JP2807661B2 - Switching sheet cutting dimensions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting size switching method for switching a cutting size of a cutter to a defective portion cutting size when a defective portion occurs in a process of continuously producing sheets such as a corrugator machine. About.

[0002]

2. Description of the Related Art Sheets such as double-sided corrugated cardboard, in which front liner paper is laminated to single-sided cardboard, or two single-sided corrugated paperboards are laminated and laminated, and another double-sided corrugated cardboard, in which another sheet of front liner paper is laminated. In the corrugator machine to be formed, the formed sheet is cut into a product cutting length set by a customer's order by a rotary cutter installed at a predetermined position downstream of the sheet laminating step, and is sent to a subsequent step. The traveling length of the paper from the base paper supply section at the upstream end of the corrugator machine to the rotary cutter is about 20.
It is as long as 0 m.

[0003] The rotary cutter has a predetermined cutting dimension,
Drive control is performed such that a predetermined operation is performed by a signal based on the circumference of the rotary cutter, the running speed of the sheet, the rotation speed of the rotary cutter, and the like, and the sheet is cut to a predetermined size. Such a control device for a rotary cutter is disclosed in, for example, Japanese Patent Publication No. 56-41398.

When a sheet is cut into a predetermined size and continuously produced by controlling the rotary cutter by the control device as described above, each base paper is consumed in a mill roll stand on the base paper supply side, and one roll base paper is used. Splicing to another rolled base paper just before it disappears and supplying the same base paper continuously, or switching to production of a different type of corrugated cardboard, that is, performing splicing to different base paper by changing lots and Become.

[0005] Therefore, in the corrugator machine, from the supply of base paper to the production process of single-faced corrugated cardboard using a single facer,
In general, production control is applied to the timing and speed of sheets to be produced and the conditions for feeding the base paper to be supplied, with regard to the automatic control of all processes from the heating process, the gluing process, and the lamination process using the double facer to the rotary cutter. It is always managed by the device.

[0006]

As described above, the corrugator machine is a long facility including various processes from the supply of the base paper to the rotary cutter. Since the sheet is cut into a corrugated cardboard sheet, a defective portion may occur due to various causes in the middle of the processing path.

[0007] The main causes of the occurrence of such defective portions are the incorporation of splicing during the production of rolled base paper, splices (splices) in a mill roll stand, and discontinuities in slits and ruled lines due to lot change in a slitter scorer. There is a step formation failure in a single facer, an adhesive displacement due to a restart of the drive after the operation of the double facer is stopped, and the like. Then, when such a defective portion occurs, a signal of detecting the defective portion by a detector is input so that the defective portion is not mixed into the non-defective sheet, or an external signal is manually input by an operator and manually detected. And is automatically removed by a diverter (defective removal device).

The cutting length of the sheet with the rotary cutter is as follows:
For example, it is determined within the range of about 600 to 3000 mm depending on the order of the customer, and the predetermined cutting dimension is the same without being changed even in the defective portion within the same lot. Therefore, the cut size of the sheet of the defective portion removed by the diverter every time the lot is changed varies. Therefore, when the defective sheets removed by the diverter are manually stacked or moved, the work is cumbersome and troublesome, and even after stacking, the load easily collapses. Further, since the sheet length of the defective portion is irregular, a long sheet may be stuck in the diverter or the corrugator machine may have to be stopped in an extreme case. In addition, a long conveyor is required to hold the maximum length defective sheet.

An object of the present invention is to provide a sheet cutting dimension switching method capable of solving a problem when a defective portion of a sheet occurs by a simple method.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, there is provided a process for continuously manufacturing sheets and cutting the manufactured sheets to a predetermined cutting length for each lot by a cutter. Each time a cutting signal is generated after a sheet defect is detected by a defect detection sensor provided at a position more than the product cutting length from the cutter, the sum of the next and subsequent product cutting lengths and the remaining length of the defective part to the cutter each time a cutting signal is generated Is repeated, and when the remaining length becomes smaller than the sum, the sheet cutting dimension switching method is designed to switch the cutting length one after another to the defective part cutting dimension.

In the present invention having the above-described method, the sheet is cut so that the cut length of the defective portion is constant even if the production lot of the sheet is different. This defective portion is generated during the production process due to the various causes described above, and such a defective portion is detected by the detector. The detector is located at least upstream of the product cutting length from the cutter for cutting the sheet. The cutter is provided at an arbitrary predetermined distance away, so cutting is continued at a predetermined product cutting length as a non-defective sheet until the detected defective portion approaches the cutter, and if the defective portion arrives immediately before the cutter, the cutter is defective. The mode is switched to the partial cutting mode, and cutting is performed at the defective partial cutting dimension. This switching is performed when the sum of the next and subsequent product cutting lengths based on the cutting signal and the remaining length up to the cutter of the defective portion are smaller than the sum as a result of comparison. The defective fixed-size sheet including the defective portion thus cut is discharged from the cutter and then removed from the transport line.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration before and after including a cut-off mechanism as a rotary cutter of a corrugator machine and an outline of a control circuit, and FIG. 2 is a flowchart showing switching to a defective part cutting dimension. 1 is a part (cooling part) of the rear part of the double facer, 2 is a slitter / scorer, 3 is a rotary cutter, and 4 is a diverter.

In the corrugator machine, the base paper supplied from the mill roll stand is laminated with a single facer to form a single-sided corrugated cardboard, and the front liner is laminated with a double facer to produce a double-sided corrugated cardboard. It is a well-known one, and the process part upstream of the double facer is not shown, and only the necessary part behind the double facer is schematically shown.

A continuous corrugated cardboard sheet W traveling downstream through the double facer 1 is slit or scored by the slitter / scorer 2 and cut by the rotary cutter 3 to a predetermined product cutting length and sent out. The cut sheets are stacked on a stacker (not shown) provided downstream and discharged.

If a defective portion is detected, the cut size of the rotary cutter is switched to the defective portion cut size based on the sheet cut size switching method of the present invention described later, and the defective portion is cut at this cut size. Thereafter, the diverter 4 removes the non-defective sheet so as not to be mixed.

The production process of the corrugated cardboard sheet described above is controlled by the production management device 10 to continuously produce corrugated cardboard sheets. The production control device 10 is provided with an inlet of the storage mechanism to detect a base paper supply signal from the upstream mill roll stand, and how much single-sided cardboard sheets produced by the single facer are stored in the storage mechanism on the way. The travel distance measurement sensors S ₁ and S ₂ provided at the exits respectively
The output length of the corrugated cardboard sheet and the consumption length of the base paper are managed by the output signal of the rotary cutter 3 or the cutting signal detected by the cutting detection sensor 23 provided for the rotary cutter 3 every time the sheet is cut. Indicate the cutting length at

The sheet cutting dimension switching circuit 20 is a circuit provided to carry out the sheet cutting dimension switching method of the present invention. As shown in the drawing, a defect detecting sensor 21, a traveling distance measuring sensor 22, and a cutting detecting sensor 23 are provided. Are connected respectively. Further, this circuit includes a counter for presetting a running length (equipment length) of the sheet from the rotary cutter 3 to the fault detection sensor 21 and obtaining a remaining length of the faulty portion which travels and moves to the rotary cutter 3; Whether the cutting signal from the rotary cutter was received, or the remaining length was less than the predetermined length, and cutting was still in progress with the defective part cutting dimensions (hereinafter referred to as defective fixed length cutting), or the remaining length was less than the defective part cutting dimensions And a comparing / determining unit (not shown) for determining whether or not the condition has been reached.

The defect detecting sensor 21 is provided at an appropriate position behind the double facer 1 for detecting a defect on the sheet surface. In addition, the defect detecting sensor 21 is provided with a double facer for detecting various defects inside the sheet. It may be provided at an appropriate position on the upstream side. The travel distance measuring sensor 22 is generally provided immediately before the rotary cutter 3 in order to determine a cutting timing at the rotary cutter 3. The cutting detection sensor 23 is a sensor that detects a blade that has been rotated to the cutting position of the sheet and generates a cutting signal for each cutting.

The remaining length is the length of the distance to the rotary cutter 3 of a defective portion which moves every moment as the sheet travels and changes with the movement.

The rotary cutter control section 30 is a control circuit for controlling the rotation of the motor 31 for rotating the rotary shaft of the rotary cutter 3 by servo control. This rotation control is performed by the signal φ _A from the travel distance measuring sensor 22 and the cutting. Detection sensor 2
3, a signal φ _B from the pulse generator 32 for detecting the rotation of the motor 31, a signal L ₀ corresponding to the product cutting length set by the production management device 10, and a rotation circumference of the blade of the rotary cutter 3. This is performed based on the signal B ₀ .

In the embodiment having the above-described configuration, when controlling the sheet cutting by the rotary cutter 3 and detecting by the defect detecting sensor 21 that the corrugated sheet contains a defective portion, the sheet cutting dimension switching circuit is provided. 20
Is controlled so as to switch to the defective part cutting dimension as follows, and after all the defective parts are cut to a common length, the defective parts can be removed by the diverter 4. Hereinafter, the sheet cutting dimension switching operation will be described with reference to the flowchart of FIG. 2 and the operation explanatory diagram of FIG. Before describing the operation, various modes of defect detection will be described as follows.

The defect detection signal includes a signal generated by directly detecting a defect, such as the defect detection sensor 21 for detecting a defect on the sheet surface or a sensor for detecting a step formation defect. A signal indicating a discontinuity or an overlapped portion of a paper splice, a slit or a ruled line as an indirect defect, such as a splice signal or a signal for switching a slitter / scorer, and an operation such as a sheet running which causes a defect due to an adhesive displacement. There are indirect defect detection signals such as a signal indicating a change, and all the parts that generate these signals are included in the defect detection sensor of the present invention.

In this embodiment, the length of the defective portion cut by the rotary cutter 3 is different from the product cut length in all cases. The same prescribed length,
When the defective portion is long and cannot be accommodated by one cut number, the cut number is increased, and when the defective portion is short, the cut number is reduced.

[0024] As the tip P of the defective portions shown in FIG. 3 (a), is detected by the defect detection sensor 21 in step S _1, the sheet cutting dimension switching circuit 20 when the failure detection signal is input, the counter A value corresponding to the traveling length (equipment length) of the sheet from the position of the failure detection sensor 21 to the rotary cutter 3 which has been input in advance (L = L in the example of FIG. 1)
50m) is preset (S _2). Next, since the defective portion of the sheet travels even after being detected, the counter value is obtained by the signal of the travel distance measuring sensor 22 in order to obtain the instantaneous remaining length up to the rotary cutter 3 at that moment. (S ₃ ).

Furthermore, every time the sheet is cut by the rotary cutter 3 in the sheet cutting size switching circuit 20 together with the subtraction, since disconnection detection signal is inputted from the cut detection sensor 23, the cut detection signal in step S ₄ is input The following calculation is performed at each of the determined timings. First, step S ₅
It is determined whether a defective fixed-size cutting is in progress. The necessity of this determination will be described later. In the first stage, the judgment is always N because the switch to the defective fixed length cutting has not yet been performed.
O.

[0026] Therefore, the process proceeds to step S _6, wherein the product in the example (FIG. 3 which is next product cut length after next partial sum length of the comparison the remaining length obtained is in each case the comparison determining unit by the subtraction The cutting length is 1.5 m). Since the control operation is immediately shifted to the next cutting dimension when the cutting detection signal is generated, the switching of the next cutting dimension cannot be completed in time for the generation of the cutting detection signal. Therefore, a comparison is made with the sum of the next and subsequent cut dimensions.
The total length of the next and subsequent batches is constant while the product is cut in the same lot, but changes before and after switching to a lot with a different product cut length.

As the sheet advances, the leading end P of the defective portion is shown in FIG.
As shown in (b), when the width reaches the width to be cut one after another, as a result of comparison with the remaining length at that time, the remaining length becomes less than the total length of the product length for the next and subsequent product lengths, and step S _{At 7} , switching to the defective fixed-length cutting of the defective portion is performed. At this time, the next cutting control is started immediately after the generation of the cutting signal, and the next successive cutting control is switched to the defective fixed-length cutting. When switched to poor fixed-length cutting in step S _7, the switching signal is issued from the sheet cutting dimension switching circuit 20 to the rotary cutter control unit 30, based on this switching signal, the rotary cutter control unit 30, production control apparatus 10 after next is controlled to disconnect the bad spots cut dimension K ₀ that is set to, FIG. 3 (c), the size K ₀ an after next as shown in (d)
(= 1 m) to obtain a defective fixed-size sheet.

[0028] When the defective Blank cutting is performed, the subtracting counter returns to step S _3, Step S ₄
Disconnect signal by the execution of the failure Blank cutting in is detected by the disconnection detection sensor 23 is a determination of whether a defective standard dimension during the cutting at step S ₅ again. This time is determined from defective Blank cutting switching signal is out is YES, the next step S ₈ defective fixed size sheet cutting number N required is that of determining whether a plurality performed. This is because, as described above, in the defective fixed-length cutting, the causes of the defective portion are variously varied, and the defective portion may be long or limited to a certain length depending on the cause. Therefore, the number of defective fixed-length cuts is determined in advance for each cause of occurrence, and the number is determined according to the type of cause of occurrence. For example, when detecting splicing of the base paper, two or three sheets are set behind the detection point, and when forming a step defect or switching the slitter scorer, one sheet including the detection signal point is set. FIG. 3 (d)
In the figure, two defective fixed-size sheets are shown.

[0029] The defective fixed-length cutting run N-1 times in step S ₉ If YES is determined in the defective fixed size number of sheets,
If N = 1 immediately proceeds to step S _10.

[0030] When the remaining length in step S ₁₀ is equal to or less than a single defective portion cutting dimension, and resets the sheet cutting dimension switching circuit 20 in step S ₁₁ have finished the defective fixed size cutting, sheet cutting from the circuit the output size switching signal is stopped, to return the cut length by the rotary cutter control unit 30 to the product cut length L ₀ of the previous normal product it.

It is sufficient that the failure detection signal is generated at a point in time when switching to the failure fixed-length cutting control for cutting the failure portion can be made in time.
What is necessary is just to provide at the upstream position more than the predetermined product cutting length, and if it is fixed at the upstream position more than the maximum product cutting length, the cutting dimension switching method of the present invention can be applied to any cutting length. Can be implemented.

Although not shown in the drawings, when the above-mentioned defective fixed-length cutting is performed, a cutting signal is sent to the diverter 4 to drive the driving unit (cylinder) so that the defective portion is removed from the transport path. Four control circuits are provided.

[0033]

As described above in detail, according to the sheet cutting dimension switching method of the present invention, a sheet defective portion generated in the manufacturing process is detected by the sensor, and when the defective portion approaches immediately before the rotary cutter, the cutting mode becomes defective. Since the method is switched to the fixed-size cutting mode, if this method is used to cut a sheet at a fixed cutting length including a defective part, the cutting length of the defective part is the same even if the product cutting length differs for each lot. Since the cutting is performed at this point, the defective portion can be removed from the transfer line with a uniform length regardless of the cause of the defect, and there is an advantage that the defect removal and the subsequent processing work are facilitated and the work can be rationalized.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a schematic configuration near a rotary cutter of a corrugator machine and a control circuit including a sheet cutting dimension switching circuit.

FIG. 2 is a flowchart showing switching to a defective fixed-length cutting mode by a sheet cutting dimension switching circuit;

FIG. 3 is an explanatory diagram of a defective fixed-size cutting operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 double facer 2 slitter / scorer 3 rotary cutter 4 diverter 10 production management device 20 sheet cutting dimension switching circuit 21 defect detection sensor 22 running distance measurement sensor 23 cutting detection sensor 30 rotary cutter control unit

────────────────────────────────────────────────── (5) References JP-A-54-117291 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B31B 1/00-49/04 B31F 1 / 00-7/00 B65H 1/00-47/00

Claims (1)

(57) [Claims] In a process of continuously manufacturing sheets and cutting the manufactured sheets to a predetermined cutting length for each lot by a cutter, a defect detection sensor provided at a position upstream of the cutter by a product cutting length or more. After a sheet defect is detected, each time a cutting signal is generated, the sum of the next and subsequent product cutting lengths and the remaining length up to the cutter of the defective portion are repeatedly compared. A sheet cutting dimension switching method, wherein a cutting length is switched to a defective part cutting dimension.