JP6369231B2 - Driving machine - Google Patents

Description

  The present invention relates to a driving machine for driving a stopper such as a nail or a pin into a fixed object.

  A driving machine for driving a stopper such as a nail or a pin into a fixed object such as a flooring or a wall is known. This type of driving machine includes a magazine in which a plurality of stoppers are accommodated, an injection passage in which stoppers are sequentially supplied from the magazine, and a driver that hits the stoppers supplied to the injection passage and drives the fixed object. And a blade. The stopper hit by the driver blade is driven out from the tip (injection port) of the injection passage and driven into the fixed object.

  In the driving machine as described above, when the stopper is driven, a force opposite to the driving direction of the stopper acts on the driving machine body due to the reaction caused by the movement of the driver blade. On the other hand, the driving machine as described above has a grip portion such as a handle that is gripped by an operator. Such a gripping portion usually extends in a direction different from the driving direction of the stopper. That is, the driving machine as described above usually has a shape called a T-shape or a pistol shape. As a result, a rotational moment is generated with the gripping point on the gripping portion serving as a fulcrum (rotating shaft) due to the reaction force of the force with which the stopper is driven out from the injection port. If the presser cannot be pressed with sufficient force, the injection passage may be inclined due to the rotational moment. Specifically, when the driving machine main body rotates, a force that inclines the injection passage acts so that the injection port moves forward. In other words, since the injection passage is inclined, the injection port is brought forward. For this reason, the inner wall of the injection passage contacts the upper part of the stopper, and the upper part of the stopper is pushed forward. As a result, the stopper may be tilted forward and may be driven into the fixed object in the forward tilted state. In particular, a nail with a small head diameter or a nail with a short shaft tends to have a large inclination angle due to the influence of a rotational moment, and is often driven into a fixed object in an inclined state.

  Therefore, in the driving machine described in Patent Document 1, the first guide portion and the second guide portion whose position relative to the first guide portion are variable at the tip of the nose portion forming the injection passage. An exit is formed. In this driving machine, when the position of the second guide portion with respect to the first guide portion is changed, the cross-sectional area of the injection port is changed. Therefore, by adjusting the cross-sectional area of the injection port according to the size of the stopper, it is possible to prevent or reduce the inclination of the stopper punched out from the injection port.

Japanese Patent No. 5348456

  In the driving machine described in Patent Document 1, an injection port having a variable cross-sectional area is provided at the tip of the nose portion, and this injection port is formed by a plurality of members, which is a simple structure. It was difficult. In addition, since the tip of the nose portion tends to be large (thick), it may be difficult to form a tool with a thin tip.

  An object of the present invention is to prevent or reduce the inclination of the stopper by a simple method, and to obtain a configuration that more reliably prevents or reduces the inclination of the stopper than the conventional configuration.

  The driving machine of the present invention is a driving machine for driving a stopper into a fixed object. The driving machine includes a nose portion that forms an upper portion of an injection passage to which the stoppers are sequentially supplied, and an end portion of the nose portion that is slidable with respect to the nose portion, and a lower portion of the injection passage Forming a contact portion, a driver blade for striking the stopper supplied to the injection passage and driving it into the fixed object, a main body in which the driver blade is reciprocally accommodated, and a side surface of the main body A gripping portion that extends in a direction intersecting the driving direction of the stopper and is gripped when the stopper is driven into the fixed object. Then, with respect to the axis connecting the center of the driver blade and the center of the lower portion of the injection passage formed by the contact portion, the central axis of the upper portion of the injection passage formed by the nose portion is on the gripping portion side. positioned.

  In one aspect of the driving machine according to the present invention, a magazine that houses a plurality of the stoppers is further provided, and the central axis is located on the magazine side with respect to the axis.

  In another aspect of the driving machine according to the present invention, the driving machine includes a guide member that forms an inner wall of the lower portion of the injection passage together with the inner surface of the contact portion, and rotatably supports the guide member. A supporting shaft, an elastic member that urges the guide member in the first direction, and a restricting portion that restricts rotation of the guide member in the first direction and holds the guide member in an initial position. Have. When the guide member is in the initial position, the guide surface protrudes inward from a part of the inner wall of the lower portion of the injection passage formed by the contact portion, and the stopper comes into contact with the guide surface. Thus, when a predetermined force or more is applied to the guide member, the guide member rotates in a second direction opposite to the first direction against the biasing of the elastic member.

  In another aspect of the driving machine of the present invention, the amount of deviation of the central axis with respect to the axis is 5% or more and 10% or less of the diameter of the lower portion of the injection passage.

  According to the present invention, it is possible to prevent or reduce the inclination of the stopper while avoiding the enlargement of the tip of the nose portion.

It is sectional drawing of the nail driver to which this invention was applied. It is a partial expanded sectional view of the nailing machine shown by FIG. It is another partial expanded sectional view of the nailing machine shown by FIG. It is another partial expanded sectional view of the nailing machine shown by FIG. It is another partial expanded sectional view of the nailing machine shown by FIG. It is a partial expanded sectional view which shows one of the modifications of the nail driver shown by FIG.

  Hereinafter, an example of an embodiment of a driving machine according to the present invention will be described in detail with reference to the drawings. The driving machine according to the present embodiment is a nailing machine that drives a nail as a stopper into a fixed object using compressed air as a driving source.

  As shown in FIG. 1, the nail driver 1 includes a main body 2, a handle 3 that extends from a side surface of the main body 2 in a direction intersecting the longitudinal direction of the main body 2, and a nose portion 4 provided at an end of the main body 2. A contact portion 5 provided at the end of the nose portion 4 and a magazine device 6 provided across the handle 3 and the nose portion 4. The contact portion 5 is sometimes called a “contact nose”. In the following description, the longitudinal direction of the main body 2 is defined as the vertical direction. Further, the side on which the handle 3 is provided is defined as the rear, and the side opposite to the side on which the handle 3 is provided is defined as the front. According to this definition, the nose portion 4 is provided at the lower end of the main body 2, and the contact portion 5 is provided at the lower end of the nose portion 4. The handle 3 extends rearward from the main body 2.

  A cylindrical cylinder 10 is accommodated in the main body 2, and a driver blade (sometimes referred to as “drive bit”) 11 is accommodated in the cylinder 10 so as to be movable up and down (reciprocable). ing. A piston head 11 a is integrally formed at one end of the driver blade 11, and the piston head 11 a slides on the inner peripheral surface of the cylinder 10 as the driver blade 11 moves up and down. A seal member such as an O-ring is fitted on the outer peripheral surface of the piston head 11a to ensure airtightness with the inner peripheral surface of the cylinder 10.

  When the illustrated trigger 12 is operated in a state where a predetermined condition is satisfied, compressed air is supplied to the upper chamber of the cylinder 10 (a space above the piston head 11a), and the driver blade is driven by the pressure of the compressed air. 11 is pushed down. When the driver blade 11 is pushed down, the lower end surface of the driver blade 11 hits the head of a nail (not shown) sequentially supplied from the magazine device 6 and drives the nail into a fixed object (not shown). In this embodiment, when the trigger 12 is operated in a state where the contact portion 5 provided at the lower end of the nose portion 4 is pushed up, compressed air is supplied to the cylinder 10, and the driver blade 11 is driven by the pressure of the compressed air. Is driven. More specific description will be given below.

  As shown in FIG. 1, the main body 2 is disposed at a cylindrical housing 20, a head cover (also referred to as an “exhaust cover”) 21 disposed above the housing 20, and a lower end of the housing 20. And an under cover 22. Further, an annular member 30 surrounding the upper portion of the cylinder 10 is disposed between the upper end of the housing 20 and the head cover 21, and an air duster 31 is disposed above the annular member 30. The annular member 30 in the present embodiment is a die-cast aluminum member.

  The annular member 30 has a hollow structure, and the internal space of the annular member 30 communicates with the internal space of the handle 3. A connection plug 3a communicating with the internal space of the handle 3 is provided at the end of the handle 3, and the internal space of the handle 3 and the internal space are communicated with a compressor (not shown) connected to the connection plug 3a. Compressed air is supplied to the internal space of the annular member 30. The compressed air supplied to these internal spaces is supplied to the upper chamber of the cylinder 10 as the trigger 12 is operated, and pushes down the driver blade 11. That is, the internal space of the annular member 30 and the internal space of the handle 3 form a pressure accumulation chamber 13 in which compressed air supplied to the cylinder 10 is stored.

  In addition, a main valve 40 that is switched to a first state in which communication between the pressure accumulating chamber 13 and the cylinder 10 is cut off and a second state in which the pressure accumulating chamber 13 and the cylinder 10 are communicated with each other is disposed on the upper portion of the main body 2. Yes. When the trigger 12 is operated with the contact portion 5 pushed up, the main valve 40 opens (switches from the first state to the second state), and the compressed air is supplied to the upper chamber of the cylinder 10 as described above. .

  Further, a return chamber 23 communicating with the inside of the cylinder 10 is formed around the cylinder 10 through two upper and lower ports. One-way valve (backward) that allows air to flow from the cylinder 10 to the return chamber 23 and does not allow air to flow from the return chamber 23 to the cylinder 10 at one port (upper port) disposed above. Stop valve) is provided. On the other hand, the other port (lower port) arranged below is not provided with any valve.

  When the main valve 40 is switched from the first state to the second state in accordance with the operation of the trigger 12 and the driver blade 11 shown in FIG. 1 is lowered, the inside of the lower chamber of the cylinder 10 (the space below the piston head 11a). Air flows into the return chamber 23 through the upper port and the lower port. After the piston head 11a passes through the upper port, air in the upper chamber of the cylinder 10 flows into the return chamber 23 from the upper port, and air in the lower chamber of the cylinder 10 continues to flow into the return chamber 23 from the lower port. .

  On the other hand, when the operation of the trigger 12 is released, the main valve 40 is switched from the second state to the first state, the communication between the pressure accumulating chamber 13 and the cylinder 10 is interrupted, and the exhaust path (not shown) opens, the lower port , Compressed air flows from the return chamber 23 into the cylinder 10 (reverse flow), and the driver blade 11 is pushed up. The driver blade 11 shown in FIG. 1 is located at the top dead center. The driver blade 11 shown in FIG. 1 descends to a position (bottom dead center) where the piston head 11a collides with the piston bumper 24 disposed in the lower part of the cylinder 10.

  As shown in FIG. 2, a nose portion 4 extending in the same direction as the housing 20 is provided under the under cover 22 of the housing 20, and the nose portion 4 has a lower end in the same direction as the nose portion 4. An extending contact portion 5 is provided. The contact portion 5 is slidable with respect to the nose portion 4 and is always urged downward by a spring (not shown). When the contact portion 5 is pressed against a fixed object (not shown), the contact portion 5 is pushed up along the nose portion 4 against the bias of the spring. As described above, when the trigger 12 (FIG. 1) is operated with the contact portion 5 pushed up, the compressed air is supplied to the cylinder 10 (FIG. 1) and the driver blade 11 is lowered.

  The nose portion 4 includes an inner space having a substantially U-shaped cross section, and the contact portion 5 includes an inner space having a substantially cylindrical cross section. The inner space of the nose portion 4 and the inner space of the contact portion 5 communicate with each other to form a series of injection passages 50. The magazine device 6 includes a magazine 6a that houses a bundle of bundled nails and a supply mechanism (feeder 6b) that sequentially feeds the nails that are housed in the magazine 6a. The nail is sequentially supplied to the injection passage 50 by 6b.

  As described above, a part (upper part) of the injection passage 50 is formed by the nose part 4, and the other part (lower part) of the injection passage 50 is formed by the contact part 5. In other words, in the injection passage 50 according to the present invention, a portion formed by the nose portion 4 is an upper portion, and a portion formed by the contact portion 5 is a lower portion. In the following description, a part of the injection passage 50 formed by the nose part 4 is referred to as an “injection passage upper part 51”, and another part of the injection passage 50 formed by the contact part 5 is referred to as “an injection passage lower part”. May be referred to as 52 ″. A nail (not shown) is supplied to the upper portion 51 of the injection passage by the feeder 6b and is hit by the driver blade 11 descending in the injection passage 50. The hit nail sequentially passes through the injection passage upper portion 51 and the injection passage lower portion 52 and is driven out from the lower end (injection port 53) of the injection passage 50.

  Here, the central axis of the nose portion 4 is located on the handle side with respect to the axis X connecting the center of the driver blade 11 and the center of the contact portion 5. In other words, the central axis of the nose portion 4 is located on the magazine side with respect to the axis X. In other words, the central axis of the nose portion 4 is located behind the axis X. The center of the contact portion 5 means the center of the injection passage lower portion 52, and the center axis of the nose portion 4 means the center axis of the injection passage upper portion 51. That is, the central axis of the injection passage upper portion 51 is shifted to the handle side with respect to the axis X connecting the center of the driver blade 11 and the center of the injection passage lower portion 52. In other words, the injection passage upper portion 51 is eccentric rearward with respect to the driver blade 11 and the injection passage lower portion 52. Note that the amount of deviation of the central axis of the injection passage upper portion 51 with respect to the preferred axis X in the present embodiment is preferably 5% to 10% of the diameter of the injection passage lower portion 52.

  On the other hand, the centers of the driver blade 11 and the contact portion 5 coincide with each other. The diameter of the driver blade 11 substantially matches the inner diameter of the contact portion 5, that is, the diameter of the injection passage lower portion 52. More precisely, the lower part of the nose part 4 is inserted into the upper part of the contact part 5. In other words, the upper part of the contact part 5 covers the lower part of the nose part 4. Therefore, the inner diameter of the upper part of the contact part 5 that overlaps the lower part of the nose part 4 is larger than the diameter of the driver blade 11 and the inner diameter of the nose part 4. That is, only the lower portion of the contact portion 5 has an inner diameter that substantially matches the diameter of the driver blade 11. In other words, a portion of the contact portion 5 having an inner diameter substantially the same as the diameter of the driver blade 11 is the lower portion of the contact portion 5. The diameter of the driver blade 11 and the inner diameter of the contact portion 5 that is substantially the same as the diameter are substantially the same as the maximum diameter of the head of the nail, and in this embodiment, as an example, it is about 9.0 mm.

  In the nailing machine 1 in which the centers of the driver blade 11, the nose portion 4 (injection passage upper portion 51) and the contact portion 5 (injection passage lower portion 52) are in the above positional relationship, the inclination of the nail is prevented or reduced as follows. The

  Please refer to FIG. As described above, the nail 100 supplied to the injection passage 50 by the magazine device 6 is hit by the driver blade 11 descending in the injection passage 50, passes through the injection passage 50, and is driven out from the injection port 53. Here, in the nailing machine 1 according to the present embodiment, the central axis of the injection passage upper portion 51 is shifted rearward with respect to the central axes of the driver blade 11 and the injection passage lower portion 52. Therefore, when the nail 100 passes through the injection passage upper portion 51, the nail 100 falls more rearward than when the center axis of the injection passage upper portion 51 coincides with the center axis of the driver blade 11 and the injection passage lower portion 52. . That is, the rearward inclination angle of the nail 100 is increased.

  Thereafter, a force opposite to the launching direction of the nail 100 acts on the nail driver 1 due to the reaction caused by the lowering of the driver blade 11. Then, before the nail 100 is completely driven out from the injection port 53, a rotational moment is generated in the nail driver 1, and the injection passage 50 is inclined. Specifically, as shown in FIG. 4, a rotation moment acts on the nail driver 1, and the injection passage 50 is inclined so that the injection port 53 is pushed forward. As a result, the head of the nail 100 is pushed forward by the wall surface of the lower portion of the injection passage 52, and the nail 100 inclined rearward becomes vertical or substantially vertical. Specifically, the head of the nail 100 is pushed forward by the rear portion 52b (hereinafter referred to as “lower wall rear portion 52b”) of the wall surface of the injection passage lower portion 52. That is, the inclination (rearward inclination) of the nail 100 is corrected, and the nail 100 is driven straight or substantially straight.

  As described above, in the present invention, the nail 100 is intentionally tilted backward by shifting the central axis of the injection passage upper portion 51 to the handle side (rear). Then, the nail 100 is pushed forward by the wall surface of the injection passage lower part 52 with the inclination of the injection passage 50 thereafter, and finally the nail 100 is straightened or substantially straightened.

  Further, since the central axis of the injection passage upper portion 51 is shifted rearward, the front portion 51 a of the wall surface of the injection passage upper portion 51 (hereinafter referred to as “upper wall front portion 51 a”) is located in front of the wall surface of the injection passage lower portion 52. It is located behind the portion 52a (hereinafter referred to as the “lower wall front portion 52a”). When the nail 100 is tilted as shown in FIGS. 3 and 4, that is, when the nail 100 is tilted backward, a force that pushes the driver blade 11 forward acts on the driver blade 11. A force that pushes the nail 100 backward acts. However, the driver blade 11 is restricted from moving forward by the upper wall surface front portion 51a located rearward of the lower wall surface front portion 52a. On the other hand, as described above, the head of the nail 100 is pushed forward by the lower wall surface rear portion 52b. As a result, the engagement between the driver blade 11 and the head of the nail 100 is difficult to disengage, and clogging and buckling of the nail 100 are prevented. Furthermore, as shown in FIG. 5, when the nail 100 tilts forward in the injection passage 50 due to some cause, an increase in the forward tilt angle is suppressed by the upper wall surface front portion 51 a.

  As described above, in the nail driver 1 according to the present embodiment, the inclination (backward inclination and forward inclination) of the nail 100 is prevented or reduced, and the nail 100 can be driven straight or substantially straight into the fixed object. .

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, as shown in FIG. 6, a guide member 60 that protrudes into the injection passage 50 and corrects the inclination of a nail (not shown) that passes through the injection passage 50 may be provided.

  The guide member 60 abuts the guide surface 60 a that forms the inner wall of the injection passage lower portion 52 together with the inner surface of the contact portion 5, and one end of a spring 61 as an elastic member disposed between the magazine device 6 and the guide member 60. And a pressing surface 60b. The guide member 60 is rotatably supported by a support shaft 62 at a substantially intermediate position between the guide surface 60a and the pressing surface 60b. The guide member 60 is always urged in the first direction (arrow a direction) by the restoring force of the spring 61. However, the contact portion 5 is provided with a restriction surface 5a as a restriction portion facing the guide surface 60a. When the guide surface 60a contacts the restriction surface 5a, further rotation of the guide member 60 is restricted. The That is, the position shown in FIG. 6 is the initial position of the guide member 60, and the guide member 60 is held at the initial position by the restriction surface 5a.

  As shown in FIG. 6, when the guide member 60 is in the initial position, the guide surface 60 a is more than the part of the inner wall of the lower part of the injection passage 52 formed by the inner surface of the contact portion 5 (lower wall rear portion 52 b). Is also inward (forward). Therefore, when the nail passing through the injection passage 50 is inclined backward, the upper part (mainly the head) of the nail contacts the guide surface 60a, and the backward inclination of the nail is corrected. On the other hand, when the nail passing through the injection passage 50 is tilted forward, the lower part (mainly the tip) of the nail contacts the guide surface 60a, and the forward tilt of the nail is corrected.

  However, when a predetermined force or more is applied to the guide member 60 due to the nail contact with the guide surface 60a, the guide member 60 resists the bias of the spring 61 in the second direction opposite to the first direction (arrow b direction). The guide surface 60a is retracted outward (rearward). Therefore, the guide member 60 does not hinder the nail launching, and the nail is not clogged or buckled. That is, the inclination (backward inclination and forward inclination) of the nail is corrected by an appropriate force corresponding to the driving force of the nail.

DESCRIPTION OF SYMBOLS 1 Nailing machine 2 Main body 3 Handle 3a Connection plug 4 Nose part 5 Contact part 5a Restricting surface 6 Magazine device 6a Magazine 6b Feeder 10 Cylinder 11 Driver blade 11a Piston head 12 Trigger 13 Accumulation chamber 20 Housing 21 Head cover 22 Under cover 23 Return chamber 24 piston bumper 30 annular member 31 air duster 40 main valve 50 injection passage 51 injection passage upper portion 51a upper wall front portion 52 injection passage lower portion 52a lower wall front portion 52b lower wall rear portion 53 injection port 60 guide member 60a guide surface 60b pressing surface 61 Spring 62 Support shaft 100 Nail

Claims (4)

A driving machine for driving a stopper into a fixed object,
A nose portion forming an upper portion of an injection passage to which the stoppers are sequentially supplied;
A contact portion provided at an end of the nose portion so as to be slidable with respect to the nose portion, and forming a lower portion of the injection passage;
A driver blade for striking the stopper supplied to the injection passage and driving it into the fixed object;
A main body in which the driver blade is reciprocally accommodated;
A gripping part that extends from a side surface of the main body in a direction crossing the driving direction of the stopper, and is gripped when the stopper is driven into the fixed object;
Have
The contact portion is provided with a lower portion of the nose portion inserted therein, and an upper portion that covers the lower portion and a lower portion that is thinner than the upper portion and does not cover the nose portion. The lower part of the injection passage is formed by the lower part of
And the center of the driver blade, and the center of the injection passage path lower portion formed by the lower portion of the contact portion with respect to the axis connecting the central axis of the injection passage path portion formed by the nose portion is the Located on the gripping part side,
Driving machine. Further comprising a magazine for accommodating a plurality of said stops;
The central axis is located on the magazine side with respect to the axis.
The driving machine according to claim 1. A guide member having a guide surface that forms an inner wall of the lower portion of the injection passage together with the inner surface of the contact portion;
A support shaft that rotatably supports the guide member;
An elastic member for urging the guide member in the first direction;
A restricting portion for restricting rotation of the guide member in the first direction and holding the guide member in an initial position;
When the guide member is in the initial position, the guide surface protrudes inward from a part of the inner wall of the lower portion of the injection passage formed by the contact portion,
When a predetermined force or more is applied to the guide member due to the contact of the stopper with the guide surface, the guide member rotates in a second direction opposite to the first direction against the bias of the elastic member. Move,
The driving machine according to claim 1 or 2. The amount of deviation of the central axis with respect to the axis is 5% or more and 10% or less of the diameter of the lower portion of the injection passage.
The driving machine according to any one of claims 1 to 3.

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