GB2059637A

GB2059637A - Printing machine

Info

Publication number: GB2059637A
Application number: GB8034489A
Authority: GB
Original assignee: Polygraph Leipzig Kombinat Veb
Current assignee: Polygraph Leipzig Kombinat Veb
Priority date: 1979-05-09
Filing date: 1978-07-20
Publication date: 1981-04-23
Also published as: SE447852B; SU1097514A1; GB2049997B; GB2049997A; FR2455988A1; FR2455988B1; GB2059637B; CS224475B1; SE8003471L; DD142952A1; DE3009782A1; DE3009782C2

Description

1 GB2059637A 1

SPECIFICATION

Printing machine h. 20 The present invention relates to a printing machine with a control system for the cyclically 5 synchronous and sequentially correct control of functional groups of the machine by means of shift registers.

Shift registers controls for the cyclically synchronous and sequentially correct control of the functional groups of printing presses consisting of printing mechanisms are disclosed in, for example, German (Dem. Rep.) Patent Specification No. 89856, wherein respective shift registers are associated with the feeder and the actual printing press and the two shift registers are connected one behind the other.

Control devices for printing presses are also known, for example from German (Fed. Rep.) Patent Specification No. 2 707 011, in which cyclically timed control device constructed as shift registers are equipped with a system for compensating to the dead times of the actuators of the 15 functional groups. A drawback in this case is that although the shift registers, when cyclical timing is carried out with a plurality of periodic rhythms per 360, enable a relatively exact cyclically synchronous functional group control at the sequentially correct instant, the shift register is of a substantial size. In those cases where timing with two or three periodic rhythms per 360' takes place, an exact cyclically synchronous functional group control at the sequenti- 20 ally correct instant is not possible, even though the size of the shift register is substantially smaller. The cost of the system in both cases is further increased by necessary provision for compensation for dead time, in particular due to compensation for instantaneous values of the rotational speed.

There is accordingly, a need for a printing machine with a control system by means of shift 25 registers involving relatively low technical complication and expenditure of costs, in conjunction with an economical variant for compensation for dead time.

According to the present invention there is provided a printing machine comprising a plurality of functionally interrelated elements, a plurality of electrically operable actuators for cyclically synchronous and sequential actuation of the elements, a single control shift register and a plurality of transfer shift registers connected in cascade for controlling the operation of the actuators, each of the registers having a timing input and an information input for receipt of signal pulses controlling the registers, the timing inputs of the transfer shift registers being connected to outputs of the control shift register and the information input of the second and the or each subsequent transfer shift register in the cascade being connected to an output of the 35 immediately preceding register, first timing means cyclically operable to deliver to the timing input of the control shift register a plurality of pulses in each timing cycle, second timing means operable to deliver a synchronising pulse to the information input of the control shift register, and sheet monitoring means operable to monitor sheets and to deliver signal pulses in dependence on such monitoring to the information input of the first transfer shift register of the 40 cascade.

Preferably, the actuators of the functional groups are disposed after a first bit of the transfer shift register.

For preference, the printing machine comprises a plurality of pulsesuppressing means and dead-time compensating means connected between the control shift register and the timing inputs of the transfer shift registers, each dead-time compensating means being connected to a series of stages of the control shift register and each pulse-suppressing means comprising a storage device, which is provided with a setting input connected to an output of a respective one of the compensating means and with a resetting input connected to a bit of the control shift register following said series of stages, and pulse-shortening means connected to an output of 50 the storage device.

In another embodiment of the invention, the control shift register is constructed as a ring counter.

According to yet another embodiment, a respective second timing means is connected directly with each input of the dead-time compensating means and the timing signals of the second 55 timing means are spaced at required intervals.

Embodiments of the present invention will now be more particularly described by way of example with reference to the accompanying drawing, which is a schematic circuit diagram of a printing machine control system according to one embodiment of the invention.

Referring now to the drawing, the illustrated control system comprises a control shift register 60 1.0' and transfer shift registers 2.1 ', 2.2'. The shift registers each have a timing input and an information input. The timing input TP of the control shift register is connected to a first timing device 4', which generates a plurality of periodic pulses per 360', for example at each 30'. The timing inputs Tu of the transfer shift registers are connected to the control shift register 1.0', which is arranged to provide one signal per 360' at the output of each bit.

2 GB2059637A 2 Dead time compensating devices 3' are connected after the control shift register.

Each dead time compensating device 31 consists of a plurality of first AND-elements, first inputs of which are connected to successive bits of the control shift register. The number of bits depends-allowing for the timing sequence upon the necessary compensating range. If the necessary compensation range is, for example, 0 to W, then with a periodic cycle of 30, four bits ar, connected to the compensating device X.

Second inputs of the AND-elements 9 are connected to the outputs of a control circuit 1 W. The control circuit 10' has an input which is connected to a speed transmitter (not shown) mounted on the printing machine. Each output of the circuit 10, represents a specific speed 10 range, for example:

First output, speed range 0-3000 Second output, speed range 3000-5000 Third output, speed range 5000-7000 etc.

The digitalizing of analogous speed values in the control circuit is carried out by known means and therefore is not explained in detail.

An OR-gate, which constitutes the output of the dead time compensating device, is connected to the outputs of the AND-elements.

Actuators 6' are disposed after the dead time compensating devices 3'.

The information inputs 1, 1.0' of the control shift register 1.0, is connected to a second timing device 17, which generates a periodic synchronizing signal. Synchronizing may take place either only at the start of control or at the start of control and during running of the machine.

The outputs of the dead time compensating device 3' are connected, via impulse-suppressing 25 devices 12, with the timing inputs T. 2.1', T,, 2. 2' of the transfer shift registers 2.1', 2.2'.

Each impulse-suppressing device 12 consists of a memory 18, the setting input of which is connected with the output of the dead time compensating device 3' disposed in front thereof, and the resetting input of which is. connected with the bit of the control shift register 1.0' that is situated after the last bit gonnecte.d to the related dead time compensating device X. Device 12 30 further consists of a device 19 fai impulse width shortening, for example a monostsble multivibrator. 1 The information input 1, of the first transfer shift register 2.1' is conneqted to a sheet monitoring device 7' and ge information inputs],, of the succeeding transfer shift registers 2 are connected, according tod the rotational angle relationship of the printing mechanism, with a 35 respective output, usually of the last bit of the preceding transfer shift register. Each of the actuators 6' is connected to the first bit of the associated transfer shift register. If required, a hand control device 8' is disposed between the first bit of each transfer shift register and the associated actuator. The hand control device 8' makes possible a cyclically synchronous incorporation and disconnection of the relevant actuator 61, from the automatic cycle of the control. The hand control device 8' contains an AND-element 13, a second input of which is connected to the output of a memory 14. The inputs of the memory 14 are connected via governing AND-gates to the output of the impulse-suppressing device 12 and the output of an actuator device 16. A first input of the AND-element 13 is connected to the output of the first bit of the associated transfer shift register 2.

In another embodiment of the invention, the control shift register 1.0, is constructed as a known ring counter. In this embodiment, the timing device 17 is omitted.

In yet another embodiment, the control shift register 1.01' is omitted. Each input of the dead time compensating device 3 is then connected to a respective timing device 17. The timing signals of the timing devices 17 are spaced according to the requirements, for example at 50 intervals of 30.

In operation of the control system, the control shift register 1.01 is governed in the manner already described via the timing input T, 1.0' and the information input Is 1.0'. The timing device 17, which is connected to the information input Is 1.0', generates a periodic synchroniz ing signal for bringing the control shift register 1.0' into operation. This signal is provided at every 360' by the timing device 17. It is also possible to generate a timing signal only at the commencement of the control by the timing device 17. For further signal processing in the dead time compensating devices 3', the first AND-gates of each device 3' are fed with signals from the control shift register at 30', 60', 90' and 120'. Depending upon the operating speed of the press, a first AND-gate receives a signal, so that the AND-condition is satisfied and the signal is 60 fed via the OR-gate as the output signal of the device 3'. The signal of each dead time compensating device X-there is one signal per 360', but instead of 360, cycles any other coarse resolution greater or smaller than 360' is possible according to the construction of the press-serves, after passing through the impulse-suppressing device 12, to govern the transfer shift register 2.1' in conjunction with a sheet monitoring signal from the sheet monitoring 65 is ' 4 1 3 GB2059637A 3 device 71. In the device 12, the pulse that is present is widened to a pulse width of 90', in order to prevent double pulse timing at intervals of 30' when switching over from one speed range to another. 5 For this purpose, the memory 18 is set by a signal from the associated dead time compensating device 3', so that a double setting when switching over from one speed range to another is prevented and is reset by a signal which is present, after the last possible signal, at the output of the dead time compensating device. Pulse shortening is then effected by means of the device 19. At the output of the first bit of the transfer shift register 2.1, or 2.2', a signal is now available for controlling the actuators 61 via the hand control device 8'.

The hand conttol devive 8' enables cyclically synchronous incorporation and disconnection of the actuators 6' from the automatic control cycle. When the actuating element 16 is not actuated by a signal from the dead time compensating device 3', the memory 14 changes into a state in which a signal is emitted. This signal is fed to the AND-element 13, the AND condition of which is then satisfied so that a cyclically synchronous control of the actuator 61 is made possible.

When the actuating device 16 is actuated and a signal from the dead time compensating device 3' is present, the memory 14 changes into its inactive state, i.e. there is no signal at its output, with the result that the AND condition of the AND-element 13 is not satisfied and the actuator 6' is not actuated.

The sheet signal is fed, after the cyclical displacement in the transfer shift register 2.1 ', to the transfer shift register 2.2" and is there linked with the signal from the associated dead time compensating device 3'. The output signal from the transfer shift register 2.2, serves for governing a further group of actuators 6.

In the third-mentioned embodiment, the cyclical timing of the dead time compensating device 25 is carried out by timing devices 17, which are connected to each of the inputs of the dead time compensating device and supply one pulse per 360'. The pulses of the third timing devices are spaced at intervals of, for example, 30'.

Claims

1. A printing machine comprising a plurality of functionally interrelated elements, a plurality of electrically operable actuators for cyclically synchronous and sequential actuation of the elements, a single control shift register and a plurality of transfer shift registers connected in cascade for controlling the operation of the actuators, each of the registers hacing a timing input and an information input for receipt of signal pulses controlling the registers, the timing inputs 35 of the transfer shift registers being connected to outputs of the control shift register and the information input of the second and the or each subsequent transfer shift register in the cascade being connected to an output of the immediately preceding register, first timing means cyclically operable to deliver to the timing input of the control shift register a plurality of pulses in each timing cycle, second timing means operable to deliver a synchronising pulse to the information 40 input of the control shift register, and sheet monitoring means operable to monitor sheets and to deliver signal pulses in dependence on such monitoring to the information input of the first transfer shift register of the cascade.

2. A printing machine as claimed in claim 1, wherein each of the transfer shift registers comprises a first stage connected to a respective one of the actuators.

3. A printing machine as claimed in either claim 1 or claim 2, comprising a plurality of pulse-suppressing means and dead-time compensating means connected between the control shift register and the timing inputs of the transfer shift registers, each dead-time compensating means being connected to a series of stages of the control shift register and each pulse suppressing means comprising a storage device, which is provided with a setting input connected to an output of a respective one of the compensating means and with a resetting input connected to a bit of the control shift register following said series of stages, and pulse shortening means connected to an output of the storage device.

4. A printing machine as claimed in claim 1, wherein the control shift register and second timing means are provided by a ring counter.

5. A printing machine as claimed in claim 1, wherein the control shift register and second timing means are provided by respective timing means operable to deliver timing signal pulses at selected intervals to an input of each compensating means.

6. A printing machine substantially as hereinbefore described with reference to the accompa nying drawing.

Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd-1 981 Published at The Patent Office, 25 Southampton Buildings, London, WC2A 'I AY, from which copies may be obtained.