CA1075095A - Method and an apparatus to detect prolonged excessive tension in yarn material - Google Patents
Method and an apparatus to detect prolonged excessive tension in yarn materialInfo
- Publication number
- CA1075095A CA1075095A CA180,815A CA180815A CA1075095A CA 1075095 A CA1075095 A CA 1075095A CA 180815 A CA180815 A CA 180815A CA 1075095 A CA1075095 A CA 1075095A
- Authority
- CA
- Canada
- Prior art keywords
- yarn
- arm
- excessive tension
- tension
- prolonged
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/047—Specific indicating or recording arrangements, e.g. for remote indication, for indicating overload or underload
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- 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
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
- D06H1/00—Marking textile materials; Marking in combination with metering or inspecting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2555/00—Actuating means
- B65H2555/10—Actuating means linear
- B65H2555/13—Actuating means linear magnetic, e.g. induction motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2601/00—Problem to be solved or advantage achieved
- B65H2601/50—Diminishing, minimizing or reducing
- B65H2601/52—Diminishing, minimizing or reducing entities relating to handling machine
- B65H2601/524—Vibration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
ABSTRACT
A process for measuring yarn uniformity, said process comprising sensing the over-tension of a yarn and indicating said over-tension. An apparatus for said process and particularly one that discriminates from apparent upper tension is also contemplated. The apparatus comprises a yarn sensing arm rotatably mounted and a magnetic means to hold the arm in an upward position. The magnetic force created by said magnetic means on said arm is adjustable end the arm is displace-able from the magnetic field upon a tension greater than a predetermined tension to release the arm from the upward position in case of over-tension. The apparatus is preferably provided with a dampening means (or instance as elastic member) which discriminates from surrounding vibrations.
A process for measuring yarn uniformity, said process comprising sensing the over-tension of a yarn and indicating said over-tension. An apparatus for said process and particularly one that discriminates from apparent upper tension is also contemplated. The apparatus comprises a yarn sensing arm rotatably mounted and a magnetic means to hold the arm in an upward position. The magnetic force created by said magnetic means on said arm is adjustable end the arm is displace-able from the magnetic field upon a tension greater than a predetermined tension to release the arm from the upward position in case of over-tension. The apparatus is preferably provided with a dampening means (or instance as elastic member) which discriminates from surrounding vibrations.
Description
iO750~5 This invention relates to a method and to an apparatus for detecting the prolonged excessive tension in yarn material and more par-ticularly for discriminating over apparent excessive tension in yarn material.
Throughout the disclosure and claims the terms yarn or yarn materials include filament-like products, rovings and other fibrous strands and bundles thereof, twines, strings, strands and the like.
The Prior Art For certain fibre products, extruded under relatively low tensions, variations in tension induce changes in the yarn susceptible - of causing warp streaks. However, these defects are sometimes not apparent during extrusion, warping and weaving and only show during the fabric or carpet finishing operations when the product is wetted or heated. This can result in thousand of yards of finished product being downgraded because of a single end streak; for instance,acetate yarns extruded under a variation in tension of the order 1 X 1o-l gram per denier may often be processed normally into a warp and fabric, but during the finishing operation, the thread made under higher tension shrinks more than the adjacent threads, producing a tight end which reflects light at a different angle from the warp and causes a streak.
Apparatus for sensing tension in yarn material exist, but -they are relatively expensive and are either too sensitive or not enough.
A problem encountered with the presently existing sensing apparatus is their difficulty to be insensitive to vibrations caused by the spinning process or other vibrations which cause a transient increase in the tension on the yarn material.
The Invention Broadly stated, the applicant has now invented a new method to detect prolonged excessive tension generally resulting in yarn non-uniformity.
This method comprises:
':
a) Continuously pulling a yarn from a yarn source to a take-up device, b) providing deflecting means deflectable by said yarn, said deflecting means being biased so as to resist transient deflecting forces and to be substantially deflected only in response to prolonged deflecting - forces due to said prolonged excessive tension in said yarn, and, while pulling said yarn, thereby continu-ously distinguishing, by the deflection of said deflect-ing means, any prolonged excessive tension produced by the pulling on said yarn from any transient excessive tension, and c) providing means to indicate the occurrence of any ` prolonged excessive tension.
Preferably, the method further includes identifying the portion of said yarn under prolonged excessive tension by colouring it.
- In another embodiment, the method further includes identi-fying the portion of said yarn under prolonged excessive tension, by outting it.
Broadly stated, the invention is also directed to an appara-tus to sense prolonged excessive tension in a yarn upon continuously pulling the yarn from a yarn supply to a take-up device, said prolonged excessive tension generally resulting in a yarn non-uniformity.
Said yarn tension apparatus comprises:
a) a yarn sensing arm including a magnetic portion, and a yarn guide at one end, b) a pivot means pivotally mounting said arm for pivotal movement.
c) permanent-magnet means mounted adjacent to said magnetic arm portion constructed and arranged to operatively bias the yarn sensing arm and to magnetically hold said arm .
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~075095 against gravity and in a normal position, such that upon occurrence of prolonged excessive tension on said yarn guide when the moment about the pivot of the force applied by a yarn plus the moment due to gravity exceed the biasing moment due to the magnet, the arm will move, gravity-assisted, to a position indicative of the occurrence of said prolonged excessive tension in said yarn.
In a preferred embodiment, the apparatus further includes a flexible support resiliently carrying said permanent magnet means in con-tact with said arm, and operatively absorbing and dampening prolonged transient excessive tensions in said yarn and vibrations acting thereon through said arm.
The apparatus may be provided with marking means, for instance, a pad coming into contact with the yarn when over-tensioned or it may form a switch to cooperate with electrical circuits, as will be seen later.
Also, the apparatus may be used in various combinations such as between yarn feeding rolls and a twisting apparatus, or in cooperation with an ~ ;
air jet, in yarn building, for example. Other uses (when yarn tension is critical) are also contemplated. -In the drawings which illustrate embodiments of the invention:
Figure 1 is a side view of an apparatus for sensing pro-longed excessive tension in yarn and schematically associated with a yarn feeding roll and a twisting apparatus, and shown in enlarged scale relative to the associated elements.
Figure 2, is a top view of the yarn prolonged excessive tension sensing apparatus taken along line 2-2 of Figure 1 .
Figure 3 is a cross-section taken along the line 3-3 --of Figure 2.
` ~07509S
Figure 4 is a cross-section view of a yarn sensing arm fonning part of the sensing apparatus of Figures 1, 2 and 3 .
Figure 5 is a view taken along line 5-5 of Figure 3.
` Figure 6 is a bottom view of a yarn excessive-tension sensing apparatus according to another embodiment of the invention and wherein an electrical output signal is produced.
Figure 7 is a cross-sectional view of a portion of a yarn excessive-tension sensing apparatus according to another embo-diment of the invention wherein a marking device is provided.
Figure 8 is a view taken along line 8-8 of Figure 7 .
Figure 9 is a side view of a yarn excessive-tension sensing apparatus according to another embodiment of the invention wherein the apparatus detecting excessive-tension is used in cooper-ation with an air jet.
Referring now to Figure 1, Number 10 designates a yarn source (for instance yarn products originating from a spinnerette ) supplying yarns 12 being drawn by a driven feed roll 14 intended to be spun by a twisting apparatus having a rotating bobbin 16, a ring traveller 18 and reciprocating ring 20 .
Letween said feed roll 14 and the twisting apparatus, an apparatus for sensing excessive tension in a yarn according to the embodiment of Figures 1, 2 and 3, comprises a frame 30, a yarn sensing arm 32 which is ferro-magnetic, although a portion only may be magnetic if desired. This sensing arm 32 is provided with a "~eanium"* yarn guide 34 cemented at the outer end thereof, for instance with "HYSOL ADHESIVE", a trade mark for an adhesive .
The inner end portion of the yarn sensing arm 32 is secured at 35 to one side of z hinge 40 . The other side of the hinge 40 is slidably adjustable under frame 30 by a pair of nuts 41 engaged on bolts 43,44 respectively passing through elongated slots 30c and 30d . These slots allow slidahle adjustment of the yarn sensing arm J^ A trade mark for a yarn guide .
~`
`-~
.
:~075095 relative to the yarn as well as proper fine adjustment of the bias on said arm .
Preferably, the frame 30 defines side walls which enable through openings 46a the insertion of a rod 48 for confining the pivotal displacement of the yarn sensing arm 32 to a short path 35a instead of 33, as shown Otl Figure l. A magnet 50 is secured by screw Sl on to a supporting arm 52 . The supporting arm 52 is slidable over the top of the frame 30 and is adjustably locked in position by bolts 54, 56 and nuts. Preferably, the supporting arm 52 is flexible in order to isol~te the magnet and thus discriminate between the surrounding vibrations caused for instance by vibrations of the twisting apparatus and other vibrations and in order that the device better discriminates the excessive tension produced by the pulling from the transient excessive tension through absorption and dampening of the latter. The resilient supporting arm 52 acting as damper means.
The bias in the arm is preset by sliding the supporting arm 52 away from hinge 40 to increase the bias on the yarn sensing arm, and closer to said hinge to decrease the bias on the arm . --Also for proper alignment of the yarn, the bolts 43, 44 are -unscrewed and the hinge may be allowed to slide to the desired --position, the bolts being displaceable along the slots 30c and 30d When frame 30 i9 in close proximity to a movable portion, like for instance the bobbin 16, to have easy access to such bobbins, the frame 30 is made rotatable or turnable by means of a pivot 60 which can also receive a bracket 62, such bracket being adaptable to a main frame of the apparatus with which the yarn sensing device cooperates. For instance, the bracket 62 may define a threaded bore 62a for receiving a bolt which enables mounting on ~., .
;` -' i075095 .
such main frame. The bracket 62 may also define a stopping portion 62b . Also the frame 30 may be provided with auxiliary guides for the filamentary products such as the L-shaped eler.lent 72 better shown on Figures 1 and 3 .
The L-shaped element 72 may also be provided with a slit defined with "Heanium" portions 73, 74 properly cemented and acting as slub catcher, as shown on Figure 5. At its base the L-shaped element 72 has an elongated slot to enable suitable adjustment or alignment by a screw 76 .
OPERATION
When the yarn 12 is moved from feed roll 14 to the bobbin 16 and the ring traveller 18 exerts excessive tension on the yarn 12, the yarn sensing arm 32 moves down.
Much of the momentary or transient vibrations caused on I the yarn sensing arm by the rotating bobbin 16 or ring traveller are transmitted to the flexible supporting a~m 52 which prevents an undesired drop down of the yarn sensing arm.
A yarn excessive tension sensing apparatus as described in Figures 1 to 5 was used in cooperation with a spinning apparatu~
which was pulling on the yarn such that the latter was exerting on the guide 34 a force of 9 grams, which constitutes a remarkable improvement.
In the embodiment shown in Figure 6, the rod 48 is electrically isolated from the remaining portion of the yarn sensing device by a pair of non-conducting rings 49 . Said rod 48 and said yarn sensing arm are each provided with an electrically conductive wire 77, 78 whereby an electrical current is able to circulate when the yarn sensino ar.n move, do-~l to contact ~he rod acting as a switch. The switch generally conducts a minimim of F
~; low-voltage current, and is generally used with a by-pass, as is well known in the electric current when the yarn sensing arm is in the upward position as is known in the art.
The yarn excessive tension sensing apparatus shown in Figures 7 and 8 is provided with a colouring wick, which absorbs the colouring dye contained inside a tube-shaped reservoir 79, so that when the yarn sensing arm drops down, the colouring wick dyes the portion of the yarn running under excessive tension to identify it.
The yarn excessive tension sensing apparatus, shown in Figures 7 and 8, may be provided with a sandpaper wrapped around the reservoir 79, used as supporting means, (the wick being removed) so that when the yarn sensing arm drops down, the sandpaper cuts the yarn running under excessive tension to identify it.
In the embodiment of Figure 9, number 80 designates a yarn bulking air jet device through which the yarn 82 moves from ~ ~
inlet 84 to outlet 86. Near said outlet 86 a yarn sensing arm 88 -is pivotally mounted by means of a hinge 90 which itself is secured to the housing 80 of the yarn bulking air jet device 80 by screw 92 . -The arm is biased in an upper position by means of a magnet 94 which is also secured to the housing 80 of the yarn bulking air jet device 80 by a screw 96 inwardly recessed in said magnet.
For proper alignment, the yarn sensing arm 88 is bent at 98 and is --; provided with a "Heanium" guide 100 cemented at its outer end .
The yarn sensing arm 88 is also provided with a stopper 104 . Near the inlet and (similar to the one shown on Figure 5) another yarn guide 102 may be located to properly align the yarn. The stopper 104 is provided to limit the lowering movement of the yarn sensing arm 88 . The biasing exerted by the magnet on the yarn sensing arm is set so that when a predetermined excessive tension is exerted on the yarn 82 and thereby transmits a corresponding force on said yarn sensing arm 88 to 100, the arm 88 pivotally moves down , as ~.~
, ~75~95 shown at 88B. If desired, the stopper and the yarn .sensing arm have electrically conductive portions such that when in contact ~ith each other they produce an output signal to indicate that an excessive tension is exerted on the yarn 82. In such cases, they are electrically isolated from each other in normal elevated position .
Also as in another previous embodiment, a coloured wick inside a tube 106 or sandpaper is provided around the latter in the latter case to break the yarn upon dropping of the yarn sensing arm to the downward position.
Although reference has been made to very specified and limited applications for sake of clarity and brevity, it can be easily seen that this apparatus for detecting excessive tension may have a plurality of other applications, which are also contemp-lated by the applicant in this application.
This apparatus can also indicate excessive tension either visually itself, on the yarn product, or by a plurality of other means.
.
, ~'
Throughout the disclosure and claims the terms yarn or yarn materials include filament-like products, rovings and other fibrous strands and bundles thereof, twines, strings, strands and the like.
The Prior Art For certain fibre products, extruded under relatively low tensions, variations in tension induce changes in the yarn susceptible - of causing warp streaks. However, these defects are sometimes not apparent during extrusion, warping and weaving and only show during the fabric or carpet finishing operations when the product is wetted or heated. This can result in thousand of yards of finished product being downgraded because of a single end streak; for instance,acetate yarns extruded under a variation in tension of the order 1 X 1o-l gram per denier may often be processed normally into a warp and fabric, but during the finishing operation, the thread made under higher tension shrinks more than the adjacent threads, producing a tight end which reflects light at a different angle from the warp and causes a streak.
Apparatus for sensing tension in yarn material exist, but -they are relatively expensive and are either too sensitive or not enough.
A problem encountered with the presently existing sensing apparatus is their difficulty to be insensitive to vibrations caused by the spinning process or other vibrations which cause a transient increase in the tension on the yarn material.
The Invention Broadly stated, the applicant has now invented a new method to detect prolonged excessive tension generally resulting in yarn non-uniformity.
This method comprises:
':
a) Continuously pulling a yarn from a yarn source to a take-up device, b) providing deflecting means deflectable by said yarn, said deflecting means being biased so as to resist transient deflecting forces and to be substantially deflected only in response to prolonged deflecting - forces due to said prolonged excessive tension in said yarn, and, while pulling said yarn, thereby continu-ously distinguishing, by the deflection of said deflect-ing means, any prolonged excessive tension produced by the pulling on said yarn from any transient excessive tension, and c) providing means to indicate the occurrence of any ` prolonged excessive tension.
Preferably, the method further includes identifying the portion of said yarn under prolonged excessive tension by colouring it.
- In another embodiment, the method further includes identi-fying the portion of said yarn under prolonged excessive tension, by outting it.
Broadly stated, the invention is also directed to an appara-tus to sense prolonged excessive tension in a yarn upon continuously pulling the yarn from a yarn supply to a take-up device, said prolonged excessive tension generally resulting in a yarn non-uniformity.
Said yarn tension apparatus comprises:
a) a yarn sensing arm including a magnetic portion, and a yarn guide at one end, b) a pivot means pivotally mounting said arm for pivotal movement.
c) permanent-magnet means mounted adjacent to said magnetic arm portion constructed and arranged to operatively bias the yarn sensing arm and to magnetically hold said arm .
- `
`
~075095 against gravity and in a normal position, such that upon occurrence of prolonged excessive tension on said yarn guide when the moment about the pivot of the force applied by a yarn plus the moment due to gravity exceed the biasing moment due to the magnet, the arm will move, gravity-assisted, to a position indicative of the occurrence of said prolonged excessive tension in said yarn.
In a preferred embodiment, the apparatus further includes a flexible support resiliently carrying said permanent magnet means in con-tact with said arm, and operatively absorbing and dampening prolonged transient excessive tensions in said yarn and vibrations acting thereon through said arm.
The apparatus may be provided with marking means, for instance, a pad coming into contact with the yarn when over-tensioned or it may form a switch to cooperate with electrical circuits, as will be seen later.
Also, the apparatus may be used in various combinations such as between yarn feeding rolls and a twisting apparatus, or in cooperation with an ~ ;
air jet, in yarn building, for example. Other uses (when yarn tension is critical) are also contemplated. -In the drawings which illustrate embodiments of the invention:
Figure 1 is a side view of an apparatus for sensing pro-longed excessive tension in yarn and schematically associated with a yarn feeding roll and a twisting apparatus, and shown in enlarged scale relative to the associated elements.
Figure 2, is a top view of the yarn prolonged excessive tension sensing apparatus taken along line 2-2 of Figure 1 .
Figure 3 is a cross-section taken along the line 3-3 --of Figure 2.
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Figure 4 is a cross-section view of a yarn sensing arm fonning part of the sensing apparatus of Figures 1, 2 and 3 .
Figure 5 is a view taken along line 5-5 of Figure 3.
` Figure 6 is a bottom view of a yarn excessive-tension sensing apparatus according to another embodiment of the invention and wherein an electrical output signal is produced.
Figure 7 is a cross-sectional view of a portion of a yarn excessive-tension sensing apparatus according to another embo-diment of the invention wherein a marking device is provided.
Figure 8 is a view taken along line 8-8 of Figure 7 .
Figure 9 is a side view of a yarn excessive-tension sensing apparatus according to another embodiment of the invention wherein the apparatus detecting excessive-tension is used in cooper-ation with an air jet.
Referring now to Figure 1, Number 10 designates a yarn source (for instance yarn products originating from a spinnerette ) supplying yarns 12 being drawn by a driven feed roll 14 intended to be spun by a twisting apparatus having a rotating bobbin 16, a ring traveller 18 and reciprocating ring 20 .
Letween said feed roll 14 and the twisting apparatus, an apparatus for sensing excessive tension in a yarn according to the embodiment of Figures 1, 2 and 3, comprises a frame 30, a yarn sensing arm 32 which is ferro-magnetic, although a portion only may be magnetic if desired. This sensing arm 32 is provided with a "~eanium"* yarn guide 34 cemented at the outer end thereof, for instance with "HYSOL ADHESIVE", a trade mark for an adhesive .
The inner end portion of the yarn sensing arm 32 is secured at 35 to one side of z hinge 40 . The other side of the hinge 40 is slidably adjustable under frame 30 by a pair of nuts 41 engaged on bolts 43,44 respectively passing through elongated slots 30c and 30d . These slots allow slidahle adjustment of the yarn sensing arm J^ A trade mark for a yarn guide .
~`
`-~
.
:~075095 relative to the yarn as well as proper fine adjustment of the bias on said arm .
Preferably, the frame 30 defines side walls which enable through openings 46a the insertion of a rod 48 for confining the pivotal displacement of the yarn sensing arm 32 to a short path 35a instead of 33, as shown Otl Figure l. A magnet 50 is secured by screw Sl on to a supporting arm 52 . The supporting arm 52 is slidable over the top of the frame 30 and is adjustably locked in position by bolts 54, 56 and nuts. Preferably, the supporting arm 52 is flexible in order to isol~te the magnet and thus discriminate between the surrounding vibrations caused for instance by vibrations of the twisting apparatus and other vibrations and in order that the device better discriminates the excessive tension produced by the pulling from the transient excessive tension through absorption and dampening of the latter. The resilient supporting arm 52 acting as damper means.
The bias in the arm is preset by sliding the supporting arm 52 away from hinge 40 to increase the bias on the yarn sensing arm, and closer to said hinge to decrease the bias on the arm . --Also for proper alignment of the yarn, the bolts 43, 44 are -unscrewed and the hinge may be allowed to slide to the desired --position, the bolts being displaceable along the slots 30c and 30d When frame 30 i9 in close proximity to a movable portion, like for instance the bobbin 16, to have easy access to such bobbins, the frame 30 is made rotatable or turnable by means of a pivot 60 which can also receive a bracket 62, such bracket being adaptable to a main frame of the apparatus with which the yarn sensing device cooperates. For instance, the bracket 62 may define a threaded bore 62a for receiving a bolt which enables mounting on ~., .
;` -' i075095 .
such main frame. The bracket 62 may also define a stopping portion 62b . Also the frame 30 may be provided with auxiliary guides for the filamentary products such as the L-shaped eler.lent 72 better shown on Figures 1 and 3 .
The L-shaped element 72 may also be provided with a slit defined with "Heanium" portions 73, 74 properly cemented and acting as slub catcher, as shown on Figure 5. At its base the L-shaped element 72 has an elongated slot to enable suitable adjustment or alignment by a screw 76 .
OPERATION
When the yarn 12 is moved from feed roll 14 to the bobbin 16 and the ring traveller 18 exerts excessive tension on the yarn 12, the yarn sensing arm 32 moves down.
Much of the momentary or transient vibrations caused on I the yarn sensing arm by the rotating bobbin 16 or ring traveller are transmitted to the flexible supporting a~m 52 which prevents an undesired drop down of the yarn sensing arm.
A yarn excessive tension sensing apparatus as described in Figures 1 to 5 was used in cooperation with a spinning apparatu~
which was pulling on the yarn such that the latter was exerting on the guide 34 a force of 9 grams, which constitutes a remarkable improvement.
In the embodiment shown in Figure 6, the rod 48 is electrically isolated from the remaining portion of the yarn sensing device by a pair of non-conducting rings 49 . Said rod 48 and said yarn sensing arm are each provided with an electrically conductive wire 77, 78 whereby an electrical current is able to circulate when the yarn sensino ar.n move, do-~l to contact ~he rod acting as a switch. The switch generally conducts a minimim of F
~; low-voltage current, and is generally used with a by-pass, as is well known in the electric current when the yarn sensing arm is in the upward position as is known in the art.
The yarn excessive tension sensing apparatus shown in Figures 7 and 8 is provided with a colouring wick, which absorbs the colouring dye contained inside a tube-shaped reservoir 79, so that when the yarn sensing arm drops down, the colouring wick dyes the portion of the yarn running under excessive tension to identify it.
The yarn excessive tension sensing apparatus, shown in Figures 7 and 8, may be provided with a sandpaper wrapped around the reservoir 79, used as supporting means, (the wick being removed) so that when the yarn sensing arm drops down, the sandpaper cuts the yarn running under excessive tension to identify it.
In the embodiment of Figure 9, number 80 designates a yarn bulking air jet device through which the yarn 82 moves from ~ ~
inlet 84 to outlet 86. Near said outlet 86 a yarn sensing arm 88 -is pivotally mounted by means of a hinge 90 which itself is secured to the housing 80 of the yarn bulking air jet device 80 by screw 92 . -The arm is biased in an upper position by means of a magnet 94 which is also secured to the housing 80 of the yarn bulking air jet device 80 by a screw 96 inwardly recessed in said magnet.
For proper alignment, the yarn sensing arm 88 is bent at 98 and is --; provided with a "Heanium" guide 100 cemented at its outer end .
The yarn sensing arm 88 is also provided with a stopper 104 . Near the inlet and (similar to the one shown on Figure 5) another yarn guide 102 may be located to properly align the yarn. The stopper 104 is provided to limit the lowering movement of the yarn sensing arm 88 . The biasing exerted by the magnet on the yarn sensing arm is set so that when a predetermined excessive tension is exerted on the yarn 82 and thereby transmits a corresponding force on said yarn sensing arm 88 to 100, the arm 88 pivotally moves down , as ~.~
, ~75~95 shown at 88B. If desired, the stopper and the yarn .sensing arm have electrically conductive portions such that when in contact ~ith each other they produce an output signal to indicate that an excessive tension is exerted on the yarn 82. In such cases, they are electrically isolated from each other in normal elevated position .
Also as in another previous embodiment, a coloured wick inside a tube 106 or sandpaper is provided around the latter in the latter case to break the yarn upon dropping of the yarn sensing arm to the downward position.
Although reference has been made to very specified and limited applications for sake of clarity and brevity, it can be easily seen that this apparatus for detecting excessive tension may have a plurality of other applications, which are also contemp-lated by the applicant in this application.
This apparatus can also indicate excessive tension either visually itself, on the yarn product, or by a plurality of other means.
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Claims (8)
1. A method to detect prolonged excessive tension in a yarn, said prolonged excessive tension generally resulting in yarn non-uniformity, said method comprising:
a) Continuously pulling a yarn from a yarn source to a take-up device, b) providing deflecting means deflectable by said yarn, said deflecting means being biased so as to resist transient deflecting forces and to be substantially deflected only in response to prolonged deflecting forces due to said prolonged excessive tension in said yarn, and, while pulling said yarn, thereby continuously distinguishing, by the deflection of said deflecting means, any prolonged excessive tension produced by the pulling on said yarn from any transient excessive tension, and c) providing means to indicate the occurence of any prolonged excessive tension.
a) Continuously pulling a yarn from a yarn source to a take-up device, b) providing deflecting means deflectable by said yarn, said deflecting means being biased so as to resist transient deflecting forces and to be substantially deflected only in response to prolonged deflecting forces due to said prolonged excessive tension in said yarn, and, while pulling said yarn, thereby continuously distinguishing, by the deflection of said deflecting means, any prolonged excessive tension produced by the pulling on said yarn from any transient excessive tension, and c) providing means to indicate the occurence of any prolonged excessive tension.
2. The method as defined in Claim 1, which further includes identifying the portion of said yarn under prolonged excessive tension, by colouring it.
3. The method as defined in Claim 1, which further includes identifying the portion of said yarn under prolonged excessive tension, by cutting it.
4. An apparatus to sense prolonged excessive tension in a yarn upon continuously pulling the yarn from the yarn supply to a take-up device, said prolonged excessive tension generally resulting in a yarn non-uniformity, said yarn tension sensing apparatus comprising:
a) a yarn sensing arm including a magnetic portion, and a yarn guide at one end, b) pivot means pivotally mounting said arm for pivotal movement, c) permanent-magnet means mounted adjacent to said magnetic arm portion constructed and arranged to operatively bias the yarn sensing arm and to magnetically hold said arm against gravity and in a normal operative position, such that upon occurrence of prolonged excessive tension on said yarn guide when the moment about the pivot of the force applied by a yarn plus the moment due to gravity exceed the biasing moment due to the magnet, the arm will move, gravity-assisted, to a position indicative of the occurrence of said prolonged excessive tension in said yarn.
a) a yarn sensing arm including a magnetic portion, and a yarn guide at one end, b) pivot means pivotally mounting said arm for pivotal movement, c) permanent-magnet means mounted adjacent to said magnetic arm portion constructed and arranged to operatively bias the yarn sensing arm and to magnetically hold said arm against gravity and in a normal operative position, such that upon occurrence of prolonged excessive tension on said yarn guide when the moment about the pivot of the force applied by a yarn plus the moment due to gravity exceed the biasing moment due to the magnet, the arm will move, gravity-assisted, to a position indicative of the occurrence of said prolonged excessive tension in said yarn.
5. A yarn tension sensing apparatus as defined in Claim 4, further including a flexible support resiliently carrying said perma-nent magnet means in contact with said arm, and operatively absorbing and dampening transient excessive tension in said yarn and vibrations acting thereon through said arm.
6. A yarn tension sensing apparatus as defined in Claim 5, wherein said flexible support is adjustably secured and adjustable to and fro relative to said pivot means, for adjustment of the magnetic attraction force by said permanent magnet means on said arm.
7. An apparatus to sense prolonged excessive tension in a yarn upon continuously pulling the yarn from a yarn supply to a take-up device, said prolonged excessive tension generally resulting in yarn non-uniformity, said yarn tension sensing apparatus comprising:
a) a frame, b) a yarn sensing arm having one end pivotally mounted about an horizontal axis secured to said frame, said arm having a yarn guide at the other end and a magnetic portion between said two ends c) a permanet magnet, d) a flexible support above said arm for said magnet, said flexible support being slidably mounted on said frame and adjustably secured to and fro relative to said horizontal axis, for adjustment of the arm of the magnetic force so that said magnet cooperates with said magnetic portion to bias and to magnetically hold said other end with said yarn guide toward an elevated operative position under the strength of a magnetic attraction force, whereby upon pulling a yarn with a prolonged excessive tension relative to a predetermined normal pulling tension, said yarn pushes on said yarn guide and said arm, and thereby said flexible support momentarily moving in the pulling direction of said yarn guide by said yarn, oper-atively absorbing and dampening the transient excessive tensions in said yarn and vibrations acting thereon, but such that upon prolonged excessive tension relative to the pre-determined normal pulling tensions, when the moment about the pivot of the force applied by the yarn plus the moment due to gravity exceed the bending moment due to said flexible support and the biasing moment due to the magnet, the arm falls gravity-assisted, to a downward position in the same direction as gravity, indicative of the occurrence of a prolonged excessive tension in the yarn, and in said pulling direction with said arm thus responding to said prolonged excessive tension to indicate that the yarn at said point is non-uniform as result of said prolonged excessive tension in the yarn.
a) a frame, b) a yarn sensing arm having one end pivotally mounted about an horizontal axis secured to said frame, said arm having a yarn guide at the other end and a magnetic portion between said two ends c) a permanet magnet, d) a flexible support above said arm for said magnet, said flexible support being slidably mounted on said frame and adjustably secured to and fro relative to said horizontal axis, for adjustment of the arm of the magnetic force so that said magnet cooperates with said magnetic portion to bias and to magnetically hold said other end with said yarn guide toward an elevated operative position under the strength of a magnetic attraction force, whereby upon pulling a yarn with a prolonged excessive tension relative to a predetermined normal pulling tension, said yarn pushes on said yarn guide and said arm, and thereby said flexible support momentarily moving in the pulling direction of said yarn guide by said yarn, oper-atively absorbing and dampening the transient excessive tensions in said yarn and vibrations acting thereon, but such that upon prolonged excessive tension relative to the pre-determined normal pulling tensions, when the moment about the pivot of the force applied by the yarn plus the moment due to gravity exceed the bending moment due to said flexible support and the biasing moment due to the magnet, the arm falls gravity-assisted, to a downward position in the same direction as gravity, indicative of the occurrence of a prolonged excessive tension in the yarn, and in said pulling direction with said arm thus responding to said prolonged excessive tension to indicate that the yarn at said point is non-uniform as result of said prolonged excessive tension in the yarn.
8. A yarn tension sensing apparatus as defined in Claims 5 or 7, wherein said arm is adjustable endwise relative to the yarn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA180,815A CA1075095A (en) | 1973-09-11 | 1973-09-11 | Method and an apparatus to detect prolonged excessive tension in yarn material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA180,815A CA1075095A (en) | 1973-09-11 | 1973-09-11 | Method and an apparatus to detect prolonged excessive tension in yarn material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075095A true CA1075095A (en) | 1980-04-08 |
Family
ID=4097787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA180,815A Expired CA1075095A (en) | 1973-09-11 | 1973-09-11 | Method and an apparatus to detect prolonged excessive tension in yarn material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1075095A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4677860A (en) * | 1985-02-27 | 1987-07-07 | Barmag Ag | Yarn tension sensor |
| CN109030193A (en) * | 2018-07-30 | 2018-12-18 | 江苏凯威新材料科技有限公司 | A kind of cord strength on-line measuring device |
| CN113373580A (en) * | 2021-08-11 | 2021-09-10 | 南通海峰家居用品有限公司 | Online tension detection protector for textile yarns |
-
1973
- 1973-09-11 CA CA180,815A patent/CA1075095A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4677860A (en) * | 1985-02-27 | 1987-07-07 | Barmag Ag | Yarn tension sensor |
| CN109030193A (en) * | 2018-07-30 | 2018-12-18 | 江苏凯威新材料科技有限公司 | A kind of cord strength on-line measuring device |
| CN113373580A (en) * | 2021-08-11 | 2021-09-10 | 南通海峰家居用品有限公司 | Online tension detection protector for textile yarns |
| CN113373580B (en) * | 2021-08-11 | 2021-10-26 | 南通海峰家居用品有限公司 | Online tension detection protector for textile yarns |
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