DD285759A5 - ARRANGEMENT FOR BOW CONTROL - Google Patents

Abstract

The invention relates to a device for sheet control on the registration marks of printing presses. The object of the invention is to provide a device for sheet control on the Anlegmarken of printing machines with an increased time for the calming of the bow to the Anlegmarken. According to the invention, the object is achieved by a device for sheet control on the registration marks of printing machines with sheet scans, an evaluation circuit, a clocking means clocking the evaluation circuit to a timing determined by the response time of Bogenfreigabe- and -lock mechanisms and a downstream of the evaluation circuit Bogenfreigabe- and -locking mechanism in that the sampling time is variable and inversely proportional to the machine speed. Investment; Sheet control; sampling; Variable; Machine speed; Clock means}

Description

VEB Combined Polygraph

"Werner Lamber" Leipzig

7050 Leipzig Leipzig, the 22. 6.

Title of the Invention Device for Bow Con trol

Field of application of the invention

The invention relates to a device for BogenkontrolIe at the registration marks of printing machines.

Characteristic of the known state of the art

There are facilities for sheet control on the Anlegmarken of printing machines known (DE 30 44 643), the sheet sensors. a clocking means clocking the sheet sensors, an evaluation circuit and Bogenf -eigabe- and -lock mechanisms included. The clock time

(Hesszeitpunkt) is so fatigued that at maximum Haschinangesohwindigkeit still a Betetigung the Bogenfreigabe- and -lock mechanisms is mglich. O er Hesszeitpunkt is assigned a "fixed angle value of the single-turn shaft, which corresponds to the response time of the sheet release and locking mechanisms at maximum machine speed. The disadvantage here is that by this response time, the time for the reassurance of the conveyed to the Anlegmarken bow, which is "oegüchst long to be limited, and thus due to the limited rest period, the plant of Bogrns can not be accurate"

Object of the invention

The aim of the invention is an increase in the accuracy of the sheet system and thus a quality improvement of the printed products, as well as the prevention of stoppers.

Explanation of the essence of the invention

The object of the invention is to provide a device for sheet control en the Anlegmarken of printing machines with t / iner increased time for calming the bow to the Anlegmarken.

According to the invention, the object is achieved in a device for sheet control β at the Anlegmarken of printing machines with Bogenabtastungen, an evaluation circuit, the evaluation circuit to a by the response time of Bogenfreigabe- and -lock mechanisms related sampling timing clocking device and a Auewerteschaltung downstream Bogenfreigabe- and locking mechanism thereby solved in that the sampling time is variable and inversely proportional to the machine speed.

The subdevice contains a periodic clock delivering pulse generator, a Orehzahlmesseinrichtung and a eingangssei tig with de «pulse and the Drehzehlmesseinrichtung and Ausgangssgangssei t ig connected to the evaluation, the clock time for the evaluation proportional to the machine speed shifting clock shift device.

Ausfuehrungsbeispiel

The invention will be explained in more detail below to an exemplary embodiment. In the accompanying drawing show!

Fig. It diagram clock shift Fig. 2: angle of rotation diagram

Fig. 3t block diagram of the device for Bogenkon trolIe

Fig. 4t block diagram clock shifting device Fig. 1 shows a rotation angle diagram for the sheet system

of printing machines.

The rotation angle range / ETW = 360 ° relative to a Single-turn (ETW) is divided into the Orehwinkelbereich

for the sheet feed A, the rotation angle range for the

Bow pacification B, which coincides with the sampling time

(Check time) f A ends and

the rotation angle range C

the constant response time for sheet release and lock mechanisms 3 ·

The sampling time must be set so that also

at maximum engine speed, the response time for

the bogon release and locking mechanism is available. This response time limits the settling time of the sheet to d * <i markers.

Oer according to the teaching of the prior art at all machine speeds constant sampling time J A is inventively variable and inversely proportional to the machine speed set (Fig. 2). Owing to this, at low machine speed <* 9 min., A sampling time J Amax is obtained, which ensures an extremely long settling time Bmax of the arc at the feeders (FIG. 1).

Conversely, at maximum

Machine speed C ^ max a sampling time YES min, which ensures only an irs settling time Bmin of the arc, but ae necessary rotation time of the sheet release and -aperrmechanismen 3 still guaranteed.

In Fig. 3, the clock shift device in Connection to the sensors 11; 14 and the sheet release

and lock mechanisms 3 shown.

The arranged on the side 1 of the sheet system Bogenabtastung 1 and on the side 2 of the sheet system

Arranged sheet scanning 2 are identically constructed and each contain a sensor 11; 14 and a respective downstream amplifier 12; 15. The the

Verstaerkerausgaengen downstream flip-flop's 13; 16

are part of an evaluation report 6. The

The evaluation circuit also contains an information about the False-bow signal lines 17; 18 with the outputs of the Flip-flop's 13; 16 connected linking circuit 4,

which has a release signal input 5. The

Input signal 5 is available with the machine control

connected.

Ausgangsseitiq is the Verknuepfungsschaltung 4 over the Locking signal 1 ei t un-j 19 with the sheetfed and - Locking mechanisms 3 connected. D flip-flop 13; 16 of the evaluation circuit 6 are over

the clock line 21 on the input side with the

Clock shift device 7 of the clock device 26 is connected. The clock device 26 further contains a pulse generator 9, which is in operative connection with a Eintourenwelle IO and both directly via the sync pulse line 22 and the pulse line 23 al? Also indirectly via "ine Orehzahlmesseinrichtung 8 is connected to the clock shifting device 7. The connection between the Drehzahlmeeseinrichtung 8 and the Taktverachiebeeinrichtung 7 via a Orehzahlbus 20th

The clock shifting device 7 (FIG. 4) has a decoder 24 connected on the input side to the speed bus 20, the outputs of which are arranged in the same parallel input as shift register 25 * D # r The serial output of the shift register is connected to the clock line 21.

The pulse line 23 leads to the clock input C and the sync pulse line 22 to the loading input L of the shift register 25th

The operation of the solution according to the invention will be described below.

The sheet leading edge of page 1 is detected by the sensor 11. The downstream amplifier 12 amplifies the relatively weak signal of the sensor in a known manner and feeds it into the information input D of the flip-flop 13 in a Gothic-armed form. In anticipation of the active clock edge which reaches this flip-flop 13 at its clock input C via the clock line 21 and which corresponds to the sampling time / a, the flip-flop activates its output Q under "Jar condition that the sensor 11 has registered no sheet edge (fault). This missing-bow signal is linked in the linking circuit 4 in known wines with the release signal 5 "supplied by a higher-order control system

and generated in the event of an error (no sheet edge detected) the blocking signal on the blocking signal line 19, which the

Sheet release and locking mechanisms 3 of the printing machine

influenced and leads in a known manner to stop the sheet run.

The clock signal on the clock line 21 is generated as follows. The arranged on the Eintourenwelle (ETW) 10 pulse generator 9, preferably designed as 2 inductive initiators generated per revolution of the ETW once the sync pulse over the sync pulse line 22 during the machine cycle periodically the clock shifter 7 is zugefcehrt and also the so-called Zaehltakt, several times generated per revolution of the ETW and about the impulse line 23 of the clock shifting device 7 and the Orehzahlmesseinrichtung (8) is fed. Assumed is the structure and operation of the Orehzahlmesseinrichtung θ provided (internal timer tort a Zaehlkanal, so that the current Zaehlerstano is proportional to the respective machine speed co ). The data word representing the current speed is also fed to the clock shift device 7 as a bus in the form of the speed bus 20.

The current machine speed is constantly in the form of the Orehzahlbusses 20 as bineere information at the input of the Oekoder 1 from η 24. Oie word width of Orehzahlbusses 20 is identical to the number of outputs η of the encoder 24th

Depending on the particular

Machine speed now activates the decoder 1 from η 24 one of its outputs in the form that at the highest engine speed at the shift register 25, the parallel input η and at the lowest engine speed of the parallel input 1 are controlled. With the synchronizing pulse delivered once per revolution of the ETW, the loading input L of the shift register 25 is activated by the synchronizing pulse line 22, Oer counting clock drives the clock input C of the shift register 25, causing it to do so before

bits loaded by the sync pulse With the joden count clock to shift one memory location to the left towards the nta memory location. If the information to be shifted has arrived at the serial output η of the shift register 25, the clock line 21 is thus activated and the flip-flops 12 and 13 respectively take the information present at their D inputs into the outputs Q.

Oie clock shifter 7 effected by presetting the shift register 25 to the current speed by means of the sync pulse advancing the clock time at higher machine speeds, whereas at lower Maschinengeechwindigkeiten the clock line 21 is activated only at a later time.

According to FIG. 2, the existing propertionality between ) A and W permits the statement that in order to comply with the design-related, constant response time of the sheet release and locking mechanisms, the bow pacification Jm extends a maximum amount at a minimum printing speed; can be. The extension of the settling time is only possible when printing at maximum printing speed. This limiting case is rare in practice.

Claims (1)

28 5 75 claims Means for bow control to deο lay marks of printing machines with sheet samples einbr evaluation circuit, an evaluation circuit to a caused by the response time of the Bogenfreigabe- and locking mechanisms sampling gating clock means and the evaluation circuit downstream Bogenfreigabe- and -sperrmechanismus, as characterized by, that the sampling YES variable and inversely proportional to the machine speed fixed branch. Apparatus for sheet control according to claim 1, characterized in that said means Clock device (26) supplying a periodic clock pulse impeller (9). a speed measuring device (8) and a eingangssei tig with the pulse generator (9) and the speed measuring device (8) and ausgangssei tig with d * r evaluation circuit (6), the clock time for the evaluation circuit (6) proportional to the speed of the machine shifting clock displacement device (7) contains.