JPH0442280Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pull gauge coupled to the drive of the machine, which applies a predetermined pulling motion to each incoming sheet, and It is based on a device for a sheet-fed rotary printing press, which is equipped with a sensor device for monitoring the edge position.

A known implementation on which the invention is based is an individual sheet feeder or a stream feeder type feeder. Alignment of the sheets, which is a prerequisite for registered printing, takes place in two directions on the feeder during transport. One is front edge alignment and the other is lateral alignment. A plurality of leading edges reliably determine the position of the leading edge of the sheet. Lateral alignment is often done with pull gauges.

The role of a pull gauge in a sheet-fed printing press is to pull the sheets fed in from the paper feeder laterally and to align them accurately. This alignment must be performed with particular precision. This is because if there is such an error, there will be a difference in the position of the ink on each printed paper. There is a sheet-fed printing press with a pull gauge known as DE-OS3011626A1. The sheets to be registered are forced into the mouth of the moving plate with the aid of a separating roller. A vacuum is used to accomplish the acceleration process, which overcomes the large adhesion/frictional forces that exist when the sheet is at rest, and then stops the suction of air so that the sheet is brought to the contact surface. They work in a time-regulated manner to prevent strong collisions.

Furthermore, German Utility Model No. 71 32 298 discloses a photoelectric device for monitoring the lateral position of the sheet feed position in a sheet-fed printing press. In this device, a reflective measuring device consists of two series, one photoelectric detector and one light source, fixed on a common support, each of which activates a separate alarm or machine stop device. They are placed on either side of the defined line on which the sheet lies, determined by the feed edge of the sheet. This support is arranged so that it can be adjusted about an axis perpendicular to the plane of sheet travel, which axis is located at the midpoint of the line connecting the defined line and the two reflection points. It passes through.
This device performs a check not only on the inside of the cover plate, but also on the sheets on the outside, taking into account the desired minimum deviation. However, this device uses two photocells, and the sheet is checked only after it has been pulled. That is, only the final position of the sheet is checked.

In the manufacturer's document ``Ultramann GS'', in ``Photoelectric sheet monitoring with Ga-As diodes at the feed position'', one method of sheet monitoring at the cover plate is developed. According to it,
A scanning system consisting of two reflective scanning heads is mounted below the paper tray. If the sheet is properly located at the back plate, the light beam will be reflected off the leading edge of the sheet, and the trailing edge of the preceding sheet will be pulled past the back plate by the front gripper. It will be done. If the sheet is introduced too slowly, light from the trailing edge of the sheet still above the scanning head will be reflected out of the optical system and the reflective scanning head will therefore not operate. If the sheet is introduced too quickly, the sheet will be lifted by the front cover and the redirection of the light beam will be similar to that if the sheet is introduced too slowly. , and the reflective scanning head is still not activated. The paper feed position monitoring system thus displays three possible states for a sheet in the paper feed position. This device therefore makes it possible to monitor the sheet feed position. However, there is no monitoring of the pulling process, the arrival of the sheets and their final position after pulling.

The task of the present invention is to monitor, in the simplest way, the arrival of sheets adapted to the pull-in, the pull-in process itself and the final position after the pull-in, and at the same time prepare the sheet-fed rotary printing press for operation. The goal is to shorten time and downtime.

According to the present invention, this problem is solved by the features described in claim 1 of the utility model registration claim.

The advantage of the invention is that the operator of a sheet-fed rotary printing press can use light-emitting diodes to detect what kind of fault condition is present when changing the direction of lateral pull, without having to switch over the electronic control unit. It is to be immediately known by means of the display panel and to be able to immediately deal with such factors that result in undesirable downtimes occurring as a result in sheet-fed rotary printing presses.

Another key feature of the invention is that the sensor can be applied regardless of the direction of attraction.
Therefore, the sensor can be used both on the left and on the right side of the paper tray. A digital electronic control unit detects the change in the direction of attraction based on the signal sequence sent by the sensor and subsequently provides a corresponding fault condition information transmission to the light emitting diode display panel.

The device according to the invention thus makes it possible to better monitor and align the supply of sheets. Automatically detecting the direction of attraction with the help of sensors, the direction of attraction is converted,
No extra operations required. Without this automatic redirection feature, it would be necessary to switch operations, remove the obsolete sensor from its active area, and replace the sensor on the opposite side.

Embodiments of the present invention will be described below with reference to the drawings.

In a sheet-fed printing machine 1 shown in FIG. 1 in which printing devices are connected in series, a sheet 8 to be printed
is supplied from the paper feeder 12 to the paper feed drum 13 of the first printing device 14 via the paper tray 2. The printing device 14 includes a plate cylinder 21, a blanket cylinder 16, and an impression cylinder 15.
is included. After each sheet has undergone a first printing, it enters the next printing unit 19 via a transport cylinder 17 and an inter-printing unit transfer guide drum 18. The printing device 19 includes a plate cylinder 21, a blanket cylinder 16, and an impression cylinder 22 as in the previous stage. Sheet 8 is printing device 1
After further printing at 9, the sheets are delivered to a delivery pile 4 with the aid of a chain delivery device 20.

Close to and above the feeder 2, sheet monitoring elements, for example consisting of reflective scanners 7, are fixed in the area on both sides in front (relative to the direction of sheet entry). A sheet monitoring element consisting of this reflection scanner 7 and a slot initiator 23 consisting of a call switch 10 and a call disc 11 are connected to an electronic control unit. The calling disk 11 of the slot initiator 23 is mounted on a one-rotation shaft, which is not shown in detail. The calling disk 11, which rotates synchronously with the machine, has two calling points, namely a and b.
can be located in The paging disk 11 of the slot initiator 23 shown in FIG. 3 is at paging point a. This means that the sheet 8 has already hit the front cover 6, as shown in FIG. 2, but has not yet been drawn to the cross needle 24 by the pull gauge 9. As the machine moves forward, the sheet 8 moves to the pull gauge 9.
, for example, toward the left horizontal needle 24. At the same time, the calling disk 11 of the slot initiator 23 reaches the calling point b, as shown in FIG. After the pulling operation has been completed, the sheet 8 is in the sensitive area of the reflex scanner 7 and hits the transverse needle 24 of the pull gauge 9, as shown in FIG.

The flowchart shown in FIG. 6 schematically shows the progress of pull gauge monitoring. When the power is turned on and the sheet-fed printing press 1 is in operation, the electronic control unit, based on the sequence of signals from the call switch 10, detects, in cooperation with both reflex scanners 7, whether the pulling operation has ended. . Corresponding to a signal sequence stored in the electronic control device, the electronic device automatically detects whether it is pulled to the right or to the left.

If the sensor does not provide the correct signal sequence, a fault condition is communicated and the call is repeated.

Once the electronic control unit detects, on the basis of the supplied signal sequence, that (the sheet) has been pulled towards the left, for example, this can be detected in the sheet-fed printing machine so that it is more visible to the operator. Paper feeding device 12 and printing device 1
The information is displayed on a light emitting diode display panel 33 provided on the board wall between 4 and 4.

Each time a pulling action is performed, the action is monitored in this manner.

When the pulling operation is completed, if the sequence of signals corresponding to the leftward pulling operation is not output, the electronic control unit transmits the information of one faulty condition and displays the corresponding information on the light emitting diode display panel 33. is displayed.

At the same time, the electronic control unit monitors on the basis of the signal sequence of the reflection scanner 7 whether the direction of attraction has changed. If the pulling direction has not changed, it means that there is a malfunction in the pulling operation, which is also displayed on the light emitting diode display panel 33.

If a change in the pulling direction is detected based on the signal sequence, the electronic control unit automatically prepares to monitor the pulling movement to the right, which is also displayed on the light emitting diode display panel 33. be done. The calling operation, the provision of information on the respective operating status and the automatic determination of the pulling direction take place on the right hand side in exactly the same way as on the left hand side, and this is repeated every time a new sheet comes in. In the block connection diagram of the pull gauge control shown in FIG. 7, there is first a mechanical synchronizing signal generator 25, which transmits the length of time and further signals for determining the actual state through a comparison device to the light emitting diode display panel 3.
It is operated to send to 3. Reflection scanners 26 and 27, still shown in the figure, are replaced by amplifiers 28
It is connected to the input section of the intermediate storage device 29 via. The input and output of the intermediate storage device 29 are collectively displayed as symbols. The output of the intermediate storage device 29 is then led to an input of a fixed value storage device 30, the output of which is in part fed to a light emitting diode display panel 33, and also to an acoustic type, not shown in detail here. The other portions are feedback-coupled to the state failure notification device 32, and the other portions are feedback-coupled to the input section of the intermediate storage device 29.

The electronic control unit reads the status of the double reflection scanners 26, 27 while the synchronization signal generator 25 issues one signal. The first calling operation is before the attracting operation. The status of the reflection scanners 26, 27 is passed via an amplifier 28 to an intermediate storage 29, from where this information is directed to an EPROM or programmable fixed value storage 30. The fixed value storage device 30 is now programmed to wait until a second call receives information regarding the status of whether the sheet has reached the target position determined after the pulling operation. It has been done.

Fixed value storage device 30 and synchronization signal generator 25 are 1
Once the necessary information has been stored during the generation of one signal, this storage device, according to its programming, stores the digital values on the light emitting diode display panel 33 which shows the signal sequence of the respective operating state.
or to the poor condition notification device 32 consisting of an acoustic alarm device. This calling operation and the provision of information on the respective operating status is repeated each time a sheet is received.

The light emitting diode display panel 33 shown in FIG. 8 is made up of display elements 34 to 45, which light up in accordance with their respective operating conditions. The display elements 34 to 45 are arranged independently in three columns, and one column includes three light emitting diodes 34,
There are 35 and 36. The light emitting diodes 34 and 35 are yellow-lit display elements corresponding to the right and left reflective scanners, respectively. The status of the slot initiator 23 is indicated by a yellow light emitting diode 36.
In the next row there are symbolically informative light-emitting windows 40, 41, 42, 43, 44, 45 which indicate the pulling motion. That is, the yellow symbol light-emitting windows 40 and 43 indicate the position of each side, that is, left and right. Each time the lateral position is properly settled, the symbol light emitting windows 44, 4
1 lights up in green depending on whether it is on the right or left side. If the stability of the lateral position is poor, the symbol light-emitting windows 42 and 45 light up in red to indicate this. The green light-emitting diodes 37, 39 indicate whether the sheet is properly in place; in the case of a defective state, the light-emitting diode 38 indicates this.

[Brief explanation of the drawing]

Figure 1 shows a sheet-fed printing machine equipped with a paper feeding device and a paper ejecting device, and Figure 2 shows the arrangement of the pull gauge control device on the paper tray, where sheets are placed before being pulled. Show the place. Fig. 3 shows the slot initiator in position a, and Fig. 4 shows the arrangement of the pull gauge control device on the paper feed stand, with a sheet placed thereon after being pulled. Figure 5 shows the slot initiator in position b, Figure 6 is a flowchart, Figure 7 is a block connection diagram, and Figure 8 is a light emitting diode display panel. 1...Sheet-fed printing machine, 2...Paper tray, 4...
Paper output pile, 6...Front cover, 7...Reflection scanner,
8... Sheet, 9... Pull gauge, 10... Call switch, 11... Call disk, 12... Paper feeding device, 13... Paper feeding drum, 14... Printing device, 15... Impression cylinder, 16...Blank cylinder, 17...Transfer cylinder, 18...Movement guide drum, 19...Printing device, 20...Chain type paper delivery device, 21...Print cylinder, 22...Impression cylinder, 23...Slot Point initiator, 24...Horizontal needle, 25...Mechanical synchronization signal generator, 26...Reflection scanner, 27...Reflection scanner, 28...Amplifier, 29...Intermediate storage device, 3
0...Fixed value storage device, 32...Poor condition notification device, 33...Light emitting diode display panel, 34-39
...Light emitting diode, 40-45...Symbol light emitting window.

Claims (1)

[Claims for Utility Model Registration] (1) A pull gauge connected to a drive device of the machine and applying a predetermined pulling motion to each sheet to be fed, including a pull gauge that is connected to the side edge of the sheet to be fed; A device for a sheet-fed rotary printing press, comprising a sensor device for monitoring the position of the edge, at least at the side edge of the device in the drawing direction, a sensor 7 is provided, the sensor being It emits two mutually different signals characterized by the position of the sheet before and after pulling, and a digital electronic control device is connected to the sensor 7, The electronic control unit checks the state of the sensor 7 before and after pulling, i.e. sheets that have not yet been pulled are outside the sensitive area of the sensor 7, and sheets that have already been pulled are outside the sensitive area. If the sensor 7 does not emit a signal characteristic of the position where the sheet exists at least once, it transmits information indicating that the sheet is in poor condition in response to the signal. A device for a sheet-fed rotary printing press characterized by: (2) The sensor 7 is not related to the pulling direction;
In other words, it can be used on either the left or right side of the paper tray and can be similarly adapted to any drawing direction, and the electronic control device can be used both before and after drawing. The position of the sheet in the sensitive area of the sensor 7 is automatically detected from the sequence of signals emitted by the sensor, and the dependence of the sensor 7 on the direction of movement of the pull gauge when the pulling direction is changed. 2. The apparatus for a sheet-fed rotary printing press according to claim 1, wherein the apparatus for a sheet-fed rotary printing press is characterized in that it transmits information of a poor condition only once based on the signal sequence of . (3) Claims for registration of a utility model characterized in that a light emitting diode display panel 33 having light emitting diodes, each having a light emitting diode for providing an indication of the associated operating status and malfunction, is connected to the digital electronic control device. Apparatus for a sheet-fed rotary printing press according to claim 1 or 2. (4) Any one of claims 1 to 3 of the claims for registration of a utility model, characterized in that the sensor 7 is one of reflective scanners 26, 27, a light enclosure, and a reflective light enclosure. Apparatus for a sheet-fed rotary printing press as described in . (5) The sheet according to any one of claims 1 to 4 of the utility model registration claim, wherein the sensor 7 is either a capacitive detector or a pneumatic detector. Equipment for leaf rotary printing presses. (6) The digital electronic control device sends a signal from the sensor 7 regarding the position of the sheet to the intermediate storage device 29 and the fixed value storage device 30, and the digital electronic control device causes a light emitting diode display Utility model registration claims that include at least one of the following: display on the board 33, visual or acoustic alarm in case of sheet misalignment, and change in machine operation; Apparatus for a sheet-fed rotary printing press according to any one of clauses 5 to 6.