JPH0650138Y2 - Door latch mechanism of nailer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a nail driving method in which connecting nails housed in a magazine are sequentially supplied into an injection opening formed in a nose, and the nail is driven from the injection opening toward a workpiece. With regard to the machine, in particular, a door member that constitutes one side wall of the nail feeding path between the outlet of the magazine and the nail ejection opening of the nose is placed in a closed position with respect to a fixed guide wall portion that constitutes the other side wall of the feeding path. The present invention relates to a door latch mechanism for fixing.

(Prior art and its problems) For example, as disclosed in Japanese Utility Model Publication No. 61-7902, a connecting nail in which a large number of nails are connected with their shafts parallel to each other is housed in a magazine, and the connecting nail is In the nail driving machine configured to be drawn out from the outlet of the magazine and sequentially supplied to the ejection opening of the nose portion, a nail guide path is formed for supplying and guiding the nail between the ejection opening of the magazine and the ejection opening. The nail guide path is formed integrally with the nose portion and forms a wall surface on one side of the guide path that extends to the outlet of the magazine, and the fixed guide is pivotally supported by a part of the nose portion. It is configured by a door member that is configured to come into contact with and separate from a wall.

As shown in FIG. 5, a latch mechanism for fixing the door member in the closed position in the prior art described above has a latch pin 31 which is spring-biased in a protruding direction at an end of the door member 30 apart from the shaft supporting portion. The door member 30 is provided so as to be retractable, and the tip 32 of the latch pin 31 is fitted into the latch hole 35 of the engaging portion 34 formed to project from the fixed guide wall 33 portion so that the door member 30 is fixed to the fixed guide wall 33. It is fixed in the closed state so that the fixed guide wall and the opposing wall surface of the door member form the nail feed path 36.

By the way, the outer diameter of the latch pin 32 and the inner diameter of the latch hole 35 are set to be larger in the latch hole 35, and rattling of the slidable support portion of the latch pin 31 with respect to the door member 30 is caused. As a result, there is a backlash at the closed position of the door member, and the interval between the nail feeding paths 36 is not constant.

Usually, on the fixed guide wall side and the door side, there are arranged a nail feeding pawl that projects into the nail guide passage and engages with the nail shaft portion to supply a nail, and a check claw that prevents the nail from going backward. The nails are configured to be sequentially supplied by engaging the nail shaft of the nail in the feeding path. However, when the width of the nail feeding path is wider than usual as described above, The nails may not be able to engage with the nail shaft, and the nails may not be supplied.

In addition, the rattling also occurs due to wear due to the use of the tool, and there is also a phenomenon in which the above-mentioned supply failure occurs due to long-term use even if the tool is normally operating at first.

(Technical Problem of the Invention) The present invention solves the above problems in the prior art, and the gap size between the door member and the fixed guide wall can be maintained constant for a long period of time without depending on the dimensional accuracy of the latch member and the like. An object of the present invention is to provide a nailing machine equipped with a door latch mechanism that can open and close the door with a simple operation that is completely the same as the conventional one.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a contact surface between the door member and the fixed guide wall to maintain a constant distance between the door member and the fixed guide wall. A latch member that can be engaged with is swingably supported, and the rotational biasing force applied to the latch member pushes the door member in the direction in which the abutting surface abuts against the fixed guide wall to keep the gap between them. It is designed to be fixed and maintained constant.

Further, in order to open and close the door member by exactly the same operation as the conventional latch mechanism, the above-mentioned latch member is further slidably supported, and an operating member which abuts on this latch member and gives a biasing force. The latch member can be engaged and disengaged by operating the operating member separately.

(Advantageous effects of the invention) The door member is provided with a latch member that can slide and swing freely,
By biasing the latch member through the operating member by the spring, the latch pin of the latch member can be engaged with the latch hole formed on the fixed guide wall side. Therefore, the action of the latch member in the rotating direction causes the latch pin to move. By pressing the inner peripheral edge of the latch hole, the door member is pressed and fixed to the fixed guide wall side in the closed state. As a result, the contact surface formed between the door member side and the fixed guide wall side allows the gap between the fixed guide wall and the door member, that is, the width of the nail supply path, to be constantly maintained.

Therefore, it is possible to provide a nailing machine in which a stable supply of nails can be performed due to the processing precision of the latch mechanism portion, wear during use, and the like.

Further, by operating the operating member in exactly the same manner as the conventional latch mechanism, the engagement between the latch pin of the latch member and the latch hole of the fixed guide wall can be released to release the door member. It is possible to avoid extra troublesomeness at the time of loading.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a main body of a nailing machine incorporating a striking mechanism for striking a nail with impact, and a lower part of the main body 1 having a nose 2 formed with an injection port for receiving a nail hit by the striking mechanism. Is provided. Reference numeral 3 denotes a magazine fixed to the main body, and is configured to be capable of accommodating a wound body of connecting nails in which a large number of nails are connected in parallel.

A nail feed path 4 is formed between the magazine 3 and the nose 2 to guide the connecting nail pulled out from the outlet of the magazine 3 to the ejection opening of the nose 2.

The nail feed path 4 is formed integrally with the nose 2 and extends from a side portion of the ejection port to a position near the outlet of the magazine 3, and is arranged to face the fixed guide wall 5. It is composed of a door member 6. The door member 6 is supported at one end thereof by a shaft 9 on a bearing portion 8 formed on a side portion of the nose member 2 so as to be openable and closable. The door member 6 is fixed near the other end of the door member 6 with the fixed guide wall 5
A latch mechanism 10 for fixing the engaging piece 12 formed integrally from the side in the closed position is provided. Further, a contact portion 11 is formed at the end portion so as to contact with the fixed guide wall 5 side and maintain a constant gap between the door member and the fixed guide wall.

The latch mechanism 10 will be described in more detail. A cylindrical accommodation recess 13 is formed near the other end of the door member 6, and a groove formed on the side surface of the recess is formed in the accommodation recess 13.
An operation member 16 having an operation lever 15 exposed to the outside via 14 is slidably accommodated. A compression spring 17 is interposed between the operating member 16 and the bottom of the accommodating concave portion 13, whereby the operating member 16 is constantly urged upward in FIG. A pair of flanges 18 that are continuous with the edges of the grooves 14 are formed in the upper portion of the accommodation recess 13, and are supported by a support shaft 20 that is inserted into an elongated hole 19 formed in the flange 18. A latch member 21 is provided.

As shown in detail in FIGS. 2 (a) and 3, the latch member 21 is formed at an opening 22 supported by the support shaft 20 and at an end apart from the opening 22 and has a fixed guide. Wall 5
Latch pin 23 engageable with a latch hole 25 formed in the engaging piece 12 on the side, and a hook portion 24 formed below the latch pin 23.
Are formed respectively.

The upper end surface 16a of the operating member 16 is in contact with the lower end surface 23a of the latch pin 23 of the latch member 21, and the latch member 21 is always in the upward direction by the action of the compression spring 17 acting on the operating member 16. It is urged to rotate counterclockwise around the support shaft 20. A protrusion 26 that is engageable with the hook 24 is formed adjacent to the upper end surface 16a of the operating member 16, and the protrusion 26 is formed when the operating member 16 is operated downward by the operating lever 15 in the figure. Engages with the hook portion 24 to pull the latch member 21 downward.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.
FIG. 4a shows the state of the door member 6 and the fixed guide wall portion 5 which are released when the nailer is loaded with the nails. The operation member 16 pushes up the latch member 21 by the action of the compression spring 17 until the support shaft 20 hits the upper end of the elongated hole 19 of the flange 18, and further rotates the latch member 21 counterclockwise in the figure about the support shaft 20. I am letting you.

By moving the door member 6 in the closing direction, the tip of the latch pin 23 of the latch member 21 engages with the inclined surface 12a of the engaging piece 12 formed by protruding from the fixed guide wall 5, and the inclined surface 12a causes the latch member 23 to move. 21 is pushed down. The latch member 21 pushes the operating member 16 downward against the compression spring 17. (FIG. 4b) When the door member 6 reaches the closed position, the latch pin 23 engages with the engaging piece.
Aligning with the latch hole 25 formed in 12, the latch member 21 is pushed upward again by the action of the compression spring 17 via the operating member 16, and the latch pin 23 is inserted into the latch hole 25. When the support shaft 20 supporting the latch member 21 comes into contact with the upper end edge of the long hole 19, the upward movement of the latch member 21 is stopped, but the operation member 16 is pushed up so that the support member 20 is attached to the latch member 21. As a result, the latch pin 23 presses the peripheral edge of the latch hole 25 to press the door member 6 toward the fixed guide wall 5 side. The abutting portion 11 formed between the door member 6 and the fixed guide wall 5 abuts to maintain a constant gap therebetween. (FIG. 4c) To open the door member 6, the operation lever 15 of the operation member 16 is pushed down to operate the operation member.
16 moves downward, and the projection 26 and the latch member 21 of this operating member
The hook portion (24) is engaged to pull down the latch member (21).
As a result, the latch pin 23 comes out of the latch hole 25 and the door member 6 can be opened. At this time, the pressing force of the latch pin 23 against the peripheral edge of the latch hole 25 is completely released, so that the operation can be performed without any change from the conventional mechanism. (Fig. 4d)

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a nailing machine adopting a latch mechanism of the present invention, FIG. 2a is a side view showing a latch member which is a main part of the latch mechanism of the present invention, and FIG. 2b is the same. FIG. 3 is a side view showing the operating member, FIG. 3 is a perspective view of the latch member, and FIG. 4 is a sectional view showing an operating state of the embodiment of the invention, in which a is a door open state, b is a door closing transition state, and c is a door. The closed state and d show the door opening operation state, respectively. FIG. 5 shows a conventional door latch mechanism. 2 ... Nose, 5 ... Fixed guide wall 6 ... Door member, 10 ... Latch mechanism 16 ... Operating member, 21 ... Latch member 23 ... Latch pin, 24 ... Hook part 25 ... Latch hole, 26 ...... Projection

Front page continuation (72) Inventor Michiaki Adachi 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Inventor Ichiro Ikenohara 6-6 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo Max Co., Ltd. (72) Inventor Noboru Ishikawa 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Inventor Yoichi Kimura 6-6 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo Max Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A magazine for accommodating a large number of connected nails, a nose member having an injection opening for receiving the leading nail of the nails pulled out from the magazine, and a nail arranged in the injection opening to be processed. A main body portion having a built-in impact mechanism for striking toward the material, a fixed guide wall which is formed integrally with the nose member and constitutes one side wall of a nail feeding path from the injection opening of the nose member to the magazine, and one end In a nailing machine provided with a door member that is openably and closably supported by the nose member on the side and constitutes the other side wall of the nail feeding path, a gap between the door member and the fixed guide wall is provided between the two. A latch member having a contact surface for maintaining constant and having a latch pin engageable with the fixed guide wall side is slidable in the engaging / disengaging direction in the vicinity of the other end side of the door member. Nail feeding It is provided so as to be swingable about an axis parallel to the surface, and has an operating portion exposed to the outside, and is spring-biased so as to contact the latch member and slide and rotate the latch member. Door latch mechanism, comprising: