JP4534623B2 - Nose top guide device for fastener-driven tools - Google Patents

Description

  According to the present invention, fasteners such as screws and nails connected to each other are supplied into a hollow injection port formed in a nose portion, and the fastener is driven in the injection port in the direction of the distal end of the injection port by a driving force. With regard to the fastener driving tool designed to be punched out, in particular, it is slidable along the nose portion and arranged to protrude in the tip direction of the injection port in order to guide the fastener driven out from the injection port toward the material to be driven. The present invention relates to a nose top guide device for a fastener driving tool for sliding a nose top along an injection port of a nose portion.

For example, in a fastener driving tool such as a screw driving machine or a nail driving machine using compressed air as a power source, a screwdriver or a screwed nail screwdriver is engaged in a housing forming the body of the fastener driving tool. In order to drive, the drive mechanism comprised from a piston, a cylinder, etc. is accommodated. A nose portion that forms a hollow injection port for driving and guiding the fastener toward the driven material is attached below the housing, and a driver integrally coupled to the lower surface side of the piston is connected to the nose. It is slidably guided in the fastener outlet of the part. The nose portion is connected magazine for accommodating a plurality of connected fastener through the supply guide formed by a pair of guide walls opposed at a distance, the fastener supply mechanism formed in the nose portion Thus, the fasteners in the magazine are sequentially supplied into the fastener injection port via the supply guide, and the fasteners supplied into the injection port by the driver driven by the drive mechanism are directed from the injection port toward the surface to be driven. It is designed to be launched.

  In a general fastener driving tool, even when the fastener driving tool is separated from the surface of the workpiece by reaction when the fastener driving tool is activated, the tool is driven out from the tip of the injection port toward the workpiece. In order to ensure that the fastener is guided to the surface to be driven, a nose top is provided that is slidable along the nose portion in the direction in which the fastener is ejected and is disposed so as to protrude forward of the injection port of the nose portion. Yes. This nose top is normally spring-biased so as to protrude in the direction of the tip of the nose part, and is positioned at the nose part when positioning the tip of the injection port of the fastener driving tool at the place to be driven on the surface of the workpiece. It is designed to be slid along. Furthermore, a trigger mechanism for starting the fastener driving tool is formed at the base of the grip portion formed integrally with the fastener driving tool housing, and the trigger is operated by an operator holding the grip. The fastener driving tool is activated by operating the trigger mechanism by sliding the lever and the nose top.

The conventional nose top is formed in a substantially cylindrical shape with an opening formed at the center, and the outer peripheral surface of the nose portion is accommodated by accommodating the tip outer peripheral portion of the nose portion forming the injection port in the central opening. And is guided so as to be slidable along the injection port with respect to the nose portion. Furthermore, a rod whose tip extends upward is attached to one side surface of the nose top, and the upper end portion of the rod is accommodated in a rod guide hole of a contact valve formed in the nose portion. The nose top is slidably guided by the rod guide hole. When the nose top is operated, the contact valve is operated via the rod, whereby the trigger mechanism is activated to activate the tool.
JP 2003-48174 A

  The above-mentioned conventional nose top accommodates the tip of the nose portion in the opening formed at the center of the nose top and connects the rod whose upper end portion is guided by insertion into the rod guide hole to one side surface of the nose top. In this way, the nose top is slid and guided. However, in general, a fastener driving tool such as a screw tightening machine used for screwing a gypsum board, etc. Since the powder may enter between the outer peripheral surface of the nose part and the inner peripheral surface of the opening of the nose top and galvanize, the sliding operation of the nose top may be hindered, so the outer peripheral surface of the nose part and the nose top The gap between the opening and the inner peripheral surface is set large, which causes a problem that the nose top becomes loose and the operability becomes unstable.

  In general, if a guide rod for sliding and guiding the nose top is formed on the front side or both sides of the nose part, the volume on the outer peripheral side of the nose part becomes large. Occasionally, this portion comes into contact with the wall, and there arises a problem that the operability is deteriorated such that the tip of the injection port cannot be positioned near the corner unless the fastener driving tool is largely inclined.

  The present invention provides a nose top guide device that solves the above-described problems in the prior art and stably slides and guides the nose top that guides and guides the fastener to the workpiece. The task is to do.

In order to solve the above-mentioned problems, a nose top guide device for a fastener driving tool according to the present invention includes a nose part forming a hollow injection port for placing a fastener such as a screw or a nail, and a fastener in the injection port of the nose part. Fastener supply guide which is formed by a door member which is constituted by a pair of guide walls which guide and guide to the side and one guide wall is rotatably supported by a pivot shaft which is arranged along the side surface of the nose portion A driver that is propelled and driven by power such as compressed air to drive the fastener disposed in the injection port toward the tip of the injection port, and the fastener that is driven out of the injection port toward the material to be driven Fastener drive provided with a nose top that is slidably held along the nose portion at the tip of the injection port of the nose portion so as to guide and guide A contact arm in which the nose portion is slidably fitted in an opening formed at the center of the nose top and the nose top is slidably disposed along one side surface of the nose portion. And a contact shaft that guides one side surface of the nose top, and further, a pivot shaft that pivotally supports the door member is formed in parallel with the injection port, and The other side surface of the nose top is slidably supported by a shaft.

  According to the present invention, the nose portion is slidably fitted in an opening formed at the center of the nose top, and the nose top is slidably disposed along one side surface of the nose portion. A contact arm is connected to guide one side surface of the nose top by the contact arm, and a pivot shaft that pivotally supports the door member is formed in parallel with the injection port, and Since the other side surface of the nose top is slidably supported by the pivot shaft, the nose top sandwiches the injection port of the nose portion by the pivot shaft pivotally supporting the contact arm and the door member. Because it is slidably guided on both sides, even if a large gap is formed between the nose and the opening formed at the center of the nose top, the backlash of the nose top is reduced and operational feeling is reduced. It is improved. Further, since the pivot shaft formed on the fastener driving tool is used, the sliding operability of the nose top can be improved without increasing the number of parts. Furthermore, since the pivot shaft is formed on the side surface of the nose portion, the volume on the front side of the nose portion does not increase and the cornering performance does not deteriorate.

  The purpose of the present invention is to slidably slide the nose part into an opening formed at the center of the nose top, with the purpose of stably sliding and guiding the nose top for guiding and guiding the fastener to the workpiece. The nose top is connected to a contact arm that is slidably disposed along one side surface of the nose portion, and the one side surface of the nose top is guided by the contact arm. A pivot shaft that pivotally supports the door member is extended in the tip direction of the nose portion in parallel with the injection port, and the other side surface of the nose top can be slid by the pivot shaft. More specific embodiments will be described below, which are realized by supporting them.

  Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. 1 and 2 show a screw driving machine driven by compressed air as an example of a fastener driving tool in which the nose top guide device of the present invention is implemented. The screw driving machine 1 has a grip portion 3. Below the integrally formed housing 2 is attached a nose portion 4 forming a hollow injection port 5 for guiding a screw toward a workpiece. The nose portion 4 is connected to a magazine 6 for accommodating a number of connected screws, and the magazine is provided by a supply mechanism 8 formed in a supply guide 7 formed between the injection port 5 and the magazine 6. The connecting screws in 6 are sequentially supplied into the injection port 5 of the nose portion 4 along the supply guide 7.

  A cylinder 10 that slidably accommodates a piston 9 is disposed in the housing 2, and a piston 9 formed in the head of a screw is formed on the lower surface side of the piston 9 that is accommodated in the cylinder 10. A driver bit 11 that engages with the groove and rotates the screw is held. The driver bit 11 is slidably guided in an injection port 5 formed in the nose portion 4. When the compressed air is introduced into the cylinder 10, the pressure of the compressed air causes the piston 9 to move. By operating from the top dead center position of the cylinder 10 toward the bottom dead center position contacting the bumper 30 disposed in the lower part of the housing 2, the operation of the piston 9 causes the driver bit 11 to move into the injection port 5. The tip of the driver bit 11 is engaged with the head portion of the screw supplied into the injection port 5 to propel the screw toward the tip of the injection port 5.

  An air motor 12 driven by compressed air is disposed above the magazine 6, and the rotational force of the air motor 12 is held on the lower surface of the piston 9 via a speed reduction mechanism 13 composed of a plurality of gears. The driver bit 11 that is transmitted to the driver bit 11 and propelled in the injection port 5 is driven to rotate. A nose top 14 is provided at the tip of the nose portion 4 to guide and guide a screw driven out by the driver bit 11 from the injection port 5 to the surface of the material to be driven. An opening 15 concentric with the injection port 5 of the nose portion 4 is formed in the nose top 14, and a pair of upper portions pivotably supported with respect to the nose top 14 are pivotally supported in the opening 15. A guide member 16 is disposed so as to be opposed to each other, and a screw driven out from the injection port 5 of the nose portion 4 is sandwiched between the pair of guide members 16 so that the screw is perpendicular to the surface of the driven material. Guide guidance is made so that

  The lower end portion of the nose portion is loosely fitted on the upper portion of the opening 15 formed in the nose top 14, whereby the nose top 14 is held slidably along the injection port 5 with respect to the nose portion 4. In addition, by positioning the nose portion 4 of the screw driving machine 1 to the driving position of the material to be driven, the injection port 5 of the nose portion 4 is operated so that the nose top 14 is in sliding contact with the material to be driven. It protrudes further in the direction of the tip from the tip.

  A hollow air chamber 17 is formed inside the grip portion 3 formed integrally with the housing 2, and is supplied from a compressed air source via an air plug 18 attached to the rear end of the grip portion 3. The compressed air is stored. The compressed air in the air chamber 17 is supplied into the cylinder 10 through a main valve 19 formed at the upper part of the cylinder 10, thereby driving the driver 11 through the piston 9. A part of the compressed air introduced into the cylinder 10 via the main valve 19 is also supplied to the air motor 12 at the same time to drive the air motor 12 to rotate the driver 11.

  A trigger valve 20 for operating the main valve 19 and a trigger mechanism 21 for operating the trigger valve 20 to start the screwdriver 1 are formed at the base of the grip portion 3. The trigger mechanism 21 includes a trigger lever 22 operated by a finger of a hand holding the grip 3 part, and a contact arm whose upper end is disposed at the base of the trigger lever 22 and whose lower end is connected to the nose top 14. 23, the nose top 14 is pressed against the surface of the material to be driven and slid, and the trigger lever 22 disposed at the base of the grip portion 3 is moved by the operator's finger. When operated, the trigger valve 20 is operated to start the screwdriver 1. The nose top 14 has a nose part 4 loosely fitted in an opening 15 formed at the center of the nose top 14 and is operatively supported along one side surface of the nose part 4. It is slidably held along the nose portion 4 by being connected to the lower end of the.

  As shown in FIGS. 1 and 3, in the screw driving machine 1, one guide wall that forms the supply guide 7 for supplying and guiding screws from the magazine 6 into the injection port 5 has a nose portion 4. The door member 25 is pivotally supported by a pivot shaft 24 arranged in parallel to the axis of the injection port 5 on the side surface of the injection port 5 so that the door member 25 can be opened and closed. 25 is opened so that the screw at the head portion of the connecting screw can be set in the injection port 5 and in the supply mechanism 8. The pivot shaft 24 is inserted into a pair of hinge pieces 26 that are integrally formed so as to protrude from the side surface of the nose portion 4 so as to be parallel to the injection port 5 of the nose portion 4. The upper end of 24 is brought into contact with the nose portion 4 and held by the nose portion 4 by a stop ring 27 attached to the upper end portion of the pivot shaft 24. The door member 25 is rotatably supported by inserting the pivot shaft 24 through the door member 25 disposed between the pair of hinge pieces 26.

  As shown in FIGS. 3 and 4, the lower end portion of the pivot shaft 24 that pivotally supports the door member 25 is formed to extend further in the distal direction along the side surface of the nose portion 4 than the hinge piece 26. Yes. A guide piece 28 is integrally formed on the other side surface of the nose top 14 to which the contact arm 23 is not connected, and the pivot shaft is inserted into a guide hole 29 formed in the guide piece 28. By accommodating the lower end portion of 24, the other side surface of the nose top 14 is slidably guided by the pivot shaft 24.

  Prior to operating the screwing machine 1, as shown in FIG. 4, the nose top 14 is connected to a contact arm 23 that is spring-biased toward the front, so that it protrudes greatly toward the tip of the nose portion 4. It is arranged at the position. In this state, the tip end portion of the nose portion 4 is loosely fitted in the opening 15 formed in the nose top 14, and the contact arm 23 is slidably held along one side surface of the nose portion 4. By being connected, one side surface is supported, and the other side surface is inserted by inserting a pivot shaft 24 extending downward into a guide hole 29 of a guide piece 28 formed on the other side surface of the nose top 14. Since the nose top 14 is slidably supported on the center portion and both side surfaces thereof, the sliding operation can be performed stably without generating play in the nose top 14.

  Further, even when the nose top 14 is engaged with the surface of the material to be driven and is slid along the nose portion 4 in order to drive the screw, the nose top 14 is centered by the nose portion 4. Since both side surfaces are slidably supported by the contact arm 23 and the pivot shaft 24, the nose top 14 can be smoothly slid without play, and a stable screwing operation can be performed. Is possible.

  The pivot shaft 24 is connected to the nose top 14 side, the upper end thereof is extended to the hinge piece 26 side along the side surface of the nose portion 4, and the hollow guide piece 26 is accommodated in the hinge piece 26. The other side surface of the nose top 14 may be slid and guided by the pivot shaft 24.

  In the description of the above embodiment, the screw driving machine driven by compressed air has been described. However, the present invention is not limited to the screw driving machine, and drives a fastener such as a nail driving machine or a pin driving machine. It is possible to implement to the fastener drive tool which was made. Further, the present invention is not limited to a tool driven by compressed air, and can be applied to a fastener driving tool that uses electric power or combustion gas pressure.

The side view which shows the screwing machine which implemented the nose top guide apparatus of this invention Longitudinal side view of the same screwdriver as in FIG. A perspective view showing a part of the same screw driving machine as FIG. Longitudinal front view showing part of the mechanism of the screwdriver shown in the figure Same vertical front view as FIG. 5 with the nose top sliding upward

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screwing machine 4 Nose part 5 Injection port 7 Supply guide 14 Nose top 15 Opening 23 Contact arm 24 Pivot shaft 25 Door member 28 Guide piece 29 Guide hole

Claims (1)

A nose part that forms a hollow injection port where fasteners such as screws and nails are arranged, and a pair of guide walls that guide and guide the fastener into the injection port of the nose part, and one guide wall is the nose A fastener supply guide formed by a door member rotatably supported by a pivot shaft arranged along the side surface of the part, and propelled and driven by power such as compressed air, is disposed in the injection port. A screwdriver that drives the fastener toward the tip of the injection port, and a fastener driven from the injection port along the nose portion at the tip of the injection port of the nose portion so as to guide and guide the fastener toward the workpiece. In a fastener driving tool provided with a slidably held nose top, the nose portion is slidable in an opening formed in the center of the nose top. The nose top is connected to a contact arm that is slidably disposed along one side surface of the nose portion, and the one side surface of the nose top is guided by the contact arm. A pivot shaft for pivotally supporting the member is formed in parallel with the injection port, and the other side surface of the nose top is slidably supported by the pivot shaft. Nose top guide device for fastener-driven tools.

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