JP2010059342A - Method for forming groove for sewing in surface of ray leather - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an attractive leather product by using a ray leather (2) by forming grooves (32) for sewing as required in the surface of the ray leather (2). <P>SOLUTION: A support sheet (6) is adhered to the rear surface of the ray leather (2) so as to reinforce the rigidity, and an end mill (28) driven to rotate is allowed to act on the surface of the ray leather (2). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is for sewing on the surface of ray leather sewn together with other materials such as cloth or cow leather to produce various leather products such as document bags, handbags and wallets, interior products, vehicle interior products and various shoes. The present invention relates to a method of forming a groove.

  Recently, ray leather has attracted attention as a high-grade material for various products as described above. Small particles with a diameter of about 1 to 2 mm are randomly dispersed on the surface of the ray leather, and these small particles make the surface of the ray leather extremely attractive. On the other hand, the small particles are hard and brittle substances mainly composed of calcium phosphate. Therefore, it is extremely difficult if not impossible to pass the sewing needle through the surface of the ray leather.

As disclosed in the following Patent Documents 1 to 3, when sewing various leathers such as cowhide, the surface of the leather is pressed along the required sewing line to form a concave groove, or the leather surface is required for the sewing line. It is well known that a groove is formed by cutting with a cutting tool such as an engraving knife, and sewing is performed along the groove.
Japanese Examined Patent Publication No. 56-5312 Utility Model Registration No. 37579 Japanese Patent No. 120433

  In the case of ray leather, if a groove for sewing is formed on the surface along the required sewing line and sewing is performed along the groove for sewing, the ray leather is sewn with other materials such as cloth or cow leather. This makes it possible to produce the required leather products. However, according to the experience of the present inventors, in the case of ray leather, since small particles, which are hard and brittle substances, are dispersed on the surface thereof, it is pressed to form a push groove or like a sword. It is practically impossible to cut with a cutting tool. In addition, although the surface of the leather has small particles, which are hard and brittle, dispersed therein, the overall stiffness (so-called waist strength) is remarkably small. It is difficult to form the groove.

  The present invention has been made in view of the above facts, and its main technical problem is to form a sewing groove as required on the surface of the ray leather having the characteristics as described above, thus using the ray leather. It is to provide a new and improved method of forming sewing grooves on the surface of ray leather which makes it possible to produce attractive leather products.

  As a result of intensive studies and experiments, the inventor has attached a support sheet to the back of the ray leather to reinforce the rigidity, and causes the end mill to be driven to rotate to act on the surface of the ray leather. I have found that I can achieve the task.

That is, according to the present invention, as a method of forming a groove on the surface of the ray leather that achieves the main technical problem, an attaching step of detachably attaching a support sheet to the back side of the ray leather,
After the attaching step, the ray leather and the end mill are connected to the surface of the ray leather so that the end mill extends substantially perpendicularly and the end mill tip extends beyond the surface of the ray leather to obtain the required cutting depth. And the end mill is rotated and the ray leather is moved relative to the end mill in a direction parallel to the surface of the ray leather, thus forming a groove on the surface of the ray leather. A groove engraving process,
After the groove engraving step, a peeling step of peeling the support sheet from the back surface of the ray leather,
A method for forming a sewing groove on a surface of a ray leather is provided.

  The support sheet is conveniently made of cardboard. Preferably, the end mill is rotated at a speed of 15000 to 25000 rpm. The outer diameter of the end mill is preferably 0.8 to 1.5 mm, and the width of the groove to be engraved is preferably 0.8 to 1.5 mm. The groove cutting depth at one time is 0.1 to 0.2 mm, and it is preferable to repeat the groove cutting a plurality of times to form a groove having a depth of 0.3 to 0.7 mm. It is convenient to attach the support sheet to the back of the ray leather via a double-sided adhesive tape.

  In the method of the present invention, by sticking a support sheet to the back surface of the ray leather, the rigidity of the ray leather is reinforced and handling of the ray leather is facilitated. Then, by applying a rotationally driven end mill to the surface of the ray leather, the sewing grooves as required are formed on the surface of the ray leather even though small particles, which are hard and brittle substances, are dispersed on the surface. Can be formed.

  Hereinafter, a preferred embodiment of a method for forming a sewing groove on the surface of a ray leather constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

  FIG. 1 shows a ray leather 2 on which a groove for sewing is to be formed. The ray leather 2 which has been subjected to the necessary tanning process and cut into a rectangle has a thickness of usually about 1.2 to 1.5 mm, and the surface has a diameter of about 1 to 2 mm and a depth of 0.4 mm. Small particles 4 of about 0.7 mm are relatively densely and randomly dispersed. The small particles 4 are mainly composed of calcium phosphate and make the surface of the ray leather 2 attractive.

  The stiffness (so-called waist strength) of the ray leather 2 is too small, and it is extremely difficult, if not impossible, to perform the groove-cutting process described later on the ray leather 2 as it is. Therefore, in the method of the present invention, the sticking step is first performed. In this attaching step, the support sheet 6 is detachably attached to the back surface of the ray leather 2 to increase the rigidity of the ray leather 2. The support sheet 6 is preferably substantially the same rectangle as the ray leather 2. The support sheet 6 may be cardboard having a thickness of about 0.7 to 1.2 mm. If desired, a support sheet formed from another appropriate material such as an appropriate synthetic resin film or sheet or a metal thin plate can be used. The ray leather 2 and the support sheet 6 can be detachably bonded via a commercially available double-sided adhesive tape (not shown). Instead of the double-sided adhesive tape, the support sheet 6 can also be attached to the back surface of the ray leather 2 through an appropriate adhesive such as a commercially available rubber paste.

  A groove engraving step is performed after the above-described sticking step. FIG. 2 shows a cutting machine that can be advantageously applied to the groove engraving process. Referring to FIG. 2, the illustrated cutting machine has a base 8 disposed substantially horizontally. A column 10 extending substantially vertically is fixed on the base 8. A substrate 12 extending substantially horizontally is fixed to an intermediate portion of the column 10 which may be cylindrical. A screw shaft 14 extending substantially vertically is rotatably mounted on the substrate 12, and an auxiliary column 16 extending substantially vertically is fixed. Auxiliary support column 16 may also be cylindrical. A lifting platform 18 is mounted on the column 10 and the auxiliary column 16 so as to be movable up and down. More specifically, the lift 18 has a circular opening (not shown) having an inner diameter corresponding to the outer diameter of the support column 10 and a circular opening (not shown) having an inner diameter corresponding to the outer diameter of the auxiliary support column 16. As the circular opening is fitted to the support column 10 and the auxiliary support column 16, the lifting platform 18 is mounted so as to be movable up and down along the support column 10 and the auxiliary support column 18. The lift 18 is further formed with a female screw hole (not shown), and the female screw hole is screwed onto the screw shaft 14. A wheel 20 is fixed to the upper end of the screw shaft 14, and a handle 22 protruding upward is fixed to the wheel 20. When the handle 22 is gripped and the screw shaft 14 is rotated in the clockwise direction when viewed from above in FIG. 3, the lifting platform 18 is raised by the cooperation of the screw shaft 14 and the female screw hole, and the screw shaft 14 is moved upward in FIG. When it is rotated counterclockwise as viewed from the top, the elevator 18 is lowered by the cooperation of the screw shaft 14 and the female screw hole.

  Continuing the description with reference to FIG. 2, the spindle housing 24 is fixed to the left side of the lifting platform 18 in FIG. 2. A spindle 26 extending substantially vertically is rotatably mounted on the spindle housing 24. A rotary drive source (not shown), which may be an electric motor, is disposed in the spindle housing 24, and an output shaft of the rotary drive source is connected to the spindle 26. An end mill 28 is attached to the lower end of the spindle 26. The end mill 28 is preferably a cemented carbide flat end mill (that is, an end mill of a type in which the tip shape is flat and the blade is formed at the outermost diameter). In association with the end mill 28, a guide member 30 is disposed on the base 8 so as to extend straight in a direction perpendicular to the paper surface in FIG. 2 and to be adjustable in the left-right direction in FIG.

  Referring to FIG. 3 together with FIG. 2, the groove engraving process using a cutting machine will be described. As shown by a two-dot chain line in FIG. 2, the ray leather 2 with the support sheet 6 attached to the back surface is on the surface. Is placed on the base 8 facing upward. At this time, one side surface of the ray leather 2 is brought into contact with one side surface of the guide member 30, and the position of the ray leather 2 in the left-right direction in FIG. In FIG. 2, the leading end of the ray leather 2 is positioned somewhat in front of the end mill 28 in the direction perpendicular to the paper surface. The vertical position of the elevator 18 is set so that the cutting depth d of the end mill 28 (that is, the protruding length at which the tip of the end mill 28 protrudes downward beyond the surface of the ray leather 2) becomes a predetermined value. The cutting depth d is preferably about 0.1 to 2 mm. When the groove cutting preparation is thus completed, the rotational drive source is energized to rotate the spindle 26 at a high speed to rotate the end mill 28 at a high speed, and the ray leather 2 is gradually moved forward along one side surface of the guide member 30 ( In FIG. 2, the groove 32 (see also FIG. 4) is manually moved in the direction from the front to the back of the paper surface and the rightward direction in FIG. ). The rotation speed of the end mill 28 is preferably about 15000 to 25000 rpm. The outer diameter of the end mill 28, and thus the width W of the groove 32 to be engraved, is preferably about 0.8 to 1.5 mm. On the other hand, the depth D of the groove 32 to be engraved is preferably 0.3 to 0.7 mm, and the groove cutting as described above can be repeated a plurality of times as necessary.

  After the required grooves 32 are formed on the surface of the ray leather 2 in the groove engraving process, a peeling process is performed. In this peeling step, the support sheet 6 attached to the back surface of the ray leather 2 is peeled off. FIG. 4 shows the ray leather 2 in a state in which a sewing groove 32 is formed on the front surface and then the support sheet 6 is peeled off from the back surface. When an appropriate leather product is manufactured using such ray leather 2, a sewing needle (not shown) is made to act through the bottom surface of the sewing groove 32 of ray ray 2, and ray leather 2 and its leather Other materials such as cloth or cowhide laminated on the back can be sewn. The sewing thread is present in the sewing groove 32, and an attractive stitch appears on the surface of the ray leather 2.

  The preferred embodiment of the method for forming the sewing groove on the surface of the ray leather constructed according to the present invention has been described above in detail with reference to the accompanying drawings. However, the present invention is limited to the preferred embodiment. However, it is needless to say that various changes and modifications can be made without departing from the scope of the present invention. For example, in the illustrated embodiment, the ray leather 2 is moved along the guide member 30 in the groove engraving step. However, if desired, the ray leather 2 is kept stationary, and the end mill 28 is moved appropriately to make the groove. Cutting can also be performed. In this case, the spindle housing 27 is configured to be movable in an arbitrary direction, and the movement of the spindle housing 27, and hence the movement of the end mill 28 with respect to the ray leather 2, is controlled by a computer, and an appropriate curved shape corresponding to the design of the leather product It is also possible to form a sewing groove having an arbitrary shape including.

The slope view which shows the state which stuck the support sheet on the back surface of ray leather. The simplified front view which shows an example of the cutting machine which can be applied to a groove cutting process. The fragmentary sectional view which shows the groove | channel engraving process to which the cutting machine of FIG. 2 is applied. The slope view which shows the ray leather of the state which formed the groove | channel for sewing on the surface and peeled the support sheet from the back surface.

Explanation of symbols

2: Ray leather 4: Small particles 6: Support sheet 28: End mill 32: Sewing groove

Claims (6)

A pasting process for releasably pasting the support sheet to the back of the ray leather;
After the attaching step, the ray leather and the end mill are connected to the surface of the ray leather so that the end mill extends substantially perpendicularly and the end mill tip extends beyond the surface of the ray leather to obtain the required cutting depth. And the end mill is rotated and the ray leather is moved relative to the end mill in a direction parallel to the surface of the ray leather, thus forming a groove on the surface of the ray leather. A groove engraving process,
After the groove engraving step, a peeling step of peeling the support sheet from the back surface of the ray leather,
A method for forming a sewing groove on a surface of a ray leather, comprising:   The method of claim 1, wherein the support sheet is made of cardboard.   The method according to claim 1 or 2, wherein the end mill is rotated at a speed of 15000 to 25000 rpm.   The method according to any one of claims 1 to 3, wherein the outer diameter of the end mill is 0.8 to 1.5 mm, and the width of the groove to be engraved is 0.8 to 1.5 mm.   The depth of one groove cutting is 0.1 to 0.2 mm, and the groove cutting is repeatedly performed a plurality of times to form a groove having a depth of 0.3 to 0.7 mm. The method according to any one.   The method according to any one of claims 1 to 5, wherein the support sheet is attached to the back surface of the ray leather through a double-sided adhesive tape.

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