JPS5842343Y2 - Continuous feed rate control device for strip material feeding equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a continuous feed rate control device in a device for feeding a strip of material to a press machine or the like.

As shown in FIG. 1, this type of belt material supply device includes a group of straightening rolls 3 and a pressure feeding roll 4, and a belt material T made of steel, aluminum or other metal is wound around a drum 1. It is equipped with a continuous feeding device 2 that rewinds the paper to straighten the curls and continuously sends out the material, a button and a pressure feeding roll 6, and is operated in synchronization with a press machine 7, and is fed from the feeding device 2. A quantitative intermittent feeding device 5 that intermittently feeds the strip material T into the press machine I by a predetermined amount,
It is arranged on the supply line of the strip material, and furthermore, in order to keep the strip material T slack in case the instantaneous values of the feed speeds of the two feeding devices 2 and 5 do not match, this is done so that the strip material T has a margin. A pit 8 is formed between the two devices 2 and 5.

Inside the pit 8, a level detector 9 is provided, which is composed of photoelectric detectors 9a, 9b, and 9c arranged in three stages in the vertical direction, and detects the lowest end of the slack portion of the strip material T.

The lowermost end of the slack portion of the strip T is a photoelectric detector 9a.

It is desirable that the force be at a level between 9b and 9b. The feeding device 2 feeds out the strip material T continuously, while the feeding device 5 feeds the strip material T intermittently, so the lowest end of the slack portion is photoelectrically detected. It may reach above the detector 9a or below the photoelectric detector 9b.

Therefore, normally, when the lowest end of the slack portion of the strip material T is at the level between the rain detectors 9a and 9b, the feed roll 4 of the feed device 2 is rotated at a predetermined reference speed to raise the level of the detector 9a. When the speed exceeds , the speed of the feed roll 4 is increased,
When the level exceeds the level of the detector 9b, the feed roll 4 is decelerated, and when the level falls below the level of the detector 9c, the feed roll 4 is stopped.

However, since the reference speed of the feed roll 4 is often changed depending on how the press machine I is operated, the reference speed must be made variable, and the signals from the photoelectric detectors 9a and 9b are not detected at each reference speed. It must be possible to speed up and decelerate with ease.

A conventional continuous feed rate control device includes three variable resistors, one of which is used to set a desired reference speed, and the other two variable resistors are used to set the speed when increasing speed and the speed when decelerating. Therefore, in order to change the reference speed for continuous feed, all three variable resistors had to be adjusted, which made the operation extremely tedious.

In view of the above-mentioned circumstances, this invention provides a continuous feed rate control device that can set the reference speed and the speeds during acceleration and deceleration by simply adjusting one variable resistor.

Hereinafter, an embodiment of this invention will be described in detail based on FIGS. 2 and 3.

In these figures, a variable speed drive device 11 that rotationally drives the pinch feed roll 4 of the continuous feed device 2 is composed of a drive motor 12 such as an induction motor that rotates at a constant speed and an electromagnetic joint 13. An output shaft of the feed roll 4 is connected to the feed roll 4 via a speed reduction mechanism.

The electromagnetic joint 13 consists of a drum attached to the rotating shaft of the electric motor 12 and a magnetic pole attached to the output shaft to face the drum. The rotational force of the electric motor 1 is transmitted by the torque generated between the drum and the magnetic pole by excitation by an excitation coil provided in the drum, and by changing the strength of excitation of the magnetic pole, that is, the excitation current value. The rotation speed of the output shaft can be changed by adjusting the slippage between the drum and the magnetic pole.

The actual speed of the output shaft of the electromagnetic coupling 13 is detected by a speed detector 14, such as a speed detection generator, and sent to a feedback circuit 15.

On the other hand, a constant output voltage from a constant voltage circuit 17 is applied to both ends of the variable resistor 16 for setting the reference speed of the feed roll 4 .

The set reference voltage taken out from the slider 16a of the variable resistor 16 is sent to the feedback circuit 15.

The feedback circuit 15 sets the reference voltage and the electromagnetic coupling 13
The voltage difference between the output shaft and the voltage corresponding to the actual speed of the output shaft is detected, and this difference voltage is sent to the trigger pulse generation circuit 18.

A 5CR19 is connected to the excitation coil circuit of the electromagnetic joint 13, and this 5CR19 receives the trigger from the circuit 18.
As a result of the phase control by the pulse, the excitation current of the electromagnetic joint 13 is controlled so that the voltage difference becomes zero.

Now, an increase/decrease controller 20 is connected in series to the reference speed setting variable resistor 16 or to the slider 16a of the variable resistor 16.

A for each of these. Indicated by B.

This controller 20 consists of resistors 21, 22 connected in series and relay contacts 23, 24 connected in parallel to these resistors 21, 22, respectively.

The contact point 23 is located at the bottom end of the slack part of the strip material T, which is the photoelectric detector 9.
When the level of a is exceeded above, it turns on and the contact 24
turns on when the lowest end exceeds the level of the photoelectric detector 9b.

In the case where the controller 20 is connected between the positive terminal of the constant voltage circuit 17 and the variable resistor 16 (point indicated by A), the lowest end of the slack part of the strip material T is connected to the rain detector 9a.
, 9b, the contact 23 is off, the contact 24 is on, and the resistor 21 is connected in series to the variable resistor 16.

The voltage that appears on the slider 16a (point a) at this time is the set reference voltage.

When the lowest point exceeds the level of the detector 9a, the contacts 23 and 24 are both turned on and both resistors 21 and 22 are short-circuited, so the voltage at point a is slightly increased, and the feed roll 4
The rotational speed of is increased.

Conversely, when the lowest point exceeds the level of detection i9b, both contacts 23 and 24 are turned off, the voltage at point a decreases slightly, and the rotational speed of feed roll 4 is reduced.

In the case where the controller 20 is connected between the slider 16a of the variable resistor 16 and the input terminal (point b) of the feedback circuit 15 (point indicated by B), the controller 20
The voltage drop due to the current flowing through the controller 20 changes depending on the resistance value of the controller 20, so even if the voltage at point A is constant, the voltage at point B changes depending on the resistance value of the controller 20. .

When the lowest end of the slack portion of the strip T exceeds the level of the detector 9a, the resistance value of the controller 20 is zero, so there is no voltage drop and the voltages at points a and b are equal.

This corresponds to a speed increase stage of the feed roll 4.

When the lowest point exceeds the level of the detector 9b, the resistors 21 and 22 are inserted between the points a and b, so both resistors 2
1.22 occurs, and the voltage at point b becomes lower than that at point a.

This corresponds to the deceleration stage of the feed roll 4.

When only the resistor 23 is inserted, the vehicle is operating at the set reference speed.

The reference speed of the feed roll 4 is determined by the slider 16 of the variable resistor 16.
It can be arbitrarily set by sliding a.

It will be understood that the speeds for speed increase and deceleration are automatically set for each of the set reference speeds by turning on and off the contacts 23 and 24 of the controller 20.

The controller 20 only needs to be connected to either A or B.

The maximum and minimum currents that can be passed through the variable resistor 16 are often determined by the characteristics of the constant voltage circuit 17, and when the controller 20 is connected to the point A, the value of the resistor 21.22 is generally You can't make it any bigger.

When the controller 20 is connected to the location B, the voltage drop caused by the controller 20 can be made relatively large, and in the case B, the speed variable range can be made larger.

As described above, according to this invention, there is no need for the trouble of adjusting at least three variable resistors as in the conventional method, and the reference speed, acceleration speed, and deceleration speed can be adjusted by adjusting only one variable resistor. can be set up and is extremely easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of a belt material supply device, FIG. 2 is a circuit diagram showing a continuous feed rate control device, and FIG. 3 is a circuit diagram showing an increase/deceleration controller. 16... Variable resistor for standard speed setting, 16a.
...Slider, 20...Increase/deceleration controller, 2
1, 22...Resistor, 23, 24...Relay contact (switching means).

Claims (1)

[Scope of utility model registration request] A control device that sets a reference speed using a variable resistor, and includes a plurality of resistors connected in series and switching means for increasing and decelerating control connected in parallel to each of these resistors. , a continuous feed rate control device in a strip feeder, connected in series with the variable resistor or to a slider of the variable resistor.