Sewing – Special machines – Pattern controlled or programmed
Reexamination Certificate
2003-03-21
2004-06-01
Nerbun, Peter (Department: 3765)
Sewing
Special machines
Pattern controlled or programmed
C112S316000, C112S475190
Reexamination Certificate
active
06742467
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to an apparatus and method for controlling feed quantity and direction in a sewing machine, and more particularly to an apparatus and method for controlling feed quantity and direction of a workpiece using a motor, thereby not only allowing various patterns to be produced by stitches made up of an upper thread and a lower thread, but also allowing for a speedy sewing operation.
2. Description of the Prior Art
FIG. 1
is an exploded perspective view showing an apparatus for controlling feed quantity and direction in accordance with the prior art.
As shown in
FIG. 1
, conventionally, a change in the feed quantity caused by a feed dog
10
is controlled by changing a mechanical construction in such a manner that a feed regulating dial
12
is turned in a clockwise or counterclockwise direction. Further, a change in the feed direction is controlled by rotating a reverse regulating lever shaft
32
by a given angle in such a manner that either a reverse lever
13
or a reverse operation lever
50
(see
FIG. 2
) is pushed to drive a reverse solenoid
54
(see FIG.
2
).
When the feed regulating dial
12
is turned in a clockwise or counterclockwise direction, a feed regulating dial shaft
14
, which is engaged to the feed regulating dial
12
, is rotated to move in a forward or backward direction. There is a threaded groove formed around the feed regulating dial shaft
14
. The feed regulating dial shaft
14
is rotatably supported to an arm, which is not shown, and comes into contact with a feed regulating cam
16
. Therefore, as the feed regulating dial
12
rotates, the feed regulating dial shaft
14
moves in a forward or backward direction and at the same time the feed regulating cam
16
rotates, so that a feed regulating cam connecting rod
18
, which is pivotably connected to one end of the feed regulating cam
16
, moves in an upward and downward direction.
When the feed regulating cam connecting rod
18
moves in an upward and downward direction, a feed regulating lever
20
, which is connected to the other end of the feed regulating cam connecting rod
18
and is fixedly coupled around a reverse regulating lever shaft
32
, rotates about the reverse regulating lever shaft
32
. As a result, a condense regulator
24
, which is fixedly coupled to the reverse regulating lever shaft
32
together with the feed regulating lever
20
, also rotates In the same direction as the feed regulating lever
20
.
When the condense regulator
24
rotates, a condense regulating rod
26
, which is connected to the condense regulator
24
, moves in a direction opposite to the feed regulating cam connecting rod
18
. For instance, when the condense regulator
24
rotates in a clockwise direction, the condense regulating rod
26
moves in an upward direction, while the feed regulating cam connecting rod
18
moves in a downward direction. When an upward movement force of the condense regulating rod
26
is transmitted to a feed regulator shaft
28
, the feed regulator shaft
28
is subjected to a change in a stationary angle. With the change in the stationary angle of the feed regulator shaft
28
, the feed dog
10
is subjected to a change in feed quantity.
A description will be made below regarding a mechanism in which the feed dog
10
is fed according to controlled feed quantity.
As shown in
FIG. 1
, a feed regulator shaft
28
is connected to a feed regulator shaft connecting rod
30
. The feed regulator shaft connecting rod
30
is connected to a feed cam connecting rod
36
and a feed rocker crank
33
. Here, power, which is transmitted from a feed cam connecting rod
36
through the feed regulator shaft connecting rod
30
to the feed rocker crank
33
, functions as a driving force allowing for movement of the feed dog
10
in a forward or backward direction. An eccentric part
44
functions as a driving source, which is formed on one end of a lower driving shaft
42
and causes a feed dog base connecting rod
46
to move in an upward and downward direction while the lower driving shaft
42
rotates. At the same time, a feed dog base
48
, which is pivotably connected with the feed dog base connecting rod
46
, moves in an upward and downward direction, and thereby the feed dog
10
, which is attached on the upper surface of the feed dog base
48
, moves in an upward and downward direction.
Subsequently, a detailed description will be made regarding a forward/backward movement transmission and an upward/downward movement transmission of the feed dog
10
. The feed regulator shaft connecting rod
30
comprises a first section which is connected to the feed regulator shaft
28
and carries out a sliding motion depending on the stationary angle of the feed regulator shaft
28
, a second section which is fixed to the feed cam connecting rod
36
cooperating with the feed cam
34
with the lower driving shaft
42
and carries out a fluctuating motion, and a third section which is connected to the feed rocker crank
33
fixed to a horizontal rolling pin
38
and functions as a driving source of a feed bracket
40
fixed to a horizontal rolling pin
38
.
When the feed regulator shaft
28
has a constant angle, the lower driving shaft
42
receiving a rotating force from an upper driving shaft rotates. At this time, the feed cam connecting rod
36
, which is connected to the feed cam
34
connected to the lower driving shaft
42
and performs an eccentric motion, moves in an upward and downward direction. The first section of the feed regulator connecting rod
30
connected to the feed regulator shaft
28
moves uniformly in an upward/downward direction and at the same time in an forward/backward direction, as shown in
FIGS. 3A and 3B
. Here, when the feed regulator shaft
28
is vertically fixed, the feed regulator shaft connecting rod
30
may not move in the forward/backward direction.
Therefore, the feed regulator shaft connecting rod
30
connected to the feed rocker crank
33
fluctuates in a forward/backward direction, so that the feed bracket
40
also fluctuates in a forward/backward direction. Further, the feed dog
10
moves an elliptical motion owing to an upward/downward movement transmitted from the feed cam
34
and an forward/backward movement transmitted from the feed bracket
40
, as shown in
FIGS. 4A
to
4
D. As a result, the workpiece is fed across the feed dog.
To be more specific, when an operator rotates the feed regulating dial
12
in a direction from “2.5” to “0”, a rotating force is transmitted, through the movement transmission mechanism, such as the feed regulating cam
16
, feed regulator connecting rod
18
, feed regulating lever
20
, condense regulator
24
and condense regulating rod
26
, to the feed regulator shaft
28
. As a result, the stationary angle of the feed regulator shaft
28
is changed. When the feed regulating dial
12
is set to “0”, the rotating force, which is transmitted through the movement transmission mechanism to the feed regulator shaft
28
, causes the stationary angle of the feed regulator shaft
28
to be stopped at an angle of zero degrees. Further, the feed dog
10
reciprocates in an upward/downward direction without fluctuating in a forward/backward direction.
Subsequently, an apparatus for controlling feed direction will be described. The apparatus for controlling feed direction comprises the same mechanism as the apparatus for controlling feed quantity. In other words, the apparatus for controlling feed direction has a construction which is very similar to that of the apparatus for controlling feed quantity shown in
FIG. 1
as mentioned above. In particular, both apparatuses have completely the same power transmission mechanism next to the feed regulator shaft
28
. Therefore, the following description regarding an operation of the apparatus for controlling a feed direction will be made only on the basis of differences from the apparatus for controlling feed quantity. When an operator presses down the reverse lever
13
, the reverse regu
Nerbun Peter
Staas & Halsey , LLP
Sunstar Machinery Co., Ltd.
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