JP4374531B2 - Finger joint cutter - Google Patents

Description

  The present invention relates to a finger joint cutter, and more particularly, to a finger joint cutter that can be cut well with respect to an end material such as a laminated plate or a particle board without causing a breakage or crack of a joint finger. It is.

As a means of reclaiming offcuts produced when cutting from solid wood and thinned wood of small diameter trees, production of laminated lumber by the finger joint method is widely carried out. In this finger joint method, after cutting the end material and thinned material into, for example, a rectangular plate having a width of 50 mm and a thickness of 20 mm and having an arbitrary length, as shown in FIG. 11, the plate 10 (workpiece) A joint finger 12 having a chevron shape at the end is cut by the protruding teeth 16 of the finger joint cutter 14, and the joint fingers 12, 12 of the obtained two plate members 10, 10 are engaged with each other in the longitudinal direction. By compressing to a laminated material, the laminated material is joined to each other. Each joint finger 12 is preliminarily coated with an adhesive to increase the bonding strength of the laminated material.
JP-A-2-286202

As described above, the end wood from thin wood and the thinned wood of small-diameter wood can be easily laminated by the finger joint method, and can be effectively reused, so that they can be highly evaluated. However, with regard to the end material generated from a laminated board (plywood) in which a large number of thin plates are stacked and a particle board in which wood chips are hardened into a plate shape with glue or the like, it is possible to apply a finger joint method to the end material to form a laminated material It was difficult and its effective reuse was not generally attempted.

Therefore, the reason why it is difficult to perform finger processing on the end material such as the laminated plate or the particle board will be described. FIG. 10 is a perspective view showing a schematic structure of the finger joint cutter 14. The cutter 14 includes a plurality of unit cutters 18 having two projecting tooth portions 16 and 16 extending in the radial direction in the rotation axis direction. It consists of a combination of stacked sheets. In this case, the plurality of unit cutters 18 are not stacked so that the protruding teeth 16 overlap in the same direction (in the same phase), but the extending direction of the protruding teeth 16 is 90 as shown in FIG. The layers are alternately shifted so as to be different at intervals.

  That is, as shown in FIG. 11, when the protruding teeth 16 of each unit cutter 18 are observed from the lateral direction, the protruding teeth 16 indicated by the first and third solid lines from the top, the second and fourth from the top, and 4 The protruding tooth portion 16 indicated by the two-dot chain line on the first sheet is 90 degrees out of phase about the rotation axis (see FIG. 10). This means that while the first and third protruding teeth 16, 16 from the top are cutting the joint fingers 12 into the plate 10, the second and fourth protruding teeth from the top. The parts 16 and 16 mean that they are waiting for cutting with a phase angle of 90 degrees with respect to the former.

  In this way, the joint finger 12 of the plate member 10 is not cut at a time as the finger joint cutter 14 rotates, but one side of the chevron forming the finger 12 is formed by the protruding tooth portion 16 of the unit cutter 18. After the cutting, the other side of the chevron is cut by the protruding teeth 16 of another unit cutter 18 adjacent to each other with a phase of 90 degrees. In other words, while one side of the chevron in each finger 12 is cut away by the protruding tooth part 16, the portion that should be the other side of the chevron is still in a state of being supported by another protruding tooth part 16. Will not be.

When the above-described laminated board or particle board is selected as the workpiece 10 under the cutting condition of the finger joint cutter 14 as described above, the joint finger 12 cut into the workpiece 10 is broken or cracked ( 11), and the dimensions of the top width t ₁ and the bottom width t ₂ of the finger 12 shown in FIG. 11 are different for each finger and are not uniform. This is because, as described above, the laminates and boards are more fragile and have a non-uniform strength distribution than structurally solid wood ends. Moreover, as described with reference to FIG. 10, the protruding teeth 16 of the unit cutters 18 adjacent to each other in the rotation axis direction are laminated with a phase difference of 90 degrees, so that one side of the crest of the joint finger 12 is cut off. The fact that the protruding tooth portion 16 does not exist on the side of the other side to be the peak portion is also a cause combined with the brittleness of the workpiece 10 while being cut. If there is a defect in the joint finger 12 cut in this way, the desired joint strength as a laminated material cannot be obtained, or the appearance is inferior, and the commercial value is significantly reduced.

  Therefore, in order to avoid the inconvenience described above, at the time of finger joint processing, the protruding tooth portions 16 of the plurality of unit cutters 18 stacked in the axial direction can be simultaneously cut into the ends of the workpiece 10 so that the protruding tooth portions 16 It is conceivable to set the phase to be the same. If the plurality of projecting tooth portions 16 are in the same phase, even if the laminated plate or the particle board is fragile, the joint finger 12 being cut is adjacent to the projecting tooth portions 16, 16 ( This is because it is considered that the above-mentioned defect or the like can be suppressed because the support is supported in a form sandwiched from both sides by the same phase.

  However, in practice, even if finger processing is applied to the laminated plate or particle board using the finger joint cutter 14 in which the laminated relationship of the unit cutters 18 is set so that the protruding teeth 16 are in the same phase, there is some improvement. Although seen, it was found that the joint fingers 12 that were still trimmed were broken or cracked. The reason is that, conventionally, the protruding tooth portion 16 of the first unit cutter 18 is adjacent to the protruding tooth portion 16 of the third unit cutter 18 in the axial direction across the second unit cutter 18. It is conceivable that the corresponding protruding tooth portions 16 were adjusted to have the same phase. That is, in FIG. 11, the cutting waste during finger processing is quickly and compressed at the bottom of the sharp V-groove formed by the slope of one protruding tooth portion 16 and the slope of the other protruding tooth portion 16 immediately adjacent thereto. In this case, the tip of the joint finger 12 where the scrap accumulation portion is cut is overloaded, and the chipping or cracking occurs.

In order to solve the above-described problems and achieve the intended object, the present invention is a finger joint cutter in which a finger for a joint is cut by a protruding tooth portion at an end portion of a workpiece , The cutter is composed of a combination of a plurality of unit cutters each including the protruding tooth portion stacked in the rotation axis direction, and the protruding tooth portions of the plurality of unit cutters can be simultaneously cut into a plurality of groove portions constituting the finger. In finger joint cutters arranged in the same phase,
By providing a spacer between the adjacent unit cutters, the bottom of the valley portion formed between the protruding tooth part of one adjacent unit cutter and the protruding tooth part of the other unit cutter is provided. In order to suppress cutting clogging at the bottom, the width is 0.5 mm or more and less than the top width of the finger 12.

Similarly, in order to solve the above-mentioned problems and achieve the intended purpose, another invention of the present application is a finger joint cutter in which a finger for a joint is cut by a protruding tooth portion at an end portion of a workpiece. In the finger joint cutter in which the corresponding protruding tooth portions are arranged in the same phase so that the plurality of groove portions constituting the finger can be simultaneously cut,
The finger joint cutter is composed of a combination of a plurality of unit cutters each having the protruding tooth portion stacked in the rotation axis direction, and the protruding tooth portions of the plurality of unit cutters are simultaneously cut into the plurality of groove portions of the finger. Placed in the same phase
By providing a projecting region of a required height on at least one side of the adjacent unit cutters, the bottom of the valley formed between the projecting tooth part of one adjacent unit cutter and the projecting tooth part of the other unit cutter Is configured to have a width dimension of 0.5 mm or more and less than the top width of the finger so as to suppress clogging of cutting chips at the bottom.
In order to solve the above-mentioned problems and achieve the intended purpose, still another invention of the present application is a finger joint cutter in which a joint finger is cut at the end portion of a workpiece by a protruding tooth portion. The finger joint cutter is composed of a combination of a plurality of unit cutters having the protruding tooth portions stacked in the rotation axis direction, and adjacent protrusions so as to be able to cut into the plurality of grooves constituting the fingers with a time difference. In finger joint cutters arranged in different phases with the tooth part displaced by a central angle not exceeding 5 degrees,
By providing a spacer between the adjacent unit cutters, the bottom of the valley portion formed between the protruding tooth part of one adjacent unit cutter and the protruding tooth part of the other unit cutter is provided. Further, the width dimension is 0.5 mm or more and less than the top width of the finger so as to suppress clogging of cutting chips at the bottom.
In order to solve the above-mentioned problems and achieve the intended purpose, still another invention of the present application is a finger joint cutter in which a joint finger is cut by a protruding tooth portion at an end portion of a workpiece. In the finger joint cutter arranged in different phases in which the adjacent protruding teeth are displaced in a range not exceeding 5 degrees at the central angle so that the plurality of grooves constituting the finger can be cut with a time difference,
The finger joint cutter is composed of a combination of a plurality of unit cutters having the protruding tooth portions stacked in the direction of the rotation axis, and adjacent protruding tooth portions so as to cut into the plurality of groove portions constituting the fingers with a time difference. Are arranged in different phases with the central angle displaced within a range not exceeding 5 degrees,
By providing a projecting region of a required height on at least one side of the adjacent unit cutters, the bottom of the valley formed between the projecting tooth part of one adjacent unit cutter and the projecting tooth part of the other unit cutter In order to suppress clogging of cutting chips at the bottom, the width is 0.5 mm or more and less than the top width of the finger.

  According to the finger joint cutter according to the present invention, even in the case of an end material such as a laminated material in which a large number of plate materials are stacked or a particle board that is fragile, a good finger processing is performed without causing any defects or cracks in the joint finger. be able to. In addition, effective utilization of the offcuts that have been difficult to be reused in the laminated material is achieved, and there are various effects that can increase the commercial value, such as sufficient joining strength and good appearance of the joint.

  Next, a preferred embodiment of the finger joint cutter according to the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 10, the finger joint cutter 14 has a so-called separate type in which a plurality of unit cutters 18 are stacked in the direction of the rotation axis, and a plurality of unit cutters, as will be described later with reference to FIGS. It can be classified into a so-called solid type in which a plurality of protruding tooth portions 16 and boss portions 20 (rotating shaft insertion portions) corresponding to the above state are integrally formed. The present invention is basically applicable to any type of cutter.

(About the first invention)
The first invention of the present application relates to the finger joint cutter 14 in which the protruding teeth 16 are in the same phase, and may basically be either a separate type or a solid type. FIG. 1 is a partial front view of the finger joint cutter 14 according to the first embodiment, and FIG. 2 is a side view of the finger joint cutter 14. The cutter 14 according to the illustrated example is of a separate type, and as described above, the corresponding protruding tooth portions 16 are arranged in the same phase so as to be simultaneously cut into the end portion of the workpiece 10. That is, as shown in FIG. 4, a unit cutter 18 having four protruding teeth 16 extending in the radial direction at a central angle of 90 degrees is a separate type finger joint cutter 14 laminated in the rotational axis direction. Thus, the corresponding protruding teeth 16 are aligned in the rotational axis direction with the same phase.

As shown in FIGS. 4 and 1, a spacer 22 having a required diameter is interposed between the unit cutters 18 stacked in the same phase. The spacer 22 basically has a flat ring shape. As can be seen from FIG. 1, when the unit cutters 18 and the spacers 22 are alternately stacked in the rotation axis direction, the spacers 22 are adjacent to each other. The width of the bottom of the trough 24 defined between the inclined surfaces of the protruding teeth 16 and 16 is 0.5 mm or more so that the clogging of cutting chips at the bottom can be suppressed. It is set to be less than ₁ . Therefore, the thickness required for the spacer 22 is 0.5 mm or more and less than the top width t ₁ of the finger 12. Further, (a) as shown by a solid line in FIG. 3, the depth from the top of the projecting tooth portion 16 to the bottom of the valley portion 24 when the unit cutters 18 are stacked without sandwiching the spacer 22 is defined as h _1. (B) As indicated by broken lines in FIG. 3, the depth from the top of the projecting tooth portion 16 to the outer periphery of the spacer 22 when alternately stacked via the spacer 22 is h _2, and (c) As shown in FIG. 11, when the length of the finger 12 is m, the diameter required for the spacer 22 needs to satisfy the relationship of h ₂ > m.

In this way, by inserting the spacer 22 with the required thickness and the required diameter between the unit cutters 18, 18, the V-shaped valley 24 defined between the inclined surfaces of the two protruding teeth 16, 16. In addition, it is possible to prevent clogging of cutting chips. That is, in FIG. 3, the width of the bottom of the valley 24 defined between the adjacent protruding teeth 16 is 0.5 mm or more and less than the top width t ₁ of the finger 12, so This eliminates the sharp and deep bottom, and the waste generated with the cutting of the boards is easily discharged from the trough 24, resulting in difficulty in clogging. Therefore, the tip of the joint finger 12 is not excessively pressed by the chips accumulated in a compressed state in the valley portion 24 between the two protruding tooth portions 16, 16, and the finger 12 is prevented from being broken or cracked. be able to. Moreover, since the adjacent protruding teeth 16 and 16 are in the same phase, the joint finger 12 is supported by the two protruding teeth 16 and 16 from both sides during finger processing, which is also damaged or cracked in the fingers 12. Contributes to the suppression of

The tip of the joint finger 12 cut at the end of the workpiece 10 is not sharp (sharp point), and the depth of cut of the finger joint cutter 14 is flattened as shown in FIG. Is adjusted. Therefore, as shown in FIG. 3, even if the spacers 22 are alternately interposed between the unit cutters 18, the shape of the fingers 12 cut into the workpiece 10 does not change.

  FIG. 5 shows another embodiment of the first invention, which is a separate type and a finger joint cutter 14 in which each protruding tooth portion 16 is set to the same phase, in which the unit cutter 18 is replaced with the spacer 22 instead of the spacer 22. A projecting region 26 having a required thickness and a required diameter is provided on at least one surface. The protruding region 26 also has a thickness necessary for raising the bottom of the valley portion 24 formed between the protruding tooth portion 16 of one adjacent unit cutter 18 and the protruding tooth portion 16 of the other unit cutter 18. What is necessary is just to set to the dimension which can ensure a diameter. In addition, protruding regions 26 and 26 having a required thickness and a required diameter may be provided on both sides of each unit cutter 18.

6 and 7 show still another embodiment of the first invention, which is a solid type in which the protruding teeth 16 are formed integrally with the boss 20 and the protruding teeth 16 are aligned in the same phase. It is the finger joint cutter 14 made to do. In this case, the bottom portion of the valley portion 24 in the two adjacent protruding tooth portions 16 and 16 has a dimension capable of suppressing clogging of cutting chips at the bottom portion, that is, 0.5 mm or more and less than the top width t ₁ of the finger 12. Is set to

(About the second invention)
The second invention of the present application relates to the finger joint cutter 14 in which the protruding teeth 16 are in slightly different phases, which may be either a separate type or a solid type, but from the standpoint of ease of manufacture, a separate type. Is recommended. . FIG. 8 is a plan view of a separate type finger joint cutter 14 according to the embodiment, and the protruding teeth 16 of each unit cutter 18 have different phases so that they can be cut into a plurality of grooves constituting the joint finger 12 with a time difference. Is set. As this different phase, it is preferable to displace adjacent protruding teeth within a range not exceeding 5 degrees in central angle.

In this case, the bottom portion of the valley portion 24 in the finger joint cutter 14 also needs to have a width dimension of 0.5 mm or more and less than the top width t ₁ of the finger 12 so as to suppress cutting clogging at the bottom portion. is there. As specific means, it is proposed that the spacers 22 are interposed between the unit cutters 18 every other as described above, and the protruding regions 26 are provided on one side or both sides of the unit cutter 18.

It is a partial front view of a separate type finger joint cutter according to a preferred embodiment of the first invention. It is a side view of the separate type finger joint cutter which concerns on FIG. It is expansion explanatory drawing of the trough part in a separate type finger joint cutter. It is a schematic perspective view which shows the separate type finger joint cutter which concerns on FIG. 1 in a disassembled state. It is a schematic perspective view which shows the separate type finger joint cutter which concerns on another Example of 1st invention in a disassembled state. It is a partial front view of the solid type finger joint cutter which concerns on another Example of 1st invention. It is a side view of the solid type finger joint cutter shown in FIG. It is a side view of a spiral type finger joint cutter according to a preferred embodiment of the second invention. It is a schematic perspective view which shows the spiral type finger joint cutter shown in FIG. 8 in an exploded state. It is a perspective view which shows schematic structure of the conventional finger joint cutter. It is a partial front view which shows the state which is cutting the workpiece by the conventional finger joint cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Work material 12 Joint finger 14 Finger joint cutter 16 Projection tooth part 18 Unit cutter 22 Spacer 24 Valley part 26 Projection area

Claims (4)

A finger joint cutter (14) in which the joint finger (12) is cut by the protruding tooth portion (16) at the end of the workpiece (10), the finger joint cutter (14) The unit cutter (18) having the projecting tooth portion (16) is composed of a combination of a plurality of sheets laminated in the rotation axis direction, and the projecting tooth portion (16) of the plurality of unit cutters (18) includes the finger (12 In the finger joint cutter arranged in the same phase that can be simultaneously cut into a plurality of grooves constituting the
By providing a spacer (22) between the adjacent unit cutter (18) and the unit cutter (18), the protruding tooth part (16) of one adjacent unit cutter (18) and the other unit cutter ( The bottom part of the valley part (24) formed between the protruding tooth part (16) of 18) is not less than 0.5 mm so that the clogging of cutting waste at the bottom part can be suppressed. A finger joint cutter characterized by having a width dimension less than the top width (t1). A finger joint cutter (14) in which the joint finger (12) is cut by the protruding tooth portion (16) at the end of the workpiece (10), and a plurality of members constituting the finger (12) In the finger joint cutter in which the corresponding protruding teeth (16) are arranged in the same phase so that they can be simultaneously cut into the groove,
The finger joint cutter (14) is composed of a combination of a plurality of unit cutters (18) having the protruding tooth portions (16) stacked in the rotation axis direction, and the protruding teeth of the plurality of unit cutters (18). The portion (16) is arranged in the same phase that can be simultaneously cut into the plurality of grooves of the finger (12),
By providing a protruding region (26) of a required height on at least one side of the adjacent unit cutters (18), the protruding tooth part (16) of one adjacent unit cutter (18) and the other unit cutter (18) The top of the finger (12) is 0.5 mm or more so that the bottom of the trough (24) formed between the projecting tooth (16) and the protruding tooth (16) can be suppressed from being clogged with cutting chips at the bottom. A finger joint cutter characterized in that the width dimension is less than the width (t1). A finger joint cutter (14) in which the joint finger (12) is cut by the protruding tooth portion (16) at the end of the workpiece (10), the finger joint cutter (14) It is composed of a combination of a plurality of unit cutters (18) each having a protruding tooth portion (16) laminated in the direction of the rotation axis, and adjacent protrusions so as to cut into a plurality of groove portions constituting the fingers (12) with a time difference. In finger joint cutters arranged in different phases with the tooth part (16) displaced in the range not exceeding 5 degrees in the central angle,
By providing a spacer (22) between the adjacent unit cutter (18) and the unit cutter (18), the protruding tooth part (16) of one adjacent unit cutter (18) and the other unit cutter ( The bottom part of the valley part (24) formed between the protruding tooth part (16) of 18) is not less than 0.5 mm so that the clogging of cutting waste at the bottom part can be suppressed. A finger joint cutter characterized by having a width dimension less than the top width (t1). A finger joint cutter (14) in which the joint finger (12) is cut by the protruding tooth portion (16) at the end of the workpiece (10), and a plurality of members constituting the finger (12) In finger joint cutters arranged in different phases in which adjacent protruding teeth (16) are displaced within a range not exceeding 5 degrees in central angle so that they can be cut into the groove with a time difference,
The finger joint cutter (14) is composed of a combination of a plurality of unit cutters (18) having the protruding tooth portions (16) stacked in the direction of the rotation axis, and to a plurality of groove portions constituting the fingers (12). In order to be able to cut with a time difference, adjacent protruding teeth (16) are arranged in different phases with the central angle displaced within 5 degrees,
By providing a protruding region (26) of a required height on at least one side of the adjacent unit cutters (18), the protruding tooth part (16) of one adjacent unit cutter (18) and the other unit cutter (18) The top of the finger (12) is 0.5 mm or more so that the bottom of the trough (24) formed between the projecting tooth (16) and the protruding tooth (16) can be suppressed from being clogged with cutting chips at the bottom. A finger joint cutter characterized by having a width dimension less than the width (t1).

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