JPS6357457A - Feed position monitor device for worksheet - Google Patents

Abstract

PURPOSE:To monitor the feed condition of a sheet precisely and quickly in a non-contact way by monitoring the contact of the leading end of the sheet with each top gauge in such a way on the basis of values measured with photo sensors fixed near each top gauge. CONSTITUTION:Photo sensors 10 and 20 are separately arranged, corresponding to the neighborhood of each top gauge TG1 and TG2 in order to measure a distance from the predetermined reference face of the leading end of a sheet ST via the projection of a pertinent beam of light toward said leading end and on the basis of the reflection of the projected light or the reduced quantity of transmitted light. And on the basis of values measured with the photo sensors 10 and 20, the contact condition of the leading end of the sheet ST with each of the top gauges TG1 and TG2 is monitored in a non-contact way. For the worksheet ST to be fed to a processing machine such as a printing machine, the feed condition thereof can be monitored precisely and quickly in a completely non-contact way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] This invention provides a method for automatically and continuously supplying a workpiece sheet made of a metal plate or the like to a printing machine or other various processing machines at high speed immediately before the supply. The present invention relates to a supply position monitoring device for a processed sheet, which detects the orientation of the same sheet and its deviation due to positional deviation and monitors its quality.

[Prior Art] Taking an example of the above-mentioned processing machine, a $1 machine is shown in FIG. 10, and its structure is shown in FIG.

That is, in FIG. 10, PC is a plate cylinder to which ink is applied corresponding to the desired image to be printed, and BC is
The blanket cylinder, IC, to which the desired print image is transferred as the plate cylinder PC rotates in the direction of arrow F1 in the figure and itself rotates in the direction of arrow F2 in the figure,
Based on the rotation of the blanket cylinder BC in the direction of the arrow F3 in the figure, which is further synchronized with the rotation of the blanket cylinder BC in the direction of the arrow F2, 88 pieces of sheets to be processed (printed) transported as shown by the arrow F4 are pressed against the blanket cylinder BC. The impression cylinder TG, which further transfers (prints) the image transferred thereto onto the sheet ST, is appropriately pivoted in the groove portion of the impression cylinder IC as shown in the figure, so as to meet the contact reference of the sheet ST. (forming a surface and forming a pair on the left and right when viewed from the cylinder plane direction), based on the abutting engagement with the front end of the sheet ST, the sheet S
A top gauge is shown which functions to hold the T in its mouth and supply it to the abutment marking machine 9j.

FIG. 11 shows an enlarged view of the top gauge TG portion of such a printing screen.

As shown in FIG. 11, the top gauge TG includes a front block 1 for bringing the sheet ST conveyed as indicated by an arrow F4 into contact with a reference position, and a presser claw 2 for pressing the sheet ST. Further, the impression cylinder IC has a claw stand 3 at a portion facing the presser claw 2 of the top gauge TG. That is,
After the sheet S1- is conveyed as indicated by the arrow F4, it is aligned by coming into contact with the front block 1 of the top gauge TG, and further held between the presser pawl 2 and the pawl base 3. The mark 11 is drawn in as shown by arrow F4.
[Supplied to 1. After the sheet ST is supplied to the printing press, the above-mentioned clamping is released by rotating the top gauge TG in the direction of arrow F5 in the figure about the shaft 4, and the sheet ST is transferred to the above-mentioned blanket. Based on the rotation of the cylinder BC and the impression cylinder IC in the directions of the arrows El]F2 and F3 (see FIG. 10), the cylinders advance in the direction of the arrow F4 while performing the required printing.

By the way, when precise printing is required, such as when performing multicolor printing on the sheet ST, variations in the relative position between the sheets I to ST and the printing machine lead to poor quality and defective products. Therefore, alignment of the supply position of the sheet ST by the above-mentioned top gauge TG is also extremely important. For example, when performing multicolor printing, if the sheet ST is fed in a bad condition such as skewed, it may cause color blurring, color shift, etc. due to variations in the printing screen, and in severe cases, polymerization interference may occur. This also causes a discoloration phenomenon, resulting in so-called misregistration, resulting in a defective product. Therefore, it is necessary to carefully manage the supply position of the S1-ST.

Here, conventionally, sheet S using such a top gauge TG
As a device for monitoring the supply position of T and detecting misregistration when it occurs, the name "Registration detection device for metal plate rotary printing press" devised in Utility Model Application No. 59-110632 was proposed R. There is.

That is, this device is placed in a standby position between the pair of top gauges, protruding forward from the contact reference surface of the top gauges by the pressure of a spring, and is placed in a waiting position between the pair of top gauges.
A pair of measuring members move backward when the front ends of the measuring members come into contact with each other, and the backward movement of this measuring member t! A sensor device that detects I-hanging with electrical output, and a sensor device that detects the amount of backward movement of each measuring member by the sensor device, as well as a metal plate (
Based on the electrical detection of the state of contact of the sheet ST) with each top gauge, the quality of the balls supplied to the printing machine of the same metal plate is monitored.

[Problems to be Solved by the Invention] It is true that the sheet feeding position and its manner can be monitored to some extent by such a device, but in the case of this device, as mentioned above, the sheet is held in the protruding position due to the compression of the spring. Since the position of the sheet is detected by the sheet coming into contact with the measuring member, a) the measuring member bounces each time the sheet comes into contact with the measuring member.

(1) Electrically, a plurality of peak values of the same level are generated each time the measuring member bounces, and the detection signal of the sensor device becomes unstable.

c) Due to the reasons mentioned above, it is difficult to determine the measurement timing.

There were other problems, and there were still concerns about its use in high-speed aircraft.

The present invention aims to solve these problems and provide a monitor device that is sufficiently practical even when adopted in high-intensity and high-speed machines.

[Means for Solving the Problems] In the present invention, an appropriate light beam is projected onto the front end of the sheet, and the sheet is adjusted based on the amount of reflected light or transmitted light of the projected light. Optical sensors that measure the distance from a predetermined reference plane of the front end of the sheet are separately fixed in correspondence with each vicinity of the top gauge, and each of the tops of the front end of the sheet is measured in a non-contact manner based on the measured values by these optical sensors. The manner of contact with the gauge is monitored.

[Effect 1] Using such an optical sensor, there is no contact with the sheet at all.
By monitoring the feeding mode of the sheet and the bad balls that come into contact with each top gauge, the above-mentioned conventional device
Problem c) will be fundamentally resolved.

[Embodiment] FIGS. 1 to 7 show an embodiment of a supply position monitoring device according to the present invention. In this embodiment as well, the processing machine is assumed to be marked @, and in these Figs. 1 to 7, the same parts as those shown in Figs. Indicated with a code.

FIG. 1 schematically shows the overall configuration of the monitor device of this embodiment when the impression cylinder IC shown in FIG. 10 is viewed from above. The sheet ST, which is supposed to be conveyed as shown by the arrow F4, is rotated in the direction of the impression cylinder IC1, and the sheet ST is conveyed as shown by the arrow F4. Top gauges TG1 and TG2 are supported to form a contact reference surface (supply reference position @) of the sheet ST, and are supplied for each printing based on the above-described contact engagement with the front end of the sheet ST. On the other hand, the monitor device of this embodiment emits straight light to the front end of the sheet ST which is disposed near each of the top gauges TG1 and TG2 as shown in the figure and comes into contact with them. The reflected light from the sheet ST of the projected light is received, and based on the amount of received light, a predetermined reference plane (here, the sheet supply reference position (-the contact reference plane of the top gauge TG1° TG2) of the front end of the sheet ST is detected). ) first and second optical sensors 10 and 20 . An output circuit 30 and an impression cylinder I perform necessary processing to be described later in order to output the received light outputs of these optical sensors 10 and 20 to the outside.
A connection terminal between terminals a1 and a2, between terminals a1 and a2, and between terminals a1 and a2, for taking out the electrical signals of these optical sensors 10, 20 and output circuit 30 arranged in C, and supplying power to the sensors and the output circuit from the outside. The desired machine timing of the printing press is determined through the electric circuit 40, for example, a cam attached to the rotation shaft of the impression cylinder IC, between the terminals 40 and 40, which are connected to each other by slip rings between cl and c2 to establish electrical continuity. (Here, especially sheet S
T is top gauge TG1. a machine timing sensor 50 that detects the standard timing (standard timing when it comes into contact with TG2), and the above-mentioned optical sensors 10, 20 of the impression cylinder IC through terminals c2-c1 of the conductive circuit 40.
And the output circuit 30 is supplied with the required power of +V, and the terminals al-a2 and bl-b of the conductive circuit 40 are
The light reception output of the optical sensors 10i and 20 taken out through 2 (more precisely, this processing output by the output circuit 30) Sl
and S2, the machine timing sensor 5
A signal M indicating a predetermined machine timing output from 0
Each of the apparatuses includes a determining device 60 that determines the suitability of these sensor outputs S1 and S2 based on T, that is, the suitability of the feeding mode of the sheet ST. The discrimination results by the discrimination device 60 or the sensor outputs S1 and S2 based on the light reception outputs of the optical sensors 10 and 20 are transferred to a printer (not shown) and recorded as appropriate, together with, for example, time data, as operation data of the monitor device. , and if it is determined that there is an abnormality as a result of the same determination,
It is assumed that a determination signal to that effect (misregistration detection signal @) is output each time as a signal instructing an alarm device or a jet device (not shown) to drive an alarm device or a signal instructing the printing sheet paste jet.

Next, referring to FIGS. 2 to 6, the optical sensor 10
and 20 and its structure will be explained in detail.

Figure 2 shows the impression cylinder IC from the side (
Top gauge TG when viewed from the axial direction of the same cylinder
1 (or TG2), sheet ST and optical sensor 10 (
t or 20) and the same cylinder IC are shown in an enlarged manner.

As shown in FIG. 2, the optical sensor 10 (or 20)
is fixed in the groove of the impression cylinder IC so that the projected light and the reflected light from the eight sheets (broken line arrows indicated by the symbol LB) are substantially perpendicular to the sheet ST when viewed from the side.

3 and 4 are front and side views, respectively, of such optical sensor 10 (or 20).

As shown in these figures, the optical sensor 10 (optical sensor 20
The same applies to the optical sensor 10 (for convenience, only the optical sensor 10 will be explained here).
A lens 12 that collects this emitted light and projects it onto one side of the front end of the sheet ST, two types of light receiving optical fibers 13a that receive and transmit the reflected light from the sheet ST, and 13b1 Light receiving elements D11 and D12 (referred to as D21 and D22 in the optical sensor 20) consisting of two photodiodes, etc. that separately receive the light transmitted through these optical fibers 13a and 13b, and light receiving by these light receiving elements D11 and D12. Each has a built-in head amplifier 14 that appropriately amplifies and stabilizes the output. Further, in the figure, 15 is a cable for inputting and outputting electrical signals, and 16 is a mounting hole for mounting the optical sensor 10 on the impression cylinder IC (see FIG. 2).

Here, the above two types of light receiving optical fibers 13a and 13
b is an optical fiber in which the first optical fiber 13a is positioned such that its light-receiving surface corresponds to the position of the predetermined reference plane of the front end of the sheet t-8T, and receives and transmits reflected light from the sheet ST. and the second optical fiber 13
b is an optical fiber whose light-receiving surface is positioned rearward in the transport direction F4 of the sheet ST than the light-receiving surface of the first optical fiber 13a, and which receives and transmits the reflected light from the sheet ST; Fibers 13a and 13
As shown in FIG. 5, the relationship between the light-receiving surfaces b is set as . Incidentally, it is assumed that the dimensions of these light-receiving surfaces are set approximately. The reason and function of using these two types of optical fibers 13a and 13b will be explained in detail later with reference to FIG. 7. Further, as shown in FIG. 6, the head amplifier 14 is a parallel circuit that corresponds to the two light receiving elements (photodiodes) Dll and DI2, respectively, and the head amplifier 14 is connected to the amplifier 1, respectively.
The light receiving outputs of these light receiving elements D11 and D12 are individually amplified and output through 41 and 142.

Now, FIG. 7 shows the relationship between the carry-in sheet ST and the optical sensors 10 and 20 (especially the light-receiving fibers 13a, 13b and 23a, 23b) of the monitor device of this embodiment,
Also, specific configuration examples of the output circuit 30 and the discrimination device 60 are shown, and the functions and operations of this embodiment monitor device will be described in detail below with reference to FIG. 7 at the same time.

As shown in FIG. 7, and as described above, in the direction F4 in which the sheet ST is carried into the printing rack and into the monitoring device, each optical sensor 10 and two
0 first light receiving optical fibers 13a and 23a are arranged, and behind the same, second light receiving optical fibers 13b and 23b of these optical sensors are arranged, and light is emitted from the respective light emitting means 11 and 21. Since the light reflected by the light sheet ST is received by these optical fibers 13a, 13b and 23a, 23b, for example, in the case of one optical sensor 10, the first optical fiber 13a receives the light reflected by the sheet ST. Whenever light is received, the same reflected light is also received by the second optical fiber 13b. The same applies to the optical sensor 20 used.

Under these circumstances, this embodiment monitor device C:
The output circuit 30 is provided with dividers 31 and 32, and the light receiving elements D11 and D21 (FIG. 3,
(see Figures 4 and 6) (more precisely, this amplified output by amplifiers 141 and 241) is
The light receiving elements D12 and D22 of the reflected light received and transmitted through the optical fibers 13b and 23b (Figs. 3 and 4)
and FIG. 6)) (more precisely, this amplified output by the amplifiers 142 and 242). That is, in the divider 31, the light reception output regarding the first light receiving element D11 through the first optical fiber 13a of the optical sensor 10 is divided into A1 and both optical sensors 'J.
When the light reception output of the second light receiving element D12 through the second optical fiber 13b of the IO is set to 81, Pf4m of Al/B1 is performed, and this calculated value (Al/B1) is used as the first sensor output. S1 is transmitted to the discrimination device 60 via the 4-electric circuit 40, and the divider 32 outputs the light received by the first light receiving element D21 through the first optical fiber 23a of the optical sensor 20 as A2, the same light. The second light receiving element D of the sensor 20 passes through the second optical fiber 23b.
If the received light output for 22 is 82, perform the dance A 2 / B 2 and get this calculated value (A 2 / B 2 )
is similarly transmitted to the discrimination Htif 60 via the conductive circuit 40 as the second sensor output S2. As a result, both of the first and second sensor outputs S1 and B2 have the following effects: 1) The influence on the detection content due to the change in the light amount of the light emitting elements 11 and 21 made of LEDs and the like.

2) Effects on detection contents due to differences in reflectance due to surface materials and material differences of Sea 88.

etc. were avoided @! The signal is inputted to the discrimination device 60 as a signal indicating the positional relationship between the light receiving surfaces ([phase] and @) of each of the first optical fibers 13a and 23a and the front end of the sheet ST.

As shown in FIG. 7, this discrimination device 60 determines the maximum allowable distance of the carried-in sheet ST from the supply reference position related to the top gauge TG1 (=the contact reference surface of the top gauge G1). Optical sensor 10 corresponding to distance
A first setting device 61, which is preset with a value equivalent to the first sensor output S1 indicating the positional relationship between the light receiving surface ([phase]) of the first optical fiber 13a and the front end of the sheet ST, is also carried in. The light receiving surface of the first optical fiber 23a of the optical sensor 2o corresponds to the maximum allowable distance from the supply reference position (-the contact reference surface of the top gauge TG2) of the sheet ST related to the top gauge TG2. A second setter 62 is preset with a value equivalent to the second sensor output S2 indicating the positional @ relationship between (@) and the same sheet STI section, and a predetermined machine timing (sheet The first sensor output S1 is compared with the setting value of the first setting device 61 in synchronization with a signal MT indicating the standard timing when ST comes into contact with the top gauges TG1 and TG2. When the value of the sensor output S1 falls beyond this set value, that is, when the sheet S T
a first comparator 63 that outputs a misregistration detection signal when the distance of the flit end from the contact reference surface of the top gauge TG1 (if it is in contact, this distance is rOJ) exceeds the maximum allowable distance; Similarly, the second sensor output S2 is compared with the setting value of the second setter 62 in synchronization with the signal MT indicating a predetermined machine timing output from the machine timing sensor 50, and the value of the second sensor output S2 is determined. falls beyond this set value, i.e. sheet ST
A second comparator 64 that outputs a misregistration detection signal when the distance from the contact reference surface of the top gauge TG2 at the front end exceeds the maximum allowable distance, and a second comparator 64 that outputs a misregistration detection signal, and the above-mentioned alarm device or directing device that outputs a misregistration detection signal. and a power supply circuit 66 for supplying power to the optical sensors 10, 20, the output circuit 30, and each of the above-mentioned elements in the discrimination device 60. Therefore, if the sheet ST is carried in in a normal manner as shown by the broken line in FIG. 1, the above-mentioned misregistration detection signal does not need to be output, but, for example, as shown by the solid line in FIG. If the sheet ST is brought in in an abnormally tilted state, a misregistration detection signal will be output from at least the first comparator 63 side, indicating that an abnormality has occurred in the feeding state of the sheet ST. Be monitored reliably and quickly. Note that, as described above, the output amplifier 65
The discrimination result of the discrimination device @60 via
If the second sensor outputs S1 and S2 are transferred to a printer (not shown) along with time data and recorded appropriately, it is easy to monitor the operating status of the monitoring device and the occurrence of misregistration. be able to manage it.

In this way, according to the monitor device of this embodiment, the sheet S
The feeding position of the sheet ST to the printing machine can always be accurately and quickly monitored without being affected by the material of the sheet ST.

In addition, in the above embodiment, each optical sensor 10 and 2
0, as shown in FIG. However, the area of the light receiving surface of each of these optical fibers has a certain relationship between the two optical sensors 10 and 20, and between the first optical fiber and the second optical fiber. The relationship is not limited to the one shown in FIG. 5 as long as it is maintained.

Furthermore, the configuration of the determining device 60 is not limited to the example shown in FIG. 7, but may be arbitrary, and determines whether or not the sheet ST feeding mode is appropriate based on the first and second sensor outputs S1 and S2 described above. It's fine as long as you can get it. Especially when the seat is 1m in a tilted state as shown by the solid line in Figure 1 above.
If you want to detect whether or not there is a person, the same detection can also be achieved by, for example, finding the difference between the sensor outputs S1 and S2, and determining whether this difference exceeds an allowable range. can.

In addition, in the same practice, a conductive circuit 40 using a slip ring connects the electric circuit (light sensor 10° 20 and output circuit 30) arranged inside the impression cylinder IC of print 1 and the external electric circuit (discriminator 60). Although electrical continuity is intended, wireless communication (ffi, etc.) may also be used, especially for the transmission of sensor outputs S1 and S2.

In this case, a battery or the like may be used as the power supply means.

Furthermore, in the same embodiment, the optical sensors 10 and 20 of the type that utilize light reflection by the sheet ST were used as the optical sensors, but other types of optical sensors such as those shown in FIGS. 8 and 9 may also be used. An optical sensor 7 of a type that receives transmitted light that is not blocked by eight light sheets and determines the distance of the front end of the sheet ST from a predetermined reference plane based on the amount of received light.
Of course, it is also possible to use 0 or 80. By the way, the 8th
The optical sensor 70 shown in the figure is of an integrated type with a light emitting and receiving element.
Reference numeral 1 indicates a light emitting (light emitting) element, 72 a lens, and 73 a light receiving element.The optical sensor 80 shown in FIG.
83 represents a lens, and 83 represents a light receiving element. These eighth
9 and 9, grooves provided in the presser claws 2 (2', 2'') of the top gauge TG are used as light reflecting means in both cases, but such grooves are separately provided. Of course, a means for light reflection may be provided.

[Effect of the invention 1] As explained above, according to the present invention, it is possible to accurately and quickly monitor the feed state of a sheet to be processed, which is fed to a processing machine such as a printing machine for 1 meter, without contacting it at all. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the general configuration of an embodiment of the liquid supply position monitoring device for liquid addition station 1 to 1 according to the present invention, and FIG. 3 is a front view of the optical sensor used in the same example, FIG. 4 is a side view of the optical sensor, FIG. 5 is a plan view showing the structure of the light receiving surface of the optical sensor, and FIG. A circuit diagram showing the head amplifier configuration of the optical sensor, FIG. 7 is a block diagram mainly showing a specific example of the electrical configuration of the same embodiment, and FIGS. 8 and 9 show other configurations of the optical sensor, respectively. A side view showing an example; FIG. 10 is a side view showing the outline of a rotary printing press;
FIG. 11 is an enlarged side view showing the top gauge portion of the jacket (marked in the same manner). 10.20, 70.80... Optical sensor, 13a. 13b, 23a, 23b... Optical fiber for light reception, 30
...Output circuit, 31.32...Eliminator, 40...
Conductive circuit, 50... Machine timing sensor, 60.
...Discrimination device. Tf3+ (orTG2) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 10 Figure 11

Claims (4)

[Claims] (1) When feeding the sheet to the processing machine while aligning it by bringing the front end of the sheet to be processed into contact with a pair of top gauges set in advance as a contact reference surface, In a feed position monitoring device for a processed sheet that monitors whether or not the front end of the sheet is in even contact with the pair of top gauges, reflected light or transmitted light projected onto the front end of the sheet is provided. Optical sensors that measure the distance of the front end of the sheet from a predetermined reference plane based on the amount of light received are installed separately in the vicinity of the top gauge, and non-contact measurement is performed based on the measured values by these optical sensors. A supply position monitoring device for a processed sheet, characterized in that the state of contact of the front end of the sheet with each of the top gauges is monitored. (2) The optical sensor includes: a light projecting means that directly projects light in one direction at the front end of the sheet; and a light projecting means arranged at a position of the front end of the sheet corresponding to the predetermined reference plane. a first light receiving means for receiving the reflected light of the projected light from the sheet surface; each comprising second light receiving means for receiving reflected light from the sheet surface, and calculating means for calculating the ratio of the light receiving output of the first light receiving means and the light receiving output of the second light receiving means, A feed position monitoring device for a processed sheet according to claim 1, wherein the distance of the front end of the sheet from a predetermined reference plane is measured based on the calculation output of the calculation means. (3) When the light-receiving area of the first light-receiving means is A, and the light-receiving area of the second light-receiving means is B, the relationship between these light-receiving areas is A>>B. ) The feed position monitoring device for the processed sheet described in item 2. (4) The top gauge has a reflective groove in a part facing the front end of the sheet, and the optical sensor is indirectly connected to one side of the front end of the sheet through the reflective groove of the top gauge. light projecting means for projecting light onto the front end of the sheet; and light receiving means for receiving transmitted light of the projected light that is not blocked by the sheet and is disposed corresponding to the position of the predetermined reference plane on the front end of the sheet. A feed position monitoring device for a processed sheet according to claim 1, which measures the distance of the front end of the sheet from a predetermined reference plane based on the light receiving output of the light receiving means. .