EP0081502B1 - Woof preparation device for pneumatic looms - Google Patents
Woof preparation device for pneumatic looms Download PDFInfo
- Publication number
- EP0081502B1 EP0081502B1 EP19820901581 EP82901581A EP0081502B1 EP 0081502 B1 EP0081502 B1 EP 0081502B1 EP 19820901581 EP19820901581 EP 19820901581 EP 82901581 A EP82901581 A EP 82901581A EP 0081502 B1 EP0081502 B1 EP 0081502B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- woof
- preparation device
- aforesaid
- controlled
- thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/367—Monitoring yarn quantity on the drum
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
Definitions
- the present invention relates to a woof preparation device for pneumatic looms.
- Woof preparation devices are already known, which mainly consist of a stationary sto ⁇ kdrum on which the woof thread is wound and of mechanical means which, for every shot, separate the necessary number of windings from the following ones and release same for delivery to the main blower of the loom (FR-A-1478294). It is also known to provide a movable thrust piece or blocking component at the delivery end of the aforesaid drum, whereby the delivery of woof thread is prevented during a part of the weaving cycle.
- the object of the invention is now to eliminate the problems mentioned hereinabove.
- a shaft 2 is rotatably mounted in a support 1 mounted on the frame of a pneumatic loom.
- This shaft is made so as to be partially hollow and carries a thread winder 3.
- a stock-drum 4 is rotatably mounted on the shaft 2 .
- the shaft 2 can be driven by means of an electric motor 5, the feeding of which is controlled by two optic detectors 6 and 7.
- a magnet 8 carried by the support 1 cooperates with a little iron block 9 provided in the drum 4 to prevent any rotation of the drum.
- the woof thread 10, coming from a spool 11 passes through shaft 2 and winder 3 in order to be wound by the latter around the drum 4 and reaches further, through a clamp 12, the main blower 13 of the loom.
- a blocking component 14 which can be shifted from the active to the passive position and inversely by means of an electro-magnet 15.
- the motor 5 is fed with current as long as detector 6 does not detect thread and this feeding stops as soon as detector 7 detects thread.
- Means not shown, known themselves in principle, may be provided to ensure the displacement of the windings from one end of the drum to the other.
- the electro-magnet 15 is being controlled either through a determined angular position of the main shaft or by means of the programmation of the loom, whereby the component 14 of the drum 4 becomes retracted (passive position).
- the returning of this component of the active position is controlled, according to the invention, by means of a counter 16 which is provided at the delivery end of the drum 4. In this case this is an optic detector which cooperates with a little mirror 17 carried by the drum 4.
- the detection signals are counted in a counter 18 properly speaking. As soon as a desired number of signals is reached, the feeding of electro-magnet 15 becomes interrupted until it is put again on the programmation at the intervention of the main shaft.
- the drum 4 is preferably of a known type with a continuously adjustable diameter, so that the number of windings that are required per shot may remain constant, whatever the selected weaving breadth. This, however, does not exclude the possibility for the counter 18 to be adjustable.
- the controlling device according to the invention is described hereinafter.
- An oscillator 19 (figure 2) controls an infrared diode of sender-receiver 6.
- the rays that are reflected on a reflecting plane 20 of the stock-drum 4 are received by a photo-transitor, which is amplified in 21 and further rectified in 22 to be sent to the switch 23.
- the switch 23 When the plane 20 is covered by thread, the reflected signal is weak and the rectified signal is non-existent. Switch 23 then remains open.
- a regulating circuit 24 controls a thyristo r 25 so that the motor r 5 sta rts rotating.
- a tachometer with impulse giver 26 delivers a signal which is compared by the regulation circuit 24 with a value set by means of 27. Via the thyristor 25, the circuit 24 regulates the speed of the motor 5 so that it becomes equal to the set value.
- One may set 27, independently of the quantity of woof to be delivered, in such a way that the motor 5 must start and stop a minimum number of times.
- the fixing of the length of woof that is unwound each time takes place through counting a determined number of windings of the drum 4 with a known circumference during the pulling off of the thread and, when this number is reached, controlling the magnet 15 of the blocking component 14.
- the change of the aforesaid number of windings may be seen as a rough adjustment, whilst the fine adjustment is preferably carried out through modifying the circumference of the drum.
- the sender-receiver 16 (figure 3) is a part of a regulating circuit 28 which tries to adjust always in the same working area the signals received by 16, this in order to eliminate the influence of dust deposition on the thread, undesired light and aging.
- This signal is used as a "set" for a flip-flop 30 which via a power stage 31 controls the little magnet 15 either to clamp or to release the thread.
- the detected signal is transmitted to the counter 33 only when both the signal of the control 32 and of the detection 16 are high.
- This counter 33 is adjustable and will, for instance, send a reset signal to the flip-flop only at the third thread.
- the magnet 15 becomes energized and the thread is braked.
- the adjustment of the detector 16 and magnet 15 is such that the magnet, after a count of three, has just the time of a winding left to attract.
- An additional blower 34 is also controlled via a valve 35 by the time burst 29 and is used for increasing the speed of the thread when unwinding; (this blower is in fact an auxiliary blower of the main blower).
- a second valve 36 ensures that in the stopped position there still remains a slight pressure on the main blower 13, so that the thread remains taut. In the case of the net falling out, the valve will be ruled out, whereby an unnecessary unwinding of the woof will be prevented.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
- The present invention relates to a woof preparation device for pneumatic looms.
- Woof preparation devices are already known, which mainly consist of a stationary stoεkdrum on which the woof thread is wound and of mechanical means which, for every shot, separate the necessary number of windings from the following ones and release same for delivery to the main blower of the loom (FR-A-1478294). It is also known to provide a movable thrust piece or blocking component at the delivery end of the aforesaid drum, whereby the delivery of woof thread is prevented during a part of the weaving cycle.
- Under normal circumstances such arrangements work in a satisfactory way. They have, however, the drawback of a possible inaccuracy concerning the number of windings effectively delivered each time. This inaccuracy may result from one or more of the following facts:
- - the aforesaid mechanical separating means work in a rather static manner;
- - these separating means cannot be adjusted according to the thickness of the thread, when one shifts from a thinner to a thicker woof thread or inversely;
- - the aforesaid blocking component is, directly or indirectly exclusively controlled as depending from the angular position of the main shaft of the loom. On the other hand, the introduction speed of the woof on a pneumatic loom is subject to variations from shot to shot and from one kind of thread to another.
- The object of the invention is now to eliminate the problems mentioned hereinabove.
- For, this there is proposed a woof preparation device of the type described hereinabove, wherein, according to the invention, at this delivery end of the stock-drum there is provided a winding counter, whereby the shifting of the aforesaid blocking component, from the retracted position to the blocking position is controlled.
- The invention is more clearly explained hereinafter with the help of an example of execution illustrated by means of the attached schematic drawings. In these drawings,
- Figure 1 shows a schematic side view of a device according to claim 1,
- Figure 2 shows a block diagram of the circuit of the sender-receiver located adjacent to the winding end,
- Figure 3 shows a block diagram of the circuit of the other sender-receiver.
- In a support 1 mounted on the frame of a pneumatic loom a shaft 2 is rotatably mounted. This shaft is made so as to be partially hollow and carries a
thread winder 3. On the shaft 2 a stock-drum 4 is rotatably mounted. The shaft 2 can be driven by means of an electric motor 5, the feeding of which is controlled by twooptic detectors - A
magnet 8 carried by the support 1 cooperates with alittle iron block 9 provided in thedrum 4 to prevent any rotation of the drum. - The
woof thread 10, coming from a spool 11 passes through shaft 2 and winder 3 in order to be wound by the latter around thedrum 4 and reaches further, through aclamp 12, themain blower 13 of the loom. - At the delivery end of the
drum 4, there is provided ablocking component 14, which can be shifted from the active to the passive position and inversely by means of an electro-magnet 15. - The motor 5 is fed with current as long as
detector 6 does not detect thread and this feeding stops as soon asdetector 7 detects thread. - Means not shown, known themselves in principle, may be provided to ensure the displacement of the windings from one end of the drum to the other.
- The electro-
magnet 15 is being controlled either through a determined angular position of the main shaft or by means of the programmation of the loom, whereby thecomponent 14 of thedrum 4 becomes retracted (passive position). The returning of this component of the active position is controlled, according to the invention, by means of acounter 16 which is provided at the delivery end of thedrum 4. In this case this is an optic detector which cooperates with alittle mirror 17 carried by thedrum 4. The detection signals are counted in acounter 18 properly speaking. As soon as a desired number of signals is reached, the feeding of electro-magnet 15 becomes interrupted until it is put again on the programmation at the intervention of the main shaft. - The
drum 4 is preferably of a known type with a continuously adjustable diameter, so that the number of windings that are required per shot may remain constant, whatever the selected weaving breadth. This, however, does not exclude the possibility for thecounter 18 to be adjustable. - The controlling device according to the invention is described hereinafter.
- An oscillator 19 (figure 2) controls an infrared diode of sender-
receiver 6. The rays that are reflected on a reflecting plane 20 of the stock-drum 4 are received by a photo-transitor, which is amplified in 21 and further rectified in 22 to be sent to theswitch 23. When the plane 20 is covered by thread, the reflected signal is weak and the rectified signal is non-existent. Switch 23 then remains open. - If the stock of thread disappears, the rectified signal becomes high, so that the
switch 23 becomes closed. At this moment, a regulatingcircuit 24 controls athyristo r 25 so that the motor r 5 sta rts rotating. A tachometer withimpulse giver 26 delivers a signal which is compared by theregulation circuit 24 with a value set by means of 27. Via thethyristor 25, thecircuit 24 regulates the speed of the motor 5 so that it becomes equal to the set value. - One may set 27, independently of the quantity of woof to be delivered, in such a way that the motor 5 must start and stop a minimum number of times.
- The fixing of the length of woof that is unwound each time takes place through counting a determined number of windings of the
drum 4 with a known circumference during the pulling off of the thread and, when this number is reached, controlling themagnet 15 of theblocking component 14. The change of the aforesaid number of windings may be seen as a rough adjustment, whilst the fine adjustment is preferably carried out through modifying the circumference of the drum. - The sender-receiver 16 (figure 3) is a part of a regulating
circuit 28 which tries to adjust always in the same working area the signals received by 16, this in order to eliminate the influence of dust deposition on the thread, undesired light and aging. - From the
control box 29 of the loom comes a signal which is produced by a time burst given by a clock. - This signal is used as a "set" for a flip-
flop 30 which via apower stage 31 controls thelittle magnet 15 either to clamp or to release the thread. - In 32 there is formed a control area as well of the signals coming from the time control as of the ones of the
receiver 16, this in order to avoid incorrect countings due for instance to dust, between two thread passages. - The detected signal is transmitted to the counter 33 only when both the signal of the
control 32 and of thedetection 16 are high. - This counter 33 is adjustable and will, for instance, send a reset signal to the flip-flop only at the third thread.
- At that moment, the
magnet 15 becomes energized and the thread is braked. The adjustment of thedetector 16 andmagnet 15 is such that the magnet, after a count of three, has just the time of a winding left to attract. - An
additional blower 34 is also controlled via avalve 35 by thetime burst 29 and is used for increasing the speed of the thread when unwinding; (this blower is in fact an auxiliary blower of the main blower). - A
second valve 36 ensures that in the stopped position there still remains a slight pressure on themain blower 13, so that the thread remains taut. In the case of the net falling out, the valve will be ruled out, whereby an unnecessary unwinding of the woof will be prevented. - It is clear that the woof preparation device and circuits described hereinabove can be executed in various shapes.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82901581T ATE12795T1 (en) | 1981-06-17 | 1982-05-26 | THREAD ACCUMULATOR FOR JET WEAVING MACHINES. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2/59215A BE889255A (en) | 1981-06-17 | 1981-06-17 | IMPOSITION PREPARATION DEVICE FOR AIR WINGING |
BE259215 | 1981-06-17 | ||
BE259272 | 1981-07-20 | ||
BE2/59272A BE889677R (en) | 1981-07-20 | 1981-07-20 | Loom with pneumatic weft injection - has weft thread metering drum with electronic controls of wind-on speed and winding release separator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0081502A1 EP0081502A1 (en) | 1983-06-22 |
EP0081502B1 true EP0081502B1 (en) | 1985-04-17 |
Family
ID=25661765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19820901581 Expired EP0081502B1 (en) | 1981-06-17 | 1982-05-26 | Woof preparation device for pneumatic looms |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0081502B1 (en) |
JP (1) | JPS58500952A (en) |
DE (1) | DE3263098D1 (en) |
WO (1) | WO1982004446A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4627474A (en) * | 1982-09-03 | 1986-12-09 | Aktiebolaget Iro | Yarn storing, feeding and measuring device |
SE8207098D0 (en) * | 1982-12-10 | 1982-12-10 | Iro Ab | DEVICE FOR TEMPORES STORAGE AND FEEDING OF FOUND YARN LENGTHS, PREFERRED TO DISHWOVEN MACHINES |
JPS59125946A (en) * | 1982-12-27 | 1984-07-20 | 津田駒工業株式会社 | Multi-color freely exchangeable weft yarn storage apparatus for fluid jet type loom |
JPS59125944A (en) * | 1982-12-27 | 1984-07-20 | 日産自動車株式会社 | Weft yarn feeder of segment loom |
CS249155B1 (en) * | 1984-08-23 | 1987-03-12 | Vladimir Svaty | Method and device for weft thread picking |
FR2576885B1 (en) * | 1985-02-01 | 1987-06-12 | Superba Sa | TEXTILE YARN ACCUMULATOR |
IT1184759B (en) * | 1985-04-22 | 1987-10-28 | Roy Electrotex Spa | WEAPONS FOR WEAVING FRAMES |
EP0286590B1 (en) * | 1987-04-08 | 1991-05-08 | GebràDer Sulzer Aktiengesellschaft | Weft yarn storage device for a loom |
JP2587961B2 (en) * | 1987-10-30 | 1997-03-05 | 津田駒工業株式会社 | Weft length measuring method of weft insertion device |
DE8800216U1 (en) * | 1987-11-29 | 1989-03-30 | Aktiebolaget Iro, Ulricehamn | Device for storing, delivering and measuring a thread |
JPH0387717U (en) * | 1989-12-22 | 1991-09-06 | ||
BE1009172A3 (en) * | 1995-02-28 | 1996-12-03 | Picanol Nv | Gripper loom with shock detection apparatus |
JP7155396B2 (en) * | 2019-03-19 | 2022-10-18 | オリンパス株式会社 | Ultrasound endoscope and insertion tube |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1345166A (en) * | 1961-10-31 | 1963-12-06 | Sobrevin Soc De Brevets Ind Et | Device for the high precision measurement of the length of a wire during its winding |
FR1478294A (en) * | 1966-05-04 | 1967-04-21 | Sulzer Ag | Loom with an intermediate weft thread accumulator |
DE1929485A1 (en) * | 1969-06-11 | 1970-12-17 | Sobrevin | Delivery device for threads on looms, knitting machines or the like. |
NL7612811A (en) * | 1976-11-17 | 1978-05-19 | Rueti Te Strake Bv | DEVICE FOR FORMING A STOCK WRAP FROM A WIRE LEADED FROM A STOCK OF YARN STOCK. |
AT364327B (en) * | 1978-08-09 | 1981-10-12 | Sulzer Ag | ELECTRONIC CONTROL DEVICE FOR A WEAVING MACHINE |
BE889255A (en) * | 1981-06-17 | 1981-12-17 | Picanol Nv | IMPOSITION PREPARATION DEVICE FOR AIR WINGING |
-
1982
- 1982-05-26 WO PCT/BE1982/000011 patent/WO1982004446A1/en active IP Right Grant
- 1982-05-26 DE DE8282901581T patent/DE3263098D1/en not_active Expired
- 1982-05-26 JP JP50166582A patent/JPS58500952A/en active Granted
- 1982-05-26 EP EP19820901581 patent/EP0081502B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0081502A1 (en) | 1983-06-22 |
WO1982004446A1 (en) | 1982-12-23 |
DE3263098D1 (en) | 1985-05-23 |
JPS619423B2 (en) | 1986-03-24 |
JPS58500952A (en) | 1983-06-09 |
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