Metal working – Means to assemble or disassemble – Means to assemble electrical device
Reexamination Certificate
2001-09-07
2004-05-18
Trinh, Minh (Department: 3729)
Metal working
Means to assemble or disassemble
Means to assemble electrical device
C029S740000, C029S743000, C029SDIG004, C294S002000, C294S064200
Reexamination Certificate
active
06735853
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a parts suction apparatus of a module head in a surface mount device, and more particularly, to a parts suction apparatus for suctioning surface mounting parts in a module head of a surface mount device used for mounting surface mounting parts on a printed circuit board.
2. Description of the Related Art
A surface mount device includes a X-Y gantry, a carrier, a module head and a vision system. The carrier is used for carrying the printed circuit board for mounting surface mounting electric and electronic parts (hereinafter, parts) to a working position of the surface mount device. The module head is used for picking up parts and carrying them onto the printed circuit board which is carried to the working position. The module head is mounted in the X-Y gantry and is moved to a X-Y direction to mount parts on the printed circuit board.
The parts carried and mounted onto the printed circuit board are picked up by a nozzle provided at the module head, and a position error of the parts picked up by the nozzle is sensed by the vision system. When an error occurs on the position of the parts picked up by the nozzle, the vision system rotates the nozzle finely to correct the position and then picks up the parts to mount the same on the printed circuit board. The module head picking up parts and carrying them onto the printed circuit board will now be described with reference to the accompanying drawings.
FIG. 1
is a front view of a module head of a surface mount device to which a nozzle rotating apparatus is adapted according to the conventional art. As illustrated therein, the module head
10
includes a plurality of heads
20
a
each head including a hollow shaft
11
, a rotary shaft
12
, a guide shaft
13
and a parts suctioning apparatus
20
. The hollow shaft
11
is installed inside the rotary shaft
12
, and the rotary shaft
12
is installed inside the guide shaft
13
. The hollow shaft
11
is installed to be moved in a vertical direction inside the rotary shaft
12
, and the rotary shaft
12
is installed to be rotated inside the guide shaft
13
.
One end of the rotary shaft
12
is connected with a motor
1
a
by a timing belt
1
b
so that it can be rotated finely using a rotatory force generated from the motor
1
a
. On the outer circumferential surface of the hollow shaft
11
, a guide member
11
a
is formed so that the hollow shaft
11
can be rotated when the rotary shaft
12
is rotated. The guide member
11
a
is installed inside a guide penetrating groove
12
a
of the rotary shaft
12
. The guide member
11
a
is installed in such a manner that the hollow shaft
11
can be guided to the guide penetrating groove
12
a
when moving vertically inside the rotary shaft
12
.
An air inlet
13
a
installed below the guide shaft
13
is used for introducing or running off air to the parts suction apparatus
20
. When air is sucked out through the air inlet
13
a
, the parts suction apparatus
20
sucks parts, and when air is introduced, the parts suction apparatus
20
releases the sucked parts. The construction and operation of the parts, suction apparatus
20
for sucking or removing parts will now be described with reference to the accompanying drawings.
FIG. 2
is a front view of a parts suction apparatus
29
mounted on a hollow shaft
11
shown in
FIG. 1
, and
FIG. 3
is a front sectional view of the parts suction apparatus
29
shown in FIG.
2
. As illustrated therein, the parts suction apparatus
20
mainly includes a socket
21
, a bolt
22
(refer to FIG.
3
), a hatch
23
, a holder
24
and a nozzle
25
. As illustrated in
FIG. 3
, when the bolt
22
is connected to the inside of the socket
21
, the nozzle
25
is installed inside the holder
24
and then the holder
24
is installed inside the socket
21
. Once the holder
24
is installed inside the socket
21
, the latch
23
is installed on the socket
21
so that the holder
24
is supported by the socket
21
.
To receive elastic force, a first spring
28
is installed on the outer circumferential surface of the socket
21
between the socket
21
and the latch
23
, and a second spring
29
is installed between the holder
24
and the nozzle
25
. The first and second springs
28
and
29
are used for alleviating impact when sucking parts. A first ball
26
installed below one end of the socket
21
is used for mounting or demounting the holder
24
on the socket
21
. A second ball
27
is used for minimizing friction when installing the latch
23
on the socket
21
. In order to mount and fix the nozzle
25
to the holder
24
installed on the socket
21
using the first ball
26
, a pin hole
25
a
is formed. The pin hole
25
a
is installed by fixing the nozzle
25
to the holder
24
by using a pin (not shown). Therefore, a pin (not shown) is penetrated to the pin hole
25
a
, thereby fixing the nozzle
25
to the holder
24
.
In the thusly constructed parts suction apparatus according to the conventional art, there is a problem that since the second spring is used for alleviating impact when sucking parts, the second spring installed between the holder and the nozzle is required to have a predetermined length in order to sufficiently absorb the impact caused by the suctioning of parts, and therefore the length of the nozzle becomes larger.
In addition, in the conventional parts suction apparatus, there is another problem that since a mechanism for elevating the socket to a predetermined height is needed for replacing the nozzle by changing the first ball installed on the socket from the fixed state to the free state, the construction of the parts suction apparatus is complicated and the replacing time of the nozzle is lengthened.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a parts suction apparatus of a module head in surface mount device which can reduce nozzle replacement time by simplifying the mount structure of the parts suction apparatus using the plate spring members when mounting the holder to the socket or demounting the same.
It is another object of the present invention to provide a parts suction apparatus which can simplify the structure of the nozzle and decrease the length of the nozzle by using the plate spring members in order to alleviate impact when sucking parts.
To achieve the above object, there is provided a parts suction apparatus of a module head in surface mount device comprising: a socket having a first through hole in an inner longitudinal direction and a fixing member inside the first through hole, one end of the inside of the first through hole being mounted to a hollow shaft by using the fixing member; a nozzle having a second through hole for forming an air passage when sucking parts in an inner longitudinal direction; a coupling member installed to an inside of the first through hole formed the socket and having a third through hole in an inner longitudinal direction and a plurality of plate spring members installed inside the third through hole formed on the socket for supporting the nozzle when being installed at the other end of the inside of the first through hole and for alleviating impact when the nozzle sucks parts; and a holder for fixing the nozzle so that it is not removed from the coupling member when the nozzle is installed inside the third through hole of the coupling member.
Preferably, the nozzle has a taper formed on its outer circumferential surface so that it is supported by the plate spring member installed inside the third through hole of the coupling member, threads are formed on the outer circumferential surface of the coupling member and on the inner circumferential surface of the first through hole, respectively, in order to install the coupling member to the other end of the first through hole formed to the socket and a plurality of slots are formed to the inner circumferential surface of the third through hole of the coupling member in order to install the plate spring member inside the third through h
Fleshner & Kim LLP
Mirae Corporation
Trinh Minh
LandOfFree
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