JPH07136989A - Cutting blade polishing quantity control device and method therefor - Google Patents

Abstract

PURPOSE:To control the polishing quantity of a cutting blade to the optimum quantity so as to prolong the service life of the cutting blade and a grinding wheel and to stabilize the cutting quality of the cutting blade. CONSTITUTION:A cutting blade 6 is polished every predetermined polishing cycle by polishing rollers 53a, 54a, and the blade width of the cutting blade 6 is measured every predetermined polishing frequency by a blade width detecting means 60. The measured value of the blade width is fed back to a control device 2, and the polishing time of the cutting blade 6 by the polishing rollers 53a, 54a is controlled to be appropriate. When the polishing time is needed long, it is so judged that the service life of the polishing rollers 53a, 54a came to an end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade polishing amount control apparatus and method in a cutting machine which automatically cuts a sheet material such as cloth under computer control and also appropriately grinds the cutting blade.

[0002]

2. Description of the Related Art Conventionally, woven fabrics such as cloth, knitted fabrics, paper,
To cut a flexible sheet material such as plastic or leather, a cutting machine that automatically cuts by computer control is used. The cutting blade that cuts the sheet material loses sharpness when cutting continues,
Since good cutting results cannot be obtained, it is necessary to frequently polish. For this reason, it is necessary to equip the cutting machine with a cutting blade polishing device and perform cutting while polishing.

Typical prior art of a cutting machine equipped with a polishing device is, for example, Japanese Patent Publication No. 57-14957 and Japanese Patent Laid-Open No. 57-57957.
It is disclosed in Japanese Patent Laid-Open No. 194865. In these prior arts, a polishing mechanism is provided near the cutting blade so that polishing can be performed between cutting operations or during cutting operations.

[0004]

SUMMARY OF THE INVENTION In the above-mentioned prior art,
Although a mechanism for polishing the cutting blade is disclosed, the idea of controlling the amount of polishing, which is the amount of wear of the cutting blade due to polishing, is not shown. However, if the polishing amount is insufficient, the cutting is performed without recovering the sharpness of the cutting blade, and a good cutting result cannot be obtained. If the amount of polishing is too large, the cutting blade and the grindstone will wear out faster and their life will be shortened.

FIG. 12 shows an example of an experimental result regarding the relationship between the number of times of polishing of a cutting blade and the amount of polishing. When the polishing is repeatedly performed with the conditions kept constant, the relationship between the number of times of polishing and the polishing amount is not a linear relationship as indicated by a two-dot chain line but a curved curve that is generally upwardly convex as indicated by a solid line. Polishing frequency is 2
It is estimated that the polishing amount becomes smaller than the straight line represented by the chain double-dashed line when the polishing amount is more than 000 times. It is considered that such a change in the polishing amount is caused by the performance deterioration due to clogging or abrasion of the polishing grindstone.

When the cutting machine is provided with a polishing mechanism as in the above-mentioned prior art, when the polishing is carried out automatically, the performance of the grindstone is expected to decrease, and a large amount of polishing is performed with a margin. Is common. For this reason, the cutting blade and the grindstone wear faster and the service life is shortened. In addition, the deterioration of the grinding performance of the grindstone cannot be grasped accurately, so when replacing or inspecting the grindstone, it often depends on the operator's intuition, and the cutting blade is stable and has a long cutting life. Will be difficult to do.

FIG. 13 shows a general relationship between the polishing time and the polishing amount. FIG. 13A shows the relationship between the cumulative polishing time and the polishing amount of the grindstone, and FIG. 13B shows the relationship between the polishing time and the polishing amount for each cutting blade. FIG.
As shown in (A), as the accumulated polishing time of the grindstone increases, the polishing amount indicated by the solid line deviates from the straight line indicated by the two-dot chain line. Therefore, in the initial state of the grindstone in the period from t0 to t1, the polishing performance as shown by the straight line La in FIG. 13B is obtained, but in the final state of the grindstone in the period shown in t2 to t3. , Lb. When the polishing performance is represented by a straight line of Lb, it takes a longer time to give the same amount of polishing to the cutting blade than when the polishing performance is La, the efficiency is poor, and the life of the grindstone is shortened. To be judged. That is, the life of one grindstone is when the polishing amount reaches A. The time for which the polishing amount, which is the life for one cutting blade, is B is much shorter than the time for determining the life of the grindstone.
As described above, the polishing performance of the grindstone largely changes according to the polishing time accumulated by the grindstone, and the polishing amount of the cutting blade also changes according to the polishing performance of the grindstone.

An object of the present invention is to provide a cutting blade polishing amount control device and method capable of automatically measuring an actual polishing amount for a polishing operation of a cutting blade and controlling the polishing amount optimally.

[0009]

SUMMARY OF THE INVENTION The present invention is a device for controlling the amount of cutting blades, which is repeatedly polished according to a predetermined condition while the cutting machine is in operation. In response to the output from the measuring means and the measuring means, the measured polishing amount is compared with a predetermined proper polishing amount, and when the polishing amount is excessive, the polishing amount in the next polishing is decreased, and the polishing amount is insufficient. In this case, the cutting amount control device for increasing the polishing amount in the next polishing to bring the polishing amount in the next polishing close to the proper polishing amount.

The measuring means of the present invention is characterized by measuring the blade width of the cutting blade to measure the polishing amount.

Further, the control means of the present invention is characterized in that the polishing amount is decreased or increased by decreasing or increasing the polishing time in one polishing.

Further, the present invention is a method for controlling the polishing amount of a cutting blade which is repeatedly polished according to a predetermined condition during the operation of the cutting machine, wherein the polishing amount of the cutting blade is measured every predetermined period, Compare the measured amount of polishing with a predetermined appropriate amount of polishing, reduce the amount of polishing in the next polishing when excessive polishing, increase the amount of polishing in the next polishing when insufficient polishing, in the next polishing A method for controlling the amount of polishing of a cutting blade, which is characterized in that the amount of polishing is controlled so as to approach an appropriate amount of polishing.

[0013]

According to the present invention, the measuring means measures the polishing amount of the cutting blade for each predetermined period. The control means compares the polishing amount measured by the measuring means with a predetermined appropriate polishing amount, reduces the polishing amount in the next polishing when the polishing amount is excessive, and increases the polishing amount in the next polishing amount when the polishing amount is insufficient. Let As a result, the measured polishing amount is fed back to the control for bringing the next polishing amount closer to the proper polishing amount, and the excess or deficiency of polishing is prevented. Since the polishing amount of the cutting blade becomes appropriate, the life of the cutting blade and the grindstone for polishing can be extended. In addition, it is possible to reduce unnecessary time for unnecessary polishing, stabilize the sharpness of the cutting blade, and reduce cutting trouble.

According to the invention, the measuring means measures the blade width of the cutting blade to measure the polishing amount. When the polishing is performed, the blade width is reduced according to the polishing amount. Therefore, the polishing amount can be easily measured by measuring the blade width.

Further, according to the invention, the control means decreases or increases the polishing time in one polishing to decrease or increase the polishing amount. The polishing amount is proportional to the polishing time if other conditions are constant. Therefore, if the polishing time is reduced or increased, control for reducing or increasing the polishing amount can be easily performed.

Furthermore, according to the present invention, the polishing amount of the cutting blade can be measured and compared with a predetermined appropriate polishing amount, and the polishing amount can be feedback-controlled. This makes it possible to prevent the polishing amount from becoming excessive or insufficient, extend the life of the cutting blade and the grindstone, reduce the dead time of polishing, and stabilize the sharpness of the cutting blade.

[0017]

1 is a simplified perspective view showing the basic structure of a cutting head 1 provided in a cutting device according to an embodiment of the present invention. A plurality of sheet materials 3 which are cloths such as clothes are stacked and placed on a flat support surface 5 constituted by a large number of bristle brushes 4. A cutting head 1 of a cutting device for cutting these sheet materials 3 into a predetermined shape.
Is basically a cutting blade 6, a head block 9 that causes the cutting blade 6 to reciprocally vibrate in the Z axis direction perpendicular to the support surface 5 by a cutting blade vibration motor, and the head block 9 is vertically displaced in the Z axis direction. A pneumatic cylinder 11 for moving, a moving means 13 for moving the pneumatic cylinder 11 in the Z-axis direction so that the cutting edge of the cutting blade 6 has a predetermined distance L1 from the surface 7 of the sheet material 3, and a peripheral portion of the cutting blade 6. Support surface 5
A foot presser 14 that is a pressing member that presses the sheet material 3 placed on the top, and a Z of the foot presser 14.
Position detecting means 16 for detecting a position in the axial direction, and the moving means 13 in response to the output from the position detecting means 16.
And a control means 17 for controlling.

A crank mechanism (not shown) is built in the head block 9, and the cutting blade 6 is reciprocally oscillated along the Z axis by the crank mechanism. R-axis means 15 for angularly displacing the cutting blade 6 about the Z-axis is also provided, and is configured to perform the cutting operation while directing the cutting edge in a preprogrammed cutting direction. The head block 9 is vertically displaced together with the cutting blade 6 by the pneumatic cylinder 11 along a pair of parallel guide shafts 49a and 49b. At a cutting start position or a position where the cutting direction is changed at a large angle, the piston rod 18 of the pneumatic cylinder 11 retracts and the cutting blade 6 pierces the sheet material 3. At the cutting end position, the piston rod 18 extends and the cutting blade 6 is pulled out from the sheet material 3. Thus, at the non-cutting position where the cutting blade 6 is removed from the sheet material 3, the tip 6a of the cutting blade 6 is cut.
Are set so as to have the predetermined interval L1. The pneumatic cylinder 11 is fixed to the sliding plate 10.
The lower limit when the head block 9 descends is defined by the stopper, and the cutting position of the cutting blade 6 is fixed.

The head block 9 has an output shaft 50 that reciprocally vibrates along the Z axis, and the cutting blade 6 is angularly displaced and detachably attached to the output shaft 50. The cutting blade 6 is inserted through the R-axis main body 15a and the operating ring 51, which are substantially right cylindrical. The operating ring 51 is the R-axis main body 1
The rotational force is transmitted from the motor 52, which is provided on the inner peripheral side of 5a, to the upper gear 51a via the timing belt 52a, so that the cutting blade 6 is rotated about the Z axis in the arrow A1 and A2 directions. The cutting edge is oriented in the cutting direction according to the cutting program. The R-axis body 15a is fixed to the sliding plate 10.

In the operating ring 51, pairs of polishing rollers 53a, 54a;
54b is provided. These are grinding stones for polishing, and are in non-contact with the cutting blade 6 at the time of cutting. By means of an internal gear 55, which is coaxially and rotatably provided on the operating ring 51, the polishing rollers 53a, 54a; 53b,
54b is rotationally driven. At the time of polishing, the internal gear 5
A cam ring 57, which is coaxially provided below 5, is restrained from the outside. At this time, either one of the pair of polishing rollers 53a, 54a or the other pair of polishing rollers 53b, 54b alternately alternates with the cutting blade 6 depending on the rotation direction of the operating ring 51.
It is displaced so as to contact the blade surface of. The cross-sectional shape of the cutting blade 6 perpendicular to the Z axis is substantially symmetrical with respect to a straight line passing through the cutting edge, and the blade surfaces on both sides intersect at the cutting edge at an acute angle.
By alternately polishing the blade surfaces on both sides, the blade width of the cutting blade 6 is reduced in accordance with the amount of wear of the blade surfaces on both sides. The internal gear 5
5 is rotationally driven by power from a motor 58 via a timing belt 59.

The moving means 13 has a screw rod 19 screwed into a nut member 10a fixed to the sliding plate 10, a pulley 20 fixed to the upper end of the screw rod 19, and a screw rod 19 for bidirectional A1. , A2 for rotational driving, a pulley 24 fixed to the output shaft 23 of the Z-axis lift motor 21, and a timing belt 25 wound around and stretched between the pulleys 20, 24. And a pair of limit switches 26a and 26b for detecting the upper limit position and the lower limit position of the nut member 10a.

The pneumatic cylinder 11 is extended to extend the cutting blade 6
Is pulled up to the non-cutting position set by the moving means 13, the polishing rollers 53a, 54a;
After b and 54b polish the blade edge, the blade width is measured. The operation pin 61 of the blade width detecting means 60 is moved forward to detect the detection pin 62.
It is also possible to detect the position of the cutting edge corresponding to the amount of wear of the cutting surface of the cutting blade 6 from the movement amount and the change in the pressing force after pressing. That is, the pressing force is detected when the detection pin 62 is advanced to come into contact with the blade edge, and the position of the blade edge is shown when the detection pin 62 is retracted and the pressing force disappears. When the cutting blade 6 wears, the position of the cutting edge changes to the forward side of the detection pin 62.

FIG. 2 shows the construction related to the blade width detecting means 60 and the detecting pin 62. An origin cam 56 is attached to the upper part of the operation ring 51 and is used for detecting the direction of the cutting edge of the cutting blade 6, that is, the reference direction around the R axis 8. The blade width can be measured when the cutting edge is oriented in a certain direction. A control unit 2 is provided to measure the blade width and feedback-control the polishing amount.

The cutting head 1 has a measuring position where the cutting blade 6 is pulled out from the sheet material 3 (state shown in FIG. 2).
Measuring position detecting means 3 such as a proximity switch for detecting
0 and the like are provided. Based on the output from the measurement position detecting means 30, the detection pin 62 is moved forward from the retracted position retracted from the blade edge 66 of the cutting blade 6 in a direction closer to the blade edge 66 and brought into contact therewith, and then separated from the blade edge 66. The control means 2 also performs a calculation for retracting the detection pin 62 in the direction of movement to the retracted position and calculating the distance from the retracted position to the blade edge 66 when the detection pin 62 advances. Measuring position detecting means 30
Is attached to the R-axis main body 15a and moves up and down as the sliding plate 10 moves up and down.

The cutting blade 6 is inserted through the operating ring 51 so as to be vertically displaceable, and the operating ring 51 is rotated around the R-axis 8 by the cutting blade turning drive motor 52 so that the cutting edge is oriented in a predetermined cutting direction. Is driven to rotate. A gear portion 51a of the actuation ring 51 is provided below the turning drive motor 52 to allow the rotation thereof. A pulley 58a is fixed to the output shaft of the polishing drive motor 58,
A timing belt 59 is wound around and stretched from the pulley 58a to the internal gear 55. Internal gear 55
A planetary gear 65 meshes with the rotary gear 65, and a rotating force via a shaft 75a coaxially fixed to the planetary gear 65 forms a pair of upper and lower polishing rollers 53 on both sides sandwiching the cutting blade 6.
It is transmitted to a and 54a and driven to rotate. These polishing rollers are alternately brought into contact with the cutting blade 6 to polish the blade edge 66.

As shown in FIG. 1, the Z-axis lift motor 21 is attached to the frame 12, and for example, a stepping motor is used. The lead of the screw rod 19 is selected to be about 3 mm / rev. Further, the limit switches 26a and 26b are vertically spaced from each other by a distance L2 = 50 mm.
When the pulse rate of the Z-axis lift motor 21 is 1000 pulses / sec, the sliding plate 10 can be driven to move up and down at 40 mm / sec. When the switching mode of either one of the limit switches 26a and 26b changes, the control means 17 outputs a stop signal to stop the Z-axis lift motor 21. The sliding plate 10 is slidable in the Z-axis direction along a guide groove (not shown) formed in the frame 12 of the cutting head 1.

The foot presser 14 is fixed to the lower ends of the guide shafts 14a and 14b provided on the operating ring 51.
Springs are provided at the upper ends of the guide shafts 14a and 14b to urge the foot presser 14 in the direction away from the surface 7 of the sheet material 3 on the Z axis. Pneumatic cylinder 27 fixed to sliding plate 10, and piston rod 28 of pneumatic cylinder 27
The mounting piece 29 fixed to the tip of the mounting piece 29 and the roller 29a pivotally supported by the lower end of the mounting piece 29 press the foot presser 14 toward the front surface 7 side on the Z axis. Pneumatic cylinder 2
The stroke L3 of the piston rod 28 of No. 7 is, for example, 20
Selected to be ~ 30 mm.

In order to detect the laminated thickness of the sheet material 3,
A foot presser 14 can be used. From the state where the pneumatic cylinder 27 is extended, the Z-axis lift motor 21
The sliding plate 10 is lowered by. When the foot presser 14 comes into contact with the surface 7 of the sheet material 3 while descending, the Z
The shaft lift motor 21 is stopped. The contact state of the foot presser 14 is detected by the position detecting means 16.

The position detecting means 16 has a rack 33 that rises upward from a mounting piece 29 on which a roller 29a that abuts the foot presser 14 is axially supported, a pinion 34 that meshes with the rack 33, and a rotation amount of the pinion 34. And a rotary encoder 35 for detecting. The rotary encoder 35 is fixed to the R-axis main body 15a. When the change in the count value of the rotary encoder 35 reaches an arbitrary set value L4, the Z-axis lift motor 21 is stopped.

FIG. 3 shows the operation of feedback control by the control means 2 of FIG. The operation is started from step a1, and the operation condition is set in step a2. As the operation conditions, the frequency of polishing for cutting, the timing of measuring the polishing amount, the proper polishing amount for one polishing operation of the cutting blade, and the like are set. The frequency of measurement and the appropriate amount of polishing are set as default values in advance, and default values are automatically given if no input is made. Alternatively, the material of the sheet material to be cut, the knife, and the type of the grindstone of the polishing roller may be input as data, and an appropriate default value may be selected according to the combination. The frequency of polishing is set, for example, for each cutting operation for a certain time or a certain distance. As the measurement timing, for example, a certain number of polishing operations is set as a measurement cycle, and the conditions under which the measurement should be performed are set.

At step a3, the sheet material is cut. In step a4, the polishing operation is performed according to the set conditions. The polishing operation is performed, for example, when the cutting blade 6 is pulled out from the sheet material 3 and the angle of the cutting blade 6 is greatly changed after the frequency condition is satisfied, or when the cutting head 1 is moved to another cutting pattern. This is performed during the transition, or at the end of cutting or during the advance standby for conveying the sheet material 3. In step a5, it is determined whether or not the cumulative number of polishing operations has reached the set measurement cycle. For example, when the measurement cycle set to about 100 times has not been reached, the operations of steps a3 and a4 are repeated. In step a5,
When you judge that you have reached the measurement cycle,
The polishing amount is measured at step a6 at the set timing. When the measurement is performed during the cutting operation, extra time is required and the cutting is delayed. Therefore, the measurement is performed when the cutting of the sheet material for one mark is completed or when the cutting blade 6 is stopped, such as during the advance standby. To do. Even if the next polishing is performed during this period,
The change in the polishing amount due to this can be ignored. In step a7, the measured polishing amount is compared with an appropriate polishing amount. As a result, in step a8, it is determined whether the polishing is excessive. When the polishing is not excessive, it is determined in step a9 whether the polishing is insufficient. When it is determined that the polishing is insufficient, the life of the grindstone is compared from the polishing time per time in step a10. Step a1
In the case of No. 1, the polishing time per time is, for example, as shown in FIG.
(A) reached the whetstone life equivalent to t3 hours,
Even if the polishing time is increased, it is determined whether the rate of increase in the polishing amount is small. When the life of the grindstone is not reached, in step a12, the polishing time per operation is increased so that the polishing amount approaches the proper amount. When it is determined in step a8 that the polishing is excessive, step a13
Then, the polishing time per operation is reduced so that the polishing amount approaches the appropriate amount. When step a12 and step a13 are completed, the process returns to step a3 and thereafter, and feedback control for adjusting the polishing amount is performed. Step a
When it is determined in 11 that the whetstone has reached the end of its life, an alarm is generated in step a14 to prompt the operator to replace the whetstone. The polishing time is increased or decreased, for example, every fixed time. 1
Even if the polishing amount does not become appropriate by the feedback control once, if it is repeated, it approaches the appropriate amount. Further, the characteristics of the grindstone as shown in FIG. 13 may be stored as data, and the increase / decrease time may be determined based on this.

FIG. 4 is a cross-sectional view showing a specific construction for measuring the blade width. The blade width detecting means 60 of the present embodiment is provided on the operation ring 51, and is provided with the detection pin 62.
It comprises a block 101 and a second block 102 provided on the R-axis main body 15a side radially outward of the R-axis 8 with respect to the first block 101. First block 101
Has a spring accommodating hole 103 having a right cylindrical inner peripheral surface and is fixed to the operating ring 51 by a holding member 104.
And a first compression coil spring 105 accommodated in the spring accommodating hole 103 while being attached to the detection pin 62. The detection pin 62 has a right-columnar small-diameter portion 106.
And a large diameter portion 107 having a right cylindrical shape integrally formed at one end of the small diameter portion 106, and a locking ring 108 is mounted near the end portion of the small diameter portion 106 facing the cutting blade 6. The detection pin 62 is moved by the spring force of the first compression coil spring 105.
Is prevented from coming off the spring accommodating hole 103.

When the detection pin 62 is retained by the locking ring 108, the tip 106a of the small diameter portion 106 of the detection pin 62 facing the cutting blade 6 and the small diameter portion 106 of the large diameter portion 107. The end portion 107 a on the opposite side of the holding member 104 projects from the holding member 104 to both sides. The first block 101 has the R-axis 8 of the operating ring 51.
It rotates by rotating around.

The second block 102 includes a casing 110 fixed to the R-axis main body 15a and a casing 1
The pressing member 111 housed in the casing 10 and the casing 11
It has a linear stepping motor 63 which is fixed to 0 and drives the pressing member 111 toward and away from the R-axis 8 to move toward and away from it, and a proximity switch 112 which detects the displacement of the pressing member 111. The pressing member 111 includes a cylinder 113,
A piston 11 that is displaceably housed in a cylinder 113
4 and. The cylinder 113 includes a small-diameter cylindrical portion 115,
The large-diameter cylindrical portion 116 is integrally connected to one end of the small-diameter cylindrical portion 115 in the axial direction. A piston chamber 117 into which the piston 114 is fitted is formed in the large-diameter cylindrical portion 116,
Further, the small diameter cylindrical portion 115 is formed with a spring accommodating hole 119 into which the piston rod 118 coaxially extending from the piston 114 is inserted. A second compression coil spring 120 is mounted on the piston rod 118 in the spring housing hole 119.
20, the piston 114 is elastically biased radially outward with respect to the R-axis 8, that is, to the left in FIG. Second
The spring constant of the compression coil spring 120 is set to be larger than the spring constant of the first compression coil spring.

The casing 110 includes a cylinder 11
An insertion hole 121 through which the small-diameter cylindrical portion 115 of No. 3 is inserted is formed, and the output shaft 122 of the linear stepping motor 63 is formed.
Can project to the outside of the casing 110 when it extends to the right in FIG. Further, when the output shaft 122 is retracted to the left in FIG. 3, the shaft portion 12 of the small-diameter cylindrical portion 115 is provided.
The actuating pin 61, which is the tip of No. 3, and the end 107a of the large-diameter portion 107 of the detection pin 62, are separated by a distance D1. Further, the small diameter portion 106 and the end portion 10 of the detection pin 62 are
6a and the cutting edge 66 of the cutting blade 6 are separated by a distance D2. Further, the end surface 124 of the large-diameter cylindrical portion 116 of the cylinder 113 and the end surface 125 of the piston 114 facing the end surface 124 are spaced apart by a distance D3, and further the end surface 126 of the small-diameter cylindrical portion 115 and the end surface 126 thereof are opposed to each other. The end surface 127 of the piston rod 118 is separated by a distance D4. The distance D1 is selected to be, for example, 1.5 mm, the distance D2 is selected to be 7.5 mm, the distance D3 is selected to 1.0 mm, and the distance D4 is set to 1.
Selected as 0 mm.

The large-diameter cylindrical portion 116 of the cylinder 113 has guide elongated holes 128a, 128b extending in the axial direction thereof.
And guide pins 129a and 129 fixed to the piston 114 are formed in the respective guide slots 128a and 128b.
b is movably inserted.

The linear stepping motor 63 has a step size of 0.029 mm / pulse and a lead pitch of 0.7 mm / revolution. For example, the output shaft 12 is moved at a moving speed of 12 mm / sec at 420 pulses / sec.
2 can be driven to extend / retract.

In the large-diameter cylindrical portion 116 of the cylinder 113, the tip portion 106a of the detection pin 62 has the cutting edge 6 of the cutting blade 6.
6 is provided with a contact position detection switch 130 for detecting contact with 6, and the proximity switch 112 is in the OFF state, that is, the output shaft 122 of the linear stepping motor 63 extends and the pressing member 111 causes the casing 110 to move.
When the contact position detection switch 130 is turned on in the state where the contact position detection switch 130 is moved to the right in FIG.
The blade width can be measured as described above by determining that 6a has come into contact with the blade edge 66. The polishing amount of the cutting blade 6 can be obtained from the difference in blade width before and after polishing.

FIG. 5 shows the principle of measuring the blade width by the structure shown in FIG. W1 has a distance D1 and D3 of 0
It is equal to the distance D2 when. When the blade width of the cutting blade 6 is W2, the distance W3 from the tip portion 106a of the detection instrument 62 to the ridge 68 of the cutting blade 6 is constant due to the mechanical arrangement relationship between the blade width detection means 60 and the cutting blade 6. is there. It is the distance W1 that is directly detected, and the blade width W2 is W2 = W3-W
It is calculated by the operation of 1. The blade width can be optically measured in a non-contact state using a laser beam or the like. The polishing amount can also be measured from the amount of change in the distance W1, that is, the change in the position of the cutting edge. The position of the blade edge can be detected not only by direct mechanical contact but also by contact or non-contact optically or electrically.

6 to 8 show the construction related to the polishing of the cutting blade 6. FIG. 6 is a partial sectional view. 7 and 8 are sectional views taken along the section line VII-VII in FIG. 6, respectively.

The driving force from the motor 58 is the pulley 58a.
And is transmitted to the outer peripheral side of the internal gear 55 through the timing belt 59. The rotation of the planetary gear 65 meshing with the inner peripheral side of the internal gear 55 is controlled by the polishing rollers 53a, 53b;
It is the rotation transmission means 67 that transmits to 4a and 54b.
It is the locking means 69 that locks the rotation of the operating ring 51 and releases the locked state.

The operating ring 51 is rotatably supported by the R shaft main body 15a fixed to the sliding plate 10 via a pair of upper and lower bearings 71 and 72. An origin cam 56 is attached above the operation ring 51. An origin detector 73 is provided near the peripheral edge of the origin cam 56. Origin cam 5
When the protruding portion 6 is located at the position of the origin detector 73, the orientation of the cutting edge of the cutting blade 6 is used as a reference.

In the rotation transmission means 67, the planetary gear 65 is fixed to the shaft 75a. In the vicinity of the shaft 75a, the shaft 75
Another axis 75b is arranged parallel to a and each axis 75
Gears 76a and 76b meshing with each other are fixed to a and 75b, respectively, and the rotational force of the planetary gear 65 is transmitted to the other gear 76b via one gear 76a and the gear 76b is fixed. It is transmitted to the shaft 75b. A pair of pulleys 77a and 78a is fixed to the one shaft 75a with a space in the axial direction. The same applies to the other shaft 75b. Between the pair of pulleys, one ends of swing members 79a and 79b are swingably mounted. The shafts 80a and 80b are attached to the other ends of the swinging members 79a and 79b.
And the polishing rollers 53a, 54a; 53b, 54b are rotatably mounted on both ends of the shafts 80a, 80b.

A mounting piece 81 is fixed to the R-axis main body 15a, and the mounting means 81 is provided with the locking means 69.
The locking means 69 has a pneumatic cylinder 82 fixed to the mounting piece 81, and a contact piece 83 fixed to the tip of the piston rod of the pneumatic cylinder 82.
Can contact / separate from the outer peripheral surface of the toothed portion 57a of the cam ring 57 to lock / release the rotation of the cam ring 57.

As shown in FIG. 8, the cam ring 57 includes
A cam groove 84a that is convex outward in the radial direction from its inner peripheral surface,
84 b and two through holes 86 a and 86 b extending in the circumferential direction are formed on both sides of the contact portion 85. The cam groove 84a,
The followers 87a and 87b formed integrally with the swing members 79a and 79b are fitted in the 84b and guided along the cam surface. Both ends of the tension coil spring 88 are locked to the swinging members 79a and 79b, respectively, and the polishing rollers 53a and 54a; 53b and 54b are urged in directions toward each other. As a result, each follower 87a, 87
b is radially outward, that is, when the followers 87a, 87b face the cam grooves 84a, 84b, they are spring-biased in a direction to elastically contact the cam surfaces.

The cutting blade 6 is fitted and guided in a guide groove of a guide member 89 provided upright in the operating ring 51, and a mounting piece 90 is fixed to the guide member 89. Two swinging arms 91 a and 91 b are attached to the mounting piece 90 by a pin 92.
a and 92b are swingably connected, and the free ends 93a and 93b of the swing arms 91a and 91b have the through holes 86.
It fits in a and 86b. Each swing arm 91a, 91
b is each of the free end portions 93a, 9a due to the tension coil spring 94.
The springs 3b are biased toward each other. When the contact piece 83 is separated from the toothed portion 57a of the cam ring 57, the cam ring 57 and the operating ring 51 rotate integrally, and the followers 87a and 87b are provided with the cam grooves 84a and 84b.
Stay in the center of.

In this state, when compressed air is supplied to the pneumatic cylinder 82, the piston rod extends and the contact piece 8
3 abuts on the outer peripheral surface of the toothed portion 57a, which prevents the cam ring 57 from rotating. Motor 5 for R-axis drive
When 2 is rotationally driven, the actuation ring 51 slightly rotates in one direction C, one follower 87a is fitted into the cam groove 84a, and the free end portion 93b of the one swing arm 91b is also fitted.
Is abutted against the abutting portion 85, it is angularly displaced in the direction away from the other swing arm 91a against the spring force of the tension coil spring 94, and is expanded. In this state, the revolution movement of the planetary gear 65 is restricted, and the rotation of the internal gear 55 causes the planetary gear 65, the shafts 75a and 75b, and the gears 76 to rotate.
a and 76b are transmitted to the polishing rollers 53a and 54a; 53b and 54b via the pulleys and belts 95 and 95b, and are rotationally driven. These polishing rollers 53a,
The rotation speeds of 54a; 53b and 54b are 4500 to 800.
The cutting blade 6 is selected on the side of the polishing roller 54a and is selected to be about 0 rpm.
Polish the cutting edge of.

When the R-axis driving motor 52 starts to rotate in the opposite direction, the rotation is transmitted to the polishing rollers 53a, 54a; 53b, 54b as described above, and the operating ring 51 is moved. , The other follower 87b is rotated in the direction opposite to the rotation direction C, and the cam groove 84b
The other side surface of the cutting blade 6 is polished by the polishing roller 54b side. When polishing the cutting blade 6 as described above, the polishing rollers 53a, 54a;
The contact pressure of the cutting blades 3b and 54b against the cutting blade 6 can be adjusted by the spring force of the tension coil spring 88. Further, the polishing amount can be set by the depth d from the inner peripheral surface 96 of each cam groove 84a, 84b. In this way, the polishing rollers 53a, 54a; 53b, 54b are brought into contact with the cutting blade 6 in a state where the rotation of the cam ring 57 is stopped by the locking means 69 regardless of the rotational position of the cutting blade 6. Can be polished.

FIG. 9 is a flow chart for explaining the polishing operation of the cutting blade 6. First, in step s1, the polishing operation is started, and the cutting blade 6 that was being cut in step s2 is lifted and pulled out from the sheet material 3,
3 to activate the internal gear driving motor 58, 4500
Rotate at ~ 8000 rpm.

In step s4, the R-axis motor 52 is stopped and the locking means 69 is operated to bring the contact piece 83 into contact with the outer peripheral surface of the toothed portion 57a of the cam ring 57, which is a sliding ring. Lock the rotation of 57. by this,
In step s5, the operating ring 51, which is a rotating cylinder, is rotated by -15 ° in the direction of arrow C with respect to the cam ring 57, and the polishing rollers 53a and 54a are pressed against one side of the cutting blade 6 and set. Polishing time, for example, about 0.2 to 3 seconds.

Next, in step s6, the rotation direction of the R-axis motor 52 is switched to the opposite direction, and the operating ring 51 is moved to +30.
Rotated, and the other side of the cutting blade 6 is polished by the polishing rollers 53b and 54b. In step s7, the R-axis motor 5
2 is reversed and each polishing roller 53a, 54a; 53
b and 54b are returned to the initial position where they do not contact the cutting blade 6. Then, in step s8, the contact piece 83 is moved to the toothed portion 57a.
The internal gear driving motor 58 is stopped in step s9, and the polishing operation ends in step s10, and the next cutting operation starts.

In this way, when the cutting blade 6 is pulled out of the sheet material 3 and the cutting operation is interrupted, for example, to move to another cutting pattern, regardless of the direction of the cutting blade.
It can be polished uniformly and quickly.

FIG. 10 shows an electrical construction related to the control means 2 shown in FIG. The control means 2 includes a processing circuit 41,
The input device 42, the storage device 43, the memory 44, the counter 45, and the like are included. The processing circuit 41 is realized by including a microcomputer and the like. From the input device 42,
Commands and conditions for cutting and polishing are input. In the storage device 43, a storage medium such as a floppy disk,
Cutting data, default values for polishing and measurement,
Data such as the life of the grindstone is stored. The memory 44 stores various data such as the previous blade width measurement value. The counter 45 is used to count the number of polishing times. The X-axis motor 46 and the Y-axis motor 47 are respectively driven when the cutting head 1 is moved in the X direction and the Y direction shown in FIG.

FIG. 11 is a sectional view showing a structure for polishing according to another embodiment of the present invention. Cam ring 1 of this embodiment
57, two guide protrusions 184a and 184b that protrude radially inward from the inner peripheral surface thereof are formed at intervals in the circumferential direction, and these cam surfaces 197a and 197b are provided with respect to the cam ring 157. The rollers 187a and 187b are guided in accordance with the relative forward / reverse rotational movements of the operating ring. Each roller 187a, 187b has a shaft 75
arm 193a connected to a and 75b for angular displacement,
It is pivotally supported by each free end of 193b. These arms 19
3a, 193b each free end and each swing member 179a, 17
The compression coil springs 168a and 168b are respectively interposed between the coil 9b and 9b. Rollers 187a, 18 pushed inward in the radial direction by cam surfaces 197a, 197b
By the displacement of 7b, the rocking members 179a and 179b are pressed in the directions in which they approach each other. As a result, the polishing rollers 53a, 54a; 53b, 54b can be pressed against the cutting blade 6. In addition, the swing members 179a, 17
One end of each of the extension coil springs 188a and 188b is locked to 9b, and the other end of each of the extension coil springs 188a and 188b is locked to the actuation ring 51. By these tension coil springs 188a and 188b, each swinging member 1
79a, 179b and polishing rollers 53a, 54a; 5
3b and 54b can be urged in directions away from each other and returned after the polishing operation is completed.

In this embodiment, the polishing rollers 53a, 54
a; The pressing amount of 53b and 54b is set to the guide protrusion 184.
a, 184b height, compression coil springs 168a, 16
It can be easily adjusted by the strength of 8b. Further, the pressing amount can be adjusted according to the relative angular displacement amount of the actuation ring 51.

The control of the polishing amount is performed not only by adjusting the polishing time and the pressing amount but also by the internal gear driving motor 58.
It is also possible by adjusting the rotation speed of.

[0057]

As described above, according to the present invention, it is possible to perform feedback control so that the polishing amount of the cutting blade becomes an appropriate polishing amount. Therefore, it is possible to prevent excessive polishing. As a result, the life of the cutting blade and the grindstone for polishing can be extended. Further, since it is possible to prevent excessive polishing, it is possible to reduce the dead time of polishing required for unnecessary polishing. Further, a grindstone used for polishing, since the polishing performance gradually decreases as the integrated time of polishing becomes large, polishing becomes insufficient, and the sharpness of the cutting blade may deteriorate,
Since feedback control is performed to an appropriate polishing amount, insufficient polishing can be prevented. This stabilizes the sharpness of the cutting blade and reduces cutting troubles.
Further, since it is possible to grasp the deterioration of the polishing performance of the grindstone used for polishing, it is possible to clearly know the replacement time of the grindstone, the cleaning time for removing the clogging, and the like. Therefore, it is not necessary to replace the grindstone at regular intervals to remove the grindstone that is still usable or to replace the grindstone in an unstable state by relying on the operator's intuition as in the conventional case. In this way, the replacement time of the grindstone is clarified, and the number of inspections can be reduced.

Further, according to the present invention, since the blade width of the cutting blade is measured to measure the polishing amount, the polishing amount can be measured easily and quickly, and the polishing operation can be performed accurately without lowering the efficiency of the cutting operation. The quantity can be measured.

Further, according to the present invention, the polishing time in one polishing is reduced or increased to reduce or increase the polishing amount. Since the polishing time can be easily controlled, the polishing amount can be easily controlled.

Further, according to the present invention, since the feedback control is performed while measuring the polishing amount, stable polishing can be performed even if the performance of the polishing stone or the like changes, and excessive polishing or insufficient polishing can be prevented. You can

[Brief description of drawings]

FIG. 1 is a perspective view showing a simplified main part of a cutting machine equipped with a cutting blade polishing control device according to an embodiment of the present invention.

FIG. 2 is a simplified cross-sectional view showing a configuration for measuring the blade width of the embodiment of FIG.

FIG. 3 is a flowchart showing the operation of the embodiment of FIG.

FIG. 4 is a partial cross-sectional view showing a specific configuration for measuring the blade width of the embodiment of FIG.

FIG. 5 is a diagram for explaining a blade width calculation procedure in the embodiment of FIG. 1;

FIG. 6 is a cross-sectional view showing a configuration related to a polishing apparatus in the embodiment of FIG.

7 is an enlarged cross-sectional view taken along the section line VII-VII in FIG.

8 is an enlarged cross-sectional view taken along the section line VII-VII in FIG.

9 is a flow chart showing a polishing operation of the cutting blade 6 of the embodiment of FIG.

10 is a block diagram showing an electrical configuration of a control means 2 of the embodiment of FIG.

FIG. 11 is a sectional view of another embodiment of the present invention.

FIG. 12 is a graph showing the relationship between the number of times of polishing and the amount of polishing of a cutting blade polishing grindstone.

FIG. 13 is a graph showing the relationship of the polishing amount with respect to the polishing time of a general grindstone and a cutting blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting head 2 Control means 3 Sheet material 4 Cutting blade 8 R axis 9 Head block 15a R axis main body 30 Measuring position detection means 51 Actuation ring 52,58 Motor 53a, 54a; 53b, 54b Polishing roller 55 Internal gear 57,157 Cam ring 60 Blade width detection means 61 Actuation pin 62 Detection pin 63 Linear stepping motor 65 Planetary gear 66 Blade edge 67 Rotation transmission means 68 Ridge 69 Locking means 71, 72 Bearing 79a, 79b; 179a, 179b Swing member 82 Pneumatic cylinder 83 Contact Piece 84a, 84b Cam groove 87a, 87b Follower 88; 188a, 188b Tensile coil spring 89 Guide member 112 Proximity switch 130 Contact position detection switch 184a, 184b Guide protrusion 187a, 187b Roller 193a, 193b Ar

Claims (4)

[Claims] 1. A cutting blade polishing amount control device which is repeatedly polished according to a predetermined condition while the cutting machine is operating, and a measuring means for measuring the polishing amount of the cutting blade every predetermined period, In response to the output from the measuring means, the measured polishing amount is compared with a predetermined proper polishing amount, the polishing amount in the next polishing is reduced when the polishing amount is excessive, and the polishing amount in the next polishing is insufficient when the polishing amount is insufficient. And a control means for increasing the amount to bring the polishing amount in the next polishing closer to the proper polishing amount. 2. The polishing amount control device for a cutting blade according to claim 1, wherein the measuring means measures the blade width of the cutting blade to measure the polishing amount. 3. The cutting amount control of the cutting blade according to claim 1, wherein the control means decreases or increases the polishing amount by decreasing or increasing the polishing time in one polishing. apparatus. 4. A method for controlling a polishing amount of a cutting blade, which is repeatedly polished according to a predetermined condition while a cutting machine is in operation, wherein the polishing amount of the cutting blade is measured and measured every predetermined period. Compare the amount of polishing to a predetermined appropriate amount of polishing, reduce the amount of polishing in the next polishing when excessive polishing,
When the amount of polishing is insufficient, the amount of polishing in the next polishing is increased, and the amount of polishing in the next polishing is controlled so as to approach the appropriate amount of polishing.