JPH01222874A - Mechanism for feeding fasteners in anchoring tool - Google Patents

Abstract

PURPOSE:To make it possible to feed a nail properly by a pawl section by providing the pawl section which is moved in such a way as to scribe roughly a parallelogram while travelling freely forward and backward. CONSTITUTION:When a piston rod 30 of a piston/cylinder device 28 is operated to retract a pawl section member 10, a sliding shaft 26 allows the arm section 22 of the pawl section member 10 to be moved backward first. Then, the movement allows the pawl section member 10 to be rotated around a rear fulcrum pin 38 so as to let the pawl section member come out of a feeding path for a fastener such as a nail and the like for let the member concurrently be moved backward. And when the fastener such as the nail and the like starts to be fed, the piston rod 30 of the piston/cylinder device 28 is moved to the opposite direction so that the movement allows the arm section 22 of the pawl section member 10 to be rotated around a front fulcrum pin 36. This constitution allows the pawl section member 10 to be returned to the fastener feeding path, and simultaneously to be advanced to feed the fastener. As a result, the pawl section member 10 is not engaged with the fastener at the time of retreating, but is engaged with it only at the time of advancing so as to let the fastener be pushed on one by one.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves hooking a fastener band formed by connecting fasteners such as nails with a connecting band with a nail and feeding it into the driving part of a fastener driving tool. This invention relates to improvements in the feeding mechanism of fasteners.

[Prior art and its problems]

Conventionally, in the above-mentioned type of mechanism for feeding fasteners such as nails, the nail member that is advanced by the piston cylinder device to feed the fastener, that is, the nail, engages with the succeeding nail on its return stroke, and this engagement is displaced, climbs over the nail, and moves backwards. Repeat this to return to the feed start position. At this time, the fastener band, that is, each phase, may be moved backward by the claw member, and the claw of the claw member may not be able to properly engage the next nail when feeding the next nail, resulting in incorrect nail feeding. There is.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fastener feeding mechanism in which a reciprocating pawl member can be retreated without engaging the nail at all when reciprocating to the feeding start position.

[Structure of the invention]

To achieve this object, the present invention provides an anchor driver which is mounted on a piston-cylinder arrangement and is adapted to be reciprocated thereby to drive each anchor of the anchor band into the nose section. The fastener feeding mechanism for a tool includes a claw member having a claw at its tip that engages with the fastener, and the claw member has an arm portion projecting laterally, and the arm portion is connected to the claw member. has an elongated hole having a longitudinal axis perpendicular to the longitudinal axis of the elongated hole, and a sliding shaft is installed within the elongated hole so as to be movable in the direction of the longitudinal axis;
The sliding shaft is rotatably mounted on the piston rod of the piston-cylinder device, and the claw member has two fulcrum pins spaced apart in the longitudinal direction and having both ends protruding laterally. Further, fixed guide members are provided extending parallel to and on both sides of the pawl members, each of the guide members having elongated holes extending in the longitudinal direction, into which the pawl members are inserted. fulcrum pins are positioned at each end, and a front fulcrum pin of the fulcrum pins located on the distal end side of the claw member is small enough to be movable in the width direction within the elongated hole of the guide member; On the other hand,
That is, the dimensions are such that the rear fulcrum pin cannot move in the width direction within the guide member elongated hole, but can rotate and move in the longitudinal direction of the elongated hole, and furthermore,
To provide a fastener feeding mechanism, characterized in that the two fulcrum pins of the claw member and the sliding shaft are positioned at respective vertices of a substantially triangular shape.

[For production]

According to the above configuration, when the piston rod of the piston cylinder mechanism operates to retract the claw member,
First, the sliding shaft moves the arm portion of the claw member rearward, thus giving the claw member a rotational movement about its rear fulcrum pin, and simultaneously removing the claw member from the feeding path of the fastener such as a nail and rearward. move it to When starting to feed a fastener such as a nail, the piston-cylinder device moves in the opposite direction, causing the arm portion of the claw member to rotate in the opposite direction.The claw member returns to the fastener feeding path, and the fastener is fed It will move forward for the sake of As is clear, the range of rotation of the pawl member is limited by the range of movement of its front fulcrum pin in the width direction within the elongated hole of the guide member.

[Examples] Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

The mechanism for feeding fasteners such as nails of a nailer as a fastener driving tool according to the present invention includes a claw member 10.
In the illustrated embodiment, it has an anchor band (not shown) consisting of anchors (nails in the illustrated example) having two longitudinally spaced pawls 12.14 on the underside, which pawls are connected by a connecting band. 1) to feed the nails one by one through the nail inlet 20 into the driver flade passageway 18 of the nose 16 of the nail gun.

The pawl member 10 has a pair of spaced apart arms 22 near its rear end extending transversely to its longitudinal axis, each arm 22 having a longitudinal axis perpendicular to the pawl member's longitudinal axis. It has a long hole 24 having a diameter. A sliding shaft 26 is installed in the long hole 24, and this sliding shaft is connected to the long hole 24.
It has a shape and dimensions that allow it to be moved longitudinally inside.

For example, it has flat surfaces parallel to the side surfaces, and these flat surfaces are in sliding engagement with the inner surface of the elongated hole. As best seen in FIG. 2, this sliding shaft 26 passes through a through hole 30A at the tip of the piston rod 30 of the piston-cylinder arrangement 28 located between the arm portion 22 and between the head 26A and the collar element 30. It is held so that it does not come out from the elongated hole 24. Further, the claw member 10 is constantly pressed toward the nail feeding path by a biasing spring 34 mounted around the sliding shaft 26.

The pawl member 10 further includes two longitudinally spaced forward and aft fulcrum pins 36.38 below the arm 8B22, which fulcrum pins 36.38 are attached to the pawl as best seen in FIG. They are fitted into through holes 40, 42 formed in the member 10, respectively, and both ends of each protrude from the side surface of the claw member IO. The rear fulcrum pin 38 has an annular groove 38A in its center, into which a collar element 44 is fitted, so that it is held against the claw member 10.

In the illustrated embodiment, stationary guide members 48 extend from cylinder IB46 of piston-cylinder arrangement 28 on both sides of pawl member 10 and parallel thereto, each guide member being provided with a longitudinal slot 50. Inside these elongated holes 50, both ends of the front and rear fulcrum pins 36 and 380 of the claw member 10 are located, respectively.

As best seen in FIG.
．． 38 and the sliding shaft 26 of the arm portion 22 are such that they are located at respective vertices of a substantially triangular shape. Note that the guide member 48 is connected to the cylinder portion 4.
It may be provided in a machine fixing part other than 6.

The front fulcrum pin 36 of the pawl member 10 is sized small enough to move in the width direction within the elongated hole 50 of the guide member 48, while the rear fulcrum pin 38 is sized so as to be movable in the width direction within the elongated hole 50 of the guide member 48. The dimensions are such that it cannot be moved, but can be rotated and slid along its length. In the illustrated example, the elongated hole 50 guides the front fulcrum pin 36 and rear fulcrum pin 38 of the claw member 10, but as long as both fulcrum pins 36 and 38 are guided, a notch that does not open to the outside may be used. That is, the groove may be formed in the inner wall.

In the above configuration, when the piston/cylinder device 28 is energized and the piston rod 30 is retracted, the arm portion 22 of the claw member 10 first rotates clockwise as seen in the figure via the sliding shaft 26. I am made to do so. At this time, the pawl member IO is similarly pivoted clockwise about the rear fulcrum pin 38 to remove its pawl 12,14 from the nail feed path. The amount of rotation is determined by the movement range of the front fulcrum pin 36 within the elongated hole 50 of the guide member 48 in the width direction. The pawl member then moves to the piston rod 3 while being retracted from the nail feeding path.
It is moved rearward as the rear fulcrum pin 38 moves backward, but this is caused by the sliding of the rear fulcrum pin 38 within the guide member elongated hole 50,
This is made possible by the sliding shaft 26 sliding in the elongated hole 24 of the arm portion 22 . This state is shown in the upper part of FIG. Next, the piston rod 30 of the piston cylinder device 28
starts moving forward, the arm portion 22 of the pawl member 10 is rotated counterclockwise as seen in the figure, and the pawl 12.1 of the pawl member 10 is rotated counterclockwise as seen in the figure.
4 returns into the nail feed path, and the nail member 1
0 is advanced and acts as a nail feeder. This state is the fourth
It is shown in the lower part of the figure. As can be seen in FIG. 4, in response to the operation of the piston-cylinder device 28, the pawl member 10
moves almost in a parallelogram as shown by the arrow, and does not engage the nail when retracting.

In the above embodiments, nails are used as fasteners, but it should be understood that screws or the like can also be used as fasteners, and other similar fasteners can also be used.

〔Effect of the invention〕

As described above, the claw member moves in a nearly parallelogram shape to move forward and backward, so when moving forward, it engages with a fixing device such as a nail and pushes it forward, and when retreating, it moves out of the feeding path. Since it moves backward while doing so, it never engages with the fixing device.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a fastener feeding mechanism according to the present invention. FIG. 2 is an exploded perspective view of the fastener feeding mechanism shown in FIG. 1. FIG. 3 is a partially sectional schematic side view of the fastener feeding mechanism shown in FIGS. 1 and 2. FIG. FIG. 4 is a diagram illustrating the operation of the claw member of the fastener feeding mechanism according to the present invention. In the drawings, 10...Claw member, 12.14...Claw, 16...Nose portion, 22...Arm portion, 24...
・Long hole, 26...Sliding shaft, 28...Piston/cylinder device, 30...Piston rod, 36.38...
-Fully pin, 48... Guide member, 50... Long hole. Figure 1

Claims (1)

[Claims] In the fastener feeding mechanism of the fastener driving tool, which is attached to a piston-cylinder device and reciprocated by the piston/cylinder device to send each fastener of the fastener band to the nose part, the fasteners and a claw member having an engaging claw disposed at a distal end thereof, the claw member having a laterally projecting arm portion having a longitudinal axis perpendicular to the longitudinal axis of the claw member; A sliding shaft is installed in the elongated hole so as to be movable in the longitudinal axis direction, and the sliding shaft is rotatably mounted on the piston rod of the piston cylinder device, Further, the claw member has two fulcrum pins that are spaced apart in the longitudinal direction and have both ends protruding laterally, and further provided with a fixed guide member that extends parallel to the claw member and on both sides thereof, and the guide Each of the members has an elongated hole extending in the longitudinal direction, and each end of the fulcrum pin of the claw member is located in the elongated hole of the guide member, and the end side of the claw member of the fulcrum pin is located within the elongated hole of the guide member. The dimensions are small enough that the front fulcrum pin located in the guide member can move in the width direction within the guide member elongated hole, and the other, that is, the rear fulcrum pin cannot move in the width direction within the guide member elongated hole but can rotate. The dimensions are such that the elongated hole can be moved in the longitudinal direction, and furthermore, the positional relationship between the two fulcrum pins of the claw member and the sliding shaft is approximately triangular, with one at each vertex. A fastener feeding mechanism characterized by having a positional relationship.