Part sucking nozzle lifter

Details Part sucking nozzle lifter Part sucking nozzle lifter

2001-11-21

2004-02-10

Lillis, Eileen D. (Department: 3652)

Material or article handling

Device for emptying portable receptacle

Nongravity type

C414S737000, C294S065000

Reexamination Certificate

active

06688833

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a component suction nozzle elevating device which selectively elevates or lowers a suction nozzle for sucking and holding a component and can change a top dead center position of the nozzle when the component is mounted or the like.
BACKGROUND ART
Conventionally, various structures of such a component suction nozzle-elevating device are known. For example, as shown in
FIGS. 14
to
17
, a ball screw shaft
202
is forwardly and reversely rotated by a rotary drive of a motor
201
so that an elevating plate
203
having a nut screw-threaded to the ball screw shaft
202
is raised or lowered. Flanges
208
are supportedly brought into contact with this elevating plate
203
at which four nozzle elevating shafts
211
penetrate through respective through holes
204
. Each nozzle elevating shaft
211
has a nozzle
210
capable of sucking a component at a lower end thereof while provided with an elevation drive air cylinder
205
at an upper end thereof. Since each nozzle elevating shaft
211
is urged downward by a spring
206
in the elevation drive air cylinder
205
at all times, the flange
208
of each nozzle elevating shaft
211
is brought into contact with the elevating plate
203
. When the elevating plate
203
is raised or lowered by the rotary drive of the motor
201
, each nozzle elevating shaft
211
is guided by a guide unit
209
and raised or lowered.
FIG. 14
shows a state at the original point. When a nozzle is selected, as shown in
FIG. 15
, the elevating plate
203
is first lowered by a rotary drive of the motor
201
and the flange
208
of each nozzle elevating shaft
211
is separated from the elevating plate
203
by overcoming an urging force of the spring
206
. Then, the elevation drive air cylinder
205
of a nozzle elevating shaft
211
having one selected nozzle
210
is driven to lower the nozzle elevating shaft
211
and the flange
208
is brought into contact with the elevating plate
203
.
Subsequently, as shown in
FIG. 16
, while the elevating plate
203
is lowered by the rotary drive of the motor
201
, the elevation drive air cylinder
205
of the selected nozzle elevating shaft
211
is driven to lower the nozzle elevating shaft
211
. Then, a component is sucked by the nozzle
210
of the lowered nozzle elevating shaft
211
and mounted at a prescribed position on a board.
However, if vertical movement operation driven by the motor
201
and that of the air cylinder
205
are simultaneously started at the time of selecting one nozzle, the nozzle elevating shaft
211
does not immediately start lowering due to compressibility of air or the like even when air is supplied to the air cylinder
205
as compared with lowering operation of the elevating plate
203
by the motor
201
. Therefore, as shown in
FIG. 16
, such a cylinder drive delay may occur that the flange
208
of the nozzle elevating shaft
211
may lower later than the elevating plate
203
. Then, the flange
208
of the nozzle elevating shaft
211
catches up with the elevating plate
203
by a drive of the air cylinder
205
and brought into contact therewith. However, an impact due to this contact is transmitted to the nozzle elevating shaft
211
and a component sucked by the nozzle
210
at the lower end of the nozzle elevating shaft
211
can be displaced or dropped
Furthermore, as shown in
FIG. 17
, when all the nozzles are selected and top dead center positions of the nozzle elevating shafts
211
are adjusted by elevating all the nozzle elevating shafts
211
, all the nozzle elevating shafts
211
need to be raised via the elevating plate
203
by a motor overcoming activating forces of all the air cylinders in order to raise all the nozzle elevating shafts
211
. Therefore, the motor is overloaded.
Accordingly, an object of the present invention is to provide a component suction nozzle elevating device with which no impact is applied to a nozzle elevating shaft so that a component sucked by a nozzle is not displaced or dropped while a process time can be shortened by setting an optimal nozzle elevating stroke, by which the abovedescribed issues can be solved.
DISCLOSURE OF INVENTION
The present invention is constituted as described below to achieve the above object.
According to a first aspect of the present invention, there is provided a component suction nozzle elevating device comprising:
a plurality of nozzle elevating shafts supporting a suction nozzle for sucking and holding components at respective lower ends thereof with the nozzles normally urged upward;
a plurality of nozzle selecting actuators which are disposed corresponding to the plurality of nozzle elevating shafts and, when one suction nozzle to be lowered is selected from the plurality of nozzles, lowers a cylinder corresponding to the selected nozzle elevating shaft having the selected suction nozzle towards the nozzle elevating shaft in a range where the cylinder is not brought into contact with the selected nozzle elevating shaft;
a rotary drive device for elevation which simultaneously lowers all the nozzle selecting actuators to bring the cylinder selectively lowered by the nozzle selecting actuator into contact with the selected nozzle elevating shaft in order to lower the nozzle elevating shaft; and
a top dead center changing device which changes a position of a top dead center of each of the nozzle elevating shafts.
According to a second aspect of the present invention, there is provided a component suction nozzle elevating device according to the first aspect, further comprising an elevating member to which all the nozzle selecting actuators are fixed and which is screw-thread to a screw shaft connected to a rotating shaft of the rotary drive device for elevation and raised or lowered by forward and reverse rotation of the screw shaft, wherein the elevating member is raised or lowered by the forward- and reverse rotation of the screw shaft so that all the nozzle selecting actuators are simultaneously raised or lowered.
According to a third aspect of the present invention, there is provided a component suction nozzle elevating device according to the second aspect, wherein
the elevating member has a through hole or notch through which an upper end portion of the nozzle elevating shaft can penetrate; when one suction nozzle to be lowered is selected from the plurality of nozzles, the upper end portion of the nozzle elevating shaft is positioned in the through hole or notch in a range in which the upper end portion of the nozzle elevating shaft is not projected above the through hole or notch and a lower end of the cylinder of the nozzle selecting actuator is lowered until brought into contact with an edge of the through hole or notch; a gap is formed between the lower end of the cylinder and the upper end portion of the nozzle elevating shaft in the through hole or notch; and, when the elevating member is lowered by a rotary drive of the rotary drive device for elevation, the lower end of the cylinder and the upper end portion of the nozzle elevating shaft are brought into contact with each other so that the nozzle elevating shaft for elevating is lowered by the lower end of the cylinder.
According to a fourth aspect of the present invention, there is provided a component suction nozzle elevating device according to the second aspect, wherein a flat plate portion with which the lower end of the cylinder is brought into contact and which can be depressed is fixed to the upper end portion of the nozzle elevating shaft; when one suction nozzle to be lower is selected from the plurality of nozzles and the lower end of the cylinder is lowered, a gap is formed between the lower end of the cylinder and the flat plate portion of the upper end portion of the nozzle elevating shaft; and, when the elevating member is lowered by the rotary drive of the rotary drive device for elevation, the lower end of the cylinder and the flat plate portion of the upper end portion of the nozzle elevating shaft are brought into contact with each other and the nozzle

Affiliated with

Also associated with

Rating

Part sucking nozzle lifter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Part sucking nozzle lifter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Part sucking nozzle lifter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3330437