JP2000202784A - Structure of preventing elutriation of nail in nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a nail from springing out while ensuring the function of preventing the nail from springing out and not resisting nail feed even in the case where a short nail is particularly hit in a nailing machine in which the nail is hit and hit out by a driver by downwardly moving a piston by a compression air. SOLUTION: A nail attitude restriction block 21 is provided with a springing out prevention wall portion functioning as a wall portion closing a portion of a nail throwing port of a driver guide 2. A nail contacting surface 23 contacted with the nails n-n in a nail feed passage 11a of the nail attitude restriction block 21 is formed to a flat surface along a nail feeding direction. Since the nail contact surface is flat, a resistance of nail feed can be outstandingly reduced in comparison with the conventional case where an L-shaped projection exists.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a nail from protruding in a nail driving machine.

[0002]

2. Description of the Related Art Generally, in order to feed a plurality of connecting nails, each of which is formed by connecting a number of nails, one by one to an ejection path on the inner peripheral side of a driver guide, a nail feeding passage of a nail magazine is provided in the driver guide. A nail input port is provided for communicating with the exit path of the driver guide. In order to accommodate nails of several lengths, the length of the nail insertion port is set in the nail axis direction (the nail driving direction) in accordance with the longest nail. For this reason, the nail slot becomes unnecessarily long for a short nail. If the nail insertion port is longer than necessary than the nail shaft length, the nail will be ejected from the exit at the tip of the driver guide because the driver will not be able to strike the nail with a short nail and the posture will not be stable. In some cases, the nail could jump out from the lower part of the nail slot in front of it. In the following description, “protruding a nail” refers to a state in which the nail protrudes from the lower part of the nail input port to the outside in the middle of the injection path leading to the injection port, rather than the normal state of being driven out of the injection port. .

Conventionally, in order to solve this problem, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 50-147978, a nail is prevented from projecting in a range approximately half below the nail input port in the axial direction of the nail. A technique of providing a wall portion (protrusion prevention wall) for performing the operation is known. This conventional pop-out prevention wall 50
As shown in FIG. 4, on the floor side of the nail feed passage 51 (the substrate 52 side of the nail feeder), it is rotatable up and down via a support shaft 53, A block body 54 is provided in a state of being biased by a spring.
L-shaped projecting inside. The protrusion preventing wall 50 closes almost half of the lower side of the nail insertion port 57 as a part of the wall of the driver guide 58, so that when a short nail n is hit, the nail n moves outside from the nail insertion port 57. It was able to prevent jumping out.

[0004]

However, according to the above-mentioned conventional pop-out preventing wall 50, when a long nail n is fed, the tip of the long nail n interferes with the pop-out preventing wall 50 protruding into the nail feed passage 51 in an L-shape. Therefore, it is necessary to feed the long nail n while retreating the pop-out preventing wall 50 from the nail feed passage 51 against the spring urging force 56, and this causes a problem that the nail is not smoothly fed. .

Further, since the block body 54 is provided on the substrate 52 side in a spring-biased state, when the connecting nail N is set along the substrate 52, a part of the connecting nail N There is a problem that the connecting nail N is hard to be set at this point because it gets up and rises from the substrate 52. Regarding this problem, although not shown in the drawings, as disclosed in, for example, Japanese Unexamined Utility Model Publication No. 54-48484, a block body having a protrusion prevention wall is not provided on the substrate 52 side but on the substrate 52 as described above. This problem can be solved by providing a configuration in which the door is provided on the door side of the nail feed passage that is provided so as to be able to open and close. However, in the case of the latter protrusion prevention structure, the protrusion prevention wall is provided in the nail feed passage so as to protrude in an L-shape. The present invention has been made in order to solve these problems of the conventional pop-out prevention structure, and the original function (a nail pop-out prevention function of preventing a short nail from popping out by closing a part of a nail insertion port). It is an object of the present invention to provide a protrusion preventing structure which does not hinder smooth nail feeding and does not hinder the setting of a connecting nail.

[0006]

For this reason, the present invention provides a projecting prevention structure having the structure described in the claims. According to the structure for preventing the nail from popping out, the nail posture regulating block functions as a wall for closing a part of the nail input port, so that the nail is prevented from being protruded from the nail input port. It is reliably ejected from the tip (injection port) of the injection path. In addition, since the nail contact surface of the nail posture regulating block is formed on a flat surface along the nail feeding direction, the resistance in the nail feeding direction due to the contact of the nail with the nail contact surface is higher than in the past. As a result, the nail feeding can be performed smoothly, so that the defective nail feeding can be greatly reduced as compared with the related art.

[0007]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows the periphery of a nail feeder 10 of a nail driver. In the figure, reference numeral 1 indicates a main body of the nailing machine. In the figure, only a part of the lower end side of the main body 1 is shown. Although not shown, the body 1 is provided with a nail driving cylinder and a piston, and a nail driving driver is attached to the piston. The piston and the driver are moved downward by the compressed air supplied to the main body 1, and the nail is hit from the injection port by hitting the head of the nail with the tip of the driver. The driver is guided so as to be able to move up and down on the inner peripheral side of a driver guide 2 provided in a projecting manner from the lower surface of the main body 1. A contact arm 3 is mounted on the outer peripheral side of the driver guide 2 so as to be vertically movable. The upward movement of the contact arm 3 enables the operation of pulling the trigger on the main body 1 side.

The inner peripheral side of the driver guide 2 (injection path 2
One nail is thrown into a), which is hit by the driver as described above. The nail is inserted into the injection path 2a through a nail insertion port 4 formed in a predetermined range along the axial direction of the driver guide 2. The nail feeder 10 is connected to the nail input port 4. On the right side of the nail feeder 10 in the figure, a nail magazine 6 for loading a connecting nail connecting a number of nails is attached. Nail feeder 10
Has a substrate 11 and a door 12 which is opened and closed with respect to the substrate. The door 12 is rotatably supported by a driver guide 2 via a support shaft 13. The gap between the substrate 11 and the door 12 forms a nail feed passage 11a for feeding the connecting nail N.

The nail magazine 6 has a cylindrical shape and has a structure divided into a receiving frame 6a and a lid frame 6b along the axial direction, and the receiving frame 6a is attached to the substrate 11 side. The lid frame 6b is attached to the receiving frame 6a so as to be openable and closable. FIG. 1 shows a state where the lid frame 6b (not shown in FIG. 1) of the nail magazine 6 is opened and the door 12 of the nail feeder 10 is opened. A nail head guide groove 11b is formed on the upper surface of the substrate 11 along its upper edge. The heads of the nails n to n of the connecting nail N fit into the nail head guide grooves 11b, and the connecting nail is positioned in the nail axis direction. Regardless of the length of the nail to be fed, the head is guided by the nail head guide groove 11b. Therefore, the position of the tip is different between a long nail and a short nail. This will be described later.

Next, as shown in FIG. 2 and FIG.
A nail feed cylinder 14 is attached to the back side of the unit 1. The nail feed cylinder 14 is operated by the compressed air supplied to the main body 1. That is, the upper piston chamber 14a of the nail feed cylinder 14 (the chamber on the left side of the piston 15 in FIGS. 2 and 3) serves as a return air chamber of the main body 1 (a chamber for supplying compressed air to the lower piston chamber of the main body side cylinder). ). On the other hand, a compression spring 16 is interposed in the lower piston chamber 14b of the nail feed cylinder 14.

A nail feed claw 18 is attached to the tip side of the piston rod 17 of the nail feed cylinder 14 via a support shaft 17a so as to be vertically rotatable. This nail feed claw 1
At the tip of 8, there are formed two claw portions 18a and 18b at predetermined intervals in the nail axis direction. As the nail feed claw 18 rotates up and down with the reciprocation of the piston rod 17, both claw portions 18a and 18b move to the upper surface side of the substrate 11 through the windows 11d and 11d formed in the substrate 11. Appear and disappear. As shown in FIG. 1, the interval between the nail portions 18a and 18b in the nail axis direction (vertical direction in the drawing) is set to the shortest nail that can be driven by the nailing machine. That is, the claw 1 on the upper side of the figure is attached to the head side of the shortest nail.
8a is engaged, and the lower claw portion 18b is engaged with the tip of the nail, so that the nail is always engaged by the upper and lower claw portions 18a, 18b regardless of the length. I have.

On the main body 1 side, when the piston moves downward and nailing is performed, compressed air is supplied to the return air chamber, whereby compressed air is supplied to the piston upper chamber 14a of the nail feed cylinder 14, Therefore, the piston 15 and the piston rod 17 retreat against the compression spring 16.
When the piston rod 17 is retracted, the nail feed claw 18
Revolves downward while rotating downward, and is displaced rearward by one nail with respect to the connecting nail N. As shown in FIG. 1, non-return claws 19, 19 are disposed in the vicinity of the two claws 18a, 18b in a spring-biased state. Is prevented from displacing the connecting nail N in the counter feed direction. By releasing the nailing operation (pulling operation of the trigger), the piston in the main body 1 is turned upward by the compressed air in the return air chamber. When the piston moves upward, the air pressure in the return air chamber decreases, so that the piston 15 and the piston rod 17 of the nail feed cylinder 14 advance by the compression spring 16. In the stage where the piston rod 17 advances, the nail feeding claw 18 protrudes toward the upper surface side of the base plate 11 and is hooked on each nail n of the connecting nail N. Sent to the side. By repeating this operation in conjunction with the nailing operation of the main body 1, the nails n of the connecting nails N are inserted one by one into the nail input port 4.
Send to

Next, on the inner side of the door 12, there is provided a nail position regulating block 21 for correcting a particularly short nail driving position during nail driving. The nail posture regulating block 21 is supported rotatably in the vertical direction (vertical direction in FIGS. 2 and 3) via a support shaft 21a. The nail position regulating block 21 is urged by a compression spring 22 in a direction to rotate downward. As shown in FIG. 2, when the compression spring 22 is rotated downward by the urging force, the tip of the rotation of the nail posture regulating block 21 protrudes into the nail feed passage 11a, and a relief recess provided on the upper surface of the substrate 11. 11e contacts the bottom surface. The state shown in FIG. 2, that is, the tip of the nail posture regulating block 21 is a relief recess 11 e
Is in contact with the bottom surface of the nail feed passage 1 as shown in the figure.
When the connecting nail N does not exist in 1a (including the case where only the last nail n exists in the injection path 2a), and because the connecting nail N set is short, the tip of the nail n It occurs when there is no interference. On the other hand, when the long connecting nail N is set in the nail feeding passage 11a as shown in FIG. 3, the nail posture regulating block 21 is opposed to the compression spring 22 by the distal end side of the connecting nail N. In this state, the tip of the nail posture regulating block 21 is pressed against the connecting nail N by the urging force of the compression spring 22.

A nail contact surface 23 on the side of the nail feed passage 11a and a projection preventing wall 24 facing the nail insertion port 4 are provided at the tip end of the rotation of the nail posture regulating block 21. The nail contact surface 23 is connected to the connecting nail N (long nail n ~) in the nail feeding passage 11a.
n), the nail contact surface 23 is formed as a substantially flat surface so as not to cause the resistance of the nail feeding as shown in the figure, and the L-shaped is formed on the side of the nail feeding passage 11a as in the prior art. No protruding part is provided. The nail contact surface 23 may be formed to have a substantially flat surface as described above, or may be formed in a smooth arc shape. In this specification, the “flat surface” refers to a block body 54 as in the related art. Refers to a smooth flat or curved surface that does not have a shape that resists nail feeding of the connecting nail N because it is bent into an L-shape.

As shown in FIG. 2, the nail position regulating block 21 rotates toward the nail feed passage 11a so that the nail contact surface 23 is formed on the bottom surface of the relief recess 11e on the substrate 11 side. In the contact state, the upper side in the figure is inclined in a direction to be displaced toward the anti-nail feeding side (the right side in the figure).
The lower end of the nail posture regulating block 21 is regulated by the stopper projection 25 interfering with the step 12a on the door 12 side. FIG. 2 shows a state in which the nail position regulating block 21 is located at the lower rotation end (the stopper protrusion 2).
5 is in contact with the step 12a).

According to the protrusion preventing structure constructed as described above, the nail contact surface 23 of the nail position regulating block 21 is formed on a substantially flat surface along the nail feeding direction. Is in contact with the connecting nail N, the resistance of the nail position regulating block 21 to the nail feeding resistance is greatly reduced as compared with the conventional configuration.

The protrusion preventing wall 24 is in a state where the nail position regulating block 21 is rotated toward the nail feed passage 11a and the nail contact surface 23 is in contact with the bottom surface of the relief recess 11e on the substrate 11 side. In FIG. 2, since the upper side is inclined toward the anti-nail feeding side, when the tip of the nail n comes into contact with the protrusion preventing wall 24 at the time of nailing, the nail posture regulating block 21 includes the inclined surface of the protrusion preventing wall 24. (See FIG. 2), an external force for rotating the nail in the counterclockwise direction in FIG.
An external force in the direction of pressing against the bottom surface of 1e is applied. As a result, the nail posture regulating block 21 moves the nail feed passage 11a.
To prevent the nail from escaping in the direction of withdrawing from the upper side (upward in the figure), so that the nail position preventing block 21 can reliably exhibit the nail pop-out preventing function.

Further, the distal end of the nail posture regulating block 21 fits into the relief recess 11e on the substrate 6a side. According to this, the tip of the nail n that has been hit is prevented from sneaking into the lower side of the nail posture regulating block 21, thereby also preventing the nail posture regulating block 21 from escaping and ensuring its nail pop-out prevention function. Can be demonstrated.

Further, the nail posture regulating block 21 is
Since it is attached to the side, it is particularly easy to set the connecting nails N of the long nails n to n in the nail feed passage 11a. That is, when the block body 54 for preventing the nail from popping out is provided on the substrate 52 side of the nail feed passage as disclosed in the Japanese Utility Model Laid-Open No. 50-147978, the compression spring 56 As a result, the block body 54 protrudes into the nail feed passage 51, so that the set connecting nail N
It rises from 2. However, according to the illustrated nail protrusion prevention structure, the nail posture regulating block 21
Is attached to the door 12 side, so that when the door 12 is opened and the connecting nail N is set on the substrate 11 side, the nail position regulating block 21 does not interfere.

Further, the posture of the long nail n when the last nail n of the connecting nail N is driven out can be stabilized by the pop-out preventing wall portion 24. Nail feeding claw 1
The interval between the upper and lower claw portions 18a, 18b of 8 is set in accordance with a short nail. For this reason, when feeding a long nail, the position of the tip of the nail tends to be unstable. Also, connecting nail N
In the case of the last nail, the posture is particularly unstable because it is not connected to the next nail by a connecting material such as a wire.
However, according to the protrusion prevention structure of the present embodiment, the protrusion prevention wall 24 closes the lower part of the nail insertion port 4 and functions as the wall of the driver guide 2, so that the tip of the last nail of the connection nail can be securely connected to the driver. The nail can be positioned on the inner peripheral side of the guide 2, thereby stabilizing the launching posture of the last nail.

The embodiment described above can be implemented with various changes. For example, although the configuration in which the nail posture regulating block 21 is provided so as to be vertically rotatable via the support shaft 21a is illustrated, the nail posture regulating block may be configured to be supported so as to be vertically movable in parallel.

The relief recess 11e may be provided as needed. Further, although the configuration in which the protrusion prevention wall 24 is inclined in a certain direction has been exemplified, the protrusion prevention wall 24 may be formed in an arc shape or a flat surface orthogonal to the nail feeding direction.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a side view of a nail feeder with a door opened.

FIG. 2 is a sectional view taken along a nail feeding direction of the nail feeding device. This drawing shows a state in which no connecting nail is present in the nail feed passage, and as a result, the nail posture regulating block protrudes into the nail feed passage.

FIG. 3 is a sectional view taken along a nail feeding direction of the nail feeding device. This drawing shows a state in which a connecting nail having a long nail length is set in the nail feeding passage, and as a result, the nail posture regulating block has retreated from the nail feeding passage.

FIG. 4 is a longitudinal sectional view of a conventional nail pop-out prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Nail driver main body 2 ... Driver guide, 2a ... Injection path 4 ... Nail insertion port, 6 ... Nail magazine 10 ... Nail feeder 11 ... Substrate (floor surface of nail feed passage) 11a ... Nail feed passage, 11e ... Release Concave part 12 ... Door 14 ... Nail feeding cylinder 15 ... Piston, 16 ... Compression spring 18 ... Nail feeding claw, 18a, 18b ... Claw part 21 ... Nail posture regulating block, 23 ... Nail contact surface 24 ... Protrusion prevention wall part N ... Connection Nail 50: Conventional pop-out prevention wall

Claims (1)

[Claims] 1. A nail position regulating block is provided on a door side for opening and closing a nail feed path so as to be able to protrude and retract into the nail feed path, and the nail position restricting block is protruded into the nail feed path to form the nail feed path. A nail opening functioning as a wall that closes a part of a nail insertion port for communicating the nail with an injection path for nail driving, wherein the nail in the nail feed passage of the nail attitude regulating block is A nail pop-out preventing structure for a nailing machine in which a contacting nail contact surface is formed in a flat surface along a nail feeding direction.