JP2010036313A - Driving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving machine capable of ejecting dirt and dust entered between a nose part and a tip member. <P>SOLUTION: The driving machine is equipped with a driver blade 8 for driving a fastener, a nose portion 5 for guiding the driver blade 8 and having a first injection port 4, a push lever 13 movable in the driving direction relative to the nose portion 5 and having the upper end coordinated with a trigger means, and a contact member 15 disposed on the lower end of the push lever 13 and having a second injection port 21. A taper portion 15b is formed on an upper part of the contact member 15 where a diameter of the upper part is larger. The upper end diameter of the tapered portion 15b is made larger than that of the first injection port 4 of the nose portion 5. A plurality of grooves are formed in an injecting direction on an inner peripheral surface of the second injection port 21 of the contact member 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a driving machine, and more particularly to a driving machine that can discharge dust, dust, and the like that have entered between a nose portion and a tip member.

  2. Description of the Related Art A driving machine that operates a driver blade with power such as compressed air and drives a stopper such as a nail is known. In such a driving machine, an injection port is formed in a nose portion located at the lower part of the housing, and a driver blade that strikes a stopper is slidably guided, and the driver blade is driven by the action of compressed air. The stopper is driven out from the tip of the injection port in the direction of the driven material. In the driving machine having the injection port, a push lever having a contact member is used. However, in order to prevent the bending of the stopper, the contact member of the push lever is connected to the injection port of the nose portion as in Patent Document 1. The injection port has the same diameter and the same shape.

Japanese Utility Model Publication No. 2-51079

  By the way, among materials used in the construction of houses, etc., dust is scattered depending on the member to be driven, so that dust, dust, etc. adhere to the tip of the nose part and the inner peripheral surface of the contact member of the push lever. There is. In such a case, dust, dust, etc. accumulate between the outer periphery of the tip of the nose portion and the inner wall surface of the annular portion of the contact member of the push lever as the driving operation is repeated for a long time. At this time, the accumulated dust, dust, etc. may increase the sliding resistance between the push lever and the nose, resulting in malfunctions such as the push lever cannot be returned to the lowermost end.

  The occurrence of this malfunction will be specifically described with reference to FIGS. FIG. 9 is an enlarged cross-sectional view of the configuration in the vicinity of the nose portion 5 in the conventional device. The nail 33 guided to the injection port 4 by the magazine 9 is struck by a driver blade 58 moved by compressed air. The tip of the nose portion 5 has a shape that is narrowed so that the tip (lower end) is narrowed. A contact member 55 having a launch port 57 is attached to the tip of the push lever 13. FIG. 10 is a cross-sectional view showing the situation when the nail 33 is driven. When the nail 33 is repeatedly driven, the dust 40 is accumulated inside the contact member 55. Since the dust 40 is compressed by the driver blade 58 and pressed against the inner peripheral wall of the contact member 55, the inner diameter of the inner peripheral wall is gradually narrowed as shown in FIG. As a result, there is a possibility that the driver blade 58 cannot return to the original position or malfunction occurs.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a driving machine capable of discharging dust, dust, and the like that have entered between a nose portion and a contact member by a sliding operation of a driver blade. There is.

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

  According to one aspect of the present invention, a driver blade, a nose portion that guides the driver blade and has a first injection port, a push lever that is arranged to be movable in the driving direction with respect to the nose portion, and a push lever In a driving machine that includes a contact member that is attached to the lower end of the blade and that has a second injection port, and the stopper is driven by a driver blade through the first and second injection ports, the contact member has a taper having a large diameter on the upper side. The upper end of the tapered portion is formed larger than the diameter of the injection port of the nose portion, and a plurality of grooves are formed in the injection direction on the inner peripheral surface of the second injection port of the contact member. The plurality of grooves are preferably formed continuously from the upper end portion to the lower end portion of the inner peripheral surface of the contact member in the injection direction. The circumferential width of the groove is smaller than the diameter of the stop guided by the driver blade.

  According to another feature of the invention, a concave shaft portion having a diameter smaller than the diameter of the tip portion is formed in the vicinity of the tip portion of the driver blade guided by the first and second injection ports. The concave shaft portion may be positioned between the lower end of the first injection port and the lower end of the second injection port when the driver blade reaches bottom dead center. The driver blade has a tapered shape with a gradually increasing diameter from the concave shaft portion to the tip portion.

  According to the first aspect of the present invention, the contact member is formed with a tapered portion having a large diameter on the upper side, the upper end of the tapered portion is formed larger than the diameter of the injection port of the nose portion, and the second injection port of the contact member Since a plurality of grooves are formed in the injection direction on the inner peripheral surface, dust and dust attached to the inner peripheral surface of the contact member can be discharged from the concave groove portion to the outside of the contact member. It is possible to prevent the push lever locking phenomenon (operation failure) due to the accumulation of etc.

  According to the invention of claim 2, since the grooves are continuously formed in the injection direction from the upper end portion to the lower end portion of the inner peripheral surface of the contact member, the discharge of dust, dust, etc. adhering to the inner peripheral surface is obstructed. Smooth discharge can be achieved.

  According to the invention of claim 3, since the circumferential width of the groove is smaller than the diameter of the stopper guided by the driver blade, the guide of the stopper is not hindered by forming the groove.

  According to the invention of claim 4, since the concave shaft portion having a diameter smaller than the diameter of the tip portion is formed in the vicinity of the tip portion of the driver blade guided by the first and second injection ports, the driver blade is lowered. When the dead center is reached, a large gap is formed between the second injection port of the contact member and the concave shaft portion of the driver, so that contact is made between the tip of the contact member and the concave shaft portion on the driver distal end side. It is possible to scrape dust, dust and the like accumulated on the injection port from the tapered portion inside the member.

  According to the invention of claim 5, the concave shaft portion is formed so as to be positioned between the lower end of the first injection port and the lower end of the second injection port when the driver blade reaches the bottom dead center. Therefore, since the gap between the second injection port of the contact member and the concave shaft portion of the driver is formed larger, it is possible to increase the scraping effect of dust, dust and the like.

  According to the invention of claim 6, since the concave shaft portion having a diameter smaller than the diameter of the tip portion is formed in the vicinity of the tip portion of the driver blade guided by the first and second injection ports, the driver blade is lowered. When the dead center is reached, a large gap is formed between the second injection port of the contact member and the concave shaft portion of the driver, so that contact is made between the tip of the contact member and the concave shaft portion on the driver distal end side. It is possible to scrape dust, dust and the like accumulated on the injection port from the tapered portion inside the member.

  According to the invention of claim 7, the concave shaft portion is formed to be positioned between the lower end of the first injection port and the lower end of the second injection port when the driver blade reaches the bottom dead center. Therefore, since the gap between the second injection port of the contact member and the concave shaft portion of the driver is formed larger, scraping of dust, dust and the like can be effectively performed.

  According to the eighth aspect of the present invention, since the tapered portion whose diameter gradually increases is formed from the concave shaft portion to the tip portion of the driver blade, scraping of dust, dust, etc. can be smoothly performed.

  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, parts having the same function are denoted by the same reference numerals, and repeated description is omitted. Further, in the present specification, description will be made assuming that the injection direction in which the stopper is driven out is the downward direction, and that the upper and lower directions are the directions shown in FIG.

  FIG. 1 is a side view of a driving machine according to an embodiment of the present invention, partially showing a cross section thereof. The nailing machine 1 is attached to a housing 6, a handle portion 6 a that is molded integrally with the housing 6, a nose portion 5 that is attached to the lower side of the housing 6 and guides driving of a stopper, and the nose portion 5. A magazine 9 is included. An upper portion of the nose portion 5 is fixed to the lower portion of the housing 6 with a bolt 26, and a cylindrical first injection port 4 that guides the driver blade 8 is formed in the lower portion. The magazine 9 has a stopper supply mechanism that sequentially supplies a plurality of stoppers to be stored to the nose portion 5.

  An air pressure accumulation chamber (not shown) is formed in the housing 6 and the handle portion 6a, and accumulates compressed air supplied from an external air compressor (not shown) via an air hose. A cylindrical cylinder 12 is provided in the housing 6. The piston 3 is slidably disposed in the cylinder 12. A driver blade 8 for driving a nail 33 is attached to the piston 3. For example, the driver blade 8 having a circular cross section in the longitudinal direction (injection direction) can be used. A seal member (not shown) such as an O-ring that seals between the piston 3 and the cylinder 12 is provided on the outer periphery of the piston 3.

  The piston 3 is located at the top dead center (the uppermost position as shown in FIG. 1) in the initial state, and the compressed air accumulated in the pressure accumulating chamber flows into the cylinder 12 between the main valve 10 and the piston 3. By doing so, the upper side of the piston 3 is pressed, so that the piston 3 suddenly moves in the cylinder 12 toward the bottom dead center. Since the driver blade 8 attached to the lower part of the piston 3 also moves downward, the nail 33 is injected by the lower end portion. The air below the piston 3 in the cylinder 12 flows into the return air chamber as the piston 3 moves downward, and after the piston 3 passes through the air passage 13 provided in the cylinder 12, The compressed air above the piston 4 flows into a return air chamber (not shown). Excess energy of the driver blade 8 after driving the nail 33 is absorbed by deflecting a piston damper (not shown). When the compressed air on the upper side of the piston 3 in the cylinder 12 is discharged, the lower side of the piston 3 in the cylinder 12 is pressed by the compressed air, and the piston 3 and the driver blade 8 return to the position of the top dead center.

  A plunger 29 for starting the inflow of high-pressure air into the cylinder 12 and a trigger 7 operated by an operator are provided in the vicinity of the base of the handle portion 6a. The starting means 30 for sending in is started. A push lever 13 slidable in the injection direction (vertical direction) is provided at the tip of the injection direction, and the tip (lower end) of the push lever 13 has a substantially cylindrical shape having a punching hole 21 at the lower end of the push lever 13. The contact member 15 is attached. The push lever 13 extends to the vicinity of the attachment portion of the handle portion 6 a and the vicinity of the trigger 7 via the extension arm portion 14. The driving machine 1 is configured such that the striking mechanism is activated when both the pressing operation of the push lever 13 against the material to be driven and the pulling operation of the trigger 7 by the operator are performed.

  FIG. 2 is an enlarged cross-sectional view of the configuration in the vicinity of the nose portion 5 in FIG. As shown in FIG. 2, the push lever 13 extends from the vicinity of the attachment portion of the handle portion 6 a to the tip in the injection direction of the nose portion 5 via the extension arm portion 14, and can slide up and down along the nose portion 5. Retained. The push lever 13 is biased downward by a spring (not shown), and FIG. 2 shows a state where the push lever 13 is located at the lowermost end.

  A cylindrical contact member 15 is attached to the lower end of the push lever 13. The contact member 15 has a thick cylindrical shape with a size and shape that covers the tip portion 5a of the nose 5 at the rear, and a second injection port 15a having a discharge port 21 for driving the nail 33 forward is formed. . The second injection port 15 a is a passage for guiding the nail 33 and has a thin cylindrical shape corresponding to the size of the head of the nail 33. The shape of the second injection port 15a is substantially the same as that of the first injection port 4 formed at the distal end portion 5a of the nose 5 except that a gear-like portion 16 described later is formed. In the contact member 15, a thick cylindrical portion 15c and a thin cylindrical injection port 15a are connected by a tapered portion 15b. .

  FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2 and a view seen from the AA part in the downward direction. A plurality of concave groove portions 20 are formed on the inner peripheral side of the contact member 15, and as a result, a convex rib portion 19 is formed between the concave groove portions 20 adjacent to the concave groove portion 20. A gear-shaped portion 16 is formed by the concave groove portion 20 and the convex rib portion 19. The circumferential width of the groove in the concave groove 20 is sufficiently smaller than the driver blade 8 guided by the second injection port 15a, and is narrower than the main body portion excluding the head of the nail 33. It is important that the nail 33 and the driver blade 8 are not rattled by the concave groove 20. In FIG. 3, the width of the groove seems to become narrower as it goes downward from the concave groove portion 20, but it only looks so because the perspective method is used in the description of the drawing. As can be understood by looking at the groove formed in the center in the left-right direction of the member 15, the width of the groove is continuously formed from the upper end to the lower end of the contact member 15.

  FIG. 4 is an enlarged cross-sectional view of the configuration in the vicinity of the nose portion 5 of FIG. 1, and shows a state where driving of the nail 33 is completed by the driver blade 8. In a state where the push lever 13 is pushed into the driven member 32, the driver blade 8 moves to the lowest end, so that the nail 33 is driven into the driven member 32. If there is dust or dirt on the inner peripheral side of the contact member 15, a part is pushed downward by the head of the driver blade 8 or the nail 33, and from the inner peripheral side of the contact member 15 through the launch port 21. Although it is discharged outside, the rest remains on the inner peripheral side of the contact member 15 like the dust 40.

  On the other hand, in the present embodiment, a concave shaft portion 8c having a diameter smaller than the tip portion 8a is formed near the tip of the driver blade 8 having a circular cross section in the injection direction. The concave shaft portion 8 c is formed at a position where the concave region is between the second injection port 15 a of the contact member 15 and the first injection port 4 of the nose portion 5 at the bottom dead center of the driver blade 8. The As can be understood from FIG. 4, the inner peripheral side of the position where the dust 40 stays at the bottom dead center position, that is, the position where the nail 33 has been driven, just faces the concave shaft portion 8 c. Therefore, when the dust 40 moves to the inner peripheral side by the concave shaft portion 8c and the driver blade 8 returns to the top dead center, the taper portion 8b formed on the upper side of the tip portion 8a of the driver blade 8 having a large diameter causes 40 is scraped upward. The dust 40 thus scraped off falls downward from the second injection port 15a of the contact member 15 after the driver blade 8 returns. Although the dust 40 may not fall by this operation, the dust 40 can be effectively discharged by repeating the driving operation of the nail 33.

  FIG. 5 is a diagram showing a state in which the dust 40 that does not fall in this way is pushed out during the next driving. The dust 40 moves to the inner peripheral side by a gap between the driver blade 8 and the contact member 15 generated by the concave groove portion 8c. So that most of it is discharged. Further, since the tapered portion 8b is formed below the concave shaft portion 8c, the driver blade 8 does not interfere with the discharge of the dust 40, and therefore the dust 40 is easily discharged.

  As described above, in the present embodiment, since the plurality of grooves are formed in the injection direction on the inner peripheral surface of the contact member 15, dust, dust, etc. adhering to the inner peripheral surface is discharged from the concave groove portion to the outside. Therefore, the lock phenomenon (operation failure) of the push lever 13 due to accumulation of dust, dust and the like can be prevented.

  Next, the structure of the guide part of the driving machine which concerns on the 2nd Embodiment of this invention is demonstrated using FIG. 6 is different from the structure of FIG. 4 in the shape of the driver blade 58. Unlike the one shown in FIG. 4, the driver blade 58 is not formed with the concave shaft portion 8c, and has the same shape as that of the known example. Therefore, although the effect of discharging and scraping dust is inferior to that of FIG. It can be used to effectively discharge trash and dust.

  FIG. 7 is a diagram for explaining the discharge effect of the dust 40 in the second embodiment. In FIG. 7, the dust 40 is pushed downward by the head of the driver blade 8 or the nail 33, and the dust 40 is discharged from the inner peripheral side of the contact member 15 to the outside through the ejection port 21. Therefore, it has a marked effect compared to the conventional example shown in FIG.

  FIG. 8 is a diagram illustrating the structure of the guide portion of the driving machine according to the third embodiment of the present invention. In the third embodiment, the driver blade 8 having the concave shaft portion 8c and the tapered portions 8b and 8d is the same as the first embodiment, but a groove is formed on the inner peripheral side of the contact member 55. The structure is the same as that of the conventional example. Even with this structure, since a gap is generated between the driver blade 8 and the contact member 55, there is an effect that dust is easily discharged.

  Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, although the concave groove 20 is continuously formed from the upper end to the lower end on the inner peripheral side of the contact member 15, the same effect can be sufficiently obtained by forming only the lower 2/3 or the lower half. can get.

  Further, the present invention can be applied not only to a nail as a fastener but also to a screwdriver using a screw. Furthermore, although this embodiment demonstrated the case where the driving machine which used compressed air as the power drive source was used, a power drive source is not limited to compressed air, and it power-drives a gas combustion type power drive source and an electric motor. It can also be applied to the source driving machine.

It is a side view of the driving machine which concerns on embodiment of this invention, and shows the cross section partially. It is sectional drawing to which the structure of the nose part 5 vicinity of FIG. 1 was expanded. It is the top view which looked at the contact member of FIG. 1 from the top. FIG. 2 is an enlarged cross-sectional view of the configuration in the vicinity of the nose portion 5 in FIG. 1, showing a state where driving of the nail 33 is completed by the driver blade 8. It is sectional drawing to which the structure of the nose part 5 vicinity of FIG. 1 was expanded, and is a figure which showed a mode that the dust 40 which does not fall was pushed out in the case of the next implantation. It is a figure explaining the structure of the guide part of the driving machine which concerns on the 2nd Embodiment of this invention. It is a principal part expansion part which shows a state when the push lever of the driving machine which concerns on the 2nd Embodiment of this invention returns to a top dead center side. It is a figure explaining the structure of the guide part of the driving machine which concerns on the 3rd Embodiment of this invention. It is sectional drawing to which the structure of the nose part 5 vicinity in the driving machine of a prior art example was expanded. It is sectional drawing which shows the condition at the time of nailing of the driving machine of a prior art example. It is an expanded sectional view of the contact member 55 in the conventional driving machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driving machine 2 Cylinder 3 Piston 4 (1st) Injection port 5 Nose part 6 Housing 6a Handle part 7 Trigger 8 Driver blade 8a (Driver blade) tip part 8b, 8d (Driver blade) taper part 8c (Driver) Concave shaft 9 of the blade 9 Magazine 10 Main valve 11 Stopper supply mechanism 12 Cylinder 13 Push lever 14 Extension arm 15 Contact member
15a (second) injection port 15b (contact member) taper portion 15c (contact member) thick cylindrical portion 16 gear-shaped portion 17 discharge port 19 convex rib portion 20 concave groove portion 21 ejection port 22 taper portion 23 fitting Joint
25 Mounting hole 26 Bolt 29 Plunger 30 Starting means 32 Placing member 33 Nail 35 Locking piece
39 Driver guide hole 55 Contact member 57 Launch port 58 Driver blade

Claims (8)

A driver blade, a nose portion that guides the driver blade and having a first injection port, a push lever arranged to be movable in the driving direction with respect to the nose portion, and a second attached to a lower end of the push lever In a driving machine for driving a stopper with the driver blade through the first and second injection ports,
The contact member is formed with a tapered portion having a large diameter on the upper side, and the upper end of the tapered portion is formed larger than the diameter of the injection port of the nose portion, and is formed on the inner peripheral surface of the second injection port of the contact member. A driving machine characterized in that a plurality of grooves are formed in the injection direction.   2. The driving machine according to claim 1, wherein the groove is formed continuously in an injection direction from an upper end portion to a lower end portion of an inner peripheral surface of the contact member.   2. The driving machine according to claim 1, wherein a width of the groove in a circumferential direction is smaller than a diameter of a stopper guided by the driver blade.   The concave shaft portion having a diameter smaller than the diameter of the tip portion is formed in the vicinity of the tip portion of the driver blade guided by the first and second injection ports. The driving machine according to one item.   The concave shaft portion is formed to be positioned between a lower end of the first injection port and a lower end of the second injection port when the driver blade reaches bottom dead center. The driving machine according to claim 4. A driver blade, a nose portion for guiding the driver blade and having a first injection port, a push lever arranged to be movable in the driving direction with respect to the nose portion, and a second attached to a lower end of the push lever In a driving machine provided with a contact member having an injection port of
A driving machine characterized in that a concave shaft portion having a diameter smaller than the diameter of the tip portion is formed in the vicinity of the tip portion of the driver blade guided by the first and second injection ports.   The concave shaft portion is formed to be positioned between a lower end of the first injection port and a lower end of the second injection port when the driver blade reaches bottom dead center. The driving machine according to claim 6.   The driving machine according to claim 7, wherein a taper portion whose diameter gradually increases is formed from the concave shaft portion to the tip portion of the driver blade.

Images