[0001] The present invention relates to a device for stopping a rove supply in a spinning
or twisting apparatus after the break of a yarn according to the preamble of claim
1. The purpose of such stopping devices is to prevent a rove, which is supplied to
a drafting zone of such a twisting apparatus, from being continuously delivered even
after a yarn break has occurred. The stopping device is provided in order to stop
a rove before the back rollers of a drafting zone of the spinning apparatus so that
the elements of the drafting zone are prevented from damage and that the formation
of a lap of fibres of rove material around the rollers is avoided. Such yarn breaks
are a major problem in spinning machineries. Not only is the continuous operation
of the spinning interrupted, but also the total efficiency of the spinning is decreased.
After such a break of the yarn, the operator of the spinning apparatus does not only
have to reinstall the correct connection of the rove with the spun yarn on the delivery
end of the drafting zone, but often has to remove waste material of rove, which, after
a yarn break, has been further delivered into the rollers of the drafting zone. In
order to reduce the damage and efficiency losses due to such a yarn break, several
types of devices have been proposed in the prior art as known e.g. from
FR 2 050 634 A5.
[0002] For example, pneumatic stopping devices have been used in dry spinning devices, with
a suction nozzle being arranged close to the yarn so that any fibre, which comes out
at the front end of a drafting zone and which is not formed into a yam, is collected
by the suction nozzle. Such pneumatic devices with a suction nozzle therefore stop
the fibres or material from wrapping around the delivery roller in the drafting zone.
One disadvantage of such a type of pneumatic stopping device is that the amount of
waste material is considerably increased, because the delivery of the rove is not
stopped, but the material is only guided to a waste container. For a reintroduction
of such waste material, the fibres have to undergo again the preparation processes
as known to a person skilled in the art. A further disadvantage of such pneumatic
devices in dry spinning processes is the increase in energy consumption. The pneumatic
device has to be operated at all times and at all spinning positions in the spinning
apparatus.
[0003] In the area of wet spinning, the spinning of linen, for example, another type of
stopping device has been used in the prior art so far: first, there are mechanical
devices, which comprise a number of different levers, which are arranged close to
the entry of the drafting zone and which are provided to stop the rove directly before
the entry into the drafting zone. The construction of such mechanical devices is rather
complex and requires an adaptation of the spinning apparatus. Other mechanical systems
for stopping a rove lead to the stop of the operation of the feed rollers after the
break of a yarn. For example, rove stopping systems are known which operate by stopping
a feed pressing roller without stopping the parallel roller. These systems act by
blocking in different ways only one of the feed rollers. However, such systems are
not very reliable and are very difficult to maintain. This system further has the
disadvantage that not only one - spinning position is interrupted due to the yarn
break, but that also the other, parallel spinning positions have to be stopped until
the yam break has been repaired. Furthermore, in the prior art, rather complex stopping
devices with electronic systems, such as piezoelectric sensors, have been developed
in order to detect the yam break and to react upon the occurrence of a yam break signal,
for example by cutting the rove behind the back rollers. Such electronic systems are
complex in construction and not very reliable in dirty and sometimes wet conditions
and require a lot of maintenance. The optical sensors are sensitive to dirt and furthermore
require a complex integration of the stop system into the control of the spinning
apparatus.
[0004] In view of these disadvantages of the prior art stopping devices, it is a problem
of the present invention to provide a device for stopping a rove delivery after the
break of a yarn in a spinning apparatus, which is reliable in the functioning, is
easy to use, saves energy and prevents an increase in waste material upon the break
of a yarn and an efficiency decrease in spinning. Furthermore, it is an object of
the present invention to provide such a stopping device, which is adaptable to different
types of spinning apparatuses without a major change in the existing constructions.
[0005] This problem is solved by means of a device for stopping a rove supply according
to the features of claim 1. According to the invention, a device as defined in claim
1 for stopping a rove supply in a spinning apparatus is provided, which comprises
a mechanical sensing lever with a sensing pin being repeatedly in contact with the
yarn at the output side of a drafting zone of a spinning apparatus, which is pivotally
mounted on a pivot axis, wherein the device is characterized in that said sensing
lever has a release lever opposite to said sensing lever, which release lever is provided
with a longitudinal release part being in engagement with a spring-loaded clamp device
such that in normal operation the clamp device is open and is closed after the break
of a yarn through the conjoint pivot movement of said sensing lever and said release
lever about said pivot axis in order to firmly clamp the rove at the input side of
the drafting zone before the back rollers of the drafting zone of the spinning apparatus.
If the yarn breaks at the delivery end or output side of the drafting zone, the mechanical
clamp device is immediately closed and will firmly hold the rove at the input side
of the drafting zone. Due to the further rotational movement of the rollers in the
drafting zone, the rove will consequently be broken well before the input side of
the drafting zone so that the further supply of rove into the spinning apparatus is
prevented. The stop of the rove supply is very reliable, as the elements of the stopping
device are purely mechanical. The clamp device as well as the sensing lever with its
release lever function without the use of complex sensors or control devices.
[0006] In an advantageous form of realization of the invention, the clamp device is arranged
in a predetermined distance from the entry of the drafting zone, i.e. a distance from
the back rollers. Since the clamp device is arranged at the input side in a distance
from the drafting zone and not within the drafting zone, the installation of the stopping
device does not require any changes in the construction or design of the spinning
apparatus. The device may be simply installed without any impact on the normal functioning
of the spinning apparatus. At the delivery side (output side) of the drafting zone,
the sensing lever is repeatedly brought into contact with the yarn such that a yarn
break in this critical section is immediately sensed by the sensing lever. According
to an aspect of the invention, the frequency of sensing contacts and the pressure
of these contacts can be adjusted to suit all yarn counts. Upon yam break, the sensing
lever immediately moves together with the release lever in a pivot movement into such
a position that the clamp device at the input end of the drafting zone is directly
activated. By means of relatively simple mechanical elements, a surprising, efficient
stopping action is created. Since the sensing lever and the release lever activate
the preloaded clamp device directly and not by means of several intermediate levers
or gears, the stopping device according to the invention is very reliable and not
prone to disturbances, e.g. due to dirt or other surrounding influences. Due to the
special mechanical design and construction of the stopping device according to the
invention, the device does not require any additional energy for its operation. This
leads to energy savings in comparison to pneumatic or electronic rove stop systems
as they have been used in the prior art.
[0007] The conjoint pivot movement of the sensing lever and the release lever for releasing
the preloaded clamp device has the advantage that, after the break of a yarn, the
operator of the spinning apparatus receives also a visual indication in a row of a
large number of spinning positions in a spinning apparatus. The end of the sensing
lever with its sensing pin will protrude compared to the other sensing levers in the
row of spinning positions so that an immediate visual indicator is given that the
operator has to take action and repair the disorder in a specific position. Since
the rove is not cut, but is actively clamped through the clamp device, in particular
corresponding eccentric clamp elements, the restoration of the correct operation is
rather simple to realize. The operator does not have to search for the rove end, but
can directly take the clamped rove end and reintroduce it into the drafting zone and
connect it with the already drafted yam at the output side. The handling of the stopping
device is therefore very simple and reliable. Furthermore, the mechanical construction
and the form of the stopping device according to the invention with a sensing pin
and a sensing lever at the output side of the drafting zone and a clamp device at
the input side are advantageous in that the stopping device can also be installed
in existing spinning apparatuses. No changes have to be made in the drafting zone
of the spinning apparatus. The stopping device according to the invention can simply
be attached to the existing frames or drive shafts of the spinning machinery since
it is specifically designed without components inside of the area of the drafting
zone.
[0008] According to the main embodiment of the present invention, the sensing lever and
the release lever of the stopping device have an essentially L-shaped integral form
and/or the sensing pin is provided as a separate and exchangeable element. The L-shape
has the advantage that the stopping device may be mounted behind the drafting zone
without a change in the construction of the existing spinning apparatus. According
to an advantageous embodiment of the invention, the sensing lever and the release
lever are formed in a single-piece element, for example by moulding of a plastic material
or the like. The single-piece construction of the levers has the advantage that only
a reduced number of different elements and moving parts for the device are required.
Nevertheless, the sensing lever and the release lever provide together with the preloaded
clamp device a very reliable and fast stop action after the break of a yarn. The reduced
number of parts of the stopping device has also the advantage that the device is less
sensitive to damages. In case there still occurs a damage of one of the parts, it
may simply be exchanged with new parts, as the stopping device is easily accessible
from the outside of the machinery. By means of the sensing pin in form of a separate
and exchangeable element it is possible to accommodate all different positions of
the yarn as required. The sensing pin may be provided in different shapes and sizes
to adapt its position on different designs of spinning frames. The different sizes
and weights of sensing pins may be corrected by exchanging a counter-balance or its
position on the backside of the sensing lever.
[0009] The clamp device comprises two opposite counter-acting eccentric clamps, which are
pivotally mounted on both sides of the rove such that a pulling force of said yarn
by means of the rollers in the drafting zone will automatically increase the clamping
effect of said clamp device. This measure prevents that the stop of the rove is unintentionally
released. A further pull on the rove from the side of the drafting zone will inevitably
lead to an increase in the clamping effect. The clamping of the rove is therefore
not only guaranteed by means of the preloading through a spring or the like, but also
through the specific construction and arrangement of the clamp elements of the clamp
device. By means of these measures, the reliability of the device is increased.
[0010] According to a further embodiment of the invention, the clamp device has a preloading
spring for an automatic closing of the clamps upon release through the release part
of the release lever/sensing lever. In the open state, the clamp device is securely
held by the release lever against the preloading force of the spring of the clamp
device. After the release part of the release lever has moved in a specific position,
the clamp device is automatically activated and will due to the preloading force directly
change from its open state into its closed state, in which the rove passing through
the gap between the clamp elements of the clamp device is firmly held through a clamp
action. The provision of a spring for preloading one or both of the clamp elements
of the clamp device is a simple and nevertheless very reliable means. According to
an advantageous aspect of the invention, the preloading spring may be integrated within
a clamp element so that the spring, which is normally made of metal, is protected
against corrosion due to the sometimes wet environment.
[0011] According to a further embodiment of the invention, the sensing lever is pivotally
mounted on a common support element with said pivot axis and a rocking cam, which
rocking cam is directly or indirectly driven by the back rollers or the shaft of the
back rollers of a drafting zone of the spinning apparatus such that the sensing lever
is repeatedly moved against said yam at the output side of the drafting zone. The
common support element further simplifies the construction and the installation of
the stopping device also in existing spinning apparatuses. The rocking cam may be
installed on the common support element close to, for example, the back rollers of
the drafting zone, which may be used for the rotational movement of the rocking cam
in such a manner that the cam surface is in contact with an inside surface of the
sensing lever and/or activating lever. Through these measures according to the invention,
the sensing lever and its sensing pin are repeatedly brought into contact with the
yarn in order to mechanically sense whether or not a yam break has occurred. According
to an advantageous characteristic of the invention, such a repeated rocking or forward
movement of the levers of the stopping device against the yam may be realized about
5 times per minute. However, this is not limiting to the scope of the invention, but
is only a particularly advantageous embodiment. According to one further aspect of
the invention, the number of rocking movements and contacts with the yarn may be adjusted.
For example, by changing a gear at the driving end of the cam shaft, the sensing contact
can be varied from 2 to 6 times per minute.
[0012] According to a further embodiment of the invention, the sensing lever and/or the
release lever is provided with a leaf spring element on an inside region coming into
contact with the rocking cam. By means of this, the rocking cam action is absorbed
through the flexible surface of the leaf-spring-type element so that in a closed position
of the stopping device the levers are not damaged. Such a spring element in the form
of a leaf-spring-type element may be provided as a separate leaf spring installed
within a recess in the inner side of the release lever or sensing lever. Alternatively,
the leaf-spring-type element may be formed in an integral shape with the levers, e.g.
by providing a longitudinal slot and a surface with a reduced thickness in the material,
in particular plastic material, of the levers. Other forms of such a soft leaf-spring-type
element may also be provided and are within the knowledge of a person skilled in the
art.
[0013] According to a further embodiment of the invention, a rocking cam for driving the
sensing lever against the yarn and back again is provided with a rocking shaft being
synchronized with the rotational speed of rollers of the drafting zone. Due to these
measures, the movement of the sensing lever is always automatically adapted to the
speed of production of yam in the drafting zone. According to a further aspect of
the invention, the rotational speed of the rocking cam shaft is adjustable, so that
the device has a further possibility of an additional adjustment of the sensing lever
speed.
[0014] According to a further embodiment of the invention, the pivot axis of the sensing
lever is arranged at a predetermined balanced position such that the sensing pin is
repeatedly pushed against the yam with a predetermined force. The balanced mounting
of the sensing lever and the release lever has the advantage that no additional preloading
elements, such as springs or the like, are necessary in order to realize the predetermined
sensing force of the sensing lever. According to a particular embodiment of the invention,
the amount of the sensing force of the sensing lever may be in the range of 50-200
g per push action.
[0015] According to a further embodiment of the invention, the sensing lever is provided
with at least one movable or adjustable balance weight for the adjustment of the specific
pressure or force applied by the sensing pin onto the yam. The movable balance weight
may, for example, be attached to the levers at a discrete number of positions. Through
this measurement, it is possible to easily adjust the sensing force of the sensing
pin without a change in the design of the stopping device and in particular its levers
and without a change in the position of the pivot axis. This simplifies the stopping
device and enables the operator to easily adapt the respective devices to different
spinning apparatuses or conditions.
[0016] According to a further embodiment of the invention, the clamp device has an activating
lever with an engagement portion for engagement with the release part of the release
lever, and furthermore has a release lever for returning the clamp device from its
closed position back into its open position for the restarting of the operation of
the spinning apparatus. The provision of an activating lever has the advantage that
the release end of the release lever may be located not too close to the rove, but
in a certain distance from it. The engagement portion of the activating lever of the
clamp device is during correct operation of the spinning apparatus in engagement with
the release part of the release lever such that the rocking movement of the sensing
lever and release lever does not lead to an inadvertent activation of the clamp device.
According to a further aspect of the invention in this regard, the release part is
provided in the form of a longitudinal groove at the end of the release lever, which
is open to one side. In this groove, the engagement portion of the activating lever
of the clamp device may move by a certain predetermined amount without leaving the
engagement with the levers. Only in the case of a yarn break, when the sensing lever
moves beyond the usual position of the yarn, the groove of the release part is moved
to such a position that the engagement portion of the activating lever of the clamp
device is released. After release, the clamp device is directly closed through the
action of the preloading spring. The engagement portion of the activating lever of
the clamp device is then in a position beyond the end of the release lever such that
the system is effectively deactivated. Only through the active pulling of the release
lever of the clamp device and simultaneously the reintroduction of the engagement
portion into the groove of the release lever through an operator, the system is put
in its preloaded open position again, in which the normal operation of the spinning
can be effected.
[0017] According to a further embodiment of the invention, the stopping device is designed
as a retrofit device, which may be mounted on an existing spinning apparatus, in particular
without major changes in its construction. This makes it possible to install the stopping
device in existing spinning apparatuses of even different types. According to a further
aspect of the invention, the elements of the stopping device are provided with screwless-type
mounting means, in particular in the form of clip-type mounting means. Therefore,
the operator or person who installs the stopping device does not need any tools. The
installation is very fast and simple to realize. Also in case of a damage of one of
the parts of the stopping device, an exchange and repair of the device is easy to
execute.
[0018] The above-mentioned objects, features and advantages of the present invention will
become more apparent from the following detailed description of some preferred embodiments
of the invention made with reference to the accompanying drawings. In the drawings
are:
- Fig. 1
- a perspective view of an embodiment of the stopping device according to the invention,
which is installed in a spinning apparatus having a drafting zone A;
- Fig. 2 and 3
- side views of an embodiment of the stopping device according to the invention showing
different positions of the device in the normal operation of the spinning apparatus;
and
- Fig. 4 and 5
- side views of an embodiment of the stopping device according to the invention showing
different positions after a yarn break has occurred.
[0019] In Figs. 1 to 3, an embodiment of the stopping device according to the invention
is shown in a situation of a normal operation of the spinning apparatus, i.e. before
a yarn break has occurred. The stopping device comprises a mechanical sensing lever
7 being pivotally mounted on a pivot axis X on the back side of a drafting zone A
of the spinning apparatus. At its front end, the sensing lever 7 is provided with
a laterally protruding sensing pin 8, which is repeatedly brought into contact with
the yam 11 by means of a rocking movement of the sensing lever 7. In the figures,
the repeated rocking movement or push of the sensing lever 7 and its sensing pin 8
is indicated by arrow B. The purpose of this repeated contact of the sensing lever
8 and the continuously fed yarn 11 is to monitor the correct operation of the spinning
apparatus, in other words to receive information in case a break of the yarn 11 has
occurred at the delivery side (output side) of the drafting zone A. For providing
the rocking movement B of the sensing pin 8, the sensing lever 7 is in contact with
a rocking cam 15, which is driven by a shaft 18. The rocking cam 15 has a cam surface,
which comes into contact with the inside of the sensing lever 7. Since the sensing
lever 7 is pivotally mounted on the axis X, the rotational movement of the rocking
cam 15 pushes the sensing lever 7 and the sensing pin 8 repeatedly back, so that the
sensing pin 8 is moved against the yarn 11 coming out from the drafting zone A. In
order to realize this rocking function of the sensing lever 7, the sensing lever 7,
which is here formed integrally with a release lever 9, is designed and mounted such
that a specific balanced arrangement is given, so that the sensing pin 8 is pushed
against the yam 11 with a predetermined sensing force, according to an advantageous
example of the invention with a force of about 50 to 200 g. In order to be able to
adjust the sensing force of the sensing pin 8, the sensing lever 7 is here provided
with a protruding further arm on its back side with several groove portions 14, into
which a balance weight 17 may be placed. With five weight adjustment points 14, in
this example realized through grooves, the balance weight 17 can be adjusted in order
to set a predetermined sensing force, which, by the sensing pin 8, is applied onto
the yarn 11 passing by in the feed direction F at the feeding speed.
[0020] From a comparison of Fig. 2 with Fig. 3, the forward and backward movement of the
sensing lever 7 with its sensing pin 8 can be taken. Due to the continuous rotation
of the rocking cam 15 about its rocking shaft 18, the sensing pin 8 is moved from
its contact position with the yam 11 (Fig. 2) back to the position shown in Fig. 3,
in which the sensing pin 8 is in a certain distance from the yam 11 passing by. Then,
the sensing pin 8 is again brought into pushing contact with the yarn 11, as the balance
weight 17 and the form and mounting of the sensing lever 7 are provided such that
the sensing lever 7 will due to the gravity move against the yam 11 (left-hand side
in Figs. 2 and 3). In this embodiment of the invention, the rocking cam 15 comes into
contact with a leaf-spring-type element 16 provided at the inside of the sensing lever
7. The leaf-spring-type element 16 is a flexible part, which avoids the sensing lever
7 from being damaged in a yam break situation, which will be explained in more detail
later in this specification. At the opposite end of the pivot axis X, the sensing
lever 7 is provided with a release part or release lever 9. The release lever 9 is
also moved forward and backward, which is in the drawings shown by arrow B. At the
upper end, the release lever 9 is provided with a release part 9a, which is in this
example realized in the form of a longitudinal groove open to one side. The longitudinal
release part 9a is in this situation of a normal, correct functioning of the drafting
device in engagement with an engagement part 12f of a clamp device 12. In Figs. 1
to 3, the clamp device 12 is shown in its open state, which means that the clamps
12a, 12b are open and provide a certain gap, which is sufficiently large for the passing
of the rove 13 coming from the delivery side of the rove material (cf. arrow F in
Fig. 1 to 3). The clamps 12a, 12b are pivotally mounted to one another, respectively,
and have an outer cam surface, which is formed such that upon closing of the clamp
device an increasing clamp effect is created on the rove 13. The clamps 12a, 12b of
the clamp device 12 are furthermore provided with meshing gears 12c on one side of
the clamp device 12, which is in a position beside the rove 13. The meshing gears
12c provide a combined movement of the clamps 12a, 12b and the activating lever 12d
and the release lever 12e, which will be described in more detail with regard to the
following figures. During normal operation of the spinning apparatus, the forward
and backward movement of the release lever 9 (cf. arrow B in Figs. 2 and 3) is realized
such that the engagement portion 12f of the clamp device 12 remains in any situation
within the longitudinal release groove 9a of the release lever 9, so that the clamp
device 12 is held in its open position shown in Figs. 1, 2 and 3.
[0021] The elements and components of the stopping device 10 according to this embodiment
are provided with screwless mounting means 5, 6 in order to be easily replaced in
case of damage. The screwless mounting means 5, 6 are, for example, formed as clip-on
elements, which may be mounted on mounting pins by means of a clipping action. Furthermore,
in this embodiment of the invention, the sensing lever 7, the release lever 9 and
the rocking cam 15 are mounted on a common support element 19. The complete stopping
device with the sensing lever 7, the rocking cam 15 and the clamp device 12 may therefore
easily be installed in existing spinning apparatuses as a so-called retrofit device.
The components and parts of the stopping device 10 are preferably made of a resin
material, such as plastic, so that the device 10 may also be used in corrosion-aggressive
environments, such as wet spinning apparatuses. The material of the components of
the stopping device is chosen such that they are resistant to temperatures of up to
80° C. The stopping device according to the invention is therefore resistant to water,
oil and normal chemicals. Furthermore, the rather simple construction of the mechanical
parts of the stopping device 10 does not require lubrication or maintenance activities.
The clamp device 12 is provided with a preloading spring, which is preferably mounted
within one or both of the clamps 12a, 12b, so that the spring is not exposed to the
sometimes wet surroundings and may be made of metal. The preloading spring is installed
in the clamp device 12 such that, upon release of the engagement part 12f of the clamp
device from the release groove 9a, the clamps 12a, 12b will automatically be brought
into a closed position, which is shown in Fig. 5, which will be described later.
[0022] With reference to Figs. 4 and 5, the functioning of the stopping device 10 according
to the invention and according to the shown embodiment is explained in a situation,
in which the yam 11 is broken. When a yarn break occurs, the sensing pin 8 on the
free end of the sensing lever 7 is moved beyond the point where normally the yam 11
passes by, which is in Fig. 4 indicated by arrows C. Due to the gravity and the balance
weight 17, the sensing lever 7 together with its release lever 9 moves around the
pivot axis X further than the normal position compared to the case where the yarn
11 is not broken. The release lever 9 has a release part 9a, here in the form of a
longitudinal groove, which is dimensioned such that the engagement portion 12f of
the activating lever 12d of the clamp device will leave the engagement with the release
lever 9 (cf. Fig. 5). The preloaded clamp device 12 will then automatically be closed
due to the force of a preloading spring, which is provided within the clamp device
12 neither on one clamp or on both clamps 12a, 12b. The closing of clamps 12a, 12b
is indicated in Fig. 5 by arrows D. Since meshing gears 12c are here provided besides
the rotational clamps 12a, 12b of the clamp device 12, the movement of the eccentric
clamps 12a, 12b is combined and counter-acting, which means that the two clamps 12a,
12b rotate in opposite directions, so that the cam surfaces of the eccentric clamps
12a, 12b comes into contact with one another as well as with the rove 13 to firmly
hold the rove 13 and to prevent a further delivery in the feed or delivery direction
F.
[0023] Because of the further rotational movement of in particular back rollers 1, 2 and
front rollers 3, 4, an increasing tension is applied onto the rove 13 and the broken
end of the yam 11 (cf. arrows F in Fig. 4). The increasing tension applied onto the
rove 13, which is firmly held outside of the drafting zone A and in a distance from
the back rollers 1, 2 by the clamp device 12, will lead to an increase in the clamping
effect of both eccentric clamps 12a, 12b. As a result, the rove 13 will break in a
position between the back rollers 1, 2 and the clamp device 12, as shown in Fig. 5.
A further delivery of rove 13 into the critical drafting zone A is then prevented.
Until the operator has reinstalled the rove in the drafting zone A, the end of the
broken rove 13 is firmly held by means of the clamps 12a, 12b of the clamp device.
In this example the two counter-acting clamps 12a, 12b have an eccentric protruding
part with a curved surface of approximately a quarter of a circle.
[0024] In this last situation as shown in Fig. 5, the continued rotation of the rocking
cam 15 is absorbed by the leaf-spring-type element 16, so that any damage of the sensing
lever or other parts is prevented. In case a part or component of the stopping device
10 will nevertheless be damaged, an easy repair is possible due to the screwless mounting
means 5, 6, with which the sensing lever 7 and/or the rocking cam 15 are installed
on the basic support frame of the spinning apparatus. In one embodiment of the invention
also the clamp device 12 is provided with screwless mounting means (not shown in the
figures). Such screwless mounting means 5, 6 as used in the embodiment may have the
form of U-shaped clip elements made of a resilient plastic material.
[0025] In order to restart the operation of this spinning position in a row of a large number
of spinning positions in a spinning apparatus (cf. Fig. 1), the operator has to grip
the end of the rove 13 and push the activating lever 12d with a kind of gripping part
downwards (cf. Fig. 5), so that the clamps 12a, 12b will open again and the activating
lever 12d will move with its engagement portion 12f also downwards to a position as
shown in Figs. 1 to 4 close to the release part 9a due to the meshing gears 12c. The
end portion of the release lever 9 beyond the release part 9a is provided with an
inclined surface of around 45° compared to the longitudinal axis of the lever 9 or
the release groove 9a. This leads to nose-like shape of the end of the release lever
9. The engagement portion 12f can easily be introduced into the groove-like engagement
portion 9a, and the end of the rove 13 may be connected to the already drafted yarn
11 on the output side of the drafting zone. After this simple operation with only
a manual actuation of two parts of the stopping device 10 according to the invention,
the spinning apparatus is in order again, and the production of yam may be continued.
The handling of the stopping device 10 is rather simple and very reliable. The reduced
number of only mechanical components of the stopping device 10 is a further advantage.
Because of the especially adapted L-shaped design of the sensing lever 7 and the release
lever 9 of the stopping device 10, the stopping device 10 can be mounted completely
outside of the drafting zone A from behind of the spinning apparatus and with the
sensing pin 8 on the output side of the drafting zone, whereas the clamp device 12
is positioned in a distance from the back rollers 1, 2, so that in any situation the
further supply of rove 13 into the drafting zone A is effectively prevented. The clamp
device is according to one further aspect of the invention located in distance of
15 to 12 cm from the back rollers 1, 2. Any interference with critical parts in the
drafting zone A is hereby prevented.
[0026] The invention is not limited to the embodiments described and shown in detail here.
The stopping device 10 may have a different type of clamp device 12. For example,
a clamp device 12 could have only one eccentric clamp, which has a fixed counter-element,
which provides the same function of an increased clamping force due to the further
pull from the side of the drafting area A due to the continued rotation of the rollers
1, 2, 3, 4. Also, the construction and form of the sensing lever 7 with the release
lever 9 and the release part 9a can be modified within the scope of the invention
as defined in independent following claim 1: the lever 7, 9 is not necessarily provided
in an approximately L-shaped form. The release part 9a can be an open surface instead
of a groove-like element. The balance weight 17 with the weight adjustment positions
14 can be eliminated provided that the form and position of the pivot axis X are chosen
in such a manner that the repeated pushing of the sensing pin 8 can be accomplished.
Also, the form of the rocking cam 15 can be different as long as the repeated rocking
movement of the sensing lever 7 is realized.
1. Device (10) for stopping a rove supply in a spinning or twisting apparatus after breakage
of a yam (11) at the output side of a drafting zone (A) which comprises at least a
pair of front rollers (3, 4) and a pair of back rollers (1, 2), whereby the rove (13)
is delivered in normal operation by a pair of feed rollers from the input side and
is formed to said yarn (11) in the drafting zone (A) and whereby the rove delivery
is stopped upon breakage of the yarn (11), the stopping device (10) comprises a mechanical
sensing lever (7) with a sensing pin (8) being repeatedly in contact with said yarn
(11) and said sensing lever (7) is pivotally mounted on a pivot axis (X), characterized in that said sensing lever (7) has a release lever (9) opposite to said sensing lever (7)
which is provided with a longitudinal release part (9a) being in engagement with a
spring-loaded clamp device (12) such that in normal operation of the apparatus said
clamp device (12) is open and closes after the break of the yam (11) through the conjoint
pivot movement of said sensing lever (7) and said release lever (9) about said pivot
axis (X) to firmly clamp the rove (13) at the input side of said drafting zone (A)
before said back rollers (1, 2), and that said clamp device (12) comprises two opposite
counter-acting excentric clamps (12a, 12b) which are pivotally mounted on both sides
of the rove (13) such that a pulling force of said yam (11) will automatically increase
the clamp effect of said clamp device (12).
2. Device (10) according to claim 1, characterized in that said sensing lever (7) and said release lever (9) have an essentially L-shaped integral
form and that said sensing pin (8) is provided as a separate and exchangeable element.
3. Device (10) according to claim 1 or 2, characterized in that said clamp device (12) has a preloading spring for an automatic closing of the clamps
upon release through said release part (9a) of said release lever (9).
4. Device (10) according to any one of the preceding claims, characterized in that said sensing lever (7) is pivotally mounted on a common support element with said
pivot axis (X) and a rocking cam (15) being directly or indirectly driven by said
back rollers (1, 2) such that said sensing lever (7) is repeatedly moved against said
yam (11).
5. Device (10) according to claim 4, characterized in that said sensing lever (7) and/or said release lever (9) is provided with a leaf spring
element (16) on the inside region coming into contact with said rocking cam (15).
6. Device (10) according to any one of 1-3 claims, characterized in that a rocking cam (15) for driving the sensing lever (7) is provided with a rocking shaft
(18) being synchronized with the rotational speed of rollers (1, 2) of the drafting
zone.
7. Device (10) according to any one of the preceding claims, characterized in that said pivot axis (X) is arranged at a predetermined balanced position of said sensing
lever (7) such that said sensing pin (8) is repeatedly pushed against said yam (11)
with a predetermined force.
8. Device (10) according to any one of the preceding claims, characterized in that said sensing lever (7) is provided with at least one movable balance weight (17)
for adjustment of the pressure or force applied by said sensing pin (8) on said yarn
(11).
9. Device (10) according to any one of the preceding claims, characterized in that said clamp device (12) has an activating lever (12d) with an engagement portion (12f)
for engagement with said release part (9a) and a release lever (12e) for returning
said clamp device (12) from its closed position back in its open position.
10. Device (10) according to any one of the preceding claim, characterized in that said release part (9a) is provided in form of a longitudinal groove at the end of
said release lever (9) which is open to one side.
11. Device (10) according to any one of 4-6 claims, characterized in that said sensing lever (7) and/or said rocking cam (15) and/or said clamp device (12)
are provided with screwless-type mounting means, in particular in the form of clip-type
mounting means (5, 6).
12. Use of a device (10) according to any one of the preceding claims, characterized in that said stopping device (10) is designed as a retrofit device which may be mounted on
existing spinning apparatuses.
1. Vorrichtung (10) zum Stoppen einer Vorgarnzufuhr in einer Spinnvorrichtung oder einer
Zwirnvorrichtung nach einem Bruch eines Garns (11) an der Ausgangsseite einer Streckzone
(A), welche mindestens ein Paar von vorderen Walzen (3, 4) und ein Paar von hinteren
Walzen (1, 2) umfasst, wobei das Vorgarn (13) im normalen Betrieb durch ein Paar von
Zuführwalzen von der Eingangsseite her befördert wird und in der Streckzone (A) zu
dem Garn (11) geformt wird und wobei die Beförderung des Vorgarns nach einem Bruch
des Garns (11) gestoppt wird, wobei die Stoppvorrichtung (10) einen mechanischen Abtasthebel
(7) mit einem Abtaststift (8) umfasst, welcher wiederholt mit dem Garn (11) in Kontakt
steht, und der Abtasthebel (7) schwenkbar an einer Schwenkachse (X) montiert ist,
dadurch gekennzeichnet, dass der Abtasthebel (7) einen Freigabehebel (9) gegenüberliegend zu dem Abtasthebel (7)
aufweist, welcher mit einem longitudinalen Freigabeteil (9a) versehen ist, das mit
einer federbelasteten Klemmeinrichtung (12) derart in Eingriff steht, dass beim normalen
Betrieb der Vorrichtung die Klemmeinrichtung (12) offen ist und nach dem Bruch des
Garns (11) durch die gemeinsame Schwenkbewegung des Abtasthebels (7) und des Freigabehebels
(9) um die Schwenkachse (X) schließt, um das Vorgarn (13) an der Eingangsseite der
Streckzone (A) vor den hinteren Walzen (1, 2) fest zu klemmen, und dass die Klemmeinrichtung
(12) zwei gegenüberliegende, entgegenwirkende exzentrische Klemmen (12a, 12b) umfasst,
welche schwenkbar an beiden Seiten des Vorgarns (13) derart montiert sind, dass eine
Zugkraft des Garns (11) automatisch die Klemmwirkung der Klemmeinrichtung (12) erhöhen
wird.
2. Vorrichtung (10) nach Anspruch 1, dadurch gekennzeichnet, dass der Abtasthebel (7) und der Freigabehebel (9) eine im Wesentlichen L-förmige, einstückige
Form aufweisen und dass der Abtaststift (8) als ein separates und austauschbares Element
vorgesehen ist.
3. Vorrichtung (10) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Klemmeinrichtung (12) eine Vorspannungsfeder zum automatischen Schließen der
Klemmen auf die Freigabe durch den Freigabeteil (9a) des Freigabehebels (9) hin aufweist.
4. Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abtasthebel (7) schwenkbar an einem gemeinsamen Halteelement mit der Schwenkachse
(X) und einem Schaukelnocken (15), welcher direkt oder indirekt durch die hinteren
Walzen (1, 2) angetrieben wird, derart montiert ist, dass der Abtasthebel (7) wiederholt
gegen das Garn (11) bewegt wird.
5. Vorrichtung (10) nach Anspruch 4, dadurch gekennzeichnet, dass der Abtasthebel (7) und/oder der Freigabehebel (9) mit einem Blattfederelement (16)
an dem inneren Bereich versehen ist, welcher mit dem Schaukelnocken (15) in Kontakt
gelangt.
6. Vorrichtung (10) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass ein Schaukelnocken (15) zum Antreiben des Abtasthebels (7) mit einer Schaukelwelle
(18) versehen ist, welche mit der Drehzahl der Walzen (1, 2) der Streckzone synchronisiert
ist.
7. Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schwenkachse (X) an einer vorherbestimmten, ausbalancierten Position des Abtasthebels
(7) derart angeordnet ist, dass der Abtaststift (8) mit einer vorherbestimmten Kraft
wiederholt gegen das Garn (11) gestoßen wird.
8. Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abtasthebel (7) mit mindestens einem bewegbaren Ausgleichsgewicht (17) für eine
Einstellung des Drucks oder der Kraft versehen ist, welche durch den Abtaststift (8)
auf das Garn (11) angelegt wird.
9. Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Klemmeinrichtung (12) einen Aktivierungshebel (12d) mit einem Eingriffsabschnitt
(12f) zum Eingriff mit dem Freigabeteil (9a) und einen Freigabehebel (12e) zum Zurückbringen
der Klemmeinrichtung (12) von ihrer geschlossenen Position in ihre offene Position
aufweist.
10. Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Freigabeteil (9a) in Form einer longitudinalen Nut an dem Ende des Freigabehebels
(9) vorgesehen ist, welche zu einer Seite hin offen ist.
11. Vorrichtung (10) nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass der Abtasthebel (7) und/oder der Schaukelnocken (15) und/oder die Klemmeinrichtung
(12) mit Montagemitteln vom schraubenlosen Typ versehen sind, insbesondere in der
Form von Montagemitteln (5, 6) vom Cliptyp.
12. Verwendung einer Vorrichtung (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stoppvorrichtung (10) als eine Nachrüstungseinrichtung konstruiert ist, welche
an bestehende Spinnvorrichtungen montiert werden kann.
1. Dispositif (10) d'arrêt d'approvisionnement de mèche dans un dispositif de filature
ou dispositif à retordre après la casse d'un fil (11) au côté de sortie d'une zone
d'étirement (A), comprenant au moins une paire de rouleaux avant (3, 4) et une paire
de rouleaux arrière (1, 2), la mèche (13) étant approvisionnée en opération normale
du côté d'entrée par une paire de rouleaux d'alimentation et étant formée en fil (11)
dans la zone d'étirement (A), et l'approvisionnement de la mèche étant arrêté lors
d'une casse du fil (11), le dispositif d'arrêt (10) comprenant un levier d'exploration
(7) mécanique avec une cheville d'exploration (8) étant de façon répétée en contact
avec le fil (11), et le levier d'exploration (7) étant monté de façon pivotante sur
un axe de pivotement (X), caractérisé en ce que le levier d'exploration (7) présente un levier de libération (9) opposé au levier
d'exploration (7), qui est prévu avec une pièce de libération (9a) longitudinale étant
engrenée avec un dispositif de serrage (12) qui est sous la contrainte d'un ressort
de telle manière qu'en opération normale du dispositif le dispositif de serrage (12)
est ouvert et se ferme après la casse du fil (11) par le mouvement de pivotement conjoint
du levier d'exploration (7) et du levier de libération (9) autour de l'axe de pivotement
(X) pour serrer fermement la mèche (13) au côté d'entrée de la zone d'étirement (A)
avant les rouleaux arrières (1, 2), et en ce que le dispositif de serrage (12) comprend deux bornes (12a, 12b) excentriques à effet
opposé, qui sont montées de façon pivotante sur les deux côtés de la mèche (13) de
sorte qu'une force de traction du fil (11) va augmenter automatiquement l'effet de
serrage du dispositif de serrage (12).
2. Dispositif (10) selon la revendication 1, caractérisé en ce que le levier d'exploration (7) et le levier de libération (9) présentent essentiellement
une forme en L d'un seul tenant, et en ce que la cheville d'exploration (8) est prévue comme un élément séparé et remplaçable.
3. Dispositif (10) selon la revendication 1 ou 2, caractérisé en ce que le dispositif de serrage (12) présente un ressort de tension préalable pour une fermeture
automatique des bornes lors d'une libération par la pièce de libération (9a) du levier
de libération (9).
4. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce que le levier d'exploration (7) est monté de façon pivotante sur un élément de support
commun avec l'axe de pivotement (X) et une came de balançoire (15) étant entraînée
de façon directe ou indirecte par les rouleaux arrières (1, 2) de sorte que le levier
d'exploration (7) est déplacé de façon répétée contre le fil (11).
5. Dispositif (10) selon la revendication 4, caractérisé en ce que le levier d'exploration (7) et/ou le levier de libération (9) est prévu avec un élément
de ressort à lames (16) à la région interne, laquelle vient en contact avec la came
de balançoire (15).
6. Dispositif (10) selon l'une des revendications 1 à 3, caractérisé en ce qu'une came de balançoire (15) pour entraîner le levier d'exploration (7) est prévue
avec un pivot de balançoire (18) étant synchronisé avec la vitesse des rouleaux (1,
2) de la zone d'étirement.
7. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce que l'axe de pivotement (X) est disposé à une position prédéterminée et équilibrée du
levier d'exploration (7) de sorte que la cheville d'exploration (8) est poussée de
façon répétée contre le fil (11) avec une force prédéterminée.
8. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce que le levier d'exploration (7) est prévu avec au moins un poids d'équilibre (17) mobile
pour le réglage de la pression ou la force, laquelle est appliquée par la cheville
d'exploration (8) sur le fil (11).
9. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce que le dispositif de serrage (12) présente un levier d'activation (12d) avec une partie
d'engrènement (12f) pour l'engrènement avec cette partie de libération (9a) et un
levier de libération (12e) pour ramener le dispositif de serrage (12) de sa position
fermée à sa position ouverte.
10. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce que la partie de libération (9a) est prévue en forme d'une rainure longitudinale à l'extrémité
du levier de libération (9), laquelle est ouverte à un côté.
11. Dispositif (10) selon l'une des revendications 4 à 6, caractérisé en ce que le levier d'exploration (7) et/ou la came de balançoire (15) et/ou le dispositif
de serrage (12) sont prévus avec des moyens de montage du type sans vis, en particulier
en forme des moyens de montage (5, 6) du type clip.
12. Utilisation d'un dispositif (10) selon l'une des revendications précédentes, caractérisée en ce que le dispositif d'arrêt (10) est construit comme un dispositif d'équipement complémentaire,
qui peut être monté à des dispositifs de filature existants.