JPS6227642B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is applicable to a plate cut to a certain width, for example, with a thickness of approximately 0.5 mm.
~0.8mm The relatively thin dry veneer veneers used for front and back panels are connected near both ends, or around both ends and the center using a joining material such as hot melt adhesive thread or gummed tape. The present invention relates to a bonding drive device for bonding material in a veneer bonding machine.

(b) Prior art The bonding material sticking drive device in this type of conventional equipment presses a bonding material sticking roller with a smooth surface from above onto the top surface of the veneer veneer being carried out by a carry-out conveyor. The adhering roller is pressed against the upper surface of the veneer veneer, and in this state, the adhering roller is driven to rotate as the veneer veneer is carried out by a carry-out conveyor, and the adhering roller is pressed against the upper surface of the veneer veneer. A bonding material that is continuously pulled out by the pressing action of a roller is attached to the surface of the veneer veneer.

(c) Problems to be solved by the invention However, in the case of a relatively thin veneer veneer used for the front and back panels, for example, with a thickness of about 0.5 to 0.8 mm, when it is dried, it becomes a veneer veneer. A crack (distortion phenomenon) occurs, and the areas near both ends of the veneer veneer become wavy. The required adhesive amount is insufficient by the difference between the net surface length of the undulations of the area to be pressed, the conveyance amount of the carry-out conveyor, and the withdrawal amount of the joining material, and as a result, the pressing action by the adhesive roller is insufficient. The undulating part located on the front side (unconnected side) of the receiving part was wrinkled towards the rear edge side (carrying side) of the veneer veneer, and this folded over to straddle the depressed part of the dry rash. In other words, the veneer veneer with wrinkles forms a plywood product. When this happens, there is a serious problem in that the wrinkled area gradually accumulates in a swollen state compared to other areas, causing overlap, which significantly impairs the quality of the product. be.

The present invention solves the above-mentioned problems, and provides a material that can smooth out the wrinkles caused by dry cracks in a veneer veneer using a desired torque, and also provides a bonding material that is well bonded to the undulating parts of the surface including dry cracks and the hard and soft parts of the wood grain. By knurling it to fit into the wave shape, it is applied finely and evenly over the total length of the net surface, and it is possible to prevent a decrease in side stripping yield due to insufficient joint strength and a decrease in the quality of plywood products due to the occurrence of overlap. The object of the present invention is to provide a pasting drive device for a veneer splicing machine.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses hot-melt adhesive thread to attach the areas near both ends of a large number of veneer veneers cut to a certain width, or around both ends and the center area. , in a veneer joining machine that joins veneers in a ribbed shape with a joining material such as duct tape, the direction of rotation is perpendicular to the circumferential surface of the adhesion roller that presses and adheres the joining material to the surface of the veneer veneer. It is constructed by cutting a narrow groove-like knurling and by forcing the driving of the sticking roller by a controllable torque motor.

(E) Function When joining the veneer veneers 1, in the state shown in the first figure, a thread 8 such as polyester fiber is introduced into the impregnator 10 through the thread hole 9, and then moved to another location (not shown). The molten hot melt resin is heated and melted in the installed melting tank and pumped into the heat hose 11 by a pump, and is sequentially injected into the impregnator 10 in an appropriate amount commensurate with the consumption amount through the on-off valve 12. Possibly hot melt adhesive thread 2
a is continuously impregnated and produced, and in this state, when the adhesion roller 3, which has narrow groove-shaped knurling 3a cut on the circumferential surface perpendicular to the rotation direction, is pressed downward by a pressure device 14 such as an air cylinder, The hot melt adhesive threads 2a are continuously attached to the surfaces of the veneer veneers 1 which are placed one after another on the carry-out conveyor 7 with their end faces abutting each other, and at the same time the molten state impregnated with the hot melt adhesive threads 2a is applied. The hot melt resin is cooled and solidified to join the veneer veneers 1 together. In this case, the hot melt adhesive thread 2a is adhered to the surface of the veneer veneer 1 so as to form a fine waveform into the surface of the veneer veneer 1 by means of a knurling 3a cut on the circumferential surface of the adhesive roller 3. Amount of conveyance and the veneer veneer 1
The amount of the hot melt adhesive thread 2a drawn out during the conveyance of the hot melt adhesive thread 2a does not match the actual amount of the hot melt adhesive thread 2a that is applied, which corresponds to the total length of the net surface of the veneer veneer 1 to which the hot melt adhesive thread 2a is actually attached. Before the wrinkles are gradually accumulated just before the application roller 3, the desired rotational torque set in advance in the torque motor 4, that is, enough to stretch out the wrinkles that are gradually accumulated just before the application roller 3, is applied to the veneer. A desired rotational torque limited to a tensile strength of the board 1 or less is applied to prevent wrinkles from gradually accumulating on the surface of the veneer veneer 1, thereby preventing the bond between the veneer veneer 1 and the hot melt adhesive thread 2a. It is possible to perform a joining operation in which the hot melt adhesive thread 2a is applied to the veneer veneer 1 evenly over the entire surface without forming a non-adhesive part that is pasted so as to straddle the depressed area of the wrinkle. .

(F) Embodiment Figures 1 to 3 show an embodiment of the present invention, and 1 is a relatively thin plate cut to a certain width, for example, used for front and back plates with a thickness of about 0.5 to 0.8 mm. This is a large number of veneer veneers after drying. 2 is hot melt adhesive thread,
It is a joining material such as duct tape, and is used to connect the vicinity of both ends of the plurality of veneer veneers, or the vicinity of both ends and the vicinity of the center part, in the form of a rib.
Reference numeral 3 denotes an adhesion roller for pressing and adhering the bonding material 2 onto the surfaces of a large number of veneer veneers 1. Reference numeral 3a designates a narrow groove-shaped knurling cut on the circumferential surface of the adhesive roller 3 perpendicular to the rotational direction. Reference numeral 4 denotes a torque motor that can control the drive of the adhesion roller 3, which is driven by a forced drive that limits the rotational torque to a desired range in accordance with surface undulations including dry cracks and cracks of the veneer veneer 1. An independent direct current type independent of the drive of the unloading conveyor 7 is used so that the actual conveyance is stopped when the conveyance continues and the wrinkles caused by the ups and downs are eliminated and the drive torque required for conveyance exceeds the desired range. , an alternating current type or other torque motor 4, and the rotating torque can be adjusted electrically, for example, by inserting a variable resistor or the like into the power supply circuit to transport the veneer veneer 1 when the wrinkles on its surface are eliminated. The adhesive roller 3 is forcibly driven while applying a controlled rotational torque, which is roughly determined by the plate thickness in most cases, to the extent that the application roller 3 stops rotating, that is, when excessive rotational torque is applied, the rotation immediately stops. is configured to perform the following. Note that the torque motor 4
It is necessary to adjust the rotational torque particularly precisely for thin veneer veneer 1, but it is assumed that an appropriate rotational torque may be sufficient for thick veneer veneer 1. In the case of exclusive use, a non-fixed type torque control circuit can be used. 5 is a loading conveyor,
This is for carrying in the veneer veneer 1 one after another in a direction perpendicular to the fiber direction. 6a and 6b are movable blades,
Reference numeral 6c denotes a fixed blade, which is not shown, but uses a veneer detector such as a limit switch to detect defects on the material surface of the veneer veneer, cut it into a certain width of appropriate dimensions, and separate the chips; The veneer veneer 1 of a certain width after this cutting has been separated is carried out on the conveyor 7, and while the end faces of the veneer 1 are brought into contact with each other one after another, as mentioned above, hot melt adhesive thread is applied to the vicinity of both ends, or the vicinity of both ends and the central part. To be applied to a veneer joining machine using a string method or a combination method of string and end surface adhesion to obtain a cross-seamed product in which joining material 2 such as cam tape is continuously pasted and joined in the form of a blind. It is configured. In addition, 2a is a hot melt adhesive thread, 8 is a thread such as polyester fiber, 9 is a thread hole, 1
0 is an impregnator, 11 is a heat hose, 12 is an on-off valve, 13 is an operating device such as an air cylinder, 1
4 is the same pressurizing device. Furthermore, the adhering roller 3 in the present invention has circulation pipes 16a and 16b connected to the rotating joint 15 with a cooling liquid such as water inside.
The hot melt adhesive thread 2a in a molten state is rapidly cooled and solidified so that a large number of veneer veneers 1 can be continuously connected in a blind shape. Furthermore, a release/cooling liquid such as water can be sprayed onto the circumferential surface of the adhesion roller 3 by, for example, an on-off valve 17 actuated by compressed air as shown in the third figure. The stripping/cooling liquid mist is interposed in the circuit of the pipe 18, and the compressed air is jetted like a siphon from the tip of the compressed air supply pipe 19 to the tip of the stripping/cooling liquid supply pipe 18. Paste the roller 3, especially the knurling 3
Hang the hot melt adhesive thread 2 well over the narrow groove part of a.
The hot melt adhesive thread 2a may be configured to facilitate peeling from the hot melt adhesive thread 2a, and further rapidly cool the hot melt adhesive thread 2a using the latent heat of evaporation caused by the peeling/cooling fluid.

In the figure, 20 is a belt connecting the pasting roller 3 and the torque motor 4, and 21 is a swinging frame on which the pasting roller 3 and all other parts related to the pasting drive device are mounted.

(g) Effects As explained above, according to the present invention, the vicinity of both ends of a large number of veneer veneers cut to a certain width, or the vicinity of both ends and the vicinity of the center are bonded with a joining material such as hot melt adhesive thread or gummed tape. In a veneer joining machine that joins veneer veneers in a beveled manner, a narrow groove-shaped knurling is cut perpendicular to the rotational direction on the circumferential surface of an adhesive roller that presses and adheres the joining material to the surface of the veneer veneer. and because the pasting roller is forcibly driven by a controllable torque motor,
When joining veneer veneers, the joining material should be well blended into the narrow groove-like knurling surface cut perpendicular to the rotational direction on the circumferential surface of the adhesion roller. Since the adhesive is applied by biting into the surface of the veneer, the bonding material can be attached to the veneer with more margin than when it is applied in a straight line and in tension using a conventional adhesive roller with a smooth surface. As a result, there is no fear that the bonding material will easily peel off from the veneer veneer due to warping of the veneer veneer, etc. Unlike a simple driven rotation system, we use a forced drive system that limits the rotational torque to the desired torque using a torque motor, which helps to smooth out wrinkles caused by drying in the veneer veneer, as well as smooth out surface undulations including dry cracks. The bonding material can be applied to the hard and soft parts of the wood grain in fine waveforms, making it possible to apply the bonding material finely and evenly over the total length of the net surface. The quality of plywood products deteriorates due to overlapping, which is caused by the bonding material being pasted over the sunken areas of dry cracks, and side splitting due to insufficient bonding strength. This has an excellent effect that can eliminate all problems such as a decrease in yield.

[Brief explanation of the drawing]

The figure shows an example of implementation of the present invention,
FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a front view of another embodiment. 1...Plywood veneer, 2...Joining material, 3...Adhering roller, 3a...Knurling, 4...Torque motor.

Claims (1)

[Claims] 1. In a veneer joining machine that joins a large number of veneer veneers cut to a specified width near both ends, or around both ends and the central part, in a ripple shape using a joining material such as hot melt adhesive thread or duct tape, A narrow groove-shaped knurling perpendicular to the rotational direction is cut on the circumferential surface of the adhesive roller that presses and adheres the bonding material to the surface of the veneer veneer, and the drive of the adhesive roller can be controlled. A pasting drive device for a veneer splicing machine characterized by being driven by a forced drive of a torque motor.