JPS6112301A - Anchor joining method in veneer joining machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is used in the field of plywood manufacturing, and is particularly applicable to the entire uninterrupted strip of veneer veneer cut by a veneer lace, veneer slicer, etc. Apply molten hot-melt resin to the top and end surfaces of the joints of the small mountain veneers cut to size in a T-shaped cross section and anchor them to obtain all the jointed veneers connected in a sash shape. The present invention relates to an anchor joining method in a veneer joining machine.

(b) Prior art A method for joining small-sized veneers of this kind, which is a prior art, is disclosed in, for example, the prior application Japanese Patent Publication No. 13424/1983, a veneer cutting and joining apparatus. While the cutting blade is intermittently conveyed in the direction orthogonal to the cutting direction, defective parts at the front and rear to be cut and separated or in between are naturally removed directly below by the feeding and feeding operations of the cutting blade for front cutting and the cutting blade for rear cutting. Only effective veneers that have been cut to size are made to abut each other's end faces at the cutting location by the feeding motion of the cutting blade for front cutting, and hot melt resin, etc. is immediately applied to the abutment area at the cutting location. There are methods such as applying or pasting adhesive or adhesive thread using a resin injector to obtain a continuous veneer-like veneer. In the case of a blind-shaped jointed veneer, a thin film of hot-melt resin is applied and hardened only to the top surface of the joint, and the hot-melt resin is applied in a T-shaped cross section to each of the top and end surfaces of the joint. Since the joint part is easily bent on the side where the hot melt resin is applied, the joint part is easy to break, so it is limited to joining relatively thin veneers, and it is not possible to join thick veneers at all due to lack of strength. It was unsuitable.

(c) In order to compensate for the lack of strength due to the problem that the invention seeks to solve, hot melt resin is cut on the upper surface and end surface of the joint part [111i] The cross section is T-shaped. Due to the anchoring effect of the hot metal/L'met resin, even relatively thick veneers do not bend easily on either side, which means that they do not easily break during handling in subsequent processes.A complete series of strong bonded veneer products. This is an attempt to produce efficiently in the process.

(2) Means to solve the problem The anchor joining method of the present invention can be summarized as follows: The anchor joining method of the present invention advances to the upper surface of the veneer joint, extrudes the resin in a spot shape, and then retreats. A veneer bonding machine equipped with a mobile resin extrusion block and a mobile resin cooling block configured to press and cool the molten hot melt resin extruded into a syspot shape from above by the mobile resin extrusion block, a) A first step in which the leading edge of the trailing veneer that has been cut is stopped at a slightly higher position than the contour line of the trailing edge of the leading veneer in the standby position.

b) A second step of extruding and applying molten hot melt resin in spots on the upper surface and end surface of the leading edge of the succeeding veneer stopped at different levels and the upper surface of the trailing edge of the preceding veneer, respectively.

C) Third step of lowering the leading edge of the succeeding veneer coated with the molten hot-melt resin onto the contour line of the trailing edge of the preceding veneer in the standby position to flatten both veneers. .

d) A fourth step of waiting for the end faces of both veneers to abut, and then pressing and cooling the molten hot melt resin applied to the end faces and upper faces from above to anchor the veneer into a T-shaped cross section.

This is an anchor welding method using a veneer welding machine that has the following components.

(E) Function To explain in detail the functions of the first to fourth steps of the present invention, in the first step, the leading edge of the succeeding veneer which has been cut at the leading edge is cut after the previous joining operation has been completed. By raising the leading veneer, which is already in the standby position, to a position slightly above the contour line of the trailing edge of the veneer, for example by a height corresponding to the thickness of the veneer, and stopping at a different level, the front of the following veneer is In addition to the top surface of the edge and the top surface of the trailing edge of the preceding veneer, the end surface of the leading edge of the trailing veneer is exposed to the surface, and in the second step, the top surface and end surface of the trailing veneer are By extruding and applying molten hot-melt resin in spots at intervals to each of the upper surfaces of the trailing edges of the preceding veneers, each applied surface acts to crosslink. In the process, the leading edge of the trailing veneer coated with molten hot-melt resin is lowered to the contour line of the trailing edge of the leading veneer in the standby position, and the two veneers are flattened against each other. The molten hot-melt resin applied to the leading edge of the succeeding veneer penetrates and is applied to the trailing edge of the preceding veneer, and then in the fourth step, both veneers are coated. By pressing and cooling the molten hot-melt resin applied to the end and top surfaces of the boards, the top surface of the joint between the two veneers is crushed thinly, and it penetrates further into the end surface, forming a deep T-shaped cross section. It is a substance that acts to form an anchored hot melt resin.

(F) Example The embodiment of the present invention will be described in detail with reference to the attached drawings, which is an improved version of the veneer cutting device disclosed in the earlier patent application No. 55-140509.First, as shown in FIG. 1b is the rear cutting operation of the preceding veneer 6, and the cutting blade 1b for rear cutting is paid out downward, intersects with the receiving blade surface 2b located above the double-sided receiving blade 2, and closes the unloading path. , a gap is formed between the cutting blade 1a for front cutting inserted downwardly on one side and the receiving blade surface 2a located below the double-sided receiving blade 2 to allow free passage of the succeeding veneer 6; become. Further, since the carry-in conveyor 4 is also configured to move up and down together with the cutting blades 1a and 1b, the subsequent veneer 6 that is newly carried in by the carry-in conveyor 4
The defective part near the front edge of is projected into the gap between the receiving blade surface 2a located below the double-sided receiving blade 2 and the cutting blade 1a for front cutting. Next, as shown in Figure 2, the defective part near the right front edge that protrudes into the gap between the receiving blade surface 2a located below the double-sided receiving blade 2 and the cutting blade 1a for front cutting is In synchronization with the timing when the cutting blade 1a comes directly above the cutting blade 1a, the cutting blade 1a for the front cutting, the cutting blade 1b for the back cutting, and the carry-in conveyor 4 simultaneously pay out upward, and carry out a leading edge cutting operation of drawing in and rising. Because it will be,
The defective portion is automatically cut by the cutting blade 1a for front cutting and becomes chips 5a which fall directly below and are separated.

Therefore, during the cutting operation of the cutting blades 1a and 1b, the cutting blade 1a for front cutting is extended upward and intersects with the receiving blade surface 2a located below the double-sided receiving blade 2, thereby closing its delivery path. At the same time, there is a trailing veneer 6 between the cutting blade 1b for post-cutting that is fed upward and the receiving blade surface 2b located above the double-sided receiving blade 2.
A gap is formed that allows the free passage of. At this time, both the carry-in conveyor 4 and the transfer member 4a attached to the tip of the carry-in conveyor 4 rise together with the cutting blades 1a and 1b to cut the leading edge of the following veneer 6, which has been cut.
The preceding veneer 6 is already in the standby position after the previous joining operation, that is, on the receiving blade surface 2b located above the double-sided receiving blade 2.
It is stopped at a different level slightly above the contour line of the trailing edge, usually about the thickness of the plate. Next, as shown in FIG. 6, a movable resin extrusion block 8 installed above the unloading conveyor 7 so as to be freely movable and retractable, and a movable resin cooling block 9 installed in parallel with the movable resin extrusion block 8 are integrally moved to the carry-in side. That is, the cutting blade 1b for rear cutting starts moving forward toward the gap between the upper surface of the front edge of the succeeding veneer 5, and the adhesive discharge hole 8a of the movable resin extrusion block 8 cuts into the trailing veneer 5. The movable resin extrusion block 8 is stopped at a position immediately above the end surface of the front edge of the following veneer 3, and only the moving resin extrusion block 8 is lowered to the vicinity of the end surface of the front edge of the succeeding veneer 3. Then, the pulp 8b of the movable resin extrusion block 8 is opened, and the molten hot melt resin supplied from the resin supply port 8C is extruded in a spot shape from the resin spout hole 8a, and its surface is exposed in a stepped manner. The molten hot melt resin 10 is extruded from the upper surface and end surface of the leading edge of the succeeding veneer 6 and the upper surface of the trailing edge of the preceding veneer 6.
Apply so as to crosslink with a. Next, as shown in FIG. 4, at the same time that the movable resin extrusion block 8 finishes applying the molten hot melt resin 10a, the movable resin extrusion block 8 and the movable resin cooling block 9 both retreat to the unloading side, and the movable resin The backward movement of the cooling block 9 is temporarily stopped at a location directly above the veneer joint. At this time, the carry-in conveyor 4 is also lowered at the same time, and the front edge of the following veneer 6 is temporarily stopped on the contour line of the rear edge of the preceding veneer 6 which is in the standby position, so that the front edge of the following veneer 6 is stopped until then in an uneven manner. Both veneers 6.
6 are now abutted flat. Therefore, a portion of the molten hot-melt resin 10a applied to the front edge end face of the succeeding veneer 6 in the exposed surface state is transferred to the leading veneer 6 along with the collision.
The molten holatome/l/) resin 1 penetrated into the end face of the trailing edge and was coated in spots.
0a has a T-shaped cross section. Next, as shown in FIG. 5, when the application of the molten hot melt resin 10a to the T-shaped cross section is completed, the movable resin cooling block 9 immediately descends to remove the molten hot melt resin applied to the veneer joint. 10a is pressed and cooled for a required time, for example, about 0.3 seconds to 1 second, to solidify it into a hot melt resin 10b having a T-shaped cross section. Next, the movable resin cooling block 9 which has finished cooling and solidifying the hot metal and the resin 10, and the movable resin extrusion block 8 installed in parallel therewith, immediately rise to the initial standby position as shown in FIG. The incoming conveyor 4 and the outgoing conveyor 7 resume the conveying operation of both veneers 6.6 joined in a blind shape, and this time, the following veneer 6 is transferred to the preceding veneer. Since the plate 6 is carried out onto the carry-out conveyor 7 through the gap between the receiving blade surface 2b located above the double-sided receiving blade 2 and the cutting blade 4b for rear cutting, the preceding sheet is transferred to the conveyor 7 as shown in FIG. The cutting blade 1a for front cutting, the cutting blade 1b for rear cutting, and the carrying-in conveyor 4 are simultaneously operated in synchronization with the time when the defective part near the trailing edge of the board arrives directly under the cutting blade 4b for rear cutting. The defective part is automatically cut off by the cutting blade 1b for rear cutting, and chips 5b are generated by paying out downward, feeding in, and lowering to perform a trailing edge cutting operation.
Tona 9, once the delivery member 4 at the tip of the carry-in conveyor 4
It remains on top a, but is pushed out by the introduction of a new succeeding veneer 6 and falls directly below and is separated.

Incidentally, the present invention may be configured such that the operations of the embodiment in FIG. 4 and the embodiment in FIG. It goes without saying that a shock absorbing member such as a spring or an air cylinder may be installed before the carry-in conveyor 4 descends to allow the two veneers 6.6 to collide.

(g) Effect of the invention 5 The present invention has a savior-like structure and function, so that the molten hot melt resin extruded in a spot shape cuts the leading edge of the following veneer each time the leading edge cutting operation is performed. It is applied to the upper and end surfaces and the upper surface of the trailing edge of the preceding veneer so as to be cross-linked, and then cooled and solidified into a resin with a T-shaped cross section. The anchoring effect of the hot-melt resin greatly increases the bonding strength, making it difficult for relatively thick veneers to bend easily on either side.In other words, it creates a strong bond that does not easily break during handling in subsequent processes. Not only was it possible to efficiently produce board products in a series of processes, but it also significantly improved the quality of plywood products and the gluing work in the subsequent process, which was an extremely significant implementation effect. This is a great invention.

[Brief explanation of drawings]

The figure shows an example of the implementation of the present invention, and shows the first to seventh
The figure shows the operation mode according to the veneer cutting and joining order. 6...Subsequent veneer, 6...Preceding veneer, 8...Moving resin patent applicant Hashimoto Electric Industry Co., Ltd. 3 Figure 4 Figure 6 Figure 1 Figure 4L k

Claims (1)

[Claims] A moving resin extrusion block that is arranged to move forward to the upper surface of the veneer joint, extrude molten hot melt resin in a spot shape, and then retreat, and the molten hot melt extruded in a spot shape by the moving resin extrusion block. In a veneer joining machine equipped with a movable resin cooling block that presses and cools the resin from above, the leading edge of the trailing veneer whose leading edge has been cut is removed from the trailing edge of the leading veneer in the standby position. The veneer is stopped at a different level slightly above the contour line, and molten hot melt resin is applied to the upper surface and end surface of the leading edge of the succeeding veneer stopped at the different level, and the upper surface of the trailing edge of the preceding veneer, respectively. By extruding and applying the molten hot melt resin in spots, and by lowering the leading edge of the trailing veneer coated with the molten hot melt resin onto the contour line of the trailing edge of the leading veneer in the standby position, both veneers are coated. After the end faces of the two veneers meet, the molten hot melt resin applied to the end faces and top faces of the veneers is pressed and cooled from above, and anchored in a T-shaped cross section. An anchor joining method in a veneer joining machine characterized by the following.