U.S. patent application number 12/491475 was filed with the patent office on 2010-12-30 for transformable structure for producing a multi thread single line stitch and method and machine for its realization.
Invention is credited to Askar Dzhamilevich Mingazhev, Bruce Alan Pelkey.
Application Number | 20100326341 12/491475 |
Document ID | / |
Family ID | 43379338 |
Filed Date | 2010-12-30 |
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United States Patent
Application |
20100326341 |
Kind Code |
A1 |
Mingazhev; Askar Dzhamilevich ;
et al. |
December 30, 2010 |
TRANSFORMABLE STRUCTURE FOR PRODUCING A MULTI THREAD SINGLE LINE
STITCH AND METHOD AND MACHINE FOR ITS REALIZATION
Abstract
A multi-thread single-line chain stitch line, consisting of at
least three threads. This method provides for the formation of
variable structures of stitches, based on varying sequences for the
conjoining of several top threads, loaded to their individual
needles, with several bottom threads, loaded to their individual
loopers. The method suggests intertwining top threads between each
other. The proposed stitch structure provides homogeneity of
mechanical stresses in the stitch line, resulting in higher
strength and durability. The machine to provide such stitch line
comprises a revolver, bringing required needles to the operation
point and intertwining threads during formation of the stitch line,
and likewise comprising a revolver for bringing required loopers to
the operation point. In one of the embodiments of the present
invention, only three top threads are used, with the looper having
no bottom thread loaded in it.
Inventors: |
Mingazhev; Askar Dzhamilevich;
(Ufa, RU) ; Pelkey; Bruce Alan; (Bakersfield,
CA) |
Correspondence
Address: |
Bruce A. Pelkey
Post Office Box 812
Bakersfield
CA
93302
US
|
Family ID: |
43379338 |
Appl. No.: |
12/491475 |
Filed: |
June 25, 2009 |
Current U.S.
Class: |
112/166 ;
112/199; 112/475.17 |
Current CPC
Class: |
D05B 57/02 20130101;
D05B 1/08 20130101 |
Class at
Publication: |
112/166 ;
112/199; 112/475.17 |
International
Class: |
D05B 1/08 20060101
D05B001/08; D05B 57/02 20060101 D05B057/02 |
Claims
1. Manufacturing of a multi-thread single-line chain stitch line,
consisting of at least three threads, which threads are conjoined
at the material perforation points in a pre-determinable sequence,
which sequence is variable along the stitch line, which effect is
obtained by utilizing a pre-determinable sequencing program for
conjoining the threads, and which program is determined by the
desired structure of the stitch line.
2. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 1, consisting of at least two top threads and
at least one bottom thread, where said top threads on the top side
of the material are independent of each other and/or intertwined
between each other (as shown in FIG. 1).
3. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 2, where said desired structure includes n
number of top threads (3a, 3b . . . 3x), where n=2 . . . 20, and m
number of bottom threads (4a, 4b . . . 4x), where m=1 . . . 20, as
shown in FIG. 2 (on which figure: top threads 3a, 3b-n=2, and
bottom threads 4a, 4b-m=2).
4. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 2, where each top thread is loaded into its
individual needle and each bottom thread is loaded into its
individual looper.
5. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 4, using a means for sequentially enabling a
required needle and another means for sequentially enabling a
required looper simultaneously, providing for the conjunction of
one of the top threads with one of the bottom threads; said
required needle and said required looper forming a current couple;
wherein said current couple is chosen by said pre-determinable
sequencing program.
6. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 5, by using a means for providing a desired
number of cycles, where each cycle consists of the following steps
(FIG. 3): After bringing a current couple into the operating
position: A--passing of the top thread (3a) through material (1) by
the needle (5a); passing the loop of the bottom thread (4a) by the
looper (6a) through the loop of the top thread (3a); B--extracting
needle (5a) out of material (1) engaging the top thread (3a) loop
by looper (6a); C--shifting material (1) to extend the bottom
thread (4a) loop to the next perforation point; D--passing of the
top thread (3b) through material (1) by the needle (5b), further
passing the needle (5b) with the top thread (3b) through the bottom
thread (4a) loop; E--passing of the bottom thread (4a) by looper
(6a) through the top thread (3b) loop and extracting needle (5b)
out of material (1).
7. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 6, where such means for enabling said required
needle is a needle revolver; said needle revolver having needle
bars located along said needle revolver's periphery and oriented
along its rotation axis.
8. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 7, where said needle revolver provides an
action for intertwining said top threads between each other.
9. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 8, where such means for enabling said required
looper with one of the bottom threads is a looper revolver, which
has said loopers located along the periphery of said looper
revolver.
10. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 9, where said looper revolver provides a means
for intertwining said bottom threads between each other.
11. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 8, where said current couple is formed by one
of said needles and a single looper with one bottom thread loaded
in it.
12. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 1, consisting of at least three top threads,
each top thread forming a loop at the material perforation point in
a pre-determinable sequence, said loop being conjoined with the
next loop at the next perforation point by means of a looper; no
thread being loaded in said looper; said top threads being loaded
in their individual needles; said individual needles being enabled
in said pre-determinable sequence, which sequence is variable along
the stitch line; and where said pre-determinable sequence is
determined by said pre-determinable sequencing program.
13. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 12, wherein said desired structure includes n
number of top threads (3a, 3b . . . 3x), where n=3 . . . 20 and
wherein said top threads on the top side of the material are
independent of each other and/or intertwined between each other (as
shown in FIG. 5).
14. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 12, by use of a means for providing a desired
number of cycles, where each cycle consists of the following steps
(FIG. 6): A--After bringing one of said needles (5a), with one of
said top threads (3a), into the operating position for said cycle:
passing of the thread (3a) through material (1) to be sewn by
needle (5a); engaging the thread (3a) by the looper (6a) under
material (1); B--Extracting needle (5a) out of material (1) and
shifting said material (1) to provide extension of the thread (3a)
to the next perforation point, forming the thread (3a) loop;
C--Bringing one of said needles (5b), with one of said top threads
(3b), into the operating position for said cycle; D--Passing of the
thread (3b) through material (1) by needle (5b) and passing the
thread (3b) loop through the thread (3a) loop by the looper (6a);
engaging the thread (3b) by the looper (6a) under material (1);
E--Extracting needle (5b) out of said material (1) and shifting
material (1) to extend the thread (3b) to the next perforation
point, forming the thread (3b) loop; and F--Bringing needle (5c),
with one of said top threads (3c), into the operating position for
said cycle; passing of the thread (3c) through material (1) by
needle (5c) and passing the thread (3c) loop through thread (3b)
loop by looper (6a).
15. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 14, where such means for enabling said required
needle is a needle revolver; said needle revolver has needle bars
located along said needle revolver's periphery and oriented along
its rotation axis.
16. Manufacturing of a multi-thread single-line chain stitch line,
as claimed in claim 15, where said needle revolver provides an
action for intertwining said top threads between each other.
17. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, wherein at least three threads are used, said
sewing machine basically comprising a means for sequentially
enabling a required needle, at least one looper, a feed mechanism
to feed material to be sewn, a drive mechanism to drive said means
for sequentially enabling a required needle, the looper and the
feed mechanism, and further comprising a means for synchronization
thereof, said sewing machine providing a means for conjoining said
threads at the material perforation points in a pre-determinable
sequence, which sequence is variable along the stitch line, which
sequence is obtained by utilizing a pre-determinable sequencing
program for conjoining the threads.
18. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 17, wherein at least two top
threads and at least one bottom thread are used, and each said top
thread is loaded into its individual needle and each said bottom
thread is loaded into its individual looper, said needles and said
looper or loopers comprising said means for conjoining said
threads.
19. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 18, comprising such means
for sequentially enabling said required needle with one of the top
threads and another means for sequentially enabling a required
looper with one of the bottom threads simultaneously, providing for
conjunction of one of the top threads with one of the bottom
threads; said required needle and said required looper forming a
current couple; wherein said current couple is chosen by
pre-determinable sequencing program.
20. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 19, wherein such means for
enabling said required needle is a needle revolver; said needle
revolver has needle bars located along said needle revolver's
periphery and oriented along its rotation axis; and said needle
revolver provides an action for intertwining said top threads
between each other.
21. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 20, where such means for
enabling said required looper with one of the bottom threads is a
looper revolver, which has said loopers located along said looper
revolver's periphery.
22. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 20, where said current
couple is formed by one of said needles and a single looper with
one bottom thread loaded in it.
23. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 17, with at least three top
threads being loaded into their individual needles, no thread being
loaded in said looper; said individual needles being enabled in
said pre-determinable sequence, which sequence is variable along
the stitch line; and wherein said pre-determinable sequence is
determined by said pre-determinable sequencing program.
24. A sewing machine for manufacturing a multi-thread single-line
chain stitch line, as claimed in claim 23, where such means for
enabling said required needle is a needle revolver; said needle
revolver has needle bars located along said needle revolver's
periphery and oriented along its rotation axis.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND
DEVELOPMENT
[0002] Not applicable.
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
[0003] 1. Field of the Invention
[0004] The present invention relates to the manufacture of
equipment for sewing technologies and methods for the sewing
industry, the embroidered goods industry, the knitted goods
industry, the leather industry and the shoe industry. The present
invention comprises a technology for obtaining a multi-thread
single-line chain stitch line.
[0005] 2. Description of Prior Art and Existing Problems
[0006] Existing at present, chain stitch lines (presented in U.S.
Pat. Nos. 3,301,206; 3,753,410) have a limited number of threads
(two threads only) being used in the line, and are limited in the
variability of the structure of the stitch, which in turn limits
the possibilities for adjusting the stitch line structure to the
operational requirements. Likewise, the existing machines,
manufacturing two-thread single-line chain stitch lines, have
limited functional possibilities (as presented in U.S. Pat. Nos.
3,301,206; 3,753,410; 6,095,069).
[0007] The limited number of threads being used in the prior art
strongly hinders the potential for changes in the parameters of the
stitch, which are limited to changing the step of the stitch and
the thread tension.
[0008] The contemporary chain stitch line used in sewing knitted
goods is not very reliable, and tends to deform the seam, causing
corrugation, which creates the appearance of a defect in the
finished product.
[0009] Another problem in sewing technology is the optimization of
stitch line properties along its length. The loads to which the
stitch is exposed are different in different areas of a sewn
article. In addition, the conditions of the stitch line operation
are different, whereas the stitch line remains uniform along its
length under the existing technology. For example, an article, such
as a sleeve, is subject to various deformations in different
areas--stretching at the elbow and corrugation at the bend. Also,
the uniform stitch line often joins several layers of material,
while the materials can be of different type (woven fabric, knitted
fabric, leather, etc.). Thus, although the average properties of
the uniform stitch line are intended to cover variable
requirements, such factors ultimately limit the technological
possibilities for creating new goods without the existing
difficulties.
[0010] Further, the existing chain stitch structure results in
uneven deformation under stretching, where alternating stretched
and squeezed areas are created (stretched areas occur around the
perforation in the material, i.e. in the point of conjunction of
the top and bottom threads, while the squeezed areas occur in the
interval between two perforations). Such uneven deformation of the
seam causes corrugation.
[0011] Known stitch lines provide stretch ability due to the
stretch ability of the threads used in the line and deformation of
the sewn material.
[0012] Thus, the main drawbacks of the contemporary single-line
chain stitch line, which limit its application and degrade its
operational properties and appearance of the finished product, are
as follows: [0013] 1. Poor functional properties, which cannot be
optimized along the stitch line length, especially under conditions
of complicated design and variable operating conditions; [0014] 2.
Seam corrugation in the operation process; [0015] 3. Low ability to
stretch; and [0016] 4. Limitations in controlling the stitch
line/seam properties.
[0017] The aim of the present invention is a further improvement in
the class of the chain stitch, due to the elimination of the
drawbacks described above, by using the following principles:
[0018] 1. The elimination of corrugations due to mutual
compensation of stretch and compression zones, based on the
structure of the stitch; [0019] 2. Increased stretch ability of the
stitch line by replacing a rigid bond in the interval between
perforations with a flexible one; [0020] 3. The introduction of
duplicating bonds, thereby increasing the reliability of the stitch
line; [0021] 4. Variability of the stitch structure, by varying the
sequence in the conjunction of the top and bottom threads, which
allows a change in the structure of the stitch along the length of
the stitch line for the optimization of the operational properties
of the seam in its different areas; and [0022] 5. Improved
reliability of the stitch line due to intertwined top threads
and/or intertwined bottom threads.
[0023] These and other objects and advantages of this invention are
described in detail in the description of the invention contained
herein.
BRIEF SUMMARY OF THE INVENTION
[0024] The present invention comprises variations in the
manufacturing of chain stitch lines, with at least three threads
involved, according to two main versions: one version consisting of
top and bottom threads, which threads are conjoined at the material
perforation points; and another version consists of top threads
only.
[0025] In the first version, the top threads are joined with the
bottom ones in a pre-determinable sequence, variable along the
stitch line. This effect is obtained through the following: [0026]
1. By utilizing a pre-determinable sequencing program for
conjoining the top and the bottom threads. The program is
determined by the desired structure of the stitch line. [0027] 2.
By the fact that each top thread is loaded into its own needle and
each bottom thread into its own looper. [0028] 3. By a means for
sequentially engaging a required needle and of another means for
sequentially engaging a required looper simultaneously, providing
for conjunction of one of the top threads with one of the bottom
threads. A revolver can be used for such means in both cases. Such
revolver has needle bars located along its periphery and oriented
along its rotation axis, and the other revolver has loopers located
along its periphery. Both revolvers are equipped with devices,
providing for enabling the desired needle-looper couple, which will
hereafter be called a "current couple." [0029] 4. By a means for
intertwining the top threads between each other and a means for
intertwining the bottom threads between each other (as referenced
below).
[0030] The considered stitch line structure consists of a system of
several top and several bottom threads joined through the
perforations in the material. Such structure provides for a mutual
compensation of stretched and squeezed areas of the material and
eliminates corrugation of the seam. Another benefit is the
potential for changing or transforming the structure along the
length of the stitch line in the process of producing the stitch
line. It permits the optimization of the properties of the seam in
terms of its appearance, stretch ability, wear resistance, etc.
[0031] The sequence of interaction of the top and the bottom
threads is determined by the required structure of the stitches.
The sequence of interaction can be controlled mechanically or
digitally. These methods of control and programming are well known
and widely used--e.g., in knitwear fabrics manufacturing (U.S. Pat.
Nos. 4,467,737 and 4,359,953).
[0032] The loading of every top thread into its needle and of every
bottom thread into its looper can be provided by various methods
used in conventional multi-thread sewing machines (U.S. Pat. Nos.
3,433,191 and 4,993,335).
[0033] A means for sequentially engaging a required needle and a
means for sequentially engaging a required looper simultaneously,
providing for the conjunction of one of the top threads with one of
the bottom threads, is not known from the prior art. Such means
could be provided in various ways. One of the ways is taught in the
present invention. It comprises a needle unit (mechanism) and a
looper unit (mechanism).
[0034] The needle unit comprises a revolver (needle revolver) with
needle bars located along its periphery and oriented along its
rotation axis. The looper unit also comprises a revolver (looper
revolver), where the loopers are similarly located along its
periphery. Both revolvers are equipped with a device which provides
for enabling the current couple. Both revolvers are also provided
with a means for turning and fixation. A Geneva wheel can be used
for such purpose. (A Geneva wheel is a well-known mechanism in
sewing machines; see, e.g., U.S. Pat. No. 4,702,183).
[0035] The utilization of both revolvers, due to the rotation of
the needles and the loopers around the rotation axes of the
respective revolvers, can provide for the respective intertwining
of the top threads between each other and of the bottom threads
between each other.
[0036] The second basic version of the present invention implies a
multi-thread single-line chain stitch line, consisting of at least
three top threads, each top thread forming a loop at the material
perforation point in a predetermined sequence, such loop being
conjoined with the consequent loop at the consequent perforation
point by means of a looper, with no thread being loaded in the
looper.
DETAILED DESCRIPTION OF THE INVENTION AND DESCRIPTION OF THE
DRAWINGS
[0037] The present invention can be easily understood from the
detailed description of the preferred embodiment by reference to
the attached drawings.
[0038] FIG. 1: This represents a general view of the structure of a
multi-thread single-line chain stitch line (one of the possible
embodiments) in the formation process. The structure is obtained
due to the alternating connection of each top thread with the
bottom thread through perforations (2) in the material (1) with
intertwining (7) of the top threads (3a, 3b). Top threads (3a, 3b)
are loaded into corresponding needles (5a, 5b), and the bottom
thread (4a) is loaded in the looper (6a). Loops of the top threads
(3a, 3b) engage with the bottom thread (4a). With the rotation of
the needles (5a, 5b) at the angular speed of revolver rotation
(.omega.) the intertwining of the threads (7) is obtained.
[0039] FIG. 2: Structure of a four-thread chain stitch line
comprised of two top threads (3a, 3b) and two bottom threads (4a,
4b).
[0040] FIG. 3: For better understanding the main steps in the
formation of a multi-thread single-line chain stitch line, both top
threads (3a, 3b) and the bottom thread (4a) are drawn at different
levels for easier identification.
[0041] After bringing a current couple into the operating
position:
[0042] A--passing of top thread (3a) through material (1) by a
needle (5a); passing the loop of the bottom thread (4a) by the
looper (6a) through the loop of the top thread (3a);
[0043] B--extracting needle (5a) out of material (1) engaging top
thread (3a) loop by looper (6a);
[0044] C--shifting material (1) to extend the bottom thread loop
(4a) to the next sequential perforation point;
[0045] D--passing of top thread (3b) through material (1) by a
needle (5b), further passing the needle (5b) together with the top
thread (3b) through the bottom thread (4a) loop;
[0046] E--passing of bottom thread (4a) by looper (6a) through the
top thread (3b) loop and extracting needle (5b) out of material
(1).
[0047] FIG. 4: For better understanding the main steps in the
formation of a multi-thread single-line chain stitch line, the two
top threads (3a, 3b) and the two bottom threads (4a, 4b) are drawn
at different levels for easier identification.
[0048] After bringing a current couple into the operating
position:
[0049] A--Passing of top thread (3a) through material (1) at
perforation (p#1), by required needle (5a); engaging top thread
(3a) by required looper (6a) with passing bottom thread (4a) into
the top thread (3a) loop; thus forming the bottom thread (4a) loop
inside of the top thread (3a) loop;
[0050] B--Extracting required needle (5a) out of material (1) at
(p#1) and shifting material (1) to stretch the top thread (3a) loop
by means of looper (6a); with this, the next current couple--needle
(5b) and looper (6b)--provides interaction of top thread (3b) and
bottom thread (4b); for which needle (5b) brings top thread (3b)
through material (1) at (p #2), and looper (6b) brings thread (4b)
through thread (3b) loop.
[0051] C--Shifting material (1) again; bringing needle (5a), which
is another required needle, with the top thread (3a), which is
another required thread, into the operating position for said
cycle, forming another current couple with the looper (6a); with
this, looper (6a) stretches thread (3a) loop to the area of the
next perforation (p#3); needle (5a) brings thread (3a) through
perforation (p#3) and provides interaction of thread (3a) loop by
means of looper (6a) with threads (3a) and (4a); with this looper
(6b) stretches thread (3b) loop.
[0052] D--Thread (3a) loop stretches thread (4a) forming an element
of the stitch.
[0053] E--Looper (6a) brings thread (4a) through thread (3a) loop;
with this, the next current couple (5b) and (6b) is being
prepared.
[0054] F--Material (1) is shifted; with this, thread (3b) loop is
stretched by looper (6b) to the area of perforation (p#4); whereas
needle (5b) is bringing thread (3b) through perforation (p#4),
providing interaction of thread (3b) loop with thread (4b).
[0055] G--Thread (3b) stretches thread (4b) loop to the area of
perforation (p#2) forming another element of the stitch.
[0056] H--Looper (6b) brings thread (4b) through thread (3b) loop;
with this, the next current couple (5a) and (6a) is formed.
[0057] I--Material (1) is shifted; looper (6a) stretches thread
(3a) loop to the area of perforation (p#5), looper (6b) stretches
thread (3b) loop as well; needle (5a) brings thread (3a) through
perforation (p#5) and thread (4a) loop.
[0058] J--Looper (6a) throws off thread (4a) loop on needle (5a)
and thread (3a).
[0059] K--Looper (6a) brings thread (4a) through thread (3a) loop;
with this, the next current couple (5b) and (6b) is being formed,
and the material (1) is prepared to be shifted with further
repetition of the cycle described in A-G.
[0060] (Note: If intertwining is required, after each extraction of
the needle the needle revolver rotates the required number of
revolutions to provide intertwining).
[0061] FIG. 7: Sewing machine--front view.
[0062] FIG. 8: Sewing machine--axonometric view.
[0063] FIG. 9: Needle revolver.
[0064] FIG. 10: Needle revolver consisting of two needle modules
(16a, 16b) and module mounting device (modular needle revolver)
(22).
[0065] FIG. 11: Needle module.
[0066] FIGS. 1-11 disclose: 1--sewn material; 2--perforation; (p#1,
p#2, p#3, p#4, p#5--numbers of perforations); 3a--first top thread;
3b--second top thread; 3c--third top thread; 4a--first bottom
thread; 4b--second bottom thread; 5a--first top thread needle;
5b--second top thread needle; 5c--third top thread needle;
6a--first bottom thread looper; 6b--second bottom thread looper;
7--thread intertwining; 8--needle unit (needle revolver); 9--looper
unit (looper revolver); 10--mechanism for discrete rotation of the
needle revolver (e.g. Geneva wheel); 11--mechanism for discrete
rotation of the looper revolver (e.g. Geneva wheel); 12--needle bar
(12a--first needle bar; 12b--second needle bar); 13--needle bar
engaging mechanism; 14--needle bar catching device; 15--needle bar
shoulder (15a--first needle bar shoulder; 15b--second needle bar
shoulder); 16a--module of needle and thread feeder mechanism of the
first needle; 16b--module of needle and thread feeder mechanism of
the second needle; 17--bobbin holder with bobbin; 18--thread
tension regulator; 19--thread take-up; 20--thread take-up eye;
21--thread take-up drive; 22--module mounting device; 23--shaft;
24--drum; 25--module housing; 26--needle unit housing;
.omega.--angular speed of revolver rotation.
[0067] The process of forming stitch lines according to the present
invention can be performed by the following mechanisms and devices.
The mechanism of discrete rotation of the needle revolver (10)
turns needle unit (needle revolver) (8), bringing desired needle
(e.g., 5a) into operating position; simultaneously, the mechanism
of looper revolver discrete rotation (11) brings the desired looper
(e.g., 6a) into operating position; thus, the current couple of
needle (5a) and looper (6a) is enabled. With this, catching device
(14) of mechanism (13) catches shoulder (15a), thus enabling needle
bar (12a).
[0068] The sewing machine can be designed with: [0069] solid needle
revolvers (FIG. 9); [0070] interchangeable revolvers having
different numbers of needles and loopers; and with [0071] needle
revolvers (modular needle revolvers) consisting of a
module-mounting device (22) and the desired number of needle
modules (16) (see FIG. 10 and FIG. 11).
[0072] The solid needle revolver (FIG. 9) is comprised of a
cylindrical drum (24), which is driven by a rotation mechanism to
make discrete rotations (10) via a shaft (23). Each needle (5) is
supplied with individual needle bars (12), bobbin holders (17),
thread tension regulators (18), and thread take-ups (19). The
motion of the thread take-up eye (20) is synchronized with the
needle bar (12) via the thread take-up drive (21).
[0073] The modular needle revolver (FIG. 10 and FIG. 11) can be
designed for various module-mounting device capacities. Modules
(16) are mounted on a module-mounting device (22), which is
connected to the mechanism which provides for discrete rotation of
the needle revolver (10). All operations are similar to the ones of
the above-described solid needle revolver (FIG. 6).
[0074] The module (FIG. 11) is comprised of the casing (25)
enclosing the needle bar (12) connected via the thread take-up
drive (21) with the thread take-up (19). The casing (25) has a
bobbin holder with bobbin (17) and thread tension regulator (18).
The thread take-up drive (21) may be designed, for example, as a
gear kit, transforming the motion of cogs on the needle bar (12)
and the thread take-up (19).
[0075] The novelty of the present invention is in obtaining various
and variable structures of chain stitch lines due to a
pre-determinable conjunction of several top and several bottom
threads. In the conventional chain stitch sewing machines, many
methods are known for manufacturing conventional chain stitch
lines. All of them are applicable to this invention with
modification, providing for the individual interaction of needles
and loopers, forming current couples.
[0076] While this invention has been described in terms of a
specific embodiment thereof, it is to be understood that it is not
limited thereto, but rather only to the extent set forth hereafter
in the claims, which follow.
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