CS197234B2 - Yarn metering and winding apparatus for textile machines having a plurality of work units - Google Patents

Abstract

1480398 Metering yarn in textile machines NUOVA SAN GIORGIO SpA 9 July 1974 [10 July 1973 19 Oct 1973] 30458/74 Heading D1F In a method of metering a predetermined length of yarn in a textile machine having work units, e.g. an open end spinning machine reference pulses are generated proportional to the rotational speed of a yarn feeding member counting pulses are generated each for a given adjustable number of reference pulses, the counting pulses are supplied to each of the work units, the counting pulses are counted independently at each work unit, and when a given number of pulses has been counted at a work unit a control signal is generated to terminate the supply of material or yarn to the unit. In an open-end spinning machine, Fig. 2, yarn is drawn from rotors 11 at each station 10 by rollers 16 on shaft 20, generator 25 connected to shaft 20, feeds pulses to adjustable frequency divider 26 producing count pulses fed to a count unit 27 at each station 10. Each unit comprises a counter 27, device 27' for terminating the supply of count pulses, a signalling device, e.g. lamp 34, to indicate the termination, and manual counter reset 27". Each unit 28 counts a predetermined number of count pulses and then actuates an electromagnetic clutch 30 to stop sliver feed by device 13. If sensor 31' senses yarn absence it actuates termination device 27' and the signalling device and stops the feed device. Alternatively, in a multi-station winder, Fig. 3, shaft 35 supporting traverse rollers 36 actuates pulse generator 25 feeding pulses to frequency divider 26 feeding count pulses to a count unit 28 at each station. Unit 28 actuates yarn cutter 41 and signaller 34 when the required yarn length has been counted. An electronic slub catcher may replace yarn sensor 31', and may also operate cutter 41. Generators 25 may be photo-electric, magnetic, mechanical or pneumatic transducers.

Description

The invention relates to a device for measuring and winding a yarn length in a textile machine having several workstations, synchronously with the speed of the control shaft mechanically connected to a rotating member of each workstation whose peripheral speed corresponds to the linear speed of the yarn itself.

The invention is intended for conventional textile yarn manufacturing and processing machines, and is particularly useful when used in open-end spinning machines.

As is known, the yarns often coalesce or twist. This procedure is carried out on the textile machines themselves and necessarily requires the reels to be wound on which the same yarn length is wound to avoid wastage while reducing labor. In other processing methods, it is also advantageous to use spools on which the same yarn length is wound on all of them.

Thus, after the yarn has been spun, it is necessary to ensure separately that bobbins are formed which contain substantially the same amount of yarn. Usually this operation is carried out on winding machines provided with suitable measuring devices for measuring the wound length of the yarn. The prior art measuring devices are based, for example, on measuring the weight or diameter of the coil and are more or less inaccurate. Measuring the length of the yarn in function of the bobbin weight involves problems associated with accurate weighing, and these problems are greater the finer the yarns are processed. When the yarn length is measured indirectly by yarn diameter, there are considerable differences in yarn length between the bobbins having the yarn wound more or less tightly.

For measuring the yarn length on textile machines of the above-mentioned type, machines or apparatus are still used in which the counting pulses are generated centrally, which are fed to the counting units or computers, preset, for several workstations of the machine.

Although the prior art devices give good results, they still have the disadvantage that the preset counting units, one of which must be adapted at each workstation, are very expensive.

A further disadvantage is the fact that when changing the yarn measurement being processed and wound on the reels, the adjustable speed on each of the counting units must also change. This disadvantage is particularly pronounced considering that textile machines are usually provided with many dozens of jobs or heads, and hence the time required to pre-set all machine counting units is long and entails further cost increases.

It is therefore an object of the present invention to provide a simplified yarn length measuring device which allows the use of less expensive components and furthermore allows the yarn measurement rate or yarn measurement rate to be changed simultaneously at all workstations by pre-setting it to a single measurement. a central unit that is common to all workstations.

The device according to the invention is suitable for incorporation into textile machines for the production or processing of yarn and is of the kind in which a single control shaft is provided for several workstations of the machine, the speed of this shaft being in relation to the amount of yarn to be measured; According to the invention, a pulse generator is connected to the control shaft, the output of which is connected to an input of a preset frequency divider, the output of which is connected to a peripheral! counting units with fixed counting capacity, located. at each of the machine workstations, with the output of each counting. the unit is operatively connected to the yarn breaker.

According to a preferred embodiment of the invention, the output of the frequency divider is connected to the counting stop device and that an active connection is provided between the yarn sensor and the associated counting stop device.

When using the invention for an open-end spinning machine, the peripheral counting unit is operatively connected to the fiber stopping device or the yarn cutting device.

According to another embodiment, the peripheral counting unit comprises, for each workstation, a device for indicating the end of the counting.

According to another embodiment, each of the peripheral counting units comprises a manually operated clear or reset control device.

The output of each peripheral counting unit is expediently connected to the control terminal of the switching device connected to the control circuit of the yarn breaker and the yarn breaker signaling device. According to a further embodiment, the control circuit of the yarn interruption device and the signaling device circuit for signaling a random or technological yarn breakage are connectable by a contact controlled by the yarn sensor.

According to a preferred embodiment of the invention, each peripheral counting unit comprises an amplifier for counting pulses emanating from a frequency divider, wherein the splitter circuitry defines a predetermined counting range and the splitter circuit output is connected by a bistable circuit to a switch control electrode connected to the yarn interrupter circuit. and further between said circuit. and a connection for performing the control is included in the amplifier.

The invention will now be described in more detail with reference to the drawings, showing exemplary embodiments of the invention.

Giant. 1 shows a block diagram of the apparatus.

Giant. 2 schematically shows an apparatus according to the invention when used on an open-end non-ring spinning machine.

Giant. 3 shows an apparatus according to the invention when used on a winding machine.

Giant. 4 is a similar block diagram of one embodiment of the electronic apparatus of FIG. invention.

Referring to Fig. 1, it is clear that an apparatus for measuring the length of yarn at one or more workstations of textile machines, for example spinning machines or other machines, for converting one type of yarn package or yarn body to another type of different weight, shape or size For example, for winding yarn from a spool to a spool, it essentially comprises a single pulse changer or generator 1 driven by a shaft 2 common to all workstations of the textile machine, the speed or speed of this shaft being proportional to the yarn being processed or manufactured. in the given relationship. This converter 1 cyclically generates reference pulses 11 according to the speed or reversal of the shaft 2 and these reference pulses are fed as input pulses to the central processing unit 3, which converts these reference pulses. for counting pulses 12 in accordance with a preset ratio K using a single frequency ratio setting device 4, which is assigned to the central processing unit 3 and comprises, for example, a digital switch or the like. The input pulses l1 fed to the central unit 3 are conveniently converted to counting pulses 12 with a frequency ratio vi / va = K, where vi is the frequency of the reference pulses i1 and i> 2 is the frequency of the counting pulses i2. In other words, the central unit 3 issues a counting pulse I2 when it receives such a number of reference pulses 11 that is related to the ratio K set on the switch 4.

The counting pulses 12 are fed to individual counting units 5 provided for each workstation of the textile machine. These counting units 5 consist essentially of computers with a fixed counting range which, upon reaching a predetermined number Q of counting pulses 12, emit a control signal which triggers the respective yarn breaking device 6. These counting. the units 5 may be of any type, for example electronic, electrical, mechanical or pneumatic, and may be reset or reset to zero by actuating a reset device, for example a button 7 schematically shown in FIG. 1.

From the foregoing, it can be seen that the ratio K preset in the frequency setting switch 4 is again determined by the measured yarn length L and the number n of reference pulses 1 per yarn length unit relative to the fixed counting range Q common to all counting units 5: K ---.

When for. simplicity is chosen η - 1, the ratio K of the pulse conversion will be determined by the ratio of the variable measured yarn length L and the counting range Q of the counting units 5, wherein Q is constant.

The above process will be explained by way of example. Suppose that 360,000 yards of yarn are measured at each workstation by counting units with a counting range of 1000 pulses, at one pulse 11 at the central processing input. units 3 for each yarn meter. Under these conditions, it is only necessary to set the switch 4 to a ratio of 365, that is, for each 365 input pulses 11, the central unit 3 delivers one counting pulse I2. It can be seen that by simply affecting the frequency ratio setting switch 4, it is possible in a single operation to readily change the measuring range of the length of the yarn produced or processed at each of the workstations of the textile machine.

Referring to FIG. 2, the apparatus of the invention will be described when used on an open end open-end spinning machine for direct measurement of spool winding yarn in a spinning machine.

As is known, an open-end spinning machine typically comprises a large number of spinning units 10, each of which represents a machine work station. Each of the spinning units 10 comprises a rotor or a rotating hollow member 11 forming part of the spinning chamber, to whose interior are supplied loose fibers withdrawn from the web or strand 12 in a known manner by the action of the feed device 13.

The rotor 11 of the spinning units is rotated by, for example, an endless belt 14 driven, for example, by an electric motor 15, the yarn 24 formed in each of the spinning units 19 being withdrawn, for example, by respective pulling rollers 16 supported by a single drive shaft 20 common to all workstations. roller 17 in a manner known per se. The yarn withdrawn from the spinning unit by the take-up rollers 16 is wound onto the bobbins 18, for example by means of a guide roll 19 or the like. The draw-off rollers 16 are supported by a common shaft 20 which extends across the textile machine and likewise the winding or guide rolls 19 are supported by a common drive shaft 21. The shafts 20 and 21 are mechanically interconnected by a drive 22, one of the two shafts being rotatable. for example by an electric motor 23.

Obviously, the yarn 24 withdrawn at a constant speed from each spinning unit 10 is in contact with the outer surface of the take-off rollers 16, so that the amount of yarn wound on each of the bobbins 18 can be very precisely related to the speed of the rolls 16 or 19 to the number of revolutions of the common drive shaft 20 or 21.

According to the above embodiment of the invention, the yarn measuring apparatus consists essentially of a reference pulse generator 25, for example a photoelectric, magnetic, mechanical or pneumatic transducer or the like, depending on the nature of the signal produced, which generator 25 converts rotation of the shaft 20 or 21 to a sequence of reference pulses whose frequency is proportional to the speed of rotation of the drive shaft 20 or 21.

The generator 25 generates a predetermined number of n pulses per length unit of yarn depending on the ratio of this length unit to the length of the circumference of the rollers 16 or 19.

The reference pulse generator 25 is connected to an input of a predetermined frequency divider 26 which is common to all workstations and at its output generates a counting pulse train whose period is proportional to the yarn length measured according to the above, the frequency divider 26 being preset by rotatable switches, which in the illustrated case are incorporated into the frequency divider 26.

The output of the frequency divider 26 is fed to the peripheral counting units 28 for each of the spinning units 10 or workstations of the textile machine.

In addition to its own computer 27, each of them includes a. peripheral counting units 28 of the counting pulse stop device 27 ', a counting stop signaling device, for example a light bulb 34, and a hand control device 27' for clearing or resetting the computer 27.

Each of the counting units 28 is adapted to count a predetermined number of counting pulses, which number, as mentioned above, is constant and independent of the measured yarn length as set at the frequency divider 26. At the end of each counting period, each counting unit A control signal will be output at the output of the yarn interrupter. In the particular case of the open-end spinning machine shown in Fig. 2, the interruption of the yarn production can be achieved by interrupting the supply of fibers to the spinning unit 10.

In the example shown, each of the counting units 28 controls the supply circuit for, for example, the coil 29 of the electromagnetic clutch 30 wedged on the drive shaft of the sliver supply device 13

12, thereby stopping fiber supply and yarn production. A sensor 31 'for detecting the absence of yarn is also provided for each of the workstations and is operatively connected, as indicated by the guide 31, to the break-off device 27' at the respective workstation. As indicated by the connection 32, each open-end spinning machine of the open-end spinning machine is usually provided with a sensor 31 'operatively connected to the fiber feeding device 13 to stop the device whenever the yarn 24 is broken. 31 'already provided on the spinning unit can also be used to control the counting interruption device 27.

A signaling device 33, for example a bulb or other 'optical signaling device, controlled by the sensor 31', informs the worker of the yarn breakage.

As mentioned above, the second signaling device 34, such as a bulb or the like, is triggered by an output signal from the counting unit 28 associated with each spinning unit.

Referring now to FIG. 3, another example of use of the apparatus of the invention will be described. Giant. 3 illustrates, by way of example, a single workstation of a winding machine essentially consisting of a drive shaft 35, suitably rotated and supported by a roller 36, of which only one is shown, which serves to distribute and wind the yarn 37 from the spool 38 to the spool 39 mounted on axis 40.

Again, the shaft 35 is coupled to a reference pulse generator 25 (the same reference numerals are used for the components common to the example of FIG. 1), which supplies signals to the frequency divider 26.

As above, the output of this frequency divider 26 is simultaneously fed to all counting units 28 assigned to different workplaces. The yarn sensor 31 is similarly connected by an operative connection 31 to the counting device 27 at each counting point.

The first signaling device 33 informs the worker of the yarn break caused by accidental or technological causes, and the second signaling device 34 informs that the desired amount of yarn has been wound on the spool and that the counting has been stopped and the yarn production has been stopped. In contrast to the previous example, in the case of FIG. 3, the outlet of each local unit 28 is fed to the yarn cutting device 41. If the winding machine was equipped with an electronic yarn cleaner, this yarn cleaner can also assume the role of the above-mentioned sensor 3Γ; in this case, the cutting device 41 is connected to the second operative connection 42 to the electronic yarn cleaner 31 in order to remove those yarn sections which do not have the desired technological properties.

The operation of the apparatus according to the invention is substantially similar to that described with reference to FIG. 1. In the open-end spinning machine of FIG. 2, yarn 24 is continuously formed on each of the spinning units 10 supplied with loose fibers from the fiber strand 12. and is pulled off by rollers 16 and 17, and then wound on the bobbin 18 by the action of roller 19. As can be seen from the above, at each revolution or revolution of the take-off roller 16, i.e. at each revolution of the drive shaft 20, This pulse 26, on which the measured yarn length has been set, processes the input reference pulses by transmitting counting pulses at a rate proportional to the set yarn length. These counting pulses coming from the frequency divider are fed to individual counting units 28 which send a control signal whenever a predetermined number of pulses is counted. This control or control signal thus formed is used to start the device which causes the fiber supply to stop, in this case the electromagnetic clutch 30. At the same time, the counting on the counting unit 28 assigned to the spinning unit is stopped. Otherwise, in the case of FIG. 3, the output signal of the unit 28 'causes the operation of the cutting device 41 which breaks the yarn.

In the event of a random or technological yarn break, the sensor 31 'generates a control signal through the active connection 31 to the device 27' 'which stops the counting unit 28. As soon as the yarn break is repaired, the counting starts again. is measured further. At the same time, the other workstations of the machine continue their work without being disturbed or adversely affected by stopping and starting the workstation where the yarn breakage occurred.

When the desired amount of yarn is wound on the bobbin, signaling devices 33 and 34 'on the spinning unit are actuated, thereby signaling to the worker that the yarn is interrupted and the measurement is completed. The worker must then replace the filled spool with an empty spool. By actuating the hand controller 27 ”, the local counting unit 28 is cleared and a new measuring cycle can be initiated.

Fig. 4 shows an electrical embodiment of the apparatus according to the invention.

The reference pulse generator 25 shown in FIG. 4 consists essentially of a gear 45 which is mechanically coupled to one of the machine drive shafts 20 or 35, and an electromagnetic sensor 46 whose output signals are applied to an amplifier 47 which is amplifies and supplies them in turn via a separator 48 to a monostable circuit 49 which imparts the desired shape to each pulse thus generated and

7 '· 2- 3 4 amplitude. The output of the circuit 49 is connected to the frequency divider 26 at which the length of the yarn to be measured is set by the first and second dividing circuits 50 and 51.

In the example shown, this frequency divider 26 is formed by counting circuits 52, 53, 54 and 55 which correspond to units, tens, hundreds and thousands for a preselected base unit, comparators 56, 57, 58 and 59 and assigned by rotary switches or adjusters 60 , 61, 62 and 63.

Each of the counting circuits and the associated rotary switches on which the number of units preselected for each size order is manually set is connected to an associated comparator.

The various comparators 56, 57, 58 and 59 are cascaded and the output of the last comparator 59 is connected to the reset circuit 64 for the counting circuits 52-55 and to the monostable circuit 65.

The output of the monostable circuit 65 is sent to the peripheral counting units 28 assigned to the workstations, e.g., the spinning units 10 shown in FIG. 2.

In the example shown in Fig. 4, each counting unit 28 comprises an amplifier 66, which in this case also serves to perform a similar function to the interruption device 27 'of the counting signal, wherein the amplifier 66 is connected by a first dividing circuit, eg bistable circuit 67 2 and 3. The latter circuit 69 is connected to another bistable circuit 70 which supplies the base of the transistor 71 or to the other circuitry 68, 69 and 69, respectively. the control terminal of the respective switch.

Transistor 71 is coupled to line 72 with line 72

Claims (9)

Subject A device for measuring and winding a yarn length in a textile machine having a plurality of workstations, synchronously with a speed of a control shaft mechanically coupled to a rotating member of each workstation whose peripheral speed corresponds to a linear speed of the yarn itself. 2, 20) is connected to a pulse generator (1, 25), the output of which is connected to an input of a preset frequency divider (26), the output of which is connected to peripheral counting units (28) of fixed counting capacity located at each of the work stations machine, the output of each counting unit being operatively connected to the yarn breaker. Device according to claim 1, characterized in that the output of the frequency divider (26) is further coupled to a device (27 '') for stopping the counting signal and being a control circuit for the device. . interrupting the yarn in a textile machine, such as an electromagnetic clutch 30, while the second control circuit may be connected by contact 74 of the aforementioned yarn sensor. The second shunt branch 75 serves to trigger a signaling device, for example a bulb 34 via a transistor 71, wherein the signaling device or the bulb lights up after completion of the counting and indicates that a predetermined yarn length measurement has been completed at a given workstation. The second signaling device, e.g., the bulb 33, is switched on by connecting the contact 74 of the aforementioned yarn sensor, thereby indicating a random yarn break when the counting has not yet been completed. Between the amplifier 66 of the counting unit 28 and the line 72 connecting both the supply circuit for the electromagnetic clutch 30 through the transistor 71 and the signal lamp circuit 34 through the yarn sensor contact 74, a connection 78 corresponding to the substantially active connection 31 of FIG. 1 and 2 between the yarn sensor 31 'and between the yarn device 27'. stop counting. The manually operable pushbutton 79, which performs the same function as the control device 27 ”of FIG. 1 or 2, allows to clear the counting unit 28 for performing the next counting event. The above embodiment shown in FIG. 4 is merely exemplary, since other embodiments performing the same function may be used in the present invention and in the drawings. For example, the counting units 28 assigned to the different workstations as well as the central counting unit 26 may be replaced by equivalent devices of mechanical or pneumatic or mixed nature, depending on the nature of the signals produced. I invoke a dowry connection between the yarn sensor (31 ´) and the associated device (27 ´) for stopping the counting signal. 3. Apparatus according to items 1 and 2, in particular for an open-end spinning machine. characterized in that the peripheral counting unit (28) is operatively connected to the yarn stopping device (30). Device according to claim 3, for textile machines, characterized in that the peripheral counting unit (28) is operatively connected to the yarn cutting device (41). Device according to one of Claims 1 to 4, characterized in that the peripheral counting unit (28) for each work station (10) comprises a device (34) for indicating the end of the counting. Device according to Claims 1 to 5, characterized in that each of the peripheral counting units (28) comprises a manually operated clearing or resetting control device (27 "). Device according to claim 1 or 2, characterized in that the output of each peripheral counting unit (28) is - connected to the control terminal of the switching device connected to the control circuit of the yarn break device (41) and the signaling device (33). accidental or technological yarn break. Device according to claim 6, characterized in that the control circuit (41) of the yarn breaker (41) and the circumference of the signaling device (33) for signaling accidental - or technological yarn breakage are connectable by a contact controlled by the sensor - (3Γ). -yarn. Apparatus according to one of Claims 1 to 7, characterized in that each peripheral counting unit (28) comprises an amplifier (66) for counting pulses emanating from the frequency divider (26), the array of dividing circuits (67, 68, 69) defining - a predetermined counting range and output of the splitting circuits (67, 68, 69) is connected by a bistable circuit (70) to a control electrode of the switch (71) which is connected to the circuit for the yarn interrupting device (30); and an amplifier (66) for engaging the control. 3 sheets of drawings Severography, n., Plant '7, Most