Static molds – Providing substitution of alternatively used parts – Part having intelligence
Reexamination Certificate
1999-12-03
2002-03-12
Nguyen, Nam (Department: 1722)
Static molds
Providing substitution of alternatively used parts
Part having intelligence
C425S173000, C249S104000
Reexamination Certificate
active
06354560
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a marking device suitable for a molding tool. More particularly, the present invention relates to a marking device assembled in a molding tool, for imprinting marks on a surface of an item to be molded (hereinafter abbreviated as a molded piece) during the molding of the molded piece. The marking device mark imprints marks for use in quality control or lot control, for example, date, lot number and so on.
2. Description of the Prior Art
Conventionally, in order to perform quality control and lot control of various molded items, data regarding production date, lot number and so on are imprinted on surfaces of molded items with the date marker built in a molding tool.
The recent trend is to control daily and finely the quality guarantee of molded items. For the production control and product control of molded, it has become indispensable to inscribe the date of production on molded items with the mold date maker.
Conventional mold date markers (hereinafter abbreviated to markers) are classified into two types. In one type, a marker is buried in a countersunk hole formed in the inner surface of the mold member of a molding tool. In the other type, an ejector pin which has the surface exposed on the cavity side of a molding tool, desired marks being engraved on the surface, is used as a marker.
A conventional marker built in as one set is illustrated in FIGS.
17
(
a
) and (
b
). FIG.
17
(
a
) is a perspective view illustrating a marker, viewed from marks inscribed on one end. FIG.
17
(
b
) is a cross-sectional view partially illustrating a marker assembled in the inner surface of a molding tool.
The marker
300
, as shown in FIG.
17
(
a
), consists of inner column members
304
and an outer cylindrical member
305
for rotatably holding the inner members
304
on the same axis, with the end surfaces flushed with the end surfaces of the inner members
304
. The marker
300
, as shown in FIG.
17
(
b
), is built in the molding tool
202
by press-fitting the outer member
305
to the countersunk hole
303
being a recess formed inside the molding tool
302
communicating with the cavity
301
.
A normally figured display mark
300
, e.g. “arrow”, is engraved on the exposed end surface
304
A of the rotatable inner members
304
disposed near in the cavity
301
. Mirror-image (reversed) character marks
307
of 0 to 3, each representing the tenth digit of a date, are engraved on the exposed end surface
305
A of the outer member
305
.
In order to change the date of the marker
300
, the tip of a minus screwdriver is first inserted into the recess of the arrow mark
306
on the inner member
304
. Then, the arrow mark
306
is rotated with the screwdriver to set it to the mark
307
corresponding to a date number on the outer member
305
.
However, in the conventional marker shown in FIGS.
17
(
a
) and
17
(
b
), a countersunk hole
303
must be previously formed with high precision in the inner surface of the molding tool
302
to embed the marker
300
. It has been very difficult to machine the countersunk hole
303
with a high precision.
Moreover, in order to change of the date of the marker
300
, the molding tool
302
is disassembled from the molding machine (not shown). The date is adjusted with a special tool. Meanwhile, the positional relationship between the mark
306
, or “the tip of the arrow”, on the exposed end of the inner member
304
and the marks
307
, or “date numbers 0 to 3”, on the exposed end of the outer member
305
are checked. This setting work is very troublesome and takes much time to accomplish. Particularly, when the marker
300
is not viewed from outside the molding tool
302
because of the shape of the molded piece, the molding tool
302
needs to be assembled out of the molding machine. After the relative positional relationship between the marks
306
and
307
are adjusted, the molding tool
302
is re-assembled to the molding machine. Hence, the work involved is more complicated.
Moreover, when the mark
307
to be imprinted on a molded piece represents “day”, 32 equally-divided readings and “1”, “5”, “10”, “15”, “20” and “25” as mirror-image numbers representing “day” must be engraved on the display surface of the marker
300
. The small readings and mirror-image numbers make the positioning procedure quite difficult.
The marker of the type adopting an ejector pin is well known, as described previously. In this marker, desired marks are engraved on the end surface of the ejector pin exposed to the cavity.
However, in such a marker, the mark imprinted on a molded piece is limited to one display. Hence, every time the setting of the mark is changed, the molding tool must be reassembled by taking the ejector plate out of the molding tool and then attaching an ejector pin with a new mark. Hence, this type of marker is not suitable when marks are often changed.
Usually, the marker of that type imprints one label (display) to one molded piece. For instance, when two labels including the “month” and “day” are inscribed on a molded piece to be produced, two markers respectively corresponding to them must be installed on one molding tool. Hence, this marker requires installation spaces for the two markers.
SUMMARY OF THE INVENTION
The present invention is made to solve the above-mentioned problems.
Moreover, the objective of the invention is to provide a marking device for a molding tool that can substantially confirm marks to be imprinted on a molded piece from outside the molding tool and can easily change the setting of a mark as promptly as possible.
Moreover, the objective of the present invention is to provide a marking device that can imprint plural marks with a sole marker.
The objective of the present invention is achieved by a marking device for a molding tool, the marking device including a fixing-side blank having a cavity and forming one section of the molding tool, a core confronting the cavity and forming the other section of the molding tool, and a movable-side blank which can be relatively opened or closed with respect to the fixing-side blank, the marking device being attached on the side of the cavity or core, whereby a changeable mark is imprinted on a surface of a molded piece to be formed within a molding area between the cavity and the core, the marking device further comprising a reference sleeve fixedly attached, the reference sleeve having a reference imprint mark formed on a top reference imprint surface exposed to the molding area; and a pin member rotatably journaled within the reference sleeve and having a top imprint member and a base end actuator, the top imprint member having a top display imprint surface which is flush with the top reference imprint surface, on which data imprint marks to be pointed by the reference imprint mark are formed, the base end actuator displaying data display indicators respectively corresponding to the data imprint marks, on a protrusion protruded from the molding area outward; whereby the base actuator is selectively rotated based on each data stamp indicator of the pin member so that a data imprint mark selected by the top imprinting member is set on a reference imprint mark of the reference sleeve.
In the marking device according to the present invention, the top imprinting member and the base actuator of the pin member are respectively configured; and further comprises another connection member for mutually connecting the top imprinting member and the base end actuator portion.
In the marking device for a molding tool, by selectively rotating the base-end accumulator of the pin, a desired data imprint mark on the top imprinting member confronting the molding area can be accurately and simply set on the reference imprint mark of the reference sleeve. The pin can be easily machined and assembled.
In the marking device according to the present invention, the base end actuator is rotated to display the reference display indicator outside the molding area and to set a selected data display indicator of
Akiba Nobuo
Kawasaki Hiroaki
Maru Hiroaki
Futaba Denshi Kogyo Kabushiki Kaisha
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