JPS605364Y2 - Servo type program setter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a servo-type program setting device, and more specifically, the present invention relates to a servo-type program setting device, in which a program curve drawn on a program sheet wound around a cylindrical rotating drum is driven by a servo system. Solve the problem caused by the discontinuity between the winding start end and winding end of the program sheet in a device configured to detect and follow the detection head and send a program signal corresponding to the position of the detection head. This is what I did.

Generally, temperature and pressure control in a manufacturing process is often performed according to a predetermined time plan (program).

In this case, in order to improve the complexity of changing program settings while monitoring the instrument, a program setting is configured to send out a program signal to automatically change the settings according to a pre-written program. Vessels are often used, and various configurations have been put into practical use.

One type of such device is a cylindrical rotating drum that is wrapped around a program sheet with a program curve drawn in advance, and a detection head driven by a servo system detects and follows this program curve, and also detects and tracks the program curve according to the position of the detection head. Some are configured to send a program signal.

By the way, in the device in which the program sheet is wound around the rotating drum in this manner, there is a discontinuous portion between the winding start end and the winding end of the program sheet.

When the rotating drum is rotated endlessly, the detection head detects this discontinuity and sends out an irregularity signal.

In addition, in order to avoid this part, mechanical detection elements are placed at positions corresponding to the winding start end and winding end, and by detecting the winding end, the rotating drum can detect the winding start end. Although it has been done to return to the initial state by rotating it in the opposite direction to the desired position, it has drawbacks such as a complicated structure and a relatively long time.

The present invention solves these drawbacks, and will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the main parts of an embodiment of the present invention, in which 1 is a program sheet, 2 is a cylindrical rotating drum around which the program sheet 1 is wound, and 3 is a drum 2.
Pulse motors 4 and 5 rotate the first and second pulse motors, respectively.
The second detection head 6 is a scale.

A predetermined program curve P is drawn on the program sheet 1, and a continuous mark M is formed on one edge of the program sheet 1 so as to connect the discontinuous part between the winding start end S and the winding end end E. It is provided.

These program curves P and marks M are printed in a color different from the brightness of the program sheet 1 when the detection heads 4 and 5 are configured with optical elements such as light-emitting diodes and light-receiving diodes for non-contact detection. When detecting a change in electrical resistance in a contact state, it is formed by depositing a resistive film on the surface of an insulating sheet and then selectively removing the resistive film.

The detection heads 4 and 5 are composed of elements corresponding to the configuration of the program sheet 1, the program curve P, the mark M, etc., as described above.

The first detection head 4 is movably arranged on the program sheet 1, and the second detection head 5 is fixedly arranged so as to correspond to the mark M.

As a result, the first detection head 4 detects the program curve P, and the second detection head 5 detects the mark M.

FIG. 2 is a configuration explanatory diagram showing an example of the main parts of a specific circuit of the present invention, in which 7 is a servo amplifier, 8 is a balanced motor, 9 is a transmission slide resistor, 10 is a switch, and 11 is an integrator. 12 is a differentiator, 13 is an R-S flip-flop,
14 is an oscillator, 15 is a frequency divider, 16 is a power amplifier, 17
is a frequency division control circuit.

The detection signal S1 of the first detection head 4 is transmitted to the servo amplifier 7
is applied to the balanced motor 8 through a switch 10 and connected to a common potential point via a switch 10.

The balance motor 8 rotates in a direction that makes the deviation signal zero, and the first detection head 4 and the brush 9' of the transmission slide resistor 9
and are displaced in conjunction with each other.

The detection signal S2 of the second detection head 5 is transmitted through a switch 10,
The signal is sent to the integrator 11 and the branch control circuit 18.

The switch 10 is ON-OFF controlled by the detection signal S2 of the second detection head 5.

The integrator 11 has a large difference in charging/discharging time constant and can send out a steep rising pulse, and is configured so as not to send out an error signal when the detection head 5 detects a noise component other than the mark M. ing.

The output signal of this integrator 11 is passed through a differentiator 12 to R-S
It is applied to the set terminal S of the flip-flop 13.

An external start signal Ss is applied to a reset terminal R of the R-S flip-flop 13 via a switch SW, and a Q signal terminal is connected to a frequency division control circuit 17.

An external signal ST for variably setting the frequency division ratio of the frequency divider 15 is also applied to the frequency division control circuit 17 .

The frequency divider 15 divides the constant frequency pulse signal S3 sent from the oscillator 14 based on the control signal Sc sent from the frequency division control circuit 17, and sends the frequency-divided signal S4 to the power amplifier 16. do.

The pulse motor 3 is rotated according to the frequency division signal S, and drives the drum 2 to rotate.

The operation of the device configured in this way will be explained.

In the normal state where the detection heads 4 and 5 face the surface other than the discontinuous portion of the program sheet 1, the first detection head 4
detects the program curve P and its detection signal S1 is, for example, at the "L" level, and since the second detection head 5 is not detecting the mark M, its detection signal S2 is at, for example, the "W" level.

In this state, the switch 10 is turned OFF, the frequency division control circuit 17 sends out a control signal Sc corresponding to a predetermined frequency division ratio based on the eight external signals, and the drum 2 operates at a constant frequency determined by the frequency division signal S4. rotated at speed.

As the drum 2 continues to rotate, the second detection head 5 detects the end of the mark M.

When the second detection head 5 detects the mark M, the signal S2
For example, changes from "4H9" to "L".

The switch 10 becomes
It becomes "ON", the deviation signal of the servo amplifier 7 is forced to zero, the balance motor 8 is stopped, and the output signal of the transmission slide resistor 9 is kept at a constant value.

On the other hand, when the signal S2 reaches the L level, the frequency division control circuit 17 sends the frequency divider 15 a control signal Sc that instructs the transmission of the fastest pulse signal.

This causes the pulse motor 3 to rotate at the highest speed.

During this time, the integrator 11 continues discharging with a relatively long time constant.

Then, when the second detection head 5 finishes detecting the starting end of the mark M and detects the base of the program sheet 1, the signal S2 rises again from "Ltt" to "H99", and the switch 10 changes from "ON" to "H99" again. It becomes “OFF”.

The integrator 11 is charged with a short time constant based on this rise, and generates a steep rise pulse.

The signal of this integrator 11 is differentiated by a differentiator 12 and R-S
It is applied to the set terminal S of the flip-flop 13.

As a result, the signal SQ of the R-S flip-flop 13 becomes H'' level.

When the signal SQ rises to H9l, the frequency division control circuit 17 sends out a control signal Sc that prohibits sending out the frequency division signal S from the frequency divider 15, and stops the pulse motor PM.

This state is maintained until the switch SW is turned ON and the start signal Ss is applied to the reset terminal R to reset the R-S flip-flop 13.

By applying the start signal Ss, the above-mentioned normal state operation is performed.

As is clear from the above, according to the present invention, an irregular signal corresponding to the program curve is not sent out at a discontinuous portion between the winding start end and the winding end of the program sheet, and the discontinuous portion Since the drum is rotated at high speed, the effective time of the program setter can be substantially extended.

In this embodiment, the mark is provided near the edge of the program sheet, but the mark may be provided on the surface of the drum.

Furthermore, a sample and hold circuit may be added to the output terminal of the transmission slide resistor to prevent an abnormal program signal from being sent out when the detection head's servo tracking operation with respect to the program curve deviates.

As explained above, according to the present invention, it is possible to realize a servo-type program setter that is free from the inconvenience caused by the discontinuity between the winding start end and the winding end of the program sheet.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a main part of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of a main part of a specific circuit of the present invention. 1... Program sheet, 2... Song/rotating drum, 3... Pulse motor, 4... First detection head, 5... Second detection head , 6...Tune scale, 7...Servo amplifier, 8...
Balanced motor, 9...Transmission slide resistor, 10
......switch, 11...lJt divider,
12... Differentiator, 13... R-S flip-flop, 14... Oscillator, 15... Quantity frequency divider, 16... Power amplifier, 17...
Frequency division control circuit, P...Program curve, M...
...Mark, SW...Switch.

Claims (1)

[Scope of utility model registration request] A servo configured to cause a detection head driven by a servo system to detect and follow a program curve drawn on a program sheet wrapped around a cylindrical rotating drum, and to send out a program signal corresponding to the position of the detection head. In a type program setter, a continuous mark is provided on a part of the surface of the rotating drum or the program sheet so as to connect the discontinuous part between the winding start end and the winding end of the program sheet, and this mark is detected. The lower portion of the second detection spatula is fixedly arranged as shown in FIG. A servo-type program setting device characterized by keeping the signal at a set value when a mark is detected.