JPH07115328B2 - Cutting method of raw wood in veneer lace - Google Patents

Description

The present invention relates to a method for cutting raw wood in veneer lace.

Conventionally, when cutting raw wood in veneer lace, it is well known that the cutting surface is roughened due to the properties of the raw wood, etc., especially near the knots and bumps, and at significant intersections. The rough deterioration of the grain part is remarkable, and once the rough surface appears, the probability that it will appear repeatedly at almost the same position is extremely high, but in any case, the rough cutting surface is the quality of veneer. Is a factor that significantly deteriorates.

As a means for suppressing the deterioration of the roughening of the cutting surface, theoretically, the pressing force of the entire pressure bar (pressure bar) that presses the vicinity of the boundary between the raw wood and the veneer is set to be larger than a normal value described later. However, in practice, good cutting itself becomes difficult, which is not necessarily appropriate and is not practical.

That is, when the pressure of the entire pressure bar is set to be larger than the normal value, it is necessary to prevent the misalignment of the raw wood,
Not only is a large log holding force required, but because the resistance increases due to the pressure bar, a large driving force must be supplied to the log inevitably. Since the load continues to be applied, the inconvenience that the raw wood is damaged is very often caused, and the inconvenience that the raw wood bends due to the reduction in diameter and the thickness of the veneer is uneven is also caused. It becomes difficult to make a good cut.

Therefore, normally, the pressing force of the pressure bar is limited to a value that does not cause the inconveniences and problems described above, and the cutting is performed while silently recognizing the local roughening of the cutting surface. It was the actual situation, which was an adverse effect in the veneer cutting process.

The present invention was developed to eliminate the drawbacks of the conventional cutting methods described above, and provides a cutting method that is well adapted to the properties of the raw wood so that the raw wood can be satisfactorily cut, and a simple cutting method is provided. It is intended to improve the quality of the plate.Specifically, the pressure bar of veneer lace is divided into multiple parts so that the pressing force can be adjusted separately and the roughness of the cutting surface of the raw wood ( Roughness) is detected by a detection mechanism, and when the roughness exceeds an arbitrary limit value, at least the roughness of the cutting surface exceeds an arbitrary limit value based on a detection signal from the detection mechanism. This is a cutting method in which the pressing force of the pressurizing bar corresponding to the position is increased from a normal value to improve the cutting surface after the cutting and to perform cutting continuously.

According to such a cutting method, when the roughness of the cutting surface exceeds an arbitrary limit value, at least the pressing force of the pressure bar corresponding to the position of the rough surface increases from the normal value. The deterioration of the cutting surface is suppressed, and the cutting surface after polishing is improved, and the increase in the pressing force is applied to the rough surface that appears near the node, etc. Since it is carried out locally by the bar, it can be slightly increased as compared with the usual case, and there is little possibility of causing the inconveniences and problems as described above, and good cutting can be carried out generally.

Hereinafter, the present invention will be described in more detail with an example of the embodiment illustrated in the drawings.

FIG. 1 is a side view of an apparatus applied to implement a cutting method according to the present invention.

In the figure, reference numeral 1 denotes a plurality of divided pressure bars which are held by a pressure bar base 2 so as to be elastically displaceable, each of which is formed in a single plate in a close contact manner or at appropriate intervals. The cutting tools 3 are arranged along the cutting edge of the cutting tool 3, and in the cutting process, the vicinity of the boundary between the raw wood 4 and the veneer 5 is pressed with a predetermined pressing force (normal value).

Reference numeral 6 denotes a plurality of strain gauges that are combined with the divided pressure bar 1 to form a detection mechanism, and are embedded or attached to each of the pressure bars 1, and the roughness of the cutting surface of the raw wood 1 is shown. The strain amount of each pressurizing bar 1 which varies with the change of is measured.

Reference numeral 7 denotes a control device, which receives the measured value of the strain amount of each pressure bar 1 from the strain gauge 6 and, in other words, each time the measured value exceeds an arbitrary limit value, in other words, the strain gauge 6
Is controlled so that the pressure increasing mechanism 8 to be described later is temporarily operated only during a period in which the measured value exceeds an arbitrary limit value.

Reference numeral 8 denotes a plurality of pressure increasing mechanisms composed of fluid cylinders and the like that are provided alongside each pressure bar 1, and the control device 7
Based on the control of 1., the pressure bar 1 corresponding to the position where the measured value of the strain gauge 6 exceeds an arbitrary limit value is temporarily pressed in the direction of the arrow in the drawing to increase the pressing force above the normal value. .

The cutting method according to the present invention is carried out, for example, by using the apparatus having the above-described structure. In the process of rotating the raw wood 4 in the direction of the arrow shown in the drawing to grind the veneer 5, the cutting surface of the raw wood 1 is cut. Is good, the strain amount of each pressurizing bar 1 is substantially constant at a normal value corresponding to a predetermined pressing force, and the measured value by the strain gauge 6 does not exceed an arbitrary limit value.
The pressing force of any of the pressure bars 1 is not increased, and the normal cutting is performed.

On the other hand, if, for example, the cutting surface near the joint deteriorates and the strain amount measured by the strain gauge 6 attached to the pressure bar 1 corresponding to the portion exceeds an arbitrary limit value, the pressure bar Since the control device 7 operates the pressure increasing mechanism 8 corresponding to 1 to increase the pressing force of the pressurizing bar 1, the deterioration of the cutting surface is suppressed and the cutting surface after the cutting is improved. However, since the increase of the pressing force is locally performed on the exposed rough surface, it may be slightly increased as compared with the usual case, and there are problems such as damage of the raw wood or uneven veneer thickness. It is effective because it is less likely to be caused and good cutting can be performed as a whole.

Since the outer peripheral side of the raw wood (the front side of the veneer) tends to be roughened in a hollow shape, the limit value of the strain amount should be set on the side where the elastic displacement of the pressure bar decreases to detect the strain. It is desirable to make an appropriate adjustment, and if it is set in this way, the pressing force of the pressure bar can be increased even if the outer periphery of the unformed raw tree does not normally contact the pressure bar at the beginning of cutting. However, it is also effective in that it is possible to suppress the rough deterioration caused by the lack of the initial pressing force that has been conventionally induced.

Further, as in the above-mentioned embodiment, if a detection mechanism is constituted by a pressure bar and a strain gauge, and it is possible to detect the roughness of the cutting surface at a position very close to the cutting edge of the single plate cutting blade, In addition to the direct detection of the roughness of the cut surface, if the cutting surface that is currently being cut is significantly deteriorated with the veneer cutting tool, the veneer (including the boundary with the log) ), The pressure applied to the pressure bar can be increased based on the detection signal to suppress the progress (expansion) of the remarkable coarse deterioration. Is.

In addition, it is not always optimal because a general cutting tool for single plate cutting is usually re-polished and repeatedly used, but as described above, other detection that can detect rough deterioration of the cutting surface during cutting As the mechanism, although not shown, a plurality of strain gauges are embedded or attached in the vicinity of the blade edge of the blade for cutting a single plate, and a detection mechanism having a configuration for measuring the amount of strain near the blade edge can also be mentioned.
When applied, the strain gauge is preferably provided on the back side of the blade so that it can be relocated, or, for example, as disclosed in "Cutting device for veneer race" (Japanese Patent Publication No. 52-9876).
It is also practical to embed or attach a plurality of strain gauges to a so-called replaceable blade type single plate cutting blade.

However, the detection mechanism is not limited to the detection mechanism having a configuration capable of detecting the deterioration of the cutting surface during cutting as described above. For example, as illustrated in FIG. 2, a photoelectric switch, a micro switch, a differential switch, or the like. It consists of a transformer, etc., and consists of an appropriate number of sensors 9 for detecting the roughness of the outer peripheral surface of the raw wood 4 in contact or non-contact, and screws, hydraulic equipment, etc. for moving the single plate cutting blade 3. A follow-up movement mechanism (not shown) that follows and moves the sensor 9 in the centripetal direction of the log 4.
Even if the detection mechanism has a structure that detects the roughness of the already cut cutting surface, it is extremely likely that the rough surface repeatedly appears at almost the same position as described above. It is sufficiently useful as a signal source that emits a signal for suppressing rough deterioration during cutting, and can be applied to the implementation of the cutting method according to the present invention.

Furthermore, if necessary, it is also effective to use both types of detection mechanisms in combination, or the specific number of detection positions by the detection mechanism can be set to be larger than the number of pressure bar divisions. , It is also useful to improve the detection accuracy, but in any case,
The limit value of the roughness of the cutting surface may be arbitrarily set according to the application of the veneer, and it is convenient if the control device or the like has a built-in mechanism capable of varying the allowable limit value.

On the other hand, the shape or holding form of the pressure bar is not limited to the example shown in FIG. 1, but is supported by the pressure bar base 2 via the pin 12 as shown in FIG. 2, for example. A rocking type pressure bar 11 for pressing the vicinity of the boundary between the log 4 and the veneer 5 in accordance with the rocking force of the rocking mechanism 10 in accordance with the operation of the rocking mechanism 10 including a fluid cylinder. Or a so-called roller bar as disclosed in, for example, "Veneer lace" (Japanese Patent Publication No. 54-17996), "Veneer lace" (Japanese Patent Publication No. 56-16729), and a comb. Even if the parts are externally connected to each other like a shape, the point is that it is substantially divided into a plurality of parts, and if the pressurizing force is adjustable for each, it does not matter if the shape and There is no particular restriction on the holding form or the number of divisions.

Further, the means for increasing the pressing force of the pressurizing bar beyond the normal value is not limited to the example shown in FIG. 1, but a swinging pressurizing bar 11 as shown in FIG. 2 may be used. When it is used, the control device 7 may control the swinging force of the swinging mechanism 10 to be changed in two steps, that is, a normal value and a value to be increased. However, any means that can increase the pressing force above the normal value can be applied without particular restrictions, and the required increasing force can be set appropriately according to the characteristics of the raw wood, the use of veneer, etc. Absent.

Further, in the embodiment shown in FIG. 1, the pressing force is controlled to be increased only in the pressure bar corresponding to the position where the roughness of the cutting surface exceeds the arbitrary limit value. In addition to the pressure bar corresponding to the position where the roughness of the cutting surface exceeds an arbitrary limit value, the pressing force of the adjacent pressure bar is also controlled to be appropriately increased to prevent the transfer of the rough surface. It doesn't matter if you do this.

Also, as in the embodiment of FIG. 1, each time the roughness of the cutting surface exceeds an arbitrary limit value, the applied pressure of the applicable pressure bar is controlled to temporarily increase above the normal value, and It is effective to increase the pressing force intermittently in response to passage, because it is possible to limit the increase in the pressing force to the necessary minimum. As described above, in the case of cutting a raw wood in which the rough surface does not appear over the entire area in the axial direction, after the roughness of the cutting surface once exceeds an arbitrary limit value, the subsequent detection mechanism Regardless of the detection by the control, the pressure of the pressure bar at the corresponding position is controlled to increase above the normal value until the end of cutting, and even if the increase is continuously performed, damage to the raw wood or simple There is little risk of causing problems such as uneven plate thickness, so there is practically no problem and Suppressing portions of is because it is advantageous in that it can be prevented from being inferior reactivated, whether by any control, no problem be properly selected depending on the properties of wood and the like.

[Brief description of drawings]

FIG. 1 is a side view of a device applied to the implementation of the cutting method according to the present invention, and FIG. 2 is a side view of another device. 1,11 …… Separated pressure bar, 2 …… Pressure bar stand, 3 ……
Single plate cutting blade, 4 ... log, 5 ... Single plate, 6 ... Strain gauge, 7 ... Control device, 8 ... Pressure increasing mechanism, 9 ... Sensor, 10 ... Oscillating mechanism

Claims (1)

[Claims] 1. A pressure bar of veneer lace is divided into a plurality of parts so that the pressing force can be adjusted separately, and the roughness of the cutting surface of the raw wood is detected by a detection mechanism, and the roughness is set to an arbitrary limit value. When exceeding the limit, increase the pressing force of the pressure bar corresponding to the position where the roughness of the cutting surface exceeds an arbitrary limit value at least based on the detection signal from the detection mechanism above the normal value. A method for cutting raw wood in veneer lace, which is characterized by continuously cutting while improving the cutting surface after polishing.