JPS61205809A - Apparatus for detecting posture of corrugated board piece in box manufacturing machine - Google Patents

Abstract

PURPOSE:To make it possible to automatically detect the abnormality of the posture of a corrugated board piece, by mounting at least two or more of optical pickups, a feed speed signal generator and an operator. CONSTITUTION:A gap is provided between a corrugated board piece 1a and optical detection pickups 14 and reflected light is received during the passage of the board piece 1a but is not received when said board piece 1a is detached. When the board piece 1a obliquely runs, said board piece 1a is not detected from voltage VN when a switch was tuned ON upon the detection of the board piece 1a and the timing changed over to voltage VF, when the switch was turned OFF, is shifted to generate time differences DELTAt1, DELTAt2 which are, in turn, detected by the pickups 14. These time differences correspond to the inclination quantity of the board piece 1a. The inclination quantity tan theta (angle theta of inclination) is obtained by a formula V.DELTAt/B (wherein V is the running speed of the board piece 1a and B is the installation interval of the pickups 14). Next, when calculation is carried out by an arithmetic unit 16, the output signal confirming the oblique running state of the board piece 1a can be taken out. Subsequently, this signal is transmitted to a posture control apparatus or an abnormal paper discharge apparatus to receive processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a detection device for monitoring abnormalities during box forming in a corrugated box making machine, particularly abnormalities in the posture of corrugated paper pieces.

(Prior art) A box making machine is equipment that forms boxes from normal quadrilateral corrugated paper cut into predetermined dimensions using a corrugator, which is a pre-processing line. Cut off the sections, add ruled lines, print, fold and glue to create the shape of the box before assembly.

Since the box making machine has various processing functions as described above, each processing is divided into units, and the corrugated paper pieces to be processed are continuously and intermittently fed through each series of units.

Although the device according to the present invention can be applied to each uni-gutter section and before and after, in order to explain the difference from conventional devices, we will use the paper feeding section, which is the first unit of a box making machine, as an example. I will explain. FIG. 7 shows a side view of a conventional paper feeding section. In the figure, in G1, 1 is a stack of corrugated paper pieces before processing, 1a is a corrugated paper piece that has been sharpened by a Ki-7 car 2 and is being fed, and 2 is placed on a table 3, as shown by the arrow. The corrugated pole is a picker that reciprocates in the feeding direction of the paper strips 1a, and forms a fork shape.

4 is a connector fixed to the base of the kicker 2;
7 is a link rotatably connected to the connector 4 via a pin 6, 7 is a lever whose end is rotatably connected to the link 5 via a pin 6a, and 8 is the other end of the lever 7. 9 is a rotating disk; 10 is a pin that is fixed to the end face of the rotating disk 9 and is movable in the notch of the arm 8; 11 is an arm that aligns the stacked cardboard pieces l; a shielding plate erected with a gap that allows the corrugated paper piece 1a to be kifked to pass; 12 is a pair of feed rolls;
13 is a processing unit for printing, etc.

In this device, as the rotating disk 9 rotates, the rotating circles Fj, 9
The pin 10 fixed to the arm 8 also rotates, and at this time the pin 10 slides inside the notch of the arm 8, so that the arm 8 performs a swinging motion. Along with this, the lever 7 fixed to the arm 8 also swings, and the bottle 6as link 5 and the pin 6
, the kicker 2 reciprocates on the table 3 via the connector 4. The corrugated paper pieces 1a are fed out one by one by the reciprocating movement of the kinker 2, and then sandwiched between a pair of rotating feed rolls 12 and fed to the next processing unit 13.

However, the conventional box making machine described above has the following problems. FIG. 8 is a perspective view showing a state in which a piece of corrugated paper is being kicked. The corrugated paper pieces are not necessarily fed parallel to the width direction, but may be fed obliquely as shown by the dotted line in FIG. this is,
The corrugated paper piece 1a has variations in paper quality in the width direction,
Since warpage, deformation, etc. occur during manufacturing, the frictional resistance between the corrugated paper piece 1a and the top of the table 3 and the load distribution received from the corrugated paper piece 1 stacked on the corrugated paper piece 1a are uniform. However, the frictional resistance is not necessarily uniform in the width direction of the paper piece, and is caused by an imbalance in the feeding force in the width direction.

Further, such a defective phenomenon of oblique feeding may occur not only in the above-mentioned paper feeding section but also due to an imbalance of forces in the width direction during processing in each unit. If the corrugated paper pieces are fed diagonally, the printing unit may be distorted or blurred.

In the case of a punching unit, punching twist etc. will occur, and if the amount of inclination is large, jam-up will occur in each unit, which is inconvenient.

(Problems to be Solved by the Invention) As described above, in the conventional box making machine, while feeding corrugated paper pieces, the paper pieces are deviated diagonally from the front and back with respect to the feeding direction, and Even if the system collapses, there is insufficient monitoring,
In the processing in the next step, the paper is often processed in the same position, which causes problems such as printing distortion and blurring.

The present invention has been made in view of this point, and is intended to automatically detect abnormalities in the posture of corrugated paper pieces.

(Means for Solving the Problems) For this reason, the present invention provides a box making machine in which at least two or more corrugated cardboard pieces are continuously and intermittently fed in a direction substantially perpendicular to the feeding direction (width direction). An optical detection big amplifier arranged in the vicinity of the paper strip, a corrugated pole paper strip feeding speed signal transmitter, and a time difference between the passing signals of the corrugated paper strip detected by the plurality of optical detection pickups and an inclination of the corrugated paper strip. The present invention is configured to include an arithmetic unit that calculates quantities, and this is used as a means for solving the above-mentioned problems.

(Function) A plurality of optical detection big amplifiers detect the passage of different ends of the corrugated paper piece being fed, and the time difference between them is taken, and the amount of inclination of the paper piece is calculated via a calculation device. . If this calculated value exceeds the predetermined standard value,
If necessary, issue an alarm, etc., or stop the machine in some cases.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a partially cutaway side view of a feeding section showing an application example of the detection device according to the present invention, and FIG. 2 is a side view of the inter-unit portion showing another application example of the detection device according to the invention. FIG. 3 is a block diagram of the detection device, FIG. 4 is a schematic diagram showing a detection method, FIG. 5 is a waveform example of a detection signal, and FIG. 6 is a schematic diagram showing another detection method.

The embodiment shown in FIG. 1 is an example in which the detection device according to the present invention is applied to a paper feeding section. In the figure, symbols 1.1a, 2.3.
12 has the same structure as the conventional device shown in FIG. 7, so its explanation will be omitted. Reference numeral 14 indicates a plurality of optical detection pins 7 that are buried in the table 3 and are provided in the width direction of the table.
The optical detection pickups 14 are coupled to a computing device 16 by a cord 15 coupled to each optical detection pickup 14 . The optical detection pickup 14 used here is a photosensor that detects the reflected light from the detection object due to the light emitted from the pickup 14.As for the type of photosensor, an optical fiber type can be adopted, or the pickup A photoelectric switch system in which the switch 14 itself has a switching function may be adopted.

In the case of the optical fiber system, the optical detection pickup 1 and the cord 15 are composed of optical fiber cables for both light emission and light reception, and the switching function is built into the arithmetic unit 16. If the photoelectric switch method is used, the pickup 14 has a sensing function, so the code 15
is composed of electric wires for conducting the detection signal.

The application example shown in FIG. 2 shows an example in which the detection device is arranged between units. 17 indicates an upstream unit, and 18 indicates a downstream unit. The corrugated paper piece 1a is fed from an upstream unit 17 to a downstream unit 18. Here the optical detection big amplifier 14 is arranged between the two units 17.18. The type and configuration of the detection device may be the same as those described above.

However, in this example, unlike the above example, the corrugated paper piece 1a
Since there is no obstruction such as a table on the back side of the sensor, a sensor 19 as shown by the dotted line in the figure may be arranged to adopt a transmission sensing method.

The transmission method is a type in which a light-emitting side sensor and a light-receiving side sensor are placed opposite each other, and an object to be detected travels between the two sensors.

FIG. 3 shows a perspective view of the optical detection pickup arrangement of the embodiment shown in FIG. 1, and also shows a detailed block diagram of the arithmetic unit 16. The type of optical detection pickup used here is an optical fiber type. 20 is a light emitting element including a light emitting source; 21 is a light receiving element composed of a phototransistor or a photodiode, which also has a switching function; and 22 is a photoamplifier that amplifies the voltage of the switch signal, that is, the step response signal obtained by the light receiving element 21. , 23 is a feed speed signal transmitter for the corrugated paper piece 1a using a measuring means such as a low-resolution encoder;
24 is a computing unit that receives signals from the plurality of photo amplifiers 22 and the feed speed signal transmitter 23 and calculates the time difference between the passing signals of the corrugated paper pieces detected at each detection position and the amount of inclination of the corrugated paper pieces; 25; is the output terminal.

The optical detection pickup 14 is arranged in a direction (approximately perpendicular to the width direction of the traveling corrugated cardboard piece 1a, that is, the traveling direction).
If you place at least two or more on the P-P line (Fig. 3),
The diagonal running property of the corrugated pole paper piece 1a can be detected. The reason why the pickups are arranged almost at right angles here is that even if they are not arranged at right angles, if the amount of deviation of the installation position from the P-P line is known, corrective calculations can be made in the signal processing section later. Depends on something.

Next, the operation of the detection device according to the present invention will be explained.

As a reflective sensing method for the corrugated paper piece la, the methods shown in FIGS. 4 and 6 can be considered. FIG. 4 shows a method in which a gap is provided between the cardboard piece 1a to be detected and the optical detection pickup 14, so that the reflected light is received while the cardboard piece 1a passes through, and no light is received when it comes off. show.

In the figure, fi+ is the state in which the corrugated paper piece 1a is passing, (2) is the state in which the corrugated paper piece 1a is removed when there is no obstruction on the upper surface of the corrugated paper piece 1a that is being passed, and (3) is the upper surface of the corrugated paper piece 1a that is being passed. This shows the state in which the corrugated paper piece 1a has come off when there is an obstruction. In this case, the same figure (1
), place the cardboard piece 1a on the pickup 14.
The light-receiving element 21 is turned on by receiving the reflected light from the cardboard piece 1a while it passes, and the switch is turned off when it comes off as shown in (2) and (3) in the same figure.
The switch function must be adjusted. Therefore, in the case of (3) in the same figure, the ON of the switch operates in the range from d to d, and the OFF of the switch operates in the range of d and above.
It is necessary to adjust the level of the amount of light received by N10FF.

FIG. 5 shows an example of a signal waveform detected in the arrangement of the detection device shown in FIG. Both are output waveforms of the photoamplifier 22, and the amount of voltage with respect to the time axis is shown. Fifth
In the figure, VN is the corrugated paper piece 1a in Figure 4 (11).
is detected and the voltage level when the switch is turned on is
VF- indicates the voltage level when the corrugated paper piece 1a is not detected and the switch is turned off in FIGS. 4(2) and (3). Therefore, the moment the cardboard piece 1a comes off the pickup 14, the switch changes from VN to V.
It will switch to F.

4 (1), (2), and (3) are output waveforms from the respective pickups 14 arranged in the width direction of the corrugated pole paper piece 1a via the amplifier 22.
When a runs diagonally, the timing of switching from VN to VF shifts as shown in FIGS. 5(1), (2), and (3), resulting in time differences ΔtI and Δt. This time difference corresponds to the amount of inclination of the corrugated paper piece 1a, and the inclination it tanθ(
The inclination angle θ) is obtained by ■·Δt/B.

However, here, V is received from the feed speed signal transmitter 23 at the traveling speed of the corrugated paper piece. Δt is the time difference detected by two arbitrary pick amplifiers, and B is the interval between the installation positions of the two pickups.

FIG. 6 shows an optical detection pickup 14 connected to a cardboard piece 1.
A method is shown in which the light is not received while the corrugated paper piece 1a is passing, and the upper corrugated paper piece 1 is detected as soon as the corrugated paper piece 1a comes off. In this case, Fig. 6 (1
), the output signal becomes VF, and in state (2), the output signal becomes VN.
Therefore, 0N10FF is reversed.

According to the arrangement of the pickup 14 as shown above,
Since the switching signal of the switch is obtained at the end face of the corrugated paper piece 1a as shown in FIG. Posture 1a,
That is, the state of diagonal running is recognized and an output signal can be taken out at the output terminal 25. The signal from the output terminal 25 is sent to the posture control, abnormal paper ejecting device, etc., and is processed.

(Effects of the Invention) As explained above in detail, the present invention has the advantage of being able to quickly detect the posture of the fed corrugated paper piece because it is detected optically using a simple method. This makes it possible to monitor the processing quality in the box making machine, and also to improve and stabilize the quality by connecting it to a corrugated paperboard posture correction device.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the paper feed section showing a typical example of a detection device according to an embodiment of the present invention, Fig. 2 is a schematic diagram showing another detection method, and Fig. 7 is a conventional box making machine. FIG. 8 is a side view showing the paper feeding section, and a perspective view showing a state in which a piece of corrugated paper is kicked. Explanation of the main parts of the diagram 1a, single corrugated cardboard piece 2, key, 7 car 14... - Optical detection backup 16 - Computing device patent applicant: Mitsubishi Heavy Industries, Ltd.
Ryomei Giken Co., Ltd. Figure 1 Figure 6 Procedure? City official document (method) July 4, 1985 Michibe Uga, Commissioner of the Patent Office1, Indication of the case Patent Application No. 1983-459982, Name of the invention Device for detecting the posture of corrugated paper pieces in a box-making machine3, Relationship with the case of the person making the amendment Patent applicant address 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Name
(620) Mitsubishi Heavy Industries, Ltd. 1 other person 4, agent address: 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Heavy Industries, Ltd. Name (6124) Patent attorney Akira Sakama, 2 other people 5, sub-agent 7. Target of amendment Contents of amendment 1, “Figure 5 fil (2) on page 13, line 16 of the specification
1 (3) is a waveform diagram of the detection signal,'' was changed to ``Figure 5 is a waveform change diagram of detection/No. 79, (1) (2) (3) shows each output waveform,''

Claims (1)

[Claims] In the box making machine, at least two or more optical detection pickups are arranged in a direction substantially perpendicular to the feeding direction (width direction) of the corrugated paper pieces that are continuously and intermittently fed in the vicinity of the corrugated paper pieces; of a corrugated paper piece in a box making machine comprising a feeding speed signal transmitter, and a computing unit that calculates the time difference between the passage signals of the corrugated paper piece detected by the plurality of optical detection pickups and the amount of inclination of the corrugated paper piece. Posture detection device.