EP1801273B1 - Weft stock detector for weft feeders - Google Patents
Weft stock detector for weft feeders Download PDFInfo
- Publication number
- EP1801273B1 EP1801273B1 EP20060021600 EP06021600A EP1801273B1 EP 1801273 B1 EP1801273 B1 EP 1801273B1 EP 20060021600 EP20060021600 EP 20060021600 EP 06021600 A EP06021600 A EP 06021600A EP 1801273 B1 EP1801273 B1 EP 1801273B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weft
- drum
- feeler
- slot
- stock detector
- 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.)
- Not-in-force
Links
- 230000000284 resting effect Effects 0.000 claims description 12
- 230000005484 gravity Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
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
Definitions
- the present invention relates to an improved weft stock detector for weft feeders.
- the weft feeders for textile machines comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft stock.
- the loops are unwound from the drum, pass through a yarn guide eyelet and then and are fed to the loom.
- a weft stock detector which generally includes two swinging feeler arms which are arranged at the opposite ends of the drum and are biased against the drum, e.g., by springs and/or by gravity, and a third swinging feeler arm arranged at a middle position, which has the aim of detecting any breaking of the yarn.
- the feeler arms each can swing between a resting position lowered towards the drum and an active, lifted position, in relation to the presence/absence of loops on the drum in the area engaged by the arm.
- Photoelectric cells detect the movements of the feeler arms and are connected to send signals to a control unit which, on the basis of the received signals, pilots the rotation of the swivel arm in order to maintain the weft stock substantially constant on the drum, within the limits defined by the positions of the two outermost feeler arms.
- WO 99/30999 discloses a weft stock detector according to the preamble of claim 1.
- the detectors of the above type have the drawback that they are often inaccurate with thin yarns, because in this case the movement of the arms from the active position to the resting position, and vice versa, is very slight so that the photoelectric-cells are not capable of detecting it. Accordingly, these detection failures affect the reliability of the weft stock detector.
- a weft feeder 10 for textile machines comprises a stationary drum 12 having longitudinal grooves 13 on its surface, on which a swivel arm 14, which is driven by a motor 15 piloted by a control unit CU (only diagrammatically shown in Fig. 3 ), winds a plurality of yarn loops forming a weft reserve or stock RT.
- yarn F is unwound from the drum, passes through a yarn-guide eyelet 16 supported at the free end of a stationary arm 17 projecting from the motor housing parallel to the axis of the drum, and then is fed to the loom.
- Stationary arm 17 also supports a weft stock detector 18 for controlling the weft reserve on the drum.
- weft stock detector 18 comprises a housing 20 supporting three feeler arms 22, 24, 26 hinged to respective pins 28, 30, 32 parallel to one another. Two of these feeler arms 22, 26 are arranged near the opposite ends of the drum, while the third feeler arm 24 is arranged at a middle position.
- the arms each comprise a U-shaped metal rod 34 ( Fig. 2 ) whose free ends are attached to an anchor body 36 integral with a bush 38 that is hinged to a respective one of the pins 32.
- the curved end 34a of the U is slanting at an angle with respect to the two parallel branches in the running direction of the yarn, and is biased against drum 12 by magnetic action of mutual repulsion between a first permanent magnet 39a incorporated in a projection 40 projecting from bush 38 on the opposite side of the pin, and a second stationary magnet 39b having the same polarity, which is supported in front of first magnet 39a.
- the feeler arms each can swing between a lowered resting position, when there are no yarn loops wound on the drum in the area engaged by the arm, and a lifted active position, when there are yarn loops. In the resting position ( Fig.
- the curved end or contact end 34a of the feeler arm is received in one of the longitudinal grooves 13 on the drum, while the free end 40a of projection 40 is abutted against an abutment 41 integral with housing 20.
- the yarn loops wound on drum 12 in the area below the feeler arm cause the arm to lift from its resting position.
- a photoelectric cell 42 is attached to housing 20 above bush 38 for detecting the movements of the feeler arm.
- Photoelectric cell 42 is shaped as an upside down U, with two opposite longitudinal walls 44, 46 ( Fig. 6 ) which respectively house an emitting diode 47 connected to a power supply AL (which is only diagrammatically shown in Fig. 6 ) and generating a stream of photons through a narrow rectilinear vertical slot 48 ( Figs. 4, 7 ), and a photodiode 50 arranged in front of slot 48 and connected to control unit CU.
- a gap is defined between the walls, in which a thin protrusion 52 is insertable which is frontally formed on projection 40 and is delimited by a rectilinear edge 54 extending radially from bush 38 in a position such that it is aligned to the outer vertical edge (i.e., the right edge in the Figures) of slot 48 when the feeler arm is at rest ( Fig. 7 ). Therefore, thin protrusion 52 defines a shield that obscures slot 48 and breaks off the stream of photons when the feeler arm is at rest.
- Photoelectric cell 42 is connected to send position signals to control unit CU, which is programmed to pilot the rotation of swivel arm 14 on the basis of the received signals, in such a way as to maintain the weft stock RT substantially constant within the limits defined by the positions of the two outermost feeler arms 22, 26.
- the intermediate feeler arm 24 has the aim of detecting any breaking of the yarn.
- the programming of control unit CU is not within the scope of the present invention because it belongs to the normal knowledge of the person skilled in the art, and therefore no further description will be given about it.
- Photoelectric cell 46 is anchored to the upper side of housing 20 by means of a U-shaped anchor member 56 which also defines the above-cited abutment 41 against which the free end 40a of projection 40 abuts when the feeler arm is in its resting position.
- a magnetic sensor 58 is mounted on housing 20 and is arranged in such a way as to detect the movements of first magnet 39a mounted on the feeler arm.
- Magnetic sensor 46 is also connected to send position signals to control unit CU and can be adjusted to cooperate with the photoelectric cell, e.g., for giving two subsequent position signals in relation to the position of the feeler arm, or for performing other combined or alternate detections, such as can be easily contrived by the person skilled in the art.
- feeler arms 22, 24, 26 are biased against drum 12 by gravity and by mutual repulsion between the magnets 39a, 39b, with a lever-type action about the fulcrum defined by the axes of the pins, and can swing between the lowered resting position and the lifted active position in relation to the absence/presence of loops on the drum.
- Figs. 4, 5 show the weft stock detector in association with a thin yarn FS, in an active position and in a resting position respectively. As shown in Fig.
- the feeler arm makes a very slight movement from its resting position, such as the movement determined by a loop of a very thin yarn, to cause protrusion 52 to immediately and completely uncover slot 48.
- this circumstance makes the weft stock detector much more sensitive and reactive in detecting very slight movements of the feeler arms, even in case of very thin yarns.
- feeler arm could be biased against the drum by biasing means other than the magnets, e.g., by spring, or only by gravity.
- biasing means other than the magnets, e.g., by spring, or only by gravity.
- sensor magnet 58 should be intended as useful but not indispensable to carry out the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
- The present invention relates to an improved weft stock detector for weft feeders.
- As known, the weft feeders for textile machines comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft stock. Upon request from the loom, the loops are unwound from the drum, pass through a yarn guide eyelet and then and are fed to the loom.
- With weft feeders of the above type, the weft stock on the drum is controlled by a weft stock detector which generally includes two swinging feeler arms which are arranged at the opposite ends of the drum and are biased against the drum, e.g., by springs and/or by gravity, and a third swinging feeler arm arranged at a middle position, which has the aim of detecting any breaking of the yarn. The feeler arms each can swing between a resting position lowered towards the drum and an active, lifted position, in relation to the presence/absence of loops on the drum in the area engaged by the arm. Photoelectric cells detect the movements of the feeler arms and are connected to send signals to a control unit which, on the basis of the received signals, pilots the rotation of the swivel arm in order to maintain the weft stock substantially constant on the drum, within the limits defined by the positions of the two outermost feeler arms.
WO 99/30999 - The detectors of the above type have the drawback that they are often inaccurate with thin yarns, because in this case the movement of the arms from the active position to the resting position, and vice versa, is very slight so that the photoelectric-cells are not capable of detecting it. Accordingly, these detection failures affect the reliability of the weft stock detector.
- Therefore, it is a main object of the present invention to improve the above weft stock detector in order to make it more sensitive and reactive in detecting slight movements of the feeler arms even with very thin yarns.
- The above object and other advantages, which will better appear below, are achieved by an improved weft stock detector having the features recited in claim 1, while the dependent claims state other advantageous, though secondary features of the invention.
- The invention will be now described in more detail with reference to a preferred, non-exclusive embodiment, shown by way of non limiting example in the attached drawings, wherein:
-
Fig. 1 is a view in side elevation of a weft feeder provided with a weft stock detector according to the invention; -
Fig. 2 is a front view to a slightly enlarged scale of the weft feeder ofFig. 1 in association with the drum of the feeder; -
Fig. 3 is a view in cross section ofFig. 2 along line III-III; -
Figs. 4, 5 show a detail ofFig. 3 to a considerably enlarged scale in two different operative configurations; -
Fig. 6 is a view in cross section ofFig. 5 along line VI-VI; -
Fig. 7 shows a detail ofFig. 5 to an enlarged scale. - With initial reference to
Fig. 1 , a weft feeder 10 for textile machines comprises astationary drum 12 havinglongitudinal grooves 13 on its surface, on which aswivel arm 14, which is driven by amotor 15 piloted by a control unit CU (only diagrammatically shown inFig. 3 ), winds a plurality of yarn loops forming a weft reserve or stock RT. Upon request from the loom, yarn F is unwound from the drum, passes through a yarn-guide eyelet 16 supported at the free end of astationary arm 17 projecting from the motor housing parallel to the axis of the drum, and then is fed to the loom.Stationary arm 17 also supports aweft stock detector 18 for controlling the weft reserve on the drum. - Having now particular reference to
Figs. 2-7 ,weft stock detector 18 comprises ahousing 20 supporting threefeeler arms respective pins feeler arms 22, 26 are arranged near the opposite ends of the drum, while thethird feeler arm 24 is arranged at a middle position. With particular reference now toFigs. 2 ,4-7 , where theoutermost feeler arm 26 is shown in detail, the arms each comprise a U-shaped metal rod 34 (Fig. 2 ) whose free ends are attached to ananchor body 36 integral with abush 38 that is hinged to a respective one of thepins 32. Thecurved end 34a of the U is slanting at an angle with respect to the two parallel branches in the running direction of the yarn, and is biased againstdrum 12 by magnetic action of mutual repulsion between a firstpermanent magnet 39a incorporated in aprojection 40 projecting frombush 38 on the opposite side of the pin, and a second stationary magnet 39b having the same polarity, which is supported in front offirst magnet 39a. The feeler arms each can swing between a lowered resting position, when there are no yarn loops wound on the drum in the area engaged by the arm, and a lifted active position, when there are yarn loops. In the resting position (Fig. 5 ), the curved end orcontact end 34a of the feeler arm is received in one of thelongitudinal grooves 13 on the drum, while the free end 40a ofprojection 40 is abutted against anabutment 41 integral withhousing 20. In the active position (Fig. 4 ), the yarn loops wound ondrum 12 in the area below the feeler arm cause the arm to lift from its resting position. - A
photoelectric cell 42 is attached to housing 20 abovebush 38 for detecting the movements of the feeler arm.Photoelectric cell 42 is shaped as an upside down U, with two oppositelongitudinal walls 44, 46 (Fig. 6 ) which respectively house anemitting diode 47 connected to a power supply AL (which is only diagrammatically shown inFig. 6 ) and generating a stream of photons through a narrow rectilinear vertical slot 48 (Figs. 4, 7 ), and aphotodiode 50 arranged in front ofslot 48 and connected to control unit CU. A gap is defined between the walls, in which athin protrusion 52 is insertable which is frontally formed onprojection 40 and is delimited by a rectilinear edge 54 extending radially frombush 38 in a position such that it is aligned to the outer vertical edge (i.e., the right edge in the Figures) ofslot 48 when the feeler arm is at rest (Fig. 7 ). Therefore,thin protrusion 52 defines a shield that obscuresslot 48 and breaks off the stream of photons when the feeler arm is at rest.Photoelectric cell 42 is connected to send position signals to control unit CU, which is programmed to pilot the rotation ofswivel arm 14 on the basis of the received signals, in such a way as to maintain the weft stock RT substantially constant within the limits defined by the positions of the twooutermost feeler arms 22, 26. Theintermediate feeler arm 24 has the aim of detecting any breaking of the yarn. The programming of control unit CU is not within the scope of the present invention because it belongs to the normal knowledge of the person skilled in the art, and therefore no further description will be given about it.Photoelectric cell 46 is anchored to the upper side ofhousing 20 by means of a U-shapedanchor member 56 which also defines the above-citedabutment 41 against which the free end 40a ofprojection 40 abuts when the feeler arm is in its resting position. Amagnetic sensor 58 is mounted onhousing 20 and is arranged in such a way as to detect the movements offirst magnet 39a mounted on the feeler arm.Magnetic sensor 46 is also connected to send position signals to control unit CU and can be adjusted to cooperate with the photoelectric cell, e.g., for giving two subsequent position signals in relation to the position of the feeler arm, or for performing other combined or alternate detections, such as can be easily contrived by the person skilled in the art. - In the operation, feeler
arms drum 12 by gravity and by mutual repulsion between themagnets 39a, 39b, with a lever-type action about the fulcrum defined by the axes of the pins, and can swing between the lowered resting position and the lifted active position in relation to the absence/presence of loops on the drum.Figs. 4, 5 show the weft stock detector in association with a thin yarn FS, in an active position and in a resting position respectively. As shown inFig. 4 , with the above-described embodiment according to the invention it is sufficient for the feeler arm to make a very slight movement from its resting position, such as the movement determined by a loop of a very thin yarn, to causeprotrusion 52 to immediately and completely uncoverslot 48. As the person skilled in the art will immediately understand, this circumstance makes the weft stock detector much more sensitive and reactive in detecting very slight movements of the feeler arms, even in case of very thin yarns. - A preferred embodiment of the invention has been described herein, but of course many changes may be made by the person skilled in the art within the scope of the claims. In particular, the feeler arm could be biased against the drum by biasing means other than the magnets, e.g., by spring, or only by gravity. Furthermore, the presence of
sensor magnet 58 should be intended as useful but not indispensable to carry out the invention.
Claims (4)
- A weft stock detector for weft feeders provided with a stationary drum (12) on which yarn loops are wound to form a weft stock (RT), comprising at least two feeler arms (22, 24, 26) hinged by side of the drum about respective axes (28, 30, 32) and biased against the drum with their respective contact ends (34a) for swinging between an active lifted position and a lowered resting postion in relation to the presence/absence of loops on the drum, and respective photoelectric cells (42) arranged to detect the movements of the feeler arms, characterized in that said photoelectric cells each comprise an emitting diode (47) connected to generate a stream of photons through an elongated narrow slot (48) extending in a substantially radial direction with respect to the pin (32), and a photodiode (50) in front of the slot (48), and in that said feeler arms are each provided with a shield (52) insertable between the diode and the photodiod and delimited frontally by a rectilinear edge (54) that is aligned to the outer edge of the slot (48), with the feeler arm in its resting position, thereby obscuring the slot (48) and breaking off the stream of photons.
- The weft stock detector of claim 1, characterized in that said shield (52) is positioned at the opposite side of the axis (32) with respect to the contact end (34a).
- The weft stock detector of claim 1 or 2, characterized in that said feeler arm has a projection (40) on the opposite side of the axis (32) with respect to the contact end (34a), which is shaped fo abutting against a stationary abutment (41) with the feeler arm in its resting position.
- The wef stock detector of claim 3, characterized in that said shield (52) consists of a thin protrusion (52) formed frontally on said projection (40).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO20050893 ITTO20050893A1 (en) | 2005-12-22 | 2005-12-22 | STOCK DETECTOR WEIGHING PERFECTED FOR PLOT FOOD DEVICES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1801273A2 EP1801273A2 (en) | 2007-06-27 |
EP1801273A3 EP1801273A3 (en) | 2009-04-29 |
EP1801273B1 true EP1801273B1 (en) | 2010-07-07 |
Family
ID=37865736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060021600 Not-in-force EP1801273B1 (en) | 2005-12-22 | 2006-10-16 | Weft stock detector for weft feeders |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1801273B1 (en) |
CN (1) | CN1986929B (en) |
DE (1) | DE602006015277D1 (en) |
IT (1) | ITTO20050893A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20111217A1 (en) * | 2011-12-28 | 2013-06-29 | Lgl Electronics Spa | MILLING-PLANE DEVICE FOR FIXED DRUM YARN FEEDERS |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19756243A1 (en) * | 1997-12-17 | 1999-06-24 | Iro Ab | Thread delivery device |
ITTO980520A1 (en) * | 1998-06-16 | 1999-12-16 | Lgl Electronics Spa | IMPROVEMENT OF YARN RESERVE SURVEILLANCE DEVICES IN WEFT FEEDING UNITS WITH WEAVING LOOMS. |
-
2005
- 2005-12-22 IT ITTO20050893 patent/ITTO20050893A1/en unknown
-
2006
- 2006-10-16 DE DE200660015277 patent/DE602006015277D1/en active Active
- 2006-10-16 EP EP20060021600 patent/EP1801273B1/en not_active Not-in-force
- 2006-12-20 CN CN2006101711877A patent/CN1986929B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE602006015277D1 (en) | 2010-08-19 |
EP1801273A2 (en) | 2007-06-27 |
CN1986929B (en) | 2011-05-25 |
ITTO20050893A1 (en) | 2007-06-23 |
CN1986929A (en) | 2007-06-27 |
EP1801273A3 (en) | 2009-04-29 |
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