Metal working – Means to assemble or disassemble – Means to assemble electrical device
Reexamination Certificate
2001-01-18
2004-02-03
Miller, Carl S. (Department: 3729)
Metal working
Means to assemble or disassemble
Means to assemble electrical device
C029S743000
Reexamination Certificate
active
06684490
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a nozzle rotating apparatus of a module head of a surface mounting device, and more particularly to a nozzle rotating apparatus of a module head of a surface mounting device which is capable of correcting an error possibly occurring when a nozzle picks up an electronic component and places it on a printed circuit board.
2. Description of the Background Art
FIG. 1
is a plan view of a module head of a surface mounting device adopting a nozzle rotating apparatus in accordance with a conventional art, and
FIG. 2
is a side view of the module head of FIG.
1
.
Conventionally, as shown in
FIGS. 1 and 2
, a module head of a surface mounting device employing a nozzle rotating apparatus roughly includes a head
10
and a nozzle rotating apparatus
15
.
The head
10
includes a shaft
11
, a vertical movement unit
12
connected with the shaft
11
and an air opening and closing unit
13
. The nozzle rotating apparatus
15
includes a rotatable motor
1
a
and a plurality of timing belts
1
b.
A nozzle
11
a
is installed at the other side of the shaft
11
. That is, the nozzle
11
a
is assembled at the other side of the shaft
11
installed penetrating the inner side of the vertical movement unit
12
.
A guide pin
11
b
is disposed to prevent the shaft
11
from rotating rightward and leftward when the shaft
11
is moved vertically.
The shaft
11
is rotatable in a vertical direction by the vertical movement unit
12
and picks up an electronic component (not shown) when the nozzle
11
a
connected with one side of the shaft
11
is moved downwardly by the vertical movement unit
12
.
The nozzle
11
a
picks up or places the electronic component according to operation of flowing in and flowing out of air which is supplied from the air opening and closing unit
13
. When the nozzle
11
a
picks up the electronic component, it moves the electronic component to a vision unit (not shown) to thereby sense a picking position of the electronic component and discriminate whether there is an position error. In case that the nozzle
11
a
fails to pick up the electronic component accurately, the nozzle
11
a
needs to be rotated minutely and precisely.
The nozzle rotating apparatus
15
transmits the rotating force generated by the rotatable motor la to the plurality of timing belts
1
b
assembled at the rotational centering shaft
1
c
, and the timing belts
1
b
transmits the rotating force generated by the rotatable motor
1
a
to gears (not shown) combined with each engated shaft
11
. Then, as the gears installed at each shaft
11
are rotated upon receiving the rotating force through the timing belt
1
b
, the shaft
11
is rotated, and according to the rotation of the shaft
11
, the nozzle
11
a
is rotated.
However, the conventional nozzle rotating apparatus has disadvantages in that, since it employs the timing belt, when the timing belt is used for a long time, it is abraded. Abrasion of the timing belt causes an error between gears, leading to an occurrence of a backlash. Then, the position correction of the electronic component is not made accurately, and the durability of the nozzle rotating apparatus is shortened.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a nozzle rotating apparatus of a module head of a surface mounting device by which in case that a module head erroneously picks up a component, a shaft is minutely rotated to correct an error of a nozzle position, to thereby pick up the component accurately.
Another object of the present invention is to provide a nozzle rotating apparatus of a module head of a surface mounting device by which a backlash is prevented from occurring when an error of a nozzle position is corrected and a linear motor, a rack and a pinion are easily assembled.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a nozzle rotating apparatus of a module head of a surface mounting device for picking up an electronic component and placing it at a predetermined position, including: a head movable in a predetermined direction along an upper portion of a substrate and having at least one shaft; a driving means for driving the head; a nozzle mounted at a lower predetermined portion of the head to pick up and place the electronic component; pinions installed at the outer periphery of the shaft installed at a predetermined portion of the head; a rack engaged with the pinions; and a driving force transmitting means for moving the rack to a predetermined direction.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4322838 (1982-03-01), Neumann
patent: 4480780 (1984-11-01), Claeskens et al.
patent: 4644642 (1987-02-01), Wardenaar et al.
patent: 4860438 (1989-08-01), Chen
patent: 4937510 (1990-06-01), Konno et al.
patent: 5160181 (1992-11-01), Lykam et al.
patent: 5377405 (1995-01-01), Sakurai et al.
patent: 5579572 (1996-12-01), Kashiwagi et al.
patent: 5768765 (1998-06-01), Fujioka et al.
patent: 5850683 (1998-12-01), Okazaki et al.
patent: 6070318 (2000-06-01), Baker et al.
patent: 6446331 (2002-09-01), Horigome
Chun Jang Sung
Hwang Ji Hyun
Kim Do Hyun
Birch & Stewart Kolasch & Birch, LLP
Miller Carl S.
Mirae Corporation
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