Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1992-08-10
1994-06-07
Nguyen, Khanh
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
249103, 425169, 425183, 425185, 425190, 425588, B29C 4537
Patent
active
053184181
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to the injection molding of plastic articles, such as security seals, which are automatically numbered in a multi-cavity mold.
BACKGROUND OF THE INVENTION
Various types of injection molds capable of numbering products being molded in high relief are known, one example being disclosed in GB-A-2 066 137 which relates to a mold for injection molding a plurality of plastic articles simultaneously with the articles being automatically numbered without repeating the combinations of algorithms, but without taking into consideration sequential numbering. The mold comprises two circular mold halves defining therebetween ten radially arranged cavities for producing the numbering, the individual numbers being embossed on a series of radially adjacent split rings of increasing diameter that are rotatable with respect to each other so that different combinations of numbers are produced along ten radii corresponding to the cavities. A frustoconical hub inside the innermost ring is forced outwardly of the respective mold half between injection cycles so as to loosen the split rings and thus allow relative rotation thereof by means of a counter mechanism. On closure of the mold halves, the frustoconical hub is forced into the plane of the respective mold half, this expanding the split rings to squeeze them against each other and thus avoid any gaps that would give rise to undesirable injection trimmings between the algorithms of the injection molded numbers.
As mentioned, the mold of GB-A-2 066 137 is designed to mold groups of ten numbers in each injection, counter mechanism being such as to ensure that sequential bering is avoided without any repetition of numbering being produced before all available number combinations have been used.
The prior art does not, however, include any numbering injection mold that is capable of injecting lots of twenty (rather than ten) products with serial numbering, the alteration of the numbering between each lot being automatic. The object of the present invention is therefore to provide an injection mold having such characteristics.
SUMMARY OF THE INVENTION
According to the present invention, a plastic injection mold with serial numbering of the objects being molded comprises:
a) a first plate having two substantially parallel series of ten cavities;
b) a second plate adapted to be brought against the first plate to close said cavities, the second plate being provided with two series of ten fixed algorithms in positions corresponding to the last algorisms of the numbers to be molded in the respective cavities of the first plate, the fixed algorithms of the first series being respectively the even numbers 0, 2, 4, 6, 8, 0, 2, 4, 6 and 8 and the fixed algorithms of the second series being respectively the odd numbers 1, 3, 5, 7, 9, 1, 3, 5, 7 and 9;
c) two pluralities of endless molding tapes, a first tape of each plurality having spaced therealong an even number of series of ten groups of five identical algorithms 0, 0, 0, 0, 0; 1, 1, 1, 1, 1; . . . 9, 9, 9, 9, 9, and each of the other tapes having spaced therealong at least one series of ten groups of ten identical algorithms 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 1, 1, 1, 1, 1, 1, 1, 1, 1, 1; . . . 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, each algorithm of each of the tapes being spaced from the next and from the previous algorithms by a distance equal to the distance between said fixed algorithms, and the number of series of groups of algorithms on said other tapes being half the even number of series on said first tapes;
d) two parallel recessed passages in the face of the second plate for the passage of the respective pluralities of tapes so that twenty numbers in series may be composed together with the twenty fixed numbers;
e) means for individually advancing said tapes along said passages by increments corresponding to ten times or a multiple of ten times the said distance between the fixed numbers; and
f) command means for activating the advancing means in accordance with a predetermined programme.
Preferably, th
REFERENCES:
patent: 4106801 (1978-08-01), De Lima Castro Netto
patent: 4254933 (1981-03-01), Netto
patent: 4379687 (1983-04-01), Wilson et al.
patent: 5057000 (1991-10-01), Mangone, Jr.
LandOfFree
Plastic injection mold with serial numbering does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plastic injection mold with serial numbering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plastic injection mold with serial numbering will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-788995