JPH06206192A - Cloth cutting device - Google Patents

Abstract

PURPOSE:To maintain the excellent cutting performance for a long period of time by moving a cutter part in reciprocation in the installation direction, forming the cutting edge of the cutter part to a tapered form, when cutting is performed by the traveling in the horizontal direction and allowing the cutting edge to contact a cloth only in a going cause or returning course. CONSTITUTION:A knife A for cutting a cloth has a tapered shaped cutting edge, and the upper part is held on a ball spline shaft 39 of a knife holding body by a pin 40. The knife holding body consists of a base body part 13, vertical movement part 14 which reciprocatingly moves in the longitudinal direction, and a turning part 15, and the ball spline shaft 31 which holds the knife A is supported in free elevation on a turning part 15 through a belt 35 and a crank mechanism 36 by a servomotor 27. The turning part 15 is installed on the vertical movement part 14 in free turn through a belt 47 by the operation of a servomotor 44, and the vertical movement part 14 is supported in free vertical movement along a shaft 16 through a screw mechanism 25 by the operation of a servomotor 19. Accordingly, the cutting edge of the knife A is directed always to the cutting direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth cutting device used for cutting cloth.

[0002]

2. Description of the Related Art A cloth cutting device which is fully automated as shown in FIG. 6 is used for cutting cloth when manufacturing clothes. In FIG. 6, reference numeral 50 is a cloth, 51 is a mounting table on which the cloth is placed, 52a and 52b are rails arranged on the mounting table 51, 53 is a saddle suspended between the rails 52a and 52b, and 54 is a rail 52a. , 52b is a servo motor for driving the roller 55 on the saddle 53, and when the servo motor 54 is operated, the saddle 53 causes the rail 52a,
It is configured to travel on the 52b in the YY direction.

Reference numerals 56a and 56b are rails arranged in parallel with the beam portion of the saddle 53, and a knife holder 57 is placed on the rails 56a and 56b. Knife holder 5
7 is a pulley 58 that is axially supported at both ends of the beam portion of the saddle 53.
The knife holder 57 travels on the rails 56a and 56b in the XX direction when the servomotor 60 mounted on the saddle 53 is connected to the belt 59 that is stretched around the a and 58b. Is configured.

Reference numeral B designates a knife having a substantially parallel width attached to the knife holder 57, and as shown in FIG.
₁ is provided. The knife B is configured to move back and forth (reciprocate) in the ZZ direction at high speed by the internal mechanism of the knife holder 57 to cut the cloth 50 into a predetermined shape. In the conventional cloth cutting device configured as described above, the traveling speed of the knife B in the XY directions and the knife B
From the relationship between the reciprocating speed in the ZZ direction and the minute clearance angle θ ₁ , the blade edge of the knife B is always in contact with the cloth 50 when the cloth is cut, and the cloth is cut by scraping.

By the way, in a state where the scraping action of the vertically reciprocating knife B is stopped (the top dead center and the bottom dead center of the knife B), the knife B is running in the XY directions while being in contact with the cloth. So, the cutting action like tearing the fabric,
The so-called "break" is performed. That is, a cloth cutting process by such a conventional cloth cutting device will be described with reference to FIG. Incidentally, FIG. 8 shows the cutting process of the knife B in five stages from O to S.

O: The knife B reaches the bottom dead center and its descending motion is stopped. However, the cutting edge of the knife B is moving forward while being in contact with the fabric for a short time while the descending motion is stopped, and the cutting is performed. P: The knife B is moving upward, its cutting edge is moving forward while being in contact with the cloth, and scraping is performed.

Q: The knife B reaches the top dead center, and its ascending movement is stopped. However, the cutting edge of the knife B is advancing while being in contact with the fabric for a short period of time during which the ascending motion is stopped, and cutting is performed. R: The knife B is in a descending motion, and its blade edge is advancing while being in contact with the cloth, and scraping is performed.

S: The knife B reaches the bottom dead center again, and its descending motion is stopped. However, the cutting edge of knife B is O
Similarly to the above, even during the slight time when the descending motion is stopped, the fabric is moving forward while being in contact with the fabric, and the cut-off is performed. As described above, the cutting condition of the cloth changes abruptly while the knife B reciprocates up and down, and at the top and bottom dead center, unreasonable cutting such as cutting is performed, so that the cloth is not damaged (for example, " Phenomenon called warp pulling out of the warp
Receive.

Further, since the cutting operation in which an excessive force is applied to the cutting edge is repeatedly performed, the sharpness of the cutting edge is sharply reduced, and the cutting edge must be frequently ground. Moreover, since the cutting of the cutting edge is carried out on the basis of the portion where the sharpness is most likely to become dull during cutting, the amount of polishing is inevitably increased.

[0010]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a cloth cutting device which can cut cloth at high speed and smoothly, has a good cutting condition, and is easy to maintain. The above-mentioned object of the present invention is a cloth cutting device comprising a blade portion, a reciprocating means for reciprocating the blade portion in a vertical direction, and a traveling means for traveling the blade portion in a horizontal direction, wherein the blade The blade edge of the part is configured in a taper shape, the blade edge abuts on the fabric only in one of the forward and the return of the blade portion, and in the other, the blade edge is configured to be separated from the fabric. Achieved by the featured fabric cutting device.

That is, the blade of the cloth cutting device is formed in a taper shape, and the cutting edge abuts on the cloth only during either the forward movement or the returning movement of the blade portion, and the cutting edge separates from the textile on the other side. Therefore, for example, when the blade part moves to the ascending motion, the blade part is largely separated from the cloth even when the blade part is moving in the horizontal direction, and the blade part moves to the descending motion. When the blade is moved, the blade portion presses the cloth from above and presses the cloth. Therefore, the cloth is not cut, and the cloth can be cut continuously and uniformly.

Furthermore, since no excessive force is applied to the cutting edge,
Even if used for a long period of time, sharpness is unlikely to deteriorate, and therefore the number of polishing operations and the amount of polishing are small, which is economical. The taper angle of the cutting edge is preferably about 15 to 25 °, that is, the cutting edge with this angle cuts the cloth most satisfactorily and the blade portion is sufficiently separated from the cloth.

[0013]

1 to 5 show one embodiment of a cloth cutting apparatus according to the present invention, FIG. 1 is a perspective view of the cloth cutting apparatus according to the present invention, and FIG. 2 is a knife holder of the cloth cutting apparatus. Sectional view of the body, FIG. 3 is a side view of the knife, FIG. 4 is a front view of the knife,
FIG. 5 is an explanatory view showing a knife cutting process.

In each drawing, A is a knife, and A ₁ , A ₂ and A ₃ are the back, belly and cutting edge of the knife A, respectively. As shown in FIG. 3, the side shape of the knife A is configured such that the cutting edge A ₃ contacting with the fabric forms an angle θ ₂ (about 20 °) with the spine A ₁ , and both side surfaces of the cutting edge A ₃ are formed. Are symmetrically polished as shown in FIG.

1 is a cloth, 2 is a mounting table on which the cloth 1 is placed, 3a and 3b are rails arranged on the mounting table 2, 4 is a saddle suspended on the rails 3a and 3b, and 5 is a rail 3
It is a servo motor for driving the rollers 6 mounted on a and 3b, and when the servo motor 5 is operated, the saddle 4 travels on the rails 3a and 3b in the YY direction.

Reference numerals 7a and 7b denote rails arranged in parallel with the beam portion of the saddle 4, and a knife holder 8 is placed on the rails 7a and 7b. The knife holder 8 is a saddle 4
Is connected to a belt 10 which is stretched around pulleys 9a and 9b axially supported at both ends of the beam portion. Is configured to travel in the XX direction.

The upper end of the knife A has a knife holder 8
The knife A is housed inside, and the knife A is reciprocated at high speed in the ZZ direction by the internal mechanism of the knife holder 8,
The fabric 1 is cut into a predetermined shape in combination with traveling in the Y direction. Next, the internal mechanism of the knife holder 8 will be described in detail with reference to FIG. 12a, 1
Reference numeral 2b is a rail guide attached to the knife holder 8, and the rail guides 12a and 12b are rail guides 7a and 7b.
a, 7b, and is configured to guide the traveling of the knife holder 8 in the XX direction.

Reference numerals 13, 14 and 15 respectively denote a base portion, a vertical moving portion and a turning portion of the knife holder 8, and the vertical moving portion 14 is connected to the base portion 13 via a shaft 16 and a bearing 17. The turning portion 15 is rotatably connected to the vertical movement portion 14 via a bearing 18. 19 is the base portion 1
Servo motor fixed to 3, 20 is servo motor 19
The pulley attached to the rotating shaft of 21 is also a pulley,
In the pulley 21, the base portion 13 has a bearing 22a,
An upper end portion of a screw shaft 23 arranged via 22b is attached. Also, the pulley 20 and the pulley 21
The toothed belt 2 for driving force transmission that also serves to prevent displacement
4 is stretched, and the driving force of the servo motor 19 rotates the screw shaft 23.

Reference numeral 25 denotes a nut portion fixed to the vertically moving portion 14. Since the screw shaft 23 and the nut portion 25 form a ball screw mechanism, when the servomotor 19 is operated, the screw shaft 23 rotates. The vertical movement unit 14 is configured to move up and down relatively to the base unit 13. The vertical movement of the vertical movement unit 14 is necessary for precise vertical positioning when polishing the knife A.

Reference numeral 26 is a spring whose upper end is attached to the base portion 13 and whose lower end is attached to the vertical moving portion 14 so as to suspend the vertical moving portion 14. The tension of this spring 26 causes the ball screw mechanism to move vertically. The force exerted on 14 is counteracted, and the vertical movement unit 14 is kept stable. Reference numeral 27 is a drive motor fixed to the up-and-down moving unit 14, 28 is a pulley attached to the rotary shaft of the drive motor 27, and 29 is also a pulley, which is arranged on the revolving unit 15 via a spring 30 and a support rod 31. It is pivotally supported by the pulley base 32.

33 is also a pulley, and this pulley 33 is mounted on a shaft 34 which is rotatably supported by the swivel portion 15. Reference numeral 35 is a belt for transmitting the driving force of the drive motor 27 via the pulleys 28, 29 and 33, and an appropriate tension is applied to the belt 35 by the elastic force of the spring 30 via the pulley 29. Has been done.

A crank mechanism 36 is formed on the side of the shaft 34 opposite to the side where the pulley 33 is attached. Further, one end of a plate-shaped crank rod 37 is rotatable on the eccentric shaft of the crank mechanism 36. Installed on. Further, a ball spline bearing 38 is provided at the other end of the crank rod 37.
An upper end of a ball spline shaft 39, which is arranged to be vertically movable on the revolving portion 15 via the, is swingably attached.

That is, the rotational force of the drive motor 27 causes the belt 3 to rotate.
5, the crank mechanism 36 transmits the rotational motion to reciprocating motion, and the crank mechanism 36 further reciprocates the ball spline shaft 39 up and down. Here, the vertical stroke of the knife A (double the distance between the eccentric shafts of the shaft 34 and the crank mechanism 36) is set to be shorter than the projected dimension L of the cutting edge A _{3 in} the spine A ₁ direction. It

40 is a ball spline shaft 39 and a knife A
, 41 is a dish-shaped presser plate for pressing down the cloth to be cut, and the presser plate 41 is provided with a hole for inserting the knife A in the center thereof. It is attached to a shaft 42 that is vertically movable. Reference numeral 43 is a spring interposed between the large diameter portion 42a of the shaft 42 and the swivel portion 15. The elastic force of the spring 43 causes the presser plate 41 to apply an appropriate pressing force to the cloth 1, The fabric is configured to be fixed securely.

Reference numeral 44 denotes a servo motor fixed to the vertical moving section 14, and a pulley 45 is attached to the rotary shaft of the servo motor 44. Reference numeral 46 is a pulley having the knife A as a virtual center axis, and the pulley 46 is integrated with the turning portion 15. A toothed belt 47 is stretched between the pulley 45 and the pulley 46, and when the servo motor 44 is operated, the driving force of the servo motor 44 is transmitted to the pulley 46 via the toothed belt 47, and turns. The part 15 is configured to rotate relative to the vertically moving part 14.

Although not shown in detail, reference numeral 48 denotes a polishing mechanism for the cutting edge A ₃ , which has a driving means for rotating the grindstone,
And a support means for supporting the grindstone so that it can be brought into contact with and separated from the blade portion A. The cloth cutting device configured as described above is
When a predetermined cutting pattern is input to the pointing device (not shown) in advance, the cloth 1 automatically fixed on the mounting table 2 is
The knife holder 8 moves in the XY directions, and at the same time, the knife A
Since the cloth reciprocates up and down, the cloth 1 is cut into a predetermined shape.

Moreover, the swivel portion 15 is swung appropriately,
Since the blade edge A _{3 of the} knife A always faces the cutting direction, good cutting is performed. Next, the cloth cutting process will be described with reference to FIG. In addition, FIG. 5 shows a process of cutting the fabric 1 while the knife A reciprocates up and down once in five stages of O ′ to S ′.

O ': The cutting edge A ₃ of the knife A is in a state in which the cloth 1 is pressed and cut by a predetermined length, and the descending movement of the knife A is stopped, but the cutting edge A ₃ is cut before the cloth 1 is cut. Away from. P ′: The knife A is moving upward, and at the same time, the cutting edge A ₃ is further separated from the fabric 1 even though it is running in the horizontal direction.

Q ': The ascending movement of the knife A is stopped, and then the descending movement is started. Then, the pressing of the cloth 1 is started in combination with the horizontal movement of the knife A. R ′: The knife A is descending, and at the same time, it is traveling in the horizontal direction, and the cloth 1 is pushed by the cutting edge A ₃ . S ′: The knife A is in a state of pressing the fabric 1 again for a predetermined length, and the descending movement of the knife A is stopped, but the knife A is separated from the fabric 1 before the cutting.

Since the cutting action which is repeatedly performed as in the above O'-S 'is "push-cutting" which is made by forcibly pressing the knife A onto the cloth 1 from above, the fiber is surely cut. This ensures cutting with high dimensional accuracy. Moreover,
The cutting speed is easy to manage, and the cutting is performed only by the pressing action.Therefore, the cloth is not cut, and the work progresses continuously in a uniform cutting condition. Does not occur.

Furthermore, the cutting action of the knife A is compulsory,
Since no excessive force is applied to the cutting edge, sharpness is less likely to occur, and the number of times the blade is polished and the amount of polishing can be significantly reduced. Therefore, the working efficiency can be improved and the running cost can be reduced, and the amount of floating dust generated can be drastically reduced to improve the working environment.

[0032]

According to the cloth cutting device of the present invention, the cloth can be cut at high speed and smoothly, the cutting condition is good, and the maintenance is easy.

[Brief description of drawings]

FIG. 1 is a perspective view of a cloth cutting device according to the present invention.

FIG. 2 is a cross-sectional view of a knife holder of the cloth cutting device according to the present invention.

FIG. 3 is a side view of a knife of the fabric cutting device according to the present invention.

FIG. 4 is a front view of a knife of the cloth cutting device according to the present invention.

FIG. 5 is an explanatory view of a cutting process by the cloth cutting device according to the present invention.

FIG. 6 is a perspective view of a conventional cloth cutting device.

FIG. 7 is a side view of a conventional cloth cutting knife.

FIG. 8 is an explanatory view of a cutting process by a conventional cloth cutting device.

[Explanation of symbols]

A knife A ₃ cutting edge 1 cloth 2 mounting table 4 saddle 8 knife holder 13 base part 14 vertical movement part 15 swivel part

Claims (2)

[Claims] 1. A fabric cutting device comprising a blade portion, a reciprocating means for moving the blade portion in a vertical direction, and a traveling means for traveling the blade portion in a horizontal direction. The cutting edge is configured in a taper shape, and the cutting edge abuts on the fabric only in one of the forward direction and the returning time of the blade portion, and in the other, the cutting edge is configured to be separated from the fabric. Fabric cutting device. 2. The fabric cutting device according to claim 1, wherein the taper angle of the cutting edge is about 15 to 25 °.