U.S. patent application number 10/417325 was filed with the patent office on 2003-10-23 for apparatus and method for the production of roller blinds.
Invention is credited to Wilson, Neil.
Application Number | 20030197085 10/417325 |
Document ID | / |
Family ID | 9935047 |
Filed Date | 2003-10-23 |
United States Patent
Application |
20030197085 |
Kind Code |
A1 |
Wilson, Neil |
October 23, 2003 |
Apparatus and method for the production of roller blinds
Abstract
Apparatus for use in the manufacture of roller blinds includes
means for mounting and rotating one or more roller blind tubes,
means for aligning the fabric and means for cutting the fabric to a
desired width. Each of these means is arranged in a fix angular
arrangement with respect to the other. The mounting means are
adjustable to accommodate roller blind tubes of different lengths
and the width cutting means are adjustable also. Preferably an
adjustable width cutting means and an adjustable mounting means are
mounted on a common bracket for adjustment in a single step.
Inventors: |
Wilson, Neil; (Glasgow,
GB) |
Correspondence
Address: |
ROTHWELL, FIGG, ERNST & MANBECK, P.C.
1425 K STREET, N.W.
SUITE 800
WASHINGTON
DC
20005
US
|
Family ID: |
9935047 |
Appl. No.: |
10/417325 |
Filed: |
April 17, 2003 |
Current U.S.
Class: |
242/524.1 ;
242/598.1 |
Current CPC
Class: |
E06B 9/40 20130101 |
Class at
Publication: |
242/524.1 ;
242/598.1 |
International
Class: |
B65H 035/00 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 17, 2002 |
GB |
GB0208851.6 |
Claims
1. Apparatus for use in the manufacture of a roller blind
comprising: (i) drive means for feeding a web of fabric through the
apparatus parallel to a first direction; (vi) alignment means for
aligning the web of fabric with respect to the first direction;
(vii) first and second roller blind tube mounting means for
mounting a roller blind tube on the apparatus by its respective
ends such that the longitudinal axis of the tube lies in a second
direction perpendicular to the first direction, wherein at least
one of the mounting means is adjustable in the second direction in
order to mount roller blind tubes of different lengths; (viii)
roller blind tube drive means for driving one of the mounting means
to rotate the roller blind tube about its longitudinal axis; (ix)
width cutting means for cutting the web of fabric to a desired
width in accordance with the length of the roller blind tube
wherein the alignment means, mounting means and cutting means are
mounted in fixed angular relation with respect to one another.
2. Apparatus as claimed in claim 1 wherein the width cutting means
comprise at least a first width cutting means which is adjustable
in the second direction and is mounted in fixed angular relation to
the alignment means and the mounting means.
3. Apparatus as claimed in claim 2 wherein the adjustable width
cutting means is mounted in fixed relation to the adjustable
mounting means, for movement therewith.
4. Apparatus as claimed in claim 3 wherein the adjustable mounting
means and the adjustable width cutting means are mounted on a
common bracket, which bracket is mounted for slideable movement
parallel to the second direction.
5. Apparatus as claimed in claim 4 including means for locking the
common bracket in a desired location after adjustment.
6. Apparatus for use in the manufacture of roller blinds
comprising: (i) drive means for feeding a web of fabric through the
apparatus parallel to a first direction; (vi) alignment means for
aligning the web of fabric with respect to the first direction;
(vii) mounting components for mounting n roller blind tubes, where
n is an integer greater than 1, such that the longitudinal axis of
each roller blind tube lies in a second direction perpendicular to
the first direction, said mounting components comprising first
mounting means for mounting a proximal end of a first roller blind
tube, second mounting means for mounting a distal end of a final
roller blind tube and n-1 intermediate mounting means for mounting
adjacent respective proximal and distal ends of intermediate roller
blind tubes, or, where n=2 for mounting the distal end of the first
roller blind tube and the adjacent proximal end of the second
roller blind tube, the second and intermediate mounting means being
adjustable in the second direction in order to mount roller blind
tubes of different lengths; (viii) roller blind tube drive means
for driving one of the mounting means to rotate the roller blind
tubes about the longitudinal axis and; (ix) a plurality of width
cutting means for cutting the web of fabric to a desired widths in
accordance with the respective lengths of the roller blind tubes
wherein the alignment means, mounting means and cutting means are
mounted in fixed angular relation with respect to one another.
7. Apparatus as claimed in claim 6 wherein at least n of the width
cutting means are adjustable in the second direction and are
mounted in fixed angular relation to the alignment means and the
mounting means.
8. Apparatus as claimed in claim 7 wherein the adjustable width
cutting means are mounted in fixed relation to respective
adjustable mounting means, for movement therewith.
9. Apparatus as claimed in claim 8 wherein each respective
adjustable mounting means and adjustable width cutting means is
mounted on a common bracket, which brackets are mounted for
slideable movement parallel to the second direction.
10. Apparatus as claimed in claim 9 including means provided on
each common bracket for locking the bracket in a desired location
after adjustment.
11. Apparatus as claimed in any preceding claim wherein the drive
means comprise a pair of pinch rollers mounted with their axes of
rotation parallel to the second direction and perpendicular to the
first direction.
12. Apparatus as claimed in any preceding claim comprising a planar
support surface over which the web of fabric is passed prior to the
drive means.
13. Apparatus as claimed in claim 12 wherein the alignment means
comprises a planar surface disposed at one side of the support
surface, said planar surface having a component parallel to the
first direction and perpendicular to the second direction, and
along which in use, the edge of the fabric makes running
contact.
14. Apparatus as claimed in any of claim 13 wherein the planar
support surface comprises a cutting guide for ensuring accurate
cutting of the trailing end of the fabric.
15. Apparatus as claimed in claim 14 wherein the cutting guide
comprises a linear groove disposed in the planar support
surface.
16. Apparatus as claimed in claim 14 or 15 further comprising
clamping means operable to hold the fabric against the planar
surface during cutting of the trailing end of the fabric.
17. Apparatus as claimed in any preceding claim wherein the roller
blind tube drive means includes a slipping clutch operative to
maintain a desired tension in the web of fabric.
18. Apparatus as claimed in any preceding claim further comprising
a brake operable to act on the roller blind tube drive means.
19. Apparatus as claimed in any preceding claim further comprising
means of introducing back tension to the web of fabric.
20. Apparatus as claimed in any preceding claim further comprising
electronic control means operative to start and stop the respective
drive means.
21. Apparatus as claimed in claim 20 wherein the control means is
operative to stop the respective drive means at a predetermined
point for cutting of the trailing end of the fabric.
22. Apparatus as claimed in claim 21 wherein the control means
calculates the predetermined point in accordance with an operator
input of a desired blind length.
23. Apparatus as claimed in claim 20, 21 or 22 when dependent on
claim 18 wherein the control means is operative to apply the brake
as the trailing end of the fabric approaches the cutting means.
24. A roller blind tube for use on the apparatus of any preceding
claim comprising a hollow metal tube and a cutting guide for
guiding cutting of the leading end of the fabric.
25. A roller blind tube as claimed in claim 24 wherein the cutting
guide comprises a linear groove disposed in the external surface of
the roller blind tube, and parallel to the longitudinal axis of the
tube.
26. A roller blind tube as claimed in claim 24 or 25 including a
formation, operative to co-operate with a corresponding formation
on the driven roller blind tube mounting means, whereby the roller
blind tube is mountable on the apparatus only in a predetermined
rotational orientation.
27. Apparatus as claimed in any of claims 1 to 23 further
comprising a roller blind tube as claimed in claim 24, 25 or
26.
28. An assembly for use in the manufacture of a roller blind
comprising a roller blind tube as claimed in any of claims 24 to 26
and a body of fabric wound around the roller blind tube.
29. An assembly as claimed in claim 28 wherein the edges of the
body of fabric are parallel to the respective ends of the roller
blind tube and/or the trailing end of the body of fabric is
parallel to the longitudinal axis of the roller blind tube.
30. A roller blind including a roller blind tube as claimed in
claim 24, 25 or 26 or including an assembly as claimed in claim 28
or 29.
31. A method of producing an assembly for use in the manufacture of
a roller blind, said assembly comprising a roller blind tube with a
body of fabric wound thereupon, the method comprising the steps of:
(xiv) providing an apparatus as claimed in claim 1; (xv) providing
a roller blind tube; (xvi) mounting a first end of the roller blind
tube on the driven roller blind tube mounting means; (xvii)
adjusting the location of the adjustable roller blind tube mounting
means and mounting the second end of the roller blind tube on said
adjustable roller blind tube mounting means; (xviii) adjusting the
location of the width cutting means at at least one side of the
apparatus in accordance with the desired width of the body of
fabric. (xix) aligning a web of fabric with the alignment means;
(xx) driving the respective driving means to drive the web of
fabric through the apparatus via the width cutting means until the
leading end reaches the roller blind tube; (xxi) stopping the drive
means and mounting the leading end of the web of fabric on the
roller blind tube; (xxii) re-starting the respective drive means
and driving a predetermined length of fabric through the apparatus
via the width cutting means; (xxiii) stopping the respective
driving means; (xxiv) cutting the trailing end of the fabric along
a line perpendicular to the adjacent means; (xxv) re-starting the
respective driving means; and (xxvi) optionally, applying a brake
to the driving means of the roller blind tube mounting means to
slow said means as the trailing end of the web of fabric is cut by
the width cutting means.
32. A method as claimed in claim 31 wherein the adjustable roller
blind tube mounting means and the adjustable width cutting means
are mounted in fixed relation to each other whereby steps (iv) and
(v) are performed in a single operation.
33. A method as claimed in claim 31 or 32 including, after step
(viii), the step of (viii)a) cutting the leading edge of the web of
fabric so that it is parallel to the longitudinal axis of the
roller blind tube.
34. A method as claimed in claim 33 wherein the roller blind tube
includes a cutting guide in its external surface in the form of a
linear groove parallel to the longitudinal axis of the roller blind
tube, and said step (viii)a) comprises cutting said leading edge
with a knife by guiding the knife blade in said groove.
35. A method as claimed in any of claims 31 to 34 further
comprising providing a slipping clutch for the roller blind tube
driving means and maintaining a desired tension in the web of
fabric by means of said slipping clutch.
36. A method as claimed in any of claims 31 to 35 further
comprising, in step (xi), providing a planar support surface having
a cutting guide in the form of a linear groove perpendicular to the
alignment means and cutting said trailing end by guiding a cutting
knife along said groove.
37. A method as claimed in any of claims 31 to 36 further
comprising the step of providing clamping means and clamping the
web of fabric against a support surface and in step (xi) cutting
the trailing end of the web of fabric proximate said clamping
means.
38. A method as claimed in any of claims 31 to 37 further
comprising the step of introducing back tension into the web of
fabric.
39. An apparatus or method substantially as hereinbefore described
with reference to any of FIGS. 1 to 15.
Description
[0001] The present invention relates to a new apparatus for the
production of roller blinds and to a method of producing roller
blinds employing the apparatus.
[0002] Roller blinds are well known and generally comprise a tube
or cylinder around which a body of fabric is wound. The tube
carrying the fabric is mounted in a window casement so that the
tube can rotate, generally against a spring bias, to unroll the
fabric and so cover the window.
[0003] Mounting of the fabric on the roller blind tube during
manufacture presents a number of problems. Clearly a roller blind
must be manufactured in a size which corresponds to the size of the
window in which the blind is to be mounted. This in turn means that
the fabric must be cut to size in terms of both of its length and
its width before it can be mounted on the roller blind tube. After
the fabric has been cut to size, it must be mounted in the correct
orientation on the roller blind tube. Conventionally, the fabric is
cut on a large cutting table which must be at least as large as the
largest piece of fabric to be used in blind manufacture when laid
out flat. Each side of the fabric is cut individually, for example
using a guillotine-type roller cutter and great care and attention
is required to ensure that the sides are cut straight and that
adjacent sides are perpendicular (and opposite sides are parallel)
so that a perfectly rectangular piece of fabric is formed. This is
time consuming and subject to inaccuracies.
[0004] The cut fabric is conventionally mounted manually on the
roller blind tube, with the correct alignment being judged by eye.
This requires considerable skill as only a small misalignment can
result in an unsatisfactory blind. The fabric then has to be rolled
onto the tube evenly to ensure the edges are perpendicular to the
tube and do not cone to one side. Where such coning occurs, small
strips of fabric may need to be inserted at the edge of the fabric
as it is rolled to correct the coning. The depth of insertion of
these fabric corrector strips must be judged and adjusted to
provide the correct degree of coning correction. The fabric also
has to be rolled at the correct tension to avoid coning problems
when the blind is operated.
[0005] The present invention seeks to overcome all the above
problems and provides an apparatus for cutting fabric and mounting
the cut fabric on a roller blind tube such that the fabric is cut
automatically to the correct size and is automatically mounted on
the roller blind tube in the correct alignment. The apparatus of
the invention produces correctly cut, tensioned and aligned fabric
on a roller blind tube in approximately 25% of the time of the
conventional method, and requiring approximately 25% of the space.
In variations of the invention, the apparatus can be modified to
accommodate more than one roller blind tube so that a plurality of
roller blinds can be manufactured at the same time.
[0006] According to a first aspect of the present invention there
is provided an apparatus for use in the manufacture of a roller
blind comprising:
[0007] (i) drive means for feeding a web of fabric through the
apparatus parallel to a first direction;
[0008] (ii) alignment means for aligning the web of fabric with
respect to the first direction;
[0009] (iii) first and second roller blind tube mounting means for
mounting a roller blind tube on the apparatus by its respective
ends such that the longitudinal axis of the tube lies in a second
direction perpendicular to the first direction, wherein at least
one of the mounting means is adjustable in the second direction in
order to mount roller blind tubes of different lengths;
[0010] (iv) roller blind tube drive means for driving one of the
mounting means to rotate the roller blind tube about its
longitudinal axis;
[0011] (v) width cutting means for cutting the web of fabric to a
desired width in accordance with the length of the roller blind
tube
[0012] wherein the alignment means, mounting means and cutting
means are mounted in fixed angular relation with respect to one
another.
[0013] Most preferably, in this apparatus the width cutting means
comprise at least a first width cutting means which is adjustable
in the second direction and is mounted in fixed angular relation to
the alignment means and the mounting means. In a particularly
preferred embodiment, the adjustable width cutting means is mounted
in fixed relation to the adjustable mounting means, for movement
therewith.
[0014] In an especially advantageous arrangement of the apparatus
the adjustable mounting means and the adjustable width cutting
means are mounted on a common bracket, which bracket is mounted for
slideable movement parallel to the second direction. Preferably
means are provided for locking the common bracket in a desired
location after adjustment.
[0015] According to a second aspect of the present invention there
is provided apparatus for use in the manufacture of roller blinds
comprising:
[0016] (i) drive means for feeding a web of fabric through the
apparatus parallel to a first direction;
[0017] (ii) alignment means for aligning the web of fabric with
respect to the first direction;
[0018] (iii) mounting components for mounting n roller blind tubes,
where n is an integer greater than 1, such that the longitudinal
axis of each roller blind tube lies in a second direction
perpendicular to the first direction, said mounting components
comprising first mounting means for mounting a proximal end of a
first roller blind tube, second mounting means for mounting a
distal end of a final roller blind tube and n-1 intermediate
mounting means for mounting adjacent respective proximal and distal
ends of intermediate roller blind tubes, or, where n=2 for mounting
the distal end of the first roller blind tube and the adjacent
proximal end of the second roller blind tube, the second and
intermediate mounting means being adjustable in the second
direction in order to mount roller blind tubes of different
lengths;
[0019] (iv) roller blind tube drive means for driving one of the
mounting means to rotate the roller blind tubes about the
longitudinal axis and;
[0020] (v) a plurality of width cutting means for cutting the web
of fabric to a desired widths in accordance with the respective
lengths of the roller blind tubes
[0021] wherein the alignment means, mounting means and cutting
means are mounted in fixed angular relation with respect to one
another.
[0022] Most preferably, in this apparatus at least n of the width
cutting means are adjustable in the second direction and are
mounted in fixed angular relation to the alignment means and the
mounting means. In a particularly preferred embodiment, the
adjustable width cutting means are mounted in fixed relation to
respective adjustable mounting means, for movement therewith.
[0023] In an especially advantageous arrangement of the apparatus
each respective adjustable mounting means and adjustable width
cutting means is mounted on a common bracket, which brackets are
mounted for slideable movement parallel to the second direction.
Preferably means are provided on each common bracket for locking
the bracket in a desired location after adjustment.
[0024] In another preferred embodiment of these aspects of the
invention the drive means comprise a pair of pinch rollers mounted
with their axes of rotation parallel to the second direction and
perpendicular to the first direction.
[0025] Preferably the apparatus further comprises a planar support
surface over which the web of fabric is passed prior to the drive
means.
[0026] In another preferred arrangement the alignment means
comprises a planar surface disposed at one side of the support
surface, said planar surface having a component parallel to the
first direction and perpendicular to the second direction, and
along which in use, the edge of the fabric makes running contact.
Preferably also the planar support surface comprises a cutting
guide for ensuring accurate cutting of the trailing end of the
fabric. In a preferred form, the cutting guide comprises a linear
groove disposed in the planar support surface. In order to hold the
fabric in place during cutting, preferably the apparatus also
comprises clamping means operable to hold the fabric against the
planar surface during cutting of the trailing end of the
fabric.
[0027] In another advantageous embodiment, the roller blind tube
drive means includes a slipping clutch operative to maintain a
desired tension in the web of fabric.
[0028] To assist in accurate cutting of the trailing end of the
fabric, the apparatus preferably further comprises a brake operable
to act on the roller blind tube drive means.
[0029] Preferably the apparatus of the invention further comprises
means of introducing back tension to the web of fabric. Also the
apparatus preferably comprises electronic control means operative
to start and stop the respective drive means. In preferred forms of
the invention, the control means is operative to stop the
respective drive means at a predetermined point for cutting of the
trailing end of the fabric. The control means may calculate the
predetermined point in accordance with an operator input of a
desired blind length.
[0030] Where the apparatus is provided with a brake, the control
means is preferably operative to apply the brake as the trailing
end of the fabric approaches the cutting means.
[0031] According to a third aspect of the invention there is
provided a roller blind tube for use on the apparatus of the first
and second aspects of the invention, comprising a hollow metal tube
and a cutting guide for guiding cutting of the leading end of the
fabric. Preferably, the cutting guide comprises a linear groove
disposed in the external surface of the roller blind tube, and
parallel to the longitudinal axis of the tube.
[0032] In one variation the roller blind tube 25 includes a
formation, operative to co-operate with a corresponding formation
on the driven roller blind tube mounting means, whereby the roller
blind tube is mountable on the apparatus only in a predetermined
rotational orientation.
[0033] In a fourth aspect of the invention there is provided an
apparatus as defined in first or second aspects of the invention
further comprising a roller blind tube as defined in the third
aspect of the invention.
[0034] A fifth aspect of the invention provides an assembly for use
in the manufacture of a roller blind comprising a roller blind tube
as defined in the third aspect of the invention and a body of
fabric wound around the roller blind tube. In preferred such
assemblies, the edges of the body of fabric are parallel to the
respective ends of the roller blind tube and/or the trailing end of
the body of fabric is parallel to the longitudinal axis of the
roller blind tube.
[0035] A sixth aspect of the invention provides a roller blind
including a roller blind tube as defined in the fourth aspect of
the invention or including an assembly as defined in the fifth
aspect of the invention..
[0036] According to a seventh aspect of the invention there is
provided a method of producing an assembly for use in the
manufacture of a roller blind, said assembly comprising a roller
blind tube with a body of fabric wound thereupon, the method
comprising the steps of:
[0037] (i) providing an apparatus as claimed in claim 1;
[0038] (ii) providing a roller blind tube;
[0039] (iii) mounting a first end of the roller blind tube on the
driven roller blind tube mounting means;
[0040] (iv) adjusting the location of the adjustable roller blind
tube mounting means and mounting the second end of the roller blind
tube on said adjustable roller blind tube mounting means;
[0041] (v) adjusting the location of the width cutting means at at
least one side of the apparatus in accordance with the desired
width of the body of fabric.
[0042] (vi) aligning a web of fabric with the alignment means;
[0043] (vii) driving the respective driving means to drive the web
of fabric through the apparatus via the width cutting means until
the leading end reaches the roller blind tube;
[0044] (viii) stopping the drive means and mounting the leading end
of the web of fabric on the roller blind tube;
[0045] (ix) re-starting the respective drive means and driving a
predetermined length of fabric through the apparatus via the width
cutting means;
[0046] (x) stopping the respective driving means;
[0047] (xi) cutting the trailing end of the fabric along a line
perpendicular to the adjacent means;
[0048] (xii) re-starting the respective driving means; and
[0049] (xiii) optionally, applying a brake to the driving means of
the roller blind tube mounting means to slow said means as the
trailing end of the web of fabric is cut by the width cutting
means.
[0050] In a preferred embodiment of this seventh aspect of the
invention, the adjustable roller blind tube mounting means and the
adjustable width cutting means are mounted in fixed relation to
each other whereby steps (iv) and (v) are performed in a single
operation.
[0051] A preferred variation of this aspect of the invention
includes, after step (viii), the step of (viii)a) cutting the
leading edge of the web of fabric so that it is parallel to the
longitudinal axis of the roller blind tube. Preferably, the roller
blind tube includes a cutting guide in its external surface in the
form of a linear groove parallel to the longitudinal axis of the
roller blind, tube, and said step (viii)a) comprises cutting said
leading edge with a knife by guiding the knife blade in said
groove.
[0052] In another preferred embodiment of this aspect of the
invention, the method further comprises providing a slipping clutch
for the roller blind tube driving means and maintaining a desired
tension in the web of fabric by means of said slipping clutch.
[0053] In another preferred variation of this aspect of the
invention the method further comprises, in step (xi), providing a
planar support surface having a cutting guide in the form of a
linear groove perpendicular to the alignment means and cutting said
trailing end by guiding a cutting knife along said groove.
[0054] A further preferred variation of this aspect of the
invention further comprises the step of providing clamping means
and clamping the web of fabric against a support surface and in
step (xi) cutting the trailing end of the web of fabric proximate
said clamping means.
[0055] Preferably, the method of this aspect of the invention
further comprises the step of introducing back tension into the web
of fabric.
[0056] For a better understanding of the invention and to show how
the same may be carried into effect, reference will now be made, by
way of example only, to the following drawings, in which:
[0057] FIG. 1 is a general perspective view of the apparatus
according to the invention;
[0058] FIG. 2 is a perspective view of the apparatus according to
the invention showing initial stages of feeding the fabric through
the apparatus;
[0059] FIG. 3 is a perspective view of the apparatus according to
the invention showing a later stage of feeding the fabric through
the apparatus;
[0060] FIGS. 4 and 5 show the mounting of the roller blind tube on
driven end mounting means according to the invention;
[0061] FIGS. 6 and 7 show the mounting of the roller blind tube on
idle end mounting means according to the invention;
[0062] FIGS. 8 and 9 show details of the locking means for idle end
mounting means in respective unlocked and locked positions;
[0063] FIG. 10 shows the attaching of the fabric to the roller
blind tube;
[0064] FIG. 11a is a schematic perspective view of an alternative
roller blind tube and
[0065] FIG. 11b shows a detail of the attachment of the fabric to
the roller blind tube of FIG. 11a;
[0066] FIG. 12 illustrates in more detail the width cutting of the
fabric;
[0067] FIGS. 13 and 14 show the operation of the back tensioning
means in the apparatus according to the invention;
[0068] FIG. 15 shows the cutting of the trailing end of the
fabric;
[0069] Referring now to the drawings, the apparatus (10) comprises
fabric holding means (1) to support a body of fabric (3a) such as a
roll of fabric prior to cutting to form a blind, a support surface
(5) over which the web of fabric (3) passes in use, drive means (7)
for moving the web of fabric (3) through the apparatus (10) and
mounting means (9a, 9b) for a roller blind tube (11) onto which
tube (11) the web of fabric (3) is rolled in order to form the
roller blind. As the web of fabric (3) passes through the apparatus
(10), one or more width cutting means (13a, 13b) are provided to
cut the web of fabric (3) to a desired width. Further means (15)
are preferably provided to cut, or assist in cutting, the leading
and/or trailing ends of the fabric (3), so that the fabric is cut
to a desired length. To ensure that the web of fabric (3) is
aligned in the desired orientation in the apparatus, alignment
means (17a, 17b) are provided.
[0070] The web of fabric (3) may initially be folded or may be in
the form of a bolt or roll. The fabric holding means (1) may take
any suitable form, provided that the web of fabric (3) may be fed
from said holding means without undue restriction. A simple fabric
holding cradle (1) as illustrated in FIG. 1 is normally
sufficient.
[0071] From the fabric holding means (1), the web of fabric (3)
passes over the support surface (5) in which a cutting guide (15)
may be disposed, as will be described below. From the support
surface (5), the web of fabric (3) passes on to fabric drive means
(7) such as, for example, a pair of pinch rollers, which assist in
moving the web of fabric (3) through the apparatus. The support
surface (5) includes alignment means (17a) to ensure that the web
of fabric (3) is correctly aligned in the apparatus (10), and that
the alignment is maintained as the web of fabric (3) continues to
pass through the apparatus (10). The alignment means (17a)
preferably comprise a formation disposed at one side of the support
surface (5), which formation includes a generally upright planar
surface. The web of fabric (3) should pass through the apparatus
(10) of the invention in a first direction indicated generally by
arrow A and the plane of said generally upright planar surface
includes at least a first component which is disposed exactly
parallel to said first direction. Thus, alignment of the web of
fabric (3) is achieved by ensuring that the side edge of the fabric
(3) maintains a running contact with the generally upright planar
surface. Preferably, the upright planar surface will be vertical,
but some deviation from vertical is acceptable.
[0072] Where, as in the preferred embodiment, the fabric drive
means (7) comprise pinch rollers (7a, 7b(7b not shown)), the
rollers (7a, 7b) are arranged such that the alignment of the web of
fabric (3) achieved by the alignment means is maintained and is not
disrupted. Specifically the pinch rollers (7a, 7b) are arranged so
that their axes lie perpendicular to the first direction A and
perpendicular to the plane of the planar surface of the alignment
means (17a).
[0073] In the illustrated embodiment, the web of fabric (3) passes
around the upper pinch roller (7a) (see FIG. 3) and on to the
roller blind tube (11), around which it is rolled by the apparatus
(10) of the invention. The roller blind tube (11) is a
substantially rigid tube, preferably of metal but possibly of
plastic or other suitable material. Cardboard tube may be used in
some cases. The web of fabric (3) is rolled around the tube and, in
further manufacturing stages not part of this invention, the tube
(11) is provided with suitable fixings such as end caps and
brackets to form a blind which may be mounted in a window. It is
also possible that the roller blind tube (11) may take the form of
a solid rod, such as of wood, but this is less preferred.
[0074] The roller blind tube (11) is mounted on the apparatus (10)
of the invention by suitable mounting means (9a, 9b) at its
respective ends. One or both of the mounting means (9a, 9b) is
driven to cause it to rotate, and thereby to rotate the roller
blind tube (11) when mounted thereon. Preferably, only one of the
mounting means is driven (hereinafter the "driven end mounting
means" (9b)), the other (hereinafter the "idle end mounting means"
(9a)) being able to rotate freely. Thus, when the roller blind tube
(11) is mounted on the mounting means (9a, 9b), the roller blind
tube (11)is rotatably driven so that, after the leading end of the
web of fabric (3) has been attached to the roller blind tube (11),
the fabric may be taken up onto the roller blind tube (11).
[0075] The particular form of the mounting means (9a, 9b) may be
selected as desired provided that rotational drive is effectively
transferred from suitable drive means (19) via the mounting means
(9b) to the roller blind tube (11) and provided also that the
mounting means (9a, 9b) maintain the roller blind tube (11) in a
correct alignment. Specifically, the roller blind tube (11) must be
maintained so that its axis of rotation (i.e. the longitudinal
axis) is parallel to the axes of the pinch rollers (7a, 7b) and
more particularly so that said axis of rotation is perpendicular to
the first direction A and to said first component of the plane of
the planar surface of the alignment means (17a). Generally, the
mounting means (9b) will be such that drive is transferred to the
roller blind tube (11) by frictional engagement of the mounting
means (9b) with the inside surface of the roller blind tube (11).
It may be desirable to provide co-operating features on the
mounting means (9b) and the roller blind tube (11) to assist in the
transfer of drive but this is not normally necessary. Such features
may also be useful in ensuring that the roller blind tube (11) may
be mounted on the mounting means (9b) only in one particular
rotational orientation. For example, the roller blind tube (11) may
be provided with a protruding formation on its inner surface which
co-operates with a groove in the mounting means (9b) so that the
roller blind tube (11) may be mounted on the mounting means (9b)
only when the protrusion is aligned with the groove.
[0076] It is a particular feature of the present invention that the
apparatus (10) is suitable for manufacturing roller blinds of
various widths, to accommodate different window sizes, for example.
Usually, it is desired that the width of the web fabric mounted on
a roller blind tube (11) is exactly the same as the length of the
roller blind tube, or only a few millimetres greater or smaller to
suit the particular roller blind mechanism being used. Thus, the
apparatus (10) of the invention accommodates roller blind tubes
(11) of various lengths by providing that one or both of the roller
blind tube mounting means (9a, 9b) is adjustable in a second
direction parallel to the axis of rotation of the roller blind tube
(11) (and therefore perpendicular to the first direction A and to
said first component of the plane of the planar surface of the
alignment means (17a)). Preferably, the driven end mounting means
(9b) is fixed and the idle end mounting means (9a) is adjustable.
Thus, in order to mount a roller blind tube (11) on the apparatus
of the invention, the position of the idle end mounting means (9a)
may be adjusted so that, initially, the distance between the
respective mounting means (9a, 9b) is greater than the length of
the particular roller blind tube (11) to be used. One end of the
roller blind tube (11) is then engaged with the driven end mounting
means (9b) (see FIGS. 4 and 5) and the position of the idle end
mounting means (9a) is re-adjusted so that it engages the other end
of the roller blind tube (11) (see FIGS. 6 and 7). The idle end
mounting means (9a) may then be fixed or locked in position by
suitable means (21), such that the roller blind tube (11) is
retained in its use position by the mounting means (9a, 9b).
[0077] Preferably, the idle end mounting means (9a) is disposed on
a bracket (23) or the like which is slideably mounted on a bar or
rail (25). The bar or rail (25) is arranged to be parallel to the
desired axis of rotation of the roller blind tube (11), so that the
bracket (23) for the idle end mounting means (9a) slides parallel
to said axis. The means (21) for locking the idle end mounting
means (9a) in position may comprise means for bringing a component
of said bracket (23) into frictional engagement with the bar or
rail (25). Suitable means (21) can be seen most clearly in FIGS. 8
and 9, in the form of a toggle clamp (22). In FIG. 8, the toggle
clamp (22) is in its released position so that the bracket (23) can
slide on the rail (25) and in FIG. 9 the toggle clamp (22) is in
its locking position so that the bracket (23) is fixed with respect
to the rail (25).
[0078] In one variation of the invention, the apparatus of the
invention is adapted for the simultaneous manufacture of a
plurality of roller blind tubes. In this variation, a first roller
blind tube (11') is mounted on the driven end mounting means (9b)
as described above. The idle end mounting means (9a) is modified
(9a') to mount two roller blind tubes (11', 11") along the same
axis of rotation, that is, so that the two roller blind tubes are
mounted "end to end". Thus, the modified idle end mounting means
(9a') is adjusted in the same manner as described above with
reference to means (9a) so that it engages the second end of the
first roller blind tube (11'). A first end of the second roller
blind tube (11") is then mounted on the other side of the modified
idle end mounting means (9a'). A further idle end mounting means
(9a") which is adjustable, preferably in the same manner as idle
end mounting means (9a), is provided to mount the second end of the
second roller blind tube (11"). Thus, rotational drive is
transferred from the drive means (19) to the driven end mounting
means (9b) which transfers drive to the first roller blind tube (11
') which in turn transfers drive to the modified idle end mounting
means (9a') which transfers drive to the second roller blind tube
(11"). Further additional roller blind tubes may be added by
modifying the apparatus to include further additional modified idle
end mounting means.
[0079] After having passed around the upper pinch roller (7a) in
the embodiment illustrated, the leading edge of the web of fabric
(3) must be attached to the roller blind tube (11) to allow the
fabric (3) to be taken up onto the roller blind tube (11). This can
be achieved by any suitable means but a preferred embodiment of the
present invention is particularly convenient. In this embodiment,
the outer surface of the roller blind tube is provided with one or
more adhesive zones 27 such as one or more pieces of double-sided
sticky tape. Most preferably, a single strip of such tape is
provided running generally parallel to the longitudinal axis of the
roller blind tube (11) and extending for substantially the whole
length of the roller blind tube (11). In this way, the leading edge
of the web of fabric (3) can be placed over the double sided sticky
tape and firmly attached by means of a gentle pressure applied by,
say, an operator's hand.
[0080] The present invention also provides means for ensuring that
the leading edge of the web of fabric (3), when mounted on the
roller blind tube (11), is cut straight and true, that is, that the
leading edge is cut parallel to the second direction and the
longitudinal axis of the roller blind tube (11) and perpendicular
to the first direction (A) and to the first component of the plane
of the planar surface of the alignment means (17a). The means for
ensuring that the leading edge is cut straight and true comprise a
cutting guide (29) which is in the appropriate alignment. In a
preferred embodiment of the invention, the cutting guide (29)
simply comprises a groove extending in the outer surface of the
roller blind tube (11) exactly parallel to the longitudinal axis of
the tube (11). Thus, when the roller blind tube (11) is mounted on
the mounting means (9a, 9b), cutting the leading edge of the fabric
with the guidance of the groove provides that the leading edge has
the desired alignment as set out above. The apparatus of the
invention may be provided with integral cutting means, but manual
cutting of the leading edge of the web of fabric (3) with a craft
knife is simple and effective. In use, the means (27) for attaching
the leading edge of the web of fabric to the roller blind tube
(such as the double-sided sticky tape) is disposed behind the
cutting guide (29) (with respect to the direction of rotation of
the roller blind tube (11)). The leading edge of the fabric (3) is
applied to the means for attaching the fabric (27) with an overlap
sufficient to ensure that the portion of the leading edge in front
of the means for attaching the fabric (27) overlies the cutting
guide (29). After the leading edge has been attached, the fabric
(3) is cut along the cutting guide (29) and the waste fabric is
disposed of.
[0081] An alternative arrangement for attaching the fabric (3) to
the roller blind tube (11a) is illustrated in FIGS. 11a and 11b.
The roller blind tube (11a) in these figures includes a relatively
wide longitudinal slot (31) with opposed retaining lips (33a, 33b).
A strip (35) of resilient material such as of plastic is held in
the slot (31) by the lips (33). As can be seen from FIG. 11b, the
leading edge of the fabric (3) is retained in the slot (31) around
the strip (35) without the use of any adhesive means.
[0082] A particular feature of the apparatus and method according
to the present invention is that the web of fabric (3) is cut by
the apparatus to a desired width (normally in accordance with the
length of a particular roller blind tube (11)) and that the
resulting side edges of the fabric are straight and true. That is,
the side edges are exactly parallel to each other and perpendicular
to the leading edge, after the leading edge has been cut with the
aid of the cutting guide. The apparatus of the invention is
provided with one or a plurality of width cutting means (13a, 13b)
(depending on the number of blinds being manufactured
simultaneously) to cut the side edges of the web of fabric (3). At
least one of the width cutting means (13a) is adjustable to
accommodate different desired widths of the final roller blind.
Most preferably, for the manufacture of a single blind, two width
cutting means are provided, one of which (13a) is fixed and the
other of which (13b) is adjustable. For the simultaneous
manufacture of more than one roller blind, preferably one
additional adjustable width cutting means (13a) is provided per
additional blind. Both or all the width cutting means (13) are
mounted on the apparatus so that their direction of cutting is
exactly parallel to the first direction and to the plane of the
planar surface of the alignment means (17) and exactly
perpendicular to the second direction and to the longitudinal axis
of the roller blind tube (11). The or each adjustable width cutting
means (13a) is most preferably moveable in a direction parallel to
the second direction and may be moveable independently of other
components of the apparatus. However, in one particularly
advantageous embodiment, the moveable width cutting means (13a) is
mounted in fixed relation to the adjustable roller blind tube
mounting means (9a). In the case of simultaneous manufacture of a
plurality of blinds, each adjustable width cutting means (13a) is
mounted in fixed relation to a corresponding adjustable roller
blind tube mounting means (9a',9a"). In a preferred embodiment of
the invention, the adjustable roller blind mounting means (9a, 9a',
9a") and the adjustable width cutting means (13a) are mounted on a
respective common bracket (23). As discussed above in relation to
the adjustable roller blind mounting means, the or each bracket
(23) is slideably mounted on a rail or bar (25). Any suitable
fabric cutting means (13) may, in principle, be used in the present
invention, including electric or pneumatic rotary scissors, but a
particularly preferred cutting means comprises a crush cutter in
the form of a suitable blade or wheel (37) having a cutting edge
bearing on one of the pinch rollers (preferably the upper pinch
roller) (see FIGS. 6 to 9). The respective cutting means (13) are
ideally provided with scrap fabric guides (39) (FIG. 12) to direct
the cut excess fabric away from the web of fabric which is to be
taken up on the roller blind tube (11).
[0083] Following cutting of the fabric, the web of fabric (3) must
be attached to a roller blind tube (11) and subsequently rolled up
on the tube (11). It is essential that the fabric (3) is mounted on
the roller blind tube (11) in exactly the correct alignment. That
is, the side edges of the fabric (3) must be maintained exactly
perpendicular to the axis of rotation of the roller blind tube
(11). If this is not done, the edges of the fabric (3) become
gradually offset from their proper location as the fabric is wound
on to the tube (11). In the prior art method, the alignment of the
fabric on the tube is judged largely by eye and involves aligning
the leading edge of the fabric parallel to the axis of the roller
blind tube. This requires considerable practice and skill and can
be a significant cause of error since only a small mis-alignment
can result in a significant off-setting of the fabric when wound
onto the roller blind tube (i.e. "coning" of the fabric). In the
present invention the or each adjustable width cutting means (13a)
is mounted on the bracket (23) so the line of action along which it
cuts (and hence the side edge of the fabric (3) when cut) is in
alignment with the edge of the end of the roller blind tube (11,
11', 11") which is mounted on the idle end mounting means (9a, 9a',
9a"), or is spaced a set distance from that end edge, normally not
more than a few millimetres. Where, as is preferred, the driven end
mounting means (9b) is fixed, the corresponding width cutting means
(13b) is also fixed (non-adjustable). The fixed width cutting means
(13b) is mounted on the apparatus so that the line of action along
which it cuts (and hence the side edge of the fabric (3) when cut)
is in alignment with the edge of the end of the roller blind tube
(11) which is mounted on the driven end mounting means (9b), or is
spaced a set distance from that end edge. The significant
operational advantage which derives from the constructions where
the adjustable width cutting means (13a) is in fixed relation to
the adjustable mounting means (9a, 9a', 9a"), is that the operator
does not need to make a separate adjustment of the adjustable width
cutting means (13a) in order to accommodate roller blind tubes (11)
of different lengths requiring correspondingly different widths for
the fabric web (3). This advantage applies equally to the
manufacture of a single blind or to the simultaneous manufacture of
more than one blind. This means that, for example, it is not
necessary for the operator to calculate the correct location of the
or each moveable width cutting means (13a) and adjust it
accordingly to achieve a desired width of cut fabric. Rather, the
simple act of mounting the roller blind tube or tubes (11) on the
roller blind tube mounting means (9a, 9a', 9a", 9b) automatically
sets the moveable width cutting means (13a) in the correct location
to achieve the desired width of fabric (3). Furthermore, the
alignment means (17), and the fact that the roller blind tube(s)
(11) is (are) mounted in fixed angular relation to the alignment
means (17), provides that the fabric (3) is automatically in the
correct alignment for mounting on the roller blind tube(s) (11),
with no operator adjustment of the correct alignment being
required.
[0084] It is advantageous for ensuring accurate cutting of the
fabric (3) to provide a degree of tension in the fabric (3) and the
apparatus of the invention provides the required tension
automatically by inter alia controlling the drive means (pinch
rollers 7a, 7b) for the web of fabric and also those (19) for the
driven end mounting means. In particular, the apparatus of the
invention provides a required degree of back tension. To this end,
the apparatus is provided with back tensioning means (41). One
example of a suitable back tensioning means (41) is known in the
art as a twitch bar and is illustrated in FIGS. 13 and 14. The
twitch bar (41) comprises a pair of parallel bars (43, 45) mounted
for rotation about an axis parallel to and located between the
respective bars (43, 45). Preferably the axes of the bars (43, 45)
and the axis of rotation lie in the same plane. The twitch bar (41)
is preferably disposed between the fabric cradle (1) and the
support surface (5). In use, with the parallel bars (43, 45) in an
approximately horizontal orientation (i.e. with both their
longitudinal axes lying approximately in the same substantially
horizontal plane), the web of fabric (3) is fed between the bars
and on to the support surface (5), so that the web of fabric (3) is
fed over the support surface (5) in the first direction. The twitch
bar (41) is then rotated through an appropriate angle, for example
about 135.degree., whereby one of the parallel bars (43) displaces
the fabric web (3) rearwardly (with respect to the first direction)
and the other of the parallel bars (45) displaces the fabric web
(3) forwardly. The fabric web (3) then follows a convoluted path
around the parallel bars (43, 45), preferably passing first around
the forwardly arranged bar (45) and passing in a generally rearward
direction (with respect to the first direction) and then around the
rearwardly arranged bar (43) so that the fabric (3) then moves in
generally the first direction. In a particularly preferred
arrangement, the back tensioning means (41) is provided with
alignment means (17b) for the fabric (3). The alignment means (17b)
of the back tensioning means (41) are disposed in exact alignment
with the alignment means (17a) of the support surface (5) and again
preferably comprises a planar surface disposed at one side of the
back tensioning means (41), the plane of said planar surface
including at least a component which is disposed exactly parallel
to the first direction. In order to guarantee the correct alignment
of the fabric web (3), the parallel bars (43, 45) of the twitch bar
(41) should be mounted with their longitudinal axes perpendicular
to the first direction and to the first component of the plane of
the alignment means (17a) of the support surface (5).
[0085] In order to maintain a desired tension in the fabric (3)
during cutting and rolling onto the roller blind tube (11), and
especially in order to maintain a desired substantially constant
tension, the drive means (19) for the roller blind tube (11) is
provided with a slipping clutch (47). Thus, if for some reason the
tension in the web of fabric (3) provided from the drive means (19,
7a, 7b) for the fabric exceeds a certain desired value, the
slipping clutch (47) will begin to slip, so that the tension in the
fabric (3) is maintained essentially at the desired value. Rolling
the fabric onto the roller blind tube (11) at the correct tension
is important in preventing coning of the fabric when the finally
produced blind is in use.
[0086] As mentioned above, the support surface is also preferably
provided with a cutting guide (15). This cutting guide (15) is used
to ensure accurate cutting of the fabric web (3) to form the
trailing edge of the fabric. The cutting guide (15) may also be
used, as an alternative to the cutting guide (29) on the roller
blind tube, to ensure accurate cutting of the fabric web (3) to
form the leading edge of the fabric. In a preferred and
advantageously simple arrangement, the cutting guide (15) comprises
a groove formed in the support surface (5). The groove is arranged
to be straight and exactly parallel to the axis of rotation of the
roller blind tube (11), hence also perpendicular to the first
direction and to the first component of the plane of the alignment
means (17a, 17b). In this way the trailing edge of the fabric (3)
can be cut straight and true. Specific trailing end cutting means
may be mounted on the apparatus of the invention to co-operate with
the cutting guide, but this is not necessary. Where the cutting
guide (15) is the groove as discussed above, the fabric (3) can
simply be cut by using a suitable craft knife which is guided by
the groove. Preferably means are provided to hold the fabric (3)
firmly in position while the trailing end is being cut. Such means
may be a clamping bar (49) aligned generally parallel to and close
to the line along which the trailing edge is to be cut. The
clamping bar (49) may, for example, be pneumatically operated.
[0087] The driving means for the roller blind tube mounting means
(19) may preferably be provided with a brake 51 which is used
towards the end of the process of rolling the web of fabric (3)
onto the roller blind tube (11), in order to improve the finish of
the trailing end of the fabric, as will be explained further
below.
[0088] Finally, the apparatus of the invention is most preferably
equipped with control means to automate at least some of the
operational steps of the apparatus, as will be indicated further
below.
[0089] The preferred processing steps using the preferred form of
apparatus of the invention are described below. The sequence of
steps indicated in this description is the preferred sequence, but
variations in this sequence are not excluded.
[0090] Firstly, a roller blind tube (11) having a length
appropriate to the desired width of the blind to be produced is
selected, and this roller blind tube (11) is mounted on the driven
end and idle end mounting means (9b, 9a). The roller blind tube
(11) maybe mounted in a desired rotational orientation with regard
to the position of the cutting guide or other suitable feature of
the tube, but as the tolerances allowed for the length of the
manufactured blind are usually generous, especially accurate
rotational orientation of the roller blind tube (11) is not
necessary. The position of the idle end mounting means (9a) is
adjusted as necessary to accommodate the particular length of the
roller blind tube (11). The idle end mounting means (9a) is then
locked in position which thereby sets the adjustable cutting means
(13a) in its correct location. The body of fabric (3a) is placed in
the fabric cradle (1) and fed through the back tensioning means
(twitch bar) (41) and on to the support surface (5). The edge of
the web of fabric (3) is aligned with the alignment means (17a) of
the support surface (5) and with the alignment means (17b) the
twitch bar (41) and the twitch bar (41) is then rotated to
introduce back tension into the fabric web (3).
[0091] The control means is then used to commence operation of the
drive means (pinch rollers (7a, 7b)) and if the facility is
provided to move the cutting means (13a, 13b) from a disengaged to
an engaged position (i.e. where the crush cutters bear against the
pinch roller (7a)). While checking and maintaining the alignment of
the fabric (3) with the alignment means (17a, 17b), the leading
edge of the web of fabric (3) is then fed through the pinch rollers
(7a, 7b) and around the upper pinch roller (7a), where it meets the
cutting means (13a, 13b) so that cutting of the fabric to the
desired width begins. From the pinch rollers (7a, 7b), the leading
edge of the fabric is guided manually to the mounted roller blind
tube (11). When a sufficient length of fabric has been obtained,
the control means is used to stop the drive means (7a, 7b) and the
leading end of the fabric (3) is mounted on the roller blind tube
(11) using suitable attachment means (27)--such as double-sided
sticky tape--as discussed above.
[0092] While mounting the fabric web (3) on the roller blind tube,
a suitable tension in the portion of the fabric between the leading
edge and the pinch rollers (7a, 7b) is maintained manually. When
the leading end of the fabric web has been mounted on the roller
blind tube (11), the leading edge is cut straight and true using
the cutting guide (29) in the roller blind tube (11) and a suitable
knife.
[0093] After ensuring that the scrap fabric portions produced by
the cutting means are fed correctly through the scrap fabric guides
(39), the control means can be programmed with the type and
required length (or "drop") of the blind. The control means then
starts the fabric drive means (7a, 7b) and the drive means (19) for
the roller blind tube mounting means, so that the fabric web (3)
continues to be cut and the cut fabric web (3) is taken up onto the
roller blind tube (11) in the correct alignment and with the
required tension. After an interval of time calculated by the
control means in accordance with the required drop of the blind,
for example on the basis of a calculated number of rotations of the
pinch roller (or alternatively, of the roller blind tube), the
control means stops the respective drive means (7a, 7b, 19). The
point at which the drive means (7a, 7b, 19) are stopped is
calculated by the control means so that the cutting guide (15) in
the support surface (5) corresponds to the line along which the
fabric web (3) should be cut to form the trailing edge.
[0094] Either at the instigation of the operator or of the control
means, the clamping means (49) is moved to its clamping position
and the fabric web (3) is cut by the operator along the cutting
groove (I5) in the support surface (5). The clamping means (49) is
then moved from its clamping position.
[0095] The control means (if necessary as a result of an
instruction input by the operator) then re-starts the drive means
(7a, 7b, 19) so that most of the remainder of the fabric web (3) is
taken up onto the roller blind tube. Towards the end of the
process, the control means causes application of the brake for a
short duration (which may be as little as one revolution) of the
roller blind tube (11). From this point onwards, it is preferred
that the operator applies a light pressure to the fabric wound on
the roller blind tube (11), in order to maintain the tension of the
fabric. By applying the brake, the tension in the fabric (3) at the
point at which the cutting means are cutting the fabric is released
or lessened. The point of application of the brake is selected to
correspond with the time at which the trailing end of the fabric is
passing the cutting means (13a, 13b). In this way, the fabric (3)
towards the trailing end is cut straight and true (i.e. parallel to
the first direction) and the problem of splaying of the end of the
fabric is avoided. When all of the fabric has been rolled onto the
roller blind tube, the trailing end can be secured with a piece of
sticky tape in order to maintain the tension of the fabric. The
roller blind can now be finished on the table if desired or the
roller blind tube carrying the fabric can then be dismounted and
sent for packing or such final finishing stages as might be
required.
[0096] Where the apparatus of the invention is modified to
manufacture more than one blind simultaneously, the first roller
blind tube (11') is mounted as described above. When the first
modified idle end mounting means (9a') has been set in position the
second roller blind tube (11") is mounted on the second side of the
first modified idle end mounting means (9a'). A second modified
idle end mounting means (9a") is then adjusted to a position for
mounting the second end of the second roller blind tube (11").
Alternatively, if the apparatus is constructed to accommodate more
than two roller blind tubes, further modified idle end mounting
means (9a") and roller blind tubes (11") are added to mount the
respective ends of the roller blind tubes, ending with the second
modified idle end mounting means (9a") at the second end of the
final roller blind tube.
* * * * *