JPH01164591A - Automatic diagonal remover for sheet cutter - Google Patents

Abstract

PURPOSE: To automatically perform sheet diagonal removing with good productivity within a short time by calculating 'diagnoal amount' generated by a spiral cutter based on the transfer speed of a sheet and the rotational speed of a cutter and controlling the driving of the oblique angle adjustment motor of the cutter by an adjusting amount calculated based on the calculated value thereof and a current value. CONSTITUTION: A cutter is rotated while an original sheet is released, the transfer speed of this sheet and the rotational speed of the cutter are measured by measuring means 15 and 17, the measured values are inputted to a computing means 18 and, by this computing means 18, 'diagonal amount' generated by the spiral cutter of the cutter is calculated. The driving of the oblique angle adjustment motor 10 of the cutter 5 is controlled by a control means 21 based on the calculated value thereof and a current value. Thus, a screw is rotated by the controlled driving of the motor 10, the oblique angle of the cutter is adjusted, and when 'diagonal amount' becomes zero, the motor 10 is stopped and then sheet diagonal removing is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the invention (industrial application field) The present invention is an automatic diamond collecting device for a sheet cutter used in the processing industry of paper (1) synthetic resin films, metal foils, etc. More specifically, the present invention relates to a device that automatically calculates the amount of diamonds that changes depending on the sheet transport speed and the number of revolutions of the cutter, and automatically adjusts the oblique angle of the cutter based on this calculated value to perform diamond cutting.

<Prior art> Paper 1 In the industry that processes sheets of synthetic resin films, metal foils, etc., when flattening the original roll of the sheet,
Generally, the cutter 23 is rotated as shown in FIG.
A method is adopted in which the cutting dimensions of the transfer sheet are determined by adjusting the rotation speed. In this case,
To facilitate cutting of the sheet, the blade 2 of the cutter 23
4 is attached to a drum 25 in a spiral manner as shown in FIG. 7, so that the sheet 26 is sequentially cut from one end to the other. Therefore, the sheet 2 that you want to cut into squares
6 is cut into a parallelogram as shown in FIG. 4 by attaching the blade 24 in a spiral shape, and the difference in size between one end and the other end of the cut end of the sheet 26 at this time is as follows:
Generally speaking, it is called "the amount of rhombus".

Since this "diamond amount" L varies in proportion to the cutting length of the sheet 26, the current situation is to adjust it every time the cutting length is changed so that cutting without "diamond amount" is performed. To do this, input the corresponding values into the formula, calculate the diamond adjustment amount, move the screw 27 for adjusting the oblique angle of the drum 26 in the cutter 23, and adjust the sheet 26 as shown in FIG.
This adjustment work significantly reduces the movability of the sheet cutter and the yield of the product, and the accuracy of the product quality also deteriorates. However, this method also has the problem of requiring the operator to be highly skilled in adjustment techniques.

The present invention was made to solve the above-mentioned conventional problems, and when the rotation speed of the cutter is adjusted to change the cutting length of the sheet, the corresponding amount of diamonds is automatically calculated. The object of the present invention is to provide a device that automatically performs diamond cutting by setting an appropriate oblique angle of a cutter.

1. Structure of the Invention (Means for Solving the Problems) The means of the present invention for achieving the above-mentioned object is to unwind the original roll of the sheet 1, transport it by the transport means 2 and 3, and transfer it to the spiral blade. The sheet cutter cuts the continuous sheet 1 into a desired size by rotation of a cutter 5 to obtain a flat product 1'' from the continuous sheet 1, which includes a means 15 for measuring the speed of the conveying sheet 1, and a rotation speed of the cutter 5. a calculation means 18 for calculating the rhombus iL based on these measured values, and a control for controlling the driving of the oblique angle adjustment motor 10 of the cutter 5 based on the calculated value and the current position. This invention resides in an automatic diamond-cutting device for a sheet cutter, characterized in that it is provided with a means 21.

(Function) In the apparatus of the present invention configured as described above, when the sheet cutter SC is operated and the cutter 5 is rotated while unwinding the raw sheet 1, the measuring means 15 measures the transport speed of the sheet 1. The measuring means 17 detects the number of revolutions of the cutter 5 and inputs it to the calculating means 18 . Then, the calculating means 17 calculates the cutting length of the sheet 1 using the following formula % formula % (1) La: Sheet cutting length V Niji-[・Speed measurement value R: cutter drum rotation value 1: coefficient The display means 19 digitally displays this, and based on the calculated sheet cutting length, the following formula % formula % (2) Lb: Calculated value (amount of rhombus) La: Sheet cutting length 2: Coefficient α: Calculate the rhombus amount L based on the correction value and send it to the position confirmation means. Then, the position confirmation means calculates the movement value of the cutter 5 using the following formula % formula % (3): Ld: Current position Lb: Calculated value, and calculates the movement value of the cutter 5 using the following formula
is activated, the oblique angle of the cutter 5 is adjusted with the screw 11, and when the "amount of lozenges" L becomes zero, the motor 10 is stopped and the diamond cutting is completed, so the diamond cutting is automatically completed. It is.

(Example) An example of implementation of the apparatus related to the present invention will be described below based on the drawings.

In FIG. 1 of the drawings, SC is a conventionally known sheet cutter, and includes a feed roller 3 that unwinds the sheet 1 from a web take-up (not shown in the drawings) and transports it in cooperation with a pinch roller 2; The feed roller 3 is equipped with a cutter 5 that cuts the conveyed sheet 1 in cooperation with a receiving blade 4, and the feed roller 3 described above is driven by a known variable speed drive means to adjust its rotation speed. The cutter 5 is configured to be able to freely adjust the speed at which the cut sheet 1 is transported, and the cutter 5 is configured to have a drive capable of steplessly changing the speed in order to adjust the cutting length of the sheet 1 by adjusting its rotation speed. The sheet is driven by means (not shown), and the blade is attached to the drum a at a spiral angle of θ0 as shown in Fig. 3, so that the blade cuts the sheet sequentially from one end to the other. In this way, cutting is facilitated. When the cutter 5 is positioned so that its axis is perpendicular to the running direction of the sheet 1, the sheet 1 is cut diagonally and the fourth
As shown in the figure, the cutter 5 has one bearing 6 supported by the pivot 7 and the other bearing 8 in order to prevent this. is supported by a sliding guide 9 and screwed onto a screw 11 rotated by a drive motor 10, and is moved by the rotation of the screw 11 to adjust the oblique angle with respect to the seat 1 as shown in FIG. By doing this, the "amount of rhombus" L caused by the spiral angle θ° of the cutting edge becomes zero, and the sheet 1 is cut correctly at 90' with respect to its side edge. The sheet 1 is sent to the next process by the cooperation of the upper and lower conveyor belts 12,13.

In FIG. 6, SC is a control means for automatically adjusting the oblique angle of the cutter 5 described above, and a transmitter 14 equipped as shown in FIG. Sheet speed measuring means 15 receives an electrical signal output according to the rotational speed of the sheet 1, converts it into a moving speed of the sheet 1, and sends it to a computing unit to be described later.
and a transmitter 1 equipped to the cutter 5 as shown in FIG.
6 receives an electric signal output according to the rotation speed of the cutter 5, converts it into the rotation speed of the cutter 5, and sends it to a computing unit to be described later; and the measurement means 15 described above. The cutting length of the sheet 1 is calculated using the formula (1) described later based on the transport speed of the sheet 1 fed from the feed speed and the rotation speed of the cutter 5, and the "diameter amount" I- is calculated using the formula (2). A computing unit 18 that calculates
A display means 19 that digitally displays the cut length of the sheet 1 calculated by The movement value of the cutter 5 is determined by (3), and the screw 11 is controlled by the drive motor 10 via the amplifier 20.
The control means 21 that drives the cutter 5 until L reaches zero and stops when it reaches zero, and the oblique angle setting of the cutter 5 set by the above operation are inappropriate. If the amount "L" does not become zero, a correction means 2 measures the error and adds this value to the calculator 18 to correct the error.
2.

Sheet cutter A, which uses the automatic diamond-cutting device shown in the above embodiment, and conventional sheet cutter B, which manually adjusts the "amount of diamonds," both set the rolled fabric on the fabric hook and transport it. At the same time, unraveling and transport by the means are started, and the operation of cutting the sheet by rotating the cutter is performed under the conditions (1) to (4) described later, and the cut product is extracted and measured. The time required until then is the end of the 14B operation when the amount of diamonds L becomes zero,
The length of the lost sheet and the yield rate were investigated, and the lithographic products when the amount of heat sealing became zero were used as samples 1 to 4, and the dimensional errors were measured, as shown in Tables 1 and 2. there were.

(1) A roll of thin paper having a metric weight of 30 g/m 2 was transferred and cut into 1100 mm width x 1270 mm length using a rotary cutter to obtain planographic paper of sample 1.

(2) Transfer a roll of kraft paper with a metric weight of 81 g/m2 and cut it into a width of 1100 mm using a rotating cutter.
The lithographic paper of Sample 2 was obtained by cutting it into a length of 1270 mm.

(3) A roll of cardboard base paper (liner) with a metric weight of 240 g/m2 was transferred and cut into a piece of 1100 mm wide x 1270 m long using a rotary cutter to obtain planographic paper of sample 3.

(4) A roll of white paperboard with a metric weight of 550 g/m 2 was transferred and cut into a piece of 1100 mm wide x 1270 m IT+ long to obtain planographic paper of sample 4.

In addition, in order to investigate the results when the dimensions and materials of the cut sheets were changed in addition to the above examples, we conducted experiments in which the cutting dimensions of each material in the above examples were changed and the material was changed to a rolled aluminum foil. Similar cutting was carried out, but the results were no different from those of Examples 1 to 4 described above, so a description thereof will be omitted.

C1 Effects of the Invention As mentioned above, the device of the present invention calculates the "amount of rhombus" produced by the spiral blade based on the sheet transport speed and the rotation speed of the cutter, and adjusts it based on the difference between this calculated value and the current position. As it is clear from the ratio 3 in Tables 1 and 2, the time required to remove diamonds is 1/4 because the drive motor for the screw that adjusts the oblique angle is activated to automatically perform diamond cutting.
Below, the amount of waste paper has been reduced to less than 1/8, and the product yield has been reduced to 7.
% or more, it is particularly effective in improving machine availability, reducing the amount of paper waste, and improving product yield and product accuracy.

[Brief explanation of the drawing]

The drawings show an automatic diamond cutting device for a sheet cutter according to the present invention, and FIG. 1 is a side view showing the main parts of the sheet cutter. Figure 2 is a front view of a portion of the cutter. FIG. 3 is a side view showing the spiral angle of the blade of the cutter. FIG. 4 is a plan view showing a sheet that has been diagonally cut by the spiral angle of the same blade, resulting in a "diamond shape". FIG. 5 is a plan view showing the sheet after diamond cutting has been performed by placing the cutter obliquely across the sheet. FIG. 6 is a block diagram showing the configuration of the device. FIG. 7 is a side view of a conventional sheet cutter. In the figure, 2.3 is a conveying means for the sheet 1, 5 is a cutter equipped with a spiral blade, 15 is a means for measuring the conveying speed of the sheet, and 17 is a rotation speed measuring means for the cutter 5. Table 1 Table 2 1. Indication of the case Patent Application No. 319197 of 1988 2. Name of the invention Automatic lid removal device for sheet cutter 3. Relationship with the person making the amendment case Patent application Place of residence
5-5-7-4 Yoshiwara, Fuji City, Shizuoka Prefecture, Agent postal code: Prisoner (2) 4-口口5, 1. Detailed explanation of the invention in the specification to be amended and 1. Document evidencing the power of attorney. 6. Contents of the amendment In the specification, from line 7 to line 6 from No. 10T1, the phrase ``1 heat seal amount'' is corrected to ``diamond amount.'' From then on

Claims (1)

[Claims] In a sheet cutter for obtaining a flat product from a continuous sheet by unwinding a rolled sheet, transporting it by a transport means, and cutting it into a desired size by rotating a cutter equipped with a spiral blade, the speed of the transport sheet is controlled. a means for measuring, a means for measuring the rotational speed of the cutter, and a calculation means for calculating the amount of rhombus based on these measured values;
An automatic diamond cutting device for a sheet cutter, comprising: a control means for controlling driving of a motor for adjusting an oblique angle of the cutter based on a calculated value and a current position.