Sewing – Special machines – Elongated article
Reexamination Certificate
1999-08-03
2001-05-01
Nerbun, Peter (Department: 3741)
Sewing
Special machines
Elongated article
Reexamination Certificate
active
06223667
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a belt-loop sewing machine which is capable of efficiently supplying a belt loop to a sewing position.
2. Description of the Related Art
As disclosed in U.S. Pat. No. 5,588,384, a belt-loop sewing machine has been known which is capable of sewing a multiplicity of belt loops through which a belt is allowed to pass through, onto the waist of a variety of sewed products, such as jeans and skirts. In general, the belt-loop sewing machine is provided with a belt-loop supply unit for automatically supplying the belt loop to the sewing position.
A conventional belt-loop sewing machine
1
shown in
FIG. 20
incorporates a machine body
2
and a belt-loop supply unit
3
.
The machine body
2
is a cycle machine having two needles and incorporating a needle plate
9
disposed on the upper surface of a machine bed
5
. Two parallel needles
7
disposed in the lengthwise direction of a machine arm
6
are joined to a needle bar
8
allowed to vertically be moved by a known needle-bar moving mechanism (not shown) which is operated in synchronization with rotations of an upper shaft. The machine arm
6
is provided with a known cloth retaining unit (not shown) for supporting two presser feet
10
,
10
vertically movable up and down relative to a needle plate
9
. Thus, the waist portion of trousers or the like placed to surround the machine bed
5
can be held between the each presser feed
10
,
10
and the needle plate
9
.
An operator faces a free end of the machine arm
6
of the machine body
2
when the operator performs the sewing operation. The free end is defined an operator side OS and opposite side is defined a back side BS for convenience. The belt-loop supply unit
3
is disposed in the right-side portion when it is viewed from the operator side OS of the machine body
2
. The machine body
2
and the belt-loop supply unit
3
are disposed on a sewing table (not shown).
The belt-loop supply unit
3
has a tape supply means
13
for delivering an elongated tape
12
for forming belt-loop from the back side BS to the operator side OS in the lengthwise direction of the machine body
2
. Then, the tape supply means
13
cuts the delivered tape
12
at its proximal end to have a predetermined length so as to form a belt-loop. Moreover, the belt-loop supply unit
3
has a loop supply means
20
which holds portions adjacent to the two ends of the belt-loop having the predetermined length to bend the ends of the belt-loop and moves the belt-loop to the sewing position of the machine body
2
.
The tape supply means
13
incorporates a tape delivery frame
14
on which the tape
12
delivered from a tape supply source (not shown) is placed on the upper surface thereof. A delivery roller
15
serving as a tape delivering means is disposed above the tape delivery frame
14
. The delivery roller
15
can be brought into contact with the upper surface of the tape
12
.
The delivery roller
15
is formed in a disc-like shape having an outer surface provided with a plurality of teeth
16
for delivering the tape
12
. The delivery roller
15
is rotated/stopped by a tape delivering motor (not shown). A tape cutting means
17
is disposed at a position adjacent to the leading end of the tape delivery frame
14
disposed downstream (indicated with an arrow B shown in
FIG. 20
) in a direction in which the tape
12
is delivered, the tape cutting means
17
being structure to cut the base portion of the tape
12
to form a belt-loop (not shown) having a predetermined length. The tape cutting means
17
incorporates a movable blade
17
a
which is usually disposed above the movement passage for the tape
12
and which is able to move vertically by a cutting drive means (not shown), such as a cylinder, after the tape
12
has been fed for a predetermined length. Moreover, the tape cutting means
17
incorporates a fixed blade (not shown) disposed below the movement passage for the tape
12
.
A pair of front and rear L-like shaped tape receiving members
18
are, as a tape support means, disposed to support, from lower sides, the belt-loop having the predetermined length supplied by the delivery roller
15
of the tape supply means
13
. The position supported by the tape receiving members
18
is called a belt-loop forming position P
4
. A guide rod
19
having a lower portion bent into an L-shaped is disposed between the tape receiving members
18
. The guide rod
19
aligns the side edge of the tape
12
supplied to the belt-loop forming position to a predetermined position. When the two ends of the belt-loop cut to have the predetermined length are bent by a leading end
21
a
of a bending shafts
21
to be described later, the guide rod
19
prevents deviation of the bent portions, that is, causes the bent portions to completely be superimposed.
The loop supply means
20
has right and left bending shafts
21
each having a forked leading end
21
a.
Each of the bending shafts
21
can be rotated around the axis thereof and moved in the axial direction by a fork drive means (not shown), such as an air cylinder. The leading ends
21
a
of the binding shafts
21
hold end portions of the belt-loop held by the tape receiving members
18
with the predetermined length. Then, the bending shafts
21
are rotated downwards to bend the end of the belt-loop by an angular degree of 180°. Then, the bending shafts
21
are moved forward so that the belt-loop is positioned to the sewing position. The leading ends
21
a
of the bending shafts
21
are always disposed at retracting positions apart from the belt-loop forming position P
4
to the right side when the leading ends
21
a
are viewed from a position adjacent to the operator side OS.
The tape delivery frame
14
is provided with a thickness detecting means
22
for detecting a stepped portions or the like of the tape
12
and whether or not a tape
12
has been placed on the tape delivery frame
14
.
The conventional belt-loop sewing machine
1
structured as described above causes the tape
12
to be delivered from the upper surface of the tape delivery frame
14
to the belt-loop forming position P
4
owing to the rotations of the delivery roller
15
. Then, the tape
12
is supported by the tape receiving members
18
from lower side. At this time, the thickness detecting means
22
detects the stepped portion of the tape
12
which is moving on the tape delivery frame
14
to remove the failed belt-loop, and whether or not the tape
12
exists to urge the supply of the tape
12
.
Then, the tape
12
delivered by the guide rod is moved and aligned to the standing portions of the tape receiving members
18
. Then, the bending shafts
21
are moved forward toward the belt-loop forming position so that the tape
12
is inserted into a forked portion at the leading ends
21
a
of the bending shafts
21
. Then the tape cutting means
17
cuts the proximal end of the tape
12
so that a belt-loop having the predetermined length is formed.
Then, the bending shafts
21
are rotated such that the two ends of the belt-loop are bent by an angular degree of 180°. Then, the bending shafts
21
are moved in the axial direction so as to move the belt loop from the belt-loop forming position to the sewing position on a sewed product S. Then, the presser feet
10
are moved downwards to press the sewed product S and the two end bent portions of the belt loop against the needle plate
9
. Then, the bending shafts
21
are moved rearwards so as to be removed from the belt loop. Then, the upper surfaces of the two end bent portions of the belt loop are sewed so that the belt loop is sewed onto a predetermined position of the sewed product S.
After the bending shafts
21
have been moved rearwards, the bending shafts
21
are rotated inversely to restore the initial state of the bending shafts
21
. Then, a subsequent operation similar to the foregoing operation is performed so as to form a belt loop which must be sewed next. Then, the bending shafts
21
are brought to be on s
Hirasawa Yutaka
Nii Tomio
Ono Yasushi
Juki Corporation
Morgan & Finnegan L.L.P.
Nerbun Peter
LandOfFree
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