Shed-forming device for a weaving machine.
[0001] The invention relates to a shed-forming device
for a weaving machine comprising a number of drive
levers and a number of transmission mechanisms, in
which each transmission mechanism can drive a heald
frame and can be driven by a driving device via a drive
lever. The invention also relates to a method for
producing such a shed-forming device and a method for
using such a shed-forming device.
[0002] In weaving machines, a shed-forming device
serves to form planes of warp threads between which a
shed is formed in order to allow weft threads to be
introduced into the shed. A known shed-forming device
usually drives at least two heald frames and comprises
a transmission mechanism for each heald frame in order
to move the heald frame up and down and a drive lever
driven by a driving device for driving the transmission
mechanism for the heald frame. A transmission mechanism
is generally driven by means of a driving device, such
as a dobby, a cam box, an eccenter mechanism or any
other driving device.
[0003] Such a driving device as described in
EP 0 742 298 A2 drives several drive levers, typically
each heald frame is associated with one drive lever.
For each heald frame, the transmission mechanism in
this case comprises a rod which is connected to a drive
lever, a first hinge lever, a horizontal rod, a second
hinge lever and two vertical rods for the transmission
of the to-and-fro rotary movement of an associated
hinge lever to an up and down movement of the heald
frame. EP 1 613 800 B l describes a transmission
mechanism having three hinge levers and three vertical
rods .
[0004] The movements of all heald frames together
determine the shape of the shed. The movements, in
particular the amplitudes of the movements of the heald
frames, are dependent on different parameters, such as,
inter alia, the length of the rods and/or the hinge
levers of the transmission mechanism, the course of
movement of the drive levers and/or the coupling
position of the transmission mechanism and the drive
lever. A desired amplitude of the movement of a heald
frame can be chosen depending on different parameters,
such as the material of the fabric to be woven, the
number of heald frames which has been used, the desired
weaving pattern, the weaving speed, the type of heald
frame and/or the type of transmission mechanism.
[0005] One possibility for adjusting the amplitude of
the movement of a heald frame is to adjust the course
of movement of the drive lever driven by the driving
device. Depending on the type of driving device,
methods and devices are known for changing the course
of movement of the drive levers. However, in general,
the course of movement cannot be changed without
demounting the driving device.
[0006] Another possibility for adjusting the amplitude
of the movement of a heald frame is to adjust the
length of the hinge levers and/or of the rods of a
transmission mechanism and/or to change the position of
mutual connection points of the hinge levers and/or of
the rods. In practice, the transmission mechanism is
chosen during assembly of the weaving machine and is
not subsequently altered any more.
[0007] In general, a transmission mechanism is coupled
to a drive lever driven by the driving device by means
of a connection which is set to a coupling position. A
settable connection makes it possible to move the
coupling position in which the transmission mechanism
is coupled to the associated drive lever for an
adjustment of the amplitude. If several heald frames
have to be moved, the desired coupling positions can be
set differently for different heald frames. In
practice, once the weaving machine has been assembled,
the setting of the amplitude of the movement of a heald
frame of a weaving machine is only carried out by
adjusting the coupling positions of the settable
connections .
[0008] In practice, tables are available in which
reference coupling positions are defined for the
settable connections between the transmission mechanism
and the drive levers for a desired setting of the shed,
as a function of the type of driving device and/or of
the design of the transmission mechanism. A reference
coupling position can, for example, be given by giving
the distance of this reference coupling position from
the end of a drive lever.
[0009] In order to adjust the coupling position
according to these tables, it is known to use a ruler
for setting the different coupling positions to an
associated reference coupling position. In addition,
JP 64-22789 discloses that a scale is provided on the
drive levers in order to facilitate an adjustment.
However, the adjustment of the coupling positions still
requires, among other things, knowledge of the type of
driving device, of the design of the transmission
mechanism and the use of an associated table for
determining the desired coupling position.
[0010] It is an object of the invention to facilitate
the setting of a coupling position in such a manner
that no knowledge of the driving device, no knowledge
of the design of the transmission mechanism and/or no
use of a table is required. It is further an object to
provide a shed-forming device in which the setting of a
coupling position is facilitated.
[0011] The object of the invention is achieved by a
shed-forming device wherein the transmission mechanism
and the drive lever are coupled in a specific coupling
position by means of a connection, and wherein at least
one indication for a reference coupling position is
provided on the drive lever.
[0012] The invention makes it possible to provide an
indication on the drive lever associated with a
reference coupling position with a specific driving
device, a specific transmission mechanism and a
specific drive lever. The invention also makes it
possible to provide a number of indications on the
drive lever which are associated with a number of
reference coupling positions. The at least one
indication for a reference coupling position can be
selected on the basis of, for example, a table for a
specific weaving configuration and/or for a desired
setting of the shed. Providing an indication for a
reference coupling position on a drive lever which is
arranged between the transmission mechanism and the
driving device, can be carried out particularly
advantageously during assembly of the weaving machine,
so that an operator of the weaving machine in a weaving
room without knowledge of the driving device and/or
without knowledge of the transmission mechanism can use
the indication for a reference coupling position in
order to set the connection to a specific coupling
position .
[0013] According to a preferred embodiment, an
indication for a reference coupling position is
provided on a number of predetermined drive levers on a
weaving machine with a shed-forming device for a number
of heald frames, each of which is driven via a
transmission mechanism by a driving device. According
to an advantageous embodiment, each drive lever is
provided with an indication for a reference coupling
position .
[0014] According to an embodiment, the driving device
also comprises the drive levers, more particularly, the
drive levers are integrated into the driving device.
According to another embodiment, the transmission
mechanism also comprises the drive levers, more
particularly the drive levers are integrated into the
transmission mechanism. The driving device may consist
of a dobby, a cam box, an eccenter mechanism or any
other driving device. EP 1 613 800 B l describes
different variant driving devices.
[0015] In general, the desired amplitude of the
movement of a heald frame increases with the distance
of the respective heald frame from the beat-up line,
for example increases linearly. If the reference
coupling positions for adjacent drive levers are
identical, an indication of the position of a reference
coupling position on one drive lever may suffice to
adjust the coupling positions of successive heald
frames. Also if the reference coupling positions for
adjacent drive levers are related to each other in a
simple way, for example related linearly, one
indication of a reference coupling position may
suffice. In the latter case, a first indication for a
reference coupling position may be provided on a first
drive lever, while a second indication for a reference
coupling position is provided on a second drive lever,
while for the drive levers which are situated between
the first and second drive lever, coupling positions
can be set which are linearly related to the first and
second indications for a reference coupling position.
[0016] According to a preferred embodiment, at least
one indication for a reference coupling position is
provided on each of at least two drive levers which are
arranged next to one another. This is particularly
advantageous if these reference coupling positions are
not related to one another.
[0017] With transmission mechanisms for moving
associated heald frames, it is possible to use hinge
levers which differ from one another and which impose a
corresponding movement to the associated heald frames.
In particular, both a first and a second hinge lever
may be designed differently for the movement of the
associated heald frames. Because of this, a linear
relationship between the desired amplitudes of the
movements of successive heald frames does not result in
a linear relationship between the settings of
successive coupling positions of the connections.
[0018] The movements of the drive levers which are
driven by the driving device can also be adjusted
differently for the movement of different heald frames.
For example, the amplitude of the movement, more
particularly the rotary movement of a first number of
drive levers which are connected to heald frames in a
position closer to the beat-up line, can be set to be
smaller than the movement, more particularly the rotary
movement, of a subsequent number of drive levers which
are connected to the heald frames in a position further
from the beat-up line. This may also lead to a non
linear relationship between the desired amplitudes of
the movements of successive heald frames and the
corresponding settings of successive coupling positions
of the connection by means of which associated driving
mechanisms and drive levers are connected to one
another .
[0019] In particular if the relationship between the
amplitudes of the movements of successive heald frames
and the respective successive coupling positions is not
linear, an adjustment of the coupling positions is
difficult, since the operator who carries out the
adjustment may not be familiar with the specifics of
the transmission mechanism and/or of the driving
device. In practice, one or more steps in the
succession of coupling positions can often be
identified, which is to say that for different groups
of drive levers successive coupling positions can be
distinguished, wherein the coupling positions follow
one another according to a more or less similar
relationship within each group of drive levers, while
this does not apply to successive coupling positions
associated with different groups of drive levers. This
results in what is referred to as a step between these
successive coupling positions of different groups of
drive levers. With a step, the difference in position
between successive coupling positions can be distinctly
different from the difference in position between
successive coupling positions where no step occurs.
Incorrectly setting the connection in a coupling
position at a step can therefore result in a greatly
deformed shed, which may cause both weaving faults and
warp thread breakages. The invention is particularly
advantageous if such a step is present, as, with a
step, the reference coupling positions for drive levers
arranged adjacent to each other are not related to one
another .
[0020] By providing indications for reference coupling
positions according to the invention which are
perceptible, for example visually perceptible, setting
or adjusting a coupling position is facilitated and the
operator who carries out the setting or adjustments
will always be aware of the presence and the location
of a step.
[0021] According to an embodiment, a single set of
perceptible indications is provided which indicate
reference coupling positions for a standard setting of
the shed, that is to say a setting which is usually
used with a specific weaving configuration, for example
a weaving configuration which is associated with a
certain type of fabric to be woven and a certain type
of weaving machine, for example an air jet weaving
machine or a gripper weaving machine. In another
embodiment, the set of indications indicates an
"average" setting for the shed, which means a setting
of which deviations to a certain extent are tolerated,
for example from weaving machine to weaving machine.
With yet another embodiment, the set of indications
indicates unusual or special settings for the shed,
such as an elliptical setting for the shed.
[0022] According to another embodiment, perceptible
indications for at least a first and a second reference
coupling position are provided on the at least one
drive lever. These at least first and second
indications may indicate reference coupling positions
for at least one first and one second limit position
for the shed between which an operator may set the
adjustable coupling position.
[0023] According to another preferred embodiment, a
number of perceptible indications with different
characteristics are provided on the at least one drive
lever which indicate at least a first and second
reference coupling position. More particularly,
preferably at least a first and a second set of
visually perceptible indications with different
characteristics are provided on the respective drive
levers. According to an embodiment, the different
characteristics comprise for example different shapes
and/or different colours and/or different symbols. An
indication may consist of a single part, for example a
line, a groove or the like. The indication may also
consist of several parts, for example two or more
lines, grooves or the like which are applied parallel
to one another and at a small distance from one
another .
[0024] According to another embodiment, the
indication, the set of indications or the number of
sets of indications is provided permanently on the at
least one drive lever. According to preferred
embodiments, the indications are printed, engraved, cut
or provided on the drive levers in different manners.
The indications facilitate adjustment of the coupling
positions and make it readily possible to set the
coupling positions correctly.
[0025] The object of the invention is also achieved by
a method for producing a shed-forming device wherein
the transmission mechanism and the drive lever may be
coupled in a certain coupling position by means of a
connection, and wherein at least one indication for a
reference coupling position is applied to at least one
drive lever.
[0026] According to an embodiment, at least one
indication for at least one reference coupling position
is applied to at least two drive levers. In addition,
at least one indication for at least one reference
coupling position may be provided on a number of drive
levers or at least one indication for at least one
reference coupling position may be provided on each
drive lever.
[0027] According to an embodiment, permanent
indications are applied to drive levers during assembly
of the drive levers. According to another embodiment,
indications are applied during the assembly of the
weaving machine, during installation of the weaving
machine in a weaving mill and/or just before weaving
with a desired weaving configuration.
[0028] In particular, if a desired setting of the shed
is to be set which is not a standard setting, a nonpermanent
indication, for example using paint or
adhesives, may be preferred.
[0029] Also a template can be used for applying at
least one perceptible indication for a reference
coupling position to at least one drive lever which
makes it possible to drive a transmission mechanism
using a driving device for a weaving machine. The
template may be used to provide permanent as well as
temporary indications.
[0030] According to an embodiment, a template is used
to provide at least one perceptible indication on the
at least one drive lever. A template is individualized
for a certain weaving configuration and for a certain
setting of the shed on a certain shed-forming device.
Using a template allows an operator to select, for
example, a setting which is used frequently and to
provide this on a weaving machine. According to an
embodiment, the template serves as a guide for applying
indications in writing, using paint, grooves, adhesives
or other means, to the drive levers. According to
another embodiment, the template is used as a temporary
indication, for example if a rarely used pattern has to
be set or in an assembly line for weaving machines. The
template may be provided, for example, above the first
drive lever while an indication is being provided at
subsequent drive levers by means of the template.
[0031] The object of the invention is achieved by a
method for setting a shed-forming device for a weaving
machine, wherein the shed-forming device comprises a
number of drive levers and a number of transmission
mechanisms, wherein each transmission mechanism can
drive a heald frame and can be driven by a driving
device via a drive lever, wherein the transmission
mechanism and the drive lever are coupled in a specific
coupling position by means of a connection, and wherein
the coupling position between the transmission
mechanism and the drive lever is set as a function of
an indication for a reference coupling position which
is provided on the drive lever.
[0032] In the following, embodiments of the invention
will be described in more detail with reference to the
following schematic drawings, the same reference
numerals being used throughout the figures to indicate
identical or similar parts.
Fig. 1 is a diagrammatic illustration in perspective
of a shed-forming device according to the
invention,
Fig. 2 is a diagrammatic illustration of a cross
section, viewed in accordance with arrow A in
Fig. 1 ,
Fig. 3 is a diagrammatic illustration of a view of the
drive levers from Fig. 2 in accordance with
arrow B ,
Fig. 4 is a diagrammatic illustration, similar to
Fig. 2 , of different connections,
Fig. 5 is a diagrammatic illustration, similar to
Fig. 3 , of the drive levers from Fig. 4 with a
number of connections,
Fig. 6 is a diagrammatic illustration of the drive
levers from Fig. 5 ,
Fig. 7 is a diagrammatic illustration of a variant of
Fig. 6 of drive levers provided with
indications,
Fig. 8 is a diagrammatic illustration of a variant of
Fig. 6 of drive levers provided with
indications ,
Fig. 9 is a diagrammatic illustration of a variant of
Fig. 6 of drive levers provided with
indications ,
Fig. 10 is a diagrammatic illustration of a variant of
Fig. 6 in which a template has been placed
above the drive levers,
Fig. 11 is a diagrammatic illustration similar to
Fig. 3 in which a template has been placed
above the drive levers,
Fig. 12 is a diagrammatic illustration of a view of a
shed-forming device according to the invention,
Fig. 13 is a diagrammatic illustration of a variant
from Fig. 12, and
Fig. 14 is a diagrammatic illustration of drive levers
in accordance with arrow C in Fig. 12.
[0033] Fig. 1 diagrammat ically shows a perspective
view of an embodiment of a shed-forming device 1 with a
number of transmission mechanisms 2 , each of which is
connected to a heald frame 3 . In general, weaving is
carried out with at least two different heald frames 3 ,
each of which is driven via an associated transmission
mechanism 2 . For the sake of clarity of the
illustration, only two heald frames 3 are illustrated.
The shed-forming device 1 also comprises different
drive levers 4 which are coupled to a rod 6 of the
transmission mechanism 2 via an settable connection 5 .
A transmission mechanism 2 furthermore comprises a
first hinge lever 7 , a horizontal rod 8 , a second hinge
lever 9 and vertical rods 10 and 11. The transmission
mechanism serves to convert a to-and-fro movement of
the coupled drive lever 4 into an up-and-down movement
of the heald frame 3 . In this case, the heald frame 3
can move in the guides 12 and 13 of a weaving machine,
which is not illustrated. Furthermore, a driving device
14 is illustrated which drives the drive levers 4 . With
a number of heald frames 3 a shed 47 is formed between
two planes of warp threads 48 and 49, in which case the
planes of warp threads 48 and 4 9 blend into a fabric 51
at a beat-up line 50.
[0034] In Fig. 2 , the connection 5 , the rod 6 and the
drive lever 4 coupled thereto are illustrated in more
detail. The cross section of the driving device 14
shows an embodiment for driving the drive levers 4 . The
driving device 14 comprises a drive shaft 15, which is
driven, for example, directly or indirectly by a drive
motor (not shown) , an eccenter 16 that is driven by the
drive shaft 15 and a drive rod 17 which is moved to and
fro by the eccenter 16. The drive rod 17 drives the
drive lever 4 via a shaft 18, the drive lever 4 being
arranged so as to be rotatable about a shaft 19. The
driving device 14 can, of course, also be designed as a
dobby, for example as a dobby as known from IPC class
"D03C 1", a cam box or another known drive which can be
used with a shed-forming device. In this case, the
drive levers 4 are integrated into the driving device
14, more particularly in the housing of the driving
device 14 .
[0035] The coupling position of the connection 5 on
the drive lever 4 can be shifted towards the end 2 0 of
the drive lever 4 or shifted away from the end 20 along
the drive lever 4 in order to set the amplitude of the
movement of the rod 6 , the connected hinge levers 7 and
9 , horizontal rod 8 , vertical rods 10 and 11 and the
heald frame 3 . The coupling position can be adjusted by
means of the settable connection 5 .
[0036] In practice, the distance D between the end 2 0
of the drive lever 4 and the adjustable connection 5 is
for example indicated by the number of millimetres in
order to give a coupling position for a certain weaving
configuration. The adjustable connection 5 comprises a
fixing element 2 1 by means of which the adjustable
connection 5 can be fixed on the drive lever 4 in a
certain coupling position. In this case, the coupling
position of the adjustable connection 5 is set on the
drive lever 4 .
[0037] Fig. 3 diagrammat ically shows the drive levers
4 and the adjustable connection 5 from Fig. 2 viewed in
accordance with arrow B from Fig. 2 . Fig. 3 also shows
a number of indications 22 which are provided on a
number of drive levers 4 . As can be seen, the various
indications 22 are linearly related. This can be used,
for example, if all drive levers 4 are of identical
design and are driven in the same manner, and if all
transmission mechanisms 2 are of identical design.
[0038] Figs. 4 and 5 show an illustration of an
embodiment, wherein a number of transmission mechanisms
2 is each driven by an associated drive lever 4 . The
various drive levers 4 are arranged next to one another
and are each coupled to a different rod 6 of a certain
transmission mechanism 2 for a heald frame 3 by means
of an associated adjustable connection 5 . The
connections 5 are attached to an associated drive lever
4 at different coupling positions, in other words are
positioned at a different distance D from the
associated end 20. The drive levers 4 are divided into
two groups 24 and 25. The differences in position
between adjacent coupling positions within each group
24 or 25 are rather limited, while the difference in
position between the adjacent coupling positions which
do not belong to the same group can be relatively
large .
[0039] As is illustrated in Fig. 6 , an indication 22
or 23 for a reference coupling position is provided on
each drive lever 4 . The differences in position H
between adjacent reference coupling positions within
groups 24 and 25 are rather limited. However, the
difference in position I between the adjacent reference
coupling positions of two drive levers 4 which are
arranged next to one another and which belong to a
different group 24 or 25, is relatively large. The
difference in position I between the reference coupling
positions of adjacent drive levers 4 with indications
22 or 23 is referred to as a step.
[0040] The step can, for example, be caused as a
result of the drive levers 4 of the one group 24 being
driven by a drive rod 17 at the shaft 18, while the
drive levers 4 of the other group 25 are driven by a
similar drive rod 17 at the shaft 26. In this case, the
shaft 2 6 is indicated in Fig. 2 and situated closer to
the shaft 19 than the shaft 18, so that, at the same
displacement of the drive rod 17, a drive lever 4 which
is driven at the shaft 2 6 is moved over a larger angle
than a drive lever 4 which is driven at the shaft 18.
The step may, for example, also or in addition be
caused by the fact that the first hinge levers 7
associated with the drive levers 4 of group 24 are
driven by the rods 6 at a shaft 52 and the first hinge
levers 7 which are associated with the drive levers 4
of group 25 are driven by rods 6 at a shaft 53. The
shafts 52 and 53 are illustrated in Fig. 1 . The
vertical levers 10 and 11 may, also or in addition, be
driven by the hinge levers 43 and 9 at the shafts 5 6
for the group 24 and at the shafts 45 for the group 25.
The shafts 5 6 and 45 are illustrated in Fig. 13.
[0041] Figs. 5 and 6 show connections 5 and
indications 22 and 23 for reference coupling positions
for a so-called elliptical setting of the shed, in
which the differences in positions H and I and the
positions of the connections 5 are chosen in such a
manner that a shed 47 assumes a rather elliptical
shape. This means that the amplitude of the movements
of the heald frames 3 which are situated closer to a
beat-up line 50 is chosen to be greater than in the
case of a conventional diamond-shaped setting of the
shed and that the amplitude of the movements of the
heald frames 3 which are situated further from a beatup
line 50 is chosen to be smaller than in the case of
a conventional diamond-shaped setting of the shed. With
a diamond-shaped setting of the shed, the amplitude of
the movements of successive heald frames 3 increases
linearly as a heald frame 3 is situated further away
from a beat-up line 50. Due to the elliptical setting,
the differences in pressure between warp threads which
are moved through various heald frames 3 are kept
rather limited, as a result of which a more even fabric
51, illustrated in Fig. 1 , can be produced. The use of
indications 22, 23 is particularly advantageous for
setting an elliptical shed.
[0042] In Fig. 7 , in a way similar to that of Fig. 5 ,
the drive levers 4 are provided with indications 22 and
27. With the group 24, the indications 22 are linearly
related, more specifically all differences in position
J are equal, while with the group 25, the indications
27 do not show any difference in position. In this
case, the difference in position K between two
indications 22 and 27 of two adjacent drive levers 4
forms a step. If a setting is selected for the shed
which comprises identical reference coupling positions
for different adjacent connections, as is the case for
the adjustable connections 27, it may be sufficient to
provide an indication 27 on only one of the associated
drive levers 4 for these reference coupling positions.
A connection 5 may, for example, be set to a reference
coupling position which is indicated by the indication
27 and subsequently the other connections can be set
identically to the connection which is associated with
the indication 27.
[0043] Fig. 8 shows drive levers 4 to which a visually
perceptible indication 22 for a reference coupling
position is applied. In this case, an indication 22 is
provided on the outer drive levers 4 . In addition, an
indication is applied to two adjacent drive levers 4
which are situated between the outer drive levers 4 .
When the reference coupling positions for example are
linearly related, it is sufficient to provide a limited
number of indications 22, while in this embodiment also
the location of the step and a difference in position
of reference positions at the step is indicated.
[0044] Fig. 9 shows drive levers 4 which are provided
with indications 22 which form a first set of
indications, and in which, in addition to the
indications 22, indications 2 8 are also applied to each
drive lever 4 which form a second set of indications. A
first set of indications 22 indicates, for example, the
reference coupling positions for a standard setting of
the shed 47 for the weaving machine of which the shedforming
device 1 forms part. If this setting is given
in a table, the indications 22 are for example in each
case placed at the distances of the ends 2 0 from the
drive levers 4 . The distances may be given in an
appropriate table, similar to the distance D from Fig.
2 . According to an embodiment, the second set of
indications 2 8 can indicate two reference coupling
positions for limit positions of the shed 47 between
which an operator can set the coupling positions of
correspondingly adjustable connections 5 .
[0045] In this case, the indications 22 and the
indications 2 8 have different optically perceptible
characteristics, for example, the indications 22 are in
the form of a dot and the indications 2 8 are in the
form of a dash. The colour of the indications 22 and 2 8
may also differ, for example. The indications 22 and 2 8
can be applied to the drive levers 4 by means of
notching, etching, writing, painting or by using
adhesives or the like.
[0046] Figs. 10 and 11 are similar to Figs. 5 and 4 ,
respectively, and show an embodiment of the drive
levers 4 of a driving device 2 , to which adjustable
connections 5 are attached. A template 2 9 according to
the invention is placed on the drive levers 4 and is
formed so, for example, that inner sides 30 and 31 of
the template 2 9 can bear against the drive levers 4 in
such a way that the template 29, when repeatedly taken
away and placed back on the drive levers 4 , always
easily can be placed back in the same position for
setting the shed, preferably exclusively in one
specific position for setting the shed. According to an
embodiment, the template 2 9 is provided with a profiled
section 32 which makes it possible to indicate
reference coupling positions on the drive levers 4 in
an unambiguous manner. According to a preferred
embodiment, the profiled section 32 is also designed as
a profiled edge against which the adjustable
connections 5 can be shifted in such a manner that the
coupling positions of the adjustable connections 5
correspond to the reference coupling positions for a
specific weaving configuration.
[0047] According to another embodiment, the profiled
section 32 is designed as openings through the inner
side 30 of the template 2 9 which are such that the
adjustable connections 5 can only be shifted over the
drive levers 4 in these openings. According to yet
another embodiment, a template 2 9 is placed on the
drive levers 4 and indications are provided, for
example by following the profiled section 32 using a
felt-tip pen. Thereafter, the indications can be
provided in another suitable way on the drive levers 4 .
As a result thereof, the adjustable connections 5 can,
for example, be set to the reference coupling positions
as indicated by the indications.
[0048] Fig. 12 diagrammat ically shows a shed-forming
device 1 for a heald frame 3 having a drive lever 33
and a transmission mechanism 34. In this case, the
drive lever 33 is incorporated into the transmission
mechanism 34. The driving device 14 for driving the
drive lever 33 comprises a drive shaft 35, an eccenter
3 6 provided on the drive shaft 35, a drive rod 37
driven by the eccenter 36, a lever 3 9 which is driven,
via the shaft 38, by the drive rod 37 and which is
arranged so as to be rotatable about a shaft 40, and a
rod 42 which is driven by the lever 3 9 via a shaft 41.
Via the connection 5 , the rod 42 drives the drive lever
33. In this embodiment, the drive lever 33 is made in
one piece with the first hinge lever 43 of the
transmission mechanism 34 and is connected to the rod
42 of the driving device 14 via the connection 5 . The
transmission mechanism 34, comprising the first hinge
lever 43, a horizontal rod 8 , a second hinge lever 9 , a
third hinge lever 54 and three vertical rods 10, 11 and
55, transmits the movement of the drive lever 33 to the
heald frame 3 . According to a variant (not shown), the
transmission mechanism may comprise more than three
hinge levers and associated vertical rods.
[0049] Fig. 13 shows a shed-forming device 1 which is
similar to that from Fig. 12, but in which the
dimensions of the hinge levers 43 and 9 differ from
those of Fig. 12, more particularly, the distance E
between a rotation point 44 of a hinge lever 43, 9 and
the shaft 45 for a rod 10, 11 is greater than the
distance E indicated in Fig. 12. This makes it possible
for the amplitude of the movement of the heald frame 3
from Fig. 13 to be larger than the amplitude of the
movement of the heald frame 3 from Fig. 12 at the same
course of movement or angular rotation of a drive lever
33.
[0050] In Fig. 14 a group 24 of drive levers 33 is
formed which are embodied, for example, as indicated in
Fig. 12, and a group 25 of drive levers which are
embodied, for example, as indicated in Fig. 13, viewed
in accordance with arrow C . In order to achieve a
virtually linear curve of the amplitude of movement of
the successive heald frames 3 , the successive reference
coupling positions in this case also have a step at the
location of a spot of two adjacent drive levers 33
which belong to a different group 24 or 25. The
difference in transmission mechanism 34 leads to a step
as can be seen with the indications 4 6 applied to the
drive levers 33 as shown in Fig. 14.
[0051] A shed-forming device 1 according to the
invention is produced by applying at least one
indication 22, 23, 27, 28, 4 6 for a reference coupling
position to a drive lever 4 , 33. According to the
invention, by using such an indication 22, 23, 27, 28,
46, a drive lever 4 , 33 and a transmission mechanism 2 ,
34 can be coupled in a specific coupling position by
means of a connection 5 , with the coupling position
being determined as a function of at least one
indication 22, 23, 27, 28, 4 6 for a reference coupling
position which is provided on the drive lever 4 , 33.
[0052] The shed-forming device and the methods
according to the invention illustrated in the claims is
not limited to the exemplary embodiments illustrated
and described by way of example, but may also comprise
variants and combinations of these exemplary
embodiments which fall under the scope of the claims.
Claims
1 . A shed-forming device for a weaving machine,
wherein the shed-forming device (1) comprises a number
of drive levers (4, 33) and a number of transmission
mechanisms (2, 34), wherein each transmission mechanism
(2, 34) can drive a heald frame (3) and can be driven
by a driving device (14) via a drive lever (4, 33) , and
wherein the transmission mechanism (2, 34) and the
drive lever (4, 33) are coupled in a specific coupling
position by means of a connection (5), characterized in
that at least one indication (22, 23, 27, 28, 46) for a
reference coupling position is provided on at least one
drive lever (4, 33) .
2 . The shed-forming device according to claim 1 ,
characterized in that at least one indication
(22, 23, 27, 28, 46) for a reference coupling position
is provided on a number of predetermined drive levers
(4, 33) of the shed-forming device (1) .
3 . The shed-forming device according to claim 1 or 2 ,
characterized in that at least one indication
(22, 23, 27, 28, 46) for a reference coupling position
is provided on each drive lever (4, 33) of the shedforming
device (1) .
4 . The shed-forming device according to one of claims
1 to 3 , characterized in that the drive levers (4) are
integrated into the driving device (14) .
5 . The shed-forming device according to one of claims
1 to 3 , characterized in that the drive levers (33) are
integrated into the transmission mechanism (34) .
6 . The shed-forming device according to one of claims
1 to 5 , characterized in that on at least two drive
levers (4, 33) which are arranged next to one another
at least one indication (22, 23, 27, 28, 46) for a
reference coupling position is provided, each.
7 . A method for producing a shed-forming device (1)
for a weaving machine, wherein the shed-forming device
(1) comprises a number of drive levers (4, 33) and a
number of transmission mechanisms (2, 34), wherein each
transmission mechanism (2, 34) can drive a heald frame
(3) and can be driven by a driving device (14) via a
drive lever (4, 33), and wherein the transmission
mechanism (2, 34) and the drive lever (4, 33) are
coupled in a specific coupling position by means of a
connection (5), characterized in that at least one
indication (22, 23, 27, 28, 46) for a reference
coupling position is provided on at least one drive
lever (4, 33) .
8 . The method according to claim 7 , characterized in
that at least one indication (22, 23, 27, 28, 46) for a
reference coupling position is provided on at least two
drive levers (4, 33) which are arranged next to one
another .
9 . The method according to claim 7 or 8 ,
characterized in that a template (29) is used in order
to provide at least one indication
(22, 23, 27, 28, 46) .
10. A method for setting a shed-forming device (1) for
a weaving machine, wherein the shed-forming device (1)
comprises a number of drive levers (4, 33) and a number
of transmission mechanisms (2, 34), wherein each
transmission mechanism (2, 34) can drive a heald frame
(3) and can be driven by a driving device (14) via a
drive lever (4, 33), and wherein the transmission
mechanism (2, 34) and the drive lever (4, 33) are
coupled in a specific coupling position by means of a
connection (5), characterized in that the coupling
position between the transmission mechanism (2, 34) and
the drive lever (4, 33) is set based on an indication
(22, 23, 27, 28, 46) for a reference coupling position
which is provided on the drive lever (4, 33) .