CA1044450A - Thread supply device for textile machines - Google Patents
Thread supply device for textile machinesInfo
- Publication number
- CA1044450A CA1044450A CA207,152A CA207152A CA1044450A CA 1044450 A CA1044450 A CA 1044450A CA 207152 A CA207152 A CA 207152A CA 1044450 A CA1044450 A CA 1044450A
- Authority
- CA
- Canada
- Prior art keywords
- thread
- withdrawal
- control element
- storage
- eye
- 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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
- D04B15/48—Thread-feeding devices
- D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
- Looms (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A thread supply device for textile machines, having a rotary thread drum to which thread is supplied from a storage bobbin. The thread is taken off the drum through a withdrawal eye assembly. According to the invention, the withdrawal eye assembly includes a switch-off eye which is spring-urged out of its co-axial arrangement with the drum and beneath same and is maintained in the co-axial arrange-ment by the tension of the thread passing therethrough.
When the tension of the thread is reduced, the spring-urged switch-off eye can no longer maintain it co-axial position, is displaced from same by its spring and the displacement of the eye is transformed by known means, e.g. a switch, into a control signal actuating and alarm device, stopping the textile machine or the like. The displaced position of the switch-off eye is specific in that the switch-off eye assumes a position whereby a line taken through the point at which the loose thread passes over the withdrawal rim, and the center of the withdrawal eye is substantially parallel with the axis of the drum.
A thread supply device for textile machines, having a rotary thread drum to which thread is supplied from a storage bobbin. The thread is taken off the drum through a withdrawal eye assembly. According to the invention, the withdrawal eye assembly includes a switch-off eye which is spring-urged out of its co-axial arrangement with the drum and beneath same and is maintained in the co-axial arrange-ment by the tension of the thread passing therethrough.
When the tension of the thread is reduced, the spring-urged switch-off eye can no longer maintain it co-axial position, is displaced from same by its spring and the displacement of the eye is transformed by known means, e.g. a switch, into a control signal actuating and alarm device, stopping the textile machine or the like. The displaced position of the switch-off eye is specific in that the switch-off eye assumes a position whereby a line taken through the point at which the loose thread passes over the withdrawal rim, and the center of the withdrawal eye is substantially parallel with the axis of the drum.
Description
1~4~4~0 ~ ~read $uppl~ Dey~ce for ~extile Machines This invention relates to a thread supply device for tex-tile mach~nesr ~n part~cular kn~tt~ng machines, compris;ng a thread drum which can be set in rotat~on and upon which t~ere is tangentially wound the thread issuing from a storage bobbin in order to form an intermed~ate supply and from which drum the :
thread may be unwound vertically~ oVer a ~ithdrawal rim of the drum and through a withdrawal eye assembly which is disposed coaxially to said drum and which comprises a cut-off eye which , . . .
may be pivoted transversely to the thread passage due to spxing action, and further comprising a thread control element which is arranged to be stationary in the area of the path of the -withdrawn thread adjacent the ~ithdrawal rim, but which is pref- -erably arranged to be movable out of the withdrawing path if so desired, and aga~nst which thread control element the thread laterally abuts due to the withdxa~l tension during positive thread supply.
A thread supply device of this type is described in an earlier application. The withdrawal eye assembly in that ap~
plication includes a pair of stat~onary withdrawal eyes in spaced relation on the imaginary drum axis between which the cut-off eye is located. If the withdrawal tension is decreased - -- :.
j for example due to the fact that too much thread is supplied ~'r to the textile machine, due to the presence of dirt in the thread guide at the point of thread consumption or due to the fact that a knot in the thread issuing from the thread drum becomes untangl~ed, the cut-off e~e ~a~ be pivoted laterally and forms bet~een the tWo stat~on~ar~ withdrawal eyes a thread loop whlch extend~ to the side. ~f the resultant movement of the cut-of~ eye is great enoughr the cut-off is activated. In thi~ assembly, the ~pring action acting on the cut-off eye must ', ~/~ ~ . '
thread may be unwound vertically~ oVer a ~ithdrawal rim of the drum and through a withdrawal eye assembly which is disposed coaxially to said drum and which comprises a cut-off eye which , . . .
may be pivoted transversely to the thread passage due to spxing action, and further comprising a thread control element which is arranged to be stationary in the area of the path of the -withdrawn thread adjacent the ~ithdrawal rim, but which is pref- -erably arranged to be movable out of the withdrawing path if so desired, and aga~nst which thread control element the thread laterally abuts due to the withdxa~l tension during positive thread supply.
A thread supply device of this type is described in an earlier application. The withdrawal eye assembly in that ap~
plication includes a pair of stat~onary withdrawal eyes in spaced relation on the imaginary drum axis between which the cut-off eye is located. If the withdrawal tension is decreased - -- :.
j for example due to the fact that too much thread is supplied ~'r to the textile machine, due to the presence of dirt in the thread guide at the point of thread consumption or due to the fact that a knot in the thread issuing from the thread drum becomes untangl~ed, the cut-off e~e ~a~ be pivoted laterally and forms bet~een the tWo stat~on~ar~ withdrawal eyes a thread loop whlch extend~ to the side. ~f the resultant movement of the cut-of~ eye is great enoughr the cut-off is activated. In thi~ assembly, the ~pring action acting on the cut-off eye must ', ~/~ ~ . '
- 2 ~
be relatively great so that the cut~off eye ~s capabl~ of lat-erally drawing the t~read unw~nding from t~e thread drum between the two withdrawal eyes in the form of a loop ~n the event that the withdrawal tension ~ reduced. This relatively great force of the spring, however, also acts on the thread during normal positive operation of the t~read sup~ly dev~ce so that the minimum tension in the thread being suppl~ed to the textile machine cannot be reduced as much as des~red.
The invention is based on the ob~ect of designing a thread supply device of the class described at the outset such that it is possible to indicate an undesirably great reduction in the withdrawal tension, but neverthel.ess car~y out positive thread supply with a very low w~thdra~al tension.
,:
This object is accomplished ~n accordance with the in~en- .
tion in that the cut-off eye.is the first eye of the withdrawal .-.
eye assembly traversed by the thread after it has passed the ~ withdrawal rim and that the spring load.urges the cut-off éye below the area of the withdrawal r~m relative to the imaginary thread drum axis, into which area the location is moved at which the thread leaves the withdrawal rim wh~le simultaneously leav-ing the thread control element during a reduction of the with-drawal tension.
The invention avails itself of the following phenomenon:
in a thread supply device of the recited class, the thread un-winding over the withdrawal r~m of the thread drum abuts later-. ally on the thread control element.during normal positive sup-ply operation. Thi8 abutment is due to the fact that the verti-cally withdrawn thread attempts to travel around the withdrawal rim due to the withdrawal tension,. but ~s prevented from doing :.
,, , . .
1~J4~5(~
be relatively great so that the cut~off eye ~s capabl~ of lat-erally drawing the t~read unw~nding from t~e thread drum between the two withdrawal eyes in the form of a loop ~n the event that the withdrawal tension ~ reduced. This relatively great force of the spring, however, also acts on the thread during normal positive operation of the t~read sup~ly dev~ce so that the minimum tension in the thread being suppl~ed to the textile machine cannot be reduced as much as des~red.
The invention is based on the ob~ect of designing a thread supply device of the class described at the outset such that it is possible to indicate an undesirably great reduction in the withdrawal tension, but neverthel.ess car~y out positive thread supply with a very low w~thdra~al tension.
,:
This object is accomplished ~n accordance with the in~en- .
tion in that the cut-off eye.is the first eye of the withdrawal .-.
eye assembly traversed by the thread after it has passed the ~ withdrawal rim and that the spring load.urges the cut-off éye below the area of the withdrawal r~m relative to the imaginary thread drum axis, into which area the location is moved at which the thread leaves the withdrawal rim wh~le simultaneously leav-ing the thread control element during a reduction of the with-drawal tension.
The invention avails itself of the following phenomenon:
in a thread supply device of the recited class, the thread un-winding over the withdrawal r~m of the thread drum abuts later-. ally on the thread control element.during normal positive sup-ply operation. Thi8 abutment is due to the fact that the verti-cally withdrawn thread attempts to travel around the withdrawal rim due to the withdrawal tension,. but ~s prevented from doing :.
,, , . .
1~J4~5(~
- 3 -so by the thread control element. Thus, only that amount of thread may ~ remoyed or w~thdrawn wh~ch ~s released by the rotation of the tnread drum. ~n this~ ~ay, the point at which the thread passes over the w~thdrawal r~m ~s normally fixed in space and is located ad~acent tne t~read control element. If the tension is decreased in the withdrawn threadr less thread is removed from the drum than is released due to its rotation.
The rotating thread drum pulls the un~inding thread along in the direction of rotation so that the point at which the thread leaves the withdrawal r~m travels in the d~rection of drum rotation away from the thread control element along a circular path determined by the circumference of the withdrawal rim.
Due to this movement, t~e thread unwind~ng from the drum attempts to pivot the cut-off eye, ~hich it reaches f~rst, ~ ~
in a lateral d~rection toward the locatton at which the displaced -point of withdrawal is located due to the residual tension ',."--"~7".
still present in t~e thread.~ Since the cut-off eye is urged -in the same dlrection due to the spring force acting there- -upon, the residual withdrawal tension in the thread and the spring force enhance one another. A very slight spring force is thus sufficient to indicate an inadmissible decrease in the withdrawal tension at the cut-off. The reduced spring force acting on the cut-off eye also causes reduced withdrawal tension in the thread during normal positive thread supply as well.
In general terms, the present inuention provides a thread storage feeder for textile machines which can be used at least in a positive feed mode, compris~ng a rotatable storage member, means for winding a thread on the storage member and for displacing the w~nd;`ngs ax~ally in order to , "
", , , , . " , . , , ., . , . , . . , ~ ,: "
10~450 form a thread reservoir on the storage member from which thread can be withdrawan in the ax~al d~rect1on over a rim of the storage member, a thread control element wh~ch does not completely enclose the thread positioned, or positionable for positive feed operation, in the ~ithdrawal path of the thread near the said rim so as to contact the withdrawn thread under normal withdrawal tension, a thread guide for guiding the withdrawn thread along the axis of winding and a stop motion or indicating means having a thread . engaging actuating member positioned intermediate of the thread control element and the thread guide, there being : no intervening thread guide on said axis between the thread control element and the actuating member the.actuating membex being ~iassed to urge the thread.towards- the position which the thread in the vicinity of the actuattng member tends to . assume due to the frictional drag ~mposed upon the thread by said rim upon a drop in withdrawal tension suff~cient to cause movement of the thread away from said control element.
, - In a particularly preferred embodiment of the . present invention, a storage feeder is provided as described in the preceding paragraph, intended to be mounted with the axis of winding vertical and.with the thread with- :
. drawn downwardly, wherein the actuating.. member is biassed towards a position below a point on the rim locus of the ~
~. storage member towards which the thread at the rim of the :. :
storage member is carried upon the said drop in tension.
One.embodiment o~ the ~nVention.i~ illustrated in the drawing, in which:-Fîgure 1 is a side elevation of an inventive thread supply device in a position dur~ng normal positive thread :
i ., , .",, .~ ,,,., " , ... . . . ... .. .... ..
~)4~450 supply device and Figure 2 shows the thread supply de~ce accordingto Figure 1 in a position during an inadmissibly high reduction in the w~thdra~al tension of the thread.
~` In the drawing, 1 ~s a thread drum which is rotatably journaled in a housing 2. The housing 2 is secured ~ -to a textile machine, in particular a knitting machine, by means which are not shown in the dxa~ing, a plurality of supply devices corresponding to t~e number of knitting systems being provided in the knitting machines. The drum 1 is driven via a --~
pin wheel 3 and a perforated belt ~not shown2 which cooperates ~--with the pin wheel and which is dxiven synchronously with the J textile machine. The thread F issues from a supply bobbin (not shown2, passes through a preliminar~ braking means 4, a disc brake 5 and a thread monitoring device 6 to be wound tangentially upon the thread drum 1 which rotates in the direction indicated by the arrow P. The thread drum 1 is associated with an inclined displacement disc 7 which displaces the thread windings which are formed in axiàl direction along the thread drum so that an intermediate thread supply V is formed on the drum. The thread is unwound from the intermediate ~ -~ supply V through a braking ring 8 in vertical direction and i over a lower withdrawal rim la of the thread drum 1. The . I . .
unwindlng thread F' passes through a withdrawal eye assembly , illustrated by number 9 in Fig. 1. This consists of a station- -.
i ary withdrawal eye 10, which i8 located on the imaginary axis A
of the thread drum, and of a cut-o~f eye 11 which is the thread eye fir~t reached by the unwinding t~hread F' after leaving the withdrawal rim la. From the withdrawal eye 10, the thread arrives at the working stat~on o~ the textile machine, for , ~3~51:~
example at the thread ~u~de element of the knittin~ system of a knitt~ng mach~ne. The w~thdra~al eye 10 ~s ~ournaled at the free end of a support arm 13 wh~ch extends outside the thread drum 1 parallel to the imag~nary axis A thereof and which is mounted ~n the housing 2 at its ot~er end.
` Directly below the w~thdra~al r~m la, there is journaled on the support arm 13 by means of a hub 14 a hook 15 which can be i pivoted in the plane of the draw~ng l'n the case of the illustra~
ted embodiment from the posit~on shown in the drawing, in which the mouth of the hook which is open toward the vie~er of the drawing projects into the path of the thread F', into a position in which it does not project into the path of the unwinding thread. This pivotability serves to switch over from positive to intermittent thread supply and is not of prime importance for the present invention, nor is it essential that this be a hook.
It could also be any other thread control element, for example, a rod as long as the unwinding thread is not completely enclosed by this thread control element.
. :. .
The cut-off eye ll is positioned on a pivotal arm 16 which is urged by a spring (not shown~ such that the cut-off eye ll tends to pivot about an axis B, clockwise in a top elevation, i.e. out of the plane of the drawing toward the viewer. ~ -.. . .
The mode of operation is as follows:
The withdrawal tension in the thread section F' removes the thread vertically from the bottom of the thread drum l. The speed of withdrawl a~d the speed of rotation of the thread drum 1 are co-ordinated so that the un~inding thread F' has a sllght tendency to travel about the w~thdra~al rim la - imagined as being stationary - contrary to t~e direction of rotation P of the thread drum. The hook 15 howe~er ~s in the path of this .' ' ' ' ' .
_ 7 ~
movement so that the location at wh~ch the thr~ad P' l~ayes the withdrawal rim la is normally f~xed ~n space. This normal point of withdrawal is character~zed as Ap in Pig. 1. It lies directly above the hook 15. By maintaining the point of withdrawal Ap contrary to the d~rection of drum rotation, only that amount of thread may be unwound from the drum 1 as is released during ro-tation of the drum at the point of ~ithdrawal Ap above the hook 15. This ensures positive thread supply.
The w~thdra~al tension present ~n the unwinding thread F' causes the thread to be taut between the point of withdra~al Ap and the withdrawal eye 10. This taut thread holds the cut-off eye 11 in the position shown in Fig. 1 against the spring force acting on the eye. In this position, the cut-off eye is positioned coaxially relative to the withdrawal eye.
. s ; I~ the withdrawal tension is reduced, for example because ~ :
-~ the textile machine does not require as~much thread as the supply device is supplying or because the thread is jammed somewhere along the path between the supply device and the ?, textile machine due, for example, to dirt in the thread guide - or because an already formed tangle between the thread supply ~ -device and the textile machine has become untangled, the ten- -dency of the unwinding thread F' to travel about the withdraw- - -.. . . .
al rim la opposite the direction of rotation P due to the -i withdrawal tension not only stops, but also reverses so that the thread drum 1 pulls the unwinding thread F' along a bit in the sense of rotation P. As is shown in Fig. 2, the thread F' thus leaves the hook 15 and escapes laterally. The point -of withdrawal, i.e. the locatlon at which the thread F' passes over the withdrawal rim la, moVes along the withdrawal rim ia in a circular path an~ reaches the location Ap' shown in Fig. 2 for instance. The unwind~n~ thread F' extends between the point of withdrawal Ap' and the ~thdrawal eye 10. The point of with-drawal Ap' is d~splaced along a c~rcle def~ned by the withdrawal rim la in the same d~rection ~n w~ich the spring attempts to urge the cut-off eye 11. The res~dual tension in the thread F' thus coacts with tRe spring force to p~vot the cut-off eye 11 into the position shown in ~ig. 2 ~n ~hich it de-activates the textile machine by means of a conventional sw~tching assembly (not sho~n~ and~or activates an ~ndicating means 17.
The invention is not lim~ted to the embodiment described herein. As already mentioned, the hook may be replaced by a rod or by another thread control element as long the thread F' is permitted to leave the thread control element laterally when the withdrawal tension is reduced. The cut-off eye 11 does not have to be eye-shaped in configù~ration. A guide element abutt-ing on the unwinding thread laterally would also suffice. It is only essential that no other thread guide element be located between the withdrawal rim la and the cut-off eye 11. This would make it necessary for the cut-off eye to laterally de-flect the thread in the form of a loop when the withdrawal -~
tension decreases.
.. .:
In principle, the intention may also be used on thread -supply devices with stationary thread drums. In this case, a rotating winding element is provided which would have to be -connected to the thread control element. If the thread supply `becomes excessive, thé unwinding thread leaves the control ele-ment in this case as well as arrives in a position in which it coacts to pivot the cut-off eye.
, .
The rotating thread drum pulls the un~inding thread along in the direction of rotation so that the point at which the thread leaves the withdrawal r~m travels in the d~rection of drum rotation away from the thread control element along a circular path determined by the circumference of the withdrawal rim.
Due to this movement, t~e thread unwind~ng from the drum attempts to pivot the cut-off eye, ~hich it reaches f~rst, ~ ~
in a lateral d~rection toward the locatton at which the displaced -point of withdrawal is located due to the residual tension ',."--"~7".
still present in t~e thread.~ Since the cut-off eye is urged -in the same dlrection due to the spring force acting there- -upon, the residual withdrawal tension in the thread and the spring force enhance one another. A very slight spring force is thus sufficient to indicate an inadmissible decrease in the withdrawal tension at the cut-off. The reduced spring force acting on the cut-off eye also causes reduced withdrawal tension in the thread during normal positive thread supply as well.
In general terms, the present inuention provides a thread storage feeder for textile machines which can be used at least in a positive feed mode, compris~ng a rotatable storage member, means for winding a thread on the storage member and for displacing the w~nd;`ngs ax~ally in order to , "
", , , , . " , . , , ., . , . , . . , ~ ,: "
10~450 form a thread reservoir on the storage member from which thread can be withdrawan in the ax~al d~rect1on over a rim of the storage member, a thread control element wh~ch does not completely enclose the thread positioned, or positionable for positive feed operation, in the ~ithdrawal path of the thread near the said rim so as to contact the withdrawn thread under normal withdrawal tension, a thread guide for guiding the withdrawn thread along the axis of winding and a stop motion or indicating means having a thread . engaging actuating member positioned intermediate of the thread control element and the thread guide, there being : no intervening thread guide on said axis between the thread control element and the actuating member the.actuating membex being ~iassed to urge the thread.towards- the position which the thread in the vicinity of the actuattng member tends to . assume due to the frictional drag ~mposed upon the thread by said rim upon a drop in withdrawal tension suff~cient to cause movement of the thread away from said control element.
, - In a particularly preferred embodiment of the . present invention, a storage feeder is provided as described in the preceding paragraph, intended to be mounted with the axis of winding vertical and.with the thread with- :
. drawn downwardly, wherein the actuating.. member is biassed towards a position below a point on the rim locus of the ~
~. storage member towards which the thread at the rim of the :. :
storage member is carried upon the said drop in tension.
One.embodiment o~ the ~nVention.i~ illustrated in the drawing, in which:-Fîgure 1 is a side elevation of an inventive thread supply device in a position dur~ng normal positive thread :
i ., , .",, .~ ,,,., " , ... . . . ... .. .... ..
~)4~450 supply device and Figure 2 shows the thread supply de~ce accordingto Figure 1 in a position during an inadmissibly high reduction in the w~thdra~al tension of the thread.
~` In the drawing, 1 ~s a thread drum which is rotatably journaled in a housing 2. The housing 2 is secured ~ -to a textile machine, in particular a knitting machine, by means which are not shown in the dxa~ing, a plurality of supply devices corresponding to t~e number of knitting systems being provided in the knitting machines. The drum 1 is driven via a --~
pin wheel 3 and a perforated belt ~not shown2 which cooperates ~--with the pin wheel and which is dxiven synchronously with the J textile machine. The thread F issues from a supply bobbin (not shown2, passes through a preliminar~ braking means 4, a disc brake 5 and a thread monitoring device 6 to be wound tangentially upon the thread drum 1 which rotates in the direction indicated by the arrow P. The thread drum 1 is associated with an inclined displacement disc 7 which displaces the thread windings which are formed in axiàl direction along the thread drum so that an intermediate thread supply V is formed on the drum. The thread is unwound from the intermediate ~ -~ supply V through a braking ring 8 in vertical direction and i over a lower withdrawal rim la of the thread drum 1. The . I . .
unwindlng thread F' passes through a withdrawal eye assembly , illustrated by number 9 in Fig. 1. This consists of a station- -.
i ary withdrawal eye 10, which i8 located on the imaginary axis A
of the thread drum, and of a cut-o~f eye 11 which is the thread eye fir~t reached by the unwinding t~hread F' after leaving the withdrawal rim la. From the withdrawal eye 10, the thread arrives at the working stat~on o~ the textile machine, for , ~3~51:~
example at the thread ~u~de element of the knittin~ system of a knitt~ng mach~ne. The w~thdra~al eye 10 ~s ~ournaled at the free end of a support arm 13 wh~ch extends outside the thread drum 1 parallel to the imag~nary axis A thereof and which is mounted ~n the housing 2 at its ot~er end.
` Directly below the w~thdra~al r~m la, there is journaled on the support arm 13 by means of a hub 14 a hook 15 which can be i pivoted in the plane of the draw~ng l'n the case of the illustra~
ted embodiment from the posit~on shown in the drawing, in which the mouth of the hook which is open toward the vie~er of the drawing projects into the path of the thread F', into a position in which it does not project into the path of the unwinding thread. This pivotability serves to switch over from positive to intermittent thread supply and is not of prime importance for the present invention, nor is it essential that this be a hook.
It could also be any other thread control element, for example, a rod as long as the unwinding thread is not completely enclosed by this thread control element.
. :. .
The cut-off eye ll is positioned on a pivotal arm 16 which is urged by a spring (not shown~ such that the cut-off eye ll tends to pivot about an axis B, clockwise in a top elevation, i.e. out of the plane of the drawing toward the viewer. ~ -.. . .
The mode of operation is as follows:
The withdrawal tension in the thread section F' removes the thread vertically from the bottom of the thread drum l. The speed of withdrawl a~d the speed of rotation of the thread drum 1 are co-ordinated so that the un~inding thread F' has a sllght tendency to travel about the w~thdra~al rim la - imagined as being stationary - contrary to t~e direction of rotation P of the thread drum. The hook 15 howe~er ~s in the path of this .' ' ' ' ' .
_ 7 ~
movement so that the location at wh~ch the thr~ad P' l~ayes the withdrawal rim la is normally f~xed ~n space. This normal point of withdrawal is character~zed as Ap in Pig. 1. It lies directly above the hook 15. By maintaining the point of withdrawal Ap contrary to the d~rection of drum rotation, only that amount of thread may be unwound from the drum 1 as is released during ro-tation of the drum at the point of ~ithdrawal Ap above the hook 15. This ensures positive thread supply.
The w~thdra~al tension present ~n the unwinding thread F' causes the thread to be taut between the point of withdra~al Ap and the withdrawal eye 10. This taut thread holds the cut-off eye 11 in the position shown in Fig. 1 against the spring force acting on the eye. In this position, the cut-off eye is positioned coaxially relative to the withdrawal eye.
. s ; I~ the withdrawal tension is reduced, for example because ~ :
-~ the textile machine does not require as~much thread as the supply device is supplying or because the thread is jammed somewhere along the path between the supply device and the ?, textile machine due, for example, to dirt in the thread guide - or because an already formed tangle between the thread supply ~ -device and the textile machine has become untangled, the ten- -dency of the unwinding thread F' to travel about the withdraw- - -.. . . .
al rim la opposite the direction of rotation P due to the -i withdrawal tension not only stops, but also reverses so that the thread drum 1 pulls the unwinding thread F' along a bit in the sense of rotation P. As is shown in Fig. 2, the thread F' thus leaves the hook 15 and escapes laterally. The point -of withdrawal, i.e. the locatlon at which the thread F' passes over the withdrawal rim la, moVes along the withdrawal rim ia in a circular path an~ reaches the location Ap' shown in Fig. 2 for instance. The unwind~n~ thread F' extends between the point of withdrawal Ap' and the ~thdrawal eye 10. The point of with-drawal Ap' is d~splaced along a c~rcle def~ned by the withdrawal rim la in the same d~rection ~n w~ich the spring attempts to urge the cut-off eye 11. The res~dual tension in the thread F' thus coacts with tRe spring force to p~vot the cut-off eye 11 into the position shown in ~ig. 2 ~n ~hich it de-activates the textile machine by means of a conventional sw~tching assembly (not sho~n~ and~or activates an ~ndicating means 17.
The invention is not lim~ted to the embodiment described herein. As already mentioned, the hook may be replaced by a rod or by another thread control element as long the thread F' is permitted to leave the thread control element laterally when the withdrawal tension is reduced. The cut-off eye 11 does not have to be eye-shaped in configù~ration. A guide element abutt-ing on the unwinding thread laterally would also suffice. It is only essential that no other thread guide element be located between the withdrawal rim la and the cut-off eye 11. This would make it necessary for the cut-off eye to laterally de-flect the thread in the form of a loop when the withdrawal -~
tension decreases.
.. .:
In principle, the intention may also be used on thread -supply devices with stationary thread drums. In this case, a rotating winding element is provided which would have to be -connected to the thread control element. If the thread supply `becomes excessive, thé unwinding thread leaves the control ele-ment in this case as well as arrives in a position in which it coacts to pivot the cut-off eye.
, .
Claims (9)
1. A thread storage feeder for textile machines which can be used at least in a positive feed mode, comprising a rotatable storage member, means for winding a thread on the storage member and for displacing the windings axially in order to form a thread reservoir on the storage member from which thread can be withdrawn in the axial direction over a rim of the storage member, a thread control element which does not completely enclose the thread positioned or positionable for positive feed operation" in the withdrawal path of the thread near the said rim so as to contact the withdrawn thread under normal withdrawal tension, a thread guide for guiding the withdrawn thread along the axis of winding and a stop motion or indicating means having a thread engaging actuating member positioned intermediate of the thread control element and the thread guide, there being no intervening thread guide on said axis between the thread control element and the actuating member, the actuating member being biassed to urge the thread towards the position which the thread in the vicinity of the actuating member tends to assume due to the frictional drag imposed upon the thread by said rim upon a drop in withdrawal tension sufficient to cause movement of the thread away from said control element.
2. A thread storage feeder as claimed in claim 1 intended to be mounted with the axis of winding vertical and with the thread withdrawn downwardly, wherein the actuating member is biassed towards a position below a point on the rim locus of the storage member towards which the thread at the rim of the storage member is carried upon the said drop in tension.
3. A thread storage feeder as claimed in claim 1 or claim 2 which is arranged for alternative operation in a positive feed mode or an intermittent thread withdrawal mode, the control element being movable into and away from the said withdrawal path so as to contact the thread only in the positive feed mode.
4. A thread storage feeder as claimed in claim 1 or claim 2 wherein the control element is mounted in a position spaced from the storage member.
5. A thread storage feeder as claimed in claim 1 or claim 2 wherein the control element, the thread guide and the actuating member are mounted on a support extending parallel to the axis of the storage member.
6. A thread storage feeder as claimed in claim 1 or claim 2 which is arranged for alternative operation in a positive feed mode or an intermittent thread withdrawal mode, the control element being movable into and away from the said withdrawal path so as to contact the thread only in the positive feed mode, wherein the control element is mounted in a position spaced from the storage member.
7. A thread storage feeder as claimed in claim 1 or claim 2 which is arranged for alternative operation in a positive feed mode or an intermittent thread withdrawal mode, the control element being movable into and away from the said withdrawal path so as to contact the thread only in the positive feed mode, wherein the control element, the thread guide and the actuating member are mounted on a support extending parallel to the axis of the storage member.
8. A thread storage feeder as claimed in claim 1 or 2 wherein the control element is mounted in a position spaced from the storage member, the control element, the thread guide and the actuating member being mounted on a support extending parallel to the axis of the storage member.
9. A thread storage feeder as claimed in claim 1 or claim 2 which is arranged for alternative operation in a positive feed mode or an intermittent thread withdrawal mode, the control element being movable into and away from the said withdrawal path so as to contact the thread only in the positive feed mode, the control element being mounted in a position spaced from the storage member, wherein the control element, the thread guide and the actuating member are mounted on a support extending parallel to the axis of the storage member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2341498A DE2341498C2 (en) | 1973-08-16 | 1973-08-16 | Thread delivery device for textile machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044450A true CA1044450A (en) | 1978-12-19 |
Family
ID=5889955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA207,152A Expired CA1044450A (en) | 1973-08-16 | 1974-08-15 | Thread supply device for textile machines |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US3928987A (en) |
| JP (1) | JPS5754422B2 (en) |
| AR (1) | AR203570A1 (en) |
| AT (1) | AT337336B (en) |
| BE (1) | BE818318A (en) |
| BR (1) | BR7406738D0 (en) |
| CA (1) | CA1044450A (en) |
| CH (1) | CH573857A5 (en) |
| CS (1) | CS169775B2 (en) |
| DD (1) | DD113033A5 (en) |
| DE (1) | DE2341498C2 (en) |
| DK (1) | DK135461C (en) |
| FR (1) | FR2240973B1 (en) |
| GB (1) | GB1443305A (en) |
| HU (1) | HU172381B (en) |
| IE (1) | IE39735B1 (en) |
| IL (1) | IL45302A (en) |
| IT (1) | IT1016808B (en) |
| NL (1) | NL7410792A (en) |
| PL (1) | PL93564B1 (en) |
| RO (1) | RO71212A (en) |
| SE (1) | SE7410399L (en) |
| SU (1) | SU618027A3 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2444186A1 (en) * | 1974-09-16 | 1976-03-25 | Iro Ab | THREAD DELIVERY DEVICE FOR TEXTILE MACHINERY |
| DE2461938A1 (en) * | 1974-12-31 | 1976-07-08 | Gustav Memminger | THREAD DELIVERY DEVICE FOR POSITIVE THREAD DELIVERY IN TEXTILE MACHINES |
| US4137731A (en) * | 1976-02-11 | 1979-02-06 | Aktiebolaget Iro | Thread supply device for textile machine having common thread control and tension sensing element |
| DE2608590C3 (en) * | 1976-03-02 | 1980-08-28 | Memminger Gmbh, 7290 Freudenstadt | Yarn feeding device |
| US4106713A (en) * | 1976-05-12 | 1978-08-15 | Aktiebolaget Iro | Thread feeder for textile machines |
| DE2637120C2 (en) * | 1976-08-18 | 1985-12-12 | Aktiebolaget Iro, Ulricehamn | Yarn feeding device for textile machines |
| DE2642183C2 (en) * | 1976-09-20 | 1984-12-06 | Memminger Gmbh, 7290 Freudenstadt | Thread delivery device, in particular for knitting machines |
| DE2710821C3 (en) * | 1977-03-11 | 1981-07-23 | Aktiebolaget Iro, Ulricehamn | Yarn feeding device for textile machines |
| SE8305194D0 (en) * | 1983-09-27 | 1983-09-27 | Iro Ab | YARN FEEDING DEVICE |
| US4691873A (en) * | 1986-06-06 | 1987-09-08 | Alan Gutschmit | Strand storing and delivering device |
| EP0396902B1 (en) * | 1989-05-12 | 1994-06-15 | Lindauer Dornier Gesellschaft M.B.H | Unreeling method and dispenser for yarn as application for this method |
| CN102704168A (en) * | 2012-06-08 | 2012-10-03 | 慈溪太阳洲纺织科技有限公司 | Yarn delivering wheel for knitting machine |
| CN103114373B (en) * | 2013-03-07 | 2014-04-16 | 慈溪太阳洲纺织科技有限公司 | Yarn storage device of knitting machine |
| ITBS20130089A1 (en) * | 2013-06-21 | 2014-12-22 | Santoni & C Spa | DELIVERY ELEMENT OF THE THREAD FOR A LEAD GUIDE FOR TEXTILE MACHINES, AND LEAD GUIDE INCLUDING THIS SUPPLY ELEMENT |
| CN105369455A (en) * | 2015-06-05 | 2016-03-02 | 欧真自动化科技（上海）有限公司 | Synchronous servo weft accumulator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3347436A (en) * | 1965-02-27 | 1967-10-17 | Mayer & Cie Fa | Yarn feed installation |
| US3490710A (en) * | 1967-07-31 | 1970-01-20 | Fouquet Werk Frauz & Planck | Automatic thread delivery device for textile machines |
| US3844504A (en) * | 1972-04-05 | 1974-10-29 | Lawson Hemphill | Method and apparatus for handling yarn |
-
1973
- 1973-08-16 DE DE2341498A patent/DE2341498C2/en not_active Expired
-
1974
- 1974-07-18 IL IL45302A patent/IL45302A/en unknown
- 1974-07-18 HU HU74IO00000216A patent/HU172381B/en unknown
- 1974-07-25 CS CS5321A patent/CS169775B2/cs unknown
- 1974-07-26 FR FR7426044A patent/FR2240973B1/fr not_active Expired
- 1974-07-31 BE BE147138A patent/BE818318A/en unknown
- 1974-08-06 GB GB3460774A patent/GB1443305A/en not_active Expired
- 1974-08-07 CH CH1079574A patent/CH573857A5/xx not_active IP Right Cessation
- 1974-08-08 US US495880A patent/US3928987A/en not_active Expired - Lifetime
- 1974-08-09 IT IT69515/74A patent/IT1016808B/en active
- 1974-08-09 AR AR255143A patent/AR203570A1/en active
- 1974-08-12 NL NL7410792A patent/NL7410792A/en not_active Application Discontinuation
- 1974-08-12 IE IE1692/74A patent/IE39735B1/en unknown
- 1974-08-14 PL PL1974173484A patent/PL93564B1/pl unknown
- 1974-08-14 DD DD180503A patent/DD113033A5/xx unknown
- 1974-08-14 DK DK433374A patent/DK135461C/en active
- 1974-08-14 RO RO7479783A patent/RO71212A/en unknown
- 1974-08-15 SU SU742058362A patent/SU618027A3/en active
- 1974-08-15 SE SE7410399A patent/SE7410399L/xx unknown
- 1974-08-15 CA CA207,152A patent/CA1044450A/en not_active Expired
- 1974-08-16 AT AT672174A patent/AT337336B/en not_active IP Right Cessation
- 1974-08-16 JP JP49093482A patent/JPS5754422B2/ja not_active Expired
- 1974-08-16 BR BR6738/74A patent/BR7406738D0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SU618027A3 (en) | 1978-07-30 |
| CS169775B2 (en) | 1976-07-29 |
| PL93564B1 (en) | 1977-06-30 |
| RO71212A (en) | 1981-07-30 |
| IT1016808B (en) | 1977-06-20 |
| FR2240973B1 (en) | 1978-12-29 |
| SE7410399L (en) | 1975-02-17 |
| IL45302A (en) | 1977-11-30 |
| BE818318A (en) | 1974-11-18 |
| AU7167274A (en) | 1976-01-29 |
| JPS5754422B2 (en) | 1982-11-18 |
| CH573857A5 (en) | 1976-03-31 |
| DK433374A (en) | 1975-04-14 |
| GB1443305A (en) | 1976-07-21 |
| DD113033A5 (en) | 1975-05-12 |
| DE2341498C2 (en) | 1975-10-02 |
| DK135461C (en) | 1977-10-17 |
| JPS5048253A (en) | 1975-04-30 |
| IE39735B1 (en) | 1978-12-20 |
| DK135461B (en) | 1977-05-02 |
| AR203570A1 (en) | 1975-09-22 |
| AT337336B (en) | 1977-06-27 |
| US3928987A (en) | 1975-12-30 |
| NL7410792A (en) | 1975-02-18 |
| HU172381B (en) | 1978-08-28 |
| IE39735L (en) | 1975-02-16 |
| BR7406738D0 (en) | 1975-05-27 |
| FR2240973A1 (en) | 1975-03-14 |
| DE2341498B1 (en) | 1975-02-13 |
| ATA672174A (en) | 1976-10-15 |
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