JPH028708Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a nail feeding mechanism disposed between the nose section and the magazine section of a nail gun configured to drive out connected nails one by one. In particular, it is possible to deal with connecting nails that are arranged in parallel and connected by connecting members and have different pitches between the nails.

``Conventional technology'' Conventionally, the nail feed mechanism of a nail gun was
No. 54-147666 is known.

As shown in FIG. 4 and FIG.
and the magazine section 3 that stores the connecting nails,
A guide wall 4A and a nail feed passage 4 formed between the door member are arranged, and the guide wall 4A is disposed within the nail feed passage 4.
A feed pawl 5 protruding from the shaft is disposed so as to be reciprocally movable along the passage 4, and by moving the feed pawl 5 forward, the nail shaft located at the tip of the connecting nail is locked by the pawl 5. and is fed into the nose hole 2A of the nose portion 2. The reciprocating stroke of the pawl 5 is determined by the stroke of a rod 8 of a feed piston 7 connected to actuate the pawl 5, and this rod 8 operates at a constant stroke pitch. There is.

The nail feeding pawl 5 has second teeth that engage with the rear edge of the second nail shaft K2 and push it toward the position of the first nail shaft K1, as shown in FIGS. 6A and 6B, for example. A first tooth is formed to control the first nail shaft K1 to be fed into the nose hole and the second nail shaft K2 to be fed into the nose hole.

``Problems to be Solved by the Invention'' By the way, there are many types of pitch dimensions between the parallel connected nails, such as the length of the nail shaft, and the pitch of each connected nail is not constant.

Therefore, as in the conventional example, the nail feeding claw 5
If the operating stroke of the nail is always constant, it will not be possible to handle connected nails with different pitches between the nails, resulting in poor nail feeding and an inability to perform accurate nailing work.

That is, at the rear end portion of the predetermined stroke of the nail feed pawl, the tip of the nail feed pawl enters the rear side of the second nail shaft and protrudes into the nose hole.

To explain this specifically, as shown in FIGS. 6A and 6B, the first tooth and the second tooth of the nail feeding pawl 5 are
They have the same length, and as mentioned above, the operating stroke of the nail feed pawl 5 is always constant. Therefore, in order to supply connecting nails connected at a predetermined connecting pitch, a nail gun that operates only with the above-mentioned stroke, as shown in FIG. The second tooth is the second nail shaft K
2 to the position of the first nail shaft K1, or it is possible for the first tooth to control that the second nail shaft K2 pops out into the nose hole 2A upon impact.

However, as shown in FIG. 6B, when using a connecting nail with a smaller connecting pitch P2 than usual, the operating stroke of the nail feeding pawl 5 is always constant and the length of the first tooth is not sufficient. The first tooth cannot lock the second nail shaft K2, so the first nail shaft K
There was a problem in that not only the first nail shaft K2 but also the second nail shaft K2 were sent out into the nose hole 2A.

Therefore, in order to be able to sufficiently deal with connected nails with different pitches between each nail, the present invention has been developed so that when the nail feeding pawl retreats when using small pitch nails, the first tooth 51 of the nail feeding pawl 5 The purpose of this invention is to prevent the nail from going over the length of two nails, and to always realize accurate nail feeding even when connecting nails of various types with different pitches between the nails.

"Means for Solving the Problems" This invention was developed to effectively solve the above technical problems, and is a nail feeding device disposed between the nose section and the magazine section of a nail gun. A guide wall protruding from the nose part, a door member arranged in parallel between the guide wall and the nail feed passage for the nail guide, and a feed piston that supports the nail feed passage along the nail feed passage. A nail feed pawl is pivotally supported at the tip of the reciprocating rod, and the nail feed pawl engages with the rear end edge of the second nail shaft in the nail feed passage to feed the second nail. a second tooth that pushes the shaft to the position of the first nail shaft, and a first tooth that loads the first nail shaft into the nose hole while controlling the protrusion of the second nail shaft into the nose hole. The tip of each tooth is rotatable around the pivot point of the tip of the rod between a position where the tip of each tooth advances onto the nail feeding path and a position where it retreats from the position, and the tip of each tooth extends onto the nail feeding path. The first tooth is always elastically biased in the direction, and the first tooth is formed so that its tip is higher than the height of the second tooth and extends away from the center of rotation of the nail feed claw. Furthermore, a first tooth relief portion is formed on the guide surface side of the door member that faces the tooth tip of the nail feeding pawl.

"Function" The present invention provides a structure in which the tips of the first tooth and the second tooth are rotatable about the pivot point between the position where they have advanced onto the nail feeding path and the position where they have retreated from there. Since the tip is higher than the height of the second tooth and extends away from the center of rotation of the nail feed pawl, the first tooth of the nail feed pawl securely holds the second nail shaft. This prevents the second nail shaft from being sent out into the nose hole together with the first nail shaft. Therefore, if the stroke is set in advance to match the large pitch, it is possible to adequately handle the feeding of connecting nails of different pitches.

"Embodiment" The present invention will be described below based on an illustrative embodiment. Note that in FIGS. 1, 2, and 3 A and B showing one embodiment, the same reference numbers as those in FIGS. 4, 5, and 6 A and B explaining the prior art are , indicating the same structural members.

In the nail gun 1, as shown in FIGS. 1 and 2, a guide wall 4A protrudes from the nose portion 2 so as to be continuous with a nail supply hole 21 formed on the back side of the nose portion 2, and an opening/closing mechanism. A nail feed passage 4 serving as a nail supply guide section is formed between the movable door member 4B, and connecting nails 6 stored in a spiral shape in a magazine (not shown) are pulled out from the outer circumferential side and sequentially inserted into the nose one by one. It can be supplied and loaded into the nose hole 2A of the section 2.

A nail feeding pawl 5 is provided protruding from the guide wall 4A side.

The nail feed pawl 5 is pivotally supported at the tip of a rod 8 which is reciprocated along the nail feed path 4 by a feed piston 7.

The nail feeding claw 5 is linearly moved in the direction of the nose section 2, that is, in the nail feeding direction, by the forward movement of the rod 8, and linearly moved in the magazine direction, that is, in the opposite direction to the nail feeding direction, by the backward movement of the rod 8. In particular, during this backward movement, the nail feeding pawl 5 is rotatable so as to avoid engagement between the nail shaft located at the second or later position of the connected nails and the nail feeding pawl 5.

Further, the tip of the nail feed pawl 5 is rotatable around the pivot point 11 of the rod tip between a position where the tip advances onto the nail feed path 4 and a position where it is retracted from the position, and the nail feed pawl 5 is rotatable around the pivot point 11 at the tip of the rod. It is constantly being energized in the direction of advancing into the world.

Further, in the nail feed claw 5, the tooth portion protruding toward the nail feed path 4 side has a first tooth 51 that is higher than the height dimension of the first tooth 52 and is spaced apart from the rotation center of the nail feed claw 5. It is formed as an extension.

That is, when the first nail shaft K2 located at the leading edge of the connecting nail 6 is sent into the nose hole 2A and nailing is performed, the tip surface 51A of the first tooth 51 is
is located in a state where the nail supply hole 21 of the nose hole 2A is shielded. At this time, as shown in FIG. 2, the movement of the second nail shaft in the return direction is regulated by the non-return claw 9, and the second nail shaft is engaged with the second teeth 52 formed on the door member 4B. It is becoming.

Therefore, when a nail driving operation is performed in the above state, pressurized air is supplied from the blowback chamber of the nail gun main body (not shown) to the front chamber 7A of the feed piston 7, and the feed piston 7 is returned to the rod. 8 will also be returned. Then, the rear end inclined surface 51B of the first tooth 51 comes into contact with the second nail shaft, and the action of the rear end inclined surface 51B causes the pivot shaft 11 with the rod 8 to be moved against the spring 10. It is rotated around the center clockwise in the figure and then moved back to the right in the figure.

This will be further explained in detail based on FIGS. 3A and 3B. In the case of a normal large connecting pitch P1, as shown in FIG. The teeth 52 feed the second nail shaft K2 to the position of the first nail shaft K1, while the first teeth 51 cause the first nail shaft K1 to pop out into the nose hole 2A and move the first nail shaft K1 to the position of the first nail shaft K1. The second nail shaft K2 sent to the position K1 is held, and the second nail shaft K2 is controlled to pop out into the nose hole 2A.

Furthermore, even when using connecting nails with a smaller connecting pitch P2 than usual, as shown in FIG. When the first tooth 51 is moved back to
The second nail shaft K2 is securely locked on the rear inclined surface 51B, and the part up to the second nail shaft K2 is the first tooth 5.
To reliably control the protrusion to the front side of 1.

By the way, when the nail feed pawl 5 moves backward and rotates, the first tooth 51 may cross the nail feed path 4 and abut against the door member 4B on the opposite side. Therefore, in the present invention, the door member 4B facing the nail feeding pawl 5, that is, the first tooth 51
The first tooth 1 is on the guide surface side facing the tooth tip.
One relief part 13 is provided.

"Effects" The present invention is capable of rotating around the pivot point between the position where the tips of the first tooth and the second tooth have advanced onto the nail feeding path and the position where they have retreated from there. Since the tip is higher than the height of the second tooth and extends away from the center of rotation of the nail feed pawl, the first tooth of the nail feed pawl securely holds the second nail shaft. This prevents the second nail shaft from being sent out into the nose hole together with the first nail shaft. Therefore, if the stroke is set in advance to match the large pitch, it is possible to adequately handle the feeding of connecting nails of different pitches.

Therefore, the present invention can easily feed different nail pitch connection nails into the nose one after another without requiring a feed piston stroke adjustment mechanism or other adjustment devices.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a nail driving machine to which the present invention is applied. FIG. 2 is a cross-sectional view of essential parts for explaining the operation of the present invention. 3A and 3B are cross-sectional views of main parts for explaining the operation of the present invention. FIGS. 4 and 5 are vertical sectional views showing a conventional example. 6A and 6B are cross-sectional views of main parts for explaining the operation of the conventional example. 1... Nailer, 2... Nose part, 21... Nail supply hole, 2A... Nose hole, 4... Nail feed passage, 4
A... Guide wall, 4B... Door member, 5... Feed claw, 51... First tooth, 52... Second tooth, 6...
... Connecting nail, 7 ... Feed piston, 11 ... Pivot point at the tip of the rod, 13 ... Relief part of the first tooth.

Claims (1)

[Scope of Claim for Utility Model Registration] A nail feeding device disposed between the nose section and the magazine section of a nailer, which includes a guide wall protruding from the nose section and a nail guide between the guide wall. a nail feed pawl pivotally supported at the tip of a rod that is reciprocated along the nail feed path by a feed piston; The feed pawl includes a second tooth that engages with the rear end edge of the second nail shaft in the nail feeding passage to push the second nail shaft to the position of the first nail shaft; and a first tooth for loading the first nail shaft into the nose hole while controlling the protrusion of the first nail shaft into the nose hole, and a position where the tip of each tooth advances onto the nail feeding path and a position where it retreats from there. The first tooth is rotatable around the pivot point of the tip of the rod, and is always elastically biased in the direction of advancing onto the nail feeding path; is formed to be higher than the height of the second tooth and extend away from the rotation center of the nail feed pawl, and further on the guide surface side of the door member facing the tooth tip of the nail feed pawl. A nail feeding device for a nail gun, characterized in that a relief portion is formed for the first tooth.