Sewing – Stitch forming – Multiple needle
Reexamination Certificate
1998-11-23
2001-10-23
Izaguirre, Ismael (Department: 3741)
Sewing
Stitch forming
Multiple needle
C112S168000, C112S260000
Reexamination Certificate
active
06305304
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a two-needle sewing machine which drives two needles simultaneously to thereby execute a sewing operation and, in particular, such two-needle sewing machine suitable for use as a belt loop sewing machine which sews a belt loop on a workpiece.
Conventionally, as an example of a two-needle sewing machine, there are proposed various types of belt loop sewing machines each of which is used to sew a plurality of belt loops to be inserted through a belt onto the waist portions of various workpieces (things to be sewn) such as jeans, pants, skirts and the like.
Here,
FIGS. 7 and 8
show an example of the above-mentioned conventional belt loop sewing machines, which is disclosed, for example, in U.S. Pat. No. 5,588,384. In particular, the conventional belt loop sewing machine
1
comprises a sewing machine main body
2
serving as sewing means, as well as a belt loop forming device
3
and a belt loop supply device
4
which are respectively added to the sewing machine main body
2
.
The sewing machine main body
2
is formed of, for example, a two-needle cycle sewing machine. In the interior portion of a sewing machine arm
6
that is located on the free end side (in
FIG. 7
, on the left side) thereof, there is disposed a needle rod drive mechanism
21
(
FIG. 8
) which is connected in such a manner as to be able to move a needle rod
8
up and down in linking with the upper shaft
22
(
FIG. 8
) of the sewing machine. To the lower end of the needle rod
8
, there is fixed a needle stopper
8
a
, while two parallel arranged needles
7
and
7
are respectively fixed to the needle stopper
8
a.
Also, downwardly of the sewing machine arm
6
, there is disposed a long and narrow sewing machine bed
5
in such a manner that it extends in parallel to and is opposed to the sewing machine arm
6
. On the upper surface of the sewing machine bed
5
, there is disposed a needle plate
9
including needle holes
9
a
through which the needles
7
can be inserted. And, at the vertically moving positions of the needles
7
, there are provided a pair of hold feet
10
in such a manner that the hold feet
10
can be pressure contacted with the upper surface of the needle plate
9
due to an elastically energizing force to thereby hold a cloth S between them. The hold feet
10
and
10
are supported by a known cloth hold device (not shown) in such a manner that it can be moved up and down with respect to the needle plate
9
.
At the vertically moving positions of the needles
7
in the interior portion of the sewing machine bed
5
, there are disposed a pair of known vertical hooks
27
a
and
27
b
which respectively include therein bobbins with lower threads wound therearound and cooperate together with the needles
7
in forming stitches. And, the vertical hooks
27
a
and
27
b
can be rotated in linking with lower shafts
26
a
,
26
b
,
26
c
,
26
d
(
FIG. 8
) which are respectively connected to the above-mentioned upper shaft.
In the belt loop sewing machine
1
, generally, an operator works on the free end side of the sewing machine arm
6
and, for the sake of convenience, in
FIG. 7
, the free end side of the sewing machine arm
6
is expressed as FS, whereas the opposite side thereof is expressed as BS. In one side portion of the fee end side FS of the sewing machine main body
2
, there are arranged the above-mentioned belt loop forming device and belt loop supply device
4
.
The belt loop forming device
3
not only sends out a long loop material
12
for forming a belt loop along the longitudinal direction of the sewing machine main body
2
toward the FS side thereof by a supply source (not shown) disposed on the BS side of the sewing machine main body
2
but also cuts the loop material
12
into a given length to thereby form a belt loop.
That is, a loop send-out base
13
is disposed almost parallel to the sewing machine bed
5
, and a disk-shaped cloth send gear
14
, which serves as loop send-out means, with send teeth
15
formed on the outer peripheral surface thereof is disposed on the upper portion of the loop send-out base
13
. In operation, the cloth send gear
14
is contacted with the upper surface of the loop material
12
, which is shown by an imaginary line in
FIG. 7
, supplied onto the loop send-out base
13
, and, due to the rotation of the cloth send gear
14
when it is driven by a loop send-out motor (not shown), the loop material
12
is sent out by a given amount toward a supply position which is set on the FS side.
Downstream of the loop send-out base
13
in the send direction, i.e. in the direction of an arrow B shown in
FIG. 7
, of the loop material
12
, there is disposed cutting means
16
which is used to cut the loop material
12
into a given length. The cutting means
16
comprises a fixed blade which is fixedly mounted downwardly of the passage of the loop material
12
, and a movable blade which is normally situated upwardly of the passage of the loop material
12
and can be moved down by cutting drive means (not shown) such as a cylinder or the like so as to be able cooperate together with the fixed blade in cutting the loop material
12
.
Downstream of the cutting means
16
in the send direction, i.e. in the arrow B direction in
FIG. 7
, of the loop material
12
, that is, at the supply position, there are disposed a pair of front and rear loop receiver members
17
which are used to support the cut formed belt loop having a given length, while the loop receiver members
17
are respectively formed in an L-like shape in which the leading end thereof is bent upwardly from below the belt loop. Also, between the two loop receiver members
17
, there is interposed a guide rod
19
which is bent downwardly from one end side of the belt loop into an L-like shape. The guide rod
19
is used to hold the position of the loop material
12
sent to the supply position at a given position, while the guide rod
19
is also referred to as a loop move-up rod. That is, since the guide rod
19
moves up the side surface of the loop material
12
to a given position to thereby arrange the loop material
12
in order, when the two ends portions of the belt loop cut to a given length are bent by forks
20
, the bent portions are prevented from shifting in position and can be overlapped together completely.
Now, the belt loop supply device
4
not only holds the two ends neighboring portions of the belt loop having a given length held at the supply position by the two loop receiver members
17
, but also bends the two ends neighboring portions and then delivers the thus treated belt loop to a sewing position. The belt loop supply device
4
includes a pair of right and left forks
20
which are structured such that, after they hold between them the two ends neighboring portions of the belt loop having a given length held at the supply position by the two loop receiver members
17
, they bend the two ends neighboring portions by 180 degrees in a downwardly folding manner, and, after then, they deliver the belt loop to the sewing position. Also, the respective leading end portions
20
a
of the two forks
20
, as shown in
FIG. 7
, are normally situated at their respective retreat positions which are spaced to the right apart from the supply position, while the leading end portions
20
a
can be rotated as well as advanced and retreated by fork drive means such as an air cylinder or the like.
According to the conventional belt loop sewing machine having the above-mentioned structure, at first, the loop material
12
is sent out to the supply position from the upper surface of the loop send-out base due to the rotational movement of the cloth send gear
14
and is supported from below by the two loop receiver members
17
and, at the same time, the thus sent-out loop material
12
is moved up and is thereby arranged to one side by the guide rod
19
. Next, the two forks
20
are advanced toward the BS direction from the retreat position to the supply position and the leading end portions
20
a
of th
Hirose Noriyuki
Kazehare Hiroyuki
Kitada Kenji
Maeda Akira
Tanaka Makoto
Izaguirre Ismael
Juki Corporation
Morgan & Finnegan , LLP
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