EP0633333B1 - Control arrangement for controlled blowing out a rectilinear comb - Google Patents

Description

The invention relates to a control device according to the Preamble of claim 1.

In combing machines is in the usual way in the area of the forceps opening Pliers aggregate attached a fixed comb. Through the needles of this Fixed comb is particularly during the tear-off process by the tear-off cylinder the rear part of the torn fiber beard pulled. This will ensures that the rear part of the stripped fiber beard, the is not caught during the combing process by the circular comb, is combed out. The fixed comb holds those that remain in the stripped fiber beard Contaminants such as shell parts, nits and others Impurities back.

Parts of these contaminants fall down into the suction channel of the Round comb and are disposed of there. The rest of these impurities can occur on or between the machines during machine operation Deposit fixed comb needles. This leads to an impairment of the effectiveness the fixed comb.

There are therefore various mechanical stripping elements in practice, such as for example scraper plates or brushes, to remove these deposits been proposed. However, these mechanical devices are on the one hand very complex and increase the weight of the pliers and on the other hand in limited their effectiveness.

Therefore, as can be seen, for example, from JP-A-35-14 16 Pneumatic cleaning devices proposed that the fixed comb clean with compressed air in the area of the needles. The described JP-A-35 14 16 has in addition blow nozzles, which from outside and across to the fixed comb needles blow. From DE-PS 37 22 481, which is the closest to the invention shows upcoming state of the art, an embodiment is known, the Compressed air for cleaning directly between the needles or pinstripes in Longitudinal direction of the needles is supplied via a compressed air duct. Thereby it is ensured that the compressed air covers the entire space between reached the needles and thus freed of deposits that go down be blown out. In the last described embodiment proposed to time the compressed air pulses so that the blown out impurities by the subsequent working cycle of the Round comb can be taken. It is suggested the air pulses depending on the comb play or the movements of one if necessary assigned pliers, or another coordinated driven machine element of the combing machine. this will preferably via a purely mechanical or an electromechanical Establishment carried out. As an alternative, it is proposed that Trigger air supply by a timer.

In practice, it is common nowadays to use the combing machine with up to 360 Allow combing to run per minute. That means a comb game takes place during 0.167 seconds. During a quarter of that time, that is takes 0.04 seconds at the corresponding angular position of the Round comb the actual blowing interval takes place. As from the previously described Taking time intervals, is sent to the control of the compressed air unit or on the control of their valves, very high demands to be met exact blowing interval. This is therefore necessary to technological disadvantages with too early or too late blowing interval too avoid. This exact setting, especially the beginning of the Blow interval is with the conventional mechanical or electromechanical Funds can only be carried out to a limited extent, especially since these facilities on the one hand have different tolerances and on the other one have some inertia.

The invention is therefore based on the object of providing means which an exact setting even with today's high number of combs of the blowing interval.

This task is accomplished by moving the pliers or a other machine element coordinated with the movement of the tongs is tapped by sensors and by the sensors emitted signals a microprocessor to control the Blow-out device are transmitted, which is based on a predetermined Program and, using the means provided, an exact setting of the Blow interval allows. This means, for example, that the corresponding valves for releasing the compressed air to a precisely defined one Opening or closing time. In particular, the Inertia of the valve can be taken into account in the simplest way. Likewise it using a microprocessor and provided means very simple, the delay time of the air on the way from the valve to the Take the exit area between the needles into account in the control.

By using a microprocessor to control the blow-out device on the basis of a program and appropriately planned means it is possible, appropriate framework conditions, such as blowing time, Blow interval and blow intensity based on a specified number of combs adjust, with an exact time delivery of the compressed air pulse is guaranteed.

It is preferably proposed that the sensor for scanning the Forceps movement or another coordinated with the forceps movement driven machine element attached in the area of the round comb shaft is, which taps a predetermined angle of rotation of the round comb shaft.

As already described, the blow-out device is also proposed a predetermined lead time in relation to the time of blowing and in To determine dependence of the number of combs.

To adapt to different tolerances or comb play numbers is the Lead time adjustable.

The air pressure of the blow-out device can also be controlled via the microprocessor be controlled accordingly.

In practice, it is common to do so after a certain time interval, for example from 30 minutes, the machine over a short period of time at a slow speed switch back to increase the cleaning intensity. That is, during The slow action of the machine becomes the scraping effect of the round comb brush for combing out the round comb increased because the round comb brush their original speed that was present during the overdrive of the machine, maintains while the speed of the circular comb is reduced. Moreover the suction effect of the suction fan is also not changed. Thereby the cleaning intensity during slow walking is increased. To also the To increase cleaning effect of the blow-out device for the fixed comb suggested changing the air pressure to the cleaning interval during the Adapt slow speed. This means that the air pressure can Slow speed phase changed, e.g. may be increased to to remove stubborn deposits from the fixed comb area.

It is also proposed that the duration of the blowing interval depending on the Comb play number adjustable or preselectable. This allows all machines or material-related influences depending on the Comb play number can be taken into account in the simplest way.

Through the further proposal, the pressure build-up of the air in the blowing device to monitor via a sensor and the control device Submit a means is proposed that allows the system to self-monitored. This means that the actual value of the Pressure build-up can be achieved by comparing the actual value / setpoint in the Control device to be corrected. This also allows internal tolerances or deviations in the system are compensated and the exact setting of the Blow intervals are guaranteed automatically.

Further advantages are shown in the following exemplary embodiment described and shown.

Fig. 1

einen Teilausschnitt aus einer schematischen Seitenansicht eines Kämmaggregates,

Fig. 2

ein Diagramm Luftdruck/Zeit zur Darstellung der Blasimpulse,

Fig. 3

eine schematische Seitenansicht eines Rundkammes mit zeitlicher Darstellung des Blasintervalls.

Show it:

Fig. 1

1 shows a partial section from a schematic side view of a combing unit,

Fig. 2

a diagram of air pressure / time to represent the blowing impulses,

Fig. 3

is a schematic side view of a round comb with time representation of the blowing interval.

In Figure 1 is a pair of pliers 1 with lower pliers 2 and upper pliers 3 shown. The upper tongs 3 are about a pivot point 4 on the lower tongs 2 pivotally mounted. In front of a pliers plate 5 of the top pliers 3 is a Fixed comb 6 attached, via a web 7 with the pliers 2 is detachably connected. The fixed comb 6 can accordingly the embodiment according to DE-PS 39 37 899 with an air duct 8 and corresponding ones, not shown here Compressed air channels, be formed between the needles 9. On the compressed air duct 8 is connected to a pressure line 10, via which via a valve 11 from a compressed air source 12, Compressed air can be supplied. The valve 11 is a Switch 13 actuated, which via a control line 14 from a microprocessor 15 is controlled. The microprocessor 15 is via a further path 16 with a display and Input unit 17 connected. Furthermore, it is indicated schematically that a corresponding one on the microprocessor 15 Control program 18 is loaded.

A circular comb 19 can be rotated below the pliers unit 1 stored, which on part of its circumference with a Comb segment 20 is provided. On the round comb shaft 21 an index disc 22 attached to which the current Angle of rotation position tapped via a fixed sensor 23 and transmitted to the microprocessor 15 via a path 24 can be.

The pliers unit 1, which moves back and forth during operation is mechanical with the drive of the round comb 19 coupled so that the respective position of the pliers unit in relation to the angular position of the comb segment 20 is precisely coordinated.

In the example shown in Figure 1, the pliers unit is located 1 in its rearmost position, in which it is closed and the fiber beard protruding from the pliers 30 a cotton wool supplied via a feed cylinder 31 32 is presented to the comb segment 20 for combing out. After this combing process moves the pliers unit 1 in Direction of the tear-off cylinder 33, during which Moving the pliers opens. That between the tear-off cylinders existing and combed fiber fleece 34 is through a reversing movement of the tear-off cylinder by a certain one Funded back. The one from the pliers unit 1 protruding and combed fiber beard 30 moves due to the resolution of the clamping effect upwards and comes with the returned nonwoven 34 in contact. At this At the same time he moves between the fibers the needle 9 of the fixed comb 6. Now the direction of rotation of the Tear-off cylinder 33 reverses again and the nonwoven fabric 34 subtracted forward. This happens during this peeling process front end of the fiber beard 30 in the clamping area of the Tear-off cylinder 33, whereby the fibers of the fiber beard 30, which is not retained by the cotton 32 in the forceps unit 1 be pulled out of the cotton 32 and with the nonwoven fabric 34 is soldered or connected. With this Tear off is especially the rear part of the Fiber beard 30, which is not by the comb segment 20 was detected, pulled through the needle 9 of the fixed comb 6. This ensures that even in the rear Part of the fiber beard 30 impurities, such as shell parts, Nits and the like are combed out.

Some of the contaminants that are stripped off are removed by the suction air flow S of a suction channel 35 is sucked down. In this suction channel 35 is located below the Round comb 19 a rotating brush 36, which is used for cleaning of the comb segment 20 is provided.

The components not released and stripped down remain partly on or between the needles 9 of the Fix comb 6 hang, and would be one if not removed Impairment of the subsequent combing process in the fixed comb 6 lead. The fixed comb 6 is therefore, as already described with compressed air channels or with an air channel 8 provided, via which compressed air between the needles 9 after is blown down. This will get the stuck Impurities are blown out and the fixed comb for the subsequent one Combing process cleaned.

The compressed air, which is emitted from a compressed air source 12, reaches the air channel 8 of the fixed comb 6 via a valve 11 and a line 10.
In order not to negatively influence the combing and soldering process by the compressed air supply, it is necessary to control the compressed air supply at a precisely defined time and in a precisely defined time interval. This control is carried out by a microprocessor 15, which controls a switch 13 to open the valve 11 via a path 14. As described in more detail below, the compressed air pulse is applied to the needles 9 in a time interval after the drawn-off fiber beard 30 has passed the needles 9 and before the comb segment 20 sticks into a newly adjusted fiber beard 30. However, it is conceivable that in order to push the new fiber beard 30 into the comb segment 20, the pressure pulse is maintained for a short time after the comb segment 20 has pierced the fiber beard 30. However, this depends on various framework conditions, such as fiber material, stack length, climate, etc.

In order to carry out the switching time of valve 11 exactly, the microprocessor 15 receives a signal via the line 24 from a sensor 23, the angular position of the round comb 19 taps over an index disk 22. However, it is possible other tapping systems for determining the respective To use the angular position of the round comb.

In order to monitor the compressed air build-up, line 10 a sensor 37 attached, which its actual value signals line 25 transmits to microprocessor 15. In the microprocessor 15 a setpoint / actual value comparison can then take place and any deviations corrected by the following Control can be compensated.

FIG. 3 schematically shows a side view of the circular comb 19 with the comb segment 20. The entire circumference of the circular comb 19 is divided into a forties index. This division corresponds to the division on the index disk 22. The index disk 22 is connected in a rotationally fixed manner to the round comb shaft 21 and runs past the fixed sensor 23. To determine the point in time of a particular index position, either all index markings can be tapped individually by the sensor 23 or only one index can be tapped and another index position can be calculated via the rotational speed of the shaft 21. In the present example, the tap corresponds to index I24 or the foremost position of the pliers unit 1. As soon as index I27 is tapped or calculated on index disk 22 during the backward movement of the pliers, the compressed air is blown out between needles 9 for cleaning during the time interval t _B . The blow-out process in the example shown begins at time T _B at index I27 and ends at index I34.

In order to take into account the inertia of the valve 11 or the switch 13, including the electronic switching time, it is necessary to trigger the activation process by the microprocessor 15 already at time T. This ensures that the compressed air gets between the needle 9 exactly at the time T _B.

As shown in FIG. 2, a compressed air pulse is carried out at a time interval of t _B during the comb games at a time interval of t _K.

However, it is also conceivable to apply the compressed air pulses only every other comb play or at other intervals. This can be preset in a very simple manner by using a microprocessor 15 via a control panel 17. In addition, the blowing time T _B can be precisely specified or set via the control panel 17 of the control via the microprocessor 15. As a result, the blowing interval can be easily adapted to changeable general conditions, such as material, climate, stack length and the like. The position of the blowing interval in relation to one revolution of the circular comb is only one possible variant in the example shown. A shifting of the blowing interval is also conceivable depending on the application.

During the operation of the combing machine, it is customary to carry out a cleaning interval in slow speed after a certain set time (e.g. 30 minutes). For example, the combing machine is brought down to about 1/9 of the normal number of combs, the speed of the separately driven brush 36 being kept at its operating speed and the power of the suction air S being maintained. As can be seen from the diagram in FIG. 2, the blowing time in t _B1 increases at the time T _{L of} the slow gear. In order to intensify the cleaning during the slow cycle, which lasts for 10 seconds, for example, the pressure of the air pulse is increased from P1 to P2 in the present example. This makes it possible to remove stubbornly adhering dirt from the area of the needles 9. During the slow speed, the time interval t _K1 between the individual blowing pulses also increases. As soon as the machine is switched back to overdrive, the blowing intervals are adjusted to the overdrive again.

By designing the program 18 accordingly different framework conditions for blowing out via the display and input unit 17 can be selected.

The use of the microprocessor to control the blow-out device enables an individual, exact and pre-selectable blow-out of the fixed comb needle 9.

Claims (9)

1. A control device for the controlled blowing out of a needle strip, in particular a top comb (6) of a combing machine, by means of a blow-out apparatus (8, 10, 11, 12, 13), through which compressed air is blown in intervals between the free passages of the needle strip (9) and the blow-out apparatus (8, 10, 11, 12, 13) is initiated by the movement of the nippers (1) during a nip of the comb or any other machine element (19) of the combing machine which is driven in a coordinated manner with the nipper movement, characterized in that the movement of the nippers (1) or any other machine element (19) which is driven in a coordinated manner with the nipper movement is detected by sensors (23) and the signals issued by the sensors (23) are transmitted to a microprocessor (15) for the purpose of driving the blow-out apparatus (8, 10, 11, 12, 13) which allows a precise setting of the blowing interval on the basis of a predetermined program and on the basis of predetermined means.
2. A control device as claimed in claim 1, characterized in that the angle of rotation of the circular comb shaft (21) is scanned.
3. A control device as claimed in one of the claims 1 to 2, characterized in that for driving the blow-out device (8, 10, 11, 12, 13) the control pulse from the microprocessor (15) occurs with a predetermined lead time (t) with respect to the blowing time (T_B) and depending on the count of the combing cycle.
4. A control device as claimed in claim 3, characterized in that the lead time (t) is adjustable.
5. A control device as claimed in one of the claims 1 to 4, characterized in that the air pressure of the blow-out device (8, 10, 11, 12, 13) is adjustable.
6. A control device as claimed in claim 5, characterized in that the adjustment of the air pressure is made on the basis of a predetermined interval with respect to the running time of the machine.
7. A control device as claimed in claim 6, characterized in that a first air pressure (P1) is switched on during the rapid movement of the combing machine and a second, altered air pressure (P2) is switched on after a predetermined interval during the slow movement of the combing machine.
8. A control device as claimed in one of the claims 1 to 7, characterized in that the duration of the blowing interval can be adjusted depending on the count of the combing cycle, or that (T_B) is preselectable.
9. A control device as claimed in one of the claims 1 to 8, characterized in that the course of the pressure build-up in the blow-out apparatus (8, 10, 11, 12, 13) is measured through a sensor (37) and is transmitted to the control device.

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