Injection molding machine

Abstract

To provide an injection molding machine capable of rotating an injection device without requiring labor for attachment and detachment of a nozzle touch rod.SOLUTION: An injection molding machine includes: an injection device 10 that injects a resin material melted in an injection cylinder 30 from a nozzle 31; a swivel pin 25 that rotatably connects the injection device 10 to a base 15 on which the injection device 10 is arranged; a fixed die 61 to which a mold 63 for molding the resin material injected from the nozzle 31 is attached; a plurality of nozzle touch rods 80 that are arranged parallel to an extension direction of the injection cylinder 30 in a state of injecting the resin material from the nozzle 31 to the mold 63 and have one end connected to a surface of the fixed die 61 on the injection device 10 side; and a housing 70 to which the plurality of nozzle touch rods 80 are arranged apart from the fixed die 61 and connected at a distance from the fixed die 61 and to which the injection device 10 is rotatably connected by a connecting pin 74 arranged on an axis of the swivel pin 25.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an injection molding machine. [Background technology]

[0002] Some injection molding machines, which perform molding by injecting molten resin in an injection cylinder into a mold, are equipped with a nozzle touch mechanism that ensures that the nozzle, which injects the molten resin into the mold, properly contacts the mold. For example, the injection molding machine described in Patent Document 1 has multiple nozzle touch guide rods that support the injection unit machine installed upright on the rear platen via air cylinders, and the air cylinders perform the nozzle touch and sprue break operations.

[0003] Furthermore, some injection molding machines have injection cylinders that extend horizontally, but some of these machines are designed with high maintainability in mind. For example, the injection molding machine described in Patent Document 2 has an injection unit that can be rotated around a support pin that connects the base and the injection unit, allowing the injection unit to be rotated when checking or maintaining the nozzle that injects molten resin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-100199 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-111020 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, the nozzle touch rod of the nozzle touch mechanism may also be arranged in an injection molding machine in which the injection cylinder extends horizontally. In this case, the multiple nozzle touch rods arranged in the injection molding machine are arranged between the injection unit and the fixed die at equal positions on the same circumference centered on the nozzle when viewed in the direction in which the injection cylinder extends, so that the force from the rods acts evenly on the fixed die to which the mold is attached.

[0006] However, when a nozzle touch rod is installed in an injection molding machine in which the injection unit is capable of rotating, the rod installed between the injection unit and the fixed die needs to be removed when the injection unit is rotated, but removing the rod when the injection unit is rotated is time-consuming. For this reason, it has been very difficult to install a nozzle touch rod, which is a rod for nozzle touch, in an injection molding machine in which the injection unit is capable of rotating, without incurring the time and effort of attaching and detaching the rod when the injection unit is rotated.

[0007] The present invention has been made in view of the above, and has as its object to provide an injection molding machine in which the injection unit can be rotated without the need to attach and detach a nozzle touch rod. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the injection molding machine of the present invention comprises: an injection device that melts a resin material in an injection cylinder having a screw disposed inside and injects the molten resin material from a nozzle; a swivel pin that rotatably connects the injection device to a base on which the injection device is disposed; a fixed die to which a mold that molds the resin material injected from the nozzle is attached; a plurality of nozzle touch rods that are arranged parallel to the extension direction of the injection cylinder when the resin material is injected from the nozzle into the mold and have one end connected to a surface of the fixed die facing the injection device; and a housing that is disposed apart from the fixed die and to which the plurality of nozzle touch rods are connected at a position away from the fixed die and to which the injection device is rotatably connected by a connection pin that is disposed on the axis of the swivel pin, and the plurality of nozzle touch rods are disposed at positions above and below the injection cylinder. [Effects of the Invention]

[0009] The injection molding machine according to the present invention has the advantage that the injection unit can be rotated without the need to attach or detach the nozzle touch rod. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a main part of an injection molding machine according to an embodiment. [Figure 2] FIG. 2 is a side view of a main part of the injection molding machine according to the embodiment. [Figure 3] FIG. 3 is a plan view of a main part of the injection molding machine according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is a detailed view of the injection bracket and its surroundings shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along the line BB in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line CC in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line DD in FIG. [Figure 9] FIG. 9 is an explanatory view showing a state in which the injection device shown in FIG. 4 is moved forward. [Figure 10] FIG. 10 is a plan view showing a state in which the injection unit is rotated around the rotation pin and the connection pin. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of an injection molding machine according to the present disclosure will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the components in the following embodiments include those that are replaceable and easily conceivable by a person skilled in the art, or those that are substantially the same.

[0012] [Embodiment] FIG. 1 is a perspective view of a main portion of an injection molding machine 1 according to an embodiment. FIG. 2 is a side view of a main portion of the injection molding machine 1 according to an embodiment. FIG. 3 is a plan view of a main portion of the injection molding machine 1 according to an embodiment. In the following description, the up-down direction of the injection molding machine 1 in a normal operating state will be referred to as the up-down direction Z of the injection molding machine 1, the upper side of the injection molding machine 1 in a normal operating state will be referred to as the upper side of the injection molding machine 1, and the lower side of the injection molding machine 1 in a normal operating state will be referred to as the lower side of the injection molding machine 1. In the following description, the longitudinal direction Y of the injection molding machine 1 will also be referred to as the longitudinal direction Y of each component having the injection molding machine 1, and the direction perpendicular to both the up-down direction Z and the longitudinal direction Y of the injection molding machine 1 will be referred to as the width direction X of the injection molding machine 1.

[0013] <Injection molding machine 1> The injection molding machine 1 according to this embodiment is configured to include a base 5, an injection unit 10, a mold clamping unit 60, and the like, which are arranged on the base 5. The base 5 is formed in a substantially rectangular parallelepiped shape, with its longitudinal direction being the longitudinal direction Y of the injection molding machine 1, and a first rail 6 is arranged on the upper surface of the base 5. Two first rails 6 are arranged on the base 5, spaced apart in the width direction X, and both of the two first rails 6 are formed to extend along the longitudinal direction of the base 5. The injection unit 10 is placed on the first rail 6 so as to be movable along the extension direction of the first rail 6, and thus the injection unit 10 is arranged so as to be movable in the longitudinal direction Y.

[0014] The mold clamping unit 60 is disposed on the base 5 on one side of the injection unit 10 in the longitudinal direction Y. The mold clamping unit 60 includes a mold clamping mechanism and opens and closes a mold 63 assembled to the mold clamping mechanism. The mold clamping unit 60 is preferably of a servo motor drive type, but may also be of a hydraulic drive type.

[0015] <Injection device 10> In the following description, the side where the mold clamping device 60 is located relative to the injection device 10 in the longitudinal direction Y will be referred to as the front or front side, and the side opposite the side where the mold clamping device 60 is located relative to the injection device 10 in the longitudinal direction Y will be referred to as the rear or rear side.

[0016] The injection device 10 includes a base 15, an injection cylinder 30, a screw 35 (see FIG. 4), a rotation mechanism 40 that rotates the screw 35, and a forward / backward movement mechanism 50 that moves the screw 35 forward and backward. The base 15 is a frame that is flat in the vertical direction Z, and has legs 16 arranged at four locations on both sides in the longitudinal direction Y and both sides in the width direction X. The four legs 16 are mounted on two first rails 6 arranged on the base 5 so as to be movable along the extension direction of the first rails 6. As a result, the base 15 is supported so as to be slidable in the longitudinal direction Y relative to the base 5.

[0017] The frame 20 is formed in the shape of a rectangular frame when viewed in the up-down direction Z. More specifically, the frame 20 has an injection bracket 21 arranged on the front side, a bearing housing 23 arranged on the rear side, and side walls 22 arranged on both sides of the injection bracket 21 and the bearing housing 23 in the width direction X, extending in the longitudinal direction Y, with both ends in the longitudinal direction Y connected to the injection bracket 21 and the bearing housing 23, respectively. The frame 20 is placed on the base 15 by connecting the injection bracket 21 to the base 15 with a pivot pin 25 (see FIG. 4 ), which will be described later, and by placing rear legs 24 formed downward from the bearing housing 23 on the base 15.

[0018] The injection cylinder 30 is attached to an injection bracket 21 of the frame 20. The injection cylinder 30 extends from the injection bracket 21 to the front side in the longitudinal direction Y, and a nozzle 31 that injects the molten resin material inside the injection cylinder 30 is disposed at the tip, i.e., the front end of the injection cylinder 30. Therefore, the injection cylinder 30 is disposed above the base 15 in the up-down direction Z and in front of the base 15 in the longitudinal direction Y.

[0019] Specifically, the injection cylinder 30 is formed in a substantially cylindrical shape, is disposed so that its axis is oriented along the longitudinal direction Y, and is provided with a heater (not shown), such as a band heater. This allows the injection cylinder 30 to melt the resin material inside. That is, the injection cylinder 30 can increase its temperature using the heater, and heats and melts the resin material inside, turning it into molten resin, which is a plasticized material. The nozzle 31 is a part that injects the molten resin material from inside the injection cylinder 30 toward the front in the longitudinal direction Y.

[0020] 4 is a cross-sectional view taken along the line AA in FIG. 3. The screw 35 is disposed inside the injection cylinder 30 and has a helical shape whose axial direction is aligned with the axial direction of the injection cylinder 30. That is, the screw 35 has a helical groove on its outer circumferential surface. The screw 35 having the helical groove is rotatable about its axial center within the injection cylinder 30. The screw 35 is disposed within the injection cylinder 30 such that the central axis of the cylinder, which is the shape of the injection cylinder 30, and the rotation axis of the screw 35 substantially coincide with each other. The screw 35 is disposed movably in the axial direction of the injection cylinder 30. The screw 35, which is rotatably disposed within the injection cylinder 30, is capable of kneading the molten resin by rotating within the injection cylinder 30. This enables the injection cylinder 30 to knead the molten resin therein.

[0021] A hopper 32 is disposed near the portion of the injection cylinder 30 that is attached to the frame 20. The hopper 32 is connected to the inside of the injection cylinder 30, and is capable of supplying pellets (not shown), which are a resin material that will become the raw resin, to the injection cylinder 30.

[0022] Furthermore, second rails 26 (see FIGS. 2 and 3) are arranged on the side walls 22 of the frame 20, located on both sides in the width direction X of the frame 20. The second rails 26 extend in the longitudinal direction Y, i.e., are formed to extend substantially parallel to the injection cylinder 30.

[0023] The rotation mechanism 40 is disposed rearward of the injection cylinder 30 in the longitudinal direction Y, and is capable of rotating the screw 35 disposed inside the injection cylinder 30 about its central axis. The rotation mechanism 40, which rotates the screw 35, has a rotation mechanism main body 41, a driving motor 43, a transmission belt 44, and a pulley 45. Of these, the rotation mechanism main body 41 has a stay 42 (see FIG. 3 ) extending in the width direction X, and the stay 42 is slidably mounted on the second rail 26 at two locations in the width direction X. As a result, the rotation mechanism main body 41 is movably mounted on the second rail 26 via the stay 42.

[0024] The driving motor 43 is disposed above the rotation mechanism main body 41. The pulley 45 is disposed in front of the rotation mechanism main body 41 and is rotatable relative to the rotation mechanism main body 41. The pulley 45 is connected to the drive shaft of the driving motor 43 via a transmission belt 44, thereby allowing the pulley 45 to rotate by the driving force of the driving motor 43 transmitted via the transmission belt 44. In this way, the pulley 45, which can rotate by the driving force transmitted from the driving motor 43, is fixed coaxially and integrally with the screw 35. In other words, the rear end side of the screw 35 in the longitudinal direction Y is connected to the pulley 45. As a result, the screw 35, which is disposed in the injection cylinder 30, can rotate integrally with the pulley 45 by the driving force transmitted from the driving motor 43 to the pulley 45.

[0025] A forward / backward movement mechanism 50 is disposed behind the rotation mechanism main body 41 in the longitudinal direction Y. The forward / backward movement mechanism 50 is capable of moving the screw 35 disposed in the injection cylinder 30 in the axial direction of the screw 35. That is, the forward / backward movement mechanism 50 is capable of moving the screw 35 forward and backward in the longitudinal direction Y. More specifically, the forward / backward movement mechanism 50 has a driving motor 51 (see FIGS. 1 and 3), a transmission belt 52, a pulley 53, and a ball screw mechanism 54 (see FIG. 4). Of these, the driving motors 51 are disposed at two locations on both sides of the bearing housing 23 of the frame 20 in the width direction X. The drive shafts of the driving motors 51 disposed at the two locations are respectively connected to the pulleys 53 via the transmission belts 52.

[0026] The pulley 53 is rotatably supported by a bearing housing 23 of the frame 20 via a bearing (not shown). A threaded portion 55 of a ball screw mechanism 54 is integrally connected to the pulley 53. The threaded portion 55 of the ball screw mechanism 54 is disposed coaxially with the screw 35, and is also disposed coaxially with the pulley 45 of the rotation mechanism main body 41. The nut portion 56 of the ball screw mechanism 54 of the forward / reverse mechanism 50 is formed in a substantially cylindrical shape, and the threaded portion 55 of the ball screw mechanism 54 is threadedly engaged with the nut portion 56.

[0027] A load cell 58 is disposed in the longitudinal direction Y between the nut portion 56 of the ball screw mechanism 54 of the forward / rearward movement mechanism 50 and the rotation mechanism main body 41 of the rotation mechanism 40. The load cell 58 is disposed behind the rotation mechanism main body 41 of the rotation mechanism 40 and in front of the nut portion 56 of the ball screw mechanism 54 of the forward / rearward movement mechanism 50.

[0028] The load cell 58 is a load measuring device that measures a load applied in the axial direction, and is composed of a strain sensor (neither of which is shown) attached to a strain body, etc. The front surface of the load cell 58 in the longitudinal direction Y is fixed integrally to the rotation mechanism main body 41 of the rotation mechanism 40, and the rear surface of the load cell 58 in the longitudinal direction Y is fixed integrally to the nut portion 56 of the ball screw mechanism 54 of the forward / rearward movement mechanism 50, making it possible to detect a load acting in the longitudinal direction Y between the rotation mechanism main body 41 and the nut portion 56.

[0029] <Mold clamping device 60> The mold clamping device 60 (see FIG. 2) is disposed in front of the injection device 10 in the longitudinal direction Y, and has a fixed die 61 and a movable die 62. The fixed die 61 is disposed on the base 5 and fixed to the base 5. The movable die 62 is disposed on the opposite side of the fixed die 61 in the longitudinal direction Y from the side where the injection device 10 is located, and can be moved in the longitudinal direction Y by a mold clamping mechanism (not shown).

[0030] A mold 63 is attached to the fixed die 61 and the movable die 62 to mold the resin material injected from the nozzle 31. The mold 63 has a fixed mold 63f attached to the fixed die 61 and a movable mold 63m attached to the movable die 62. The fixed mold 63f is attached to the surface of the fixed die 61 on the side where the movable die 62 is located, and the movable mold 63m is attached to the surface of the movable die 62 on the side where the fixed die 61 is located.

[0031] The movable mold 63m attached to the movable die 62 faces the fixed mold 63f attached to the fixed die 61, and when the movable die 62 approaches the fixed die 61, it approaches the fixed mold 63f and is combined with the fixed mold 63f. The movable mold 63m and the fixed mold 63f are combined with each other and closed together, thereby forming a space corresponding to the shape of the molded product between the movable mold 63m and the fixed mold 63f.

[0032] The fixed mold 63f has a through hole 63fp formed therein, which connects the surface of the fixed mold 63f opposite to the side where the movable mold 63m is located to the space between the movable mold 63m and the fixed mold 63f, and through which the molten resin material is injected. Furthermore, the fixed die 61 has a communication hole formed therein, which connects the through hole 63fp formed in the fixed mold 63f to a portion on the injection device 10 side in the longitudinal direction Y.

[0033] 5 is a detailed view of the injection bracket 21 and its surroundings shown in FIG. 4. The injection device 10 is rotatably connected to the base 15 on which the injection device 10 is disposed by a swivel pin 25. The swivel pin 25 protrudes upward in the vertical direction Z from the upper surface of the base 15 at a position near the front end of the base 15 in the longitudinal direction Y, and is disposed with its axial direction oriented in the vertical direction Z. That is, the swivel pin 25 is a substantially cylindrical pin disposed with its axial center direction oriented in the vertical direction Z. Since the injection bracket 21 of the frame 20 is connected to the swivel pin 25 provided on the base 15 in this manner, the injection device 10 is rotatable about the swivel pin 25 relative to the base 15.

[0034] Furthermore, the injection bracket 21 of the frame 20 can be fixed in a state where it cannot rotate around the rotation pin 25 by a fixing screw (not shown) that fixes the frame 20 to the base 15 at a position other than where the rotation pin 25 is located. Therefore, when the fixing screw is removed and the injection bracket 21 is released from the fixation by the fixing screw, it is configured to be able to rotate around the rotation pin 25 relative to the base 15.

[0035] The injection molding machine 1 also has a housing 70 and a plurality of nozzle touch rods 80. The nozzle touch rods 80 are rod-shaped members extending in the longitudinal direction Y between the mold clamping unit 60 and the injection unit 10, and one end is connected to a surface of the fixed die 61 of the mold clamping unit 60 on the injection unit 10 side. In other words, the injection unit 10 is rotatable about the rotation pin 25, but the nozzle touch rods 80 are arranged in a direction parallel to the extension direction of the injection cylinder 30 when the injection unit 10 injects a resin material from the nozzle 31 of the injection unit 10 into the mold 63 of the mold clamping unit 60.

[0036] 6 is a cross-sectional view taken along the line BB in FIG. 5. In this embodiment, three nozzle touch rods 80 are arranged. The three nozzle touch rods 80 are at substantially the same distance from the nozzle 31 when viewed in the longitudinal direction Y with the injection cylinder 30 oriented along the longitudinal direction Y. In other words, the three nozzle touch rods 80 are arranged on the line of an imaginary circle vc whose center is the center P of the nozzle 31 when viewed in the longitudinal direction Y with the injection cylinder 30 oriented along the longitudinal direction Y.

[0037] Furthermore, the three nozzle touch rods 80 are arranged at equal intervals on the line of the imaginary circle vc. In this embodiment, of the three nozzle touch rods 80, one nozzle touch rod 80 is positioned at the same position as the nozzle 31 in the width direction X, that is, the nozzle touch rod 80 is positioned directly below the nozzle 31 in the up-down direction Z.

[0038] The three nozzle touch rods 80 are arranged at equal intervals on the line of the imaginary circle vc, and therefore the other two of the three nozzle touch rods 80 are arranged at positions above the nozzle 31 in the vertical direction Z, at the same position in the vertical direction Z, and on both sides of the nozzle 31 in the width direction X. For these reasons, the three nozzle touch rods 80 are arranged at positions above and below the injection cylinder 30 in the vertical direction Z, respectively.

[0039] The nozzle touch rod 80 is connected to the fixed die 61 by rod connecting parts 65 (see FIG. 5) that are arranged on the surface of the fixed die 61 on the side where the injection device 10 is located. The rod connecting parts 65 are arranged at three locations on the fixed die 61 corresponding to the nozzle touch rods 80, and each rod connecting part 65 connects the nozzle touch rod 80 to the fixed die 61 so that the nozzle touch rod 80 can move relatively in the extension direction of the nozzle touch rod 80.

[0040] More specifically, the rod connecting portion 65 has a case portion 66 into which the nozzle touch rod 80 fits, a pedestal portion 67 which is a portion that attaches the rod connecting portion 65 to the fixed die 61, and a spring member 68 which is a biasing member that applies a biasing force to the nozzle touch rod 80. The pedestal portion 67 is formed in a substantially rectangular plate shape whose thickness direction is the longitudinal direction Y, and one surface is attached to the fixed die 61.

[0041] The case part 66 is formed in a substantially cylindrical shape with its axial direction oriented in the extension direction of the nozzle touch rod 80, and one end in the axial direction is attached to the surface of the base part 67 opposite to the surface attached to the fixed die 61. The end side of the case part 66 opposite to the side attached to the base part 67 is closed by a bottom part with a hole in the center, and the nozzle touch rod 80 is passed through the hole formed in the bottom part. As a result, the end of the nozzle touch rod 80 is located inside the case part 66.

[0042] A plate-shaped rod flange portion 85 is provided at the end of the rod connecting portion 65 of the nozzle touch rod 80 that is located inside the case portion 66. The rod flange portion 85 is a circular member whose thickness direction is the extension direction of the nozzle touch rod 80 and whose diameter is slightly smaller than the inner diameter of the case portion 66.

[0043] The spring member 68 is a so-called compression spring, and is disposed in the case portion 66 on the rear side in the longitudinal direction Y of the rod flange portion 85 of the nozzle touch rod 80. This allows the spring member 68 to apply a biasing force to the portion that becomes the bottom of the case portion 66 and the rod flange portion 85 of the nozzle touch rod 80 in directions that move them apart, i.e., it is possible to apply a biasing force to the rod flange portion 85 toward the front in the longitudinal direction Y. In other words, the spring member 68 is able to apply a biasing force to the nozzle touch rod 80 in the direction in which the nozzle touch rod 80 extends, from the side where the injection device 10 is located to the side where the fixed die 61 is located.

[0044] The housing 70 is disposed away from the fixed die 61 of the mold clamping unit 60 toward the injection unit 10. Furthermore, a plurality of nozzle touch rods 80 are connected to the housing 70 at positions away from the fixed die 61. That is, three nozzle touch rods 80 are connected to the housing 70.

[0045] More specifically, the housing 70 has a plate-like member whose thickness direction is the longitudinal direction Y and has portions to which the three nozzle touch rods 80 are connected, and the plate-like member portions of the housing 70 are located near the pivot pin 25 in the longitudinal direction Y and to the rear of the pivot pin 25. The housing 70 has rod support portions 72 that protrude forward in the longitudinal direction Y from the plate-like member, and the nozzle touch rods 80 are supported by the rod support portions 72.

[0046] A plurality of rod support portions 72 are provided at positions corresponding to the nozzle touch rods 80, and in this embodiment, the rod support portions 72 are arranged at three locations on the housing 70 corresponding to the nozzle touch rods 80. These rod support portions 72 are formed in a substantially cylindrical shape with a bottom, with the axial direction being the longitudinal direction Y, the bottom side being located at the front, and the opening side being located at the rear. The nozzle touch rod 80 is arranged to penetrate the bottom portion of the rod support portion 72. For this reason, the nozzle touch rod 80 and the rod support portions 72, i.e., the nozzle touch rod 80 and the housing 70, are capable of relative movement in the longitudinal direction Y, which is the direction in which the nozzle touch rod 80 extends.

[0047] A nut 82 that screws onto the threaded portion 81 of the nozzle touch rod 80 is disposed inside each rod support portion 72. In other words, the threaded portion 81 is formed on each of the multiple nozzle touch rods 80 in a predetermined range extending from the rear end toward the front in the extension direction of the nozzle touch rod 80, and the nut 82 screws onto the threaded portion 81 formed on the nozzle touch rod 80 in this manner.

[0048] The nut 82 is disposed within the rod support portion 72 via a bushing 83 that is disposed between the outer peripheral surface of the nut 82 and the rod support portion 72, and is supported by the rod support portion 72 so as to be immovable relative to the rod support portion 72 in the longitudinal direction Y but rotatable relative to the rod support portion 72 in the rotational direction. In other words, the nut 82 that is rotatably supported by the rod support portion 72 is rotatably supported by the housing 70 through being supported by the rod support portion 72. In this way, the nut 82 that is disposed within the rod support portion 72 so as to be immovable relative to the rod support portion 72 in the longitudinal direction Y and that threads onto the threaded portion 81 of the nozzle touch rod 80 can move integrally with the housing 70 in the axial direction of the nozzle touch rod 80 by rotating relative to the threaded portion 81 of the nozzle touch rod 80.

[0049] Further, a pulley 77 is attached to the nut 82 and is rotatable integrally with the nut 82. A plurality of pulleys 77 are attached to each of the plurality of nuts 82. The pulleys 77 are attached to the rear end of the nuts 82 in the longitudinal direction Y, and are arranged behind the rod support part 72 in the longitudinal direction Y and exposed from the rod support part 72. The pulleys 77 are arranged rotatably integrally with the nuts 82, which rotate relative to the rod support part 72.

[0050] Figure 7 is a cross-sectional view taken along line CC in Figure 5. Figure 8 is a cross-sectional view taken along line DD in Figure 5. In this embodiment, three nozzle touch rods 80 are used, and therefore three pulleys 77 attached to nuts 82 are used, corresponding to the nozzle touch rods 80. A driving motor 75 is attached to the housing 70, and a transmission belt 78 is wound around the three pulleys 77, transmitting driving force from the driving motor 75 to each pulley 77 to rotate the pulleys 77.

[0051] The drive motor 75 is attached to the front surface of the housing 70 in the longitudinal direction Y, and its output shaft passes through the housing 70 in the thickness direction of the housing 70 and extends to the rear side of the housing 70 in the longitudinal direction Y. A pulley 76 is attached to the output shaft of the drive motor 75 on the rear side of the housing 70 in the longitudinal direction Y, and a transmission belt 78 is also wound around the pulley 76 attached to the output shaft of the drive motor 75.

[0052] Furthermore, an idler 79 that adjusts the path and tension of the transmission belt 78 is disposed on the rear side of the housing 70 in the longitudinal direction Y, and the transmission belt 78 is also wound around the idler 79.

[0053] As a result, the driving force generated by the driving motor 75 is transmitted from the pulley 76 attached to the output shaft to the transmission belt 78, and then from the transmission belt 78 to the pulley 77 attached to the nut 82 that screws onto the threaded portion 81 of the nozzle touch rod 80. As a result, each pulley 77 can rotate by the driving force generated by the driving motor 75.

[0054] Furthermore, the housing 70 has a connection pin support portion 73 disposed on its front surface in the longitudinal direction Y, which supports a connection pin 74 that connects the housing 70 to the injection device 10. The connection pin support portion 73 is disposed in two locations, above and below the position of the injection cylinder 30 in the vertical direction Z, and the connection pin 74 is a member that has a substantially cylindrical shape and extends in the vertical direction Z.

[0055] In the injection device 10, the injection bracket 21 is connected to two connection pin support portions 73 via two connection pins 74. Like the pivot pin 25, the connection pin 74 is a substantially cylindrical pin arranged with its axis oriented in the up-down direction Z. The connection pin 74 is arranged on the axis of the pivot pin 25 that pivotally connects the base 15 and the injection bracket 21, i.e., on the pivot axis ax of the pivot pin 25, and the injection bracket 21 is connected to the housing 70 by the connection pin 74 so as to be rotatable relative to the housing 70. In other words, the injection device 10 is rotatably connected to the housing 70 by the connection pin 74 that is arranged on the pivot axis ax of the pivot pin 25.

[0056] A through hole 71 through which the screw 35 of the injection device 10 passes is formed in the housing 70, to which the injection device 10 is connected by the connection pin 74. The through hole 71 of the housing 70 is a hole that passes through the housing 70 in the longitudinal direction Y. The through hole 71 of the housing 70 formed in this manner is a hole that is significantly larger than the diameter of the screw 35 so that the screw 35 does not interfere with the housing 70 from inside the through hole 71 when the injection device 10 rotates relative to the housing 70 around the connection pin 74. In this embodiment, the through hole 71 of the housing 70 is a circular hole whose diameter is significantly larger than the diameter of the screw 35 (see FIG. 7).

[0057] <Action of injection molding machine 1> The injection molding machine 1 according to this embodiment has the above-described configuration, and its operation will be described below. The injection molding machine 1 repeatedly executes a cycle of injection and molding operations, with one injection and molding operation being one cycle. Each cycle includes multiple steps for injecting molding material and molding the product. Each cycle includes, for example, a mold closing step, a nozzle advancement step, an injection step, a metering and cooling step, a nozzle retreat step, a mold opening step, and a molded product extrusion step.

[0058] The mold closing process is a process in which the movable die 62 of the mold clamping device 60 is moved in a direction approaching the fixed die 61, thereby combining the movable die 63m and the fixed die 63f and forming a space corresponding to the product shape between the movable die 63m and the fixed die 63f.

[0059] The nozzle advancement process is a process in which the injection device 10 is moved forward in the longitudinal direction Y to bring the nozzle 31, which is located at the front end of the injection cylinder 30, into contact with the fixed mold 63f of the mold clamping device 60.

[0060] The injection process is a process in which molten resin, which is a resin material melted by the injection cylinder 30 of the injection device 10, is injected into the space between the movable mold 63m and the fixed mold 63f attached to the mold clamping device 60.

[0061] The metering and cooling process involves waiting for a certain period of time until the temperature of the molding resin, which is the resin material injected into the space between the fixed mold 63f and the movable mold 63m attached to the mold clamping device 60, drops and solidifies, and the molding resin becomes a molded product, while sending the molten resin to be injected in the next cycle to the end side where the nozzle 31 of the injection cylinder 30 of the injection device 10 is located, thereby preparing the resin material to be used in the next cycle.

[0062] The nozzle retraction process is a process in which the injection device 10 is moved rearward in the longitudinal direction Y to move the nozzle 31 located at the end of the injection cylinder 30 rearward away from the mold 63 attached to the mold clamping device 60.

[0063] The mold opening process is a process in which the movable die 62 is moved away from the fixed die 61 and the movable die 63m is moved away from the fixed die 63f in order to remove the molded product formed by the fixed die 63f and the movable die 63m attached to the mold clamping device 60.

[0064] The molded product extrusion process is a process in which, after the movable mold 63m is separated from the fixed mold 63f, the molded product attached to the movable mold 63m is pushed out by an extrusion device (not shown) provided in the mold clamping device 60, thereby removing the molded product from the mold 63.

[0065] <Operation of injection molding machine 1> When molding a molded product using the injection molding machine 1, these injection and molding operation cycles are repeatedly executed to continuously mold molded products. Next, the operation of the injection molding machine 1 in each of these steps will be explained, focusing on the operation of the injection unit 10.

[0066] In the nozzle advancement process, which is performed after the movable mold 63m and the fixed mold 63f are combined in the mold closing process, the drive motor 75 is driven to advance the injection device 10. FIG. 9 is an explanatory diagram showing the state in which the injection device 10 shown in FIG. 4 is advanced. When the injection device 10 is advanced, the drive motor 75 attached to the housing 70 is driven. When the drive motor 75 is driven, the drive force generated by the drive motor 75 is transmitted via a transmission belt 78 to multiple pulleys 77 attached to multiple nuts 82 arranged on the rod support portion 72. As a result, the multiple nuts 82 rotate together with the pulleys 77 within the multiple rod support portions 72. That is, the three pulleys 77 attached to the three nuts 82 rotate synchronously because the drive force is transmitted by the single transmission belt 78, and the synchronous rotation of the three pulleys 77 also causes the three nuts 82 to rotate synchronously.

[0067] Because each nut 82 is threaded onto the threaded portion 81 of the nozzle touch rod 80, when the nut 82 rotates, the nut 82 moves along the threaded portion 81 in the extending direction of the nozzle touch rod 80 as it rotates. Here, when the injection device 10 is moved forward, the drive motor 75 is rotated in a direction in which the nut 82, which moves in the extending direction of the nozzle touch rod 80 by the driving force generated by the drive motor 75, moves forward in the longitudinal direction Y. Therefore, the nut 82, which moves in the extending direction of the nozzle touch rod 80 by rotating relative to the threaded portion 81 of the nozzle touch rod 80, moves forward in the longitudinal direction Y.

[0068] The nut 82 is arranged within the rod support portion 72 and is unable to move relative to the rod support portion 72 in the longitudinal direction Y, while the housing 70 is able to move relative to the nozzle touch rod 80 in the longitudinal direction Y. Therefore, when the nut 82 moves forward in the longitudinal direction Y, the housing 70 also moves forward in the longitudinal direction Y together with the nut 82.

[0069] Because the housing 70 is connected to the injection bracket 21 of the injection device 10 by the connection pin 74, when the housing 70 moves forward in the longitudinal direction Y, the force of the movement forward is transmitted to the injection device 10 via the connection pin 74. Because the injection device 10 is connected to the base 15 by the pivot pin 25, when the injection device 10 moves forward in the longitudinal direction Y, the force of the movement forward is transmitted to the base 15 via the pivot pin 25. The base 15 to which the injection device 10 is connected by the pivot pin 25 is capable of moving in the longitudinal direction Y along a first rail 6 arranged on the base 5. Therefore, when the housing 70 moves forward in the longitudinal direction Y, the injection device 10 also moves forward in the longitudinal direction Y along the first rail 6 together with the housing 70.

[0070] Because the mold clamping unit 60 is disposed in front of the injection unit 10, when the injection unit 10 moves forward in the longitudinal direction Y, the nozzle 31 located at the front end of the injection unit 10 approaches the mold clamping unit 60. A communication hole that communicates with the fixed die 61 in the longitudinal direction Y and the through hole 63fp of the fixed mold 63f are located on an extension line of the nozzle 31 in the front direction of the mold clamping unit 60. Therefore, when the injection unit 10 moves forward in the longitudinal direction Y, the nozzle 31 passes through the communication hole formed in the fixed die 61 and comes into contact with the portion around the through hole 63fp of the fixed mold 63f. As a result, the nozzle 31 is in communication with the through hole 63fp of the fixed mold 63f.

[0071] The driving motor 75 generates a driving force in a direction to move the injection device 10 forward for a predetermined period even after the nozzle 31 comes into contact with the fixed mold 63f. In other words, when the molten resin is injected from the injection device 10 into the mold 63 in the injection process, the nozzle 31 is pressed against the fixed mold 63f so that the injected molten resin does not leak from the gap between the nozzle 31 and the mold 63.

[0072] When the nozzle 31 is in contact with the fixed mold 63f and a driving force is generated in the driving motor 75 in a direction to move the injection device 10 forward, the injection device 10 does not move forward any further, and the driving force from the driving motor 75 rotates the nut 82, causing the nozzle touch rod 80 to move rearward.

[0073] More specifically, the nozzle touch rod 80 is connected to the fixed die 61 by a rod connecting portion 65 so as to be movable relative to the fixed die 61 in the extending direction of the nozzle touch rod 80. Furthermore, a spring member 68 arranged in the rod connecting portion 65 applies a biasing force to the nozzle touch rod 80 from the side where the injection device 10 is located to the side where the fixed die 61 is located, i.e., a biasing force toward the front side in the longitudinal direction Y.

[0074] Therefore, when the drive motor 75 generates a drive force in a direction moving the injection device 10 forward while the nozzle 31 is in contact with the fixed mold 63f, the nozzle touch rod 80 moves rearward relative to the housing 70, against the biasing force of the spring member 68, within the range in which the rod flange portion 85 can move within the rod connecting portion 65. In this way, the drive motor 75 stops rotating in a state in which the nozzle touch rod 80 moves rearward in the longitudinal direction Y against the biasing force of the spring member 68, and the spring member 68 applies a biasing force forward to the nozzle touch rod 80 via the rod flange portion 85.

[0075] Even when the rotation of the drive motor 75 has stopped, the nozzle touch rod 80 is subjected to a force from the spring member 68 in a direction that moves it forward in the longitudinal direction Y. The force acting on the nozzle touch rod 80 is transmitted to the housing 70 via the nut 82 that screws onto the threaded portion 81 of the nozzle touch rod 80, and is transmitted from the housing 70 to the injection device 10 via the connection pin 74. As a result, a force acts on the injection device 10 in a direction that moves it forward in the longitudinal direction Y, so that the nozzle 31 of the injection device 10 remains pressed against the fixed mold 63f even when the rotation of the drive motor 75 has stopped.

[0076] In this way, during the nozzle advancement process, even when the nozzle 31 comes into contact with the fixed mold 63f and the rotation of the drive motor 75 stops, the nozzle 31 continues to be pressed against the fixed mold 63f due to the biasing force applied to the nozzle touch rod 80 by the spring member 68.

[0077] In the injection process, the drive motor 51 of the forward / backward movement mechanism 50 is driven to rotate the screw portion 55 of the ball screw mechanism 54, thereby moving the nut portion 56 of the ball screw mechanism 54, which is threaded onto the screw portion 55, forward in the longitudinal direction Y. As a result, the forward / backward movement mechanism 50 moves the rotation mechanism 40, to which the nut portion 56 is fixed, forward in the longitudinal direction Y, and moves the screw 35 forward together with the rotation mechanism 40 within the injection cylinder 30. In the injection process, by moving the screw 35 forward in this manner, the molten resin located in front of the screw 35 within the injection cylinder 30 is injected from the nozzle 31 into the mold 63.

[0078] In the metering and cooling process, the drive motor 43 of the rotation mechanism 40 is driven to rotate the screw 35 inside the injection cylinder 30, while the drive motor 51 of the forward / backward movement mechanism 50 is driven to move the screw 35 rearward. This causes the resin material to flow from the hopper 32 into the injection cylinder 30, and while the resin material is melted inside the injection cylinder 30, the amount of resin material to be injected in the injection process of the next cycle is metered, and the molten resin material is accumulated in the injection cylinder 30 in front of the screw 35.

[0079] In the measuring and cooling step, while measuring the resin material in this manner, the process waits for a certain period of time until the resin material injected into the mold 63 in the injection step is cooled and solidified.

[0080] In the nozzle retraction process, the drive motor 75 is driven in the direction opposite to that of the nozzle advancement process, thereby causing the injection device 10 to retract (see FIG. 4). In other words, when the drive motor 75 is driven in the direction opposite to that of the nozzle advancement process, the nut 82, which is rotated by the drive force from the drive motor 75, rotates in the direction opposite to the rotation direction during the nozzle advancement process. As a result, the nozzle touch rod 80, in which the nut 82 is threadedly engaged with the threaded portion 81, moves forward relative to the nut 82, and the nozzle touch rod 80 moves to the frontmost position in the longitudinal direction Y of the rod connecting portion 65. In other words, the nozzle touch rod 80 moves forward until the rod flange portion 85 comes into contact with the base portion 67.

[0081] Furthermore, by continuing to drive the driving motor 75 in this state, the nut 82 is moved rearward in the longitudinal direction Y relative to the nozzle touch rod 80. As a result, the housing 70, which holds the nut 82 with the rod support portion 72, moves rearward in the longitudinal direction Y, and the injection unit 10, which is connected to the housing 70 by the connection pin 74, also moves rearward together with the housing 70. Therefore, the nozzle 31 of the injection unit 10 moves rearward away from the fixed mold 63f attached to the fixed die 61 of the mold clamping unit 60.

[0082] When the nozzle 31 is pressed against the fixed mold 63f in the nozzle advancement step, the fixed mold 63f may be slightly tilted by the pressing force from the nozzle 31, and this slight tilt of the fixed mold 63f may affect the molding of the molded product. For this reason, by moving the nozzle 31 away from the fixed mold 63f in the nozzle retreat step, the force applied to the fixed mold 63f from the nozzle 31 in the nozzle advancement step can be removed, and even if the fixed mold 63f is slightly tilted, the tilt can be restored and the fixed mold 63f can be adjusted to its correct position.

[0083] In a nozzle retraction step, the injection device 10 is moved rearward to separate the nozzle 31 from the fixed mold 63f, and in a mold opening step, the movable die 62 is moved to separate the movable mold 63m from the fixed mold 63f, and in a molded product extrusion step, the molded product stuck to the movable mold 63m is pushed out and taken out.

[0084] When molding a molded product using the injection molding machine 1, these operations constitute one cycle, and by repeatedly executing these operations, molding of molded products is carried out continuously.

[0085] <Pivoting Operation of Injection Unit 10> Next, the pivoting operation of the injection unit 10 will be described. In the injection molding machine 1 according to this embodiment, the injection unit 10 can be pivoted relative to the base 15 around the pivot pin 25. For example, the injection unit 10 can be pivoted to perform maintenance on the injection molding machine 1. To pivot the injection unit 10, the injection unit 10 is moved rearward to position the nozzle 31 behind the fixed die 61, and a fixing screw (not shown) that prevents the injection bracket 21 from pivoting around the pivot pin 25 is removed. This enables the injection bracket 21 to pivot around the pivot pin 25, i.e., the injection unit 10 to pivot relative to the base 15.

[0086] 10 is a plan view showing the state in which the injection device 10 has been rotated around the rotation pin 25 and the connection pin 74. When the injection device 10 is ready to rotate, the injection device 10 is rotated relative to the base 15 around the rotation pin 25 (see FIG. 5). The injection device 10 is rotated manually by an operator of the injection molding machine 1, or by using a device (not shown) that can apply a force to the injection device 10 in the rotation direction.

[0087] Here, the injection device 10 is connected to the housing 70 by a connection pin 74 arranged on the axis of the pivot pin 25 so as to be rotatable about the connection pin 74. Therefore, when the injection device 10 is rotated, the injection device 10 rotates relatively to the housing 70 about the connection pin 74 arranged on the axis of the pivot pin 25.

[0088] In other words, even when the injection unit 10 is rotated, the housing 70 does not rotate, and therefore when the injection unit 10 is rotated, the injection unit 10 rotates with respect to the base 15 around the rotation pin 25, and rotates relatively with respect to the non-rotating housing 70 around the connection pin 74. As a result, the injection cylinder 30 of the injection unit 10, which is positioned forward of the rotation pin 25, rotates in a direction toward the side in the width direction X of the injection molding machine 1.

[0089] At this time, the multiple nozzle touch rods 80 arranged between the mold clamping device 60 and the housing 70 are positioned above and below the injection cylinder 30 in the vertical direction Z, so that the injection device 10 can rotate without the injection cylinder 30 coming into contact with the nozzle touch rods 80.

[0090] When the injection unit 10 is rotated relative to the base 15 or the housing 70 around the rotation pin 25 or the connection pin 74 in a direction in which the injection cylinder 30 faces sideways in the width direction X, the nozzle 31 located at the front end of the injection cylinder 30 becomes positioned outward in the width direction X from the position of the nozzle touch rod 80. This makes it easier for an operator operating the injection molding machine 1 to check the condition of the nozzle 31, enabling maintenance such as checking for clogging of the nozzle 31 and cleaning it. Furthermore, when the injection unit 10 is rotated, the entire injection cylinder 30 faces sideways in the width direction, allowing maintenance such as cleaning and replacement of the injection cylinder 30 and the screw 35.

[0091] <Effects of the embodiment> The injection molding machine 1 according to the above embodiment includes a pivot pin 25 that pivotally connects the injection unit 10 to the base 15, and a housing 70 to which the injection unit 10 is pivotally connected via a connection pin 74 that is arranged on the axis of the pivot pin 25. A plurality of nozzle touch rods 80 are connected to the housing 70 at a position away from the fixed die 61. That is, the nozzle touch rods 80 are not directly connected to the injection unit 10 but are connected to the housing 70, and the injection unit 10 is connected to the housing 70 so as to be pivotable about the connection pin 74 that is arranged on the axis of the pivot pin 25. As a result, when the injection unit 10 is rotated relative to the base 15, the injection unit 10 can be rotated with the nozzle touch rods 80 attached by rotating the injection unit 10 relative to the housing 70 without having to attach or detach the nozzle touch rods 80. As a result, the injection unit 10 can be rotated without the trouble of attaching or detaching the nozzle touch rods 80.

[0092] Furthermore, the plurality of nozzle touch rods 80 are rotated by the driving force from the drive motor 75, which is transmitted via the transmission belt 78, through which the plurality of pulleys 77 attached to the nuts 82 threaded onto the respective threaded portions 81, and the nuts 82 rotate together with the pulleys 77, causing the plurality of nuts 82 to rotate at the same rotational speed. As a result, the plurality of nuts 82 threaded onto the threaded portions 81 of the plurality of nozzle touch rods 80 move at the same speed in the extension direction of the nozzle touch rods 80, so that the housing 70 holding the nuts 82 can be moved in the longitudinal direction Y, and the injection device 10 can be moved together with the housing 70 in the longitudinal direction Y. As a result, the injection device 10 can be easily moved in the longitudinal direction Y, and the nozzle 31 can be easily moved forward and backward.

[0093] Furthermore, a spring member 68 of the rod connecting portion 65 that connects the nozzle touch rod 80 to the fixed die 61 applies a biasing force from the side where the injection device 10 is located toward the side where the fixed die 61 is located to the nozzle touch rod 80. Therefore, when the nozzle 31 is brought into contact with the fixed mold 63f, a biasing force in the same direction is also applied to the housing 70 and the injection device 10 via the nozzle touch rod 80. This makes it possible to more reliably press the nozzle 31 against the fixed mold 63f when the nozzle 31 is brought into contact with the fixed mold 63f. As a result, leakage of the resin material when the resin material is injected from the injection device 10 into the mold 63 can be more reliably suppressed.

[0094] Furthermore, since the multiple nozzle touch rods 80 are disposed at positions above and below the injection cylinder 30, when the injection device 10 is rotated around the rotation pin 25, the injection cylinder 30 can be rotated without coming into contact with the nozzle touch rods 80. As a result, the injection device 10 can be rotated more reliably without the trouble of attaching and detaching the nozzle touch rods 80.

[0095] Furthermore, when viewed in the longitudinal direction Y, the three nozzle touch rods 80 are arranged at equal intervals on the line of an imaginary circle vc whose center is the center P of the nozzle 31. Therefore, when the injection device 10 is moved forward or backward, even if a force acting on the nozzle touch rods 80 in the extension direction of the nozzle touch rods 80 is transmitted to the fixed die 61 via the rod connecting portion 65, the force is transmitted evenly from the three nozzle touch rods 80. This prevents the fixed die 61 from falling over due to an uneven application of force in the longitudinal direction Y, and prevents the fixed mold 63f and the movable mold 63m from being combined with a slight misalignment during the mold closing process. As a result, the fixed mold 63f and the movable mold 63m can be combined with high precision, allowing a molded product to be molded with high precision.

[0096] [Variations] In the embodiment described above, three nozzle touch rods 80 are provided, but the number of nozzle touch rods 80 may be other than this. The number and arrangement of the nozzle touch rods 80 are not important as long as the force acting from the nozzle touch rods 80 to the fixed die 61 becomes uniform when the injection device 10 is moved in the longitudinal direction Y by rotating the nut 82 that threads onto the threaded portion 81, and the nozzle touch rods 80 are arranged in positions where they do not come into contact with the injection device 10 when the injection device 10 is rotated relative to the housing 70.

[0097] Furthermore, in the above-described embodiment, the nut 82 is threaded onto the threaded portion 81 of the nozzle touch rod 80, and the driving force generated by the driving motor 75 is used to rotate the nut 82 using the transmission belt 78 and pulley 77, thereby moving the injection device 10 in the longitudinal direction Y. However, other configurations for moving the injection device 10 in the longitudinal direction Y may be used. For example, a driving motor may be provided for each nozzle touch rod 80, and the nuts 82 threaded onto the threaded portion 81 of each nozzle touch rod 80 may be rotated by individual driving motors, and the multiple nuts 82 may be rotated synchronously by matching the drive timing of the multiple driving motors. Any configuration may be used as long as the injection device 10 can be moved in the longitudinal direction Y by moving the housing 70 in the longitudinal direction Y relative to the nozzle touch rod 80.

[0098] Furthermore, in the above-described embodiment, one cycle of injection and molding operations in the injection molding machine 1 includes a nozzle advancement step and a nozzle retraction step, but when performing injection and molding operations in the injection molding machine 1, the injection device 10 does not have to be moved in the longitudinal direction Y in every cycle. After the injection device 10 has brought the nozzle 31 into contact with the fixed mold 63f by moving it forward in the longitudinal direction Y, the injection device 10 may then perform multiple cycles of injection and molding operations while keeping the nozzle 31 in contact with the fixed mold 63f. [Explanation of symbols]

[0099] 1...injection molding machine, 5...base, 6...first rail, 10...injection device, 15...base, 16...leg, 20...frame, 21...injection bracket, 22...side wall, 23...bearing housing, 24...rear leg, 25...swivel pin, 26...second rail, 30...injection cylinder, 31...nozzle, 32...hopper, 35...screw, 40...rotation mechanism, 41...rotation mechanism main body, 42...stay, 43...driving motor, 44...transmission belt, 45...pulley, 50...forward / reverse mechanism, 51...driving motor, 52...transmission belt, 53...pulley, 54...ball screw mechanism, 55...screw portion, 56...Nut portion, 58...Load cell, 60...Mold clamping device, 61...Fixed die, 62...Moving die, 63...Mold, 63f...Fixed die, 63fp...Through hole, 63m...Moving die, 65...Rod connecting portion, 66...Case portion, 67...Pedestal portion, 68...Spring member, 70...Housing, 71...Through hole, 72...Rod support portion, 73...Connecting pin support portion, 74...Connecting pin, 75...Driving motor, 76...Pulley, 77...Pulley, 78...Transmission belt, 79...Idler, 80...Nozzle touch rod, 81...Thread portion, 82...Nut, 83...Bush, 85...Rod flange portion

Claims

1. an injection device that melts a resin material in an injection cylinder having a screw disposed therein and injects the melted resin material from a nozzle; a pivot pin that pivotally connects the injection device to a base on which the injection device is disposed; a fixed die to which a metal mold for molding the resin material injected from the nozzle is attached; a plurality of nozzle touch rods arranged parallel to the extending direction of the injection cylinder when the resin material is injected from the nozzle into the mold, and one end of each of which is connected to a surface of the fixed die on the side of the injection device; a housing that is disposed apart from the fixed die, to which the plurality of nozzle touch rods are connected at positions apart from the fixed die, and to which the injection device is rotatably connected by a connection pin that is disposed on the axis of the pivot pin; Equipped with 1. An injection molding machine comprising: a plurality of nozzle touch rods disposed above and below the injection cylinder;

2. a threaded portion formed on each of the plurality of nozzle touch rods; a plurality of nuts that are threadedly engaged with the threaded portion of the nozzle touch rod, that are rotatably supported by the housing, and that move integrally with the housing in the axial direction of the nozzle touch rod by rotating relative to the threaded portion; a plurality of pulleys attached to the plurality of nuts respectively so as to be rotatable integrally with the nuts; a driving motor attached to the housing; a transmission belt that is wound around the plurality of pulleys and transmits driving force from the driving motor to each of the pulleys to rotate the pulleys; The injection molding machine according to claim 1 , comprising:

3. a rod connecting portion that connects the nozzle touch rod to the fixed die so as to be relatively movable in the extending direction of the nozzle touch rod, 3. The injection molding machine according to claim 1, wherein the rod connecting portion has a biasing member that applies a biasing force to the nozzle touch rod from a side where the injection device is located to a side where the fixed die is located in the extension direction of the nozzle touch rod.

Images