JPS6136326Y2 - - 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, a known technique is to drill a hole in the inner diameter of the spindle and incorporate a smaller spindle in 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 independently.

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 solved, 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. The part of the log that was bitten by the chuck is separated from the log by being rubbed, and when the specified cutting process is completed and the log is removed from the chuck, the part of the log that was bitten by the chuck is 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 were not removable, the only option was to burn them off on site using oxygen-acetylene melting, 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 embodiment, the spindle is a parent-child type double spindle (in which a small spindle is built into the inner diameter of a large spindle).

Reference numeral 1 denotes a large spindle, which is normally supported by a veneer race frame via bearings, etc., and is configured to be able to move forward and backward in the direction of arrow A by engaging, for example, a fluid pressure cylinder or the like (not shown). Reference numeral 2 denotes a perforated inner diameter portion of the large spindle, and a small spindle (not shown) that matches this inner diameter is inserted through the portion 2 and can be moved forward and backward by another means such as a fluid cylinder. Reference numeral 3 denotes a bearing pusher made of gunmetal or the like that is fitted on the tip 5 side of the large spindle 1, and is also provided on the other side of the large spindle 1 to pivotally support the small spindle. 4 is a male thread provided on the outer peripheral surface of the spindle tip 5 side. The outer diameter of the spindle 1 increases in two steps from the point where the male thread 4 ends, and the rear end surface of a chuck 11, which will be described later, is in contact with the side surface 7 of the stepped portion of different diameters.

Reference numeral 11 denotes a chuck, and a plurality of sharp claws 12 are planted at the tip facing the end surface of the log. The inner diameter of the spindle 1 increases in inner diameter by one stage toward the rear end, and a female thread 14 is cut in the smallest diameter part to be screwed into the male thread 4 at the tip of the spindle 1. From the terminal end of the threaded portion 14, the inner diameter increases one step further, and the threaded portion 14 is loosely fitted onto the outer circumferential surface 8 of the spindle with a small gap. 13 is a relief portion of the female thread portion. In the above configuration, when the chuck 11 is screwed into the male thread at the tip of the spindle and the screw is fully tightened, the rear end of the chuck will come into contact with the side surface 7 of the stepped portion of the spindle 1 without any gap. The spindle and chuck are butted together. Next, in this state, the key 26 is embedded in the key grooves 6 and 16, which are bored in common on the outer peripheral surface of the spindle 1 and the outer peripheral surface of the chuck 11, as shown in FIG. 2, straddling the abutting portion. . The key groove is formed by scribing a key of a predetermined width with the chuck closed and milling the groove. It is preferable to use a mounting key 26 that has been processed in advance to match the keys 6 and 16 in the width direction correctly. Furthermore, it is desirable to secure the mounting key 26 to the spindle 1 using a countersunk vault 27 in order to prevent it from falling off due to spindle rotation.

Based on the above configuration, since the chuck and the spindle are engaged and fixed by the mounting key, the key 26
As long as the chuck 11 does not break due to shearing force, the chuck 11 does not dig into the spindle 1 more than necessary. Therefore, it is extremely easy to put the screw back in when replacing the chuck, and maintenance is also simplified.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of one embodiment, and FIG. 2 is a plan view. 1...Spindle, 3...Bearing pusher, 4,
14...Screw part, 6, 16...Keyway, 11...
Chuck, 12...claw, 26...installation key.

Claims (1)

[Claims for Utility Model Registration] 1. In a veneer lace for turning a veneer veneer from raw wood, a spindle having a threaded portion on the outer periphery of one end of the raw wood is installed so as to be able to approach or separate from the end face of the raw wood, and the spindle A veneer lace chuck device comprising: a chuck that is screwed into the tip of the chuck; and a locking key extending between the rear end of the chuck and the tip of the spindle. 2. The veneer lace chuck device according to claim 1 or 2, wherein the locking key is fixed to the tip of the spindle with a countersunk bolt.