JP2009096017A - Label winding method in in-mold molding and in-mold molding system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a label winding method in an in-mold molding system which can correspond to an injection molding machine which does not need a large-scale electrification device and attracts a label to a mold by electrostatic attraction force. <P>SOLUTION: A label supply machine 1 winds the label L onto the periphery of a false core 2 by an intake by a suction means and supplies the label L wound onto the false core 2 into an injection molding mold 5A. The false core 2 has conductivity. On a winding stage 15 which winds the label onto the false core 2, the other charging electrode 81 of a static electricity electrification device 8 for electrifying the label with static electricity with the false core 2 made one charging electrode is arranged. The label L is wound onto the false core 2 by the combined use of electrification by the intake and the static electricity. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a label winding method and an in-mold molding system in in-mold molding, and more specifically, an injection molding mold in an in-mold molding system for automatically supplying a label into a mold of an injection molding machine. The present invention relates to a method and an apparatus for supplying a label to a mold.

  FIG. 1 of Japanese Patent No. 2797043 (Patent Document 1) shows a conventional in-feed method in which a label is wound around an outer periphery of a pseudo core by suction by suction means and is wound around the pseudo core in an injection mold. An apparatus and a method for supplying a label to an injection mold of a molding system are disclosed. In this conventional technique, the label is held on the pseudo core only by suction by the suction means. Then, the label adsorbed on the pseudo core is adsorbed on the inner peripheral surface of the mold using intake air.

1 and 10 of Japanese Patent Application Laid-Open No. 2007-76177 (Patent Document 2) discloses a technique in which a label made of a synthetic resin is adsorbed on a pseudo core, and then the electric charge is charged to the label. In this prior art, a charging device including a pair of electrode bars (51a, 51b) is disposed in the middle of transporting a pseudo core having a label adsorbed thereto to a mold. Then, a high voltage is applied to the pair of electrode bars to form a high voltage electric field, and the pseudo core holding the label is passed through the high voltage electric field to charge the label. The charged label is attracted to the inner surface of the mold by utilizing the electrostatic attraction force of the charge.
Japanese Patent No. 2797043 FIG. Japanese Patent Laid-Open No. 2007-76177 FIG.

  In the technique described in Patent Document 1, air suction (intake) is used to realize label adsorption and holding on a pseudo core and a mold. In the technique described in Patent Document 2, a label is passed from the pseudo core to the inner peripheral surface of the mold and attracted using the electrostatic attraction force.

  The label supply technique disclosed in Patent Document 1 cannot be applied as it is to an injection molding machine that uses an electrostatic attraction force to attract a label to a mold. In addition, the label supply technique disclosed in Patent Document 2 requires a large charging device between the stage around which the label is wound and the mold, so that the overall size of the in-mold molding system increases. Furthermore, with the label supply technology disclosed in Patent Documents 1 and 2, it is not possible to increase the speed of label adsorption work to the pseudo core.

  An object of the present invention is to wrap a label in an in-mold molding system that can correspond to an injection molding machine that attracts a label to a mold by electrostatic attraction without requiring a large charging device. It is to provide a method and an in-mold molding system for carrying out the method.

  Another object of the present invention is to perform injection molding of an in-mold molding system that can correspond to an injection molding machine that attracts a label to a mold by electrostatic attraction without requiring a large charging device. It is an object to provide an apparatus and a method for supplying a label to a mold.

  In addition to the above object, an object of the present invention is to provide a method for winding a label in an in-mold molding system capable of speeding up the operation of attracting the label to the pseudo core, and an in-mold molding system for implementing the method. It is to provide.

  The present invention is directed to a label winding method in in-mold molding in which a label is wound around a pseudo core. In the present invention, the label is wound around the pseudo core using a combination of air suction (intake) and electrostatic charging. According to the present invention, there is no need to provide a large charging device between the winding stage and the mold. In addition, the label can be supplied to an injection molding machine that uses an electrostatic attraction force to attract the label to the mold. Also in the adsorption of the label to the pseudo core, since the electrostatic adsorption force is used, the speed of the label winding operation can be increased.

  Note that it is preferable to start intake in the pseudo core before the positioning of the pseudo core on the winding position stage is completed. In this way, the winding time of the label around the pseudo core can be shortened, and the cycle time including one label winding and label supply can be shortened.

  Moreover, it is preferable that a positioning portion for winding a label is formed on the pseudo core to be used. If such a positioning part is formed, it is possible to prevent the label from being displaced when the label is wound around the pseudo core. The label winding method of the present invention is used in a molding system including at least a molding machine, a label supply machine, and a label transport machine.

  The in-mold molding system of the present invention includes an injection molding machine and a label supply device that supplies a label wound around a pseudo core to a fixed mold provided in the injection molding machine. The label winding device winds the label around the pseudo core using both air suction (intake) and electrostatic charging.

  More specifically, an apparatus for supplying a label to an injection mold of the in-mold molding system of the present invention will be described below. The label supply device winds a label around the pseudo core by suction by suction means, and supplies the label in a state of being wound around the pseudo core in an injection mold. In the present invention, the pseudo core has conductivity. Then, the other charging electrode of the electrostatic charging device for charging the label with static electricity is arranged on the winding stage for winding the label around the pseudo core, with the pseudo core as one charging electrode. By adopting such a configuration, when the label is wound around the pseudo core in the winding stage, the label can be charged. Therefore, according to the present invention, there is no need to provide a large charging device between the winding stage and the mold. In addition, the label can be supplied to an injection molding machine that uses an electrostatic attraction force to attract the label to the mold. In particular, the electrostatic charging device winds the label around the pseudo core while charging the label by applying a high voltage between the pseudo core and the other charging electrode in the process of winding the label around the pseudo core by suction. Is preferred. In this way, even when the label is attracted to the pseudo core, the electrostatic attraction force is used, so that the speed of the label winding operation can be increased.

  Moreover, it is preferable to use the electrostatic charging device that is in an operating state or a non-operating state based on a selection operation from the selection means. When such an electrostatic charging device is used, the injection molding machine to which the label supply device is applied uses the electrostatic adsorption force to adsorb the label to the inner peripheral surface of the mold, or not. Can be supplied.

  The winding stage may include a plate having a plate having a contact surface that comes into contact with the label, and a label support device that supports the label at a position facing a part of the outer peripheral surface of the pseudo core. The label supporting device preferably further includes an angle changing mechanism for changing the angle between the contact surface of the plate and the pseudo core. When the angle changing mechanism is provided, the angle between the contact surface of the plate and the pseudo core can be adjusted according to the shape of the pseudo core. As a result, the gap between the label and the portion of the outer peripheral surface of the pseudo core located on the most plate side can be reduced, and a larger suction force can be obtained.

  Furthermore, the label support device is in a first position that is retracted from the contact surface when not in operation, and is movable in two positions that move from the first position to the second position that is close to the pseudo core over the contact surface during operation. It is preferable to provide a member and a movable member driving device for driving the movable member. The movable member driving device moves the two movable members from the first position to the second position in synchronization with the winding operation of the label around the pseudo core by the suction means. The movable member is operated to return from the second position to the first position. The distance between the two movable members is determined so that the pseudo core is located between the two movable members when the two movable members 9 are in the second position. If it does in this way, since two movable members will push up a label toward a pseudo core, it can help adsorption work. Therefore, it is possible to further accelerate the speeding up of the label adsorption work to the pseudo core.

  The arrangement position of the other charging electrode or the application timing of the high voltage is determined so that the plate is not charged when a high voltage is applied to the pseudo core. This is because when the plate is charged, the electrostatic adsorption force generated between the plate and the label becomes a factor that hinders the label from being wound around the pseudo core. Therefore, in order to prevent the electrostatic adsorption force between the plate and the label from being generated as much as possible, the electrostatic charging device is configured so that the movable member separates the end of the label from the plate and then the other charging electrode and the pseudo core. It is preferable to apply a high voltage between the two.

  Furthermore, it is preferable that the area around which the label is wound is formed on the surface portion of the pseudo core as a recess that is lowered toward the center of the pseudo core from the other areas. When this configuration is adopted, when the label is adsorbed to the pseudo core by intake air, the label can be positioned with respect to the pseudo core by entering the concave portion.

  The present invention can also be grasped as an in-mold molding system including a label supply device and an injection molding machine, that is, an injection molding machine system.

  The present invention can also be understood as a method for supplying a label to an injection mold that wraps a label around the pseudo core by suction by suction means and supplies the label in a state of being wound around the pseudo core in the injection mold. it can. In the method of the present invention, a pseudo core having conductivity is used. Then, the other charging electrode of the electrostatic charging device for charging the label with static electricity is arranged on the winding stage for winding the label around the pseudo core, with the pseudo core as one charging electrode. Further, in the process of winding the label around the pseudo core by suction, the label is wound around the pseudo core while applying a high voltage between the pseudo core and the other charging electrode to charge the label.

  According to the present invention, there is no need to provide a large charging device between the winding stage and the mold, and the label is also supplied to an injection molding machine of the type that attracts the label to the mold by using electrostatic adsorption force. Benefits that can be obtained. In particular, if the label is wound around the pseudo core while the label is charged, the electrostatic attraction force is also used in the adsorption of the label to the pseudo core, so that the speed of the label winding operation can be increased. can get.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of an in-mold molding system or an injection molding machine system 3 to which a label feeder 1 that implements the label winding method of the present invention is applied. In FIG. 1, the configuration of the label supply machine 1 is not specifically shown except for the winding stage 15, but the configuration of each part of the label supply machine 1 is shown in FIGS. 2 to 6. 2 to 6 are diagrams for explanation, and some parts are exaggerated for easy understanding, and the dimensional ratio of each part is different from the actual dimensional ratio. It is. The injection molding machine 5 of the injection molding machine system 3 uses a suction air to attach a label to the inner periphery of the mold 5A. However, the label supply device of the present embodiment can naturally be applied to a known injection molding machine that mounts a label on the inner periphery of a mold using electrostatic attraction force. Note that a label supply device is configured by a moving mechanism (an arm 104 and a drive device 105 described later) that moves the label supply machine 1 and the pseudo core 2.

  As shown in FIGS. 2 and 3, the label feeder 1 for the injection mold 5A shown in FIG. 1 includes a label magazine 7 in which a large number of labels are stored, a label take-out device 9, and a label transport device. 11. Further, the label feeder 1 includes an intermediate stage 13 and a winding stage 15. The label feeder 1 supplies the label L in a state where the label L is wound around the outer periphery of the pseudo core 2 (FIG. 1) in the winding stage 15 and wound around the pseudo core 2 in the injection mold 5A.

  The label magazine 7 is arranged in a state in which the storage portion 71 that is stored in a state where a large number of labels L overlap is inclined obliquely. The label magazine 7 has a label take-out port 72 at the lower end of the storage unit 71 and a label filling port at the upper end. The label outlet 72 naturally supports the lowermost label so that the label does not fall.

  The label take-out device 9 is configured to take out the labels L one by one from the label magazine 7 and place the labels L on the intermediate stage 13. The label transport device 11 is configured to transport the label L on the intermediate stage 13 to the winding stage 15 that winds the label L around the pseudo core 2 (FIG. 1). The intermediate stage 13 is provided with a label positioning mechanism 17 that positions the position of the label L taken out by the label take-out device 9 at a correct position. The pseudo core 2 of the present embodiment is integrally formed of a conductive material and has a shape that fits inside the hollow mold 5A. A plurality of vent holes 2 b are formed in the peripheral wall portion 2 a of the pseudo core 2. As will be described later, the label L is adsorbed to the outer peripheral surface of the peripheral wall portion 2a of the pseudo core 2 by a suction force generated by sucking air from the inside of the pseudo core 2 by the suction means through the vent hole 2b.

  In the present embodiment, the label magazine 7 is arranged in such a posture that the label take-out port 72 for exposing one label is directed downward, so that the label take-out device 9 is arranged below the label take-out port 72. A label L is used to take out one label L from the label take-out port 72 and send the label L to the intermediate stage 13. The label takeout device 9 includes a suction device 93 (FIG. 3) provided with a movable suction portion 91 and a suction portion moving device 92 disposed below the label takeout port 72, and a label delivery device 94. Yes. The label take-out device 9 is disposed at a position opposite to the label take-out port 72 and receives a single label L drawn from the label take-out port 72 and rotates to send the label L to the intermediate stage 13. A conveyor device 96 having a pair of endless belts 95 is provided. The two sets of endless belts 95 are arranged at a predetermined interval. The drive source of the two sets of endless belts 95 is a common drive source (not shown). Therefore, the two sets of endless belts 95 are moving at the same speed. A suction device 93 is disposed in the space between the two sets of endless belts 95. The suction device 93 includes two suction nozzles 91 a and 91 b that are arranged at an interval as the suction portion 91. The suction unit moving device 92 includes a suction position where the suction unit 91 sucks one label L exposed from the label take-out port 72 (a position where the suction unit 91 indicated by a solid line in FIG. 2 exists) and the suction unit 91 is on standby. The suction portion 91 is swung around the rotation center C with respect to a standby position in which the suction portion 91 is placed (a position where the suction portion 91 is indicated by a broken line in FIG. 2). The suction device 93 sucks air from the two suction nozzles 91 a and 91 b until the suction portion 91 reaches the operating range of the label delivery device 94 in the process of moving the suction portion 91 from the suction position to the standby position. That is, one label L and the suction portion 91 are coupled by the suction force generated by sucking air from the two suction nozzles 91a and 91b. In the process of rotating the suction portion 91 from the suction position to the standby position, the label L is pulled out from the label magazine 7 and air is sucked from the suction nozzles 91a and 91b immediately before the label reaches the label delivery device 94. Stop that. As a result, the label L rides on the endless belt 95 of the conveyor device 96 of the label sending device 94 and is sent to the intermediate stage 13 by the rotating endless belt 95. In the present embodiment, since the label delivery device 94 transports the label using the transport conveyor device 96, one label drawn from the label take-out port 72 is not restrained to the intermediate stage 13. Sending out. The conveyor device 96 always rotates the endless belt 95 at a constant speed. When such a structure is employed, the label takeout device can be compactly arranged below the label magazine. As a result, the configuration of the label supply device can be made compact. Further, since the label can be taken out from the label magazine only by the rotation operation of the suction nozzles 91a and 91b, the structure of the label taking-out device 9 is simplified. Furthermore, when the label delivery device 94 including the conveyor device 96 is used, the taken-out label can be smoothly delivered to the intermediate stage 13 by inertia force without requiring a large installation space.

  The intermediate stage 13 includes a stage unit 14 and a label positioning mechanism 17. The stage unit 14 has a structure with a smooth surface. The stage portion 14 is formed with four through holes 16a to 16d that penetrate the stage portion 14 in the thickness direction. In FIG. 2, illustration of the through holes 16 a to 16 d provided in the stage portion 14 is omitted. The structure of the stage unit 14 is determined so that a large step or a large gap does not occur between the endless belt 95 of the transport conveyor device 96.

  The label positioning mechanism 17 according to the present embodiment includes a first stopper mechanism 19 and a second stopper mechanism 25. The first stopper mechanism 19 includes a pair of pin-shaped first stopper portions 21 that come into contact with the front end edge of the label L, and a first advance / retreat mechanism 23. The first advancing / retracting mechanism 23 projects the tip portions of the pair of first stopper portions 21 from the through holes 16a and 16b (FIG. 3) only when performing the stopper function, and the tip portions are placed on the intermediate stage 13. To be located. When the first advance / retreat mechanism 23 does not need to perform the stopper function, the first advance / retract mechanism 23 pulls the pair of first stopper portions 21 into the through holes 16a and 16b to the first retracted position that allows the label to pass. The tip of the stopper portion 21 is retracted. The second stopper mechanism 25 includes a pair of pin-shaped second stopper portions 27 that come into contact with the rear end edge of the label L, and a second advance / retreat mechanism 29. The second advancing / retracting mechanism 29 projects the tip portions of the pair of second stopper portions 27 from the through holes 16c and 16d (FIG. 3) only when exhibiting the stopper function, and the tip portions are placed on the intermediate stage 13. To be located. When the second advance / retreat mechanism 29 does not need to exhibit the stopper function, the second advancement / retraction mechanism 29 pulls the pair of second stopper portions 27 into the through holes 16a and 16b, and moves the second advancement / retraction mechanism 29 to the retracted position allowing the label to pass. The tip of the stopper portion 27 is retracted.

  In this example, a pair of pin-shaped first stopper portions 21 and a pair of second stopper portions 27 are used, but it is needless to say that each of these stopper portions may be constituted by one member. .

  In the present embodiment, the first stopper mechanism 19 projects the leading end portions of the pair of first stopper portions 21 on the surface of the stage portion 14 of the intermediate stage 13, thereby causing the label delivery device 94 of the label removal device 9 to be used. Thus, the label L fed onto the intermediate stage 13 is prevented from slipping on the surface of the stage part 14 and jumping out by the inertial force in the traveling direction D in which the winding stage 15 is located. Further, the pair of second stopper portions 27 of the second stopper mechanism 25 is opposite to the traveling direction due to the reaction when the labels that contact the pair of first stopper portions 21 of the first stopper mechanism 19 come into contact with each other. To prevent it from returning in the direction of

  In the present embodiment, the first advancing / retracting mechanism 25 of the first stopper mechanism 19 includes the first stopper portion before the label L fed from the label take-out device 9 is placed on the stage portion 14 of the intermediate stage 13. The tip of 21 is positioned on the intermediate stage 13. The second advancing / retracting mechanism 29 of the second stopper mechanism 25 receives the label from the label take-out device 9 to the stage portion 14 of the intermediate stage 13 and immediately before the label comes into contact with the first stopper portion 21. The second stopper portion 27 is positioned at the retracted position, and the front end portion of the second stopper portion 27 is positioned on the intermediate stage 13 immediately before the label L contacts the first stopper portion 21. As a result, the second stopper portion 24 does not become an obstacle when placing the label L on the stage portion 14 of the intermediate stage 13. Further, the label placed on the stage 14 of the intermediate stage 13 can be reliably stopped by the first stopper portion 21. Further, the second stopper portion 27 can reliably prevent the label from moving in the reverse direction and can position the label at the correct position.

  Thus, in the label positioning mechanism 17, the label L is sandwiched between the pair of first stopper portions 21 of the first stopper mechanism 19 and the pair of second stopper portions 27 of the second stopper mechanism 25. Thus, the position of the label L is determined to be the correct position. That is, by making the dimension of the interval W between the pair of first stopper parts 21 and the pair of second stopper parts 27 substantially coincide with the dimension measured along the traveling direction D of the label L, the label Can be positioned. In this embodiment, the stage portion 14 is configured to be separated into two blocks 14A and 14B, and the first stopper mechanism 19 is configured to be movable together with the block 14A. Therefore, according to this Embodiment, the above-mentioned space | interval W can be changed according to the difference in the shape of a label. In addition, when the block 14A and the block 14B are separated and the interval W is changed, a separately prepared auxiliary block may be fitted into the gap formed between them to prevent the gap.

  Further, in the present embodiment, there is further provided pressing means 31 for pressing the label against the stage portion 14 of the intermediate stage 13 to correct the curl (warping) of the label L. The pressing unit 31 presses the label between the plate 33 and the stage unit 14 by pressing down the plate 33 toward the stage unit 14 with a cylinder. If such a press means 31 is provided, curling (warping) of the label L can be corrected before conveyance, so that the label winding accuracy can be increased. In the present embodiment, when the first and second stopper mechanisms 19 and 25 press the label toward the intermediate stage by the plate 33 to which the pressing means 31 moves, the first and second stopper portions 21 and 27 is retracted to the retracted position. Therefore, the label L can be pressed without moving the label L in a state where the label L is positioned by the first and second stopper mechanisms 19 and 25. Therefore, the label positioning accuracy is not lowered. As described above, the first and second stopper mechanisms 19 and 25 of the present embodiment arbitrarily position the tip ends of the first and second stopper portions 21 and 27 on the intermediate stage 13 as necessary. Therefore, the presence of the first and second stopper mechanisms 19 and 25 does not cause a significant reduction in the degree of freedom in designing the label feeder 1.

  The pressing step by the pressing means 31 may be performed either after the label position is determined by the label positioning mechanism 17 or before the label position is correctly determined. In the case where the pressing is performed before the position of the label is correctly determined, after the label is stopped by the first stopper mechanism 19, the first stopper portion 21 of the first stopper mechanism 19 is retracted, The press by the press means 31 is implemented. When the pressing by the pressing means 31 is performed first, after the pressing, the first and second stopper mechanisms 19 and 25 are operated again to position the label.

  The label transport device 11 transports the label to the winding stage 15 while maintaining the position of the label L determined by the label positioning mechanism 17 (the position of the label L with respect to the traveling direction D). As shown in FIG. 5, the label transport device 11 according to the present embodiment includes a pair of chucks 35 and 37 that grip both ends of the width direction WD orthogonal to the traveling direction D of the label L, and a pair of chucks 35 and 37. The slide mechanism 39 includes a slide mechanism 39 and an operation control device 41. The pair of chucks 35 and 37 are operatively attached to one ends of arms 41 and 43 extending in the vertical direction, respectively. The other ends of the arms 41 and 43 are fixed to the tip ends of piston rods of a pair of horizontal cylinders 45 and 47 extending and contracting in the horizontal direction. The slide mechanism 39 includes a pair of chucks 35 and 37, a first position P1 (FIGS. 2 and 5) corresponding to the intermediate stage 13, and a second position P2 (FIGS. 2 and 5) corresponding to the winding stage 15. Slide between. The operation control device 41 controls the operations of the pair of chucks 35 and 37 and the slide mechanism 39. Specifically, by the operation control by the operation control device 41, first, a pair of chucks 35 and 37 hold both ends in the width direction WD orthogonal to the traveling direction D of the label L positioned by the label positioning mechanism 17. Thereafter, the horizontal cylinders 45 and 47 are operated to slide the pair of chucks 35 and 37 from the first position P1 to the second position P2. Thereafter, the pair of chucks 35 and 37 are opened, and the label L is placed on the winding stage 15. Thereafter, the horizontal cylinders 45 and 47 are operated to perform an operation of sliding the pair of chucks 35 and 37 from the second position P2 to the first position P1. When the label L is conveyed from the intermediate stage 13 to the winding stage 15 by gripping both ends of the label L with the pair of chucks 35 and 37 as in the present embodiment, the posture (positional relationship) remains positioned by the label positioning device 17. ) And the label L can be transported without being bent or distorted. Therefore, there is no need to reposition or correct the label L on the winding stage 15.

  When the intermediate stage 13 for placing a label is provided between the label take-out device 9 and the label transport device 11 as in the present embodiment, the structure of the label take-out device 9 and the structure of the label transport device 11 are arbitrary structures. It can be. Therefore, the degree of freedom in designing the label feeder 1 can be increased.

  As shown in FIGS. 6 and 7, the winding stage 15 includes a plate 51 having a contact surface 49 that contacts the label L, and supports the label L at a position facing a part of the outer peripheral surface of the pseudo core 2. A label support device 53 is provided. The label support device 53 further includes an angle changing mechanism 55 that changes the angle between the contact surface 49 of the plate 51 and the pseudo core 2. In the present embodiment, the plate 51 is supported on the free end of the link 59 that rotates about the rotation shaft 57. By rotating the link 59 around a rotation axis 57 within a predetermined angle range, the contact surface 49 is moved from a position (indicated by a broken line in FIG. 6) where the contact surface 49 becomes horizontal. It is displaced between the inclined positions (the state indicated by the solid line in FIG. 6). In the present embodiment, since the label support device 53 includes the angle changing mechanism 55, the angle between the contact surface 49 of the plate 51 and the outer peripheral surface of the pseudo core 2 is adjusted according to the shape of the pseudo core 2. can do. As a result, it is possible to reduce the gap G between the label L and the portion of the outer peripheral surface of the pseudo core 2 that is located closest to the plate side, thereby obtaining a larger suction force.

  Further, the label support device 53 includes a pair of movable members 61 and 63 (FIG. 7) and a movable member driving device 65 (FIG. 5) for driving the pair of movable members 61 and 63. As shown in FIG. 7, the pair of movable members 61 and 63 are in a first position P3 that is retracted from the contact surface 49 when not in operation, and from the first position P3 to beyond the contact surface 49 during operation. It moves to the second position P4 close to the core 2. The movable member driving device 65 moves the two movable members 61 and 63 from the first position P3 to the second position P4 in synchronization with the winding operation of the label L around the pseudo core 2 by the suction means described later. When the winding operation is completed, the two or more movable members 61 and 63 are operated so as to return from the second position P4 to the first position P3. Then, when the two movable members 61 and 63 are at the second position P4, the distance between the two movable members 61 and 63 is set so that the pseudo core 2 is located between the two movable members 61 and 63. It has been established. Accordingly, the two movable members 61 and 63 push the label L toward the pseudo core 2. When the label L is pushed up by the two movable members 61 and 63, the label is pulled by the suction force generated by sucking from the inside of the pseudo core 2 through the plurality of vent holes 2b provided in the peripheral wall portion 2a of the pseudo core 2. The suction work to be sucked onto the outer peripheral surface of the pseudo core 2 will be aided. As a result, it is possible to promote speeding up of the operation of attracting the label L to the pseudo core 2.

  Further, in the present embodiment, as shown in FIGS. 1 and 7, the label L is charged with static electricity by using the conductive pseudo core 2 as one charging electrode on the winding stage 15 for winding the label L around the pseudo core 2. The other charging electrode 81 of the electrostatic charging device 8 is disposed. The actual charging electrode 81 is arranged at a predetermined distance or more away from the plate 51 so as not to charge the surface of the plate 51 during discharging. Specifically, as shown in FIG. 1, the position is a predetermined distance above the pseudo core 2 and above the plate 51. The timing for applying the high voltage to the charging electrode 81 is such that after the movable member 61 moves upward and the end of the label L moves away from the plate 51, the application of the high voltage to the charging electrode 81 is started. The label L is charged. It is preferable to start applying a high voltage to the charging electrode 81 after the label L is separated from the plate 51 by air suction. In order to prevent charging of the plate 51, the plate 51 may be formed of a material that can prevent electrostatic charging.

  When such a configuration is adopted, the label L can be charged when the label L is wound around the pseudo core 2 in the winding stage 15. Therefore, it is not necessary to provide a large charging device between the winding stage 15 and the mold 5A. Also, the label can be supplied to an injection molding machine of a type that uses the electrostatic attraction force to attract the label L to the mold. In the present embodiment, the electrostatic charging device 8 applies a high voltage from the high voltage generator 82 between the pseudo core 2 and the other charging electrode 81 in the process of winding the label L around the pseudo core 2 by suction. The label L is wound around the pseudo core 2 while the label L is charged. Therefore, even when the label L is attracted to the pseudo core 2, since the electrostatic attraction force is used, the speed of the label winding operation can be increased. In addition, as an essential function of the label supply device, it is not always necessary to wind the label around the air intake and charge the label almost simultaneously, and the label winding onto the pseudo core 2 by air intake is completed. Of course, the label may be charged later. As a matter of course, the label in the case where the electrostatic attraction force is used is formed of a dielectric material such as a chargeable synthetic resin material.

  The charging electrode 81 includes one or more needle-like electrode portions, and is discharged while a high voltage is applied from the high voltage generator 82 to the pseudo core 2 having conductivity that is grounded to the ground. do. Due to this discharge, in the process of winding around the pseudo core 2, the label L is gradually charged from a position close to the outer peripheral surface of the pseudo core 2. The charge charged at this time generates an electrostatic adsorption force with the pseudo core 2. This electrostatic attraction force also contributes to winding the label around the pseudo core 2. The attachment position of the charging electrode 81 with respect to the pseudo core 2 is not limited to the position facing the plate 51 and the pseudo core 2 of the label support device 53 as shown in FIG. For example, the charging electrode may be disposed at the position of the charging electrode 81 ′ indicated by the wavy line in FIG. In the case where the charging electrode is disposed at the position of the charging electrode 81 ′ indicated by the wavy line in FIG. 7, the plate 51 may be formed of a material that can prevent electrostatic charging. When the pseudo core 2 is used as one electrode for discharge, the peak value and pulse width of the high voltage generated from the high voltage generator 82 are appropriately determined according to the shape of the label L and the shape of the pseudo core 2. become. Incidentally, many typical voltage peak values fall within the range of 20 to 30 kV.

  The electrostatic charging device 8 enters an operation state or a non-operation state based on a selection operation from the selection unit 83. When such an electrostatic charging device 8 is used, the injection molding machine to which the label feeder 1 is applied may or may not adsorb the label L to the inner peripheral surface of the mold 5A using the electrostatic adsorption force. Either can be supplied with a label.

  Returning to FIG. 1, the operation of an in-mold molding system (injection molding machine system) that receives a label from the label feeder 1 according to the present embodiment will be described. In FIG. 1, a member denoted by reference numeral 101A is an intake means such as a vacuum pump, and a member denoted by reference numeral 101B is an air feeding means such as a blower. The intake means 101A communicates with a hollow portion inside the pseudo core 2 through a passage 102 including a switching valve V1 and a hose. In addition, the intake means 101A communicates with the hollow portion of the mold 5A through a passage 103 including a switching valve V2 and a hose. The air supply means 101 </ b> B communicates with the hollow portion of the pseudo core 2 through the switching valve V <b> 1 and the passage 102. The pseudo core 2 is attached to an arm 104 that rotates within a predetermined angle range. The arm 104 performs both a swinging operation and a sliding operation by the driving device 105. The hollow portion of the pseudo core 2 is connected to an intake means 101A such as a vacuum pump and an air supply means 101B such as a blower by a passage 102 through a switching valve V1. The arm 104 pivots between a receiving position indicated by a solid line and a position on the vertical axis C of the injection molding machine 5 indicated by a dotted line with the reference line C2 as a rotation center. After turning, the arm 104 stops at the delivery position. Then, it moves horizontally to a position where it is inserted into the fixed mold 5A of the injection molding machine 5. Then, after the supply of the label into the fixed mold 5A is finished, the arm 104 returns to the delivery position, pivots in the reverse direction, and returns to the position indicated by the solid line in FIG.

  The fixed mold 5A is detachably attached to a known mold holder 5B in the injection molding machine 5. A movable mold 5D having a core 5C is detachably attached to a known mold holder 5E in the injection molding machine 5. The movable mold 5D is reciprocated in the horizontal direction by the operation of a mold clamping mechanism (not shown), so that the mold is opened and closed. The hollow portion on the inner surface of the fixed mold 5A is connected to the intake means 101A by a plurality of passages 5F formed in the fixed mold 5A and a passage 103 having a switching valve V2 in the middle.

  Next, the operation of supplying the label L to the fixed mold 5A will be described. First, in a state where the label L is disposed near the pseudo core 2, the switching valve V1 is switched to the intake means 4A side, and the label L is adsorbed on the outer peripheral surface of the pseudo core 2 by intake air. As shown in FIG. 7, an air flow (see arrows) is generated in the air around the outer periphery of the pseudo core 2 (see arrows), and the label L is a part of the outer periphery of the pseudo core 2 due to the air flow. Is sequentially sucked to the outer periphery of the pseudo core from the center to the both ends of the back surface, and is bent as indicated by the phantom line, and is finally wound around the outer periphery of the pseudo core 2. At this time, the pair of movable members 61 and 63 simultaneously move from the first position P3 to the second position P4. Further, the high voltage generator 82 applies a high voltage between the charging electrode 81 and the pseudo core 2 almost simultaneously with the intake air or with a time delay, and the label L is charged. The electric charge charged in the label L assists the adsorption of the label to the pseudo core 2 in cooperation with the movement of the pair of movable members 61 and 63. In addition, when the injection molding machine 5 attracts the label to the fixed mold by electrostatic attraction force without using the intake air, the label is attracted to the fixed mold by the electric charge charged to the label at this stage. Can do.

  If the intake means 101A starts the intake before positioning the pseudo core 2 on the winding stage 15, the label winding operation can be started simultaneously with the arrival of the pseudo core 2 at the winding stage 15. As a result, the cycle time can be shortened.

  In more detail, after the label L is wound and held on the pseudo core 2, the arm 104 of FIG. 1 is turned toward the position indicated by the dotted line, and the pseudo core 2 is placed on the vertical axis C of the injection molding machine 5. Move to position. When the pseudo core 2 reaches the position on the vertical axis C of the injection molding machine 5, the swivel arm 104 is moved horizontally to the fixed mold 5A side, and the pseudo core 2 is moved into the fixed mold 5A that has been opened. Insert into. And it stops at a sending-out position in the state where the label was along the inner surface of the mold 5A. Subsequently, the switching valve V <b> 1 in FIG. 1 is switched to the air feeding means 101 </ b> B side, and air is fed into the hollow portion of the pseudo core 2. The air sent into the hollow portion of the pseudo core 2 is exhausted from the plurality of air holes 2b, and the label L is sent out to the inner surface of the fixed mold 5A by the exhaust pressure at this time. Shortly before the label L is sent out to the inner surface of the fixed mold 5A, the intake air of the intake means 101A is made to act on the inner surface 52 of the fixed mold 5A by switching the switching valve V2 in advance, whereby the inner surface of the fixed mold 5A. 52 receives and holds the label L. Thus, by inserting the pseudo core 2 into the fixed mold 5A and positioning the label L along the inner surface of the mold at the delivery position, the label L is placed on the inner surface of the fixed mold 5A. The near part and the part far away from the inner surface do not exist, and the inner surface of the fixed mold 5A is uniformly aligned. For this reason, it is possible to hold the label L on the inner surface 52 of the fixed mold 5A without causing misalignment or wrinkles.

  Next, the arm 104 and the pseudo core 2 are moved horizontally to the position indicated by the dotted line. As a result, the label L remains in the fixed mold 5A. Thereafter, the core 5C of the movable mold in the mold opening position is inserted into the fixed mold 6 and the mold is closed. Thus, if the molding resin is injected into the molding space (cavity) formed between the molds 5A and 5D, a resin molded product having the label L attached to the entire periphery is obtained.

  In the said embodiment, although the label is exhibiting the substantially arc shape, the shape of the label which can be supplied with the label supply apparatus of this invention is not limited to the shape of the label of the said embodiment. For example, FIG. 8 shows an example of a label L ′ to be attached to the outer surface of an elongated box, which is positioned by the first and second stopper portions 21 and 27 of the label positioning mechanism 17 and a pair of chucks 35 of the label transport device 11. And 37 show a state in which the end located in the width direction of the label L ′ is gripped. In FIG. 8, the chuck is indicated by a broken line. When a part of the label L ′ is gripped by the chuck 37, the label L ′ can be gripped at the position indicated by reference numeral 37 ′. In this case, the starting positions of the pair of horizontal cylinders 45 and 47 may be changed.

  Further, in the pseudo core 2 used in the above embodiment, the outer peripheral surface of the peripheral wall portion 2a that adsorbs the label L has a truncated conical shape. For this reason, the label is not adsorbed at the correct position on the pseudo core 2 due to the position of the plurality of vent holes 2b formed in the pseudo core 2 or the positional relationship between the label before the adsorption and the pseudo core 2, and some deviation occurs. May occur. This deviation can be eliminated by increasing the processing accuracy of the pseudo core 2 and increasing the above-described label positioning accuracy. However, there is a demand for attracting the label to the correct position on the outer peripheral surface of the pseudo core without increasing the processing accuracy of the pseudo core and without increasing the positioning accuracy of the label more than necessary. In order to fulfill such a demand, a pseudo core 2 ′ as shown in FIGS. 9A and 9B may be used. Note that although the label is shown in the cross-sectional view of FIG. 9A, the vent hole is not shown. In the pseudo core 2 ′, the region R1 around which the label L is wound is formed as a recess that is lowered toward the central portion Co side of the pseudo core 2 ′ than the other region (region where the label is not wound) R2. That is, the area around which the label L is wound is recessed, and the label is wound around the recess. From another point of view, a label winding positioning portion is formed in the pseudo core 2 ′ by the region R1. When this configuration is adopted, when the label is adsorbed to the pseudo core by intake air, the label can be positioned with respect to the pseudo core by entering the concave portion.

  Hereinafter, the components of the invention in the case where the invention disclosed in the present specification is grasped from the viewpoint of a label supply apparatus and method to an injection mold will be described separately.

(1) A label supply device to an injection mold for supplying a label in a state in which the label is wound around the pseudo core in a state where the label is wound around the pseudo core by suction by suction means, and the pseudo core is wound inside the injection mold.
The pseudo core has conductivity,
A label supply comprising: a winding stage for winding the label around the pseudo core; and the other charging electrode of an electrostatic charging device for charging the label with static electricity using the pseudo core as one charging electrode. apparatus.

  (2) In the process of winding the label around the pseudo core by the intake air, the electrostatic charging device applies a high voltage between the pseudo core and the other charging electrode to charge the label. The label supply apparatus for an injection mold according to (1), wherein the label is wound around the pseudo core.

  (3) The label on the injection mold according to (1) or (2), wherein the electrostatic charging device is in an operating state or a non-operating state based on a selection operation from a selection unit. Feeding device.

(4) The winding stage includes a plate having a contact surface that contacts the label, and includes a label support device that supports the label at a position facing a part of the outer peripheral surface of the pseudo core,
The label support device further includes an angle changing mechanism that changes an angle between the contact surface of the plate and the pseudo core. The label to the injection mold according to the above (1) or (2) Feeding device.

  (5) In the surface portion of the pseudo core, the region around which the label is wound is formed as a concave portion that is lowered toward the center of the pseudo core from other regions. Label supply device for injection molds.

(6) The label support device is in a first position retracted from the contact surface S during non-operation, and from the first position during operation, the second position is close to the pseudo core beyond the contact surface. Two movable members that move to a position;
The two movable members are moved from the first position to the second position in synchronization with the winding operation of the label around the pseudo core by the suction means, and when the winding operation ends, the 2 A movable member driving device that returns the movable member from the second position to the first position;
(4) The distance between the two movable members is determined so that the pseudo core is positioned between the two movable members when the two movable members are in the second position. Or an apparatus for supplying a label to an injection mold according to (5).

  (7) The arrangement position of the other charging electrode or the application timing of the high voltage is determined so that the plate is not charged when the high voltage is applied to the pseudo core. A device for supplying a label to an injection mold according to 4).

  (8) The electrostatic charging device applies the high voltage between the other charging electrode and the pseudo core after the movable member separates the end of the label from the plate. An apparatus for supplying a label to an injection mold as described in 1.

  (9) An injection molding machine system comprising the label supply device according to any one of (1) to (8) and an injection molding machine.

(10) A method for supplying a label to an injection mold for supplying a label in a state where the label is wound around the pseudo core in a state where the label is wound around the pseudo core by suction by suction means, and the pseudo core is wound inside the injection mold.
Using a material having conductivity as the pseudo core,
On the winding stage for winding the label around the pseudo core, the other charging electrode of the electrostatic charging device for charging the label with static electricity is arranged using the pseudo core as one charging electrode,
In the process of winding the label around the pseudo core by the intake air, a high voltage is applied between the pseudo core and the other charging electrode to charge the label while winding the label around the pseudo core. A method of supplying a label to an injection mold characterized by the above.

It is a figure which shows roughly the structure of the injection molding machine system to which the label supply apparatus of this invention is applied. It is a figure which shows schematic structure of an example of embodiment of the label supply apparatus of this invention. It is a figure which shows schematically the state which looked at the principal part and intermediate | middle stage of the label extraction apparatus shown by the label supply apparatus of FIG. 2 from the top. It is a figure used in order to demonstrate the relationship between a pair of chuck | zipper and a label in a label conveying apparatus. It is a figure which shows roughly the state which looked at the intermediate | middle stage and the winding stage from the top. It is a figure used in order to explain the composition of the label support device in a winding stage. It is a figure used in order to explain performing label winding and charging in a winding stage. It is a figure used for description in the case of positioning and conveying a label of a different shape. (A) And (B) is sectional drawing and the side view of the pseudo core which wound the label used in order to demonstrate the structure of a different pseudo core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label supply machine 2 Pseudo core 3 Injection molding machine system 5 Injection molding machine 5A Fixed mold 7 Label magazine 8 Electrostatic charging device 81 Electrode for charging 9 Label take-out device 11 Label conveyance device 13 Intermediate stage 15 Label winding stage 17 Label positioning mechanism 19 First stopper mechanism 21 First stopper portion 25 Second stopper mechanism 27 Second stopper portion 35, 37 Chuck

Claims (6)

In in-mold molding using a pseudo core,
A label winding method comprising winding a label around a pseudo core using air suction and electrostatic charging together. The label winding method according to claim 1 is:
A label winding method comprising preparing to wind a label while moving the pseudo core after positioning of the label position on the pseudo core is completed.   The label winding method according to claim 1, wherein the pseudo core includes a label winding positioning portion.   The label winding method according to claim 1, 2 or 3 is used in a molding system comprising at least a molding machine, a label supply machine and a label transport machine. In the pseudo core used in in-mold molding,
A pseudo core characterized in that a label is wound using both air suction and electrostatic charging. An injection molding machine, a label supply machine for supplying a label to a mold provided in the injection molding machine,
A label winding device for winding a label around the pseudo core provided in the label feeder,
The label winding apparatus winds the label around the pseudo core using both air suction and electrostatic charging.

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