JPH043283B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a veneer that cuts a sheet-like veneer by holding and rotating the left and right butt end surfaces of a raw raw material, and using a long blade that spans the entire length of the raw material to bite into the outer circumferential surface of the raw material. This invention relates to a method for preventing log bending in lace, in which logs that become thinner as the log progresses through cutting curve upward due to the log gripping force of the spindle and cutting resistance, causing uneven thickness of the cut veneer. .

Conventionally, as a measure to prevent the bending of logs in veneer lace, Japanese Patent Publication No. 14556/1973 is known.
These bending prevention means are equipped with a roller parallel to the axis of the log on the opposite side of the cutter across the log to be cut, and press the roller from the top surface of the log toward the axis. However, there are also defects caused by pressurization.

This is because the roller only presses the log close to its axis, and when the load is low, such as cracks, rot, etc., or areas where the wood strength is locally weakened, the rollers bite into the log deeper than necessary, causing the roller to continue to press down on the log. The rollers lift up on the rotating outer circumferential surface of the normal log, and this action causes the roller to breathe due to the outer circumferential surface of the log rotating at high speed, causing uneven pressure on the log, and the roller repeatedly coming in and out. This can cause problems such as damage to the bending prevention device. In addition, the properties of the logs used for veneer lace vary widely, and it is extremely difficult to set the appropriate pressure to counteract the bending of the logs, which are becoming smaller in diameter.Although settings are often made empirically, excess or deficiency can cause problems such as breakage of the logs. The reality is that the situation is exposed.

In order to eliminate the defects of conventional devices, the present invention provides a touch roller that descends to follow the thinning workpiece log while maintaining a set position slightly away from the outer circumferential surface of the log, a feed screw that raises and lowers the roller, and a speed changer for the roller. It is equipped with an electric motor and a control device, and uses a touch roller to press the log that has curved to the set position to prevent it from further curving, while setting the set position as a pressure lowering limit to prevent the tutch roller from lowering below that point. It is characterized by its composition.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view schematically showing a veneer lace equipped with a device for preventing bending of raw wood, and FIG. 2 is a side view of the veneer lace. In both figures, reference numeral 1 denotes a log whose left and right end faces are held between spindles 2 and 2' and rotated in the direction of arrow A. The spindle is frame 5,
It is slidably supported on hollow shafts 4, 4' which pass through the hollow shafts 5', respectively, and can be moved forward and backward in the axial direction by means of fluid cylinders 3, 3' at the distal ends. Reference numeral 10 denotes a plane stand, which is equipped with a cutting tool (not shown) for cutting veneer at its upper tip. Reference numeral 20 denotes a pressure bar body, which is normally arranged above the planer stand and is configured to be able to move forward and backward relative to the log 1 in the direction of arrow B, integrally with the planer stand 10, by means of a feed screw (not shown).

13 is a log diameter detection device. During veneer cutting, the veneer lace is rotated by a feed screw, for example, by detecting the position of the moving veneer stand because the position of the cutting edge of the veneer cutting blade installed on the plane stand 10 indicates the radius of rotation of the log being cut. It consists of a potentiometer or pulse transmitter, etc., and the detection signal is sent to the control panel 4.
2.

Reference numeral 31 denotes a fluid cylinder constituting the swinging device 30, and its distal end is pivoted to a bracket 32 placed on the upper surface of the left and right frames 5, 5' of the veneer race, and can swing about the bracket as a fulcrum. is secured to a bracket 36' disposed above the machine frame 36, which will be described later. Reference numeral 36 denotes a machine frame, which frames left and right leg parts 36A made of molded steel or the like, and a connecting beam 36B parallel to the axis of the spindle 2 that connects the leg parts in a U-shape, and is arranged with the opening facing toward the race side. The tip of the leg 36A of the opening is the enamel shaft 4,
4' through bushings to metal brackets 35, 35' which are loosely fitted, respectively, and the entire machine frame 36 can be swung back and forth in the direction of arrow D by the swinging device 30 about the enamel shaft as a fulcrum. It is configured.

Reference numeral 36S is an elevating beam whose left and right ends are slidably pivoted to the leg portions 36A via square metals (not shown), and parallel to the connecting beam 36B with an arrow E.
It is possible to go up and down in both directions. 39 is a lifting screw, and the lower end is a thrust metal 39 attached to the lifting beam 36S.
The connecting beam 36B is fixed through the T, and is vertically installed on the left and right sides by passing through the connecting beam 36B, and is rotatably supported by the connecting beam 36B at the intermediate portion by a bearing 39B.

The lower ends of the elevating screws 39 may be engaged with square metals (not shown) of the elevating beam, and may be housed inside the leg portions 36A arranged on the left and right sides of the machine frame 36, respectively. 39C is a chain wheel which is threadedly engaged with the lifting screw 39, and which is connected to the bearing 3 so as not to separate from the connecting beam due to the rotation of the chain wheel.
9B, and is locked to the connecting beam so as to be rotatable in forward and reverse directions.

Reference numeral 40 is a variable speed electric motor that is locked to the connecting beam 36B, and a chain wheel 40C is fixed to the shaft end.
Chain wheel 39C screwed into the lifting screw
This is communicated by Chain 37. Therefore, the rotation of the variable speed electric motor 40 causes the left and right lifting screws 39 to rotate in synchronization in the direction of arrow G through the chain wheel, and the lifting beam 36S moves up and down in the direction of arrow E.

38R is a touch roller, and as shown in FIG. 2, two rollers are suspended from a roller bracket 38B so as to freely rotate in the front-rear direction in parallel with the axis of the spindle 2, and the bracket 38B is also supported in the front-rear direction via a fulcrum shaft 38H. Lifting beam 36S that can be swung slightly
It is fixed on the bottom surface. Further, in this embodiment, three sets of touch rollers 38R are equally distributed on the lifting beam to constitute the roller device 38. Note that there is also an example in which only one set of touch rollers 38R is arranged at the center of the lifting beam 36S.

Reference numeral 42 denotes a control panel, which receives a detection signal from the log diameter detection device 13 and maintains the set position of the outer peripheral surface of the touch roller 38R at a distance of about 0.5 to 1.5 mm from the outer peripheral surface of the log being cut, and descends to follow the thinner log. It sends a signal to the variable speed electric motor 40 to control its rotation. Further, the set position of the roller is the lower limit of pressure of the roller, and the log is not pressurized beyond this limit. The log bending prevention device 80 is configured by each of the above configurations.

To explain the embodiment of the present invention with the above configuration, first, the machine frame 36 of the log bending prevention device is tilted to the right side in FIG. Furthermore, the plane stand 10 and the pressure bar body 20 are moved back and on standby to the right side of the figure. Log 1 in this state
is lifted by a hoist, etc., and carried to the race, and the fluid cylinders 3 and 3' are activated to move the spindle 2,
After grasping the left and right butt ends of the raw wood with 2', the hoist or the like is separated from the veneer lace.

Next, the planer stand 10 is rapidly advanced toward the log 1, and the swinging device 30 is activated to tilt the machine frame 36 to the left in FIG. It is descending. Furthermore, the spindle is driven to rotate the gripped log in the direction of arrow A, and the planer head that has reached the vicinity of the log is moved forward by switching to so-called step feed, in which the planer head advances toward the log axis by the thickness of the cut veneer per rotation of the log. It is.

Eventually, the veneer begins to be peeled off by the cutting tool on the planer stand, and the diameter of the log gradually decreases as the cutting progresses.Meanwhile, the Tatsuchi Roller 38R maintains the set position slightly away from the outer circumferential surface of the log being cut. The variable speed electric motor 40 is driven in response to the diameter reduction,
The lifting screw 39 rotates via the chain wheels 40C and 39C, and the lifting beam 36S and roller device 38 continue to move down toward the axis of the log, following the diameter of the log. The strength of the log, which counteracts the load such as cutting resistance, becomes unbalanced, and the log begins to bend upwards, and the outer circumferential surface of the log eventually bends over the touch roller 38.
The roller contacts the R outer circumferential surface and continues cutting while being prevented from further curving by the roller, progressing to the vicinity of the outer circumference of the spindle and finishing cutting.

After cutting, the planer stand 10 is separated from the log 1,
In addition, the spindle is moved backward to drop the cored log, and the device for preventing bending of the log operates the rocking device 30 to tilt and retreat to the right side, and at the same time, the lifting screw 39
is driven in the reverse direction to raise the touch roller 38R together with the lifting beam 36S, and each device waits at a predetermined position before starting the work and prepares for the next log to be carried in.

The timing of tilting the machine frame 36 to the left by the swinging device 30 and the timing of lowering the lifting beam 36S by rotation of the driving screw can be determined manually by the operator's visual inspection or by setting the log diameter on the control panel 42 in advance. It is also possible to detect when the planer stand 10 reaches the position using the log diameter detection device 13 and automatically start the fluid cylinder 31 of the swing device and the lifting screw. Furthermore, each operation after cutting is completed can also be automated in the manner described above.

Next, another embodiment will be explained with reference to FIG. Third
The figure is a side view schematically illustrating a veneer lace equipped with a device to prevent bending of raw wood.The main difference from the embodiment in Figures 1 and 2 is that the machine frame 36, which swings around an enamel shaft, is replaced with , is provided with a swing frame 56 that swings around an arm bracket 50 disposed on the top surface of the pressure bar body 20 or the plywood lace frames 5, 5', and in place of the swing device 30 disposed on the top surface of the lace frame. The point is that a rocking device 30' is provided on the upper surface of the Yabar body. In FIG. 3, each component with the same reference numeral as in the above-mentioned embodiment has the same configuration and function as described above, and the description will be omitted as appropriate to avoid duplication.

A mounting bracket 32 is disposed near the rear end of the upper surface of the pressure bar body 20, and pivotally supports the distal end of the fluid cylinder 31. Reference numeral 50 denotes arm brackets, which are arranged on the left and right sides near the tip of the upper surface of the pressure bar body, and rotatably support the fulcrum shaft 51. Reference numeral 52 denotes a swing arm whose lower end is pivoted to the fulcrum shaft 51, and whose tip end is connected to the fluid cylinder 3.
The tip of one piston rod 33 is pivotally supported via a hinge pin 53, and the fulcrum shaft 51 is rotated by swinging in the direction of arrow K. The above fluid cylinder 31, arm bracket 50, fulcrum shaft 51, and swing arm 52 constitute a swing device 30'.

Reference numeral 43 denotes an angle detection device, which is comprised of a potentiometer, a pulse transmitter, etc., which is mounted on the fulcrum shaft 51 or whose rotation is transmitted from the same shaft, and detects the rotation angle of the shaft and transmits it to the control panel 44. be. The configuration of the log diameter detection device 13 is the same as that in the embodiment shown in FIG. 2, but the detection signal is transmitted to a control panel 44.

Reference numeral 56 denotes a swinging frame framed in a U-shape by shaped steel, etc., and is arranged with an opening facing the pressure bar body, and the left and right ends of the opening are connected to the fulcrum shaft 5.
1, and the entire swinging frame is configured to be swingable in the direction of arrow D by rotation of the fulcrum shaft. In addition, lifting screws 39 are inserted on the left and right sides of the leading end of the frame that connects the opposite side of the opening, and the intermediate parts are vertically held by bearings 39B so as to be freely rotatable. In addition, at the lower ends of the two left and right lifting screws, there is a lifting beam 36 that extends in the left and right direction over approximately the entire length of the log.
S is suspended parallel to the axis of the race spindle 2 via a thrust metal 39T. 39
M is a metal bracket that loosely fits and supports the lifting screw 39 that branches out from the tip of the swing frame.

Reference numeral 39C denotes a chain wheel which is threadedly engaged with the lifting screw 39 and which is attached to the bearing 39 so as not to separate from the swinging frame 56 due to the rotation of the chain wheel.
B and is rotatably held by the swing frame. A variable speed electric motor 40 is locked near the tip of the swinging frame with its axis parallel to the lifting screw 39, and is connected to the chain wheel 39C by a chain 37 with a chain wheel 40C attached thereto.

Therefore, the variable speed electric motor 40 rotates through the chain wheel 40C, the chain 37, and the chain wheel 39C, and the left and right lifting screws 39 are synchronously rotated in the direction of arrow G in FIG.
6S will move up and down in the direction of arrow E. The roller device 38 has the same configuration as the embodiment shown in FIG. 2 and is suspended from the lifting beam 36S, and the touch rollers 38R are also arranged in a plurality of equally divided sets or in one set in the center of the beam.

44 is a control panel which receives detection signals from the log diameter detection device 13 and the angle detection device 43 and outputs the signal to the control panel 42 to control the rotation of the lifting screw 39, and to follow the lowering of the roller device 38 as the log diameter gradually decreases. Do it. That is, unlike the embodiment in FIG.
0' is arranged on the upper surface of the pressure bar body 20,
The pressure bar body is integrated with the planer stand and advances toward the log axis as the log diameter decreases, so the roller device 3
8 will be separated from the outer peripheral surface of the log, and the rotation of the lifting screw 39 is controlled in consideration of this.

It is also possible to stop the lowering of the roller device 38 due to the rotation of the lifting screw and to follow the roller device only by swinging the swinging device 30' down in the D direction.
In any case, the outer peripheral surface of the touch roller 38R is maintained at a set position at a distance of about 0.5 to 1.5 mm from the outer peripheral surface of the raw wood being cut, and is lowered to follow the raw wood that is peeled and becomes thinner. Note that the control panels 42 and 44 may be incorporated into a common control panel.

As another embodiment shown in FIG. 3, there is an example in which a swinging device 30' disposed on the upper surface of the pressure bar body is provided in a frame of veneer lace. In this case, veneer cutting can be performed over a wide range of diameters of raw wood to be treated, from the largest diameter to the smallest diameter, without changing the pressing angle of the roller device 38 much.

In the configuration shown in FIG. 3 above, the embodiment will be explained in comparison with the embodiment shown in FIG. 2. In FIG. The movable frame 56 is flipped upward to make a large opening, and the roller device 38 follows the log only by controlling the rotation of the lifting screw 39 in FIG. It is possible to control the swinging and lowering of the swinging frame, and furthermore, follow-up control is also performed by both devices working together. Note that the embodiments of other parts whose explanations are omitted are the same in both cases.

Further, in the embodiment shown in FIG. 3, the entire apparatus can be made more compact than that shown in FIG. The above-mentioned setting position, which is 0.5 to 1.5 mm away from the outer circumferential surface of the raw wood, was determined after repeating the pressure test to prevent warping from diagonally above the raw wood and confirming that there was no actual damage.

According to the present invention described in detail above, a freely rotatable roller device is installed at a set position approximately 0.5 to 1.5 mm away from the outer circumferential surface of the log whose diameter is being reduced during cutting, so that the log can be cut by a slight deflection of the log. It comes in contact with the rollers to prevent further curving, and it is possible to rationally produce veneers without breaking the logs due to excessive pressure applied to the logs by conventional equipment.

[Brief explanation of drawings]

The figure shows one embodiment of the present invention, and FIG. 1 is a front view schematically showing a veneer lace equipped with a device for preventing bending of raw wood. Figure 2 is also a side view. FIG. 3 is a side view of another embodiment as well. 10... Planer stand, 13... Log diameter detection device, 3
0,30'...Rocking device, 36...Machine frame, 36S
...Elevating beam, 38...Roller device, 39...
Lifting screw, 42, 44... control panel, 43... angle detection device, 51... fulcrum shaft, 56... rocking frame.

Claims (1)

[Claims] 1. In a veneer race that cuts a veneer while holding and rotating raw wood, a roller device that descends to follow the outer circumferential surface of the raw wood whose diameter is being reduced while maintaining a set position slightly apart from the outer peripheral surface of the raw wood being cut. A method for preventing bending of raw wood in veneer lace, characterized by preventing the bending of raw wood.