JPH0555619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention resides in the following claims:
In particular, it relates to a device for storing, feeding and measuring weft threads for jet looms.

DE-A-3123760 discloses a device for accumulating, feeding and measuring weft threads for a jet loom having a stationary accumulation drum, on which an intermediate weft accumulation is wound by a winding device and in which the weft yarns are being withdrawn from the storage drum in a pivoting manner around its withdrawal end, a weft yarn detection means is provided to pass through the detection area of the weft yarn while it is being withdrawn from the drum, said weft yarn detection means generating a pulse signal;
Each pulse signal is indicative of a weft thread passing through the detection area of the weft thread detection means, and a plurality of weft thread stops are provided at angular intervals around the storage drum, said weft thread stops comprising a weft thread stop element and said stop element. actuator control means are provided, comprising actuating means for moving the weft thread into and out of the path of the weft thread to be drawn out, and furthermore actuator control means are provided which can be adjusted to the desired weft thread length to be drawn out, said control device controlling the actuating signal to stop the selected weft thread; responsive to the pulse signal to be sent to a device;
The angular position of this weft thread stop corresponds to the position given by the weft thread when said desired weft thread length is drawn out. The weft thread detection means of this prior art device consists of a plurality of weft thread sensors, each of said sensors being associated with a weft thread stop device. The number of weft thread sensors required for such prior art devices therefore corresponds to the number of weft thread stop devices. A device for storing, feeding and measuring weft threads of the type described above serves not only to intermediately store the weft threads in the storage drum, but also to supply the jet loom with weft threads of the desired length. For the latter purpose, this prior art device performs the following steps to obtain the desired weft thread length for each weft thread insertion. After releasing or deactivating the weft thread stop device which was activated at the end of the previous weft thread withdrawal cycle, the weft thread is withdrawn in a pivoting manner around the withdrawal end of the storage drum. Thereby, the weft thread successively passes through the detection areas of a plurality of weft thread sensors which are arranged in mutually spaced angular relation at the draw-out end of the storage drum. Each weft thread sensor generates pulse signals indicating that the weft thread passes through its detection zone, and these pulse signals are fed to a control device. The control device therefore receives several pulse signals, the number of which corresponds to the number of weft thread sensors passed by the weft thread during withdrawal. By counting the pulse signals received from the weft thread sensor, the control device generates a count value corresponding to the actual position of the weft thread withdrawal point with respect to the weft thread sensor. This count corresponds to the length of the weft yarn drawn off from the storage drum. When the counted value corresponds to the desired weft thread length to be withdrawn, the control device activates a stop device located after the weft thread sensor which generated the last pulse signal with respect to the angular movement of the weft thread withdrawal point. Thereby, the withdrawal of the weft thread is stopped and the desired weft thread length is obtained. This prior art device is expensive and complex due to the large number of weft stop sensors required to obtain a sufficiently large number of different weft lengths. Furthermore, it is not possible to have a large number of weft thread sensors due to the fact that the equipment for accumulating, feeding and measuring such weft threads must be designed as compact as possible in order to meet the technical requirements of the customers and users of the equipment. Undesirable. Another disadvantage is due to the fact that the weft thread sensor usually consists of an optical element that can be covered with lint and is therefore susceptible to damage in moving conditions. If one of the plurality of weft thread sensors is covered with lint, it will no longer generate a pulse signal when the weft thread passes through its detection zone, resulting in an erroneous count value for the control device. Therefore, the weft length of each inserted weft thread is greater than the desired weft length.

DE-A-3123760 or accumulating the weft yarn using only one detection sensor for detecting the withdrawal of a complete turn of the weft yarn at the withdrawal end of the drum;
A dispensing and measuring device is disclosed. In order to be able to adjust the weft length to be drawn out,
This prior art device uses a drum whose diameter can be changed mechanically. The same concept is FR−A2166332
and PCT-A-WO82/04446. Mechanical adjustment of the drum diameter requires complex mechanical means making the device expensive and prone to failure.

The present invention seeks to improve a device of the type described above so as to give it a simpler and more cost-saving construction and a more reliable function without giving up the advantage of being able to adjust the length of the weft thread to be drawn.

This problem is solved in the device mentioned as having the features of claim 1.

The control device of the device for storing, feeding and measuring weft threads according to the invention includes means for storing information regarding the weft thread stop device activated at the end of the previous weft thread withdrawal cycle. This allows the control device to have information about the withdrawal point of the weft thread to be withdrawn at the beginning of each withdrawal cycle without requiring a weft thread sensor associated with each weft thread stop device. Based on the information for the calculation means representing the desired weft thread length, which can be provided as a simple BCD switch connected to this calculation means,
Furthermore, based on the stored information regarding the stop device activated at the end of the previous weft thread withdrawal cycle, one of the weft thread stop devices to be activated next from the plurality of weft thread stop devices is determined. This new idea is such that the device according to the invention does not require any extra information regarding the withdrawal of the weft thread, and after releasing the stop device activated at the end of the previous withdrawal cycle, the release of said released stop device and the weft thread sensor During the movement of the weft thread during its passage through the detection zone, it is possible to determine which weft thread stop device is to be activated next. This principle allows the number of weft thread sensors to be reduced substantially, since the number of weft thread sensors becomes independent of the number of weft thread stops.

According to claim 2, the weft thread detection means can be realized as a single weft thread sensor, resulting in a device of very simple construction, and furthermore because the control device connects the weft thread sensor to the calculation means. The use of one input/amplifier circuit provides a control device with simple circuit design.

The device according to claim 3 provides information about the stop device activated at the end of the previous withdrawal cycle, which can be used directly as a basis for determining the weft thread stop device to be activated next. Use. Preferably, this stored information may be a number of the stop device indicating its angular position relative to said weft thread sensor. Furthermore, it is possible to use the value of the angle between the lowering device and the weft thread sensor as stored information. Based on such stored information, determining the next stop to be activated can be performed by converting the desired weft thread length into a stop device position number, and determining the next stop to be activated. Therefore, the number of stops activated at the end of the previous withdrawal cycle and the number representing the desired weft thread length are summed, but when this sum exceeds the total number of stops, the number corresponding to a complete turn of the weft thread is added. , i.e. the total number of stopping devices.

The calculation means of the preferred device according to claim 4 carry out a very quick and reliable determination of the moment of actuation of the determined stop device. For this purpose, the calculating means determines, on the basis of the desired weft thread length, the operating position of the withdrawal point of the weft thread from the storage drum at which the determined stopping device is to be activated. In order to obtain a time reference corresponding to the actual withdrawal speed of the weft thread from the storage drum, the calculation means measure the time between two consecutive pulse signals generated by the weft thread sensor. On the basis of this information, the calculation means are adapted to carry out an estimation regarding the withdrawal point of the weft thread being withdrawn from the storage drum for the respective position of each weft thread stop device. The calculation means actuate the determined stopping device as soon as the calculated, ie approximated, instantaneous position of the withdrawal point is equal to the determined actuation position. A rough approximation of said actuation position resulting in a determined point of time for actuation of the device is:
It is sufficient that the determined stopping device can be activated as soon as the withdrawal point of the weft thread has passed the stopping device by one complete turn before being stopped by the stopping device.

A very reliable operation of the device can be obtained when the calculation means are designed to carry out the calculation steps indicated in claim 5 for determining the approximate instantaneous position of the withdrawal point of the weft thread. At the beginning of each withdrawal cycle, the calculated instantaneous position was set to a value corresponding to the previously activated stop position. After releasing the previously activated stop device,
This value is increased at a predetermined rate.

Preferably, this proportion is chosen such that the calculated instantaneous position is shifted forward with respect to the actual position of the withdrawal point of the weft thread. While incrementing said calculated instantaneous position, the calculating means repeatedly checks whether the instantaneous position is equal to the position of any one weft thread sensor or whether the calculated instantaneous position is equal to the operating position. When the first condition is fulfilled, the calculating means retains the calculated instantaneous position;
Check whether the weft thread sensor generates a pulse signal. By adaptively choosing a predetermined proportion for the increment of the calculated instantaneous position, the calculating means retains the calculated instantaneous position and provides a time window for checking whether the weft thread sensor generates a pulse signal. It is only checked whether the weft yarn accumulation sensor generates a pulse signal during a very short period of time, which can be considered as . This allows the calculation means to work with high reliability, since noise peaks that may occur before and after the opening and closing of the time window are ignored. Since the occurrence of said pulse signal indicates that the calculated instantaneous position is equal to the actual position of the withdrawal point of the weft thread, the calculating means increments the calculated instantaneous position as soon as it receives the pulse signal generated by the weft thread sensor. Continue the calculation further with the following steps. As soon as the instantaneous position of the withdrawal point of the weft thread is equal to the actuating position, the calculation means actuate the determined stopping device by supplying it with an actuating current.

By taking advantage of the intended advantages as claimed in claim 6, a device for accumulating, feeding and measuring high-speed weft threads which typically draws the weft threads from an accumulation drum at a rotational speed of about 10 milliseconds per revolution. Even when using relatively slow stopping devices, it is ensured that the determined movement of the stopping elements of the stopping device is completed. More particularly, the operating position of the withdrawal point of the weft thread being withdrawn from the storage drum is determined by the time elapsed during the movement of the withdrawal point from said operating position to the determined position of the stopping element of the stopping device. More preferably 1-
5 milliseconds, said response time being defined by the time delay between the supply of actuation current to the actuator means of the stop device and the completion of the movement of the stop element. With a response time of 5 milliseconds, the stopping device is therefore activated 6 to 10 milliseconds before the withdrawal point of the weft thread reaches the determined position of the stopping element of the stopping device.

Claims 4 to 6 count how the calculated instantaneous position of the withdrawal point of the weft thread is used as a reference for activating the determined stopping device at the appropriate time. On the other hand, in detail, these claims provide that the calculation means approximates the position of the withdrawal point of the weft thread;
Furthermore, it is described how to control the actuation to a determined stop position to be actuated next by periodically correcting said position each time the weft thread sensor generates a pulse signal.

Claims 7-9 contain a modified teaching when compared with claims 4-6 in that the calculation of the instantaneous position of the extraction point is replaced by a time calculation. In each of these two cases, the calculation means may be a simple standard microprocessor adapted for these purposes by a few interface circuits and a short program for carrying out the respective calculations.

According to claim 7, the calculation means define the time between the release of the stop device actuated at the end of the previous withdrawal cycle and the actuation of the determined stop device to be actuated next. The run time is determined based on the desired weft thread length. Since there is a linear dependence between the desired weft thread length and the working time, information regarding the desired weft thread length can be used as a basis for calculating the working time. Calculating means calculates the time elapsed since the release or deactivation of said stop device activated at the end of the previous withdrawal cycle and further calculates this time calculation by two consecutive pulse signals received from the weft thread sensor. periodic corrections based on the respective times between. By doing so, the time calculations can be adapted to the varying speed of drawing the weft thread from the displacement drum. In other words, the respective time between two consecutive pulse signals serves as a time reference for the calculation of the time that has elapsed since the release or deactivation of the actuated stop device at the end of the previous withdrawal cycle. As soon as the calculated time corresponds to the determined activation time, the calculation means generates an activation signal for activating the activation means of the determined stopping device.

By designing the calculation means as claimed in claim 8, the calculated time that has elapsed since the release or deactivation of the actuated stop device at the end of the previous withdrawal cycle is the amount of time that has elapsed since the withdrawal from the storage drum. can be considered to represent the instantaneous or angular position of the weft thread withdrawal point. By doing so, the generation of one pulse signal for each revolution of the weft thread being withdrawn from the storage drum is sufficient to generate information regarding the path of the withdrawal point.

When the calculation means of the device are designed as claimed in claim 9, it is possible to easily and reliably calculate the calculated time with respect to the period between two consecutive pulse signals generated by the weft thread sensor. A correction is accomplished. Preferably, the computing means is a microprocessor with memory. That one storage cell stores a calculated value representing the calculated time. At the beginning of each cycle said value is reset to zero by said calculation means when releasing or deactivating the stop device which was activated at the end of the previous withdrawal cycle. Hereinafter, the calculating means increments said value by a predetermined ratio, and determines whether said value is equal to the operating time;
Or periodically check whether the value is equal to the presented period. This preset time is a few percent, preferably 10%, of the time that elapses during the withdrawal of one turn of the weft thread from the storage drum.
% is selected smaller. Furthermore, the calculating means checks whether said value is equal to said preset time multiplied by n. nh is an integer greater than zero. By doing so, the calculation means detect whether said value is equal to a multiple of the time that elapses during the withdrawal of one turn of the weft thread from the storage drum. If the value is equal to the actuation time, the calculation means generates an actuation signal. If said value is equal to the preset time or a multiple thereof, the calculation means retain said value and check whether the weft thread sensor generates the next pulse signal. By doing so, the calculation means generates a time window during which it is checked whether the weft thread sensor generates the next pulse signal. This feature reduces the sensitivity of the device with respect to noise peaks, since the signal received from the weft sensor is only considered during a very small time window in which pulses are expected to appear. As soon as a pulse is detected, the calculation means further carry out the calculation with respect to said increments as described above.

Since the calculation means according to claims 4 to 9 generate information regarding the instantaneous withdrawal point of the weft thread on the storage drum, the calculation means also generate information regarding the instantaneous length of the weft thread being withdrawn. have information This information regarding the instantaneous length of the weft thread being withdrawn can advantageously be used to control further operations of the jet loom which must be carried out independently of the instantaneous length of the weft thread being withdrawn from the storage drum. . Preferred devices for using said information are set out in claims 10-12.

Typically, equipment for jet looms has a jet nozzle for inserting the weft thread during the weaving process with compressed air, the jet of compressed air generated by the jet nozzle being used to supply compressed air to said nozzle. It can be controlled by a solenoid valve that can be operated by a drive current to control. Normally, the control of the solenoid valve has been performed in synchronization with the rotation of the main shaft of the loom. In such a control, the opening of the valve for supplying compressed air to the jet nozzle occurs during the withdrawal cycle to ensure that the jet of compressed air is fully established before deactivation of said stop device. must be carried out for a relatively long time before deactivating the activated stop device at the end of the period. This relatively long time was necessary due to the fact that there is no direct synchronization between the operation of the feeding device and the jet loom. For the same reason, the jet nozzle valve is closed for a relatively long time after actuating the next stop device at the end of the drawing cycle.
Since the energy for generating compressed air has increased substantially in recent years, it has become desirable to reduce the consumption of compressed air as much as possible.

Claims 10 to 12 provide an advantageous method for effectively reducing the consumption of compressed air by controlling the solenoid valves by calculation means in a time-dependent manner on the actuation of the respective stop device. 4- Teach how to use the information regarding the drawn-off weft yarn length contained in the calculation means of the device according to paragraph 9;

According to claim 11, the consumption of compressed air is reduced by closing the valve of the jet nozzle for a predetermined period before activating the determined stop device to be activated next. By suitably selecting this predetermined period, the tension in the weft thread drawn off from the storage drum is substantially reduced just before actuating the stop device. By doing so, the actuation force of the stop device is also substantially reduced, allowing the use of smaller, faster and cheaper stop devices.
By reducing the tension on the weft thread just before the withdrawal is stopped by the actuated stop device, it is possible to dispose of fragile and weak weft threads.

When implementing the device according to claim 12, the desired tension in the weft thread is established by means of a jet of compressed air when the stop device activated at the end of the previous drawing cycle is deactivated, so that the weft thread is The tension is immediately reduced just before actuating the next stop device, so that an optimal time dependence between each activation and deactivation of the stop device and between each opening and closing of the jet nozzle valve is achieved. sex is achieved.

When implementing the device according to claim 13, a very simple and cost-saving design can be obtained.

Preferred embodiments of the invention will be described below with reference to the accompanying drawings.

1 shows a partially sectional side view of the device according to the invention, FIG. 2 shows a front view of the device shown in FIG. 1, and FIGS. The details of the apparatus shown in FIG. 5 are shown in FIG.
6 shows a circuit diagram of the control device of the apparatus shown in the figure, and FIG. 6 shows a flowchart used in the microprocessor of the control device shown in FIG.

Referring to FIG. 1, a feeding device 1 is shown consisting of a storage drum 2, a winding device 3 or a swiveling feeder tube 3 and an electric motor 4. Swivel feeder tube 3 driven by electric motor 4
The weft thread F fed to the storage drum 2 is wound around the storage drum 2. This storage drum is connected by magnetic means (not shown)
It is a stationary storage device that is held in a stationary position relative to its surroundings by. Devices of this type are known per se. For the purpose of this disclosure, this technology is
It should be noted that this is exemplified by -PS3776480 and US-PS3843153. Supply device 1
is provided with an accumulation sensor 5 located close to the generally cylindrical surface of the accumulation drum. This accumulation sensor 5 may preferably be a so-called maximum sensor consisting of a light-emitting device and a light-detecting device. This accumulation sensor 5 generates a signal indicating the amount of weft yarn stored on the drum, ie the number of turns of the weft yarn wound around the drum. Based on this signal, the storage control device 7
controls the operation of the electric motor 4 such that there is continuously a sufficient amount of weft thread available on the weft thread storage drum 2. The storage control device 7 is known per se.
For the purpose of this disclosure, this technology is referred to as DE-OS2908743, FR
-A-1562223 and PCT/EP83/00121 (applicant's own).

As shown in FIG. 1, a weft thread detection means 6 is provided at the draw-off end of the storage drum, arranged such that the weft thread passes through its detection area while being drawn out from the drum 2. The weft thread detection means preferably consist of a single weft thread sensor, each of which generates a pulse signal indicating that the weft thread F passes through the detection range of the weft thread sensor 6. This sensor 6 can also be located in front of the withdrawal end of the storage drum, but must be arranged such that the weft thread passes through its detection area while being withdrawn from the storage drum 2. The weft thread stop device 10, which is placed at the draw-out end of the storage drum 2, consists of an actuator device 11 consisting of a plurality of electromagnetic coils 11 and a plurality of coil cores 12, each of which has two coils covering these electromagnetic coils. It is wrapped around a coil core 12 supported by a balloon defining ring 13 consisting of two U-shaped rings. Said balloon limited ring 13
are fixed around the periphery of the feeding device 1, for example on its base plate. An annular guide 16 is connected to the draw-out end of the storage drum 2. Said guide part 16 supports a plurality of weft thread stopping elements 14, each of said weft thread stopping elements 14 consisting of a metal ball 14 movably arranged in a radial hole 15 provided in the guide part 16.

As shown in FIGS. 3 and 4, each electromagnetic coil 11 and associated core 12 are placed opposite said hole. Balloon defining ring 13 and guide 16 define a gap 18, preferably on the order of 1-2 millimeters. The weft thread F passes through said gap as it is withdrawn from the storage drum.
A permanent magnet 17 is provided at one end of each hole 15 in order to move the metal ball 14 back into the hole 15 after the operating current supplied to each electromagnetic coil has been cut off. As shown in Figures 3 and 4, the coil 1
When the operating current supplied to 1 is energized, the metal ball 14 is attracted by the magnetic field of the coil 11. The width of the gap 18 corresponds to the radius of the metal ball 14. When the coil 11 is not energized, the permanent magnet 17 is attached to the metal ball so that the weft thread F can be freely withdrawn axially from the storage drum 2 so that the ball is located completely inside the hole 15. Attract 14.

The magnetic force of each electromagnetic coil 11 is such that when an operating current is supplied to the coil 11, this magnetic force is applied to the permanent magnet 17.
chosen to overcome the gravitational pull of The metal ball 14 thereby moves outward in the radial direction of the hole 15 and comes into contact with the free end of the coil core 12. In this state, approximately half of the metal balls close the gap 18 for the passage of the weft thread F so that the withdrawal of the weft thread F from the storage drum 2 is terminated. When the operating current to the coil 11 is cut off, the tension in the weft thread F, which is under tension at the starting end of the weft thread insertion part, causes the permanent magnet 17 to return to its starting position and come into contact with the permanent magnet 17. cooperate with the magnetic force of Since the tension of the weft thread cooperates with the magnetic force of the permanent magnet 17 based on the shape of the metal ball 14, the holding force of the permanent magnet 17 can be made relatively low. Therefore,
Only a small portion of the attractive force generated by the electromagnetic coil 11 is required to overcome the magnetic force of the permanent magnet 17. The weft thread stopping device 10 according to the invention therefore operates faster than prior art devices using stopping elements 14 in the form of needles or pins. To further strengthen the operation of the weft thread stop device 10, metal balls 14 and permanent magnets 17 and/or
A thin plate of non-magnetic material is attached to the outer end of the permanent magnet 17 and/or to the coil core 1 to eliminate magnetic sticking or "sticking" between the coil core 12.
It can be placed at the free end of 2.

The stop element 14 may also take the form of a short cylindrical pin with a flat inner end directed towards the permanent magnet 17 and a rounded, preferably hemispherical outer end.

The control device 8 will be described in detail below with reference to FIG. The control device 8 includes computing means 20, which are standard microprocessors. The microprocessor 20 is preferably manufactured by INTEL.
It is an 8748 type microprocessor. The weft thread sensor 6 is connected to the input 21 of the weft thread sensor interface circuit 22. The weft sensor interface circuit 22 is essentially an operational amplifier 23 connected to an inverter gate 26 via a diode 24 and a resistor 25 connected in parallel with the diode 24, the output of the inverter gate 26 being connected to a microprocessor. It is connected to input pin numbers 1 and 6 of the setter 20. Inverter gate 2
The input terminal 6 is connected to ground via a capacitor 27. The gain of the operational amplifier 23 can be adjusted by a variable gain control resistor 28 connected to the operational amplifier 23. When one pulse is generated by the weft sensor 6, it is current-amplified by the operational amplifier 23. The output current of operational amplifier 23 charges capacitor 27 through diode 24 .
When the pulse signal returns to zero potential, capacitor 27 is discharged through resistors 25, 29 and 30 to ground. Since only pulses of a predetermined voltage are detected by the switching threshold of the inverter gate 26,
The weft sensor interface circuit 22 ignores small noise voltages. The capacitor is diode 2
4 and is quickly charged through resistors 25, 29
and 30, so that short pulses are converted into long output pulses generated by gate 26. Such expansion of very short input pulses is
allows reliable detection of input pulses.

The microprocessor 20 is supplied with pulse signals generated by a crystal resonator 31 connected to input pin numbers 2 and 3 of the microprocessor.

Trig input 32 receives the signal picked up at the main shaft of the loom. This signal is applied to the input of opto-electronic coupling element 33, the output of which is connected to pin number 39 of microprocessor 20. The trigger inputs are provided by a microprocessor 2 which controls the loom operation and the weft accumulation, feeding and measuring device 1.
It works to synchronize the operations of 0. More specifically, the occurrence of a trig signal indicates that the next weft thread is to be inserted.

Reset input 34 is connected to input pin number 5 of microprocessor 20 via reset input interface circuit 35. Each time the mains power of the device is applied, a reset pulse is applied to the reset input to reset the microprocessor 20 to ensure that the calculations performed by the microprocessor 20 start from the first step of the program. 34.

Input pin numbers 7 and 20 of microprocessor 20
and 25 are connected to ground.

Microprocessor pins 12-19 are connected to a +5 volt potential through a SIL resistor network 36. The SIL resistor network 36 includes eight resistors, each of which connects one of these pins to a +5 volt potential. Therefore, the microprocessor 20
Each of the input pins numbers 12-19 of , typically has a potential of +5 volts. Input pin numbers 16-19 are so-called
It can be connected to ground via a DIP switch 37. Input pin number 19 of microprocessor 20 is connected to test switch 38, and the second input terminal of test switch 38 is connected to ground. Set the DIP switch 37 appropriately,
And by closing the test switch 38,
A desired combination of bits can be applied to input pin numbers 16-19 of the microprocessor 20 to control each group of stop devices 10 by turning on and off the operating current supplied to the associated electromagnetic coil 11. Produces energization and deenergization. By doing so, it is possible to check the correct operation of the respective weft thread stop device. Such a check can be considered a test operation of the respective weft thread stop device.

A weft length setting switch 39 preferably consisting of three BCD switches 40-42 is provided,
Each BCD switch 40-42 has four input terminals and one output terminal. Each of the BCD switches can be set to a decimal number from 0-9. This decimal number is assigned to each of its four input terminals so that its corresponding one is connected to its output terminal according to the BCD code.
Converted by BCD switches 40-42. For example, if one of the BCD switches 40-42 is set to decimal 5, its first and third input terminals will be connected to its output terminal, and its second and third input terminals will be connected from the output terminal. be separated. Each of the first BCD switches 40-42
The input terminal of BCD switch 40-42 is connected to input pin number 12 of microprocessor 20 through a diode, and the second input terminal of each of BCD switches 40-42 is connected to input pin number 13 of microprocessor 20 through a diode. and BCD switch 40-
The third input terminal of each of 42 is connected to input pin number 14 of microprocessor 20 through a diode.
The fourth input terminal of each of the BCD switches 40-42 is connected to input pin number 15 of the microprocessor 20 through a diode. The output terminals of each of the BCD switches 40-42 are input pin number 36 of the microprocessor.
-38 is connected. Because SIL resistor network 36 is provided, each of input pin numbers 12-15 of microprocessor 20 is normally in their "high"state; normally, input pins 36-38 of microprocessor 20 are always in their "high" state. It is in a “high” state. switch 40
In order to read one BCD value of -42, the microprocessor 20 must read its input pin numbers 36-38.
The voltage of one of the voltages is dropped. For example, to read the BCD value of BCD switch 40, the microprocessor sets its input pin number 36 to a zero potential, or "low" logic state. If the decimal number selected by switch 40 is "5", input pin numbers 12 and 14 of microprocessor 20
is lowered to zero potential, or a “low” logic state,
Input pin numbers 13 and 15 remain in the "high" logic state.

Reference numeral 43 indicates a reset line 43 connected to reset input pin number 4 of the microprocessor 20 via a reset interface circuit 44.
shows. Each time the main power to the loom is turned on, a single pulse signal is applied to the reset line 43 to reset the microprocessor 20. In other words, this reset line ensures that the microprocessor starts executing the control program from the first step after the mains power of the loom is turned on.

Microprocessor 20 output pin numbers 27-34
are connected to input pin numbers 1-8 of the amplifier circuit 45, and this amplifier circuit 45 has eight output terminals number 11-8.
18, each of these output terminals being associated with a respective input pin. When receiving a "high" logic state input signal on its input pin numbers 1-8, amplifier circuit 45 connects the corresponding output terminal to a power supply having a potential of -35 volts. Amplification circuit 45
Each of output terminal numbers 11-18 is connected to three electromagnetic coils 11. 24 loom stop devices 10
The 24 electromagnetic coils 11 associated with are arranged in a matrix with 8 rows and 3 columns. Each output terminal of the electromagnetic coils 11 arranged in a row is connected to one of the three output lines 46-48.

Output pin numbers 22-24 are NAND gates 49-5
1 are connected to respective first input terminals of the
A second input terminal of each of NAND gates 49-51 is connected to output pin number 21 of microprocessor 20. NAND gate 49-5
1 output terminals are current amplifier circuits 52-54, respectively.
are connected to respective sets of input pin numbers 1 to 6 of the amplifier circuit 55 via the input pins 1 to 6 of the amplifier circuit 55. This amplifier circuit has 3
It includes sets of output terminals numbered 11-16, each set connected to a respective one of lines 46-48.
Upon receiving a "high" logic signal on one of the sets of input terminals, amplifier circuit 55 sets the corresponding set of output terminals to +5.
Connect to a voltage source. According to the circuit configuration described above, the microprocessor 20 has output pin number 27.
−24 by generating a high power signal on one of the 34
determining the column of coils 11 to be activated by energizing one of the electromagnetic coils 11, and further generating an energizing signal on its output pin number 21 and output pin number 22-24; Select the column of electromagnetic coils 11 to be activated by generating a "high" output signal on one of the electromagnetic coils 11. The above matrix arrangement is made up of 11 output pin numbers 22-24, 27-34.
One electromagnetic coil 1 out of 24 electromagnetic coils 11
1 is allowed to operate. Microprocessor 20 generates a strobe signal on its output pin number 21 to periodically turn on and off the operating current flowing through a selected one of electromagnetic coils 11. By strobing the actuation current it is possible to reduce the average power consumption, while the strong magnetic actuation force generated by the selected electromagnetic coil 11 can be maintained by the high peak value of the actuation current. The strong magnetic force generated by the selected electromagnetic coil 11 is only necessary to move the stop element 14 into the actuated position. Such a strong magnetic force is generated during the first peak of successive peaks of the operating current supplied to said coil 11. The average magnetic holding force corresponding to the average level of successive peaks of the actuation current is
can be chosen substantially lower to maintain it in the "weft stop" position. By adaptively choosing the time relationship between the "on" and "off" time periods of the working current, the time dependence of the magnetic force generated by the working current flowing through the selected electromagnetic coil 11 is accommodated. It is possible to adapt the actuation force of the weft thread stop device 10 to the required time dependence.

Output pin number 34 of the microprocessor 20 is connected to a light emission blocker 57 via a current amplifier 56;
The light emission blocker 57 is connected to ground via a resistor 58. The light emission block 57 actuates a light sensitive switching element 59 to actuate a loom stop relay (not shown).

Output pin number 35 of the microprocessor 20 is connected to a light emitting element 61 via a current amplifier 60.
The light emitting element 61 is connected to ground via a resistor 62. The light emitting element 61 actuates a light sensitive switching element 63 which is connected to a relay (not shown) which controls the operation of the valve of the main jet nozzle of the loom.

The amplifier circuit 45 is a "UDN2580A" type standard circuit element. The amplifier circuit 55 is also a "UCN20002A" type standard circuit element. Two amplifier circuits are available from the company "SPRAGUE".

Referring to FIG. 6, the microprocessor 20
A flow diagram of a control program stored in a read-only storage device is shown. Upon receiving the reset signal, the microprocessor 20 outputs “START”.
The program is reset to start execution from the first instruction.

In program step number 1, the microprocessor 20 activates the predetermined weft thread stop device 10 to fix the weft thread F in its starting position. Preferably, said stop device 10 is chosen such that its angular position is offset by 180° with respect to the angular position of the weft thread sensor 6. The microprocessor 20 stores the number or angular position of the stop device in its RAM predetermined storage cells.

In program step number 2, the microprocessor 20 successively reads the BCD code of the switch representing the desired weft thread length and selects the corresponding BCD code.
The code is stored in a predetermined storage cell of that RAM.

In the program switch 3, the microprocessor 20 converts the BCD code representing the desired weft thread length into a digital value corresponding to the number of revolutions and 1/24 revolution. Here, this digital value represents the rotation of the weft thread withdrawal point during the withdrawal of the desired weft thread length. It is also possible to express the desired weft thread length by a value corresponding to the time required to draw out this weft thread length.

Program step number 4 is a wait routine that causes microprocessor 20 to wait to receive a trigger signal from the loom before going to program step number 5. This wait routine is implemented by a program loop that periodically checks whether a trigger signal is generated. When the above conditions are met, the microprocessor continues with program step 5.

In program step 5, the microprocessor generates a "high" signal on its output pin number 35 to activate the relay that controls the valve of the loom's main jet nozzle.

In program step number 6, the stop device 10 activated during program step number 1 is deactivated to release the weft thread.
At program step number 7, microprocessor 20 tests whether the weft thread passes through the weft thread sensor by repeatedly testing the logic state of input pin numbers 1 and 6. When this condition is met, microprocessor 20 continues with program step number eight.

In program step number 8, the microprocessor 20 begins measuring the passage of time since the occurrence of the pulse signal indicating the passage of the weft thread through the detection area of the weft thread sensor 6.

At program step number 9, microprocessor 20 executes program step number 7.
The wait loop corresponding to the wait loop of is executed again. As soon as the weft thread passes the weft thread sensor 6, the microprocessor 20 starts program step number 10.
Continue from.

At program step number 10, microprocessor 20 stores the time between two consecutive pulse signals received from weft thread sensor 6. Microprocessor 20 resumes measurement for the next time.

At program step number 11, microprocessor 20 calculates at which weft thread position the main jet nozzle should be switched off.

At program step number 12, microprocessor 20 executes program step number 3.
during which it is calculated at which weft thread position the selected stopping device 10 should be activated.

At program step number 13, microprocessor 20 enters program step number 10.
The instantaneous position of the weft thread is calculated based on the actual weft thread withdrawal speed measured during.

At program step number 14, microprocessor 20 enters program step number 13.
Check whether the instantaneous position of the weft thread determined during is equal to the weft thread position determined during program step number 11. When this condition is met, microprocessor 20 continues with program step number 15. If not, continue with program step number 16.

At program step number 15, microprocessor 20 turns off the main jet nozzle by dropping its output pin number 35 to zero potential.

At program step number 16, microprocessor 20 enters program step number 13.
Check whether the calculated instantaneous position of the weft thread determined during corresponds to the weft thread position calculated during program step number 12. If so, microprocessor 20 goes to program step number 23. Otherwise, execution continues with program step number 17.

At program step number 17, the microprocessor 20 enters program step number 13.
Check whether the calculated position determined during is close to the position of the weft thread sensor 6. By doing so, a time window is realized. If this condition is not met, microprocessor 20 returns to program step number 13. When satisfied, continue with program step number 18.

At program step number 18, the microprocessor 20 again checks whether the weft thread has passed the weft thread sensor 6. This program step corresponds to program step number 7. When this condition is met, microprocessor 20 continues with program step number 19. Otherwise, continue with program step number 20.

At program step number 19, microprocessor 20 stores the measured time between two consecutive pulses received from weft thread sensor 6 and returns to program step number 13.

Program step number 20 includes a safety routine that checks if a weft thread breakage has occurred. This safety routine is realized by comparing the calculated time with a time threshold that is only exceeded in the event of a weft thread breakage. In other words, the microprocessor 20 checks whether the measured elapsed time since the last passage of the weft thread through the detection area of the weft thread sensor 6 exceeds a time threshold. If this condition is not met, microprocessor 20 continues with program step number 18;
Otherwise, go to program step number 21.

In program step number 21, the loom is stopped because a weft thread breakage has occurred. To this end, microprocessor 20 generates a "high" logic potential signal on its output pin number 34.

At program step number 22, microprocessor 20 returns to the program start command upon receiving a reset signal.

In program step number 23, the microprocessor 20 activates the stop device 10 to stop the withdrawal of the weft thread. Additionally, the microprocessor 20 stores the number of the actuated stop device.
It is stored in a predetermined storage cell of RAM.

At program step number 24, microprocessor 20 executes program step number 4.
Check whether the trig signal received at has disappeared by then. As soon as the trigger signal disappears, the microprocessor goes to program step number 25.

At program step number 25, microprocessor 20 executes program step number 2.
Execute the corresponding program step.

At program step number 26, microprocessor 20 executes program step number 3.
Execute the corresponding program step.

At program step number 27, there is a wait routine that repeatedly tests whether a trig signal is applied to trig input 32. Such a trigger signal indicates that the loom is ready for further weft insertion. As soon as the trigger signal is generated, microprocessor 20 goes to program step number 28.

At program step number 28, microprocessor 20 turns on the loom's main jet nozzle by generating a "high" logic potential signal at output pin number 35.

At program step number 29, microprocessor 20 enters program step number 23.
deactivates the stop device that was activated when executing the The microprocessor 20 then programs the
Return to step number 11.

Appendix A enclosed herein is a program of machine code or object code stored in the read-only memory of microprocessor 20. Based on this detailed program, the microprocessor 20 is enabled to carry out the control of the feeding device as described with reference to FIG.

[Brief explanation of the drawing]

1 shows a partially sectional side view of the device according to the invention, FIG. 2 shows a front view of the device shown in FIG. 1, and FIGS. 5 shows a detailed diagram of the apparatus shown in FIG.
4 is a circuit diagram of a control device of the device shown in FIG.
The figure shows a flowchart used in the microprocessor of the control device shown in FIG.

Claims (1)

[Scope of Claims] 1. A stationary accumulation drum 2 on which the weft yarn accumulation is wound by a winding device 3 and from which the weft yarn F is drawn out while rotating around its drawing end, while being drawn out from the accumulation drum 2; The weft thread detecting means 6 is arranged such that the weft thread passes through the detection area of the weft thread detecting means 6, and the weft thread detecting means 6 generates pulse signals, and each pulse signal detects when the weft thread F passes through the detection area of the weft thread detecting means 6. a plurality of weft thread stops shown and arranged at angular intervals around the storage drum 2 and comprising a weft thread stop element 14 and actuator means 11 for moving said stop element 14 in and out of the path of the drawn weft thread; The device 10 further comprises an actuator control device 8 adjustable to the desired weft thread length to be drawn out, said control device 8 having an angular position corresponding to the instantaneous angular position through which the weft thread passes when said desired weft thread length is drawn out. Selected weft thread stop device 1
Apparatus 1 for accumulating, feeding and measuring weft threads, in particular for jet looms, responsive to said pulse signals such that an activation signal is sent to the machine, said weft thread detection means 6 being less than the number of weft thread stopping devices 10. The control device 8 furthermore comprises a storage device 20 for storing information regarding the weft thread stop device 10 activated at the end of the previous weft thread withdrawal cycle, and calculation means 20, the control device 8 comprising a Based on the input information to this calculation means 20 representing the weft thread length of the weft thread to be activated next from the plurality of weft thread stopping devices 10 in order to obtain the desired weft thread length and on the basis of said stored information. Device for accumulating, feeding and measuring weft threads, characterized in that it comprises calculation means 20 for determining the stopping device 10. 2. The device according to claim 1, characterized in that the weft thread detection means 6 comprises a single weft thread sensor 6. 3. According to claim 2, the stored information regarding the weft thread stop device 10 activated at the end of the previous withdrawal cycle indicates the relative angular position of the weft thread stop device 10 with respect to the weft thread sensor 6. equipment. 4. The calculation means 20 determine the operating position of the withdrawal point of the weft thread F withdrawn from the storage drum 2 on the basis of the desired weft thread length, in which the determined weft thread stop device 10 is activated, and the calculation means 20
measures the time between the occurrence of two successive pulse signals generated by the weft thread sensor 6, and on the basis of said measured time, the calculating means 20 calculates the storage drum for the respective position of each weft thread stop device 10. calculating the instantaneous position of the withdrawal point of the weft thread F to be withdrawn from the machine; furthermore, the calculation means 20 actuate the determined weft thread stopping device 10 as soon as the calculated instantaneous position is equal to said determined operating position. A device according to one of claims 1 to 3 characterized in that: 5. Device according to claim 4, characterized in that the calculation means 20 carry out the following steps to determine the instantaneous position of the withdrawal point of the weft thread F. (b) setting the calculated instantaneous position to a value corresponding to the position of the previously actuated weft thread stop device; (b) incrementing the calculated instantaneous position by a predetermined percentage;
Check whether the calculated instantaneous position is equal to the position of the weft thread sensor 6 or whether the calculated instantaneous position is equal to the actuating position; (c) if the calculated instantaneous position is equal to the position of the weft thread sensor; , hold at the calculated instantaneous position and check whether the weft sensor generates a pulse signal; as soon as the weft sensor generates the pulse signal, return to step (d); the generation of the pulse signal is calculated; (d) if the instantaneous position is equal to the actuating position, actuating the determined weft thread stop device; 6 The operating position of the withdrawal point of the weft thread F which is withdrawn from the storage drum 2 is determined by the time elapsed during the movement of the withdrawal point of the weft thread F from said operating position to the determined position of the stop element 14 of the weft thread stop device 10. determined to be greater than the response time of the weft thread stop device, said response time being defined by the time delay between the supply of actuation current to the actuator means 11 of the weft thread stop device 10 and the completion of the movement of the stop element 14. The device according to claim 4 or 5, characterized in that: 7 Based on the desired weft thread length, the calculation means 20 calculates the time between the release of the weft thread stop device 10 activated at the end of the previous withdrawal cycle and the activation of the determined weft thread stop device 10 to be activated next. determining the predetermined activation time, the calculating means 20 calculates the time that has elapsed since the release or deactivation of said weft thread stop device activated at the end of the previous withdrawal cycle, the calculating means 20 calculating the time that has elapsed since the release or deactivation of said weft thread stop device that was activated at the end of the previous withdrawal cycle; As soon as the calculated time corresponds to the determined operating time, the calculating means 20 corrects the calculation of said time on the basis of the respective time between two successive pulse signals, Device according to one of claims 1 to 3, characterized in that it generates an actuation signal for actuating the actuator means (11) of the stopping device (10). 8. characterized in that the calculated elapsed time since the release or deactivation of said weft yarn stop device 10 activated at the end of the previous withdrawal cycle represents the angular position of the withdrawal point of the weft yarn F withdrawn from the storage drum 2; 8. The apparatus according to claim 7. 9. Calculating means 20 carry out the following steps in order to calculate the time elapsed since the release or deactivation of the weft thread stop device 10 activated at the end of the previous withdrawal cycle:
Apparatus according to paragraph or paragraph 8. (b) When releasing or inactivating the weft thread stopping device 10, the value representing the calculated time is reset to zero; (b) the value is increased by a predetermined percentage; (b1) the value is or (b) a preset time selected such that said value is several percent, preferably 10%, smaller than the time that elapses during the withdrawal of one turn of the weft yarn from the storage drum 2. (c) If the condition (b) 1 is satisfied, generate an activation signal; (d) If condition (B2) is satisfied, the value equal to the preset time or an integer multiple thereof is held; (E) Next, check whether the weft thread sensor 6 generates the next pulse signal; ) As soon as condition (e) is met, return to (b). 10 having a jet nozzle for inserting the weft yarn by means of compressed air during the weaving process, the jet of compressed air generated by the jet nozzle being controlled by a drive current for controlling the supply of compressed air to said nozzle; Apparatus according to one of the claims 4 to 9 for a jet loom which can be controlled by actuatable solenoid valves, in which the calculation means 20 determine the actuation of the respective weft thread stop device 10. Apparatus, characterized in that it is electrically connected to said valve for controlling the opening and closing of said valve in a time-dependent manner. 11 The calculation means 20 open said valve for a predetermined time before deactivating the weft thread stop device 10 that was activated at the end of the previous weft thread withdrawal cycle, and then open the determined weft thread stop device 10 to be activated. 11. The device of claim 10, modified to close the valve for a predetermined period of time before actuation. 12 said predetermined time corresponds to a response time of said valve and said jet nozzle, said response time being a time delay between the supply of drive current to said solenoid valve and the point at which the jet of compressed air is fully established; Claim 11 characterized in that
Equipment described in Section. 13. Claims 1 to 12, characterized in that the calculation means 20 is a microprocessor 20.
Apparatus described in one of the sections. 14 a weft yarn accumulation drum for winding the weft yarn, each operable between a yarn release position and a yarn actuation position and each independently actuatable and releasable arranged at predetermined angular intervals around said weft yarn accumulation drum; in particular a jet loom, comprising a weft thread stopping device having a plurality of weft thread stopping elements, and weft thread detection means generating a pulse signal each time a weft thread passes through a detection area while the weft thread is being withdrawn from said weft thread accumulation drum. For, accumulating weft,
A method for controlling a feeding and measuring device, comprising the steps of: calculating the operating position of a weft thread withdrawal point on the basis of information about the angular position of the actuated weft thread stop element at the end of the previous weft thread withdrawal cycle; , selecting one of said weft yarn stopping elements that needs to be actuated next based on the desired weft yarn length; detecting a subsequent pulse signal from said weft yarn detection means; calculating the instantaneous position of the withdrawal point of the weft thread using said detected pulse signal from the detection means, and then actuated as soon as said calculated instantaneous position is equal to said calculated actuation position. Activating a weft thread stop element. 15. The calculation of the instantaneous position of the thread withdrawal point comprises: a) setting the calculated instantaneous position to a value corresponding to the position of the actuated weft thread stop member at the end of the immediately preceding weft thread withdrawal cycle; and b the calculated instantaneous position at a predetermined speed. increasing the position and checking whether the calculated instantaneous position is equal to the position of the weft thread detection means or whether the calculated instantaneous position is equal to the actuation position; c. holding said calculated instantaneous position if equal to the position of the means and checking whether the weft thread detection means generates a pulse signal, returning to said step b as soon as the weft thread detection means generates said pulse signal; generating the pulse signal such that the calculated instantaneous position is equal to the actual instantaneous position of the weft thread withdrawal point, and d if the calculated instantaneous position is equal to the actuation time; 15. A method according to claim 14, characterized in that it comprises the step of actuating a weft thread stop member to be actuated next. 16. Method according to claim 14, characterized in that the pulse signal from the weft thread detection means is used to correct the calculated instantaneous position or the measured time interval. 17. According to any one of claims 14 to 16, characterized in that the time intervals between successive pulse signals from the weft thread detection means are used for the calculation of the instantaneous position or for the measured time intervals. The method described. 18 The jet loom has a jet nozzle for inserting the weft thread drawn from the weft storage drum, and the calculation of the weft thread draw-off point is performed to control the actuation of a valve associated with the jet nozzle. 18. A method according to any one of claims 14 to 17, characterized in that it comprises the step of using the measured instantaneous position or the measured time interval. 19. Said step for controlling said valve comprises opening said valve at a predetermined time interval before releasing the weft thread stop element and closing said valve at a predetermined time interval before actuating the weft thread stop element. The method according to item 18. 20 said predetermined time interval corresponds to a response time of said valve and said nozzle, which response time is the delay time between supplying drive current to said valve and the point at which a jet of compressed air is fully formed; 20. The method according to claim 19, characterized in that: