JPH11254228A - Cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the overall length of a long material to be cut at the present time with a measuring device fixed at a given place. SOLUTION: In a cutting machine wherein a long bar 1 is intermittently fed in a longitudinal direction and cut predetermined length L during the stoppage of feed, a measuring device 5 is arranged at a position separated a given distance C on the supply source side of the long bar 1 with regard to a cutting position to measure the travel of the long bar 1, and a control section 6 is provided to issue a command to continue or discontinue the current cutting using the travel as a criterion. When an intermediate part of the long bar 1 passes the measuring point until a long bar which is temporarily stopping stops the next time, the control section 6 issues a command to continue the current cutting, and when the rear end of the long bar 1 passes the measuring point, the control section 6 calculate the overall length of the long bar 1 at the present time based on the travel of the long bar 1 and calculate the number of times of cutting based on the calculated overall length of the long bar 1 and issues a command to continue or discontinue the current cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for automatically cutting a long material at a set size. More specifically, the present invention relates to a unit having a desired set size from a long material whose entire length is not measured. And a cutting machine which can obtain as many as possible.

[0002]

2. Description of the Related Art In order to obtain a unit having a desired length by cutting a long material, it is necessary to securely hold the long material during cutting. By the way, when the long material is repeatedly cut, the length gradually decreases, and finally a short rear end material is generated.
When the unit adjacent to the rear end material is cut when the length of the rear end material is less than the length required for holding at the time of cutting, the adjacent unit becomes a defective product deviating from a desired length for the above-described reason, and other Calculate the length of the rear end material before cutting the adjacent unit because it is mixed in a good product, and then interrupt the cutting with the adjacent unit and the rear end material integrated or cut the adjacent unit There is a need for a mechanism for automatically controlling whether to do so. For this reason, conventionally, a point behind the cut point, specifically, a point separated by an integral multiple of the set length to be cut + β (the length necessary to hold the long material at the time of cutting). In addition, if there is a detecting means for checking the presence or absence of a long material, and if the detecting means determines that there is a long material at the point, the cutting is continuously performed as it is, and it is determined that there is no long material. , The cutting was interrupted after cutting several times, and the next long material was charged. However, this method has a trouble that the position of the detecting means must be automatically or manually moved every time the set length to be cut is changed.

Therefore, a technique (Japanese Patent Laid-Open No. 58-177228) for solving the above-mentioned inconvenience has been developed. This is because, at a certain position behind the cut point, a large number of light emitting and receiving devices are arranged at equal intervals along the longitudinal direction of the long material, and the set length for cutting the installation width of the light emitting and receiving devices. Is set to a width slightly longer than the maximum value, and by detecting the rear end of the long material by the light emitting and receiving device, the total length of the long material to be cut from now is measured, and based on that, the length of the rear material is determined. The total length is calculated, and the total length is compared with β (the length required for holding) to determine the remaining number of cuts. However, in this technology, unless the distance between adjacent emitters and receivers is narrowed, the measurement accuracy of long materials will not improve, but there is a limit to narrowing the distance, so it is impossible to achieve an accurate total length It was impossible. For this reason, even if the rear end material is actually β or more, it may be calculated as less than β in the measured value, in this case, without cutting the unit adjacent to the rear end material, as it is As a result, adjacent units are wasted.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to accurately measure the present total length of a long material to be cut from now on. Moreover, it is an object of the present invention to provide a cutting machine which can be used with the measuring instrument fixed at one place.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a cutting machine for intermittently feeding a rod-shaped long material along its longitudinal direction and cutting the long material to a set length while feeding is stopped. At a certain distance from the long material supply side,
A measuring device for measuring the amount of movement of the long material passing through the point is arranged, and a control unit is provided for instructing continuation and interruption of cutting using the amount of movement as a judgment material, and the control unit controls the temporarily stopped long material. Until the next stop of the material, if the middle portion of the long material passes through the point, a command to continue cutting is issued, and if the rear end of the long material passes through the point, Calculating the total length of the long material at the present time based on the amount of movement measured in the above, calculating the number of cuts that can be made from the total length, and instructing continuation and interruption of the cutting based on the number of times. .

[0006] It is necessary to set the measuring device at a position at least distant from the cutting position for at least the maximum value of the set dimension for cutting the long material + the minimum length necessary for holding at the time of cutting. is there. The minimum length required for holding during cutting is not less than the diameter of the long material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a cutting machine according to the present invention has a fixed size which is moved back and forth on the basis of a set dimension L for abutting against a distal end surface of a long material 1 and cutting the long material 1. A stopper 2, a cylindrical lower blade 3 that is disposed in a state facing the rear of the fixed-size stopper 2 and that inserts and restrains the long material 1 therein;
A flat upper blade 4 that moves up and down along the distal end surface of the cylindrical lower blade 3, a measuring device 5 disposed at a point behind the cut point, and a raising and lowering and setting of the flat upper blade 4 based on information obtained from the measuring device 5. And a controller 6 for moving the dimension stopper 2 forward and backward. Note that the set dimension L is input to the control unit 6.

The measuring device 5 is provided at the rear of the cut location, more specifically, at an integral multiple of the maximum value of the set dimension L for cutting the long material from the cut location + the minimum length required for holding at the time of cutting. It is arranged in a state facing the long object 1 on the side of the point which is separated only by a distance. The operation principle of the measuring device 5 will be described below.
When the surface of the measurement object, that is, the long object 1 is irradiated with laser light, a speckle pattern is generated. This speckle pattern has a light and dark mottle pattern, which is received by a one-dimensional image sensor. When the measurement object moves, the speckle pattern also moves in the same direction.
This movement amount is calculated in the analysis circuit of the amplifier unit.

The cutting machine feeds the long material 1 along its longitudinal direction, stops the feeding after the leading end surface of the long material 1 comes into contact with the fixed-size stopper 2, and stops the feeding of the long material 1. Cutting is performed while the unit is stopped, and the cut unit is dropped as it is and collected as a non-defective product. The long material 1 is fed again until it comes into contact with the fixed size stopper 2, and the cutting operation is repeated. In addition, the cutting machine interrupts the cutting and puts in the next long material 1 when the total length of the long material 1 is shortened by repeating the cutting, and the length of the long material 1 cannot be obtained. Then, the remaining material remaining in the cylindrical lower blade 3 is extruded with the next long material 1, the remaining material is collected as a defective product, and cutting is restarted. The total length of this residual material is the set dimension L
In the above case, before extruding the residual material, the fixed-size stopper 2 is retracted in advance, the interval is widened so that the residual material can be dropped, and then the residual material is extruded with the next long material 1, and subsequently, It is necessary to advance the fixed size stopper 2 to a position of a desired cutting dimension L. By the way, the total length of the long material 1 before cutting is divided by the set dimension L, and the surplus length α is defined as the length of the rear end material 7.
If the length α is equal to or longer than the length required for holding when cutting, the unit 8 adjacent to the rear end member 7 is cut, and the rear end member 7 becomes the above-mentioned residual material. If α is smaller than that, the cutting is stopped in a state where the rear end member 7 and the adjacent unit 8 are integrated, and the remaining end member 7 and the adjacent unit 8 are integrated. In the drawing, the long material 1
, A device for raising and lowering the flat upper blade 4, and a device for moving the fixed-size stopper 2 are omitted.

The control unit 6 derives the length α of the rear end material 7 by the following calculation method. The distance between the cut point and the measuring instrument 5 is C. If the intermediate portion of the long material 1 passes through the point of the measuring device 5 until the temporarily stopped long material 1 stops next, the moving amount of the long material 1 is the set dimension L. Is transmitted from the measuring device 5 to the control unit 6, in this case, the control unit 6
Does not calculate the value of α, and the control unit 6 issues a command to continue cutting. And, as shown in FIG.
From the state immediately before the rear end of the long material 1 passes through the point of the measuring instrument 5, the long material 1 is cut to the set dimension L, and then the long material 1 is cut.
Is carried out, the rear end of the long material 1 passes as shown in FIG. In this case, the control unit 6 performs a calculation for deriving the value of α for the first time. In this case, since the long material 1 passing through the point of the measuring device 5 during the feeding operation of the long material 1 disappears, the measuring device 5 measures the movement amount A of the long material 1 (the measuring device 5 and the moving amount 5). The distance to the rear end of the long material 1 (see FIG. 1) is transmitted to the control unit 6, and the control unit 6 adds the distance C between the cut point and the measuring instrument 5 to the movement amount A, and cuts the long material Calculate the current total length of No. 1. This total length is divided by the set dimension L, and the remainder becomes the length α of the rear end member 7. In terms of a calculation formula, (C + A) / L = n (integer remainder α). Also, when the movement amount A is 0, the control unit 6 performs calculation for deriving the value of α.

In the above-mentioned cutting machine, when the rear end of the long material 1 passes through the point of the measuring device 5, the current total length of the long material 1 can be accurately grasped. As a result, the comparison between the total length of the remaining material and the set dimension L becomes accurate, and as a result, it is necessary to move the fixed-size stopper 2 forward and backward in order to push the remaining material from the cylindrical lower blade 3. The work efficiency of the cutting machine is improved because it is not necessary to move the fixed-size stopper 2 when unnecessary.

[0012]

According to the cutting machine of the present invention, even if the set dimensions to be cut are changed, the measuring instrument can be used in the same position without moving the measuring device from the installation position, and the measurement can be performed. Since the moving amount of the long material can be accurately known by the container, the current total length of the long material to be cut from now can be accurately grasped based on the moving amount. Become accurate,
As a result, long materials can be used effectively without waste,
The yield is improved.

[Brief description of the drawings]

FIG. 1 is a view showing a cutting machine of the present invention in a state immediately before a rear end of a long material passes a point of a measuring instrument.

FIG. 2 is a view showing a state immediately after a rear end of a long material has passed a point of a measuring instrument.

[Explanation of symbols]

 1 Long material 5 Measuring device 6 Control unit L Setting dimension C Constant distance

Claims (1)

[Claims] 1. A cutting machine for intermittently feeding a rod-shaped long material (1) along its longitudinal direction and cutting the long material (1) to a set dimension (L) while feeding is stopped. A measuring device (5) for measuring the amount of movement of the long material (1) passing through the point at a point away from the supply source side of the long material (1) by a certain distance (C), A control unit (6) for instructing the continuation and interruption of the cutting using the movement amount as a judgment material is provided. The control unit (6) controls the elongation of the long material (1) which has been temporarily stopped until the next stop. When the middle part of the long member (1) passes through the measurement point, a command to continue cutting is issued, and when the rear end of the long member (1) passes through the point, measurement is performed during that time. Based on the movement amount, the total length of the long material (1) at the present time is calculated, the number of cuts that can be performed is calculated from the total length, and continuation of cutting is performed based on the number of times. Cutting machine, characterized in that the cross-sectional command.