Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under...
Patent
1996-10-17
1998-10-06
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
249 53R, 249103, 249104, B29C 3300
Patent
active
058173498
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a marker device insertable in plastic injection molds, of the type which are comprised by a hollow body, which can be embedded in the mold in such a manner that its external surface is flush with the internal wall of the mold, the said hollow body being provided with a cylindrical, central orifice within whose interior a cylindrical head is tightly placed that extends towards the interior of the mold via an internal coaxial rod that pierces the hollow body and that on its outer end also presents an external surface flush with the internal wall of the mold, the said head being able to turn on its own axis with the aim of varying its angular position with respect to the hollow body.
STATE OF THE ART
Marker devices which can be inserted in plastic injection molds are well-known, principally useful to record date of manufacture and other similar details in pieces of injected plastic.
The date-markers for molds of thermoplastic material are basically composed of a hollow, cylindrical body, where the numbers of the months, weeks etc. are recorded, and of a central, cylindrical head in which is recorded the present year and an arrow whose point indicates the month, week, etc. in which the product was manufactured. In this manner, the date of manufacture of the product can always be known with exactitude.
The date-marker bodies of this type are embedded in the wall of the mold and their numbers are normally recorded in bas-relief, by which means they are reproduced in the injected piece in high-relief. The arrow always has a depth of impression greater than that of the numbers, which is necessary to allow the turning of the central head until the arrow indicates in each case the information which it is necessary to reproduce in the piece of plastic. Such a turn of the central head is realised by way of a conventional screwdriver or, in some cases, an Allen key.
The high-relief of the numbers in the plastic, principally that of the arrow, in many cases makes the flat placement of the piece of molded plastic difficult. At the same time, pieces of plastic for medical, pharmaceutical or alimentary use, and even those related with electronic instruments, introduce in the high-relief, recorded numbers, areas where grime is easily collected, which in many cases is not acceptable for the end use of the product.
Another problem stemming from conventional date-markers, consists in that in being placed in the cavity of the mold, their manipulation and positioning is, in many cases made difficult by the mold being in the injection machine and having difficult access, needing annoying manoeuvres to change the date and it sometimes being unavoidable to inject several pieces until the exact position of the arrow is found.
DESCRIPTION OF THE INVENTION
The marker device insertable in plastic injection molds which is the object of the present invention, eliminates all the said drawbacks and moreover provides multiple advantages that will be clear from the description of the invention.
In its essence the described device is characterised in that it is provided with actuator means embedded in the wall of the mold, connected to the internal rod of the head and susceptible of being commanded from the outside of the mold by way of external control means, said actuator means being adapted to make the head turn on its axis, in short turns of pre-determined angular values.
According to another feature of the invention, the actuator means is constituted by an electromotor, provided with a speed-reducer, and a position detector.
According to another feature of the invention, the actuator means comprises an electromotor of the "step-by-step" type.
According to another feature of the invention, the external control means is removably connected to the electromotor circuit of the actuator means, comprises a source of electric energy, is adapted to provide the electrical current for the running of the electromotor, and is provided with means for the programming of the start and stop of the e
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patent: 4708314 (1987-11-01), Kuhling
patent: 5057000 (1991-10-01), Mangone, Jr.
patent: 5494431 (1996-02-01), Tefler
patent: 5620716 (1997-04-01), Opitz
Heitbrink Tim
Striker Michael J.
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