Patent Application
20080260890
There is a need to perform various operations on the molded articles while these molded articles are still located (or at least partially located) in their respective mold cavities or cores. When the molded part has a base portion and a projecting member, it can be desirable to fold the projecting member against the base portion for further processing. The reasons for folding a projecting member against a base portion immediately can include protecting the integrity of the base portion and projecting member so that the projecting member is not detached or damaged. Other reasons can include maintaining sterility of the base portion and projecting member, or folding the projecting member while it is warm so it will be unstressed in a closed position. This is in addition to the significant advantage of eliminating the need for a separate processing step at later point in time with additional cost and expense.
There are a number of types of devices utilized in the past to remove molded articles from an injection molding machine. For example, although suction cups have been used in the past, such as disclosed in U.S. Pat. No. 5,518,387, the main drawback with this disclosed technology is that the entire molded part needed to be removed. If there was a lid, this lid had to be closed in a separate manufacturing step with additional cost and expense. U.S. Pat. No. 4,589,840 discloses the use of vacuum to sequentially remove molded articles from an injection molding machine. U.S. Pat. No. 4,976,603 is an example of utilizing a suction cup to grasp and rotate a molded plastic article in a ninety degree arc by a cam-operated linkage assembly.
There are a number of references that close a projecting member, e.g., lid, against a base portion for a molded part. This includes U.S. Pat. No. 4,340,352 and U.S. Pat. No. 4,351,630, which both disclose a device for the in-mold closing of a lid of a cap. The device includes a finger mounted inboard of the mold which slides between the mold sections in an open position, and in the process, engages a portion of the article or the lid, rotates the portion or lid about the hinge, and then a slide moves on top of the lid to snap it shut. This requires two separate mechanical devices to close the lid. Such a dual mechanism is relatively complex and expensive and can add to the cycle time since this dual mechanism must move in, close the lid and move out of the way before the part is ejected and another molding cycle performed.
Commonly assigned U.S. Pat. No. 7,168,149 discloses a part removal apparatus that has a portion that, in use, grips one of the base portion of the molded part and moves the part out of the mold when the mold is open. There is a need for a separate deflector mechanism that engages the base portion of the molded part as the molded part is moved to initiate folding of the lid portion to the base portion at a hinge. Also, commonly assigned U.S. Patent Publication No. 2005/0271765 filed May 19, 2005, discloses a side shuttle apparatus whereby closing a cap of a molded container can be carried out by moving the side shuttle across the face of the mold followed by the parts being removed with a suction cup from the injection molding system.
Alternatively, robots are used to capture molded parts and move them out of the molding area where they are closed by a separate apparatus. There is minimal impact on improving cycle time with significant additional complexity and expense.
The present invention is directed to overcoming one or more of the problems set forth above.
In an aspect of this invention, an apparatus for folding at least one hinged molded part each having a base portion and a projecting member is disclosed. This includes at least one mold station, wherein each mold station includes at least two movable plates supporting cooperating mold halves, the mold halves being able to move between an open and a closed position, wherein the closed position being operable to mold an article, a drive mechanism operatively connected to the at least two movable plates to move the at least two movable plates between an open position and a closed position, and at least one part removal mechanism that is located within the at least one mold station, wherein the at least one part removal mechanism each further includes a pivotally attached arm, and the at least one part removal mechanism grips both the base portion and the projecting member of the at least one hinged molded part and removes the at least one hinged molded part from a mold half of the cooperating mold halves, and then the pivotally attached arm folds the projecting member towards the base portion of the at least one hinged molded part.
In another aspect of the invention, an apparatus for folding at least one hinged molded part each having a base portion and a projecting member is disclosed. This includes at least one part removal mechanism that is located within the at least one mold station, wherein the at least one part removal mechanism each further includes a pivotally attached arm, and the at least one part removal mechanism grips both the base portion and the projecting member of the at least one hinged molded part and removes the at least one hinged molded part from a mold half in the at least one mold station, and then the pivotally attached arm folds the projecting member towards the base portion of the at least one hinged molded part.
In yet another aspect of the invention, a method for folding at least one hinged molded part each having a base portion and a projecting member is disclosed. This method includes utilizing at least one part removal mechanism, each having a pivotally attached arm, for gripping both the base portion and the projecting member of the at least one hinged molded part, removing the at least one hinged molded part from a mold half in at least one mold station, and folding the projecting member towards the base portion of the at least one hinged molded part with the pivotally attached arm.
These are merely some of the innumerable aspects of the present invention and should not be deemed an all-inclusive listing of the innumerable aspects associated with the present invention. These and other aspects will become apparent to those skilled in the art in light of the following disclosure and accompanying drawings.
For a better understanding of the present invention, reference may be made to the accompanying drawings in which:
This invention is directed to an injection molding apparatus that is capable of folding a hinged, molded part having a base portion with a projecting member. Referring initially to
Referring now to
The plurality of first mold cores 120 and the plurality of second mold cores 118 are preferably formed in a one or two dimensional array. There is a first side support member 103 and a second side support member 116 attached to the first outer support plate 102.
There is a second outer support plate 146 that supports a first mold cavity plate 142 and a third outer support plate 148 that supports a second mold cavity plate 140. There are a plurality of first mold cavities 138 mounted on the first mold cavity plate 142 and a plurality of second mold cavities 136 mounted on a second mold cavity plate 140. The actual mold cavities forming the plurality of first mold cavities 138 and the plurality of second mold cavities 136 are best illustrated by numerals 354 and 386 in
Referring now to
There is preferably a plurality of first part removal mechanisms that are generally indicated by numeral 130. An illustrative, but nonlimiting, example of a part removal mechanism is a swing arm. Each swing arm is preferably connected to a first motorized mechanism that is generally indicated by numeral 114. A wide variety of motorized mechanisms will suffice with the preferred illustrative embodiment being a servo motor. The first motorized mechanism 114 is connected to a first shaft 128 that provides pivoting for the plurality of first part removal mechanisms 130 and is supported by a first hinge frame 150. The plurality of first part removal mechanisms 130 is aligned directly over the plurality of second mold cores 118 and include a first plurality of gripping mechanisms 133, e.g., suction cups that optimally, but not necessarily, utilize applied vacuum, for grabbing and removing the hinged, molded parts 10 from the plurality of second mold cores 118, which are specifically shown in
Referring again to
Also, there is preferably a first plurality of pivotally attached arms 132 connected to the plurality of first part removal mechanisms 130. The first plurality of pivotally attached arms 132 can each include a solid member with a single hinge or preferably a first portion attached via a hinge to a first part removal mechanism 130 and a second portion attached via a hinge to the same first part removal mechanism 130. Mounted to the first plurality of pivotally attached arms 132 is a second plurality of gripping mechanisms 131, e.g., suction cups optimally with applied vacuum, for removing the hinged, molded part 10 from the first part removal mechanism 130 and by rotating the moving pivotally attached arms 132. The angle of rotation can be from about ninety degrees to about one hundred and eighty degrees with the optimal value being one hundred and eighty degrees.
Referring to
In a corresponding manner, there is preferably a plurality of second part removal mechanisms that are generally indicated by numeral 166 as shown in
When the plurality of second part removal mechanisms 166 are positioned over a hinged, molded part 10, the second plurality of gripping mechanism 173, e.g., suction cups that optimally, but not necessarily, utilize applied vacuum, can attach to the hinged, molded part 10. The second motorized mechanism 112 can then rotate by moving the hinged, molded parts 10 away from the plurality of first mold cores 120. This angle of rotation can vary, and it is optimally around ninety degrees away from the surface of the plurality of first mold cores 120. Optimally, the plurality of second part removal mechanisms 166 start to swing inward toward hinged, molded parts 10 prior to ejection by the plurality of second stripper plates 127. Preferably, but not necessarily, each of the plurality of first part removal mechanisms 166 includes a plate with at least one opening.
The plurality of first stripper plates 126 and second stripper plates 127 are actuated by an internal actuation mechanism located within the injection molding system 100. This stripper actuation mechanism is best illustrated by a internal actuation plate 365 that is moved by a plurality of rods 363, e.g., three rods, in
Also, there is preferably a second plurality of pivotally attached arms 172 connected to the plurality of second part removal mechanisms 166. The second plurality of pivotally attached arms 172 can each include a solid member with a single hinge or preferably a first portion attached via a hinge to a second part removal mechanism 166 and a second portion attached via a hinge to the same second part removal mechanism 166. Mounted to the second plurality of pivotally attached arms 172 is a second plurality of gripping mechanisms 174, e.g., suction cups optimally with applied vacuum, for removing the hinged, molded part 10 from the second part removal mechanism 166 and by rotating the moving the second plurality of pivotally attached arms 172, as shown in
Referring again to
As shown in
Referring now to
Referring now to
There is a first shaft 228 for rotating the first plurality of pivotally attached arms 132 of the plurality of first part removal mechanisms 130 and a second shaft 229 for rotating the second plurality of pivotally attached arms 172 of the plurality of second part removal mechanisms 166. The first plurality of pivotally attached arms 132 is operatively rotated via a first plurality of crank members 159 and a second plurality of pivotally attached arms 172 is operatively rotated via a second plurality of crank members 175. The first shaft 228 includes a first plurality of pulleys 163 attached thereto and the first plurality of crank members 159 are attached to a second plurality of pulleys 161. The second shaft 229 includes a third plurality of pulleys 192 attached thereto and the second plurality of crank members 175 are attached to a fourth plurality of pulleys 190.
There is preferably, but not necessarily a first plurality of belts 162 each connected between the first plurality of pulleys 163 and the second plurality of pulleys 161. There is preferably, but not necessarily a second plurality of belts 195 each connected between the third plurality of pulleys 192 and the fourth plurality of pulleys 190.
There is preferably, but not necessarily, a displacement mechanism, e.g., cylinder, 154 for rotating the first shaft 228 through a rotatable offset connector 201. There is preferably, but not necessarily, a second displacement mechanism, e.g., cylinder, 197 for rotating the second shaft 229 through a rotatable offset connector 199. An illustrative, but nonlimiting, example of a cylinder includes an air cylinder with a predetermined stroke, e.g., thirty-five millimeters. Each of the first plurality of pulleys 163 is preferably greater in diameter than each of the second plurality of pulleys 161 and optimally there is a two-to-one ratio, and each of the third plurality of pulleys 192 is preferably greater in diameter than each of the fourth plurality of pulleys 190 and optimally there is a two-to-one ratio.
The first plurality of pivotally attached arms 132 and the second plurality of pivotally attached arms 172 rotates the projecting member 14, e.g., utensil, towards the base portion 12, e.g., lid, and preferably tucks or latches the projecting member 14, e.g., utensil, against the rim 16 of the base portion 12, e.g., lid.
Referring now to
A second outer support plate 380 is mounted adjacent to a second inner support plate 382. The second inner support plate 382 supports a first plurality of mold cavities 354 and a second plurality of mold cavities 386. A representative indentation for the base portion 12 of the hinged molded part 10 is indicated by numeral 387 for either the plurality of first mold cavity cavities 354 or the plurality of second mold cavity cavities 386, and a representative indentation for the projecting member 14 of the hinged molded part 10 is indicated by numeral 389 for either the either the plurality of first mold cavities 354 or the plurality of second mold cavities 386.
The second inner support plate 382 is slidably supported and moved in a reciprocal motion. Depending upon the particular injection molding machine configuration, the first inner support plate 370 may be stationary or it may be movable. A drawback to this second alternative embodiment is the requirement that the attachment member 310 must be completely removed from the injection molding system 300. There can be top entry as well as side entry with a split sprue bar or relocating components to clear a sprue bar. A robotic application consumes additional time with additional costs and expenditures that are required with a robotic application. An illustrative, but nonlimiting, example of an injection molding system utilizing robotics is disclosed in U.S. Pat. No. 7,125,244, assigned to Husky Injection Molding Systems, which issued on Oct. 24, 2006.
Other aspects, objects and advantages of the present invention can be obtained from a study of the drawings, the disclosure and the appended claims. Thus, there has been shown and described several embodiments of a novel invention. As is evident from the foregoing description, certain aspects of the present invention are not limited by the particular details of the examples illustrated herein, and it is therefore contemplated that other modifications and applications, or equivalents thereof, will occur to those skilled in the art. The terms “have,” “having,” “includes” and “including” and similar terms as used in the foregoing specification are used in the sense of “optional” or “may include” and not as “required.” Many changes, modifications, variations and other uses and applications of the present construction will, however, become apparent to those skilled in the art after considering the specification and the accompanying drawings. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention, which is limited only by the claims that follow.
