EP3847300A1 - Sensor device and method for detecting an abnormal condition of a waste ribbon - Google Patents
Sensor device and method for detecting an abnormal condition of a waste ribbonInfo
- Publication number
- EP3847300A1 EP3847300A1 EP18768847.8A EP18768847A EP3847300A1 EP 3847300 A1 EP3847300 A1 EP 3847300A1 EP 18768847 A EP18768847 A EP 18768847A EP 3847300 A1 EP3847300 A1 EP 3847300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- block
- waste ribbon
- nominal position
- ribbon
- waste
- 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
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 93
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000009941 weaving Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 26
- 230000005484 gravity Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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
- D03D47/40—Forming selvedges
Definitions
- JP 56-103076-U shows a weaving machine with a sensor device for detecting a tension drop of a waste ribbon comprising a lever arranged swivellable about a swivel axis, wherein the lever is held in a first position at a distance from a contact by a waste ribbon against gravitational forces acting on the lever, and due to the gravitational forces, the lever is swivelled to a second position, in which the lever contacts the contact, in case a tension in the waste ribbon drops below a set value.
- a sensor device for detecting an abnormal condition of a waste ribbon in a weaving machine comprising a block with a guide element for the waste ribbon, wherein in a normal condition of the waste ribbon the block is arranged in a nominal position, and wherein the block is mounted slidably along a movement path of the waste ribbon, such that the block is slideable out of the nominal position in a direction opposite to the normal movement direction of the waste ribbon by forces acting on the block in said direction opposite to the normal movement direction of the waste ribbon.
- the waste ribbon contacts the block at the guide element.
- the waste ribbon exerts a force on the block in its movement direction.
- forces acting on the block in an opposite direction could be applied by a waste ribbon pulled backwards, i.e. pulled in a direction opposite to its normal movement direction, for example in case the waste ribbon is clamped between a fabric take-up device.
- the guide element for the waste ribbon in one embodiment is a guide groove. In other embodiments, the guide element is a guide eye.
- a proximity sensor is provided, wherein a presence or absence of the block in the nominal position is detectable by the proximity sensor.
- the block has a detection face, wherein the block is considered to be arranged in the nominal position as long as the detection face is arranged within a defined area opposite to the proximity sensor, i.e. as long as the detection face is detectable by the proximity sensor.
- the waste ribbon is moved along an at least essentially linear movement path, wherein the block is mounted slidably along a linear path.
- a guide shaft is provided, wherein the block is mounted to the guide shaft slidably along the guide shaft.
- a movement “along the guide shaft” describes a movement in the axial direction of the guide shaft.
- the block is provided with a groove or a through hole accommodating the guide shaft.
- the guide shaft is arranged at least essentially in parallel to the movement path of the waste ribbon.
- the guide shaft is mounted between wings of a mounting bracket, in particular between two wings of a mounting bracket, wherein each wing is provided with a guide element for the waste ribbon.
- the two guide elements define a movement path of the waste ribbon.
- the guide elements are aligned to each other along an axis extending parallel to the guide shaft.
- the guide elements for the waste ribbon in one embodiment each are formed by a guide groove, in other embodiments, the guide elements are guide eyes.
- the block is moveable over the full length of the guide shaft between the wings of the mounting bracket.
- a movement of the block in the normal movement direction of the waste ribbon towards a first wing of the mounting bracket is limited by an abutment element.
- the waste ribbon in use exerts a force on the block in its movement direction forcing the block against the abutment element.
- the abutment element ensures a precise and repeatable positioning of the block in the nominal position.
- the block has only one degree of freedom, i.e. a movement of the block is limited to the movement along the movement path of the waste ribbon.
- the block is further rotatably mounted to the guide shaft, wherein a force is applied to the block for rotating the block about the guide shaft out of the nominal position, and wherein the block is held in the nominal position against said force by a waste ribbon having a predefined tension.
- the block is slideable out of the nominal position as well as rotatable out of the nominal position, wherein either one of the movements out of the nominal position can be detected, for example by means of the proximity sensor.
- the guide shaft is horizontally arranged, wherein the gravitational forces are acting on the block for rotating the block about the guide shaft out of the nominal position.
- biasing force elements such as spring elements are provided for forcing the block out of the nominal position.
- the guide shaft in one embodiment is not horizontally arranged.
- the block is provided with a detection face, wherein the block is considered to be arranged in the nominal position as long as the detection face is arranged within a defined area.
- the block is at least slideable such that the detection face can be moved out of the defined area.
- the block is rotatable such that the detection face can be moved out of the defined area.
- the guide element for the waste ribbon of the block is a guide eye, wherein an axis of this guide eye and a rotation axis of the block lie in a middle plane of the block, wherein the detection face is arranged asymmetrically with respect to the middle plane.
- a method for detecting an abnormal condition of a waste ribbon in a weaving machine wherein the waste ribbon is guided by a block, which block is arranged slidably along a movement path of the waste ribbon, wherein in a normal condition of the waste ribbon the block is arranged in a nominal position, and wherein if the waste ribbon is moved in a direction opposite to its normal movement direction, the waste ribbon exerts a force on the block in said direction opposite to the normal movement direction of the waste ribbon and the block is moved in said direction opposite to the normal movement direction of the waste ribbon out of the nominal position.
- a presence or absence of the block in the nominal position is detected by a proximity sensor.
- the block is only moveable along a movement path of the waste ribbon.
- the block is arranged rotatably about a rotation axis extending at least essentially parallel to the movement path of the waste ribbon, wherein a force is applied to the block for rotating the block about the rotation axis out of the nominal position, and wherein the block is held in the nominal position against said force by a waste ribbon having a predefined tension.
- Fig. 1 is a perspective view from a front of a first embodiment of a sensor device for detecting an abnormal condition of a waste ribbon in a weaving machine, which preferably is arranged at a right side of a weaving machine,
- Fig. 2 shows the sensor device of Fig. 1 in a perspective view from behind in a normal condition of a waste ribbon
- Fig. 3 shows the sensor device of Fig. 2 in a perspective view from behind in an abnormal condition of a waste ribbon
- Fig. 4 is a front view of the sensor device of Fig. 1 in the normal condition of a waste ribbon of Fig. 2
- Fig. 5 is a front view of the sensor device of Fig. 1 in the abnormal condition of a waste ribbon of Fig. 3;
- Fig. 6 is a side view of the sensor device of Fig. 1 with a first sensitivity arrangement in the normal condition of the waste ribbon as shown in Fig. 3;
- Fig. 7 is a side view of the sensor device of Fig. 6 in another abnormal condition of a waste ribbon;
- Fig. 8 is a side view of the sensor device of Fig. 6 with a second sensitivity arrangement in the normal condition of the waste ribbon as shown in Fig. 3; and Fig. 9 is a perspective view from a front of a second embodiment of a sensor device for detecting an abnormal condition of a waste ribbon in a weaving machine, which preferably is arranged at a left side of a weaving machine.
- Figs. 1 to 8 show a first embodiment of a sensor device 1 for detecting an abnormal condition of a waste ribbon (not shown) in a weaving machine.
- the sensor device 1 comprises a block 2 with a guide element 3 for the waste ribbon.
- the block 2 is mounted to a guide shaft 4.
- the block 2 is slidably and rotatably mounted to the guide shaft 4 so that the block 2 can slide along the guide shaft 4 and rotate about the guide shaft 4.
- the sensor device 1 comprises a mounting bracket 5 with two parallel wings 6 and a cantilever 1 1 arranged perpendicular to the two wings 6.
- the guide shaft 4 is mounted between the wings 6 of the mounting bracket 5, wherein in the embodiment shown, the guide shaft 4 is mounted to the mounting bracket 5 by means of bolts 14, 15.
- Each wing 6 is provided with a guide element 7 for the waste ribbon.
- the guide shaft 4 is provided with an abutment element 8, wherein a movement of the block 2 towards a first wing 6 of the mounting bracket 5, which is shown on the right in Fig. 1 , is limited by the abutment element 8.
- the other wing 6 is referred to as second wing 6 in the following.
- the sensor device 1 further comprises a proximity sensor 9 with a cable 12, which is mounted to the cantilever 11 of the mounting bracket 5.
- the proximity sensor 9 cooperates with a detection face 10 of the block 2 as explained in more detail in the following.
- the guide element 3 of the block 2 and the guide elements 7 in the wings 6 are guide eyes, wherein a waste ribbon (not shown) is threaded through the guide element 7 provided at the second wing 6 (on the left in Fig. 1 ), through the guide element 3 of the block 2 and through the guide element 7 provided at the first wing 6.
- the waste ribbon is moved from the left to the right in Fig. 1 , wherein the moving waste ribbon exerts a force on the block 2 forcing the block 2 towards the abutment element 8.
- the expressions“left” and “right” used in the context of the application are only used for describing a position of elements with respect to one another and do not limit the arrangement of the sensor device 1 on a weaving machine.
- An axis 17 of the guide element 3 of the block 2 and a rotation axis 18 of the block 2 lie in a middle plane 13, indicated by a broken line.
- the block 2 shown in Figs. 1 to 8 is provided with three indications 16, wherein two indications 16 are provided at a common first part of the block 2 with respect to the middle plane, and one indication 16 is provided at an opposite second part of the block 2.
- the guide shaft 4 is horizontally arranged, wherein gravitational forces acting on the block 2 cause a rotation of the block 2 about the guide shaft 4 until an equilibrium is reached. In case a waste ribbon with a sufficient tension is threaded through the guide elements 3 and 7, a rotation of the block 2 is prevented. In case a tension of the waste ribbon drops, the block 2 will rotate about the guide shaft 4 due to the gravitational forces acting on the block 2.
- a center of gravity of the block 2 and the detection face 10 are arranged at opposite sides of the guide shaft 4, i.e. when the center of gravity is moved downwards, the detection face 10 is moved upwards. In other embodiments, the center of gravity of the block 2 and the detection face 10 are arranged at the same side of the block 2 with respect to the guide shaft 4.
- Figs. 1 , 2, 4, 6 and 6 and 8 show a normal condition of a waste ribbon, wherein the detection face 10 is arranged opposite to the proximity sensor 9.
- the block 2 is considered to be arranged in a nominal position as long as the detection face 10 is arranged within a defined area, and, thus detectable by the proximity sensor 9.
- the sensor device 1 shown in the figures is suitable for detecting two distinct abnormal conditions.
- Figs. 3 and 5 show a first abnormal condition, wherein the block 2 is moved along the guide shaft 4 out of the nominal position.
- a movement of the block 2 is caused by forces acting on the block 2 in a direction opposite to the normal movement direction of the waste ribbon, i.e. from the right to the left in Fig. 1.
- Such forces are applied to the block 2 for example if the waste ribbon is moved in a direction opposite to its normal movement direction, i.e. from the right to the left in Figs. 1 and 4.
- the detection face 10 of the block 2 will move away from the proximity sensor 9 and the proximity sensor 9 will give no signal.
- a travel path of the block 2 before the detection face 10 leaves the sensing range of the proximity sensor 9 depends among others on a dimension of the block 2 in the axial direction of the guide shaft 4 and a length of the abutment element 8.
- Fig. 7 shows a second abnormal condition, wherein the block 2 is rotated about the guide shaft 4 out of the nominal position shown in Fig. 6.
- Such a rotation of the block 2 is caused for example by gravitational forces acting on the block 2, in case a waste ribbon tension is not sufficient to balance the gravitational forces.
- the detection face 10 is arranged asymmetrically with respect to the middle plane 13.
- the block 2 can be mounted to the guide shaft 4 in two orientations as shown in Figs. 6 and 8, the orientations being rotated 180° with respect to each other. A sensitivity to deviations in the waste ribbon tension depends on the orientation of the block 2.
- Fig. 6 shows a first orientation, also referred to as sensitive arrangement, wherein the first part of the block 2 provided with two indications 16 is arranged above the second part of the block 2 provided with only one indication 16.
- the detection face 10 extends only over a small distance downwards from a neutral position, in which the middle plane 13 is aligned with a central axis of the proximity sensor 9.
- a small rotation of the block 2 about the guide shaft 4 causes the detection face 10 to move upwards and out of the range of the proximity sensor 9.
- a signal of the proximity sensor 9 already drops.
- Fig. 8 shows a second orientation, also referred to as non-sensitive arrangement, wherein the first part of the block 2 provided with two indications 16 is arranged below the second part of the block 2 provided with only one indication 16, wherein the indications 16 are not visible in Fig. 8.
- the detection face 10 extends over a larger distance downwards from a neutral position, in which the middle plane 13 is aligned with a central axis of the proximity sensor 9.
- the block 2 may rotate about the guide shaft 4 over a larger angle before a signal of the proximity sensor 9 will drop.
- the proximity sensor 9 continues to measures a signal even if the block 2 has been rotated about a larger angle compared to the sensitive arrangement.
- the sensor device 1 shown in Figs. 1 to 8 preferably is arranged at a right side of a weaving machine, wherein the waste ribbon moves in a normal condition from the left to the right.
- Fig. 9 is a perspective view from a front of a second embodiment of a sensor device 1 for detecting an abnormal condition of a waste ribbon in a weaving machine, which preferably is arranged at a left side of a weaving machine, wherein the waste ribbon moves in a normal condition from the right to the left.
- the sensor device 1 shown in Fig. 9 essentially corresponds to the sensor device 1 shown in Figs. 1 to 8 and for the same or similar elements coinciding reference signs are used.
- the abutment element 8 is provided on the second wing 6, shown on the left in Fig. 9.
- the waste ribbon (not show) is moved from the right to the left in the drawing plane forcing the block 2 against the abutment element 8.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2018/074174 WO2020048614A1 (en) | 2018-09-07 | 2018-09-07 | Sensor device and method for detecting an abnormal condition of a waste ribbon |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3847300A1 true EP3847300A1 (en) | 2021-07-14 |
EP3847300B1 EP3847300B1 (en) | 2022-12-07 |
Family
ID=63556322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18768847.8A Active EP3847300B1 (en) | 2018-09-07 | 2018-09-07 | Sensor device and method for detecting an abnormal condition of a waste ribbon |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3847300B1 (en) |
WO (1) | WO2020048614A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5245070U (en) * | 1975-09-18 | 1977-03-30 | ||
JPS56103076U (en) | 1980-01-08 | 1981-08-12 | ||
EP2570530B1 (en) * | 2011-09-14 | 2014-01-01 | Starlinger & Co Gesellschaft m.b.H. | Warp stop motion detector and circular loom |
-
2018
- 2018-09-07 WO PCT/EP2018/074174 patent/WO2020048614A1/en unknown
- 2018-09-07 EP EP18768847.8A patent/EP3847300B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3847300B1 (en) | 2022-12-07 |
WO2020048614A1 (en) | 2020-03-12 |
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