JP2000351199A - Device or detecting position of plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the position of a plate by a mechanical pressure sensor. SOLUTION: A stopper 21 having a circular cross section and pressure sensors 27, 28 are provide to the recessed part 25 of the lower clamp piece 20 for clamping the plate 16 on the plate cylinder 11 of a printing unit and a stopper 22 having a square cross section and a pressure sensor 29 are provided to the recessed part 26 thereof. The signals outputted from the pressure sensors 27, 28, 29 corresponding to the pressure accompanied by the own wt. of the plate 16 reach a first induction transmitter 32 through a first electronic apparatus 31 to be transmitted to a second induction transmitter 33 to be supplied to a second electronic apparatus 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for detecting the position of a plate on a cylinder of a rotary printing press.

[0002]

BACKGROUND OF THE INVENTION It is generally known to use a circuit which can be closed in order to check that the plate is correctly registered in register, by means of a clamping device in a reference notch of the plate. This is done by fitting the registration bolts.

[0003] An arrangement in which a conductive stop for the plate is provided is known, for example, from EP 0 551 1976, in which a high-precision device for the plate in contact with the stopper uses a conductive stop. The gender plate closes the circuit, and thus the exact position of the plate is known.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for detecting the position of a plate without activating a conductive stopper.

[0005]

According to the present invention, there is provided, in accordance with the invention, registration means corresponding to the edge of the plate,
In a device for detecting the position of a plate on a plate cylinder of a printing press, this is achieved in that each registering means is associated with at least one mechanical pressure sensor.

It is preferable that a mechanical pressure sensor is attached as the plate detecting means.

[0007] Each registering means corresponding to the edge of the plate is associated with at least one mechanical pressure sensor. The mechanical pressure sensor is located in the region of the line of action of the force that occurs when the registering means undergoes mechanical deformation or warpage. The mechanical pressure sensor is preferably located close to the registration means, for example a stop, since it can amplify and accurately detect the pressure exerted thereon.

[0008] It is particularly preferred that the mechanical pressure sensor is arranged at the bottom of the clamping piece in which the register means is arranged.

In a further preferred configuration, a region of reduced force is provided around the registering means by a through-hole or recess, whereby the registering means is tilted with only a small force. In this case, the mechanical pressure sensor may be arranged on a bridge provided between the through holes.

In an embodiment of the present invention, the mechanical pressure sensor comprises a piezoelectric ceramic vibration sensor. Piezoceramic vibration sensors have the advantage, firstly, of reacting to conditions such as dynamic changes, ie the introduction of a plate. Slow pressure changes, such as aging of the machine or support of machine parts, are no longer detected in this case.

[0011]

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

A rotary printing press, for example a printing press 1 for processing sheets, has a paper feed device 2, at least one printing unit 3 or 4, and a paper output device 6. The sheets are removed from the sheet pile 8 and are fed individually or partially overlapped over a supply table 9 to the printing units 3 and 4. Printing units 3 and 4
Are provided with plate cylinders 11 and 12, respectively, by a well-known method. The plate cylinders 11 and 12 respectively have clamping devices 13 and 14 for fixing the flexible plate 16. Furthermore, semi-automatic or fully automatic plate changing devices 15, 17 are associated with the respective plate cylinders 11, 12.

In the embodiment shown in FIG. 3, each of the clamping devices 13 and 14 is, in particular, a clamping rail 18.
It is composed of The clamp rail 18 has a fixed upper clamp piece 19 and a movable lower clamp piece 20. According to the embodiment of FIG. 4, in the receiving area of the printing form 16 formed by the clamping pieces 19, 20 the stops 21, 22 cooperating with the printing form leading edge or with the stampings 23, 24 at the printing form leading edge. Is provided. The stoppers 21 and 22 can be disposed movably in the axial direction or the circumferential direction with respect to the lower clamp piece 20.

The stoppers 21 and 22 are connected to the lower clamp piece 2.
It is attached to the concave portions 25 and 26 provided in the “0”.
Similarly, the recesses 25 and 26 have mechanical pressure sensors 2
7, 28, 29, preferably a piezoelectric force sensor for measuring force and mechanical pressure is arranged. Piezoelectric force sensors are particularly suitable because they make dynamic measurements, i.e., the measuring signal is reduced again after the measuring process. The pressure sensors 27, 28, 29 are preferably arranged on the side facing the plate 16 when viewed from the register means (stoppers) 21, 22.

In order to be able to detect the degree of the inclined state of the plate 16 at the stoppers 21 and 22, the pressure sensors 27 and 28 of the stopper 21 having a circular cross section are angled relative to each other (for example, α = 30 ° to 150 °),
Preferably, they are arranged on the stopper 21 so as to form a relative angle of 45 °. This arrangement allows for uneven distribution of pressure, thereby registering the inclination of plate 16. The third pressure sensor 29 is attached to the stopper 22 having a rectangular cross section.

The pressure sensors 27, 28, 29
In particular, it is connected to the first electronic device 31 arranged on the lower clamp piece 20 by electric wiring.

To transmit data captured by the pressure sensors 27, 28, 29, a first inductive transmitter 32
Is provided on the end face side of the plate cylinder 11, and the first guide transmitter 32 is fixedly arranged during the supply of the plate leading edge and during the clamping process.
And facing each other. The second inductive transmitter 33 is
The data supplied from the first guiding transmitter 32 is guided to the second electronic device 34. The second electronic device 34 is connected to a control computer 36 of the printing press to use the data.

In an alternative to the inductive transmission of data and energy (FIG. 6), the energy supply 42 is arranged directly on the lower clamping piece 20 to which the electronics 31 are connected. Here, the energy supply source 42 may be, for example, a battery, a storage battery, or a generator connected to a rechargeable storage battery to which energy is supplied by rotation of the plate cylinders 11 and 12. Accordingly, display means 43 and 44, preferably LED indicators, are attached to the register means 21 and 22, respectively.

The plate 16 supplied to the plate cylinder 11 by the plate supply devices 15 and 17 rests on the stoppers 21 and 22 substantially by its own weight, so that slight deformation is caused by the concave portions 25 and 22. It occurs at the bottom of 26 at the position where the stops 21, 22 are fitted. In this case, the mechanical pressure sensor 2 is placed on the line of action of the force generated by the mechanical pressure.
7, 28 and 29 are attached.

In order to strengthen the line of action of the force, a stopper 2
Through holes 37 and 38 are provided in the area around 1 and 22, and pressure sensors 27, 28 and 29 are arranged on the bridge portions 39 to 41. As a result, a greater mechanical pressure, such as a load applied to the stoppers 21, 22 by the plate 16, is generated in the bridge portions 39, 41, and thus a larger plottable signal is generated in the electronic device 31.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sheet-fed rotary printing press.

FIG. 2 is a schematic view of a plate cylinder at a plate supply position.

FIG. 3 is a schematic sectional view of a clamp rail receiving area on a plate cylinder.

FIG. 4 is a plan view showing the arrangement according to the invention of a mechanical pressure sensor.

FIG. 5 shows a second embodiment of the arrangement of the mechanical pressure sensors.

FIG. 6 is a view showing a state in which the display means and the energy supply means for the slide rail are arranged in the embodiment of FIG. 4 or FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing machine 2 Feeder 3, 4 Printing unit 6 Discharge device 7 Sheet 8 Sheet pile 9 Supply stand 11, 12 Plate cylinder 13, 14 Clamping device 15 Semi-automatic or fully automatic plate exchange device 16 plate Reference Signs List 17 semi-automatic or fully automatic plate changing device 18 clamp rail 19 upper clamp piece 20 lower clamp piece 21, 22 stopper 23, 24 punching portion 25, 26 recess 27-29 pressure sensor 31 first electronic device 32 first Guide transmitter 33 Second guide transmitter 34 Second electronic device 36 Control computer 37, 38 Through hole 39, 41 Bridge section 42 Energy supply source 43, 44 Display means α Angle

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G01L 5/00 B41F 33/14 K (71) Applicant 390009232 Kurfuersten-Anlage 52-60, Heidelberg, Federal Republic of Germany

Claims (13)

[Claims] 1. An apparatus for detecting the position of a plate on a plate cylinder of a printing press, wherein said register means is provided at a position corresponding to an edge of said plate. Has at least one mechanical pressure sensor (27, 28, 2)
9) A device for detecting the position of a plate, wherein the device is attached. 2. The device according to claim 1, wherein said registering means is a stop in the form of a pin or a bolt. 3. The pressure sensor (27, 28, 29).
Device according to claim 1 or 2, wherein a device is arranged in the immediate vicinity of the stop (21, 22). 4. Apparatus according to claim 1, wherein the pressure sensor (27, 28, 29) and the stopper (21, 22) are mounted on a clamping piece (20). 5. The stopper (21) has a circular cross section, and the stopper (21) has two pressure sensors (2).
Device according to any of the preceding claims, wherein the device (7, 28) is attached. 6. Device according to claim 5, wherein the pressure sensors (27, 28) are arranged at an angle α to one another. 7. The device according to claim 1, wherein the stop has a rectangular cross-section, and the stop is associated with the pressure sensor. . 8. The device according to claim 1, wherein a through-hole and a bridge are provided in a region around the registering means. Equipment. 9. The mechanical pressure sensor (27, 28,
Device according to claim 8, wherein 29) is arranged on the bridge part (39,41). 10. A first inductive transmitter (3) is attached to the plate cylinder (11).
2), wherein the first inductive transmitter (32) is provided.
10. The arrangement according to claim 1, wherein the plate feeds a second guide transmitter, which is fixedly arranged, for data transfer. apparatus. 11. The pressure sensor (27, 28, 29).
11. The device according to any one of the preceding claims, wherein is a piezoelectric force sensor. 12. The device according to claim 1, wherein at least one display means (43, 44) is arranged on the clamping piece (20). 13. Apparatus according to claim 1, wherein an energy source (42) is arranged on the clamping piece (20).