JPH01280502A - Operation method of double spindle type veneer lathe - Google Patents

Abstract

PURPOSE:To prevent a part of material wood from damaging, by a method wherein a holding claw part of the tip of a small spindle is positioned more inward than a holding claw part of the tip of a large spindle during a period from the first stage to the middle stage of driving with the large spindle. CONSTITUTION:The title lathe is constituted so that a holding claw part 2a of the tip of a small spindle is capable of setting more inward than a holding claw part 3a of the tip of a large spindle and the holding claw part 2a of the tip of the small spindle is positioned more inward than the holding claw 3a of the tip of the large spindle up to the middle stage from the first stage of driving with the large spindle 3. At the last stage of driving with the large spindle 3, the holding claw part 2a of the tip of the small spindle is displaced outward, holding of material wood 1 with the holding claw part 2a is started and then continuous turning is performed while releasing the holding of the material wood 1 with the large spindle 3. Even if inconvenience where the large spindle and material wood are turned relatively is generated, probability where a part of the material wood is damaged together is low and transmission of driving force of only the next small spindle is performed favorably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a double spindle veneer race.

Conventionally, in veneer lace, double spindles are often used, consisting of a pair of left and right large spindles, each with a built-in small spindle that cannot rotate relative to each other. It was said to be a convenient device for turning large-diameter logs down to small diameters.

However, the existing double spindle type veneer lace,
As illustrated in FIG. 3, mechanically, the gripping claw part 2a at the tip of the small spindle is inserted into the large spindle 3 only to the same position as the gripping claw part 3a at the tip of the large spindle, and the gripping claw part 2a at the tip of the small spindle is only inserted into the large spindle 3 to the same position as the gripping claw part 3a at the tip of the large spindle. In this case, since the operation mode is such that the gripping claw 2a at the tip of the small spindle is press-fitted into the log 1 to the same position as the gripping claw 3a at the tip of the large spindle, the turning process from the initial stage to the middle stage of driving by the large spindle 3 is Then, there is the disadvantage that the large spindle 3 and the log l rotate relative to each other, that is,
If the core of the log is damaged, the portion of the tip of the small spindle that comes into contact with the gripping claw 2a will also be damaged, so the drive of the large spindle 3 is canceled and only the small spindle 2 is started. At this time, the transmission of driving force became impossible, and log 1
This causes the inconvenience that it becomes impossible to turn the material to a small diameter.

On the other hand, conventionally, when releasing the grip of the log by the large spindle in order to start driving only the small spindle,
Since the operation mode is such that the left and right sides are simultaneously released while turning continues, the degree of deflection of the log and small spindle changes rapidly as the turning is released.

Since the raw wood is significantly displaced relative to the lead plate equipped with a cutting knife, etc., the thickness of the veneer to be cut may become locally uneven.

In order to prevent or significantly suppress the occurrence of the above-mentioned inconveniences or malfunctions, the present invention has been developed to improve the double spindle and to develop a suitable operating method. 4I so that the gripping claw at the tip of the spindle can be sunk inward than the gripping claw at the tip of the large spindle.
At the same time, the gripping claw at the tip of the small spindle is positioned inward from the gripping claw at the tip of the large spindle during the initial to middle stages of driving by the large spindle, and the gripping claw at the tip of the small spindle is positioned inward from the gripping claw at the tip of the large spindle during the initial to middle stages of driving by the large spindle. An operating method characterized by displacing the claws outward (hereinafter referred to as the first operating method for convenience) and releasing the grip of the log by a pair of left and right large spindles prior to driving only the small spindle, respectively. We propose a driving method (hereinafter referred to as the second driving method for convenience) that is characterized by performing the left and right driving methods separately at different times.

According to the first operating method, even if the large spindle and the log rotate relative to each other during the turning process from the initial stage to the middle stage when the large spindle is driven, the gripping claw at the tip of the large spindle Since the gripping claw at the tip of the small spindle is located inward, the probability that the corresponding local part of the log will be damaged is extremely low, and the driving force can be transmitted to the next small spindle alone, allowing the log to be gripped as desired. This is effective because it allows turning to a small diameter, and according to the second operating method, the large spindle releases the grip of the log on the left and right sides at different times, so the degree of deflection of the log and small spindle can be controlled. Since there is no sudden change and the displacement of the raw wood relative to the lead white is only slight, it is possible to successively cut veneers with a similar thickness, making it effective.

The present invention will be described in more detail below along with embodiments illustrated in the drawings.

1 and 2 are process cross-sectional explanatory diagrams for explaining the first operating method, and the first operating method according to the present invention, as illustrated in FIG. The gripping claw part 2a of the large spindle is configured so that it can sink inwardly than the gripping claw part 3a of the tip of the large spindle. , the gripping claw part 3 at the tip of the large spindle
a, and at the end of the drive by the large spindle 3, the gripping claw 2a at the tip of the small spindle is displaced outward (toward the log 1 side), and the gripping claw 2a starts gripping the log l. Then, as illustrated in FIG. 2, while releasing the grip of the log 1 by the large spindle 3.

Turning is performed continuously.

According to such an operating method, even if there is an inconvenience in which the large spindle and the log rotate relative to each other during the turning process from the initial stage to the middle stage when the large spindle is driven, it is possible to Since the gripping claw at the tip of the small spindle is located at the position, there is a very low probability that the corresponding part of the log will be damaged at the same time, and the driving force can be transmitted to the next small spindle only, allowing the log to be made into a small diameter as desired. It is effective because it can be turned.

In addition, it is desirable that the gripping claw at the tip of the small spindle during the initial to middle stages of driving by the large spindle should be recessed inward to the extent that it does not come into contact with the raw wood, as exemplified in the above embodiment, but it is preferable that the gripping claw part is recessed inward to the extent that it does not come into contact with the raw wood. Of course, even if it is only a small amount, there is no problem in practical use.

For the convenience of accurately setting the gripping position of the log, an operation mode is used in which the log is temporarily gripped with the small spindle, then gripped again with the large spindle, the small spindle is sunk at the desired position t, and then driving by the large spindle is started. There is no problem in taking .

4 to 6 are process front explanatory diagrams for explaining the second operating method, and the second operating method according to the present invention consists of a pair of left and right When turning logs 11 using a double spindle in which each of the large spindles 13 has a small spindle 12 that cannot rotate relative to each other, prior to driving only the small spindles 12, as illustrated in FIG. First, the grip of the log 11 by either the left or right large spindle 13 is released, and turning is continued for an appropriate period of time.

As illustrated in FIG. 6, the large spindle 13 on the remaining side
The grip of the raw wood 11 is released, and the drive of only the small spindle 12 is started to perform continuous turning.

According to the above-mentioned operating method, the left and right sides of the log are released by the large spindle at different times, so the degree of deflection of the log and the small spindle changes more easily than when the left and right sides are released at the same time as in the past. Since there is little displacement of the raw wood relative to the lead white, it is possible to continuously cut a veneer with a similar thickness, which is effective.

Of course, the above-mentioned operating method is reasonably effective when used in conjunction with the conventional operating method in which both the large spindle and the small spindle are used to grip the log from the beginning. It will be even more effective if it is used in conjunction with the driving method.

Note that if the left and right position of the log changes as a result of releasing the grip on the large spindle, this will cause problems in the marking process, etc., so when releasing the grip on the log by one of the large spindles, first It is desirable to fix the position of the small spindle in the double spindle, or to set it so that the gripping force of the small spindle and the gripping force of the other double spindle are balanced to the extent that the left and right position of the log does not change. When releasing the grip of the log by the large spindle on one side of the log, the gripping force of the small spindle within the large spindle and the gripping force of the small spindle already gripping the log are
It is desirable to set the balance so that the left and right positions of the logs do not change.

The diameters of the large spindles may be set to be the same as in the above embodiment, but if necessary, as illustrated in FIG. 7, the diameter of the large spindle 23 to be released first may be set to Either set the diameter of each large spindle 13 to be larger than that of the remaining large spindles 13, or set the diameter of each large spindle 13 to be the same as illustrated in FIG. Chuck 3 with a somewhat thicker diameter
3, and each large spindle releases the grip on the log.
It is also possible to perform the process at intervals corresponding to the diameter.

As is clear from the above, according to the present invention, it is possible to turn logs into a small diameter better than before while preventing or significantly suppressing the occurrence of inconveniences or defects in the cutting process, which is effective, and has no effect on the industry. The effects of implementing the present invention are extremely large.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIGS. 1 and 2 are process cross-sectional explanatory diagrams for explaining the first operating method, and FIG. 3 is for explaining the conventional operating method. 4 to 6 are process front explanatory views for explaining the second operating method, and FIGS. 7 to 8 are front views of other embodiments of the second operating method. It is an explanatory diagram. 1.11・φ・Log, 2.12-・・Small spindle, 2
No. a - Small spindle gripping claw, 3.13, 23.-
・Large spindle, 3a@...Large spindle gripping claw,
33... Chuck patent applicant Meinan Seisakusho Co., Ltd. Figure 1 Figure 8 Figure 4

Claims (1)

[Claims] 1. When turning logs using a veneer race equipped with a double spindle, each of which has a pair of left and right large spindles built-in a small spindle that cannot rotate relative to each other, the gripping claw at the tip of the small spindle The structure is such that it can be sunk inward from the gripping claw at the tip of the spindle, and the gripping claw at the tip of the small spindle is configured to sink inward from the gripping claw at the tip of the large spindle from the initial to middle stages of driving by the large spindle. A method of operating a double spindle type veneer race characterized by displacing the gripping claw at the tip of the small spindle outward at the end of positioning and driving by the large spindle. 2. When turning logs using a veneer race equipped with a double spindle in which each of the left and right large spindles has a built-in small spindle that cannot rotate relative to each other, the log is gripped by the left and right large spindles prior to driving only the small spindles. A method of operating a double spindle type veneer lace characterized by releasing the right and left sides separately at different times.