as to be slidable up and down. 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. A distal end portion (lower end portion) 51 of the contact arm 5 is provided with an injection path to be described later for guiding the connecting nail to be driven out.

  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 191 of the opposite trigger arm 19 is engaged with the upper end 62 of the connecting arm 6. Provided in contact with the tip of the plunger 4 at substantially the center.

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

  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 connected headless nail, and the feeding member is biased forward (blade guide 12 side) by a spring. On the front side of the nail driver 1, a bit guide 12 fixed to the housing 11 and extending forward is disposed. The bit guide 12 has a feeding path for guiding the connected headless nail, and a front end of the connected headless nail. A fixed injection path 36 for guiding the head nail 8 is formed.

  FIG. 4 is a front view of the injection unit 26. In FIG. 4, an upper guide plate 10 and a lower guide plate 25 are attached to the front side of the injection portion 26, and an injection path of the headless nail 8 is defined by a closed space surrounded by the upper guide plate 10 and the bit guide 12. The Similarly, at the tip 51 of the contact arm 5, the injection path of the nail 8 is defined by the closed space surrounded by the contact arm 5 and the upper guide plate 10. Here, since the lower guide plate 25 is fixed to the contact arm 5, it slides up and down together with the contact arm 5. The feed path in the magazine 2 is provided with a foot receiving portion 27 that guides and supports the lower end of the coupled headless nail, and the lower end of the upper guide plate 10 that forms the front support surface constituting the injection path is the foot receiving portion 27. It is formed so as to be positioned at the same position as that of the footrest portion 27 or below the footrest portion 27.

  The contact arm 5 is always pressed upward (in the direction in which the contact arm 5 approaches the cylinder 20) by a spring (not shown) provided between the bit guide 12 and the spring load is applied to the spring 61 of the plunger 4 (FIG. 1). It is set smaller than the load pressed downward by the pressure applied to the plunger 4. If the trigger 3 is pulled while the contact arm 5 is not in contact with the material to be driven by this load setting (so-called idle driving), the spring pressure applied to the plunger 4 is greater, so the plunger 4 does not move. The contact arm 5 moves downward, and the piston 14 does not strike.

  FIG. 5A is a partial cross-sectional view taken along the line AA in FIG. 4 and shows a cross-sectional shape of the injection path 36. The ejection path 36 includes a front support surface 361 that supports the front side of the headless nail 8 at the top of the stored connected headless nail, and a side support surface 362 that supports the side of the headless nail 8 at the opposite side. Defined by a rear support surface 363. In the AA section, the side support surface 362 and the rear support surface 363 are the side walls and the bottom surface of the groove formed in the blade guide 12, and the front support surface 361 is fixed to the front surface of the blade guide 12 with screws or the like. It is formed by the rear surface of the upper guide plate 10. When the headless nail 8 having a shaft thickness of 0.6 to 0.7 mm is used, the distance between the pair of side support surfaces 362 constituting the injection path 36 (the width direction of the groove) is 0.8 to 1. It is preferable to form it at 0 mm, and the dimension is set so that the headless nail 8 and the backlash are as small as possible. This is because the headless nail 8 has a very thin shaft thickness of 0.6 to 0.7 mm and is easily bent. Further, when the leading headless nail 8 is separated from the connected headless nail by striking the leading headless nail 8 with the driver blade 18 at the time of driving, the struck leading headless nail 8 is placed in the injection path 36. Therefore, buckling is prevented by supporting the side surface of the headless nail 8 with a side support surface 362 that opposes the side surface of the headless nail 8. At this time, the distance between the side support surfaces 362 is 0.8 to 1.0 mm so that the backlash between the headless nails 8 and the side support surfaces 362 is reduced as much as possible and the headless nails 8 can be stored. It was experimentally obtained that The blade guide 12 is further formed on both sides of the injection path with a convex portion 365 for guiding the sliding of the guide blade 18, a shallow groove portion 366, and a deep groove portion 367, from the convex portion 365 to the deep groove portion 367. It is hung and stepped. The convex portion 365 is opposed to the concave portion formed in the driver blade 18.

  FIG. 5B is a partial cross-sectional view taken along the line BB in FIG. 4 and shows a cross-sectional shape of the injection path 37 formed by the contact arm 5. The ejection path 37 includes a front support surface 371 that supports the front side of the headless nail 8 delivered from the ejection path 36 by striking, and a side support surface 372 that supports the side of the headless nail 8 that faces the head. , Defined by a rear support surface 373. In the B-B section, the side support surface 372 and the rear support surface 374 are the side walls and the bottom surface of the groove formed in the contact arm 5, and the front support surface 371 is fixed to the front surface of the contact arm 5 with screws 17 or the like. The upper guide plate 10 is formed by the surface. The distance between the pair of side support surfaces 372 constituting the injection path 37 (in the width direction of the groove) is preferably 0.8 to 1.0 mm having the same dimensions as in FIG. Here, the contact arm 5 is formed with a convex portion 375 for guiding the sliding of the guide blade 18, a shallow groove portion 376, and a deep groove portion 377, and is stepped from the convex portion 375 to the deep groove portion 377. It has become. The convex portion 375 is opposed to the concave portion formed in the driver blade 18.

  FIG. 6 is a partial cross-sectional view taken along the line CC in FIG. 4 and shows a connection structure between the injection unit 26 and the magazine 2. A holding portion 39 is formed on the front side of the magazine cover 21, and the holding portion 39 is provided with an engaging portion 39a having a fixed flat portion that is smoothly connected by a tapered surface, and the guide bar 38 moves forward. As a result, the convex portion 38b of the guide bar 38 comes into contact with the engaging portion 39a of the magazine cover 21, so that the guide bar 38 moves to the right. Thereafter, the convex portion 38b rides on the engaging portion 39a and stops. Thereby, the front end portion 38a of the guide bar 38 is configured to be slidable in the left-right direction and the front-rear direction while maintaining a certain gap with respect to the base surface of the magazine.

  Next, the shape of the driver blade 18 according to the embodiment of the present invention will be described with reference to FIG. FIG. 7 (1) is a view showing a tip portion of the driver blade 18, and (2) is a bottom view thereof. The tip portion of the driver blade 18 has a mountain shape protruding downward, is a center position where the headless nail 8 is hit, and is symmetrical with respect to the center axis 66 which is the center in the longitudinal direction of the driver blade 18. Formed. The guide blade 18 has a concave groove 41 on both sides of the central shaft 66 so as to receive a convex portion 365 (FIG. 5 (1)) and a convex portion 375 (FIG. 5 (2)) that guide the sliding of the driver blade 18. Is formed. Even when the headless nail 8 is clogged, it leads to the thick part (thickness g part) connected to the outer edge through the thin part (thickness h part in FIG. 5) formed by the concave groove 41. The shape is such that the buckling strength of the cross section of the angle shaft is ensured so as to prevent the driver blade 18 from being bent easily due to impact of impact. Further, the tip end in the axial direction of the driver blade 18 includes the central shaft portion 40 and the side wall is cut in the axial direction in the vicinity of the center portion of the concave groove 41. A straight portion was formed so that a = about 1 to 3 mm. Further, in the width direction, a triangular taper is formed from the thin portion near the center of the concave groove 41 to the thick portion 43 on the outer edge, and the taper angle is 70 °. The taper angle is not limited to 70 °, and may be set in the range of 30 ° to 80 °.

  Further, the width (d) of the concave groove 41, the width e of the stepped first thick part 42, and the width f of the second thick part 43 are substantially equal or d ≦ e ≦ f. Set as follows. As a result, the stress generated in each part when the bending load at the tip is applied can be effectively distributed to the outside, and the stress concentrates on the outer part of the recessed groove 41 which is a thin part, so that the driver blade 18 Can solve the problem of damage. In addition, since the lower end of the stepped portion from the concave groove 41 to the first thick portion 42 and the second thick portion 43 is included in the tapered portion, the stress due to impact mainly received in the axial direction is effective. Can be dispersed. Furthermore, in this embodiment, since there are a plurality of steps from the recessed groove 41 to the outer edge 44, it is possible to effectively prevent the driver blade 18 from swinging left and right during injection.

  In this way, by using the shape of FIG. 7, it was possible to increase the strength by about 20 to 30% compared to the driver blade 118 having the same width and thickness. As an effect of forming the first thick portion 42, when the guide bar 38 shown in FIG. 6 is moved to the right side, the tip end portion 38a can be retracted in a hollow portion by the first thick portion 42 of the driver blade. There is also an effect of becoming.

  Next, the driving operation of the nailing machine of FIG. 1 will be described. A magazine 2 is attached to the lower part of the headless nailer body 1, and the connected headless nails loaded in the magazine 2 are fed into the front injection path 36 by a feeding member (not shown). By operating the trigger 3, the piston 14 in the nailing machine body 1 is operated, and the driver blade 18 integrated with the piston 14 moves downward. The driver blade 18 is provided so as to be vertically movable in a space including the injection path 36 and the moving injection path 37, and the driver blade 18 is rapidly lowered by the ON operation of the switch 23, and the headless nail in the injection path 36 is headed. 8 is separated from the connected headless nail and driven into the driven material from the injection port 31.

  First, the operator lightly touches the ejection port 31 of the tip 51 of the contact arm 5 against the surface of the groove 91 of the workpiece 9. Next, the operator performs a pulling operation of the trigger 3 to activate the nailing machine body 1. By pulling the trigger 3, the trigger 3 is rotated to the switch 23 side. As a result, the pivot portion 24 of the trigger arm 19 moves upward, so that the central portion of the trigger arm 19 abuts against the tip of the plunger 4 of the switch 23. As a result, the distal end of the plunger 4 serves as a fulcrum, and the end of the trigger arm 19 pushes down the upper end 61 of the connecting arm 6 with the pivot 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 61 is prevented from descending. Since the connecting arm 6 does not move downward due to this lowering prevention, the plunger 4 is pushed up by the central portion of the trigger arm 19 in accordance with the pulling operation of the trigger 3, the switch 23 is turned on, and the nail driver body 1 starts its operation. .

  By this operation, the driver blade 18 is rapidly lowered, the headless nail 8 in the injection path 36 is separated from the connected headless nail, guided and supported by the moving injection path 37 in the contact arm tip 51, and from the injection port 31. It is driven into the workpiece 9.

  In the nailing machine 1 according to the present embodiment, as described above, the switch 23 is turned on while the injection port 31 positioned at the lower end of the moving injection path 37 is always in contact with the driven material 9. Therefore, it is possible to prevent a problem that the headless nail 8 is bent and driven or the tip of the driver blade 18 is detached from the headless nail 8 and the driving of the headless nail 8 is incomplete. Further, even if the nail driver main body 1 is lifted due to a reaction during driving, the moving injection path 37 is not fixed to the nail driver main body 1, so that the injection port 31 and the driven material 9 are in contact with each other. The headless nail 8 can be bent, or the tip of the driver blade 18 can be detached from the headless nail 8 to prevent the incomplete driving of the headless nail 8.

  Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a bottom view of the driver blade according to the second embodiment of the present invention.

  FIG. 9 is a bottom view of the driver blade 18a according to the second embodiment of the present invention. In the second embodiment, the two concave grooves 71 are formed on both sides of the hitting shaft portion 70 in the same manner as in the first embodiment, but up to the thickest third thick portion 74. The first thick portion 72 and the second thick portion 73 are formed between the two steps. In such a shape, since the degree of change in the thickness is less than that in the first embodiment in each step portion where the thickness of the outside of the concave groove 71 changes, the specific step portion is formed at the time of hitting or nail clogging. Since the concentration of stress can be reduced and the stress can be effectively distributed to each step portion, damage near the tip of the driver blade 18c can be prevented.

  FIG. 10 is a bottom view of the driver blade 18b according to the third embodiment of the present invention. In the second embodiment, the two concave grooves 81 are formed on both sides of the hitting shaft portion 80 in the same manner as in the first embodiment, but from the both sides of the concave groove 81 to the first thick portion 83. A slope portion 82 is formed, and a second thick portion 84 is formed outside the first thick portion 83. In such a shape, since the outside of the groove 81 is connected to the first thick portion 83 by the slope portion 82, the degree of change in the thickness at this portion is gradual. Since the concentration of stress can be effectively dispersed, damage near the tip of the driver blade 18b can be prevented.

  FIG. 11 is a bottom view of a driver blade 18c according to the fourth embodiment of the present invention. In the third embodiment, the two recessed grooves 91 are formed on both sides of the hitting shaft portion 90 in the same manner as in the first embodiment, but from both sides of the recessed groove 91 to the first thick portion 93. They are connected by a gentle slope 92. In such a shape, there is no portion where the thickness at which stress tends to concentrate rapidly changes outside the concave groove 91, so that stress can be prevented from concentrating on a specific location at the time of hitting or clogging with a nail, Damage to the vicinity of the tip of the driver blade 18c can be prevented.

  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, as a power source of the nailing machine of the present invention, not only compressed air but also various things such as electricity or gas can be used.

It is a side view of the nail driver which concerns on embodiment of this invention, and shows a cross section in part. It is a side view from the opposite side to Drawing 1 of a nailing machine concerning an embodiment of the present invention. It is a fragmentary sectional view of the attachment part of the injection part 26 and magazine 2 of FIG. It is the front view which looked at the injection | emission part 26 of FIG. 1 from the front. (1) is a partial cross-sectional view taken along the line AA in FIG. 4 and shows a cross-sectional shape of the injection path 36, and (2) is a partial cross-sectional view taken along the line BB in FIG. FIG. 6 is a view showing a cross-sectional shape of a path 37. FIG. 5 is a partial cross-sectional view taken along a line CC in FIG. 4 and shows a structure of an injection unit 26 and a magazine 2. It is a figure which shows the front-end | tip shape of the driver blade 18 concerning embodiment of this invention, (1) is a rear view of a front-end | tip part, (2) is a bottom view. 3 is a perspective view showing a shape of a headless nail 8. FIG. It is a bottom view of a driver blade concerning a 2nd embodiment of the present invention. It is a bottom view of a driver blade concerning a 3rd embodiment of the present invention. It is a bottom view of a driver blade concerning a 4th embodiment of the present invention. It is a rear view of the front-end | tip part of the driver blade used for the nailing machine of a prior art example. It is a bottom view of a driver blade used for a conventional nailing machine.

Explanation of symbols

1 Nailer 2 Magazine 3 Trigger 4 Plunger 5 Contact Arm 6 Linking Arm 8 Headless Nails
10 Upper guide plate 11 Housing 12 Bit guide 13 Feed member 14 Piston 15 Handle 16, 17 Bolt 18 Driver blade
19 Trigger arm 20 Cylinder 21 Magazine cover
22 Rotating shaft 23 Switch 24 Pivot portion 25 Lower guide plate 26 Injection portion 27 Foot receiving portion 31 Injection port 36 Fixed injection passage 37 Moving injection passage 38 Guide bar 38a (guide bar) tip 38b (guide bar) convex Part 39 holding part 39a engaging part 40 tip part 41 concave groove 42 first thick part 43 second thick part 44 outer edge 51 (contact arm) tip part 52 (connecting arm) upper end part 61 spring 62 (connecting arm) Top)
70, 80, 90 Strike shaft 71, 81, 91 Concave groove
72 1st thick part 73 2nd thick part 74 3rd thick part 75, 85, 94 outer edge 82, 92 slope part 83 1st thick part 84 2nd thick part 93 1st thick part 118 driver blade 140 Tip portion 141 Concave groove 142 Thick portion 143 Outer edge 361, 371 Front support surface 362, 372 Side support surface 363, 673 Back guide surface 365, 375 Protrusion portion 366, 376 Shallow groove portion 367, 377 Deep groove portion

Claims (8)

A striking drive means having a driver blade for striking a nail;
A bit guide that forms a fixed injection path for guiding the nail hit by the driver blade;
A magazine for feeding the nail fixed to the bit guide and connected to the fixed injection path;
A nail driver that has a contact arm that is slidable in the moving direction of the driver blade and that forms a moving injection path for the nail to be injected, and that drives the nail while the contact arm is in contact with a material to be driven. In the machine
The driver blade has an elongated flat plate shape, and has a groove on both sides of the central shaft portion in a longitudinal section, and a thick portion is formed on the outer peripheral portion of the groove, and the thickness is increased from the groove. Stand up so that the thickness gradually changes over the part,
A nailing machine, wherein a straight portion is formed in the vicinity of a tip of a central shaft portion in a longitudinal direction of the driver blade.   The nailing machine according to claim 1, wherein a change in thickness from the concave groove to the thick portion is formed in a stepped shape by the first thick portion and the second thick portion. .   The nailing machine according to claim 2, wherein widths of the first thick part and the second thick part are substantially equal.   The nailing machine according to claim 3, wherein the width of the first thick part and the second thick part is equal to or larger than the width of the concave groove.   The nailing machine according to claim 1, wherein the straight portion is configured by an inner portion on the side of the central shaft portion from a bottom portion of a concave groove formed on both sides of the central shaft portion. The straight portion has a width of 1 to 2 mm and an axial length of 1 to 3 mm.
The nailing machine according to claim 5, wherein in the axial direction, the shape rising from the thin portion and extending to the thick portion of the outer edge is a taper of 30 ° to 80 °.   The change in thickness from the concave groove to the thick portion is formed in a step shape by the first thick portion, the second thick portion, and the third thick portion. The nailing machine according to 1.   The nailing machine according to claim 1, wherein the change in thickness from the concave groove to the thick portion increases the thickness continuously.

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