JPH0441201A - Inversion preventive device for sawing board in lumbering - Google Patents

Abstract

PURPOSE:To face the cut surface of a sawing board to the carrying supporting surface of a conveyor, and to direct a bark surface upward by adjusting a mounting arm and an adjusting bar and positioning a hold-down board at a specified position to the sawing board cut from wood to be cut by a saw. CONSTITUTION:Wood to be cut 12 is placed on a wood base 18 at a specified position to a band saw 16. A mounting arm 30 is moved vertically in conformity with the diameter of wood to be cut 12, a handle 40 is turned and an adjusting bar 28 is moved forward or retreated toward wood to be cut 12, and a hold-down board 24 is located at a fixed position to a sawing board 20 accurately in the hold-down board 24. A band saw 16 is started, the wood base 18 on which wood to be cut 12 is placed is advanced, and wood to be cut 12 is cut. When a projecting branch knot, etc., collide with the hold-down board 24 during cutting, the hold-down board 24 is pushed against and moved toward the sawing machine side against the tensile force of a tension spring 32. When wood 12 is cut, the sawing board 20 is pushed by the hold-down board 24, and the upper edge of the sawing board 20 is slid on a cut surface and the cut surface of the sawing board 20 is rolled so as to be downward directed, and placed on the carrying supporting surface 22 of a conveyor through a tilt plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art) When sawing logs of raw wood with a saw to produce the required square timbers or boards, sawn boards (sawn boards, which are the remaining material after sawing the required part of the raw wood) The surplus portion) is transported to a predetermined location by a transport device such as a roller conveyor in order to proceed to the next processing step.

In the sawing process using conventional sawmilling equipment, once the sawn board is cut from the log with a saw, it must be turned over and placed on a roller conveyor with the cut surface facing up and the rough bark side of the log facing down, as shown in Figure 4. It rests on the transport support surface of a transport device such as. Because the uneven outside surface is in an unstable state in contact with the roller surface of the roller conveyor or the belt surface of the belt conveyor, the sawing board collides with the sawmill or surrounding structures during transportation and falls off the conveyor. Otherwise, the irregularities could catch on the feed rollers and cause the conveyor to stop, often necessitating the interruption of the operation of the conveyor and therefore of the sawmill.

(Problems to be Solved by the Invention) An object of the present invention is to prevent the sawing board from being interrupted due to the reversal of the sawing board as described above. facing the supporting surface,
To provide an inversion prevention device for a sawing board that overturns the sawing board so that the uneven bark surface of the raw wood always faces upward.

(Means for Solving the Problems) In order to achieve the above object of the present invention, a device according to the present invention has a configuration with the following characteristics. In other words, there is a holding plate placed parallel to the surface of the saw at a position behind the saw of the sawmill, and a presser plate that is supported by the sawmill so as to be able to move up and down and extends horizontally from the sawmill towards the holding plate and higher than the holding plate. a mounting arm extending to a position; an adjusting rod supported by the mounting arm so as to be movable along the mounting arm; one end connected to the holding plate, and the other end rotating at the sawmill side end of the adjusting rod. An arm that is freely pivoted, an arm rotation means that rotates the pivoted arm in the direction of the adjustment rod, and an arm that is rotated by the arm rotation means that rotates within a predetermined angle from the adjustment rod. and preventive measures to prevent
The feature is that the holding plate is positioned at a predetermined position relative to the sawn board cut from the wood to be cut by the saw by adjusting the mounting arm and the adjustment rod.

(Function) When the sawing board is cut from the wood to be cut, by pressing the upper part of the outer surface of the sawing board with the presser plate, the upper edge of the sawing board is pressed against the cut surface of the product lumber cut from the wood to be cut. Place the two sides of the sawing board in contact with each other, and turn it over while sliding so that the cut surface of the sawing board faces down. The holding plate is adjusted by a vertically movable mounting arm and a horizontally movable adjustment rod to a position with respect to the sawing board at a predetermined distance, that is, at a distance equal to or slightly larger than the maximum thickness of the sawing board. This ensures that the sawing board is turned over in a predetermined direction without interfering with the sawing operation.

(Example) Hereinafter, the present invention will be described in more detail based on Examples and with reference to the accompanying drawings.

FIG. 1 schematically shows a sawing board inversion prevention device 10 for sawing lumber according to the present invention. FIG. 2' shows the arrangement of the device 10, the wood to be cut 12 and the sawmill 14 according to the invention. In a sawmill 14 that uses a saw, for example, a band saw 16, to saw lumber, especially raw wood, the wood 12 to be cut is cut by the band saw 16.
It is placed on a lumber stand 18 located in front of. In FIG. 1, the wood 12 to be cut is located at the lower left side, but there is no particular relationship between left and right. The lumber table 18 is located parallel to the band surface of the band saw 16, and is driven by a drive device (not shown) as shown in FIG. 2 to move straight ahead and behind the band saw 16 of the sawmill by a required length. In the sawing operation, the timber stand 18 is placed with the thicker end of the trunk of the timber 12 to be cut facing you.
(at the position indicated by the broken line in FIG. 2), and drives the driving device (not shown) for the lumber table 18 to move the lumber table 18 toward the band saw 16 (in the direction of the arrow in FIG. 2). It is moved forward and cut with the teeth of the band saw 16. The sawn board 20 that is produced by cutting the wood 12 to be cut is placed between the wood 12 to be cut and the band saw 16.
, and is located closer to the sawmill 14 than the wood 12 to be cut. Next, the sawing board 20 slides on the inclined plate 21 and is placed on the transport support surface 22 of the sawing board transport device, and is transported by the sawing board transport device to a place where the next processing is performed. Inclined plate 2
Reference numeral 1 is a rectangular plate body, which is inclined downward toward the conveyance support surface 22 from where the band saw 16 is placed. The transport support surface 22 of the sawn board transport device extends parallel to the lumber stand 18 at a somewhat lower position adjacent to the sawmill side of the lumber stand 18 that has been moved to the rear of the band saw 16. For example, a roller conveyor is a common conveying device for sawing boards. This conveyance support surface 22 is constituted by a roller surface in a roller conveyor, for example.

Slightly behind the band saw 16, preferably 10 to 2 from the band saw 16
A pressing plate 24 is placed 0 cm away.

The function of the holding plate 24 is that when the sawing board 20 is separated from the wood 12 to be cut, that is, when the thicker end of the wood 12 to be cut is cut by the bandsaw 16, the upper edge of the sawing board 20 is The cut surface of the wood 12 to be cut is slid and transferred with the cut surface of the sawing board 20 facing down, and the cut surface is placed on the transport support surface 2 of the transport device.
2 so that it rests on the conveyance support surface 22 facing the
4 is to press the upper outer surface of the thicker end of the sawing board 20. That is, the holding plate 24 is provided to prevent the sawing plate 20 from resting on the conveyance support surface 22 of the conveyance device with the cut surface facing upward. The holding plate 24 is preferably a curved plate having a shape obtained by cutting a part of a spherical surface with a large radius into a rectangular shape, or a plate having a shape in which the peripheral edge of the rectangle is curved toward the sawmilling machine side, that is, a curved plate is provided. Make it into your body. In the case of a spherical surface, the center of the spherical surface is on the sawmill side,
The tangent at the center of the holding plate 24 is parallel to the band saw surface 16, that is, the cutting surface, and the distance between the tangent and the band saw 16 is exactly equal to or slightly larger than the thickness of the thick end of the sawing plate 26. It is located. By forming the holding plate 24 into a spherical shape or by providing a radius on the peripheral edge, the influence of unevenness such as twigs on the outer surface of the sawing plate 26 colliding with the holding plate 24 and moving the holding plate 24 is minimized. ing. The presser plate 24 is supported by a presser plate support mechanism to be described later.
and the band saw 16, and this positional relationship is maintained. By maintaining this positional relationship, the holding plate 24 can achieve its function without interfering with the movement of the wood 12 to be cut, which moves in the direction of the arrow in FIG. 2 as cutting progresses. can.

The holding plate support mechanism includes an arm 26 extending from the holding plate 24 toward the center of curvature thereof, and the arm 26 rotatably supported at the other end of the arm 26.
an adjustment rod 28 that extends horizontally within a vertical plane including the 3D and is movable in the horizontal direction; a mounting arm 30 that connects the adjustment rod 28 to a sawmill vertically via a base 36; It is comprised of an arm rotation means 32 that is driven and rotated toward the adjustment rod 28, and a stopper 34 that limits rotation of the arm 26. Even in the case of a rectangular plate with a rounded peripheral edge, the holding plate support mechanism is the same.

The mounting arm 30 for vertically connecting the adjusting rod 28 to the sawmill via the base 36 and thus for connecting the device 10 according to the invention, including the holding plate 24, to the sawmill 14 can be moved up and down by the sawmill 14. It extends horizontally towards the holding plate 24 and at a higher position. The mounting arm 30 holds the base 36 by threaded connection with bolts 38. The base 36 has support portions 33 and 35 hanging downward at both ends thereof.
have. Support part 35 at the end of the base 36 on the sawmill side
is provided with a through hole parallel to the longitudinal axis of the mounting arm 30, and a threaded groove is carved on the peripheral surface of the end facing the support part 35. Parallel through holes are provided.

The adjustment rod 28 is a rod body having one end provided with a screw thread that engages with a threaded groove in the through hole of the support section 33 and a rod body that slidably fits into the through hole of the support section 35 at the other end. It is inserted through the support parts 33 and 35 of.

A small handle 40 is provided at the tip of the threaded part of the adjustment rod 28. When the handle 40 is turned clockwise, the adjustment rod 28 moves forward toward the sawmill, and when turned counterclockwise, the adjustment rod 28 moves forward. Back up away from the sawmill.

The arm 26 that holds the presser plate 24 has one end fixed to the surface of the presser plate 24 facing the sawmill machine, and the other end supported by a shaft support 42 at the end of the adjustment rod 28 facing the sawmill machine. It is formed of a rod. The arm 26 can be rotated about the pivot support 42 on a vertical plane that includes the longitudinal axis of the adjustment rod 28 by means of arm rotation means 32 . By rotating the arm 26, the holding plate 24 can approach the sawing plate 20. The pivot support 42 consists of a pin 44 that passes through a hole provided at the pivot end of the arm 26 and two legs 46 that hang down from the adjustment rod 28 to support the pin at both ends. It is configured.

In the embodiment, the arm pivoting means 32 comprises a tension spring 32 in the form of a coil spring. One end of a tension spring 32 is attached to approximately the center of the arm 26, and the other end of the tension spring 32 is fixed to a hook 48 provided on the adjustment rod 28. The arm 26 is pulled by the spring force of the tension spring 32 and rotates about the pin 44 in the direction of the adjustment rod 28 .

A stopper 34 is provided at a portion of the adjustment rod 28 between the hook 48 and the leg portion 46 to stop the rotation of the arm 26 at a predetermined position. The stopper 34 is composed of two rods combined in an isosceles triangular shape. A protrusion provided at the joint of the two rods functions as a stop 50 of the arm 26, and the other end of each of the two rods is fixed to the adjustment rod 28. The arm 26 is rotated toward the adjustment rod 28 by a tension spring 32, and in conjunction therewith, the pressing plate 24 approaches the sawing plate 20. When the stop portion 50 of the stopper 34 comes into contact with the arm 26, rotation of the arm 26 is prevented, and the presser plate 24 remains stationary at the above-mentioned position.

Although a tension spring is used in this embodiment as a means for rotating the arm 26 toward the adjustment rod 28, this may be a compression spring or a fluid pressure device such as pneumatic or hydraulic pressure.

Next, the operation of the sawing board reversal prevention device according to the present invention will be explained. First, the wood 12 to be cut is placed on the lumber stand 18 at a predetermined position relative to the band saw 16. Next, the wood to be cut 1
2, and then rotate the handle 40 clockwise or counterclockwise to move the adjustment rod 28 forward or backward toward the wood 12 to be cut.
The presser plate 24 is positioned exactly at the predetermined position described above with respect to the sawing plate 20.

That is, the pressing plate 24 is placed in a position where the sawing plate 2
They are located at the rear of the band saw 16 at an interval that is the same as or slightly larger than the thickness of the thick end of the band saw. In this state, the bandsaw 16 is started, the lumber table 18 carrying the wood 12 to be cut is moved forward in the direction of the arrow in FIG. 2, and the wood J2 to be cut is cut. During cutting, if a convex part such as a twig protruding from the presser plate 24 toward the sawmill machine collides with the presser plate 24, the presser plate 24 is pressed toward the sawmill machine against the tensile force of the tension spring 32. and move the convex portion past the presser plate 24. When the convex part passes, the holding plate 24 is again pressed against the tension spring 3.
2 and is positioned at a predetermined position by a stopper 50. When cut, the sawing board 20 is the presser board 2
4, the upper edge of the sawing board 20 slides on the cutting surface, and the cutting surface of the sawing board 20 is turned downward so that the inclined board 21
and then rests on the conveyance support surface 22 of the conveyance device.

Preferably, as shown in FIG. 3, the presser plate 24 is configured with two upper and lower plates, an upper and lower presser plate 52 and a lower presser plate 54, respectively. The upper presser plate 52 and the lower presser plate 54 are plates having approximately the same dimensions, and the lower edge of the upper presser plate 52 and the upper edge of the lower presser plate 54 are rotatably hinged. Furthermore, the lower presser plate 54 always faces the grinding plate 20 of the upper presser plate 52 due to a torsion spring whose one end is attached to the surface of the upper presser plate 52 fixed to the arm 26 and the other end is attached to the lower presser plate 54. Rotate toward the surface. Therefore, if the width of the sawing board 20 is narrow, that is, the sawing board 2
Even if the height is low from the sawing board 18, when the upper holding plate 52 approaches the sawing board 20, the lower holding plate 54 presses the sawing board 20 as shown by the broken line in FIG. 20 is prevented from reversing. When the width of the sawing plate 20 is large, the upper holding plate 52 is
Since it functions to press down the sawing board 20, the effect of the holding board is exhibited regardless of the width of the sawing board 20, and the reversal is prevented without raising or lowering the mounting arm 30.

(Effects) The device according to the present invention can achieve the object of the present invention, that is, prevent the sawing board from reversing during sawing, with a simple structure, and is less likely to malfunction because there are no movable parts. With this device, it is possible to carry out the sawing board without any problems, so
It has the effect of improving the efficiency of lumber work.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a sawing board inversion prevention device for sawing lumber according to the present invention; FIG. 2 is a schematic plan layout view of the sawing board inversion prevention device for sawing lumber according to the present invention; Fig. 4 shows another embodiment of the holding plate of the sawing board reversal prevention device for sawing lumber according to the present invention; This shows the inverted state. 10... Reversal prevention device for sawn board 12... Wood to be cut 14... Sawmill 16... Band saw 18... Lumber stand 20... Sawing board 21... Inclined board 22... Conveyance support surface 24...Press plate 26...Arm 28...Adjustment rod 30...Attachment arm 32...Tension spring 33.35...Support part 34...Stopper 36...Base 38...Bolt 40...Handle 42...Axle support 44...Bin 46...Legs 48...Hook 50...Stopping part 52...Upper holding plate 54...Lower Holding plate Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] 1. A holding plate disposed behind the saw of a sawmill in parallel to the surface of the saw, and a holding plate supported by the sawmill so as to be movable up and down, and moving from the sawmill to the holding plate. a mounting arm extending horizontally and higher than the holding plate;
An adjustment rod supported by the attachment arm so as to be movable along the attachment arm, one end of which is coupled to the presser plate, and the other end rotatably supported by the sawmill side end of the adjustment rod. an arm, an arm rotation means for rotating the pivoted arm in the direction of the adjustment rod, and an arm rotation means for rotating the arm rotated by the arm rotation means within a predetermined angle from the adjustment rod. and stopper means for preventing the
Preventing the turning of a sawn board in sawing lumber, characterized in that the holding plate is positioned at a predetermined position with respect to the sawn board cut from the wood to be cut by the saw by adjusting the positions of the mounting arm and the adjustment rod. Device. 2. The device for preventing inversion of a sawn board in sawing lumber according to claim 1, wherein the arm rotating means rotates the arm by driving the arm by a spring means or a fluid pressure means. 3. The presser plates are hinged to each other at their edges.
3. The device for preventing inversion of a sawing board in lumber according to claim 1, comprising an upper pressing plate and a lower pressing plate, and is connected to the arm by the upper pressing plate.