JPS58149199A - Detector for cutting mark in cutter for tabular material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a cutting mark detection device that is used in a cutting device for cutting plate materials such as corrugated cardboard sheets on which cutting positions (cutting marks) are printed in advance. Fig. 1 is a schematic diagram of this type of cutting device; Fig. 2 is a schematic diagram of the cutting marks preprinted on the sheet.

[Indicate each. As shown in both figures, the cut mark 2t is conveyed to the pre-printed cutter 3 and filtered, and the cut mark 2 is detected by the optoelectronic switch 4 for mark detection. Then, the digital controller 5 calculates the sheet speed, the sheet movement amount, the knife position of the cutting device 3, the knife speed, etc., and the control device 6 controls the drive of the motor 7 based on the calculated signals. Cutting ff - Aiming at ri 2, the cut is made. 8 is an operation panel for inputting data such as the distance between the optoelectronic switch 4 and the cutting end point of the knife, and issuing commands for operation, stop, etc.; 9 is a reducer between the cutting device 3 and the DC motor 7; 10 is a DC motor; 7 is a tachometer generator directly connected to the speed feedback, 11 is a pulse transmitter for the knife position feed pack attached to the knife shaft, 12 is a proximity switch for cutting detection, and %13Fi is a proximity switch for measuring the amount of sheet movement. A rotary measuring wheel 14 indicates all pulse transmitters directly connected to the measuring wheel 13 for detecting the amount of sheet movement. Note that the arrow ■ in the figure indicates the traveling direction of the sheet 10. Sheet IK in such a plate-shaped material cutting device is the sheet 1 that is misjudged as the cutting mark 2 in addition to the cutting mark 2.
There may be stains or print dirt 15, which may cause malfunctions. To prevent this, one cut mark is detected using a conventional method. 0) As shown in FIGS. 3(a) and 3(b), an effective cutting mark detection area is set, and only the detection signal of the optoelectronic switch within the effective area is used as the cutting mark signal. The effective detection area t is from the cutting end point to the optoelectronic switch 4.
The moving distance of the sheet 1 is calculated as (L-m) and (L+b) from the cutting end point, and the moving amount of the sheet 1 starts from mark detection at point ti-a from the cutting end point and ends at mark detection at point L+b. (If the optoelectronic switch for mark detection continues to detect a certain length, it will be judged as a cutting mark,
A method for sending cut mark signals. That is, as shown in Fig. 4(a) and (b), the mark width t★ to be detected is detected, and if the detection width is greater than the set value, the cutting mark 2 is determined. ) VC, 17ij mark width setting device, 16 is a mark width detection device. Mark width detection device 16#'i While the optoelectronic switch 4 for mark detection is ON (during cutting mark detection) When the pulse amount of the pulse transmitter 14 for detecting the amount of movement reaches the value of the setting device 17, a cutting mark signal is output.When the pulse amount of the pulse transmitter 14 reaches the value of the setting device 17, the photoelectronic switch 4 is turned OFF. If so, the internal circuit (counter)
t is reset and no cutting mark signal is output. Mark to be set #IAeFi Set a value t smaller than the actual cutting mark width. Whereas the means of (c), b) and (b) are used only on one side of the photoelectronic switch 4t-sheet l for mark detection, #!
As shown in Figure 5 (straight), Φ], there are 1 on each side of the sheet 10.
A method in which two (total of two) photoelectronic switches 4 are provided, and both photoelectronic switches 4 simultaneously detect the cutting mark 2 preprinted on both sides of the sheet 1 and output a cutting mark signal the next time. In Figure 5), 18 is a control device for detecting and outputting two AND conditions of the photoelectronic switch 4. (b) Two photoelectronic switches for mark detection are provided, and as shown in FIG. 10 A method of outputting a cutting mark signal only when two photoelectronic switches detect cutting mark 2 at the same time by attaching the cutting mark at a position Kl& which is offset within the dimension of the mark in the width direction. (E) In contrast to the above-mentioned method 0, where two optoelectronic switches [are installed in the same row with respect to the sheet traveling direction I], as shown in Fig. 7, within the mark width a, the two photoelectronic switches If the two optoelectronic switches detect the cutting mark 2t' at the same time, the cutting mark is 0! method for outputting data. However, each of these conventional methods has the following drawbacks. Mark defects (see Figure 3, 01.(b)) This method assumes that the first cut cuts the true cut mark 2, and from the second time onwards, it attempts to detect marks only within the set effective area. That is. Therefore, the first detection of the cutting mark 2 after the start of operation must be an absolute mistake and a poor detection, but the first [i1! Since it is not possible to determine the effective area when detecting the J-th cutting mark (for control reasons, measurement of the sheet movement amount for effective area calculation is started at cutting detection, and as shown in Fig. 3(a)) (This is because it calculates the effective area t=(L+b)−(L−a))
, the first time it is necessary to kill this effective area circuit for detection, and it is not necessarily true that the true cutting mark 2t is detected. Furthermore, if this Jll first cutting mark 2 is detected incorrectly, all subsequent detections will also be incorrectly detected. Therefore, the condition is that there is no printing dirt in the stain on the sheet l that would cause IK erroneous detection in the first sheet of this method #i operation. Furthermore, even within the % effective range (usually set at t-20 to t-40), there is no guarantee that there will be no stains or print dirt on the sheet 1, so it cannot be said that this is a reliable mark detection method. Disadvantages of (b) (See Figure 4 (al)) Since this method detects the mark width (usually 4 to 7 cm), the mark width is determined by the presence of stains on the sheet that may cause false detection. Although it has to be larger than the print stain, it is not guaranteed that there will be no stains or print stains on the sheet 11 that are larger than the mark width, so it cannot be said to be a reliable mark detection method. (See Fig. 5 C1), 弽)) This method requires that the cutting marks 2t be preprinted accurately on both ends of the sheet 10 in the width direction so that there is no misalignment in the sheet traveling direction. The cost per sheet becomes high. Also, the degree of detection is 8 degrees of cutting (within 111 points from the center of the mark in the case of corrugated sheet bleed/lint equipment).
K shadow 41t - As a point of effect, the accuracy of the photoelectronic switch mounting position with respect to the sheet transport direction IK is improved as well as the accuracy of the cutting mark 2 printed on both ends of the sheet 1 with respect to the sheet traveling direction 1, but the mounting accuracy of the photoelectronic switch 4 is improved. It requires great precision and the equipment is complex and expensive. Disadvantage (b) (See Figure 6) (1) In the case of a normal cutting device for cutting sheets 1 of corrugated board, the cutting mark size α=4 to 7 mm. β = 20 to 25■, but in order to install the two optoelectronic switches in such a way that the spots (rays of light) are included within the dimensions of such a cutting mark, the external dimensions of the optoelectronic switch 4 must be
lJ@ is required. That is, it is required to be very small, which is not practical for such industrial machines. It is also possible to consider a method in which the optoelectronic switch 4t is sloped diagonally and two spots are placed within the cutting mark dimension for C) 111C, but the detection sensitivity of the optoelectronic switch 4 for mark detection is very delicate. , it is easy to malfunction even if there is a slight flapping of the sheet 1, etc., and the reliability is poor by <1kn%. (1) 402 photoelectronic switches are set in the sheet traveling direction■
Since there is K in the same row (same position) as shown in FIG. 8, thin lines and print stains 15 in the same row of the sheet 1 as shown in FIG. 8 are detected, resulting in erroneous detection. (See Figure 7) (Same as the disadvantage (1) of G-U described in 11) (I) No. 9
The first stain or print stain on the sheet 1 that is in the same phase as the spots 22 and 23 of the photoelectronic switch 4 as shown in the figure is detected. That is, once the detectable size of the optoelectronic switch 4 and the small (very small) spot spacing of the optoelectronic switch 4 are fixed, it is difficult to change. In other words, if the cutting mark width changes, which cuts should be detected! - When changing the width, i.e. h'l,
It is necessary to change the mounting interval of the photoelectronic switch 4, and it is not compatible with simple VC. In view of the above-mentioned drawbacks of the prior art, the present invention is a detection device that prevents erroneous detection due to sheet stains, print dirt, etc. in a cutting device for plate-shaped materials such as corrugated pole sheets, and accurately detects cutting marks. The basis of its technical philosophy is to provide The present invention, which has been achieved based on this technical idea, is based on the technical idea that the optoelectronic switches are shifted in both the sheet flow direction and the sheet width direction, and are combined with a detection signal control device using a shift register or the like. This is the basis. Embodiments of the present invention will be described in detail below based on the drawings. Note that the same numbers as those in the prior art are given to the same parts, and redundant explanations will be omitted. FIG. 10 shows the cutting device incorporated in the first embodiment of the present invention, and FIG. 11 shows the positional relationship between the spot (ray beam) of the photoelectronic switch (two) for detecting the cutting mark and the cutting mark. As shown in both figures, the detection of the cutting T-2 of the sheet 1 is carried out using photoelectronic switches 20 and 21 for detecting 12 cutting marks and a detection signal control value #M19. At this time, the photoelectronic switch 2 for detecting two marks
0.21 is for each spot (ray beam) as shown in Figure 11.
22 and 23 are attached in the sheet advancing direction I K e m and in the width direction of the sheet 1 so that both fm and fm are shifted within the cutting mark dimension. Here, 22 is a spot of the optoelectronic switch 20, and 23 is a spot of the optoelectronic switch 21. In this embodiment, as the sheet 1 advances, the cutting mark 2 is first cut by the optoelectronic switch 20 (slot) 22
) K is detected, and then, after the sheet l moves C2, it is detected by the photoelectronic switch 21 (spot 23). The distance between the two optoelectronic switches 20.21, i.e. the spot 22
．． The interval e of 23 is larger than the mark width C. To put it simply, when the optoelectronic switch 20 (spot 22) detects mark 2, this signal is shifted using the / register and then tracked by the device described later, until the e-arrival point (can be changed by setting). When the photoelectronic switch 21 (spot 23) detects mark 2, this second AND condition is used to generate a cutting mark signal. Therefore, even if one photoelectronic switch 20 or 21 detects stains or other defects on the sheet 1, the other photoelectronic switch 20 or #i
21, it will not be an erroneous detection. Here, based on FIG. 12, a more specific configuration of the detection signal control device 19! 52 Let me clarify. - In the figure, 14Fi pulse generator for seat movement detection, 20゜21ii optoelectronic switch for mark detection, 24゜25.26, 27, 2
8 is an 18-bit shift register, 29, 30, 31i
A 1t4-bit shift register and a 32#-i setting device are used to set the spot interval e■ of the optoelectronic switch 20, 21, and in other words, the distance at which the photoelectronic switch 20 should trace the entire signal when it detects the cutting mark 2. It is. 33Fi output stage AND element. Now, in order to make it easier to see, the distance between the spots 22 and 23 of the two optoelectronic switches 20.21 is C=38.
Garden cutting mark width tt = 4 ■ Spot width of optoelectronic switch 20.21 = 2 m++ Pulse transmitter 14 sheet movement distance conversion pulse 1 amount interval = 0.
4■/1 pulse. In this example, two detections are possible: detection based on the cutting mark width value and detection at one point within the cutting mark z. First, in the case of detection based on the cutting mark width value, the setting device 32 sets the actual optoelectronic switch 20 .
21, the spot spacing is shifted by e. Now, assuming that the cutting mark width to be detected is t-2, 38+2=40 is set in the setting device 32. In this case, when the optoelectronic switch 20 detects the cutting mark 2, the signal is
At the time of tracking, that is, when sheet 1 has moved 40 -, the signal is output (Qs small output 100' of shift register 31).
9' By ANDing the signal and the detection signal of the optoelectronic switch 21 using the AND condition 1iANDfi element 33 and outputting it, a cutting mark signal detected with the cutting mark width a can be obtained.
Similar detection is possible even if it is set to 36 wm'. Further, even if the cutting mark width aIri of the product to be detected changes, it can be easily adjusted by the setting device 32 without changing the mounting interval of the optoelectronic switches 20, 21. On the other hand, when detecting one point within cutting mark 1,
The actual spot interval C of the optoelectronic switches 20 and 21 may be set in the setting device 32 to be 38. That is, the Q1 signal (95Xo, 4=38) of the shift register 30 may be extracted as the tracking signal of the optoelectronic switch 20. In addition, in Figure 12, CP is 77 registers 24
~31 clock pulse input, D is data input, Qt
(1g indicates the bit-corresponding output of the shift registers 24 to 31, and CL indicates the reset input terminal. FIG. 14 is a timing chart at this time. The mark detection method of the detection signal control device 19 is based on two
A cutting mark signal is output only when the photoelectronic switches 20 and 21 continuously detect a cutting mark width equal to or larger than a certain set cutting mark width. That is, even if the cutting mark width is less than a set value and the width of the cutting mark is greater than the set value, if there is a break in the middle (not continuous), it is possible to determine that there is no mark to be cut. FIG. 15 is a block diagram of the detection signal control device 19 that outputs a cutting mark signal only when the photoelectronic switches 20 and 21 continuously detect the cutting mark 2t for a value greater than or equal to a certain set value. In the figure, 14 is a pulse transmitter for detecting the amount of sheet movement, 20 and 21#i mark i
0 photoelectron for detection ``4'' f・34・35・
41, 42, 43, 44, 45, 48, 49, 52° 53.54 are 4-bit shift registers, 37° 38.3
9.40#'i18-bit shift register, 36.50
．． 51 #1 AND 1 child, 46 is optoelectronic switch 20.2
1 spot interval ewmk setting device, 47#'i
The flip-flop 55 is an OR element. Now, to make the explanation easier, the actual cutting mark width αz 3.6 ■ Detection block/cutting mark width = 3.2
■ Pulse interval in terms of sheet movement amount of pulse transmitter 14 = 0.
4■/1 pulse. In this example, only when the optoelectronic switch 20 continuously detects a length of 3.2- or more, an output is provided to the AND bulge 36. This signal tsO is set in the setting device 46 in the same manner as described above.
The distance between the optoelectronic switch 20°21 and 38cm is tracked.
It is temporarily stored in the flip-flop 47. At this point, the optoelectronic switch 21 starts detecting the cutting mark 2, and only if the optoelectronic switch 21 also continuously detects the cut mark 2 for a length t of 3,2■ or more, an output is obtained from the AND element 50, and this signal is output. AND condition t-AND of 7 lips 70 tubes 47 and the cutting mark signal which is the output of the bulge 51. When the cutting mark signal is output, the 7 lip-flop 47i is reset. 52, 53, and 54 are for reset signals for the 7-lip flop 47 in the case where the photoelectronic switch 20 detects a stain or the like on the sheet 1, but the photoelectronic switch 21 does not detect it, and in the next case. In this example, the cut mark signal is transmitted by the mark width confirmation detection length of the optoelectronic switch 21, that is, (8-'1)""'X
O, 4--2, 8- Delay delay is always constant, so in a cutting device for plate-shaped materials such as cardboard sheets, cutting is performed from the cutting mark signal transmission point of optoelectronic switch 20.21. Distance to end A 111L (see Figure 10)
This can be dealt with by changing the . FIG. 16 is a timing chart at this time. Furthermore, only one optoelectronic switch 20 in FIG.
A detection signal control device 19 that outputs a cutting mark signal only when a certain set cutting mark width or more is detected continuously.
FIG. In addition, in the present invention, it is also possible to provide a photoelectronic switch t-311. That is, it is also possible to install two or more optoelectronic switches. Further, in the cutting mark detection signal control device, the cutting mark tracking function can be achieved by using other IC elements (such as a counter element) instead of the shift register. However, using a shift register has the following advantages. When using a shift register, unlike a normal counter, it can be tracked continuously even when the signal is detected by a photoelectronic switch, such as a pulse train. C,
There is no limit to the detection of friend cutting marks that do not require reset IIh operation. That is, if an opto-electronic switch detects a stain on a sheet and while tracking this signal the opto-electronic switch detects a cut mark, this cut mark number can also be tracked. As specifically explained in the embodiments and -9 above, according to the present invention, the heavy optoelectronic switch is installed offset in the width direction of the sheet, which is a plate-like material, so that the ,cb
Stains and printing stains on the sheet within the range indicated by IK (those present in the shaded area in the figure) are not detected. In other words, the width direction of the sheet (
If the two optoelectronic switches do not detect it in the direction of the optoelectronic switch spacing f, it is possible to detect erroneous stains or print stains on sheets of unlimited size and range in the direction of sheet execution. This can be avoided, and detection can be performed with high accuracy. Furthermore, since it has a tracking function for cutting marks detected upstream, it is possible to install two optoelectronic switches offset in the sheet flow direction (execution direction) regardless of the width of the i-fold. There is no limit to the external dimensions of the switch, and the distance e between the sheets of the two optoelectronic switches in the flow direction can be arbitrarily selected.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a cutting device for plate-shaped materials according to the prior art, Fig. 2 is a plan view showing a sheet with cutting marks superimposed thereon, which is a plate-shaped material to be cut by the cutting device, and Fig. 3 , Fig. 4-) and Fig. 5 (al is an explanatory diagram for explaining the cutting mark detection force formula according to the prior art, Fig. 3, Fig. 6), Fig. 4
FIG.
6, 7, 8, and 9 are plan views showing a sheet with cutting marks attached to explain the drawbacks of the detection method, and FIG. 10 is a plan view showing a sheet having an embodiment of the present invention. The schematic diagram showing the material cutting device'ft shows the positional relationship between the spot of the optoelectronic switch and the sheet. Plan view shown, 1st
FIG. 2 is a block diagram showing the detection gear signal control device t according to the first embodiment of the present invention, and FIG. 13 is a block diagram showing its operation frI5i.
! For clarity, FIG. 14 is a plan view showing the positional relationship between the spot and the sheet of the photoelectronic switch, FIG. 14 is a timing chart of the device shown in FIG. 12, and FIG. The block diagram shown in FIG. 16 is y, >7...permitted. In the drawing, 1 is 7-t (plate material χ 2 is a cutting mark, 14&i pulse transmitter, 19 is a detection signal control device, 20.21 is a photoelectronic switch, 22.23 is a spot, 24 to 31, 34, 35.36 to 45 and 48.49 are shift registers, 32.46 is a setting device, and 33.51 is an AND element. Figure 13 (0) Figure 3 (b) Figure 5 (b) @6r' 7J Figure 7

Claims (1)

[Claims] A cutting mark attached to a continuously traveling plate-shaped material. In the cutting device, one front light distribution electronic switch is arranged staggered in the running direction and width direction of the plate material, and the detection signal of the first optoelectronic switch is tracked to the position of the next optoelectronic switch to detect both. 1. A cutting edge detection device for a plate-shaped material cutting device K, characterized in that it has a detection signal control device that sends out a detection signal of the cutting mark only when the signals overlap.