JPS6136325Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a veneer race that turns a wide veneer veneer while rotating the log. This relates to the installation of chucks that hold the left and right end surfaces of raw wood when peeling off a thin veneer veneer by cutting a cutting blade into the surface by a predetermined amount.

In conventional veneer laces, the spindle is usually capable of moving back and forth in the axial direction of the log, depending on the length of the log used, loading the log, and removing the tapered core log after cutting. The spindle can be moved forward and backward by engaging a hydraulic cylinder or other fluid cylinder with the spindle, or by moving the left and right spindles independently, or by moving only one side of the left or right spindle. There is something. Furthermore, there is a known technique in which a hole is drilled in the inner diameter of the spindle and a small spindle that is thinner is built into the pocket of the spindle so that the large spindle on the outer periphery and the small spindle in the pocket can be advanced and retreated separately.

By the way, the veneer lace actually grips the raw wood log as a raw material, because each spindle has a sharp claw at its tip on one side facing the log side, which is convenient for gripping and rotating the log. The chucks planted with are locked, the chucks are strongly bitten into the left and right end faces of the raw wood, and the chucks are gripped and rotated to cut the veneer veneer just like peeling the skin of an apple. . The first problem here is how to securely lock the relationship between the spindle and the chuck, and various ideas have been tried. In actual veneer lace, the power for rotating the log (rotating the log via a spindle and a chuck) is usually
Because it exceeds 100 HP and the outer surface of the log is irregular,
The load on the spindle and chuck when cutting a veneer until the cross section of the log becomes a perfect circle is extremely large and impactful, and therefore even the slightest play (gap or looseness) between the chuck and spindle becomes more and more severe. As wear progresses, the engagement between the spindle and the chuck becomes incomplete, and the smooth transmission of rotational force from the raw wood becomes unstable.
However, this solution was quickly solved by screwing the chuck and spindle together. As soon as the first problem was resolved, a second bottleneck arose. In other words, the engagement between the chuck and the spindle can be achieved by machining male and female threads on each other and screwing in with a female thread whose inner diameter matches the thread groove on the outer circumferential surface of the spindle. The only option is to cut the screws in a way that tightens freely in the direction of rotation of the log. On the other hand, if you screw in the direction of loosening, the screw will loosen at certain points.
At the end of the process, the chuck falls off the spindle. The chuck, which is tightened and attached to the spindle, continues to rotate logs and cut veneer veneer without any problems. To explain how the chuck of veneer lace is used, the center of the left and right end surfaces of the raw wood are
The wood is often soft and weak, especially recent punky logs and low-grade logs used for cost reduction purposes. Also, even if the log is of good quality, the chuck is bitten into the center of the log, and in order to overcome the cutting resistance and rotate, a lot of load is applied to the center of the log, and sometimes the woody part at the center of the log is damaged. After being rubbed, the part of the chuck that has been bitten by the chuck will be separated from the log, and when the specified cutting process is completed and the log is removed from the chuck, the part of the log that has been bitten by the chuck will be firmly pushed between the chuck's claws. They are left behind. For this reason, before chucking the next log, the operator uses a chisel-like tool with a sharp tip, a hammer, etc. to dig up and remove the remaining log chips that have been firmly bitten into the chuck. As a result, the chuck gradually wears out, and naturally it must be replaced with a new chuck at an appropriate time, but at this time the second problem occurs. As mentioned above, the chuck has a high horsepower of over 100HP for rotating logs, and is strongly tightened at the threaded part of the spindle at all times, making it almost impossible to remove it. Since 70 to 80% of the chucks are not removable, the only option was to burn them off on site using oxygen, acetylene, etc. This invention focuses on this point and solves the problem in an extremely simple manner. It is.

This will be explained below with reference to the drawings.

FIG. 1 is a side sectional view of an embodiment of the present invention.
In this example, the spindle is a parent-child type (a small spindle is built into the inner diameter of a large spindle).
It shows a double spindle.

Reference numeral 1 denotes a large spindle, which is normally supported by a veneer race frame with bearings or the like, and is capable of moving forward and backward in the direction of arrow A by engaging, for example, a fluid pressure cylinder or the like (not shown). Furthermore, the large spindle 1 is configured as a hollow shaft in the case of a double spindle,
A small spindle (not shown) is inserted into the inner diameter portion 2 via a pusher 3 so as to be movable forward and backward. Further, the large spindle has a male thread 5 cut on the tip end 6 side facing the log side, and further has a step part 5 where the outer diameter becomes thicker. 3 is a pusher made of gun metal or the like for supporting the small spindle fixed to the tip side of the large spindle. 11 is chuck,
A plurality of sharp claws 12 are implanted at its tip. A female screw 13 that is screwed into the screw 5 at the tip of the large spindle 1 is cut toward the inner diameter side. 1
5 is a relief part of the screw groove 13. Reference numeral 21 denotes a mounting ring which, as shown in FIG. 2, has a V-shaped groove 22 formed on its outer circumferential surface and is loosely fitted into the stepped portion 4 of the large spindle 1.

As shown in FIG. 2, the mounting ring 21 has an inner diameter portion 24 that loosely fits into the stepped portion 4 of the large spindle 1, and an inner diameter portion 23 with a gap between the stepped portion 4. It is mounted in a ring shape on the stepped portion of the spindle 1. Therefore, the chuck 11 is tightly fastened to the tip of the spindle via the mounting ring 22 by the female and male screws 13 and 5 screwed together. Of course, the screw direction mentioned above is configured such that it can be tightened easily with respect to the rotation of the log. With the above attachment, the spindle is advanced and the claws 12 of the chuck 11 are bitten into the left and right end faces of the log, thereby rotatably cutting the log.

Next, when replacing the chuck, attaching ring 2
By cutting the circumference of the V-shaped groove 1 with oxygen-acetylene, etc., there is a slight gap between the chuck 11, which had been firmly tightened with screws during cutting of the raw wood, and the side surface of the stepped portion 4 of the spindle 1. Therefore, the tightening stress on the side surface of the stepped portion of the chuck 11 is dispersed in a cloud, and the screws 5 to 1 between the spindle and the chuck are easily tightened.
You can unscrew the 3-piece chuck and replace it with a new chuck.

The mounting ring 21 is usually made of iron, but it may also be made of non-metallic material such as reinforced plastic.In short, the mounting ring 21 can be removed by breaking it when replacing the chuck, or it can be removed with a iron saw or the like. Any material that leaves a slight gap when cut is fine. Alternatively, a part of the ring may be made of a highly fusible alloy or the like, and when the chuck is removed, the ring is heated and melted to create a gap.

By using the extremely simple means described above, maintenance such as chuck replacement can be completed in a short period of time.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of one embodiment, and FIG. 2 is a partially detailed view of the mounting ring. 1...Large spindle, 4...Step part, 6...Male thread part, 11...Chuck, 18...Claw part, 13
...Female thread part, 21...Mounting ring.

Claims (1)

[Claim for Utility Model Registration] 1. In a veneer lace for turning a veneer veneer from raw wood, a spindle having a threaded portion at one end and a stepped portion on the outer circumferential surface approaches or separates from the butt end surface of the raw wood. A veneer lace chuck device comprising: a chuck which can be installed freely and screwed onto the tip of the spindle; and a thin mounting ring fitted between the rear end of the chuck and the stepped portion of the spindle. 2. The veneer lace chuck device according to claim 1 of the utility model registration, characterized in that the mounting ring has a groove formed on its outer circumferential surface. 3. The veneer lace chuck device according to claim 1 or 2 of the utility model registration claim, wherein the mounting ring is made of a metal material. 4. The chuck device for veneer lace according to claim 1 or 2 of the utility model registration claim, wherein the mounting ring is made of a hard non-metallic material. 5. The veneer lace chuck device according to claim 1 or 2, wherein a part of the mounting ring is made of a highly fusible metal.