Embroidery machine

Details Embroidery machine Embroidery machine

2001-05-14

2004-03-02

Nerbun, Peter (Department: 3765)

Sewing

Special machines

Embroidering

C112S155000, C112S470180

Reexamination Certificate

active

06698369

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical field
The present invention relates to an embroidery machine, more particularly to X-axis and Y-axis driver units for driving an embroidery frame and interlocking units of the embroidery machine.
2. Description of the Prior Art
In general, an embroidery machine is a two-axis positioning control device in which an embroidery frame into which a raw cloth is fixed moves horizontally in X or Y direction, while a needle holder of a sewing machine moves up and down.
In such an embroidery machine, the precision in movement and constant speed of the embroidery frame is closely involved with the quality of the embroidery because an embroidery frame fixed with raw cloth is configured to embroider the cloth while moving in X and Y directions.
Accordingly, a servo motor, or an induction motor which can control speed is used as a power source for driving the needle holder of the embroidery machine up and down, a stepping motor which has an excellent positioning function and is easy to control is used as a power source for driving the embroidery machine in X and Y directions.
The prior art is described below with reference to the
FIG. 22
to FIG.
24
. First, there is provided a rectangular table
102
, an embroidery frame
104
installed above the table
102
for fixing a cloth on which various patterns are embroidered, a head
106
including a plurality of needles for embroidering the cloth and installed above the embroidery frame
104
, and a hook
108
installed below the table
102
opposite to the head
106
for feeding a lower thread.
In this case, an upper shaft
403
and a lower shaft
142
for transmitting power are coupled to the head
106
and the hook
108
respectively. The upper shaft
403
and lower shaft
142
are coupled to a main-shaft driver unit
401
which provides power to the shafts.
An X-axis driver unit
110
is provided on one end portion of the embroidery machine
104
. The X-axis driver unit
110
is described below. A connector frame A
112
is coupled with one side of the embroidery frame
104
with slippingly placed on the table
102
, and a slider
114
which is located below the table
102
and move back and forth is coupled with the lower part of the connector frame A
112
. A front face of the timing belt for transmitting power is coupled with lower end portion of the slider
114
, driver timing pulley
116
and follower timing pulley
118
are coupled with one end portion and other end portion of the timing belt respectively, and a shaft
120
for transmitting power is coupled with the driver timing pulley
116
.
An X-axis driver motor
122
for providing power is coupled with one end portion of the shaft
120
, a control unit, not shown, for transmitting commands is coupled with the X-axis driver motor
122
. In addition, a guide rail
115
which serves as a guide is coupled with a lower part of the slider
114
, and the driver timing pulley
116
and follower timing pulley
118
are installed rotatably at respective leading end portion and trailing end portion of the guide rail
115
.
At the rear part of the embroidery frame
104
there is provided a Y-axis driver unit
120
. In the Y-axis driver unit
120
, a connector frame B
126
is placed on and coupled slippingly in X direction with the table
102
, in the rear end portion of the embroidery frame
104
, and a slider
128
moving back and forth is coupled with a lower part of the connector frame B
126
.
Also, a front face of the timing belt is coupled with a lower end portion of the slider
128
, and a driver timing pulley
130
and a follower gear
132
are coupled with respective leading end portion and trailing end portion of the timing belt.
A shaft
134
is coupled with the driver timing pulley
130
, an Y-axis driver motor
136
for providing power is coupled with the shaft
134
, then a control unit for transmitting commands is coupled with Y-axis driver motor
136
.
In addition, a guide rail
138
which serves as a guide is slippingly coupled with a lower part of the slider
128
, and the driver timing pulley
130
and the follower gear
132
are installed rotatably at respective leading end portion and trailing end portion of the guide rail
138
.
In the meanwhile, a thread-cut drive unit
140
for cutting unnecessary threads from the head
106
and the hook
108
is located below the table
102
, and the structure of the thread-cut drive unit
140
is as follows.
First, in the thread-cut drive unit
140
, a driver sprocket
144
is mounted on the lower shaft
142
while winding one side of a chain
146
, and a follower sprocket
148
is coupled with a shaft B
152
installed inside a case
150
in other side of the chain
146
.
In addition, a cam
154
is coupled with the shaft B
152
, a roller
156
is coupled slidingly with the cam
154
, and a front end portion of a lever
158
is coupled with the roller
156
.
Also, a hinge shaft
160
defining an axis of rotation is coupled with the center of the lever
158
, and a solenoid, not shown, for applying force to attach the roller
156
to the cam
154
or to detach the roller
156
from the cam
154
is installed at the lower end portion of the hinge shaft
160
.
Further, a pusher
162
for transmitting the force is vertically coupled with the rear end portion of the lever
158
, a rod
164
moving back and forth is coupled with the lower end portion of the pusher
162
, in this case, the rod
164
extends outwardly through the case
150
.
A thread-cut shaft
166
rotating positive or reverse direction by the power transmitted at the time of moving back and forth is installed on the rod
164
, a cutter A
168
rotating with the shaft
166
is coupled with the upper end portion of the thread-cut shaft
166
above the hook
108
, and a cutter B
170
is located crosswise at the front end portion of the cutter A
168
. At this time, the cutter B
170
is fixed to a hook base
172
.
In addition, a front end portion of a shaft C
174
which transmits power is coupled to the hook
108
, a follower gear
176
formed with helical gear is engaged with the rear end portion of the shaft C
174
, a driver gear
178
formed with helical gear is installed at the lower shaft
142
in gear engagement with the follower gear
176
.
In the meanwhile, a color-change drive unit
180
for adjusting the head to embroider in various colors is located at one end portion of the head
106
as shown in
FIG. 25
, the color-change drive unit
180
comprises a rod
182
moving back and forth and coupled with the one end portion of the head
106
at the same time, a block
184
moving back and forth with the rod
182
is coupled with a rear end portion of the rod
182
inside a housing
186
.
Also, guide rods
188
that serve as a guide for moving back and forth are coupled slippingly with upper and lower parts of the block
184
, and front and rear end portions of the guide rod
188
are coupled with the housing
186
walls respectively.
A sensor pointer
190
configured to check the range of movement of the head
106
is installed at the front part of the block
184
, a roller
192
is rotatably coupled with the block
184
rear part.
While, the roller
192
is mounted in a threaded groove of a cam shaft
194
which transmits force for moving the block
184
back and forth, the cam shaft
194
is installed transversely inside the housing
186
, the front and rear end portions of the cam shaft
194
are coupled rotatably with walls of the housing
186
respectively, a follower gear
196
for receiving power is coupled with a rear part of the cam shaft
194
.
In addition, a driver gear
198
is coupled with a follower gear
196
in gear engagement, the driver gear
198
is coupled with a shaft
202
of a step motor
200
which provides power, and a control unit for transmitting commands is coupled with the step motor
200
. In addition, a panel which is not shown is coupled with a front face of the housing
186
, a plurality of sensors which are used to determine whether the color of a lower thread has changed or not by sen

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