JPH0679945B2 - Supply position monitoring device for processed sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to automatic continuous high-speed supply of a processed sheet made of a metal plate or the like to a printing machine or other various processing machines, immediately before the supply thereof. The present invention relates to a sheet supply position monitoring device for a sheet to be processed, which detects a deviation due to the direction and position deviation of the sheet each time and monitors the quality of the deviation.

[Prior Art] A printing machine is taken as an example of the above-mentioned processing machine, and its general structure is shown in FIG.

That is, in FIG. 10, PC is a plate cylinder to which ink is applied corresponding to a desired image to be printed, BC is rotation of the plate cylinder PC in the direction of arrow F1 in the figure and rotation of itself in the direction of arrow F2 in the figure. The blanket cylinder and the IC to which the desired image to be printed are transferred along with are conveyed as shown by arrow F4 based on the rotation of the blanket cylinder BC in the direction of arrow F2, which is further synchronized with the rotation of the blanket cylinder BC in the direction of arrow F3. An impression cylinder for transferring (printing) the image transferred onto the sheet ST to be processed (printing) sheet ST to the blanket cylinder BC while pressing (TG) the groove portion of the impression cylinder IC. As shown in the figure, the seat ST is appropriately supported to form a contact reference surface of the seat ST (which makes a pair on the left and right when viewed from the cylinder plane direction). Shows part and abutting engagement based on if the top gauge which serves to supply it while applying the sheet ST to contact the printing machine respectively.

FIG. 11 is an enlarged view of the top gauge TG portion of the printing machine.

As shown in FIG. 11, the top gauge TG has an arrow F4.
It has a front contact block 1 for abutting the sheet ST conveyed as described above at a reference position, and a pressing claw 2 for pressing the sheet ST, and the impression cylinder IC is the top gauge. A claw base 3 is provided at a portion facing the pressing claw 2 of the TG. That is, the above sheet
After the ST is transported as shown by arrow F4, the ST is brought into contact with the front contact block 1 of the top gauge TG for alignment, and is further sandwiched between the presser pawl 2 and the pawl base 3 and further arrowed.
It is pulled in like F4 and supplied to the printing machine. In addition,
After the sheet ST is supplied to the printing machine in this way, the above-mentioned clamping is released by the rotation of the top gauge TG in the direction of the arrow F5 around the axis 4 of the top gauge TG. And the impression cylinder IC rotate in the directions of the arrows F2 and F3 (see FIG. 10), respectively, while the required printing is performed and the process proceeds in the direction of the arrow F4.

By the way, when precise printing is required such as when performing multi-color printing on the above-mentioned sheet ST, the variation in the relative position between the sheet ST and the printing machine immediately leads to poor quality and leads to defective products. , Seat ST with the above-mentioned top gauge TG
It is also extremely important to adjust the supply position of For example, in the construction of multicolor printing, when the sheet ST is fed into the printing machine in a bad condition such as skewing, it causes color blurring due to variations in the printing screen, color misregistration, etc. Discoloration also occurs, leading to so-called misregistration, resulting in a defective product. Therefore, the supply position alignment of the sheet ST needs to be sufficiently managed.

Heretofore, as a device for monitoring the supply position of the sheet ST by such a top gauge TG and detecting the misregistration when it occurs, the name of the invention “in a metal plate rotary printing press” A misregistration detection device has been proposed.

That is, this device projects between the pair of top gauges by a spring pressure to move forward from the contact reference surface of the top gauges to a standby position, and is retracted by the front end of the carry-in metal plate (sheet ST) contacting. The measuring device comprises a pair of moving measuring members, and a sensor device for detecting the backward movement amount of the measuring member by an electric output. The backward movement amount of each of the measuring members by the sensor device, that is, a carried-in metal plate (sheet).
The quality of the supply mode of the metal plate to the printing machine is monitored based on the electric detection of the contact mode of each top gauge of ST).

[Problems to be Solved by the Invention] Although it is possible to monitor the sheet feeding position and its mode to some extent even with such an apparatus, in the case of this apparatus, as described above, the sheet is placed in a stand-by state by being pressed by the spring. Since the position of the sheet is detected by the contact of the sheet with the existing measuring member, a) the measuring member bounces each time the sheet comes into contact with the measuring member.

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

C) It is difficult to set the measurement timing because of the above b) and b).

There were problems such as these, and it was still uneasy to adopt it for high-speed machines.

The present invention is intended to solve such problems and to provide a monitor device which is highly accurate and can be sufficiently put to practical use even when it is adopted in a high-speed machine.

[Means for Solving Problems] In the present invention, an appropriate light beam is projected onto the front end portion of the sheet, and the sheet is based on the received light amount of the reflected light or the transmitted light of the projected light. An optical sensor for measuring the distance from the predetermined reference surface of the front end portion is separately fixed corresponding to each vicinity of the top gauge, and each top of the front end portion of the sheet is contactlessly based on the measurement value by these optical sensors. The contact mode with the gauge is monitored.

[Operation] By using such an optical sensor to monitor the supply mode of the sheet, that is, the contact mode with respect to each top gauge, in a completely non-contact manner with the sheet, the above-mentioned conventional device a) to
The problem of c) is 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, a printing machine is assumed as the processing machine, and in FIGS. 1 to 7, the same parts as those shown in FIGS. 10 and 11 are designated by the same reference numerals. Attached and shown.

FIG. 1 is a schematic diagram showing the overall construction of the embodiment monitor apparatus of the printing machine shown in FIG. 10, particularly the impression cylinder IC portion as seen from above, in the direction of arrow F3 as described above. The impression cylinder IC that rotates, the sheet ST that is conveyed to the impression cylinder IC in the direction of arrow F4, and the shaft portion of the impression cylinder IC that is paired with the groove portion (not shown) of the impression cylinder IC as appropriate. The top gauges TG ₁ and TG are formed to form a contact reference surface (supply reference position) of the sheet ST and to supply the contact reference surface (supply reference position) to the printing machine based on the aforementioned contact engagement with the front end portion of the sheet ST. to _2, this embodiment monitoring device, projecting the straight light against the front end of the seat ST, which is brought into contact with these arranged as shown in the vicinity of the top gauge TG ₁ and TG ₂ Rutotomoni, receives light reflected from the sheet ST of the projected the light, each predetermined reference surface of the sheet ST front end based on the amount of received light (the sheet supply reference position in this case (= top gauge TG _1, TG The first and second optical sensors 10 and 20 for measuring the distance from the contact reference surface ₂ ) and the light receiving outputs of these optical sensors 10 and 20 are externally output by the necessary processing described below. In order to output the electric signal of the output circuit 30, the optical sensor 10, 20 and the output circuit 30 arranged in the impression cylinder IC to the outside, or to supply power to the sensor and the output circuit from the outside, the terminal a1 -A2, b1-b2
, C1-c2 through a slip ring to electrically contact these terminals by a slip ring, for example, through a conductive circuit 40, such as a cam attached to the rotation shaft of the impression cylinder IC through the desired machine timing of the printing machine (here In particular, the machine timing sensor that detects the standard timing when the seat ST contacts the top gauges TG ₁ and TG _2.
50, and through the terminals c2-c1 of the conductive circuit 40, the above-mentioned photosensors 10, 20 of the impression cylinder IC and the output circuit 30 are supplied with the required power of + V, and the terminals a1-a2 and b1- Received light output of photosensors 10 and 20 taken out through b2 (to be exact, output circuit
This processing output by 30) S1 and S2 are received, and based on the signal MT indicating the predetermined machine timing output from the machine timing sensor 50, the suitability of these sensor outputs S1 and S2, that is, the suitability of the sheet ST supply mode It is configured to include a determination device 60 for determining The discrimination result by the discrimination device 60 or the optical sensors 10 and 20
When the sensor outputs S1 and S2 based on the received light output of are transferred to a printer (not shown) together with the time data at any time as operation data of the monitor device and appropriately recorded, and as a result of the determination, it is determined that there is an abnormality. In each case, a determination signal (registration detection signal) to that effect is output each time as a signal for instructing an alarm device or a reject device (not shown) to drive the alarm device or a signal for instructing the rejection of the print sheet.

Next, with reference to FIG. 2 to FIG. 6, a detailed description will be given of the arrangement of the photosensors 10 and 20 and the structure thereof.

Fig. 2 shows the top gauge TG when the impression cylinder IC is viewed from the side (from the axial direction of the cylinder).
₁ (or TG ₂ ), the sheet ST, the optical sensor 10 (or 20), and the same cylinder IC are enlarged and shown.

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

3 and 4 show such an optical sensor 10 (or 2
0) is a front view and a side view, respectively.

As shown in these drawings, the same applies to the optical sensor 10 (optical sensor 20), and here, for convenience, only the optical sensor 10 will be described). Lens 12 for projecting light on one surface of the front end portion of the sheet ST, and two types of light receiving optical fibers 13a and 13b for receiving and transmitting reflected light from the sheet ST of the projected light,
A light receiving element D ₁₁ composed of two photodiodes or the like for individually receiving the light transmitted through the optical fibers 13a and 13b.
And D ₁₂ (denoted as D ₂₁ and D _{22 in the} optical sensor 20), and a head amplifier 14 that appropriately amplifies the received light output of these light receiving elements D ₁₁ and D ₁₂ and stabilizes it. Further, in the figure, 15 is a cable for inputting / outputting an electric signal, and 16 is a mounting hole of the optical sensor 10 to the impression cylinder IC (see FIG. 2).

Here, the two types of light-receiving optical fibers 13a and 13b are
The first optical fiber 13a is an optical fiber that is positioned so that its light-receiving surface corresponds to the position of the front end of the sheet ST serving as the predetermined reference surface, and receives and transmits the reflected light from the sheet ST. The second optical fiber 13b is an optical fiber whose light-receiving surface is positioned rearward of the light-receiving surface of the first optical fiber 13a in the transport direction F4 of the sheet ST and receives and transmits the reflected light from the sheet ST. As shown in FIG. 5, the relationship between the light-receiving surfaces of the two optical fibers 13a and 13b is set to >> when the light-receiving areas of these are respectively set to and. By the way, the dimensions of these light receiving surfaces are It is supposed to be set to about. The reason and function of using these two types of optical fibers 13a and 13b will be described later in detail with reference to FIG. Further, as shown in FIG. 6, the head amplifier 14 is a parallel circuit corresponding to the two light receiving elements (photodiodes) D ₁₁ and D ₁₂ , respectively.
Through 42, the light receiving outputs of these light receiving elements D ₁₁ and D ₁₂ are individually amplified and output.

Now, FIG. 7 shows the carrying-in sheet ST and the optical sensors 10 and 20 (especially the light-receiving fiber 13) of such a monitor apparatus.
a, 13bc and 23a, 23b) and the output circuit 3
0 and a specific configuration example of the discriminating apparatus 60 are shown below, and the function and operation of the monitor apparatus of this embodiment will be described in detail with reference to FIG. 7 at the same time.

As shown in FIG. 7 and as described above, with respect to the carrying-in direction F4 of the sheet ST to the printing machine and to the monitoring device, the first of the optical sensors 10 and 20 is set to the far side.
The light receiving optical fibers 13a and 23a are arranged, and the second light receiving optical fibers 13b and 23b of these optical sensors are also arranged in the rear thereof, and the sheet ST of the light emitted from the respective light emitting means 11 and 21. The reflected light from the sheet ST is received by the optical fibers 13a, 13b and 23a, 23b, respectively. Therefore, for example, regarding the one optical sensor 10, when the reflected light from the sheet ST is received by the first optical fiber 13a. The same reflected light is always received by the second optical fiber 13b. The same applies to the other optical sensor 20.

Under these circumstances, in the monitor device of this embodiment,
The output circuit 30 is provided with dividers 31 and 32, and light receiving elements D ₁₁ and D _{21 for} reflected light received and transmitted through the first optical fibers 13a and 23a, respectively (see FIGS. 3, 4, and 6). The received light output (accurately, this amplified output by the amplifiers 141 and 241) by the second optical fibers 13b and 23b
Light receiving elements D ₁₂ and D _{22 for} reflected light received and transmitted through
The division is made by the received light output (to be exact, this amplified output by the amplifiers 142 and 242) by (see FIGS. 3, 4, and 6). That is, in the divider 31, the light receiving output of the _first light receiving element D ₁₁ of the optical sensor 10 through the first optical fiber 13a is A ₁ ,
Second light receiving element D ₁₂ through the second optical fiber 13b of
When the received light output for B1 is B1, a calculation of A1 / B1 is performed, and the calculated value (A1 / B1) is transmitted to the discriminating device 60 via the conductive circuit 40 as the first sensor output S1, and In the divider 32, the light receiving output of the first light receiving element D ₂₁ through the first optical fiber 23a of the optical sensor 20 is A2, and the second light receiving element through the second optical fiber 23b of the same optical sensor 20 is When the light receiving output for D ₂₂ is B2, the calculation of A2 / B2 is performed, and the calculated value (A2 / B2) is used as the second sensor output S2 through the conductive circuit 40 in the same manner as the discrimination device.
Transmit to 60. As a result, the first and second sensor outputs S1 and S2 are both: 1) Influence on the detection content due to the light amount change of the light emitting elements 11 and 21 including LEDs and the like.

2) The influence on the detection content due to the difference in the reflectance due to the surface material of the sheet ST and the material difference.

Etc. avoiding purely each first optical fiber 13a and 23a
Light-receiving surface of Is input to the discriminating device 60 as a signal indicating the positional relationship between the front end portion of the sheet ST and the sheet ST.

As shown in FIG. 7, the discriminating device 60 is provided with a carry-in sheet.
Supply reference position related to the top gauge TG ₁ of ST (=
The _first distance of the optical sensor 10 that allows the maximum distance from the top gauge TG ₁ (contact reference surface)
Light receiving surface of optical fiber 13a Of the first sensor output S1 indicating the positional relationship between the first seat 61 and the front end of the seat ST, and a supply reference position (=) related to the top gauge TG ₂ of the carry-in seat ST (= The first light receiving surface of the first optical fiber 23a of the optical sensor 20 corresponding to the maximum allowable distance from the abutment reference surface of the top gauge TG ₂ ) And a predetermined machine timing output from the machine timing sensor 50 (the seat ST is the top position), which is preset with an equivalent value of the second sensor output S2 indicating the positional relationship between the seat ST and the front end portion of the seat ST. The first sensor output S1 and the set value of the first setter 61 are compared in synchronism with a signal MT indicating a standard timing of contacting the gauges TG ₁ and TG ₂ ), and, for example, the first sensor output When the value of S1 drops below this set value, that is, the distance from the top gauge TG ₁ contact reference surface of the front end of the seat ST (this distance is "0" if in contact).
A first comparator 63 that outputs a misregistration detection signal when the distance exceeds the maximum allowable distance, and the above-mentioned first comparator 63 that is output from the machine timing sensor 50 in synchronization with the signal MT. The second sensor output S2 is compared with the setting value of the second setting device 62.
When the value of falls below this set value, that is, the sheet
The second comparator 64 that outputs a registration error detection signal when the distance from the abutting reference surface of the top gauge TG _{2 at} the ST front end exceeds the maximum allowable distance. An output amplifier 65 for transmitting to the reject device, and a power supply circuit 66 for supplying power to the photosensors 10, 20 and the output circuit 30 and each of the above elements in the discriminating device 60 are provided. Therefore,
The seat ST is in the normal manner as shown by the broken line in FIG. 1 above.
If the sheet ST is conveyed, the misregistration detection signal does not have to be output. However, for example, when the sheet ST is conveyed in an abnormally inclined state as shown by the solid line in FIG. Since the 1-comparator 63 side outputs a misregistration detection signal, it can be reliably and promptly monitored that an abnormality has occurred in the supply mode of the sheet ST. As described above, the determination result of the determination device 60 via the output amplifier 65, or the first and second sensor outputs S1 and S2 are transferred to a printer (not shown) together with the time data at any time. By appropriately recording this, it becomes possible to easily manage the operating status of the monitor device and the occurrence of misregistration.

Thus, according to the monitor device of this embodiment, the seat ST
The supply position of the sheet ST to the printing machine can always be monitored accurately and promptly without being affected by the material of the sheet.

In each of the optical sensors 10 and 20 in the above embodiment, the first light receiving optical fiber (13a or 23a) and the second light receiving optical fiber (13b or 23b) are provided as shown in FIG. The area of the light receiving surface of the optical fiber is positively made different as described above, but the area of the light receiving surface of each of these optical fibers is different between the two optical sensors 10 and 20 and that of the first optical fiber. It suffices that a certain relationship be maintained between the second optical fiber and the second optical fiber, and the relationship is not particularly limited to that shown in FIG.

Further, the configuration of the discriminating device 60 is not limited to the example shown in FIG. 7 and is arbitrary, and discriminating the suitability of the sheet ST supply mode based on the above-mentioned first and second sensor outputs S1 and S2. Anything can be done. In particular, if it is necessary to detect whether or not a sheet has been carried in in an inclined state as shown by the solid line in FIG. 1, the difference between the sensor outputs S1 and S2, for example, can be obtained and this difference can be tolerated. The same detection can be achieved by determining whether or not the range is exceeded.

Further, in the same embodiment, the conductive circuit 40 by the slip ring is used.
The electrical circuit (optical sensors 10, 20 and output circuit 30) arranged in the impression cylinder IC of the printing machine is electrically connected to the electrical circuit (discriminating device 60) outside thereof by the sensor output S1 and Other wireless communication can be used for S2 transmission. In this case, a battery or the like may be used as the power feeding means.

Further, in the embodiment, as the optical sensor, the optical sensors 10 and 20 of the type utilizing the light reflection by the sheet ST are used, but in addition to this, the light is projected as shown in FIGS. 8 and 9, for example. It is of course possible to use a type of optical sensor 70 or 80 that receives the transmitted light that is not blocked by the light sheet ST and grasps the distance from the predetermined reference surface of the front end cormorant of the same sheet ST based on the amount of the received light. is there. Incidentally, an optical sensor 70 shown in FIG. 8 is of a type integrated with a light emitting / receiving element, 71 is a light emitting (light emitting) element, 72 is a lens, 73 is a light receiving element, and the optical sensor 80 shown in FIG. Is a light emitting and receiving element separated type.
Is a light emitting (light emitting) element, 82 is a lens, and 83 is a light receiving element. 8 and 9, in any case, the pressing claw 2 of the top gauge TG is used as the light reflecting means.
Although the grooves provided in (2 ′, 2 ″) are used as shown in the drawing, it is of course possible to separately provide such means for reflecting light.

[Effects of the Invention] As described above, according to the present invention, it is possible to accurately and promptly monitor the supply mode of a sheet to be processed that is carried into a processing machine such as a printing machine without any contact. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a sheet feeding position monitoring device according to the present invention, FIG. 2 is a side view showing an optical sensor mounting mode of the embodiment, and FIG. Is a front view of the optical sensor used in the embodiment, FIG. 4 is a side view of the optical sensor, FIG. 5 is a plan view showing a light receiving surface structure of the optical sensor, and FIG. 6 is a head amplifier of the optical sensor. FIG. 7 is a circuit diagram showing the configuration, FIG. 7 is a block diagram showing a concrete example of the electrical configuration of the embodiment, and FIG.
9 and 9 are side views showing another example of the configuration of the optical sensor, FIG. 10 is a side view showing the outline of a rotary printing press, and FIG.
The figure is an enlarged side view showing a top gauge portion of the printing machine. 10,20,70,80 ... Optical sensor, 13a, 13b, 23a, 23b ... Optical fiber for receiving light, 30 ... Output circuit, 31, 32 ... Divider, 40 ...
… Conductive circuit, 50 …… Machine timing sensor, 60 …… Discriminating device.

Claims (2)

[Claims] 1. A sheet to be processed is fed to the processing machine while the front end portion of the sheet to be processed sent to the processing machine is brought into contact with and engaged with a pair of top gauges set in advance as contact reference planes for alignment. At this time, in the feed position monitoring device for the sheet to be processed, which monitors whether or not the front end portion of the sheet evenly contacts the pair of top gauges, the front end portion of the sheet to be processed engaged with the top gauge is On the other hand, a light projecting means for projecting straight-ahead light, and a first light receiving means arranged corresponding to a position serving as the contact reference surface and receiving reflected light from the sheet surface of the projected light. A second light receiving means disposed rearward of the first light receiving means in the sheet feeding direction and receiving reflected light from the sheet surface of the projected light; Installed in the vicinity, the sheet is supplied to the processing machine. Each time each of the above is performed, the ratio of the light receiving outputs of the first and second light receiving means is separately calculated, and the contact mode of the front end portion of the sheet with each of the top gauges is monitored. Position monitor device. 2. A light receiving area of the first light receiving means is A,
When the light receiving area of the second light receiving means is B, the relationship of these light receiving areas is A >> B. The sheet feed position monitoring device according to claim (1).