JPS6045561B2 - Method and device for cutting raw wood logs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to cut a raw log into a predetermined length in order to mount it on a veneer race, for example, the present invention determines in advance the axis of rotation during lathe of the log after cutting, and sets the rotation axis to this axis. The present invention relates to a method and device for cutting raw wood logs in orthogonal planes.

Generally, when producing veneer veneer by turning raw logs with a veneer lace, the logs are placed on life rollers with a V-shaped cross section and transported to the cutting position. The length is measured and cut into unit lengths such as 5 shaku, 6 shaku, or 3 shaku. However, the log log is a normal size and has a diameter of 17TL.
The front and back lengths are 8 to 20wt, and the front and back are often distorted as a whole, so if this is cut by positioning with a life roller, the cut end surface will be inclined with respect to the center of the log after cutting. This often happens.

That is, as shown in FIG.
When cutting with a chain saw perpendicular to the center line X positioned by the life roller while conveying in the direction, the cut end faces a, , a, . . . a.

are not perpendicular to the center lines Xl, X2, X3, and X4 of the logs 1a, 1b, 1c, and 1d after cutting. Therefore, such, for example, raw wood log 1
When mounting b on a veneer race, as shown in Figure 2, the gripping force of the chuck 3 on the spindle 2 becomes uneven, making it impossible to reliably transmit the rotational driving force, or causing the log to be off-center. Because gripping pressure is applied to the position in the direction of arrow B, problems such as bending of the log have occurred.

Furthermore, when turning is carried out under such conditions, both edges of the turned veneer veneer become non-parallel and need to be cut out.
There was also the drawback that the yield was low because logs were cut into long logs to account for this. The present invention was made in order to eliminate such conventional drawbacks. Prior to cutting a raw log, the rotation axis for turning the log after cutting is determined, and then this rotation axis is aligned with the cutting surface of the cutting machine. It is an object of the present invention to provide a method and device for cutting logs into pieces by moving the logs almost perpendicularly and cutting the logs at predetermined cutting points.

The invention will be described in detail below with reference to one embodiment shown in the drawings.

In FIG. 3, reference numeral 4 denotes a lie roller on which a raw wood log 5 is placed and conveyed in the longitudinal direction.

A driving device drives the rollers in the horizontal direction (indicated by arrow C) perpendicular to the conveying direction and in the vertical direction (indicated by arrow D) at a predetermined interval between the trochanters of this liep roller 4. Log support stands 6, 6, . . . are arranged. 7 is
A non-contact switch using a phototube. When the Life Roller is running, it detects the tip of the log and outputs a signal to stop the Life Roller.

Reference numeral 8 denotes a chain saw that is installed to rotate around a pivot shaft 9 in a plane perpendicular to the conveying direction of the lie roller 4.

Reference numerals 10 and 11 are a horizontal position detection device and a vertical position detection device for logs using image sensors, respectively, and their outputs are input to a control device (not shown) to determine the center of the log at the measurement position. Desired.

Although only one pair of these horizontal position detection devices and vertical position detection devices are shown in the figure, two pairs are arranged at the tip and cutting portion of the log, and the control device can detect these two pairs of detection devices. From the output, the central axis connecting the centers of the raw wood logs in both measuring sections is determined. Furthermore, the control device controls the drive mechanism of the log support stands 6, 6, .

Note that when controlling the drive device, the detection devices 10 and 11
The system continuously detects the position correction results of logs and feeds the results back to the control device. FIG. 4 shows detection devices 100 and 110, which are composed of a slit-shaped light source L and a light receiving section R in which a plurality of light receiving elements are arranged in a row in the longitudinal direction, as a horizontal position detecting device and a vertical position detecting device. This shows an example used.

In the horizontal position detecting device 100, the light source L and the light receiving part R are arranged vertically facing each other with the log 5 sandwiched between them, and the vertical position detecting device 110 is arranged horizontally facing each other.

In addition, in order to avoid as much as possible a decrease in sensitivity due to the accumulation of dust, etc., as shown in FIG. They may be arranged alternately.

Note that the configuration other than the detection device is the same as that of the embodiment shown in FIG. 3, so the same parts are given the same reference numerals and the explanation of the other parts will be omitted.

In the round cutting device shown in FIG. 3, a long raw wood log 5 is placed on a lie roller 4 and sent in the direction of arrow E.

When the tip reaches the non-contact switch 7,
When detected by the non-contact switch 7, a stop signal is output from the control device to the drive device of the lie roller 4. Here, the log cutting position coincides with the cutting position of the chain saw 8. Next, the horizontal position detecting device 10 and the vertical position detecting device 11 measure the spatial positions of the tip and cut portion of the log, and the measurement results are input to a control device (not shown), where the log is A rotation axis connecting the centers is determined, and a drive signal is outputted to start the drive devices of the log supports 6, 6, .

In response to this signal, for example, a drive device for the log holders 6, 6 raises the log holders 6, 6, and moves them appropriately in the horizontal direction to adjust a predetermined position. The correction to tilt the rotation axis backward is performed by the above-mentioned operation, but the correction to tilt the rotation axis forward is performed by raising the rear log holder 6, as shown in FIG. The above operation is similarly performed in the embodiment shown in FIG. Note that instead of the above operation, the light reception result of the detection device may be displayed on the operation control panel in front of the operator, and the operator may adjust the position of the log while looking at this display. Thereafter, the raw wood log is fixed with a suitable holding member as required, and the chain saw 8 is operated to cut the raw wood log.

As shown in FIG. 7, it is preferable to install two chainsaws at a predetermined interval along the conveyance direction, and to simultaneously perform shaping of the tip and cutting to a fixed length. In the figure, reference numeral 12 denotes a spare chain saw that is in a standby state. FIG. 8A shows the cutting positions of logs cut by the above-mentioned device, and each cutting surface a/, A2'', . It is orthogonal to X3 and X4.

Note that these rotational axes Xl, X2, X3, and X4 are not limited to the lines connecting the centers of both end faces of the raw wood after cutting, but for example, in the case of logs with many uneven surfaces, the rotational axes that give the highest yield can be used. You may also use this rotation axis. Also, if necessary, without cutting twice at A2'' and A3'', the cut surfaces a1'' and A2''
, . . . The cutting may be performed by correcting the position of the log so that A5″″ becomes an intermediate angle. According to the present invention configured as described above, both end faces of the log after cutting are perpendicular to the rotation axis when mounting the veneer lace, so the chuck of the spindle evenly presses the end faces of the log, increasing the driving force. is uniformly transmitted to the raw wood log, and the direction of the pressing force also coincides with the direction of the rotating shaft, so turning can be performed smoothly and the raw wood log will not warp.

Furthermore, the edges of both sides of the O1 veneer veneer are parallel,
Since the part removed by the draw knife is very small,
Yield is also improved. It also eliminates the conventional labor of manually measuring the log and setting the cutting position each time. In the above embodiments, a lie roller and a separate log holder were used as the log position correction device, but some of the trochanters of the lie roller may have a similar position correction function.

In addition, instead of raising the log holder to correct the position, the liep roller 4 is provided with a lifting function and is lowered from the transport position shown in FIG. 9A to support the log 5 on the log holder 6. From this state, the position may be corrected as shown in FIG. 9B. Furthermore, the detection device for detecting the spatial position of the raw wood log is not limited to a non-contact type, but can be a contact type, and the locations to be placed are not limited to two near both ends, but can be increased as necessary. You can.

[Brief explanation of drawings]

Fig. 1 is a side view showing the cut end surface of a raw wood log cut by the conventional method, Fig. 2 is a front view showing the state in which the log cut by the conventional method is gripped by a chuck made of veneer lace, and Fig. 3 is the present invention. 4 is a perspective view showing another embodiment of the present invention, FIG. 5 is a front view showing the arrangement and state of the detection device of still another embodiment, and FIG. 6 is a perspective view showing one embodiment of the present invention. 7 is a principle diagram showing the position correction method according to the present invention, FIG. 7 is a top view showing the arrangement of a chain saw in an embodiment of the present invention, and FIG. 8A
, B are side views showing the cutting position of the log according to the present invention, and FIGS. 9A and 9B are front views showing the state of correcting the position of the log according to another embodiment of the present invention. 4...Lip roller, 6...Log wood holder, 7...Non-contact switch, 8...Chain saw, 10...Horizontal position detection device, 11・・・・・・
・Vertical position detection device.

Claims (1)

[Claims] 1. When cutting a log into a predetermined length and mounting it on a veneer race for turning, the axis of rotation of the cut log during turning is determined in advance, and then this A method for cutting raw wood logs into pieces, characterized by cutting the raw wood logs at predetermined cutting points by moving the raw wood logs so that the rotating shaft is almost perpendicular to the cutting surface of a cutting machine. 2. A cutting device whose blade moves in a substantially vertical direction to cut a log placed substantially horizontally into a predetermined length; A detection device that detects a spatial position, a position correction device that moves the spatial position of one end of the log relative to the other end, and a rotation axis when turning the log after cutting based on the detection results of the detection device. and a control device for controlling the position correction device so that the axis of rotation is substantially perpendicular to the cutting surface by the blade of the cutting device. 3. The round cutting device according to claim 2, comprising a conveying device for conveying the raw wood log in the longitudinal direction, and the conveying path thereof is substantially perpendicular to the cutting surface of the cutting device. 4. The round cutting device according to claim 3, wherein the conveyance device includes a stopper that stops the cutting portion of the log at the cutting position of the cutting device. 5. The ball cutting device according to any one of claims 2 to 4, wherein the detection device is an optical detection device that detects the spatial position of the log in a non-contact manner. 6. The round cutting device according to any one of claims 2 to 5, wherein two cutting devices are arranged in parallel so that the interval between the blade portions is equal to the length of the log to be cut.