EP0624674A1 - Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher - Google Patents
Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher Download PDFInfo
- Publication number
- EP0624674A1 EP0624674A1 EP94107218A EP94107218A EP0624674A1 EP 0624674 A1 EP0624674 A1 EP 0624674A1 EP 94107218 A EP94107218 A EP 94107218A EP 94107218 A EP94107218 A EP 94107218A EP 0624674 A1 EP0624674 A1 EP 0624674A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rays
- weft
- transparent plate
- plate
- angle
- 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.)
- Granted
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
- B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
- B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
- B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
- B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
- B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the present invention relates to a weft detecting optical device, particularly for detecting the presence of a reserve of weft and/or the breakage of the weft on weft feeders for looms and textile machines in general, and to a weft feeder including said device.
- weft feeders are units that have a fixed drum on which a rotating arm winds a plurality of turns of thread that form a reserve of weft.
- the reserve turns unwind from the drum on demand of the loom or textile machine, and before the reserve is depleted said rotating arm winds other turns so as to constantly supply the reserve of turns; a series of rods that move in a wavelike manner causes the axial advancement of the turns fed from the base toward the head of the drum of the unit.
- a detection device which is sensitive to the presence of the reserve turns of the thread, activates the rotating arm when the number of said turns of the reserve drops below a preset limit.
- Devices for detecting the presence of the turns of reserve thread based on the use of one or more light ray emitting devices, generally constituted by photodiodes, and of one or more receivers for said light rays, generally constituted by phototransistors, are already known.
- a first method consists in detecting, by means of the phototransistor, or receiver, the change produced by the interference of the thread in the light rays that are emitted by the photodiode and reflected by a mirror on top of which the turns of thread are arranged.
- a second known method consists in detecting the light rays that are reflected by said thread and emitted by said photodiode.
- the change in the reflected light rays produced by the interference of the thread is in fact very small and hard to detect, with the result that the useful signal emitted by the phototransistor is uncertain, very weak and often lower than the evaluation limit with respect to the "noise" threshold corresponding to the ambient lighting.
- the greatest drawback of the second known detection method resides in that the light reflection index is highly affected by the color and count of the thread and this circumstance causes considerable problems in the calibration, which must be changed each time according to the characteristics of the thread being processed. Furthermore, the signal emitted by the phototransistor is greatly affected by the level of the ambient light in this case as well.
- a principal aim of the present invention is essentially to eliminate these severe drawbacks, and within the scope of this general aim, another important object of the invention is to provide an optical device for detecting the presence of reserve turns of weft as specified that is capable of providing a signal of substantial amplitude which is independent of the color, count and kind of the thread being processed.
- a particular and important object of the present invention is to obtain a device that can provide a signal that has a substantially constant value and is independent of the presence and intensity of the ambient light.
- Another object of the invention is to provide a device which is structurally simple, has limited dimensions and is reliable in operation.
- an optical device for detecting the presence of a reserve of weft and/or the breakage of the weft characterized in that it comprises an emitter diode and a phototransistor which are arranged at the same face of a transparent plate which is associated with the drum of the weft feeder and on which the turns of the weft reserve rest; in that the emitter directs onto the transparent plate a beam of incident rays which is tilted at a preset angle of incidence with respect to said plate; and in that the phototransistor receives a beam of rays that emerge from said transparent plate at an angle of reflection, with respect to said plate, which is different from the angle of incidence produced by multiple-reflection means located at the other face of the transparent plate; and in that the incident and/or emerging rays are interrupted by a turn of the reserve of thread when said turn reaches the plate, so as to screen the receiver from the
- the multiple-reflection means include a pair of opposite reflecting surfaces which are mutually orientated so that the beam of incident rays and the beam of emerging rays mutually intersect at a point lying on the surface plane of the transparent plate, so that when a turn of weft is located at said intersection point it interrupts both said incident rays beam and said emerging rays beam, thus screening the phototransistor from the light.
- the reference numeral 10 generally designates the weft feeder, which includes a fixed drum 11 on which a hollow rotating arm 12, rigidly coupled to a driving shaft 13 which is also hollow, winds a plurality of turns of thread F that forms a thread reserve RF.
- the thread On demand of the loom or other textile machine, the thread unwinds from the drum and passes, in a known manner, through a braking means 14 and a thread guiding eyelet 15.
- the thread reserve is constantly compensated by the arm 12 which is activated by a turn presence sensor S and winds new turns of thread onto the drum 11 when the reserve drops below a preset number of turns.
- a series of rods 16 that move in a wavelike manner produces, in a known manner, the axial advancement of the turns fed by the arm 12, by moving them from the base toward the head of the drum 11.
- the turn presence sensor S includes a photodiode 17 and a phototransistor 18, or other equivalent emitter and receiver means, which are arranged at the same face of a plate of transparent material 19 which is provided on the drum 11 and on which the turns of the thread reserve RF rest.
- the photodiode 17 directs onto the transparent plate 19 a beam of incident rays R1 which is inclined with respect to said plate by an angle of incidence ⁇ .
- the phototransistor 18 is arranged along the path of a beam R2 of rays that emerge from the plate 19 at an angle ⁇ , briefly termed reflection angle, with respect to said plate.
- the plate 19 At the face of the plate 19 that is directed toward the drum 11 there are multiple optical reflection means 20 for bending the incident rays R1 so that the angle ⁇ produced by the emerging rays R2 is significantly different from the angle of incidence ⁇ .
- the optical reflection means 20 include a pair of opposite reflecting surfaces 21-22 which are inclined by respective angles ⁇ and ⁇ with respect to the plate and form a reflection triangle.
- the incident rays R1 which are inclined (minus a correction factor due to the refraction of the plate 19) by an angle ⁇ /2 with respect to the first reflecting surface 21, strike said surface at a point of incidence A and are reflected, parallel to the plate 19, onto the surface 22, which they strike in a respective point of incidence B.
- the rays R2 are reflected from this surface onto the plate 19, forming a reflection triangle A-B-V, and emerge from the plate 19 so as to form with it an angle which is equal (minus the refraction correction factor) to twice the reflection angle ⁇ /2 on the surface 22.
- the inclinations ⁇ and ⁇ of the reflecting surfaces 21-22 are chosen so that they are equal to 90 o - ⁇ /2 and 90 o - ⁇ /2 respectively, as clearly shown in figure 3.
- the same figure also shows that the incident rays R1 and the emerging ones R2 mutually intersect at the point V which coincides with the vertex of the reflection triangle and lies on the plane of the plate 19.
- the phototransistor 18 being completely screened from the light, emits a signal "s" that indicates the presence of turns; this signal, in accordance with the stated aim and objects, is fully free from uncertainties and has a constant and substantial amplitude.
- the plate 19 and the reflecting surfaces 21 and 22 can be part of a single optical prism such as 30, in which preferably the outer face of the surfaces 21 and 22 is covered with reflecting material.
- the surfaces 21 and 22 are constituted by individual mirrors which are supported by a container that is closed by the transparent plate 19.
- FIG 4 illustrates the arrangement of a weft feeder such as 10 which includes, in addition to the described sensor S, a second identical sensor S' which is arranged at the base of the drum 11 to detect whether the weft thread F has broken and provide the loom, or other user machine, with a corresponding thread breakage signal.
- a weft feeder such as 10 which includes, in addition to the described sensor S, a second identical sensor S' which is arranged at the base of the drum 11 to detect whether the weft thread F has broken and provide the loom, or other user machine, with a corresponding thread breakage signal.
- Figures 5 and 6 illustrate a different embodiment of the sensor S according to the invention, particularly suitable for very fine or particularly shiny weft threads.
- the incident rays R1 and the emerging ones R2 form, with respect to the plane of the plate 19, respective angles ⁇ and ⁇ that can be indifferently equal or different, and the extensions of said rays mutually intersect at a virtual point V' that lies outside the plate 19 on the side where the photodiode 17 and the phototransistor 18 are located.
- a cup-shaped recess 31 is formed on the plate 19 and accommodates a stud 32 that cooperates with the multiple-reflection means 20.
- the stud 32 which is made of opaque material, can move in contrast with the action of a spring 33 and has an enlarged head 34 shaped like a spherical segment and a stem 35 that extends beyond the bottom of the recess 31, at right angles to the plane of the plate 19, on the side of the reflecting surfaces 21 and 22.
- the stud 32 is normally retained by the spring 33 in the inactive position shown in figure 5, in which the head 34 protrudes with respect to the plate 19.
- the stem 35 lies above the base "1" of the reflection triangle A-B-V' and therefore does not interfere with the rays reflected by the reflecting surface 21 onto the reflecting surface 22. Accordingly, a beam of reflected rays R2 strikes the phototransistor 18.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Quality & Reliability (AREA)
- Looms (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO930323 | 1993-05-10 | ||
ITTO930323A IT1270929B (it) | 1993-05-10 | 1993-05-10 | Dispositivo ottico per rilevare la presenza di riserva di trama e/o la rottura di trama su apparecchi alimentatori di trama per macchine tessili ed apparecchio alimentatore di trama incorporante detto dispositivo |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0624674A1 true EP0624674A1 (de) | 1994-11-17 |
EP0624674B1 EP0624674B1 (de) | 1997-08-06 |
Family
ID=11411474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94107218A Expired - Lifetime EP0624674B1 (de) | 1993-05-10 | 1994-05-09 | Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0624674B1 (de) |
DE (1) | DE69404742T2 (de) |
IT (1) | IT1270929B (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046511A1 (en) * | 1997-04-17 | 1998-10-22 | Giuseppe Vischiani | Device for controlling the accumulation and supply of yarn to textile machines |
EP0873961A2 (de) * | 1997-04-24 | 1998-10-28 | L.G.L. Electronics S.p.A. | Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1288339B (de) * | 1963-10-09 | 1969-01-30 | Reiners | Vorrichtung zur elektro-optischen UEberwachung von Faeden oder aehnlichem Gut |
EP0174039A2 (de) * | 1984-09-04 | 1986-03-12 | Picanol N.V. | Geschwindigkeitsregler für den Fadenspeicher einer Webmaschine |
EP0199059A1 (de) * | 1985-04-22 | 1986-10-29 | ROJ ELECTROTEX S.p.A. | Schussfadenspeicher für eine Webmaschine |
EP0327973A1 (de) * | 1988-02-11 | 1989-08-16 | ROJ ELECTROTEX S.p.A. | Garnlieferungsvorrichtung für Textilmaschinen |
WO1992009516A1 (de) * | 1990-11-26 | 1992-06-11 | Iro Ab | Optische fühleinrichtung |
-
1993
- 1993-05-10 IT ITTO930323A patent/IT1270929B/it active IP Right Grant
-
1994
- 1994-05-09 EP EP94107218A patent/EP0624674B1/de not_active Expired - Lifetime
- 1994-05-09 DE DE69404742T patent/DE69404742T2/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1288339B (de) * | 1963-10-09 | 1969-01-30 | Reiners | Vorrichtung zur elektro-optischen UEberwachung von Faeden oder aehnlichem Gut |
EP0174039A2 (de) * | 1984-09-04 | 1986-03-12 | Picanol N.V. | Geschwindigkeitsregler für den Fadenspeicher einer Webmaschine |
EP0199059A1 (de) * | 1985-04-22 | 1986-10-29 | ROJ ELECTROTEX S.p.A. | Schussfadenspeicher für eine Webmaschine |
EP0327973A1 (de) * | 1988-02-11 | 1989-08-16 | ROJ ELECTROTEX S.p.A. | Garnlieferungsvorrichtung für Textilmaschinen |
WO1992009516A1 (de) * | 1990-11-26 | 1992-06-11 | Iro Ab | Optische fühleinrichtung |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046511A1 (en) * | 1997-04-17 | 1998-10-22 | Giuseppe Vischiani | Device for controlling the accumulation and supply of yarn to textile machines |
EP0873961A2 (de) * | 1997-04-24 | 1998-10-28 | L.G.L. Electronics S.p.A. | Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement |
EP0873961A3 (de) * | 1997-04-24 | 2000-06-28 | L.G.L. Electronics S.p.A. | Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement |
CN1088680C (zh) * | 1997-04-24 | 2002-08-07 | L·G·L·电子股份公司 | 监视输纬器中纬纱储备的光学探测器及包括它的输纬器 |
Also Published As
Publication number | Publication date |
---|---|
EP0624674B1 (de) | 1997-08-06 |
IT1270929B (it) | 1997-05-16 |
DE69404742D1 (de) | 1997-09-11 |
ITTO930323A0 (it) | 1993-05-10 |
ITTO930323A1 (it) | 1994-11-10 |
DE69404742T2 (de) | 1998-01-08 |
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