JPH0757484B2 - Head fall prevention method for wood cutting device and head fall prevention method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drop preventing method and a head drop preventing method for a wood cutting device, and more particularly,
This is related to safety measures when a screw is damaged.

[0002]

2. Description of the Related Art Conventionally, there is a wood cutting device described in Japanese Utility Model Laid-Open No. 61-5612 as a safety device when a screw is damaged.

In the wood cutting device described in this publication,
When the screw is damaged due to use, the support nut hits the female screw and supports the head to prevent injury to the operator and damage to the machine caused by the head falling.

[0004]

However, in the above-described wood cutting device, even if the screw is damaged and the head falls, the support nut is prevented from rotating, and therefore the lifting operation is erroneously continued. And the head goes up and down.

Due to such use, when the screw is damaged, the head falls, which is extremely dangerous in operation and damages the machine.

An object of the present invention is to provide a head drop prevention method and a head drop prevention method for a wood cutting device, which have been made to solve the above-mentioned conventional problems.

[0007]

In order to achieve the above object, in a head drop prevention method for a wood cutting device of the present invention, a table and a head are vertically contacted with each other, and a material is cut into one of them. The blade for supporting the material feeding member for transporting the material to the other, raises and lowers the head by the feeding action of the feed screw, adjusts the interval between the table and the material feeding member according to the material, and feeds the material. A wood cutting device body for feeding a material to the blade by a material member for cutting, a first female screw provided on the table side and screwed into the feed screw, and the first female screw A second female screw that is spaced from the screwing position with the feed screw and that is screwed into the feed screw and that is provided with an engaging portion, and a stopper body that engages with the engaging portion are provided. The second female screw by engaging the stopper body with the engaging portion When rotation is blocked and the first female screw is worn out of engagement with the feed screw, the second female screw drops with the feed screw and the engagement portion and the stopper body are separated from each other. The engaged state is released.

Further, in the head drop prevention method of the present invention, the table and the head are vertically contacted with each other and the head is moved up and down by the feed action of the feed screw, and the table side. A first female screw which is provided on the first screw and is screwed to the feed screw; and a first screw which is spaced from a screwing position of the first female screw and the feed screw and which is screwed to the feed screw and has an engaging portion. A second female screw and a stopper body that engages with the engaging portion are provided, and the stopper body is normally engaged with the engaging portion to prevent rotation of the second female screw. When the female screw No. 1 is worn out of engagement with the feed screw, the second female screw drops together with the feed screw to release the engagement state between the engaging portion and the stopper body. It is a thing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a wood cutting device main body, and the wood cutting device main body 1 has a table 2 and a head 3 arranged vertically. In contact with each other, a blade 4 for cutting the material is supported on one side, and a material feeding member (for example, a belt) 6 for transporting the material is supported on the other side, and the head 3 is raised and lowered by the feeding action of the feed screw 5.
The distance between the table 2 and the material feeding member 6 is adjusted according to the material, and the material feeding member 6 feeds the material to the blade 4 for cutting.

Reference numeral 7 denotes a guide, and the head 3 moves up and down along the guide 7 by the feeding action of the feed screw 5. In addition,
The feed screw 5 includes a head lifting motor 5a and a coupling 5b.
Rotate forward and backward through.

As is well known, a blade mouthpiece 8 is provided on the table 2 side, and the blade mouthpiece 8 is installed parallel to the blade 4. And, the blade 4 and the blade mouthpiece 8 have a height difference,
The thickness can be set to the thickness required for cutting the veneer.

A head 3 is provided above the table 2, and a drive roller 9 and a driven roller 10 supported by the head 3 are provided at front and rear portions of the head 3, respectively. There is.

The driving roller 9 and the driven roller 10 are in contact with the rear surface of the material feeding member 6 to transmit power. Also, 11
Is a pressure roller, and the pressure roller 11 applies a necessary pressing force to the material feeding member 6.

Reference numeral 12 is a first female screw, which is the first female screw 12
Is fixedly provided on the table 2 side by means of bolts, welding, etc., is screwed to the feed screw 5, and normally supports the weight of the head 3 via the feed screw 5. Worn internal thread 12

The second female screw 13 is separated from the screwing position between the first female screw 12 and the feed screw 5 and is screwed into the feed screw 5, and an engaging portion (for example, a recess) 14 is provided. ing.

The stopper body 15 that engages with the engaging portion 14
Is provided on the table 2 side. The stopper body 15 comprises, for example, a member having a substantially ring-shaped protrusion 15a inwardly directed and a pressing piece 15b for pressing the member (the member and the pressing piece 15b are separate members. However, they may be formed integrally.

The holding piece 15b is attached to the table 2 with a bolt 15c.
Fixed on the side. The stopper body that engages with the engaging portion 14
In order to cope with the case where the position of 15 is different from that shown in the drawing, it is provided at appropriate intervals around the member (see FIG. 3).

Normally, the stopper body 15 is engaged with the engaging portion 14 to prevent the rotation of the second female screw 13, but the first female screw 12 receives the weight of the head 3, so that the first female screw 12 receives the weight of the head 3. 1 female thread
12 wears. While the stopper body 15 is engaged with the engaging portion 14 to prevent the rotation of the second female screw 13, the second female screw
No. 13 does not receive the weight of the head 3 and is held in the initial position.

Then, after long-term use, the first female screw
When 12 is worn and disengaged from the feed screw 5, the second female screw 13 drops together with the feed screw 5, and the engagement state between the engaging portion 14 and the stopper body 15 is released.

When the engagement between the engagement portion 14 and the stopper body 15 is released, the weight of the head 3 is transferred to the second position via the feed screw 5.
Even though the feed screw 5 rotates, the second female screw 13 rotates together with the feed screw 5, and even when the feed action of the second female screw 13 continues the lifting operation. , The head 3 does not move up and down, the second female screw 13 does not wear, and the head 3
Is prevented from falling and the head 3 does not move up and down,
The operator can be made aware that some kind of failure has occurred.

Desirably, the surface on which the second female screw 13 drops and contacts (the first female screw 12 in this embodiment) is made of, for example, brass having a small friction coefficient.

Further, when the second female screw 13 is dropped together with the feed screw 5, it may be detected to display that the first female screw 12 is worn, or the head lifting mode may be displayed. -Control for forcibly stopping the switch 5a, operation switch, etc. may be incorporated.

Further, in the present embodiment, the table and the head are vertically contacted with each other, and one of the blades is used for cutting the material.
On the other hand, a material feeding member for transporting the material is supported, and the head is moved up and down by the feeding action of a feed screw to adjust the distance between the table and the material feeding member according to the material, and the material feeding member Although the wood cutting device that feeds material to the cutting tool and performs cutting has been described, the head is not limited to the wood cutting device and the table and the head are vertically contacted to each other and the head is moved by the feed action of the feed screw. It can also be applied to those that are raised and lowered.

That is, the table and the head are vertically contacted with each other and the head is moved up and down by the feed action of the feed screw, and the main body is provided on the table side and is screwed to the feed screw. A first female screw, a second female screw that is spaced apart from the screwing position of the first female screw and the feed screw and that is screwed into the feed screw and provided with an engaging portion, and the engaging portion. And a stopper body that engages with the stopper, and normally, the stopper body is engaged with the engaging portion to prevent the rotation of the second female screw, and the first female screw is worn to cause the feed screw to rotate. When the engagement with is disengaged, the head may be prevented from falling by releasing the engaging state between the engaging portion and the stopper body by dropping the second female screw together with the feed screw.

[0025]

In the method of preventing head drop of the wood cutting apparatus of the present invention, the table and the head are vertically contacted with each other, and a blade for cutting the material on one side and a material for transferring the material on the other side. A member is supported, the head is raised and lowered by the feeding action of a feed screw, the distance between the table and the material feeding member is adjusted according to the material, and the material is fed to the blade by the material feeding member. A wood cutting device body for cutting, a first female screw provided on the table side and screwed to the feed screw, and separated from a screwing position of the first female screw and the feed screw. A second female screw that is engaged with the feed screw and provided with an engaging portion and a stopper body that engages with the engaging portion are provided, and the stopper body is normally engaged with the engaging portion. Prevents the second female screw from rotating, and the first female screw wears out. When the engagement with the feed screw is disengaged, the second female screw drops together with the feed screw to release the engagement state between the engaging portion and the stopper body. Even if the elevating operation is continued by the action, the head does not move up and down, and the head is prevented from falling.

In the head drop prevention method of the present invention, the table and the head are vertically contacted with each other and the head is moved up and down by the feed action of the feed screw, and the table side. A first female screw which is provided on the first screw and is screwed to the feed screw; and a first screw which is spaced from a screwing position of the first female screw and the feed screw and which is screwed to the feed screw and has an engaging portion. A second female screw and a stopper body that engages with the engaging portion are provided, and the stopper body is normally engaged with the engaging portion to prevent rotation of the second female screw. When the female screw No. 1 is worn out of engagement with the feed screw, the second female screw drops together with the feed screw to release the engagement state between the engaging portion and the stopper body. Therefore, even if the lifting operation is continued by the feeding action of the feed screw, De will not lift, in which falling of the head is prevented.

[Brief description of drawings]

FIG. 1 is a front view of a wood cutting device showing an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional side view showing an enlarged main part of the present invention.

FIG. 3 is a schematic cross-sectional view taken along the arrow direction shown in FIG.

FIG. 4 is a schematic cross-sectional view showing an engaged state of an engaging portion and a stopper body.

FIG. 5 is a schematic cross-sectional view showing a state where the engagement between the engagement portion and the stopper body is released.

[Explanation of symbols]

 1 main body of wood cutting device 2 table 3 head 4 blade 5 feed screw 6 feeding member 12 first female screw 13 second female screw 14 engaging portion 15 stopper body

Claims (2)

[Claims] 1. A table and a head are vertically contacted with each other,
A blade for cutting the material is supported on one side, and a material-feeding member for transporting the material is supported on the other, and the head is moved up and down by the feeding action of the feed screw, and the distance between the table and the material-feeding member is adjusted to the material. A wood cutting device body that is adjusted by feeding the material to the blade by the material feeding member to perform cutting, and a first female screw that is provided on the table side and that is screwed into the feed screw. A second female screw that is spaced from the screwing position of the first female screw and the feed screw and that is screwed into the feed screw and provided with an engaging portion, and a stopper body that engages with the engaging portion. Is provided, and the stopper body is always engaged with the engaging portion to prevent rotation of the second female screw,
The second female screw drops together with the feed screw to release the engagement state between the engaging portion and the stopper body when the female screw wears out of engagement with the feed screw. A method for preventing the head from falling in a wood cutting device. 2. A main body for vertically moving the head by a feed action of a feed screw by vertically contacting the table and the head with each other, and a main body provided on the table side and screwed with the feed screw. A first female screw, a second female screw that is spaced apart from the screwing position of the first female screw and the feed screw and that is screwed into the feed screw and provided with an engaging portion, and the engaging portion. And a stopper body that engages with the stopper, and normally, the stopper body is engaged with the engaging portion to prevent the rotation of the second female screw, and the first female screw is worn to cause the feed screw to rotate. When the engagement with is disengaged, the second female screw is dropped together with the feed screw to release the engagement state between the engaging portion and the stopper body, and the head fall prevention method.