JPH0386493A - Cutting device for sheet material - Google Patents

Abstract

PURPOSE:To maintain the best edge tip of a cutting blade and to make it in a longer life by arranging a grinding wheel and polishing wheel freely retreatably respectively from the cutting blade at the position of the both sides interposing the blade. CONSTITUTION:In order to grind or polish the edge tip of a cutting blade 23, an edge tip control mechanism 33 is operated and the edge tip direction is positioned and fixed. Thereafter, a grinding wheel 70 or polishing wheel 72 is moved toward the cutting edge 23 and the grinding grindstone 70 or polishing wheel 72 subjected to a high speed rotating is brought into contact with the blade 23. Then, a cylinder 61 is operated telescopically and the blade 23 is vertically moved. This edge tip is thus ground or polished.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apparatus for cutting flexible sheet materials such as woven fabrics, and more specifically, a device for cutting flexible sheet materials such as woven fabrics, and more specifically, a method for cutting the cutting edge of a cutting blade for cutting sheet materials as the cutting edge decreases. This invention relates to a cutting device that maintains the best cutting edge by grinding and polishing.

<Conventional technology> In order to simultaneously cut a large number of stacked sheets of flexible sheet materials such as woven fabrics and synthetic resin sheets, the sheet materials are suctioned and fixed using air-permeable bristles and are moved vertically back and forth. A cutting device is used in which a cutting blade is moved relative to the sheet material.

As shown in FIGS. 5 and 6, the above-mentioned sheet material cutting device has an air-permeable bristle body 1 supported by a pair of endless running bodies 2 and 2, which are arranged so as to move on a suction box 3. The group of bristles forms a cutting support surface on the suction box 3, and the cutting blade 5 of the cutting device 4, which is movable in any direction, is placed above the cutting support surface. The sheet material A is placed on top, and it is fixed on the bristle body 1 by the suction force applied from the suction box 3 to the surface of the bristle body 1 by the suction device 6 and the suction duct 7, and in this state, the cutting device 4 The cutting blade 5 is vertically reciprocated and moved in the X and Y directions under preset conditions to cut the sheet material A into a predetermined shape.

By the way, in the sheet material cutting device as described above,
What is most important and requires attention is the management of the cutting edge of the cutting blade 5 in the cutting device 4.

How this is managed greatly affects the life of the cutting blade, cutting accuracy, and production volume, and is also an important factor that can lead to breakage of the cutting blade in the worst case scenario.

For this reason, conventional cutting devices are equipped with a cutting blade edge grinding device on the cutting device, as disclosed in Japanese Patent Publication No. 5G-5159, Japanese Patent Publication No. 56-8759, etc., in order to maintain the best cutting edge. The structure is such that the cutting edge is frequently re-ground in short cycles using a grinding wheel.

<The problem that the invention seeks to solve.

However, the above-mentioned conventional cutting blade edge grinding equipment uses a grinding wheel to frequently grind the cutting blade edge, which causes a lot of wear and tear on the expensive cutting blade and grinding wheel, resulting in a short lifespan. Since grinding is repeated even when grinding is not necessary, such as removing pars from the cutting edge or removing foreign matter adhering to the cutting edge, a large amount of abrasive grains from the grinding wheel and chips from the cutting blade are scattered onto the top surface of the cutting sheet material. , there is a problem of significant pollution.

In addition, the amount of cut for cutting edge grinding is determined by the inertial pressure cut caused by the rotational centrifugal force of an eccentrically mounted grinding device, or by the pressing force cut caused by a spring, pneumatic cylinder, electromagnetic force, etc. There is a problem that there is no control, it is vague and unstable, the loss of wear and tear of the cutting blade and grindstone is enormous, the cutting edge is prone to cracking and chipping, and the life is short.

Furthermore, in the method of moving the cutting edge for grinding the cutting edge, the grinding wheel rotates and moves into the cutting based on a fulcrum on the center line in front of the cutting edge, and the cutting blade reciprocates up and down to grind the entire length of the cutting edge, so the angle of the cutting edge is The angle tends to gradually become sharper with each grinding, and the amount of grinding on the ventral surface of the cutting blade, which is unnecessary for the purpose of grinding the cutting edge, is large, causing unnecessary wear and loss of the grinding wheel, and furthermore, the rigidity of the cutting edge is impaired, making it unstable. The poor conditions of on-machine grinding also tend to cause the cutting edge to crack and chip, resulting in accelerated cutting edge wear.

In addition, since the conventional grinding device described above obtains rotation through a device that can selectively engage with the cutting blade rotation shaft, it is mechanically difficult to obtain the high speed rotation and rotation accuracy necessary for grinding. Since the grinding contact part between the grinding wheel and the cutting blade is in surface contact, the grinding resistance is large, and the structure tends to cause clogging of the grinding wheel, heat generation, paring of the cutting edge, and chipping, making precision grinding of the cutting blade difficult.

Therefore, in order to solve the above-mentioned problems, the purpose of this invention is to reduce wear and tear of expensive cutting blades and grindstones, prevent parsing and chipping of the cutting edge, and enable precision grinding of the cutting blade to reduce fine powder particles. An object of the present invention is to provide a sheet material cutting device that can prevent environmental pollution and contamination of the upper surface of cut sheet materials due to scattering of the materials.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a cutting blade that is connected to a cutting blade that is held so as to be vertically movable and rotatable, and that imparts vertical reciprocating motion to the cutting blade. The cutting blade drive mechanism is supported by a cylinder so as to be movable up and down, and the cutting blade is linked with a cutting edge control mechanism that rotates and displaces the direction of the cutting edge around the rotation axis, and the cutting blade is connected to the cutting blade at positions on both sides of the cutting blade. The grinding wheel and polishing wheel are arranged so that they can move forward and backward relative to the cutting blade.

To grind or polish the cutting edge of the cutting blade, operate the cutting edge control mechanism to position and fix the cutting edge, then move the grinding wheel or abrasive wheel toward the cutting blade, and rotate the grinding wheel at high speed. Alternatively, when the polishing wheel comes into contact with the cutting blade, the cylinder is expanded and contracted to move the cutting blade up and down, thereby grinding or polishing the cutting edge.

Exemplary Flow Side> Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

1 to 3 show the structure of the cutting device, and the fifth
It is disposed above the cutting support surface in the sheet material cutting apparatus shown in FIG. 6 and FIG. 6 so as to be movable in the X direction and the Y direction.

In FIGS. 1 and 2, a carriage 13 equipped with a spindle head 12 is mounted on a guide rail 11 on a cross rail 11 arranged to move in the X direction on the upper part of the cutting support surface.
4.15 and guide units 16.17 so as to be movable in the Y direction, and the carriage 13 is moved in the Y direction by numerical control using a ball screw 18 with NG.

A housing/saddle 20 is attached to the front surface of a column 19 erected on both sides of the upper surface of the carriage 13 so as to be movable up and down by a guide rail 21 and a guide unit 22 provided on the front surface of the column 19. A drive mechanism 24 for vertically reciprocating the cutting blade 23 is incorporated, and a drive motor 25 is attached to the rear surface of the saddle 20.

In the illustrated case, the drive mechanism 24 uses a planetary gear mechanism, and as shown in FIG. A sun gear 27 rotatably supported and fixed to the crankshaft 26 and an internal gear 2 fixed to the saddle 20
Planetary gears 29 and 29 meshing with the respective gears 8 and 8 are pivotally fixed to the rotating shaft, and a rod 30, a swivel joint 30a, and a spindle 31 are connected to an eccentric shaft portion 26a provided eccentrically by an eccentric amount es at the tip of the crankshaft 26. A cutting blade 23 is connected to the cutting blade 23.

In the drive mechanism 24, when the drive motor 25 is started, the crankshaft 26 revolves at a radius of eccentricity e, and the cutting blade 23 is
In addition to imparting a vertical reciprocating motion with a stroke of e, the eccentric shaft portion 26a of the crankshaft 26 simultaneously revolves and has an eccentric amount e,
The cutting blade 23 rotates on its axis with a radius of , adds vertical vibration motion to the vertical reciprocating motion of the cutting blade 23, prevents the occurrence of a push-cut state when cutting the sheet material A, and takes advantage of the advantages of vibration cutting to achieve a high cutting speed. It makes it possible to

As shown in FIG. 2, the spindle head 1 of the carriage 13
A sleeve 32 with gears passing vertically through the interior of the sleeve 2 is rotatably supported by upper and lower bearings 33 and 34, and the spindle 31 of the cutting blade 23 is rotated vertically within a spindle bearing 35 fixed inside the sleeve 32. A key 37 of the spindle 31 is slidably fitted into a key groove 36 provided in the axial direction of the inner circumferential surface of the spindle bearing 35, and a key 37 of the spindle 31 is held at the lower end of the spindle 31 so as to protrude downward from the spindle bearing 35. It guides the vertical reciprocating motion of the cutting blade 23 attached to the cutting blade 23 and connects the cutting blade 23 and the geared sleeve 32 in the rotational direction.

A blade edge control mechanism 38 is mounted on the carriage 13 via a toothed sleeve 32 to direct the edge of the cutting blade 23 in a desired direction.

This cutting edge control mechanism 38 has a toothed pulley 41 attached to the output shaft 40 of a servo motor 39 fixed on the carriage 13, and a toothed pulley 43 attached to the upper end of the geared sleeve 32 via a clamping sleeve 42. Pulleys 41 and 43 are formed in conjunction with a toothed belt 44, and the cutting edge of the cutting blade 23 can be directed in any direction by driving a servo motor 39 through numerical control using NG.

An upper base plate 45 is fixed to the lower surface of the spindle head 12, and a lower base plate 47 is fixed directly below the upper base plate 45 via a frame bracket 46. A slide base plate 48 is provided on the lower surface of the lower base plate 47. , a plurality of guide shafts 49 passing through the upper and lower plates 45, 47.
and a plurality of cylinders 5 fixed to the lower base plate 47.
It is installed so that it can move up and down at 0.

A disk-shaped sheet material presser plate 51 is fixed to the lower surface of the slide base plate 48 , and when the sheet material A is cut by the cutting blade 23 , the cylinder 50 is extended and the presser plate 51 is lowered together with the slide base plate 48 . The upper surface of the sheet material A is slidably held down by the cutting blade 23 so that the sheet material A can be cut smoothly without being pulled up by the cutting blade 23.

A presser plate 51 is located at the center of the slide base plate 48.
A guide roller housing 52 is rotatably attached via a bearing to the area surrounded by the housing 5.
The back and both sides of the cutting blade 23 are movably supported by a guide roller 53 pivotally connected to the cutting blade 23, and the rigidity is increased by supporting the back and both sides of the cutting blade 23 that cuts the sheet material A. ing.

In order for this guide roller 53 to rotate together with the cutting blade 23, a slide shaft 54 that passes through the upper and lower base plates 45, 47 so as to be able to move up and down is held by the slide base plate 48 so that it can move up and down together. death,
Binion gear 55 fixed to the lower end of this slide shaft 54
is engaged with a gear 56 provided on the lower outer periphery of the guide roller housing 52, and a long pinion gear 57 fixed on the upper part of the slide shaft 54 is engaged with a gear 58 provided on the lower end outer periphery of the sleeve 32. 32, the guide roller housing 52 rotates synchronously with each of the gears and the slide shaft 54.

a drive mechanism 24 that provides vertical reciprocating motion to the cutting blade 23;
Both sides of the saddle 20 are supported to move up and down by a pair of cylinders 6e and 61 fixed upright on the carriage 13, and a stopper cylinder 62 is fixed on the carriage 13 to receive the center of the lower surface of the saddle 20. .

The stopper cylinder 62 simply supports the saddle 20 at the upper end of the piston rod when extended, and in its contracted state, the cutting blade 23 penetrates the sheet material A, and in its extended state, the cutting edge of the cutting blade 23 penetrates the sheet material A. The saddle 20 is pushed up to a position where it can be pulled out.

Therefore, the stroke s1 of the stopper cylinder 62 is
This is a stroke for inserting and removing the cutting blade 23 into and out of the sheet material A, and the cutting blade 23 is inserted into and removed from the sheet material A after cutting the sheet material A.
The cylinders 61 and 61 on both sides are used to cut the cutting blade 2 which is pushed up by the stroke S by the stopper cylinder 62.
3 is moved further upward by a stroke s2 for grinding or polishing.

The stopper cylinder 62 includes cylinders 61 and 6 on both sides.
Therefore, even if the stopper cylinder 62 is extended, it will overcome the cylinders 61 and 61 on both sides and push the cutting blade 23 up by the stroke S. The expansion and contraction of the cylinders 61 and 61 on both sides is performed by applying a stroke S to the cutting blade 23.
This will give a vertical movement of only 2.

Moreover, when the stopper cylinder 62 is contracted, the movement of the stroke S1 of the cutting blade 23 penetrating the sheet material A is given by the cylinders 6I and 61 on both sides.

Therefore, the total stroke of cylinders 61 and 61 on both sides is S++
It becomes the total of Sz.

As shown in FIG. 3, on the lower surface of the upper base plate 45, there are grinding wheel mechanisms 63 at positions on both sides of the cutting blade 23.
and a polishing wheel mechanism 64 are fixed to the cutting blade 23 in such a manner that they can move forward and backward.

The grinding wheel mechanism 63 moves the holder 66 of the slide unit 65 to the shaft 6 by supplying air from the air piping joint 67.
The air motor type spindle unit 69 is fixed to the holder 66 so that its axis is perpendicular to the direction of movement, and the grinding wheel 70 is attached to the rotating shaft of the spindle unit 69. It has a structure in which the forward position is adjusted with a micro-adjust stopper 71.

As shown in FIG. 2, this grinding wheel mechanism 63 is arranged so that the grinding wheel 70 faces the side surface of the upper end position of the stroke S2 of the cutting blade 23, and a grinding wheel 70 rotated at high speed by a spindle unit 69 is held in a holder 66. to move the cutting blade 2
3 and cylinders 61.3 on both sides. At '61, the cutting blade 23 is moved up and down by the stroke S2 to grind the cutting edge.

Note that the grindstone 70 can be exemplified by a diamond grindstone, a borazon grindstone, etc., and the air motor type spindle unit 69 can be replaced with an electric motor type spindle unit.

Further, the polishing wheel mechanism 64 has substantially the same structure as the grinding wheel mechanism 63 described above, and the same parts are given the same reference numerals and the description thereof will be omitted.

In this polishing wheel mechanism 64, a polishing wheel 72 attached to the rotating shaft of a spindle unit 69 is arranged in parallel with a grinding wheel 70 with the cutting blade 23 in between. The cutting edge of the cutting blade 23 is polished to remove pars from the cutting edge after grinding, to remove foreign matter adhering to the cutting edge by cutting, and to give the cutting edge a mirror-polished finish.The polishing wheel 72 is equipped with a puff material wheel, a soft wrap material wheel, etc. A soft abrasive material is used.

The sheet material cutting device of the present invention has the above-mentioned configuration, and the stopper cylinder 62 of the cutting device sucks and fixes the sheet material A stacked in large numbers on the cutting support surface and stops it at a predetermined position. and cylinders 61.61 on both sides
is contracted, the cutting blade 23 is lowered to penetrate the sheet material A, and the driving mechanism 24 causes the cutting blade 23 to vertically reciprocate by stroke 2e, and at the same time
The sheet material is shaped into a predetermined shape by simultaneously adding a vertical vibration motion of ea, and controlling the movement of the cutting device in the X and Y directions and the direction of the cutting edge by the cutting edge control mechanism 38 according to preset conditions. Cut it and go.

To grind the cutting blade 23, use the stopper cylinder 6.
2 is extended and the cutting blade 23 is stroked S.

the cutting blade 23 is pulled out from the sheet material A, and the direction of the cutting edge is set by the blade edge control mechanism 38.

In this state, the grinding wheel 70 of the grinding wheel machine t*63 is rotated at high speed, and the holder 66 is moved to bring it into contact with the cutting edge of the cutting blade 23, and the cylinders 61 and 61 on both sides are extended, and the cutting blade 23 is moved by the stroke S2. The cutting blade 23 is raised and moved up and down several times within the range of stroke S2 as necessary to grind the cutting edge.

Further, the cutting edge of the cutting blade 23 is polished in the same manner.

FIG. 4 shows the relationship between the cutting blade 23 and the grinding wheel 70. The cutting blade 23 rotates around the axis of the spindle 31 to control the direction of the cutting edge and the amount of cutting into the grinding wheel. The cutting blade has cutting edge surfaces on both sides at an angle of α, so the solid line in the figure shows the initial grinding state,
The cutting edge surface contacts the cylindrical outer peripheral surface of the whetstone 70 for grinding.

The cutting blade 23 is rotated around the axis as the cutting edge wears to control the direction of the cutting edge and the amount of grinding cut, and as shown by the two-dot chain line in Fig. 4, the position of the angle β is the final edge life limit. It is in the grinding state.

That is, during repeated grinding many times, the orientation of the cutting blade 23 and the amount of cutting cut are controlled while rotating the cutting blade 23 around the axis, so the grinding angle gradually becomes obtuse, and in the initial stage, the entire surface of the cutting blade at angle α is Even if the grinding wheel 70 is ground, as the number of times of grinding increases, a small portion of the cutting edge surface required for cutting will be intensively ground, and as a result, the amount of grinding will gradually decrease, and the wear loss of the grinding wheel 70 will also increase. As the amount decreases, the rigidity of the cutting edge increases, making it advantageous for machine grinding, which is unstable and has poor conditions.
It can prevent sharpening and chipping of the cutting edge and improve wear resistance.

When the cutting blade 23 moves up or down by the stroke S2 and the entire length of one side of the cutting edge can be ground, the grindstone 70 returns to the position away from the cutting blade 23, and by reversing the cutting blade 23 in this state, the remaining one side is also ground. It can be ground as well.

The grinding position of the grindstone 70 relative to the cutting blade 23 (dimension a...see FIG. 4) is accurately set by the adjustment stopper 71, improving grinding accuracy.

The edge grinding of the cutting blade 23 uses a rotating shaft center to always make a controlled minute amount of cut, so the cutting edge is less prone to cracking and chipping, and the grinding wheel 70
It is possible to extend the life of the polishing wheel 72 and the cutting blade 23, and to accurately manage the number of times of grinding, replacement timing, etc.

For example, if the initial cutting edge angle is 24°, the final cutting edge angle (life angle) is 35°, and turning cutting is performed alternately around the axis for 1 minute each on each cutting edge, the number of grinding times can be obtained.

The same thing can be said for polishing, and depending on the conditions of the cutting edge of the cutting blade 23, the rotating movement of the cutting blade 23 and the forward movement of the grinding wheel 7o may be performed in the opposite order to the above-mentioned order. can.

<Effects of the Invention> As described above, according to the present invention, since it has the above structure, it has the following effects.

Grinding and polishing of the cutting blade can be selected using a grinding wheel and a polishing wheel, so it is possible to re-grind worn cutting edges, remove burr from the cutting edge after grinding, and remove foreign matter (e.g. carbide, deposits, fat, etc.) attached to the cutting edge due to cutting. The cutting blade can be selectively finished with a mirror-polished finish, allowing the cutting blade to maintain its best cutting edge and extend its life.

The cutting blade can always make a controlled small amount of cut into the grinding wheel or polishing wheel, suppressing the occurrence of pars and chipping on the cutting edge, prolonging the life of the grinding wheel, polishing wheel, and cutting blade, and increasing the number of times of grinding. , it becomes possible to accurately manage the replacement timing, etc.

(2) The cutting blade is rotated to a predetermined cutting position, the grinding wheel or polishing wheel is moved forward to the fixed position, and the cutting blade reciprocates up and down to grind or polish the entire length of the cutting edge surface, so the cutting edge angle is The angle tends to gradually become obtuse with each grinding, making it possible to intensively grind and polish the cutting edge surface required for cutting edge grinding, and gradually reduce the amount of unnecessary cutting (D) on the cutting edge surface. In addition to reducing wear and tear on the grinding wheel, the rigidity of the cutting edge increases, making it advantageous for on-machine grinding under unstable and poor conditions, preventing paring and chipping of the cutting edge, and improving wear resistance.

(ff) Due to the above (D to (G)), the amount of contamination on the upper surface of the cut sheet material due to detached abrasive grains and grinding chips is extremely small.

(V) The grinding wheel and polishing wheel are mounted and driven by independent air motor spindle units, allowing for high rotation accuracy and ultra-high speed rotation, and the contact area between the grinding wheel and cutting blade is also in line contact. Grinding resistance is low, clogging of the grindstone, heat generation, cutting edge paring, and chipping are less likely to occur, and precision grinding and polishing of the cutting edge is possible.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of a sheet material cutting device according to the present invention, Fig. 2 is a longitudinal sectional front view taken along arrows ■-H in Fig. 1, and Fig. 3 is a transverse sectional view taken along arrows III-III in Fig. 2. bottom view,
FIG. 4 is an explanatory view showing the relationship between the cutting blade and the grinding wheel, FIG. 5 is a longitudinal sectional front view showing the entire sheet material cutting device, and FIG. 6 is a longitudinal sectional side view of the same. 11... Cross rail 12... Spindle head 13... Carriage 19... Column 20... Saddle 23... Cutting blade 2
4... Drive mechanism 31... Spindle 3
8...Blade edge control mechanism 39...Servo motor 51...Sheet holding plate 61...Cylinder 6
2... Stopper cylinder 63... Grinding wheel mechanism 64... Polishing wheel mechanism 70... Grindstone 71... Stopper 72... Grinding wheel

Claims (1)

[Claims] A cutter drive mechanism is connected to a cutting blade which is held so as to be vertically movable and rotatable, and which imparts vertical reciprocating motion to the cutting blade, and is supported by a cylinder so as to be able to move up and down. A cutting edge control mechanism that rotates and displaces the direction of the cutting edge around the center is interlocked, and a grinding wheel and a polishing wheel are arranged on both sides of the cutting blade so that they can move forward and backward with respect to the cutting blade. Sheet material cutting equipment.