JP4533867B2 - Nailer - Google Patents

Description

  The present invention relates to a nailing machine for joining metal fittings for driving nails through, for example, a hole of a joining metal fitting, and to a nailing machine that can be accurately driven into a driving position.

  Various types of nailing machines for metal fittings have been proposed. As one type, the tip of the leading nail to be pushed out protrudes from the tip of the injection port at the tip of the injection unit. When the tip is always located above the injection port and the safety drop that is pushed down by the trigger operation is prevented, the start switch There is a nailing machine that starts the nail driving operation by turning on the power, which is disclosed in, for example, Japanese Utility Model Publication No. 6-47665.

In this nailing machine, in order to prevent the activation switch from turning on when safety is pushed down by a predetermined amount or more, an operating part and an operating part are provided in the trigger, and when the safety is prevented from being lowered, the operating part pushes the plunger. The rotation locus of the operation unit is changed so as to push up.
Japanese Utility Model Publication No. 6-47665

  Due to the presence of the actuating part and the operating part, it is difficult to lengthen the safety travel distance, that is, the stroke, and the tip of the safety cannot necessarily be positioned much above the injection port. For this reason, the visibility of the tip of the nail is lowered, and there is a problem that it is difficult to accurately drive the nail at the driving position. In addition, since the operating and operating parts provided in the narrow trigger move in a complex manner against each spring, there is a risk of malfunction due to slight dimensional deviation, frictional wear, dust adhesion, etc. There was also a problem with reliability.

  An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, improve the visibility of the nail tip, and eliminate the risk of malfunction by adopting a simple configuration, thereby improving the reliability.

  The purpose of the above is to provide a trigger arm pivotally supported in the trigger at its tip and center at positions where it engages with the safety top and the plunger tip of the start switch, respectively, and the center that contacts the plunger tip when the trigger is turned. The trigger arm is pivoted with the fulcrum as the fulcrum and the pivot as the force point, the safety is pushed down by the tip of the trigger arm, and when the downward movement of the safety is prevented, the trigger is triggered with the contact between the tip of the trigger arm and the safety top This is accomplished by turning the arm to push up the plunger and turn on the activation switch.

  According to the present invention, the safety stroke can be lengthened, and the nail tip in the initial state is separated from the safety lower end, so that the nail tip can be easily recognized and easily set in the metal fitting hole. That is, the driving position can be set accurately.

  In addition, since only the trigger arm is provided in the trigger and the safety has a simple configuration including the upper safety, the cam member, and the lower safety, the operation reliability is high.

  The present invention will be described below with reference to FIGS. 1 to 13 showing an embodiment. The nailing machine body 1 includes an injection part 5 in which the leading nail 4 is driven, a magazine 6 that houses the connecting nail 3 and sends the connecting nail 3 to the injection part 5, and a leading nail 4 in the injection part 5 by reciprocating movement. It is composed of a power unit 8 having a built-in blade 7 and the like. The power unit 8 includes a handle 9 for holding the nail driver main body 1 and an activation switch 10 for controlling the driving operation of the main body 1. In the vicinity of the activation switch 10, a trigger 11 that is pulled by a finger of the hand holding the handle portion 9 and an upper end portion 12 a of the reciprocating safety 12 are provided and positioned. The lower end portion 12b of the safety 12 is provided in the vicinity of the injection port 5a that is the launch port of the leading nail 4 of the injection unit 5, and the safety 12 is guided by the nose 13 that constitutes the injection unit 5, and the bottom dead center and the top dead center It is supported so that it can reciprocate between them.

  As shown in FIG. 2, the connecting nail 3 is formed by arranging nails 4 on a plane at regular intervals and connected by a connecting band 3a or the like. The nail 4 has a circular head 4a at the upper end, and the body 4b is a cylinder. The shape and the tip portion 4c are the most representative shapes with acute angles.

  The connecting nail 3 is housed in the magazine portion 6, and the feeder 14 that receives the pressure of the feeder spring feeds the leading nail 4 to the injection portion 5 formed by the nose 13. As shown in FIG. 1, the leading nail 4 in the injection portion 5 has a nail tip portion 4c protruding downward from the injection port 5a so that the position of the nail tip portion 4c can be easily seen. In the vicinity of the nail tip 4c in the injection port 5a, a safety 12 supported so as to be able to reciprocate in parallel with the reciprocating direction of the blade 7 is provided as shown in FIG. The safety 12 is always pressed by the spring 15 toward the top dead center, and the lower end 12b is positioned at a position where the lower end 12b is retracted upward from the nail tip 4c.

  The trigger 11 is pivotally supported so that the rotation operation is possible with the rotation shaft 16 as a fulcrum. An activation switch 10 for controlling the operation of the nailing machine main body 1 is provided in the vicinity of the trigger 11. As is well known, the activation switch 10 is protruded downward and supported so as to be reciprocally movable in the vertical direction. There is a plunger 17 formed. When the plunger 17 is at the bottom dead center, the nail driver main body 1 is kept in the non-activated state, and the activation switch 10 is turned on in the process in which the plunger 17 moves from the bottom dead center to the top dead center. Start driving operation.

  The trigger 11 is provided with a trigger arm 19 pivotally supported by a pivot 18 provided at one end of the trigger 11, and the distal end portion 19 a of the trigger arm 19 is engaged with the upper end portion 12 a of the safety 12 and substantially at the center. The portion is provided at a position to engage with the tip of the plunger 17 of the activation switch 10.

  The safety 12 includes an upper safety 20 on the trigger 11 side, a cam member 21 and a lower safety 22 on the injection port 5a side. The cam member 21 is pivotally supported on a pivot 20a provided at the lower portion of the upper safety 20, and the cam member The lower end of 21 is fitted in a fitting recess 22 a provided above the lower safety 22. The lower safety 22 is guided by pins 23 and 24 provided on the nose 13 and is supported so as to be movable in parallel with the reciprocating direction of the blade 7. The fitting recess 22a of the lower safety 22 is formed such that the upper surface 22b travels from the lower surface 22c. Guide convex portions 21 b are arranged symmetrically on both side surfaces of the cam member 21, and the guide convex portions 21 b are fitted into guide grooves 5 b provided on the side surfaces of the injection portion 5. As shown in FIGS. 1 and 12, the guide groove 5 b is formed obliquely so that the cam member 21 is separated from the lower safety 22 when the guide protrusion 21 b moves downward.

  Next, the operation of the nailing machine of the present invention will be described. The nail tip 4c in the injection port 5a protruding from the injection port 5a is directly set in the bonding metal hole 2a so as to nail the connection metal fitting 2. Next, the trigger 11 is pulled to activate the nailing machine body 1. By pulling the trigger 11, the trigger 11 rotates about the rotation shaft 16 toward the activation switch 10. As a result, the pivot portion 18 of the trigger arm 19 moves upward, so that the substantially central portion of the trigger arm 19 comes into contact with the tip of the plunger 17 of the activation switch 10. As a result, the tip of the plunger 17 serves as a fulcrum, and the pivot 18 serves as a power point, and the trigger arm tip 19a pushes down the safety upper end 12a. However, as shown in FIG. 9, the safety lower end 12 b has the surface 2 b of the joint 2, so that the safety 12 is prevented from descending. Since the safety upper end portion 12a is not lowered by the lowering prevention, the plunger 17 is pushed up by the substantially central portion of the trigger arm 19 in accordance with the pulling operation of the trigger 11, the activation switch 10 is turned on, and the nailer body 1 operates. Starting, the leading nail 4 in the injection part 5 is driven out.

  The above describes the case where the trigger 11 pulling operation is performed after the nail tip 4c protruding from the injection port 5a is set in the metal fitting hole 2a. In this case, the nail tip 4c protrudes from the injection port 5a. The nail tip 4c can be easily set in the metal fitting hole 2a.

  Next, the operation when the leading nail 4 is not set in the metal fitting hole 2a, that is, when there is no material to be driven near the injection port 5a will be described.

  When the trigger 11 is pulled, the pivot portion 18 of the trigger arm 19 moves as described above, so that the central portion of the trigger arm 19 comes into contact with the distal end portion of the plunger 17. Accordingly, the tip of the plunger 17 serves as a fulcrum, the pivot 18 serves as a force point, and the trigger arm tip 19a pushes the safety upper end 12a downward, and the safety 12 resists the spring 15 from the top dead center to the bottom dead center position. Moving. As a result, the plunger 17 remains at the bottom dead center, and the activation switch 10 is not turned on.

  In the process of movement from the top dead center to the bottom dead center of the safety 12, the cam member 21 pivotally supported by the pivot 20a of the upper safety 20 moves downward together with the upper safety 20, but the two guide protrusions provided on the side surface Since the portion 21b is fitted in the guide groove 5b provided on the outer side of the injection portion 5, the cam member 21 moves away from the lower safety 22 along the guide groove 5b as it moves downward, that is, the cam member 21. Rotate about the pivot 20a so that the lower end 21a of the upper part is disengaged from the lower safety fitting recess 22a. When the safety 12 descends to near the bottom dead center, the lower end 21a of the cam member 21 is disengaged from the lower surface 22c of the lower safety fitting recess 22a as shown in FIG. 11, and is locked only on the upper surface 22b. In this state, since the spring 25 is present, the lower end 21a of the cam member is always in contact with the upper surface 22b. FIG. 13 shows that the safety 12 is at the bottom dead center position. From this state, the safety lower end portion 12b that has traveled from the nail tip portion 4c of the injection unit inner nail 4 has been pushed up against the material to be driven. However, only the lower safety 22 moves upward against the spring 25, and the cam member 21 and the upper safety 20 do not move. Therefore, since the trigger arm 19 is not pushed up, the activation switch 10 is not turned ON.

  In the nailing machine according to the above-described embodiment, only the trigger arm 19 pivotally supported by the trigger 11 is provided in the trigger 11, and when the movement to the bottom dead center side of the safety 12 is not prevented, the plunger 17 Since the trigger arm tip 19a has a structure that pushes the safety upper end 12a to the bottom dead center side with the tip as a fulcrum, the movement distance from the top dead center to the bottom dead center of the safety 12, that is, the stroke can be increased. The safety lower end 12b can be positioned further upward, the visibility of the nail tip 4c can be improved, and the driving position can be set more accurately. Further, since the trigger arm 19 is rotated with the tip of the plunger 17 as a fulcrum, the force to push down the safety 12 can be increased, and the following operational effects can be obtained. That is, even if dust or the like adheres to the upper safety 20, the lower safety 22, the cam member 21, etc., and the safety 20, 22 becomes difficult to descend, it can be lowered and the reliability can be improved. Further, if the weight of the safety 20 or 22 is increased to increase the rigidity or due to the extension of the length, the load of the spring 15 that holds the safety 20 or 22 at the top dead center position increases. 22 can be reliably lowered.

  FIGS. 14 to 16 are diagrams for explaining the principle showing another embodiment of a separation mechanism for separating the upper safety 200 and the lower safety 220. A connecting body 30 that slidably engages holes 200e and 220e provided in the upper safety 200 and the lower safety 220 to connect the safety 200 and 220, a pin 31 provided at an inner end of the connecting body 30, and an injection unit 5 is formed so as to incline inward as it goes downward, and is constituted by an inclined groove 5e with which the pin 31 engages.

  As shown in FIG. 14, the safetys 200 and 220 are connected by the connecting body 30 and move up and down together. When the lowering of the lower safety 220 is not prevented and the safetys 200 and 220 are lowered by a predetermined amount or more, the pin 31 slides inward along the inclined groove 5e, so that the connecting body 30 is detached from the hole 220e of the lower safety 220 (FIG. 15). ). As a result, there is no fear that the nailing machine main body 1 starts to operate, and even if the lower safety 220 is pushed up for some reason after that, only the lower safety 220 moves up and down (FIG. 16). The main body 1 does not start operation.

The fragmentary sectional view which shows one Embodiment of this invention nailing machine. The front view which shows an example of the connection nail used with this invention nailer. The expanded sectional view which shows the principal part of FIG. Side view showing the safety area of Fig. 1 The side view which shows an example of the cam member of FIG. The side view of FIG. The rear view of FIG. AA line sectional view of Drawing 5. The expanded sectional view which shows the state which set the nail front-end | tip part to the metal fitting hole, and pulled the trigger. FIG. 6 is an enlarged cross-sectional view showing a state in which the nail driver main body is activated and the nail is driven from FIG. Enlarged sectional view showing the state where safety is lowered to the bottom dead center by operating the trigger in the absence of the workpiece The side view of FIG. The fragmentary sectional view which shows the state which only the lower safety raised from the state of FIG. The side view for principle explanation which shows other embodiments of the separation mechanism which constitutes the nailing machine of the present invention. FIG. 15 is a side view showing a state where safety is lowered from the state of FIG. 14. The side view which shows the state which only the lower safety raised from the state of FIG.

Explanation of symbols

1 is a nailing machine body, 3 is a connecting nail, 4 is a nail, 5 is an injection part, 10 is a start switch, 11 is a trigger, 12 is a safety, 21a is a guide groove, 17 is a plunger, 19 is a trigger arm, 20 Is the upper safety, 21 is the cam member, and 22 is the lower safety.

Claims (2)

A nailing machine main body and a lower part of the nailing machine main body, which guides the reciprocating movement of the blade, and moves in the first direction and the second direction facing each other, with an injection part having an injection port at the tip where the nail is driven out. A blade that is supported by the nailing machine body and is driven in the second direction when driving the nail fed into the injection unit, and a plunger that is always pressed downward, and drives the blade. A trigger switch rotatably supported by the nailing machine main body, and a trigger that is housed in the trigger and located between the plunger of the trigger switch and the free operation end of the trigger. a trigger arm which is rotatably accommodated supported, an upper safety which is adapted to be in contact with the free end of the trigger arm, and a lower safety located in the vicinity of the injection portion, said upper safety and lower Sefute A safety mechanism having a connecting means for connecting to a nailing machine equipped with a spring that urges the safety mechanism in the first direction,
The trigger arm tip and center are provided at positions to engage with the upper end of the upper safety and the plunger tip, respectively, and the trigger arm tip when the trigger is rotated when there is no material to be driven near the injection port by but depressing the upper portion of the upper safety on the exit port side, the trigger arm, a central portion of the trigger arm pivots fulcrum central portion of the trigger arm that contacts the plunger of the electromotive Dosu switch is not pushed up plunger In this way, the start switch is not turned ON, and when there is a material to be driven in the vicinity of the injection port, when the trigger is turned, the upper end of the upper safety is pushed down to the injection port side by the trigger arm tip. By being blocked by the material, the trigger arm has a fulcrum at the tip of the trigger arm that contacts the upper end of the upper safety. Nailer, characterized in that so as to turn ON the electromotive Dosu switch pushing up the plunger by the central portion of the trigger arm pivots. Wherein when the amount of movement of the the second direction of the safety mechanism is more than a predetermined amount, the nailer of claim 1, wherein in that a means away Ri away to cut off the top safety and lower safety.

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