Winding – tensioning – or guiding – Helical or random winding of material – Including positioning of material outer end on wound package
Reexamination Certificate
1999-01-28
2001-02-06
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Helical or random winding of material
Including positioning of material outer end on wound package
C242S474200, C112S180000, C112S279000
Reexamination Certificate
active
06182918
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lower thread winding device which is used to wind a lower thread around a bobbin disposed within a bobbin case and, after then, deal with the lower thread extended from the bobbin case and guide it from an opening formed in the bobbin case to a slit formed in the bobbin case.
2. Description of the Related Art
Recently, for example, in Japanese Patent Publication No. 9-75570 of Heisei, there is proposed a lower thread winding device which is capable of executing an automatic winding operation to wind a lower thread around a bobbin.
The lower thread winding device of this type, for example, as shown in
FIG. 2
, comprises lower thread supply means
30
which is used to supply a lower thread L to a bobbin
15
disposed within a bobbin case
10
, bobbin rotate means
20
which rotates the bobbin
15
in order to wind the lower thread L around the bobbin
15
, and a thread handling member
40
which, in order to set one end side of the lower thread L under a lower thread tension adjust spring
11
disposed within the bobbin case
10
after the lower thread L is supplied to the bobbin
15
, handles one end side of the lower thread L and guides it from an opening
10
a
to a slit
10
b
respectively formed in the bobbin case
10
.
The lower thread supply means
30
comprises a thread supply nozzle
36
for guiding the lower thread from the leading end portion of the lower thread supply means
30
, and a motor which is used to rotate the thread supply nozzle
36
in such a manner that the leading end portion of the thread supply nozzle
36
can be moved to an initial operation position N
1
facing the opening
10
a
of the bobbin case
10
, a lower thread winding position N
2
spaced apart from the bobbin case
10
, and a thread cutting position N
5
.
The bobbin rotate means
20
comprises a rotary body
25
disposed in such a manner that the bobbin
15
within the bobbin case
10
can be contacted with and removed from the rotary body
25
, and buffer means
24
which is used to energize the rotary body
25
with a buffer force in a direction where the rotary body
25
is pressed against the bobbin
15
; and, the bobbin rotate means
20
is structured such that it contacts and presses the bobbin
15
stored in the bobbin case
10
against the rotary body
25
to thereby rotate the bobbin
15
.
The thread handling member
40
is formed in a shape which corresponds to the peripheral side surface of the bobbin case
10
and is structured such that it can be rotated around the bobbin case
10
along the bobbin case
10
peripheral side surface through a given course to handle the lower thread L extended to the opening
10
a
of the bobbin case
10
, thereby moving the lower thread L from the opening
10
a
of the bobbin case
10
to the slit
10
b
thereof (see FIG.
5
).
Referring here to the thread handling operation of related art to be executed by the thread handling member
40
, as shown in
FIG. 5
, because it is necessary to pass the lower thread L between the edge portion
10
g
of the bobbin case
10
on the open surface
10
f
side thereof and the flange
15
A of the bobbin
15
, the thread handling operation is executed in such a state that the bobbin
15
stored within the bobbin case
10
is separated from the rotary body
25
of the bobbin rotate means
20
and the bobbin
15
is thereby free from the rotary body
25
However, in the above-mentioned conventional lower thread winding device, if the lower thread is wound around the bobbin nearly 100%, then the lower thread does not reach the slit of the bobbin case when carrying out the thread handling operation but stops halfway. As a result, in a thread guiding operation in which the lower thread is guided below the lower thread tension adjust spring of the bobbin case, because the lower thread has not arrived at the slit, the lower thread is guided in a poor manner.
Referring to the reason why the lower thread cannot reach the slit, if the lower thread is wound around the bobbin nearly 100%, then the portion of the lower thread that is extended out from the bobbin case lies down (that is, the guide portion of the lower thread extended externally of the bobbin lies on the bobbin peripheral edge side that is distant from the bobbin center portion, so that the guide angle of the lower thread extended externally of the bobbin becomes small) and, therefore, when the thread handling member moves on the edge portion of the bobbin case on the open surface side thereof to thereby guide the lower thread into between the present edge portion and the flange of the bobbin, the lower thread is unable to get into between them.
Also, in the above-mentioned lower thread winding device, in the thread handling operation, the bobbin is separated from the rotary body of the bobbin rotate means and is thus free. As a result, for example, when a firm thread is wound around the bobbin, there is a possibility that the flange of the bobbin can stick out from the bobbin case to thereby cause the lower thread to fly externally of the bobbin.
In order to prevent such fly-out of the lower thread, when a span thread or a cotton thread is used, the winding amount of the lower thread around the bobbin must be set less than or equal to 70-80% and, when a Tetoron thread is used, the winding amount of the lower thread around the bobbin must be set less than or equal to 50%.
SUMMARY OF THE INVENTION
The present invention aims at eliminating the drawbacks found in the above-mentioned conventional lower thread winding device. Accordingly, it is an object of the invention to provide a lower thread winding device including a thread handling member which, after a lower thread is supplied, is used to handle the lower thread to move it from an opening to a slit respectively formed in a bobbin case, characterized in that, even when the lower thread is wound around a bobbin nearly 100%, the present thread handling member is able to move the lower thread to the slit of the bobbin smoothly in its thread handling operation and, further, in the thread handling operation, the lower thread is prevented from flying externally of the bobbin.
In attaining the above object, this invention provides a lower thread winding device, comprising: lower thread supply means for guiding a lower thread out from a lower thread supply source and also for supplying the lower thread to a bobbin through an opening formed in a bobbin case; bobbin rotate means including a rotary body disposed on a bobbin within the bobbin case in such a manner as to be contactable with and separatable from the bobbin, the bobbin rotate means being capable of rotating the bobbin due to mutual contact between the rotary body and bobbin to thereby wind the lower thread around the bobbin; and, a thread handling member, after completion of winding of the lower thread around the bobbin, for handling a lower thread extended from the bobbin case to the lower thread supply source to thereby guide the lower thread from the opening of the bobbin case up to a slit formed in the peripheral side surface of the bobbin case, wherein, when the thread handling member guides the lower thread, the pressing forces of the rotary member and bobbin against each other is weakened to thereby set them in a half-clutch state.
According to the invention, when the thread handling member guides the lower thread from the opening of the bobbin case to the slit thereof, the mutual contact between the bobbin stored within the bobbin case and the rotary body of the bobbin rotate means is not removed but is maintained, which can solve the conventional problem that the flange of the bobbin can stick out from the bobbin case and thus the lower thread wound around the bobbin can fly out from the bobbin.
Also, during the lower thread guide by the thread handling member, the rotary body is not set in a full pressing state in which it is fully pressed against the bobbin toward the bobbin case, but is set in a half-clutch state; that is, the bobbin is allowed to floa
Juki Corporation
Morgan & Finnegan L.L.P.
Walsh Donald P.
Webb Collin A.
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