JPS6222322Y2 - - Google Patents

Description

[Detailed description of the invention] Generally, a cut groove is formed on the surface of a veneer veneer (hereinafter referred to as a veneer) with a knife, and thread is embedded in the cut groove (adhesive may also be used) to strengthen it. Alternatively, when joining, the kerf is formed in the direction that cuts the fibers of the veneer, that is, in the direction perpendicular to the fibers of the veneer, so it is necessary to apply a large cutting force or holding force to the knife and the veneer while forming the kerf. There is.

As a device for this purpose, for example,
As in Publication No. 125083 (veneer thread insertion device), a part of the circumferential surface of a rotating roll is used as a veneer transport path, and the veneer is pressed onto the circumferential surface in a curved manner in a direction perpendicular to its fibers. Two pressurized endless bands are arranged to allow the thread to be transferred while the thread is being transferred, and a cutter is provided between the two pressurized endless bands to form a cut groove in the veneer and to embed the thread. There is.

However, in such a device, it is not determined at which position on the pressurized endless band that is pressed against the veneer, the feeding force against the resistance force for forming the kerf on the veneer is applied. If most of the feeding force is applied from a distant position at the top in the veneer transport direction, the veneer will be pulled and stretched, which will promote cracking of the veneer and cause it to break, and tension will be applied to the threads, causing thread breakage.
On the other hand, if most of the feeding force is applied from a far away position, the veneer will be compressed over a long range in the conveying direction, causing problems such as the veneer buckling and tearing, and blade jamming. . This phenomenon is especially likely to occur if there is a partial thickness unevenness in the veneer.
At a thicker part, the force of pressure contact with the rotating roll becomes large, and the frictional force, that is, the feeding force, becomes large, and when this part is conveyed on the lower side of the cutter, the veneer is compressed, and then the veneer is compressed. If it comes to the lower side, the veneer will be stretched, causing the problem described above.

Therefore, in order to solve the above-mentioned problem, the present invention aims to install the threading knife near the area where the veneer is pressed between the pair of rolls (the position where the circumferential surfaces of both rolls are close to each other), and also close to the rolls. In this case, the position where the feeding force is applied to the veneer and the point where the kerf is formed are substantially the same fixed position.

The present invention will be explained below based on the illustrated embodiments.

1 and 2 are a pair of rolls that pinch and feed veneer 3 that has gone through various processes, such as veneer cut to size or untreated veneer cut with veneer lace, from both the front and back sides. , the sized veneer 3 is conveyed so that its cut surfaces are in close contact and can be laterally stripped.

Although not shown, appropriate drive devices are connected to the upper roll 1 in the embodiment shown in FIGS. 1 and 2, and to the lower roll 2 in the embodiment shown in FIGS. 4 and 5. , the veneer 3 is configured to be transportable in a direction perpendicular to its fibers.

A thread inserting knife 4 is provided in close proximity to the pair of rolls 1 and 2, with a cutting blade 4a facing the same.

Therefore, in the present invention, a continuous gap is provided in the rotational direction of the roll, for example, a groove 5 in the rotational direction is formed in the roll on the side where the thread inserting knife 4 is provided, or the axis of the roll is separated. , the lower roll 2 as shown in Figures 1, 2 and 3.
In the former case, the roll 2 is constructed by substantially disposing a large number of pulleys on a shaft 6 via bearings 7 at appropriate intervals. still,
The central bearing 7a is used as a bending support for the thread inserting knife 4.

Further, as shown in FIG. 3, the thread insertion knife 4 has a cutting edge 4a whose tip is formed into a flat shape, and a thread outlet hole 4b is formed so that the surface serves as an outlet for the thread 8. Furthermore, the cutting blade 4a of the thread inserting knife 4 is
The veneer 3 is made to protrude from the surface of the lower roll 2 to the desired depth to form the kerf 9 into the veneer 3.
It is sloped from the loading side to the loading side.

Further, as is clear from the figure, since the thread inserting knife 4 is provided in the groove 5 close to the roll 2 side, the cutting edge 4a is located at the position where the veneer 3 is pinched between the rolls 1 and 2, that is, the veneer. This can be made to almost coincide with the position where the feeding force is applied to No. 3.

Note that the cutting blade 4a may be located slightly on the unloading side from the clamping position as long as the veneer 3 does not buckle due to the cutting resistance of the cutting blade 4a.For example, if the diameter of the rolls 1 and 2 is As the size increases, the allowable range becomes larger.

On the other hand, the interval between the parts of both rolls 1 and 2 that pinch the veneer 3 is made slightly narrower than the thickness of the veneer 3, and the veneer 3 is
For example, it is preferable to attach a spring or a cylinder to the shaft of the upper roll 1 so that pressure can be applied in accordance with the uneven thickness of the upper roll 1. (Illustration omitted) In the figure, 8a is a veneer 3 formed by a thread inserting knife 4.
This is a thread buried in the cut groove 9 of

In addition, in FIGS. 4 and 5, the roll on the side where the threading knife is provided is not one roll as in the previous embodiment, but
This is an embodiment in which the shaft core is separated and a gap is provided that is continuous in the rotation direction, an end face is formed on the roll, and a threading knife 4 is provided close to the end face.
Although the figure shows a part of the thread inserting knife 4, it is usually arranged at least at two or more locations so that the thread is buried on the left and right sides of the veneer 3.

Further, when the thread inserting knife 4 is provided on the upper roll 1, a rotating body 1' such as a bearing is used, which is fitted onto the pin 10, and the pin 10 is fixed to the holder 11.

Furthermore, a collar 10a is formed on the other end of the pin 10 so that the cutting edge 4a of the thread inserting knife 4 is located close to the roll 1 side, and the thread inserting knife 4 is fixed to this collar 10a.

In addition, the lower roll 2 has a high frictional force with the veneer 3 and the thread 8
It is best to cover it with urethane rubber or the like to prevent tension from being applied to it.

For example, the present invention is constructed as described above, and the thread 8 is passed through the lead-out hole 4b formed in the thread inserting knife 4, and the veneer 3 is passed between the rolls 1 and 2, so that the cutting blade 4a can cut the veneer. The thread 8 is buried in the cut groove 9 while the cut groove 9 is formed in the cut groove 3.

The position where the feeding force is applied to the veneer 3 relative to the position where the kerf 9 is formed by the thread inserting knife 4 is the position where the veneer 3 is clamped by the rolls 1 and 2.
As a result, the position where the cutting groove 9 is formed and the position where the feed force is applied to the veneer 3 are approximately the same in the veneer transport direction, and even if there are partial thickness irregularities in the veneer, the position where the feed force is applied to the veneer 3 remains a fixed position that does not change either forward or backward in the veneer transport direction from the point where the veneer 3 is clamped by the rolls 1 and 2.

Therefore, the problems of conventional devices, such as the cracking of the veneer being promoted and tension being applied to the threads, causing thread breakage, or conversely, buckling of the veneer, resulting in blade jamming, can be solved.

In addition, if the cutting blade of the thread inserting knife is flat, the thread can be buried while being pressed into the cutting groove, and the cutting groove can be completely sealed from above as the cutting blade passes through, allowing the thread to pass through the cutting groove. There are also characteristics that are difficult to expose.

As described above, the present invention has the above-mentioned effects and has high practical value.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory cross-sectional view, FIG. 2 is an explanatory cross-sectional view taken along line A-A in FIG.
The figure is a partial cross-sectional explanatory diagram of another embodiment, and FIG.
It is a front explanatory view of a partially cut away part of the figure. 1, 2... Roll, 3... Single plate, 4... Thread inserting knife, 4a... Cutting blade, 4b... Output hole, 5...
Groove formed in roll 2, 8... Yarn, 9...
kerf.

Claims (1)

[Scope of utility model registration request] A pair of rolls is provided to pinch the veneer veneer and convey it in a direction perpendicular to the fibers, and from one side of the roll, a cutting blade of an appropriately shaped shape and a thread outlet hole at the tip thereof are used to cut the veneer. A thread inserting device is provided with a thread inserting knife that forms a groove and embeds the thread in the cut groove, wherein the roll on the side provided with the thread inserting knife is provided with a gap portion continuous in the rotational direction, and the A veneer veneer thread inserting device characterized by being equipped with a cutting blade of a thread inserting knife.