JP2011115903A - Driving machine - Google Patents

Abstract

A driving machine capable of easily adjusting the driving depth of a nail is provided.
A driving machine 1 includes a braking unit 320 that brakes a nail 2 by colliding with a nail 2 at the time of lowering at an injection direction end of a nose unit 300. In addition, the braking unit 320 includes a braking member 321 that is biased by a spring 323 in a direction in which an end thereof is directed toward the central axis of the injection passage 311. When the workpiece 3 is soft, the operator operates the knob 325 so that the end of the braking member 321 enters the injection passage 311. The end of the braking member 321 collides with the nail head of the nail 2 that is pressed down by the driver blade 130 and moves in a direction away from the central axis of the injection passage 311 against the urging force of the spring 323. Accordingly, the driving energy of the nail 2 is reduced, and it is possible to prevent the nail 2 from being embedded.
[Selection] Figure 1

Description

  The present invention relates to a driving machine for controlling a driving depth of a stopper such as a nail or a staple driven by the driving machine.

  Conventionally, in order to drive the nail into the driven material so that the head of the nail driven by the nail driver and the surface of the member into which the nail is driven (hereinafter referred to as “the driven material”) are flush with each other A method of adjusting the distance between the tip of the push lever that contacts the workpiece and the tip at the bottom dead center of the driver blade from which the nail is ejected, that is, the distance between the workpiece and the driver blade is well known. For example, in the driving depth adjusting device for a driving machine disclosed in Patent Document 1, the portion of the push lever that abuts against the driving machine main body is screwed to the main body with a screw. Then, the operator moves the knob in which the screw is stored in the axial direction of the screw to adjust the position of the top dead center of the push lever. Thus, the distance between the tip of the push lever and the tip of the driver blade at the bottom dead center is adjusted.

JP 2003-136429 A

  However, with the adjusting device described in Patent Document 1, it is difficult to cope with variations in nail driving depth caused by variations in hardness of the material to be driven.

  The present invention has been made in view of such problems, and an object thereof is to provide a driving machine capable of easily adjusting the driving depth of a nail.

In order to achieve the above object, a driving machine according to the first aspect of the present invention includes:
A driver blade that strikes the stop;
A slidably guiding the driver blade, and a nose portion formed with an injection passage through which the stopper is supplied and injected;
A braking member provided at an end of the injection passage in the injection direction and configured to brake the stopper that is hit by the driver blade and moves in the injection passage;
A biasing member that biases the end of the braking member in a direction toward the central axis of the injection passage;
The end portion of the braking member is bent in a direction toward the central axis of the injection passage.

  The end portion of the braking member may be movable between a first position that interferes with the stopper and a second position that does not interfere with the stopper.

A guide portion provided at an end portion in the injection direction of the nose portion;
An injection hole defined by a tip of the injection passage in the injection direction by the end portion and the guide portion of the braking member, and the stopper is injected;
The diameter of the injection hole when the end of the braking member is located at the first position is 71 of the diameter of the injection hole when the end of the braking member is located at the second position. It may be -74%.

  ADVANTAGE OF THE INVENTION According to this invention, the driving machine which can adjust the driving depth of a nail easily can be provided.

It is sectional drawing in the braking state of the nailing machine which concerns on embodiment of this invention. (A) And (b) is an expanded sectional view of the brake part before and after passage of the nail head in the braking state. (A) And (b) is a figure for demonstrating the state of the injection hole in a braking state and a non-braking state. It is a perspective view of a braking member concerning an embodiment of the present invention. It is sectional drawing in the non-braking state of the nail driver which concerns on embodiment of this invention. It is an expanded sectional view of a brake part in a non-braking state.

  Hereinafter, a driving machine according to an embodiment of the present invention will be described with reference to the drawings. A nail driver 1 which is a driving machine shown in FIG. 1 is a tool for driving a nail 2 which is a stopper, and compressed air is used as its power. For clarity of explanation, in this embodiment, the direction in which the nail 2 is driven out from the nail driver 1 is defined as the injection direction, the injection direction is referred to as the downward direction, and the opposite direction is referred to as the upward direction.

  As shown in FIG. 1, the nail driver 1 includes a main body (housing) 100, a handle part 200 extending in a direction substantially orthogonal to the injection direction, and a nose part 300 positioned at the lower end of the main body 100. Is provided. In order to accumulate compressed air from a compressor (not shown), a pressure accumulating chamber 400 is formed in the handle portion 200 and the main body 100 of the nailing machine 1. The pressure accumulating chamber 400 is connected to the compressor via an air hose (not shown).

  The main body 100 includes a cylindrical cylinder 110, a piston 120 that can slide up and down (reciprocate) in the cylinder 110, and a driver blade 130 that is formed integrally with the piston 120.

  The cylinder 110 slidably supports the piston 120 on the inner surface. A return air chamber 140 for storing compressed air for returning the driver blade 130 to the top dead center is formed on the outer periphery of the lower end of the cylinder 110. A check valve 111 is provided in the center of the cylinder 110 in the axial direction, and an air passage 112 that allows inflow of compressed air from the inside of the cylinder 110 to the return air chamber 140 outside the cylinder 110 is formed. . An air passage 113 that is always open to the return air chamber 140 is formed below the cylinder 110. A piston bumper 150 is provided at the lower end of the cylinder 110 to absorb the surplus energy of the piston 120 after the nail is driven.

  The handle part 200 is a part held by an operator. At the connection portion of the handle portion 200 with the main body 100, a trigger 210 operated by an operator, an arm plate 220 rotatably attached to the trigger 210, and a protrusion from the lower end of the nose portion 300 to the vicinity of the arm plate 220. A push lever 230 that is extended from the main body 100 toward the nose portion 300 and is movable along the nose portion 300, and a trigger valve portion 240 that is a switching valve that communicates with a main valve 160 described later to send and discharge compressed air. And a plunger 250 that transmits the operation of the arm plate 220 to the trigger valve unit 240.

  As is well known, when both the pulling operation of the trigger 210 and the pressing operation of the push lever 230 against the driven material 3 are performed, the plunger of the trigger valve unit 240 is linked by the link mechanism of the arm plate 220 and the trigger 210. 250 is configured to be pushed up.

  A main valve 160, a main valve chamber 161 that houses the main valve 160, a main valve spring 162 that biases the main valve 160 toward the bottom dead center, and a cylinder 110 are installed on the outer periphery of the cylinder 110. And an exhaust bar 163 that shuts off the air passage 164 for exhausting the compressed air in the upper chamber of the piston of the cylinder 110 by contact with the main valve 160. The air passage 164 communicates with the atmosphere through an exhaust hole (not shown) provided in the upper part of the main body 100.

  The nose portion 300 is fixed to the lower end of the main body 100 with a bolt (not shown), and includes a guide portion 310 that extends in a direction parallel to the sliding direction of the driver blade 130. A magazine device 500 is provided on the side of the guide section 310 where a substantially U-shaped section of the injection passage 311 (described later) is open (the right side in FIG. 1). It has been. In addition, a braking portion 320 that brakes the nail is provided at the end of the nose portion 300 opposite to the end fixed to the main body 100.

  The guide unit 310 guides the nail 2 supplied from the magazine 510 so as to be driven perpendicular to the workpiece 3. Inside the guide part 310, the driver blade 130 slides, and an injection passage 311 through which the nail 2 is supplied from a magazine 510 described later is formed. As shown in FIGS. 3A and 3B, the injection passage 311 has a substantially U-shaped cross section perpendicular to the injection direction of the driver blade 130. The injection passage 311 is configured such that the substantially U-shaped opening opens toward the magazine 510 (see FIG. 1). Further, the guide portion 310 is a front end portion in the injection direction and has a substantially U-shaped opening, as shown in FIGS. 3A and 3B, a contact surface 313 a that contacts a braking member 321 described later. 313b. Moreover, the guide part 310 has the injection hole 312 in which the nail 2 is inject | emitted in the injection | emission direction front-end | tip part of the injection path 311 as shown in FIG. In addition, a contact member 330 that is connected to the push lever 230 and that can contact the workpiece 3 is provided around the injection hole 312.

  The brake unit 320 cooperates with the guide unit 310 to guide the nail 2 supplied from the magazine 510 so as to be driven vertically with respect to the material 3 to be driven, and based on the operation by the operator, It performs braking. For example, as shown in an enlarged view in FIGS. 2A and 2B, the braking unit 320 includes a braking member 321, a rotating shaft unit 322, a spring 323, and a cam 324.

  The braking member 321 is a member that changes the amount of movement in the direction toward the central axis of the injection passage 311 corresponding to the surface of the cam 324 that abuts. The braking member 321 can be positioned at a position where braking is performed by contacting the nail head 2a of the nail 2 being lowered and a position where the braking member 321 is not in contact with the nail head 2a being lowered. Hereinafter, a state where the braking member 321 is in the former position is referred to as a “braking state”, and a state where the braking member 321 is in the latter position is referred to as a “non-braking state”. Specifically, as shown in FIGS. 2 and 4, the braking member 321 includes a contact portion 321 a that contacts and brakes the nail 2, and an operation portion 321 b that contacts the spring 323 and the cam 324. The rotation shaft portion 322 is integrally formed so as to have a substantially L shape with the bent portion. As shown in FIG. 1, the braking member 321 is pivotally supported by a rotation shaft portion 322 and provided at a position facing a substantially U-shaped opening portion of the guide portion 310. The rotating shaft portion 322 is provided in the magazine 510, and the rotating shaft has an injection direction and a substantially U-shaped opening direction (a direction opposite to the direction in which the nail is fed to the injection passage 311). It extends in a substantially orthogonal direction.

  As shown in FIGS. 2A and 2B, the contact portion 321a of the braking member 321 is downward from the bent portion of the substantially L-shaped braking member 321 in the braking state, that is, to the guide portion 310. The end portion is bent in a direction toward the center axis of the injection passage 311. Moreover, as shown in FIG. 4, the contact part 321a has the braking surface 321c in the surface which faces the upper side of the edge part. The braking surface 321c contacts the nail head 2a in the braking state, and brakes the nail 2. Moreover, the contact part 321a has the guide surface 321d extended along an injection | emission direction in the edge part.

  As shown in FIGS. 2A and 2B, the guide surface 321 d, which is a surface facing the guide portion 310, cooperates with the guide portion 310 to define the injection hole 312, so that the abutting portion 321 a is formed. It is formed in the edge part. FIG. 3A is a diagram showing the position of the contact portion 321a in the braking state as viewed from the direction along the line AA in FIG. FIG. 3B is a diagram showing the position of the contact portion 321a in the non-braking state as seen from the direction along line BB in FIG. The abutting part 321a has to-be-contacted surfaces 321e and 321f at positions facing the contacting surfaces 313a and 313b. As shown in FIG. 3A, the to-be-contacted surfaces 321e and 321f are in contact with the contacting surfaces 313a and 313b in the braking state. Further, the contact surfaces 321e and 321f are separated from the contact surfaces 313a and 313b in the non-braking state, as shown in FIG. 3B. In the braking state, the cross-sectional area (diameter) of the injection hole 312 defined by the guide surface 321d of the braking member 321 and the guide portion 310 is smaller than the cross-sectional area (diameter) of the nail head 2a. In the non-braking state, the cross-sectional area (diameter) of the injection hole 312 defined by the guide surface 321d of the brake member 321 and the guide portion 310 is larger than the cross-sectional areas (diameters) of the nail head 2a and the driver blade 130. large.

  Here, the distance relationship between the guide surface 321d and the nail head 2a in the braking state will be described with reference to FIG. For example, when driving a nail 2 (head diameter D = 6.8 mm, shaft diameter d = 2.9 mm) having the largest head diameter among the nails that can be driven by the nail driver 1, the injection passage 311 and the guide surface The distance x to 321d is preferably x = 4.85 mm or more, more preferably 5.0 mm or less, where the guide surface 321d does not interfere with the nail shaft 2b of the nail 2. That is, assuming that the head diameter D matches the diameter of the injection hole 312, the distance x is preferably about 71 to 74% of the diameter of the injection hole 312. With such a configuration, it is possible to prevent the nail head 2a from colliding with the braking surface 321d in the braking state and the nail 2 from being sunk into the driven material 3 due to a decrease in driving energy.

  The operation unit 321b extends from a bent portion of the substantially L-shaped braking member 321 in a direction substantially perpendicular to the injection direction. The surface facing the upper side of the operation unit 321 b is in contact with the end of the spring 323 and is urged downward by the elastic force of the spring 323. Accordingly, the braking member 321 rotates clockwise on the paper surface around the rotation shaft portion 322, that is, the contact portion 321a moves inward from the substantially U-shaped opening portion of the guide portion 310, and the contact surface 313a, 313b is biased so as to abut against the to-be-contacted surfaces 321e and 321f. Further, the operation unit 321 b is in contact with the cam 324 on the surface opposite to the surface in contact with the spring 323.

  The cam 324 rotates based on the operation of the knob 325 by the operator, and moves the braking member 321 in contact with the cam 324 to the first position and the second position. As shown in FIGS. 2A and 2B, the cam 324 has an outer periphery of the cam 324 on the lower surface of the operation portion 321b, that is, the surface opposite to the surface that contacts the spring 323 of the operation portion 321b. It is provided to abut. The cam 324 is formed on a semicircle from a cam surface 324a having an arcuate outer periphery and a cut-out surface 324b on a plane. Further, the distance from the rotation shaft portion 322 to the position where the cam 324 contacts the operation portion 321b is larger than the distance from the rotation shaft portion 322 to the position where the spring 323 contacts the operation portion 321b. Therefore, based on the lever principle, by rotating the cam 324, the spring 323 can be easily compressed and the operation portion 321b can be moved upward.

  As shown in FIG. 2A, in the braking state, the notch surface 324b of the cam 324 is in contact with the operation portion 321b before the nail head 2a contacts the braking surface 321c. Then, as shown in FIG. 2B, when the nail head 2a presses and lowers the braking surface 321c, the operation portion 321b rises against the urging force of the spring 323 and is separated from the notch surface 324b. As shown in FIG. 6, the cam surface 324a of the cam 324 is in contact with the operation portion 321b in the non-braking state. Therefore, the operation portion 321b is positioned above the urging force of the spring 323, compared to the braking state, that is, the state where the operation portion 321b is in contact with the notch surface 324b.

  The magazine device 500 is provided below the handle portion 200 and supplies the nail 2 into the injection passage 311. As shown in FIG. 1, the magazine device 500 includes a magazine 510 that fills the nail 2 and a nail feeder 520 that sequentially feeds the nail 2 attached to the magazine 510 into the injection passage 311.

  Next, the operation of the nail driver 1 according to this embodiment will be described. First, a case where the operator wants to reduce the driving force for the reason that the driven material 3 is soft will be described. As shown in FIG. 2A, the operator rotates the cam 324 by operating the knob 325 to bring the notch surface 324b into contact with the operation portion 321b. When the braking member 321 is moved to the position in the braking state in this way, the end of the contact portion 321a enters the injection passage 311 and interferes with the nail head 2a as shown in FIG. To position. In this state, when the operator presses the contact member 330 against the workpiece 3 and pulls the trigger 210 as shown in FIG. 1, the compressed air in the pressure accumulating chamber 400 enters the piston upper chamber, and the driver blade 130 The inside of the injection passage 311 is rapidly lowered. When the driver blade 130 presses the nail head 2a and passes through the injection hole 312 defined by the inner peripheral surface of the guide portion 310 and the guide surface 321d, the diameter of the injection hole 312 is smaller than that of the nail head 2a. As shown in FIG. 2A, the nail head 2a collides with the braking surface 321c and descends while contacting the braking surface 321c. At this time, when the braking surface 321c receives the force in the injection direction from the nail head 2a, the contact portion 321a moves in the right direction, that is, the braking member 321 resists the urging force of the spring 323 and centers on the rotation shaft portion 322. Move counterclockwise. Accordingly, a part of the driving energy of the driver blade 130 is used for friction between the nail head 2a and the braking surface 321c and the movement of the braking member 321, so that the driving energy is weakened. Then, as shown in FIG. 2B, the driver blade 130 descends while pressing the nail head 2a while the guide surface 321d of the braking member 321 is in contact with the peripheral surface of the driver blade 130, and the nail 2 is hit. It is driven into the insert 3. In this way, since the driving energy of the driving energy of the driver blade 130 is weakened, the nail 2 can be prevented from sinking into the driven material 3.

  Next, a case where the worker wants to increase the driving force due to the reason that the driven material 3 is hard will be described. As shown in FIG. 6, the operator rotates the cam 324 by operating the knob 325 to bring the cam surface 324a into contact with the operation portion 321b. When the braking member 321 is moved to the position in the non-braking state in this way, the contact portion 321a is positioned outside the injection passage 311, that is, so as not to interfere with the nail head 2a as shown in FIG. To do. Therefore, when the operator presses the contact member 330 against the workpiece 3 and pulls the trigger 210 as shown in FIG. 5 in this state, the compressed air in the pressure accumulating chamber 400 enters the piston upper chamber, and the driver blade 130 The nail 2 is driven into the driven material 3 by descending rapidly. Here, when the driver blade 130 presses the nail head 2a and passes through the injection hole 312 defined by the guide portion 321 and the guide surface 321d, the diameter of the injection hole 312 is larger than that of the nail head 2a. The head 2a does not contact the braking surface 321c as shown in FIG. Accordingly, since the driving energy of the driver blade 130 cannot be weakened, the nail driver 1 can drive the nail 2 into the driven material 3 with the maximum driving force that the nailing machine 1 has.

  As described above, in the nail driver 1 according to the present embodiment, when the driven material 3 is soft, the nail 2 is braked by the braking unit 320, so that the driving energy is reduced. Therefore, it is possible to prevent indentation into the workpiece 3. Furthermore, the operator can easily switch between a braking state and a non-braking state of the braking unit 320 according to the hardness of the workpiece 3 by operating the knob 325.

  In addition, this invention is not limited to said embodiment, A various deformation | transformation and application are possible. For example, in the present embodiment, the pneumatic nailer 1 is mentioned, but the present invention is not limited to this. That is, if the driving machine is provided with a driver blade, the present invention can be similarly implemented in a combustion type driving machine using fuel or an electric driving machine using a motor or the like. it can.

1 Nailer 100 Main body (housing)
110 Cylinder 111 Check valve 112 Air passage 113 Air passage 120 Piston 130 Driver blade 140 Return air chamber 150 Piston bumper 160 Main valve 161 Main valve chamber 162 Main valve spring 163 Exhaust rubber 164 Air passage 200 Handle portion 210 Trigger 220 Arm plate 230 Push lever 240 Trigger valve part 250 Plunger 300 Nose part 310 Guide part 311 Injection passage 312 Injection hole 313a, 313b Contact surface 320 Brake part 321 Brake member 321a Contact part 321b Operation part 321c Brake surface 322 Spring shaft 323 Spring 324 Cam 325 Knob 330 Contact member 400 Accumulation chamber 500 Magazine device 510 Magazine 520 Nail feeder 2 Nail 2a Nail head 2b Nail shaft 3 Material to be driven

Claims (3)

A driver blade that strikes the stop;
A slidably guiding the driver blade, and a nose portion formed with an injection passage through which the stopper is supplied and injected;
A braking member provided at an end of the injection passage in the injection direction and configured to brake the stopper that is hit by the driver blade and moves in the injection passage;
A biasing member that biases the end of the braking member in a direction toward the central axis of the injection passage;
The end portion of the braking member is bent in a direction toward the central axis of the injection passage.
A driving machine characterized by that. The end portion of the braking member is movable between a first position that interferes with the stopper and a second position that does not interfere with the stopper.
The driving machine according to claim 1. A guide portion provided at an end portion in the injection direction of the nose portion;
An injection hole defined by a tip of the injection passage in the injection direction by the end portion and the guide portion of the braking member, and the stopper is injected;
The diameter of the injection hole when the end of the braking member is located at the first position is 71 of the diameter of the injection hole when the end of the braking member is located at the second position. ~ 74%,
The driving machine according to claim 2.

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