DE3942987A1 - Regulation of speed of production line - having sensors coupled to processing circuit to generate data for use in EPROM to regulate output - Google Patents

Abstract

The processing machine system of the type handling books (7) has a number of stations (1,2) that are linked by a conveyor (3). The output of each station has an associated sensor (4). Two further sensors (5,6) are used to detect build up on the conveyor track. The output of the station sensor connects with a monostable (9), delay (10) and processing circuitry (16,17) coupled to an EPROM memory (18) to control the speed of the next station (2) along the line. Trend analysis may be carried out on the product rates to establish the command data to be entered into the EPROM memory. ADVANTAGE - Provides optimum regulation of production line rate.

Description

The invention relates to a method for regulating the operational rotation number of processing machines, especially a linked one Machine in processing technology where the machine cycle be adjusted by discontinuously arriving products got to.

In the field of processing technology or metal processing Industry are two basic technical solutions tion of the processing goods to chained processing machines known:

• - Infeed of the material to be processed bound in the machine cycle
• - discontinuous feeding.

In the case of discontinuous feeding, there are storage sections, magazines or similar clock synchronization devices for use. The Product stock in the clock synchronization devices influenced in known technical facilities, the operating speed of the Ver machine and controls the feeding of the processing good.

Processing machines operating at constant speed run or run empty cycles when there is insufficient capacity be stopped. The same applies to overproducts of previous machine for overcrowding the storage section or Magazine, what a shutdown of the feeding machine or the Redirecting the processed goods into emergency displays. Around to accommodate the underutilization of the processing machine, the speed is selected higher than necessary. That leads z. B. at Three knife cutting machines for an additional knife and Cutting bar wear due to empty cycles. Machines with variable speed depending on the level of Storage tanks or storage sections speed-controlled. At quick Changing cycles in the product feed are also here Empty clocks inevitable.

Such control processes according to the known technical means are too sluggish in practice, so that even with highly productive Machines experience the above disadvantages.

The aim of the invention is to provide a method for regulating the operation speed of a processing machine with which the  Productivity of such machines with constant wear is increased.

The object of the invention is therefore the method to design that allows control of the operating speed that is responsive and in small tolerance ranges the discontinuously supplied processing material reacts and thereby setting an optimal operating speed.

According to the invention the object is achieved in that the consequence of the incoming products over a frequency or period measurement is established within a subordinate Processing machine upstream transport section a Un ter or over occupancy is detected by at least two sensors, depending on this product occupancy by the process corrected value is corrected in an EPROM and the stepless position of the drive motor by the EPROM determined guide size takes place.

The advantages of the regulation according to the invention consist in avoiding empty clocks, on the other hand, overcrowding the upstream storage section avoided, resulting in shorter traffic jams distances can be realized. The regulation optimizes this Start-up behavior of chained machines and contributes to an increase the productivity and reliability of the machines in the chain association.

The invention is explained in more detail below using an exemplary embodiment. The block diagram of the invention is shown by the single figure shown in the drawing. The processing machines 1; 2 , for example for processing books or book blocks in industrial bookbinding, are linked together by conveyor belts 3 . A sensor 4 is installed at the output of processing machine 1 ; two further sensors 5 and 6 are located on the accumulation section 8 in front of the processing machine 2 .

The signals sent by the sensor 4 are sent to a counter 11 via a monoflop 9 and a delay 10 . This counter 11 is connected to a clock generator 17 and divider 16 . On the output side of the counter 11 , a memory 13 , adder 12 and a first shift register 14 are arranged, which transmit command variables to an EPROM 18 , which is connected directly to the drive motor 20 of machine 2 via an actuator 19 for speed-controlled motors.

In addition to the connection of the counter 11 to the clock generator 17 , the latter is also linked to the EPROM 18 via a divider 16 . The sensors 5 and 6 installed on the storage section 8 are connected to the EPROM 18 . The products 7 coming from the machine 1 trigger a pulse on the sensor 4 at a defined edge, which is shortened by a monoflop 9 and switches a counter 11 with a delay. The pulses emitted by a clock generator 17 are thus counted and 7 digital measured values are formed in accordance with the sequence of the products. These measured values, which characterize the distance between the incoming products 7 , are supplied to a memory 13 , adder 12 and the first shift register 14 for averaging in a known manner.

This averaging is used to generate a reference variable which, despite short-term fluctuations in the sequence of the incoming products 7, guarantees harmonious speed control. In addition to averaging, other mathematical methods are also conceivable, for example a trend analysis to determine the reference variable.

The calculated command variable is transferred to an EPROM 18 , which allows corrections to be made. These corrections are triggered by pulses from sensors 5 and 6 , which in the traffic jam route 8 register an under- or over-occupation. The program optimization of the EPROM 18 for correcting the guide speed can gen SUC by a mathematical equation, or by a binary table. These guiding size influences the actuator 19 for variable speed motors, such as frequency converters for Asyn chronmaschinen or thyristor for DC drives. The signal values from the sensors 4, 5 and 6 can also be processed directly via a control computer and fed to the actuator 19 .

Reference numerals

1 processing machine
2 processing machine
3 conveyor belt
4 sensor
5 sensor
6 sensor
7 product
8 storage section
9 monoflop
10 delay
11 counters
12 adders
13 memory
14 slide register
15 slide registers
16 dividers
17 clock generator
18 EPROM
19 actuator
20 drive motor

Claims (1)

Method for regulating the operating speed of a processing machine, in which the supply of the processing material is carried out by a stepless control of the operating speed, characterized in that

• a) the sequence of the incoming products ( 7 ) is determined via a frequency or period measurement,
• b) an under- or over-loading is detected by at least two sensors ( 5; 6 ) within a transport section upstream of a downstream processing machine ( 2 ),
• c) depending on this product assignment, the value determined by method step a) is corrected in an EPROM ( 18 ) and
• d) the infinitely variable position of the drive motor ( 20 ) takes place through the reference variable determined by the EPROM ( 18 ).