JP3780658B2 - Gate cutting machine and gate cutting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gate cut machine and a gate cut method suitable for use in manufacturing a molded container such as a PET bottle.
[0002]
[Prior art]
Generally, plastic materials are classified into a thermoplastic resin and a thermosetting resin due to a large difference in state change with respect to heat. This thermoplastic resin has good moldability and can be mass-produced. Due to its advantages, it is used in many industrial fields.
Using a molding material made of this thermoplastic resin, for example, in the field of manufacturing molded containers, molded containers such as plastic bottles are formed.
[0003]
Usually, such a molded container is obtained by heating and melting a plastic material by an injection molding machine to injection-mold a tube-shaped preform (material for container molding), and then a gate (injection) protruding outside the closed portion of the preform. The resin part corresponding to the gate of the molding machine mold) is cut by the gate cutting machine in the transfer path between the injection molding machine and the blow molding machine, and then the preform is introduced into the mold of the blow molding machine. It is manufactured by blowing compressed air into the preform.
[0004]
In this case, the gate cut by the gate cut machine is performed with the opening of the preform facing upward and the closing portion facing downward.
[0005]
Depending on the preform, the gate is cut with the opening portion downward and the closing portion upward.
[0006]
Such a gate cut (a gate cut performed with the preform opening facing downward) is disclosed in Japanese Patent Publication No. 4-2421 as “a device for manufacturing a hollow product, a pallet and a conveying means used in this device”. As disclosed in Japanese Patent Application Laid-Open No. 8-103945, “Preform Tray, Preform Transport Method, and Preform Feeding Device” can hold the opening end of the preform. This is performed by using a preform holding member having a receiving part.
[0007]
[Problems to be solved by the invention]
However, in this type of gate cut method, the gate is cut while the preform is held upside down and the gate is turned upward, so that the gate after the gate cut may directly adhere to the preform. .
This is because the flow of the resin in the gate in the mold for the injection molding machine needs to be good, so the gate is heated to a higher temperature than the other parts during injection molding. This is because the cutting gate falls into the preform without being cured.
As a result, defective preforms due to gate adhesion are likely to occur, and there is a problem that the yield rate of preforms is reduced.
[0008]
The present invention has been made in view of such circumstances, and by tilting the preform at the time of gate cutting, it is possible to prevent the occurrence of defective preforms due to gate adhesion, and thus the yield rate of preforms is good. An object is to provide a gate cut machine and a gate cut method capable of increasing the resistance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the gate cut machine according to claim 1 of the present invention has a mounting surface on which the preform holding member is mounted and has two positions in the circumferential direction which are a preform inverted position and a preform tilt position. An attachment / detachment portion that rotates between the drive portion, a drive portion that rotates and moves the attachment / detachment portion to the preform inverted position and the preform tilt position, and a preform on the attachment / detachment portion at the preform tilt position that is rotated and transferred by the drive portion. And a cut portion for cutting the renovation gate.
Therefore, the drive part rotates and transfers the attaching / detaching part from the preform inverted position to the preform tilting position, and the preform on the attaching / detaching part at the preform tilting position is inclined to cut the gate.
[0010]
According to a second aspect of the present invention, in the get cut machine according to the first aspect, the detachable portion is configured to be detachable from the plurality of preform holding members.
Therefore, a plurality of preforms are mounted on the attaching / detaching portion, and the plurality of preforms are inclined and the gates are simultaneously cut.
[0011]
According to a third aspect of the present invention, in the gate cut machine according to the first or second aspect, the detachable portion has a nozzle for adsorbing the preform holding member.
Therefore, by performing suction from the nozzle, the preform holding member is attracted to the detachable portion.
[0012]
According to a fourth aspect of the present invention, in the gate cut machine according to the third aspect, the preform holding member is provided with a through-hole that communicates with the preform in a preform holding state and into which the nozzle can be inserted and removed.
Therefore, the preform is adsorbed to the detachable portion by the nozzle via the preform holding member.
[0013]
According to a fifth aspect of the present invention, in the gate cut machine according to any one of the first to fourth aspects, the drive unit is composed of a cylinder that applies rotational force to the detachable unit.
Therefore, the detachable portion is rotated and transferred from the preform inverted position to the preform inclined position by the cylinder.
[0014]
According to a sixth aspect of the present invention, in the gate cut machine according to any one of the first to fifth aspects, a stopper is disposed at a preform inclined position of the attaching / detaching portion, and a positioning member corresponding to the stopper is provided in the attaching / detaching portion. It is configured to be freely advanced and retracted.
Therefore, the attaching / detaching portion is positioned at the preform inclined position by the contact of the positioning member with the stopper.
[0015]
A seventh aspect of the present invention is the gate cut machine according to any one of the first to sixth aspects, wherein the detachable portion is disposed on the side of the path for conveying the preform holding member.
Therefore, the gate is cut at the side of the path for conveying the preform holding member.
[0016]
According to an eighth aspect of the present invention, in the gate cut machine according to the seventh aspect, a chuck member capable of gripping the preform holding member is disposed on the side opposite to the attachment / detachment portion of the path so as to be movable forward and backward.
Therefore, the preform holding member is transferred between the path and the detachable portion by the chuck member.
[0017]
According to a ninth aspect of the present invention, in the gate cut machine according to the seventh or eighth aspect, a stopper for stopping the preform holding member is disposed on the side of the path opposite to the attachment / detachment portion so as to freely advance and retract.
Therefore, the preform holding member on the path is stopped by the stopper on the side of the attaching / detaching portion.
[0018]
The invention according to claim 10 (gate cutting method) is characterized in that a preform holding member in which a preform is held in an inverted state is mounted on an attaching / detaching portion at a preform inverted position, and then the attaching / detaching portion is preformed from the preform inverted position. This is a method of rotating and transferring to an inclined position and then cutting the preform gate at the preform inclined position.
Therefore, the gate is cut with the preform on the attachment / detachment portion at the preform inclined position in an inclined state.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
First, a gate cutting machine according to a first embodiment of the present invention will be described. Prior to that, a container forming system device and a preform holding member (hereinafter referred to as “mandrel”) in which the gate cutting machine is used. Will be described.
[0020]
FIG. 1 is a plan view showing the entire system apparatus in which the gate cutting machine according to the first embodiment of the present invention is used.
In the figure, a system apparatus denoted by reference numeral 1 includes an injection molding machine 2, a blow molding machine 3, a mandrel conveyance device 4, a gate cut machine 5, and a mandrel stop device 6, and is disposed on a mandrel conveyance path 7. Yes.
In the figure, arrow A indicates the mandrel transport direction.
[0021]
The injection molding machine 2 has a large number of preform molding cavities (not shown) arranged vertically and horizontally in the same plane. As a result, a molten plastic material is injected into a preform molding cavity (not shown) to form a tubular preform PF.
[0022]
The blow molding machine 3 has a mold (not shown) in which the preform PF faces the inside. As a result, compressed air is blown into the preform PF during molding to produce a molded container (not shown).
[0023]
On the preform receiving side of the blow molding machine 3, two mandrel transfer turrets 8 and 9 are rotatably arranged. Thereby, each mandrel M moves at equal intervals in the turret rotation direction, and each preform PF is conveyed to the blow molding machine 3 independently of each other in accordance with this moving operation. Further, each mandrel M after the preform is conveyed to the blow molding machine 3 is conveyed in a direction to return to the injection molding machine 2.
[0024]
The mandrel conveying device 4 has a mandrel inlet portion alignment / traverser device (not shown) for delivering the preform PF to and from the injection molding machine 2, and between the injection molding machine 2 and the blow molding machine 3. It is arranged.
[0025]
As a result, an array state (eight vertical) in which a large number of mandrels M transported from the blow molding machine 3 to the mandrel transport device 4 corresponds to the array state of the preform molding cavities (not shown) of the injection molding machine 2. X 4 in width), and this mandrel group is received in an inverted state of the preform PF from the injection molding machine 2 after injection molding and subdivided into four mandrel rows (eight mandrels M).
[0026]
Next, an embodiment of a gate cut machine will be described.
As shown in FIGS. 2 to 4, the gate cutting machine 5 includes an attaching / detaching unit 10, a driving unit 11, a cutting unit 12, a chuck member 13, and a mandrel row stopper 14, and is located on the side of the mandrel transport path 7 (see FIG. 2). 1 on the mandrel transport path 7).
[0027]
The detachable portion 10 is composed of a table having a placement surface 10 a on which a plurality of mandrels M capable of holding the preform PF upside down is placed, and is rotatably connected to the drive portion 11 via a holder 15. As a result, the detachable portion 10 is rotated and transferred in the directions indicated by the arrows c and d in FIG. 2 between the preform inverted position a and the preform inclined position b, which are 45 ° apart from each other in the circumferential direction.
[0028]
On the mounting surface 10a of the detachable portion 10, a positioning portion 16 for positioning a mandrel row (eight mandrels M) in a direction opposite to a chuck member (described later) is disposed.
The mounting surface 10 a of the detachable unit 10 is positioned on the same plane as the mandrel transport surface 7 a of the mandrel transport path 7.
[0029]
The detachable portion 10 is provided with eight through-holes 10b (only one is shown) parallel to the mandrel transport direction A of the mandrel transport path 7 and opened in the vertical direction. A nozzle 17 in which a tip portion can be inserted and removed is attached in such a manner that the nozzle 17 can advance and retract. As a result, when each nozzle 17 sucks the tip portion facing the inside of the through hole 10b in the preform holding state, the preform PF is attached (adsorbed) to the detachable portion 10 via the mandrel M in an inverted state.
[0030]
In addition, a positioning member 19 corresponding to the stopper 18 at the preform inclined position b is disposed in the detachable portion 10 so as to freely advance and retract. As a result, when the positioning member 19 comes into contact with the stopper 18, the detachable portion 10 is positioned at the preform inclined position b.
[0031]
The pivot shaft 20 of the attaching / detaching portion 10 extends in a direction parallel to the parallel direction of the nozzles 17 and is fixed to the anti-mandrel transport path side of the attaching / detaching portion 10.
[0032]
The drive unit 11 has a piston rod 11a that advances and retreats in the directions indicated by arrows e and f in FIG. 2, and from a cylinder that pivots and transfers the detachable unit 10 between the preform inverted position a and the preform inclined position b. It is fixed to the base 21 for the gate cut machine.
[0033]
The cut portion 12 has a fixed blade 12a that protrudes in a direction parallel to the mounting surface 10a of the detachable portion 10 at the preform inclined position b, and a movable blade 12b that moves forward and backward by driving the cylinder 22 with respect to the fixed blade 12a. The base 21 is disposed so as to be movable back and forth in a direction perpendicular to the mounting surface 10a of the detachable portion 10 at the preform inclined position b. Thereby, the gate B of the preform PF on the attaching / detaching portion 10 at the preform inclined position b is cut.
[0034]
The forward / backward movement in the direction perpendicular to the mounting surface 10a of the detachable portion 10 at the preform inclined position b of the cut portion 12 is performed by rotating the handle 23.
Thereby, the position of the cut part 12 can be adjusted according to the length of the preform.
[0035]
The chuck member 13 includes eight chuck members arranged in parallel to the mandrel transport path 7 in a direction parallel to the mandrel transport direction, and is disposed on the side of the mandrel transport path 7 by a cylinder 24 so as to be freely advanced and retracted. Each chuck member 13 has two fingers 13 a and 13 b that can approach and separate from each other by an actuator 25 and can grip the mandrel M. As a result, the mandrel M is transferred between the mandrel transport path 7 and the detachable unit 10.
[0036]
The mandrel row stopper 14 includes two stoppers 14a and 14b arranged in parallel with a predetermined interval in a direction parallel to the mandrel transport direction of the mandrel transport path 7, and is disposed on both sides of the chuck member 13 by cylinders 26 and 27 so as to be freely advanced and retracted. It is installed.
[0037]
As a result, as shown in FIG. 3, the mandrel row (eight mandrels M) on the mandrel transport path 7 and the mandrel row transported next to these mandrel rows on the side of the attaching / detaching unit 10 are stopped. That is, the stopper 14a shown in FIG. 5 moves forward to stop the mandrel row (eight mandrels M) on the mandrel transport path 7 on the side of the detachable portion 10, and the stopper 14b shown in FIG. Stop the mandrel string following the mandrel string.
[0038]
As shown in FIG. 1, the mandrel stop device 6 has a stopper 29 that stops the mandrel M on the mandrel transport path 7 by advancing and retreating by driving the cylinder 28, and is disposed on the anti-preform transport direction side of the mandrel transport device 4. It is installed.
[0039]
In addition, a mandrel discharging device (not shown) is appropriately disposed at a portion on the mandrel conveying path 7 from the mandrel conveying device 4 toward the blow molding machine 3.
[0040]
FIGS. 7A and 7B are a plan view and a front view showing a mandrel used in the gate cut machine according to the first embodiment of the present invention.
In the figure, the mandrel M has a mandrel body 31 and a convex body 32 and is movably disposed on the mandrel transport path 7.
[0041]
The mandrel body 31 has a planar regular quadrilateral mounting portion 31a which is the maximum outer shape. Thereby, the insertion of the mandrel M into the mandrel transport path 7 is performed under the same conditions on the four sides of the maximum outer shape of the mandrel M. The mandrel main body 31 is provided with a recess 33 that opens to the bottom surface of the mounting portion 31 a and a first intake hole 34 that communicates with the recess 33. The upper end of the mandrel main body 31 is provided with a screw hole 31a that opens laterally and communicates with the first intake hole 34, and a retaining member N that is screwed into the screw hole 31a has a distal end portion. Is attached in contact with the convex body 32.
[0042]
The convex body 32 is formed of a convex body as a preform holding portion facing the opening of the preform PF in the preform holding state, and is screwed to the upper end portion of the mandrel main body 31. The convex body 32 is provided with second intake holes 35 that open to the upper and lower end surfaces and communicate with the first intake holes 34.
[0043]
The concave portion 33 and the two intake holes 34 and 35 of the mandrel M perform their functions when the gate B is cut by the gate cut machine 5.
That is, when the gate B is cut, the mandrel M faces the tip of the nozzle 17 in the gate cutting machine 5 into the recess 33 of the mandrel M, and the preform in the preform holding state is formed from the first intake hole 34 and the second intake hole 35. The air in the reformer PF is sucked in and mounted on the detachable part 10. By doing so, the preform PF does not come off the convex body 32 even if an impact is applied to the preform PF when the gate B is cut.
[0044]
In the present embodiment, the case where the preform holding portion of the mandrel M is the convex body 32 has been described, but a concave body may be used.
[0045]
Next, the gate cutting method according to the first embodiment of the present invention will be described with reference to FIGS.
[Mandrel transfer from the mandrel transport path to the detachable part (preform inverted position)]
The mandrel row (eight mandrels M) transported from the mandrel transport device 4 shown in FIG. 1 onto the mandrel transport path 7 on the side of the detachable part 10 in the gate cutting machine 5 is shown in FIG. It is stopped by the forward movement of the stopper 14a by driving.
[0046]
At this time, when the cylinder 27 is driven, the stopper 14b moves forward on the mandrel conveying path 7 on the side of the attaching / detaching portion 10, and the next mandrel row (nine pieces) immediately before the mandrel conveying path 7 on the side of the attaching / detaching portion 10 by this stopper 14b. The mandrels M) after the eyes are also stopped.
[0047]
Then, each of the fingers 13 a and 13 b is moved forward in a direction approaching each other by driving each actuator 25, and the mandrel M is gripped, and each chuck member 13 is moved forward by driving the cylinder 24. The mandrel M is transferred from the mandrel transport path 7 onto the detachable portion 10 at the preform inverted position a.
[0048]
At this time, as shown by a two-dot chain line in FIG. 3, eight mandrels M are positioned on the side opposite to the chuck member 13 on the detachable portion 10 by the positioning portion 16. Further, as shown in FIG. 4, the nozzle 17 is positioned in the opening direction of the concave portion 33 (the through hole 10 b of the detachable portion 10) in each mandrel M.
[0049]
[Mandrel Rotation Transfer from Preform Inverted Position to Preform Inclined Position] In FIG. 4, each nozzle 17 is moved forward to be partially inserted into the recess 33 of each mandrel M, and each mandrel M is attached to the detachable portion 10. Adsorb on top.
At this time, the nozzle 17 sucks the inside of the preform PF from the first intake hole 34 and the second intake hole 35 of the mandrel M, and the preform PF is mounted on the detachable portion 10 via the mandrel M in an inverted state. .
[0050]
In FIG. 2, the holder 15 is rotated in the direction of the arrow c around the pivot shaft 20 by the forward movement of the piston rod 11 a in the direction of the arrow e by the drive of the driving unit 11, and the attachment / detachment is interlocked with the rotation operation. The part 10 is rotated and transferred from the preform inverted position a to the preform inclined position b.
At this time, as indicated by a two-dot chain line in the drawing, the positioning member 19 comes into contact with the stopper 18 and the detachable portion 10 is positioned at the preform inclined position b. Further, the gate B of the preform PF on the mandrel M is positioned between the fixed blade 12a and the movable blade 12b.
[0051]
[Gate cut]
In FIG. 2, the movable blade 12 b is moved forward toward the fixed blade 12 a by driving the cylinder 22 to cut the gate B of each preform PF on the detachable portion 10 at the preform inclined position b.
At this time, since the attaching / detaching portion 10 is positioned at a position inclined by 45 ° with respect to the horizontal plane, the gate B is cut with the preform PF on the attaching / detaching portion 10 at the preform inclined position b being inclined.
Therefore, in the present embodiment, the gate B after the gate cut falls vertically downward to prevent the gate B from adhering to the preform PF, and therefore, the generation of defective products of the preform PF due to the gate adhesion is prevented. be able to.
[0052]
[Mandrel Rotation Transfer from Preform Inclination Position to Preform Inverted Position] In FIG. 2, the arrow 15 about the pivot shaft 20 moves the holder 15 by the backward movement of the piston rod 11 a in the direction of arrow f by the drive unit 11. The attaching / detaching portion 10 interlocked with the rotating operation is rotated and transferred from the preform inclined position b to the preform inverted position a.
[0053]
[Transfer of mandrel from attachment / detachment part (preform inverted position) to mandrel transport path]
As shown in FIG. 4, the suction state between each mandrel M and the detachable portion 10 is released, and each nozzle 17 is operated backward to be pulled out of the recess 33 of each mandrel M.
Next, as shown by the solid line in FIG. 3, each chuck member 13 is moved backward by driving the cylinder 24, and the mandrel row (eight mandrels M) is transferred onto the mandrel transport path 7 on the side of the attaching / detaching unit 10. Then, the fingers 13a and 13b driven by the actuator 25 are moved backward in a direction away from each other, and the gripping state of the mandrel M by the fingers 13a and 13b of the chuck member 13 is released.
[0054]
Thereafter, in FIG. 3, the mandrel row holding the preform PF after the gate cut is conveyed to the blow molding machine 3 by the backward movement of the stopper 14 a by driving the cylinder 26.
[0055]
Then, the mandrel row in which the preform PF before the gate cut is held upside down is transferred onto the mandrel conveyance path 7 on the side of the detachable portion 10 by the backward movement of the stopper 14 b by driving the cylinder 27.
In this way, the gate can be cut by the gate cut machine on the mandrel transport path.
[0056]
In this embodiment, the case where the inclination angle of the preform at the time of gate cutting is 45 ° has been described. However, the present invention is not limited to this, and other inclination angles may be used. That is, in short, the inclination angle may be such that the gate B cut by the gate cutting machine 5 does not fall on the preform PF on the detachable portion 10 at the preform inclination position b.
[0057]
Moreover, although this embodiment demonstrated the case where it was the drive part 11 which rotates the attachment / detachment part 10 by the advancing / retreating operation | movement of the piston rod 11a, this invention is not limited to this, The attachment / detachment part 10 is directly rotated. Of course, it may be a drive unit.
[0058]
【The invention's effect】
As described above, according to the present invention, the drive part rotates and moves the attaching / detaching part from the preform inverted position to the preform tilting position, and the gate on the attaching / detaching part at the preform tilting position is tilted. Since the cutting is performed, the gate after the gate cut can fall vertically downward to prevent the gate from adhering to the preform.
[0059]
Therefore, it is possible to prevent the occurrence of defective preforms due to gate adhesion, and it is possible to increase the yield rate of preforms.
[Brief description of the drawings]
FIG. 1 is a plan view showing a usage example of a gate cutting machine according to a first embodiment of the present invention.
FIG. 2 is a front view showing the gate cutting machine according to the first embodiment of the present invention.
FIG. 3 is a plan view showing the gate cutting machine according to the first embodiment of the present invention.
FIG. 4 is a side view showing the gate cutting machine according to the first embodiment of the present invention.
FIG. 5 is a front view showing a front stopper used in the gate cut machine according to the first embodiment of the present invention.
FIG. 6 is a front view showing a rear stopper used in the gate cut machine according to the first embodiment of the present invention.
FIGS. 7A and 7B are a plan view and a front view showing a mandrel used in the gate cut machine according to the first embodiment of the present invention. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 System apparatus 2 Injection molding machine 3 Blow molding machine 4 Mandrel conveyance apparatus 5 Gate cut machine 6 Mandrel stop apparatus 7 Mandrel conveyance path 10 Removable part 10a Mounting surface 11 Drive part 12 Cut part 13 Chuck member 14 Mandrel row stopper a Preform Inverted position b Preform tilt position B Gate M Mandrel PF Preform

Claims (10)

An attachment / detachment portion having a placement surface on which the preform holding member is placed, and rotating between two positions in the circumferential direction which are the preform inverted position and the preform tilt position;
A drive unit that pivotally transfers the detachable part to the preform inverted position and the preform inclined position; and
A gate cutting machine comprising: a cutting section for cutting a preform gate on the attaching / detaching section at a preform inclined position rotated and transferred by the driving section. 2. The gate cut machine according to claim 1, wherein the attaching / detaching portion is configured to attach and detach a plurality of preform holding members. The gate cut machine according to claim 1, wherein the detachable portion has a nozzle that sucks the preform holding member. 4. The gate cut machine according to claim 3, wherein the preform holding member is provided with a through hole that communicates with the preform in a preform holding state and into which the nozzle can be inserted and removed. The gate cut machine according to any one of claims 1 to 4, wherein the driving unit includes a cylinder that applies rotational force to the detachable unit. 6. A stopper is disposed at a preform inclined position of the attachment / detachment portion, and a positioning member corresponding to the stopper is disposed in the attachment / detachment portion so as to freely advance and retract. Gate cut machine. The gate cut machine according to any one of claims 1 to 6, wherein the detachable portion is disposed on a side of a path for transporting the preform holding member. 8. The gate cut machine according to claim 7, wherein a chuck member capable of gripping the preform holding member is disposed on the side opposite to the attachment / detachment portion of the path so as to be movable forward and backward. The gate cut machine according to claim 7 or 8, wherein a stopper for stopping the preform holding member is disposed on the side of the path opposite to the attachment / detachment portion so as to freely advance and retract. A preform holding member, in which the preform is held inverted in advance, is mounted on the detachable part at the preform inverted position,
Next, this detachable part is pivotally transferred from the preform inverted position to the preform inclined position,
Thereafter, the gate of the preform is cut at the preform inclined position.

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