Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
  • B29C45/006—Joining parts moulded in separate cavities
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/1769—Handling of moulded articles or runners, e.g. sorting, stacking, grinding of runners
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
  • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor
  • B29C2045/1794—Machine parts driven by an electric motor, e.g. electric servomotor by a rotor or directly coupled electric motor, e.g. using a tubular shaft motor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
  • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers

Definitions

• the present invention relates to an apparatus associated with an injection press for molding plastic objects.
• bottle caps comprising a body and a lid which are joined by an integral hinge or by a form fitting.
• These plugs are very common, e.g. in bottles of shampoo, detergent or the like.
• the body of the cap is mounted on the bottle and the lid is movable between a closed position and an open position and vice versa.
• WO2016141461 discloses an IMC system provided with a movable member for moving the lid on the body.
• the movable member is actuated linearly by two electric servomotors along two orthogonal axes.
• the control of the servomotors is very complex and it is not ideal for printing curved paths to the movable member.
• An object of the present invention is to provide a system for molding and assembling two parts which does not have the drawbacks of the prior art.
• an apparatus for coupling a first piece and a second piece after they have been produced by injection molding, in which the apparatus can be coupled to a mold mounted on a press for injection molding capable of molding said parts, the apparatus comprising:
• a carriage which is mounted on the slide where it can perform translations in a direction of movement;
• a pivoting member which is mounted cantilevered on the carriage to rotate about an axis of rotation perpendicular to the direction of movement of the carriage, so that the rotation of the pivoting member causes the reversal of rotation; one of the two pieces and allows to couple with the other;
• a second electric drive mounted on the carriage for rotating the pivoting member so as to couple the two parts.
• the pivoting member is configured to rotate with a satellite movement around said perpendicular: this means that the pivoting member has its own longitudinal axis able to perform a revolution about said perpendicular axis while remaining at a certain distance from it.
• the apparatus comprises two drives such as the first drive, each of which can move in translation on a respective linear rail, the two rails being parallel and the pivoting member being rotatably mounted on each carriage and placed between the two carriages.
• the apparatus comprises two drives such as the second drive, each drive being mounted on the corresponding carriage to rotate the pivoting member.
• the or each first and / or second drive is a rotary electric motor (another option is eg an actuator or linear motor).
• the or each first rotary electric motor is connected to the respective carriage by means of a rotating threaded shaft mounted in engagement with a nut present in the carriage, a translation of the carriage corresponding to the rotation of the rotated shaft.
• the or each first rotary electric motor is connected to said pivoting member by means of a rotatable lanced shaft mounted to engage a gearwheel connected to the pivoting member, a rotation of the corresponding gearwheel at the rotation of the rotated shaft.
• the first and / or second drives comprise or consist of a rotary electric motor (another option is eg an actuator or linear motor).
• the apparatus comprises on said two slides a plurality of said pivoting members mounted in parallel and at a distance from each other, in which the pivoting members are all connected to the same shaft. rotating one or each second drive.
• the trajectory of the carriage and the pivoting member can be coordinated to maximize productivity.
• the apparatus can be adapted to produce a device using IMC (In-Mold Closing) or IMA (In-Mold Assembly) technology.
• IMC In-Mold Closing
• IMA In-Mold Assembly
• the pivoting member is a bar, eg in the case of plugs, configured to engage the lid and push it on the body.
• the bar preferably has larger diameter portions ("barrels") in correspondence of the points intended to touch the lid, to guarantee maximum extension of the contact and to avoid having to touch the edges of the closure plug.
• the pivoting member is a mold part into which melt is injected to mold the first part (eg a cap lid), and then the mold part is rotated to superimpose the first part. part and the second part (eg the body of a plug) and couple them to each other.
• the apparatus includes a logic unit (eg, microprocessor or A.P.I) programmed to control the first and second electrical drives and coordinate their movements.
• a logic unit eg, microprocessor or A.P.I
• the device offers many advantages, because the electric motors allow very high performances and precisions, which result in a high productivity of the apparatus and the press.
• the movement of the two motors can be programmed so that the pivoting member has a composite trajectory which remains contained within a predetermined volume, a sort of limit of safety that avoids shocks with obstacles or a component placed outside this volume.
• the apparatus comprises position sensors for determining the position of a carriage relative to the respective slideway and / or the rotation angle of a pivoting member relative to the carriage.
• the logic unit is programmed to:
• the apparatus comprises:
• a third training feasible eg. like the first or the second training
• a second mold part in which melt is injected to mold the second part (eg the body of a plug).
• the third drive serves to linearly move the second mold part along an axis orthogonal to the plane identified by said direction of movement and said axis of rotation, in order to bring the second part of that included in the pivoting member and bring together the first and the second room.
• the third drive may be a handling element already included in the press, e.g. as an oleohydraulic or mechanical drive (a means of expelling parts), or another actuator that is actuated with compressed air, oil or electricity.
• a handling element already included in the press, e.g. as an oleohydraulic or mechanical drive (a means of expelling parts), or another actuator that is actuated with compressed air, oil or electricity.
• the logical unit is programmed to:
• IMA one can first rotate the pivoting member and then move it in translation.
• the logic unit is programmed to: ⁇ initially activate the first single drive, to bring the pivoting member containing the first part of the second part;
• Another aspect of the invention relates to an injection press provided with said apparatus.
• Figure 1 shows a perspective view of a first molding apparatus according to an embodiment of IMA technology
• Figure 2 shows a top view of the first device
• Figure 3 shows a sectional view of the first apparatus in the III- ⁇ plane
• Figure 4 shows a perspective view of a second molding apparatus according to an embodiment of IMC technology
• Figure 5 shows a top view of the second apparatus
• Figure 6 shows a trajectory diagram for the first device
• Figure 8 shows a trajectory diagram for the second device.
• An example of a molded object is a plug consisting of a body (first piece) and a lid (second piece).
• the apparatuses 10 and 60 are associated with a known press and an injection mold which are not shown.
• Figure 1 shows an apparatus 10 for molding and mounting the lid and the body of a plug.
• the apparatus 10 comprises a base consisting mainly of two parallel rails 12. In the figures there are two slides 12, but in the case of large facilities it is possible to make additional slides.
• On each slide 12 is mounted a movable carriage 18 able to move longitudinally along the slide 12 by being pushed or pulled by an electric motor 30 along an axis X.
• the two carriages 18 are interconnected in the middle by one or several mold parts 40 which extend between the two carriages 18 perpendicular to the direction of travel of the carriages 18, along an axis Y.
• the number of mold parts 40 varies according to the type of mold.
• Each mold portion 40 is mounted on the carriage 18 so as to be rotatable about the Y axis with a satellite trajectory, in other words it is offset eccentrically with respect to the Y axis.
• the axis of the portion 40 rotates about the Y axis.
• the electric motor 30 is of rotary type and rotates a worm 32 whose axis is parallel to X and which is engaged with a corresponding nut in the carriage 18.
• the rotation of the worm 32 implies the advance of the carriage 18 on the slide 12 along the X axis.
• each carriage 18 On each carriage 18 is mounted a second rotary electric motor 50 whose output shaft rotates a worm 52 whose axis is parallel to X and which is engaged with the toothing of a toothed wheel 54 having as its rotation axis Y.
• the toothed wheel 54 is connected to a disk or support that supports and rotates the portion 40.
• Coordinated control of the motors 30, 50 allows the apparatus 10 to operate in IMA mode. Please see the diagrams in Figures 6 and 7, which illustrate some types of trajectory imposed on Part 40.
• the portion 40 is initially moved along the X axis, by activation of the motor 30, from a position Q to a position W. Then the motor 30 is stopped and the part 40 rotates eccentrically around the Y axis, under the effect of the activation of the motor 50, the position W at a position E in which it is turned vertically and is at a different height relative to the slide 12.
• the portion 40 is initially moved along the X axis, by activation of the motor 30, from a position G to a position H. Then activates the motor 50 at the same time as the motor 30 and their coordinated movement we obtain a composite trajectory for the part 40.
• This one starts with ex. to raise linearly relative to the slide 12 or makes a parabola concavity facing down (HI end) as it rotates about the Y axis under the effect of the activation of the motor 50.
• the portion 40 is lowered vertically until it is joined with a matrix 42 for interlocking between the cover and the body.
• a matrix 42 for interlocking between the cover and the body.
• Figures 4 and 5 show another apparatus 60 for molding and closing the cover 90 and the body 92 together with a plug ( Figure 8).
• the lid 90 and the body 92 are molded to be joined by an integral hinge.
• the section of Figure 3 is also valid for the apparatus 60.
• the apparatus 60 differs from the apparatus 10 only in the structure of the rotating part, so we will move on to the common details.
• the two carriages 18 are interconnected in the middle by one or more bars 70 which extend between the two carriages 18 perpendicular to the direction of travel of the carriages 18.
• the number of bars 70 varies according to the type of the mold.
• the toothed wheel 54 is connected to a disk 56 which eccentrically supports and rotates the bar 70.
• Each bar 70 is then mounted on the carriage 18 so as to be rotatable about a Y axis perpendicular to the X axis, remaining in a certain distance from the Y axis.
• each bar 70 is mounted on the carriage 18 so as to be able to turn around the Y axis according to a satellite movement.
• Figures 8 illustrates a type of trajectory imposed on the bar 70 (drawn as an example as a circle).
• the bar 70 is initially moved along the X axis by activation of the motor 30 from a position J to a position K; in this phase the bar 70 has moved under the cover 90.
• the motor 30 is stopped and the bar 70 rotates around the axis Y, under the effect of the activation of the motor 50, from the position K to a position L.
• the bar 70 pushes the cover 90 towards the body 92 to their click coupling (position L).
• Figure 8 also shows successive positions of the cover 90.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60991459

Family Applications (1)

Country Status (9)

Families Citing this family (1)

Family Cites Families (10)

• 2017
  • 2017-09-18 IT IT102017000104124A patent/IT201700104124A1/it unknown
• 2018
  • 2018-09-18 WO PCT/EP2018/075242 patent/WO2019053292A1/fr unknown
  • 2018-09-18 CA CA3076300A patent/CA3076300A1/en active Pending
  • 2018-09-18 CN CN201880060445.5A patent/CN111315553A/zh active Pending
  • 2018-09-18 KR KR1020207011279A patent/KR20200065008A/ko not_active Application Discontinuation
  • 2018-09-18 MX MX2020003000A patent/MX2020003000A/es unknown
  • 2018-09-18 BR BR112020005366-0A patent/BR112020005366A2/pt not_active Application Discontinuation
  • 2018-09-18 US US16/646,346 patent/US20200276740A1/en not_active Abandoned
  • 2018-09-18 EP EP18768910.4A patent/EP3684581A1/de not_active Withdrawn

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