GB1581119A - Circular loom including means for arresting motion of the weft spool thereof - Google Patents
Circular loom including means for arresting motion of the weft spool thereof Download PDFInfo
- Publication number
- GB1581119A GB1581119A GB13541/78A GB1354178A GB1581119A GB 1581119 A GB1581119 A GB 1581119A GB 13541/78 A GB13541/78 A GB 13541/78A GB 1354178 A GB1354178 A GB 1354178A GB 1581119 A GB1581119 A GB 1581119A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flaps
- weft
- weft spool
- spool
- light
- 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
Links
- 230000000694 effects Effects 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 2
- 241000237074 Centris Species 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004329 water eliminated fourier transform Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/18—Automatic stop motions
- D03D51/34—Weft stop motions
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
To monitor the weft thread, there is provided at least one light barrier, which consists of a light source (7), of a photocell and of a reflector (6) and which stops the drive motor of the circular loom in the event of a thread break. It is essential that the reflector (6) be arranged on the rotatable weft-thread bobbin (3) and be coverable by means of a plurality of flaps (10). The flaps (10) are mounted on the bobbin (3) so as to be essentially freely pivotable and can pivot out in the radial direction under the effect of centrifugal force. The pivot axes (11) of the said flaps (10) are arranged essentially parallel and at a distance from the axis of rotation of the weft-thread bobbin. <IMAGE>
Description
(54) A CIRCULAR LOOM INCLUDING MEANS FOR ARRESTING MOTION
OF THE WEFT SPOOL THEREOF
(71) We, STARLINGER & CO. GESELL
SCHAFT m.b.H., an Austrian Company, of
Sonnenuhrgasse 4, A-1060 Vienna, Austria, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to a circular loom including means for arresting motion of the weft spool thereof. A circular loom has at least one curved shuttle guided in a circular path and a weft spool rotatably mounted within the shuttle.
It is known to employ at least one light beam from a light source or a photocell and a reflector for monitoring the weft and putting the driving motor of the circular loom out of operation in the event of weft breakage.
Various devices in which a light beam is provided for monitoring the weft are known.
These light beams are either arranged in the path of the weft itself or monitor the course of the shuttle so as to stop the drive of the circular loom in the event of weft breakage.
However, the mode of operation of these known devices is often unsatisfactory.
The invention provides a circular loom including
a shuttle arranged to travel in a circular path,
a shuttle drive for driving the shuttle in the circular path,
a weft spool carried by and rotatable relative to the shuttle and having a surface at least a portion of which is light reflective
a light source capable of transmitting light towards the light reflective surface portion,
a shuttle drive control including a light receiver capable of receiving light reflected from the reflective surface portion, the control being arranged to control the shuttle drive in dependence on the output of the light receiver,
a plurality of flaps pivotably mounted on respective pivots, which flaps rotate with the weft spool and are substantially parallel to and spaced apart from one another around the axis of the weft spool, the flaps being arranged to pivot centrifugally on their pivots when the weft spool rotates about its axis so that they occupy a first position when the weft spool is rotating normally and at least some of them occupy a second position when the weft spool is not rotating about its axis, in one of which positions the light is reflected from the reflective surface and in the other of which it is not, whereby the reflection of light to the light receiver is indicative of the state of rotation of the weft spool.
Thus, in a loom of the invention, the weft spool (sometimes called a bobbin) itself is thus monitored.
Preferably, each flap has a free end and a said pivot at its opposite end. The flaps may, when in the first position hang freely, under gravity, from their respective pivots, their pivotal rotation being limited only by any stops which may be provided as later described or by the proximity of the weft spool.
Conveniently, the light source is disposed generally above the weft spool and, when the weft spool is at rest and the flaps are in the second position, at least those flaps in the region of the light beam from the light source extend generally radially of the weft spool, thus allowing the light beam and the reflected light from the reflective surface portion of the weft spool to pass between adjacent radially extending flaps. The light source is preferably arranged so that the light beam travels obliquely relative to the reflective surface of the weft spool.
It is of advantage for the reflective surface portion to extend essentially over an entire circumference of the weft spool.
In a particularly preferred embodiment of the invention, the pivot of each flap acts as a stop for the next adjacent flap circumferentially of the weft spool, to hold the flap in the said first position.
Such a preferred embodiment operates as follows. At correct insertion of the thread, the weft spool turns and the pivotably mounted flaps are caused to rotate away from the said second position, the free ends of the flaps moving generally in a radial direction away from the weft spool under the effect of centri fugal force until the flaps reach the said first position in which they cover the reflective surface portion of the weft spool. When pivoted outwardly, the flaps abut the pivots to form an essentially closed surface surrounding the reflective surface. At weft breakage, however, the weft spool stops and the free ends of the pivotably mounted flaps pivot toward the weft spool the flaps thus returning to their second starting position so that they no longer cover the reflector.A light ray emitted by the light source is reflected by the reflective surface portion and releases an impulse which is used for stopping the drive of the circular loom.
The use of pivoting flaps in the light path of an optical rotation monitoring device is known from US Patent Specification No.
3 553 467. The present invention, however, relates to circular looms including means for arresting circular motion of a weft spool and thus differs from the known device in this respect. Moreover, unlike preferred embodiments of the present invention, the flaps in the known device are not pivoted outwardly by the effect of centrifugal force in order to cover the reflector on rotation. Instead, in the known device the flaps fall down under the force of gravity when the device stops and thus interrupt the path of light. A further difference between a loom embodying the invention and the known device resides in the fact that in the loom embodying the invention the flaps are arranged at a distance from the axis of rotation of the weft spool, while in the known device, they are mounted coaxially with the axis of rotation of the rotor.
A circular loom embodying the invention will now be described in more detail with reference to the accompaying diagrammatic drawing in which:
Fig. 1 shows a shuttle of a circular loom according to the invention including a weft spool and means associated with the weft spool for arresting the motion of the shuttle in the event of breakage of the weft;
Fig. 2 a sectional view of the weft spool along line II--II in Fig. 1 with associated flaps in the position which they assume during rotation of the weft spool; and
Fig. 3 a sectional view of the weft spool shown in Fig. 2, but with the spool in an inoperative, non-rotating, condition, i.e. at weft breakage.
Fig. 1 shows a curved shuttle 1 of a circular loom guided along a circular path 2. A weft spool (bobbin) 3 is rotatably mounted in the shuttle 1, the weft 4 being pulled off the weft spool 3 over a yarn guide 5 during motion of the shuttle 1 along the circular path 2. The shuttle 1 is driven by a shuttle drive motor 8 (not shown in detail in the drawing).
The rotatable weft spool 3, whose axis of rotation extends essentially horizontally, is provided at one portion of its surface with a reflective coating 6 which extends essentially over an entire circumferential region of the weft spool. Associated with this reflective coating 6 are a light source 7 and shuttle drive control including a photocell capable of receiving light reflected from the reflective coating 6 and, on receiving this light, sending impulses to a relay 9 of the shuttle drive control arranged in the circuit of the drive motor 8 of the circular loom.
The rotatably mounted weft spool 3 is further provided with a plurality of flaps 10 rotatable with the weft spool 3 and disposed circumferentially around the reflective coating 6, which flaps 10 are capable of pivotal rotation, relative to the weft spool 3, about respective pivot axes 11. The pivot axes 11 of the flaps 10 extend essentially parallel to the pivot axis of the weft spool 3 and are circumferentially spaced from one another. The width of the flaps 10 measured in a generally circumferential direction is greater than the distance of the axes 11 from one another and a stop is provided along each axis, so that the stop on the pivot axis of each adjacent flap serves as a stop for limiting outward pivotal rotation of the flap.
As shown in Fig. 2, the flaps 10 pivot outwardly on rotation of the weft spool 3 and form a continuous shield surrounding the reflective coating 6. On yarn breakage, however (when the rotating motion of the spool 3 stops), the flaps 10 pivot inwardly and return to their original position. This position is shown in Fig. 3. The light ray emitted by the light source 7 is thus reflected by the no longer covered reflector 6, as represented in
Fig. 3 in broken lines. This reflection generates an impulse received by relay 9 which stops the driving motor of the circular loom.
Within the scope of the invention, various modifications are possible. For instance, the flaps 10 can be connected to the weft spool 3 at each of the opposite lateral edges of the flaps or can be hung on a frame including frame elements extending radially from region spaced apart axially on the weft spool and a frame element extending axially between the radially extending elements. In addition, the flaps may take the form of lids, shutters or vanes. The reflective surface can be formed of one piece or of individual sections. In particular, the reflector can consist of individual, speckled, reflecting elements. The flaps as such are preferably made of plastics material and can be formed integrally with a looped portion capable of surrounding a pivot pin to provide the pivot axis.
WHAT WE CLAIM IS:
1. A circular loom including
a shuttle arranged to travel in a circular path,
a shuttle drive for driving the shuttle in the circular path,
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
- **WARNING** start of CLMS field may overlap end of DESC **.fugal force until the flaps reach the said first position in which they cover the reflective surface portion of the weft spool. When pivoted outwardly, the flaps abut the pivots to form an essentially closed surface surrounding the reflective surface. At weft breakage, however, the weft spool stops and the free ends of the pivotably mounted flaps pivot toward the weft spool the flaps thus returning to their second starting position so that they no longer cover the reflector. A light ray emitted by the light source is reflected by the reflective surface portion and releases an impulse which is used for stopping the drive of the circular loom.The use of pivoting flaps in the light path of an optical rotation monitoring device is known from US Patent Specification No.3 553 467. The present invention, however, relates to circular looms including means for arresting circular motion of a weft spool and thus differs from the known device in this respect. Moreover, unlike preferred embodiments of the present invention, the flaps in the known device are not pivoted outwardly by the effect of centrifugal force in order to cover the reflector on rotation. Instead, in the known device the flaps fall down under the force of gravity when the device stops and thus interrupt the path of light. A further difference between a loom embodying the invention and the known device resides in the fact that in the loom embodying the invention the flaps are arranged at a distance from the axis of rotation of the weft spool, while in the known device, they are mounted coaxially with the axis of rotation of the rotor.A circular loom embodying the invention will now be described in more detail with reference to the accompaying diagrammatic drawing in which: Fig. 1 shows a shuttle of a circular loom according to the invention including a weft spool and means associated with the weft spool for arresting the motion of the shuttle in the event of breakage of the weft; Fig. 2 a sectional view of the weft spool along line II--II in Fig. 1 with associated flaps in the position which they assume during rotation of the weft spool; and Fig. 3 a sectional view of the weft spool shown in Fig. 2, but with the spool in an inoperative, non-rotating, condition, i.e. at weft breakage.Fig. 1 shows a curved shuttle 1 of a circular loom guided along a circular path 2. A weft spool (bobbin) 3 is rotatably mounted in the shuttle 1, the weft 4 being pulled off the weft spool 3 over a yarn guide 5 during motion of the shuttle 1 along the circular path 2. The shuttle 1 is driven by a shuttle drive motor 8 (not shown in detail in the drawing).The rotatable weft spool 3, whose axis of rotation extends essentially horizontally, is provided at one portion of its surface with a reflective coating 6 which extends essentially over an entire circumferential region of the weft spool. Associated with this reflective coating 6 are a light source 7 and shuttle drive control including a photocell capable of receiving light reflected from the reflective coating 6 and, on receiving this light, sending impulses to a relay 9 of the shuttle drive control arranged in the circuit of the drive motor 8 of the circular loom.The rotatably mounted weft spool 3 is further provided with a plurality of flaps 10 rotatable with the weft spool 3 and disposed circumferentially around the reflective coating 6, which flaps 10 are capable of pivotal rotation, relative to the weft spool 3, about respective pivot axes 11. The pivot axes 11 of the flaps 10 extend essentially parallel to the pivot axis of the weft spool 3 and are circumferentially spaced from one another. The width of the flaps 10 measured in a generally circumferential direction is greater than the distance of the axes 11 from one another and a stop is provided along each axis, so that the stop on the pivot axis of each adjacent flap serves as a stop for limiting outward pivotal rotation of the flap.As shown in Fig. 2, the flaps 10 pivot outwardly on rotation of the weft spool 3 and form a continuous shield surrounding the reflective coating 6. On yarn breakage, however (when the rotating motion of the spool 3 stops), the flaps 10 pivot inwardly and return to their original position. This position is shown in Fig. 3. The light ray emitted by the light source 7 is thus reflected by the no longer covered reflector 6, as represented in Fig. 3 in broken lines. This reflection generates an impulse received by relay 9 which stops the driving motor of the circular loom.Within the scope of the invention, various modifications are possible. For instance, the flaps 10 can be connected to the weft spool 3 at each of the opposite lateral edges of the flaps or can be hung on a frame including frame elements extending radially from region spaced apart axially on the weft spool and a frame element extending axially between the radially extending elements. In addition, the flaps may take the form of lids, shutters or vanes. The reflective surface can be formed of one piece or of individual sections. In particular, the reflector can consist of individual, speckled, reflecting elements. The flaps as such are preferably made of plastics material and can be formed integrally with a looped portion capable of surrounding a pivot pin to provide the pivot axis.WHAT WE CLAIM IS: 1. A circular loom including a shuttle arranged to travel in a circular path, a shuttle drive for driving the shuttle in the circular path,a weft spool carried by and rotatable relative to the shuttle and having a surface at least a portion of which is light reflective.a light source capable of transmitting light towards the light reflective surface portion, a shuttle drive control including a light receiver capable of receiving light reflected from the reflective surface portion, the control being arranged to control the shuttle drive in dependence on the output of the light receiver.a plurality of flaps pivotably mounted on respective pivots, which flaps rotate with the weft spool and are substantially parallel to and spaced apart from one another around the axis of the weft spool, the flaps being arranged to pivot centrifugally on their pivots when the weft spool rotates about its axis so that they occupy a first position when the weft spool is rotating normally and at least some of them occupy a second position when the weft spool is not rotating abojt its axis, in one of which positions the light is reflected from the reflective surface and in the other of which it is not, whereby the reflection of light to the light receiver is indicative of the state of rotation of the weft spool.
- 2. A circular loom according to claim 1, wherein the pivot of each flap acts as a stop for the next adjacent flap circumferentially of the weft spool, to hold the flap in the said first position.
- 3. A circular loom according to claim 1 or claim 2, wherein each flap has a free end and a said pivot at the opposite end.
- 4. A circular loom according to any one of the preceding claims, wherein the light source is disposed generally above the weft spool and when the weft spool is at rest and the flaps are in the second position, at least those flaps in the region of the light beam from the light source extend generally radially of the weft spool, thus allowing the light beam and the reflected light from the reflective surface portion of the weft spool to pass between radially extending flaps.
- 5. A circular loom according to claim 4, wherein at least those flaps in the region of the light beam are free to hang vertically from their respective pivots.
- 6. A circular loom according to claim 4 or claim 5, wherein the light beam travels obliquely relative to the reflective surface of the weft spool.
- 7. A circular loom according to any one of the preceding claims, wherein the said reflective surface portion of the weft spool extends over an entire circumference thereof.
- 8. A circular loom according to any one of the preceding claims, which circular loom is substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT250577A AT352647B (en) | 1977-04-08 | 1977-04-08 | WEFT GUARD FOR CIRCULAR WEAVING MACHINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1581119A true GB1581119A (en) | 1980-12-10 |
Family
ID=3535486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13541/78A Expired GB1581119A (en) | 1977-04-08 | 1978-04-06 | Circular loom including means for arresting motion of the weft spool thereof |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS53126360A (en) |
| AT (1) | AT352647B (en) |
| CH (1) | CH627800A5 (en) |
| DE (1) | DE2814280C2 (en) |
| ES (1) | ES468636A1 (en) |
| FR (1) | FR2386629A1 (en) |
| GB (1) | GB1581119A (en) |
| IT (1) | IT1102454B (en) |
| PT (1) | PT67880B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PH16162A (en) * | 1978-08-25 | 1983-07-18 | Torii Winding Machine Co | A mechanism for stopping a circular loom during weaving operation |
| DE2926388C2 (en) * | 1979-06-29 | 1984-10-04 | Windmöller & Hölscher, 4540 Lengerich | Guards for circular looms with a device for indicating a thread break |
| DE59408732D1 (en) * | 1994-11-07 | 1999-10-14 | Rueti Ag Maschf | Weft feeder device |
| CN104452050B (en) * | 2014-12-14 | 2016-07-06 | 泰隆经纬(郑州)塑业有限公司 | A kind of parallel that is provided with lacks the woven bag circular loom of line arresting gear |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH384497A (en) * | 1960-12-05 | 1964-11-15 | Mueller Jakob | Photoelectric weft thread monitor for ribbon looms |
| CH420003A (en) * | 1962-01-19 | 1966-08-31 | Siemens Ag | Photoelectric monitoring device for bobbins, in particular for looms |
| CH421857A (en) * | 1962-01-19 | 1966-09-30 | Siemens Ag | Monitoring device for bobbins, in particular for looms |
| US3553467A (en) * | 1968-10-23 | 1971-01-05 | Gen Motors Corp | Rotatable shutter means having light-blocking portion when stationary |
-
1977
- 1977-04-08 AT AT250577A patent/AT352647B/en not_active IP Right Cessation
-
1978
- 1978-04-03 DE DE2814280A patent/DE2814280C2/en not_active Expired
- 1978-04-04 CH CH358578A patent/CH627800A5/en not_active IP Right Cessation
- 1978-04-06 GB GB13541/78A patent/GB1581119A/en not_active Expired
- 1978-04-06 IT IT48771/78A patent/IT1102454B/en active
- 1978-04-07 PT PT67880A patent/PT67880B/en unknown
- 1978-04-07 ES ES468636A patent/ES468636A1/en not_active Expired
- 1978-04-07 FR FR7810411A patent/FR2386629A1/en active Granted
- 1978-04-08 JP JP4168578A patent/JPS53126360A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ATA250577A (en) | 1979-02-15 |
| JPS6119743B2 (en) | 1986-05-19 |
| PT67880A (en) | 1978-05-01 |
| CH627800A5 (en) | 1982-01-29 |
| DE2814280A1 (en) | 1978-10-12 |
| DE2814280C2 (en) | 1987-04-30 |
| FR2386629A1 (en) | 1978-11-03 |
| FR2386629B3 (en) | 1980-11-07 |
| AT352647B (en) | 1979-09-25 |
| JPS53126360A (en) | 1978-11-04 |
| IT7848771A0 (en) | 1978-04-06 |
| ES468636A1 (en) | 1978-12-01 |
| IT1102454B (en) | 1985-10-07 |
| PT67880B (en) | 1979-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |