Oblique thread-guiding link of a sewing machine

Details Oblique thread-guiding link of a sewing machine Oblique thread-guiding link of a sewing machine

2003-04-29

2004-03-30

Izaguirre, Ismael (Department: 3765)

Sewing

Elements

Thread guiding or handling

C112S284000, C112S220000

Reexamination Certificate

active

06712015

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to an oblique thread-guiding link of a sewing machine, in which the swing arm is obliquely mounted in the sewing machine.
2. Description of the Prior Art
FIGS. 1 and 2
show a conventional sewing machine. A swing arm
91
is pivotally mounted in the sewing machine. The center of the swing arm
91
has a sleeve
911
having a shaft hole
912
. A pivot shaft
92
is axially fitted through the shaft hole
912
. Two ends of the pivot shaft
92
are perpendicularly pivotally mounted between two sidewalls
93
a
,
93
b
of the sewing machine. A front swing arm
91
a
forward radially projects from a first side of the sleeve
911
. A rear swing arm
91
b
rearward radially projects from a second side of the sleeve
911
. The front swing arm
91
a
is positioned above a needle holder mechanism
94
and aligned and coupled therewith. The rear end of the rear swing arm
91
b
is positioned above a driving mechanism
95
and coupled therewith. When the driving mechanism
95
up and down drives the rear swing arm
91
b
, the front swing arm
91
a
is swung along with the rear swing arm
91
b
to drive the needle holder mechanism
94
to move up and down. At the same time, a thread guiding rod
96
mounted on outer side of the pivot shaft
92
is driven and swung to guide the stitch thread into the needle holder mechanism
94
.
Referring to
FIGS. 1 and 2
, the front and rear swing arms
91
a
,
91
b
of the swing arm
91
are respectively positioned on left and right sides of the sleeve
911
. Therefore, the central axis
9
a
of the front swing arm
91
a
does not coincide with the central axis
9
b
of the rear swing arm
91
b
. Instead, the axis
9
a
is spaced from the axis
91
b
by a distance D. Therefore, when the driving mechanism
95
drives the swing arm
91
to swing up and down about the pivot shaft
92
, the action force F will create a bending moment M onto the swing arm
91
. As a result, when the swing arm
91
quickly up and down swing, the swing arm
91
is vibrated to emit a noise. This tends to speed the wearing the pivot shaft.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an oblique thread-guiding link of a sewing machine, including a swing arm having a front section defined as a front swing arm and a rear section defined as a rear swing arm. The center of the swing arm is formed with a shaft hole in which a pivot shaft is tightly fitted. Two ends of the pivot shaft are obliquely pivotally mounted in two opposite sidewalls of the housing of the sewing machine. One end of the pivot shaft protrudes from the housing of the sewing machine. The front end of the front swing arm is positioned above a needle holder mechanism and aligned and coupled therewith. The rear end of the rear swing arm is positioned above a driving mechanism and aligned and coupled therewith. One end of a thread-guiding fixing seat is fixedly connected with the protruding end of the pivot shaft and is driven by the swing arm to swing. A thread-guiding bar is fixed at the second end of the thread-guiding fixing seat and formed with multiple thread-guiding eyelets.
It is a further object of the present invention to provide the above oblique thread-guiding link of the sewing machine, in which the front and rear ends of the swing arm are straightly projectively positioned above the needle holder mechanism and the driving mechanism to correspondingly couple therewith. The application force point and the resistance force point are positioned on the same straight line so as to eliminate the vibration and noise produced when the swing arm swings.
It is still a further object of the present invention to provide the above oblique thread-guiding link of the sewing machine, in which two collars are respectively fitted on two ends of the pivot shaft. The bodies of the collars are inlaid in the sidewalls of the sewing machine. One end of the body of each collar is formed with a flange for abutting against inner side of the sidewall of the sewing machine. Accordingly, the pivot shaft can stably swing in a predetermined position without axially sliding.
The present invention can be best understood through the following description and accompanying drawings wherein:


REFERENCES:
patent: 1999893 (1935-04-01), Christensen
patent: 2048555 (1936-07-01), Lindstom
patent: 2905120 (1959-09-01), Hacklander
patent: 4875422 (1989-10-01), Ishikawa
patent: 5899156 (1999-05-01), Schopf et al.

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