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

[0005] ,

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

Background Art

[0002] Among injection molding machines that perform molding by injecting molten resin in an injection cylinder into a mold, there are some that have a nozzle touch mechanism that appropriately contacts the nozzle, which is the part that injects the molten resin into the mold, with the mold. For example, the injection molding machine described in Patent Document 1 stands a plurality of guide rods for nozzle touch that support an injection unit machine on a rear platen via an air cylinder, and performs nozzle touch and sprue break operations by the air cylinder.

[0003] Also, in injection molding machines, there are those in which the injection cylinder extends in the horizontal direction. Among injection molding machines in which the injection cylinder extends in the horizontal direction, there are some that are configured in consideration of high maintainability. For example, the injection molding machine described in Patent Document 2 can turn the injection device around a support pin that connects the base and the injection device. Thus, when checking or maintaining the nozzle that injects the molten resin, the injection device can be turned.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, the nozzle touch rods of the nozzle touch mechanism may also be arranged in injection molding machines in which the injection cylinder extends horizontally. In this case, the multiple nozzle touch rods arranged in the injection molding machine are positioned at equal locations on the same circumference centered on the nozzle when viewed in the extending direction of the injection cylinder, so as to ensure that the force from the rods acts equally on the fixed die to which the mold is attached, and the rods are positioned between the injection device and the fixed die.

[0006] However, when arranging a nozzle touch rod in an injection molding machine capable of rotating the injection unit, it is necessary to remove the rod positioned between the injection unit and the fixed die when rotating the injection unit. Removing the rod when rotating the injection unit is cumbersome. Therefore, it has been extremely difficult to arrange a nozzle touch rod in an injection molding machine capable of rotating the injection unit without requiring the rod to be attached and detached when the injection unit rotates.

[0007] The present invention has been made in view of the above, and aims to provide an injection molding machine that can rotate the injection device without the trouble of attaching and detaching the nozzle touch rod. [Means for solving the problem]

[0008] To solve the above-mentioned problems and achieve the objective, the injection molding machine according to the present invention comprises: an injection device that melts a resin material in an injection cylinder in which a screw is arranged inside and injects the molten resin material from a nozzle; a pivot pin that rotatably connects the injection device to a base on which the injection device is arranged; a fixed die to which a 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 in the state in which the resin material is injected from the nozzle into the mold, with one end connected to the surface of the fixed die on the side of the injection device; and a housing that is spaced 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 connecting pin arranged on the axis of the pivot pin, wherein the plurality of nozzle touch rods are arranged at a position above and below the injection cylinder. [Effects of the Invention]

[0009] The injection molding machine according to the present invention has the advantage of allowing the injection device to be rotated without the hassle of attaching and detaching the nozzle touch rod. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of the main parts of an injection molding machine according to an embodiment. [Figure 2] Figure 2 is a side view of the main parts of an injection molding machine according to an embodiment. [Figure 3] Figure 3 is a plan view of the main parts of an injection molding machine according to an embodiment. [Figure 4] Figure 4 is a cross-sectional view of AA in Figure 3. [Figure 5] Figure 5 is a detailed view of the area around the injection bracket shown in Figure 4. [Figure 6] Figure 6 is a cross-sectional view of BB in Figure 5. [Figure 7] Figure 7 is a cross-sectional view of CC in Figure 5. [Figure 8] Figure 8 is a cross-sectional view of Figure 5 using the DD method. [Figure 9] Figure 9 is an explanatory diagram showing the injection device shown in Figure 4 in an advanced position. [Figure 10] Figure 10 is a plan view showing the injection device rotated around the pivot pin and connecting pin. [Modes for carrying out the invention]

[0011] Embodiments of the injection molding machine according to this disclosure will be described in detail below with reference to the drawings. However, this embodiment does not limit the invention. Furthermore, the components in the following embodiments include those that are substituted and readily conceivable by those skilled in the art, or that are substantially identical.

[0012] [Embodiment] Figure 1 is a perspective view of the main part of the injection molding machine 1 according to the embodiment. Figure 2 is a side view of the main part of the injection molding machine 1 according to the embodiment. Figure 3 is a plan view of the main part of the injection molding machine 1 according to the embodiment. In the following description, the vertical direction in the normal operating state of the injection molding machine 1 will be described as the vertical direction Z of the injection molding machine 1, the upper side in the normal operating state of the injection molding machine 1 will be described as the upper side of the injection molding machine 1, and the lower side in the normal operating state of the injection molding machine 1 will be described 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 described as the longitudinal direction Y in each part having the injection molding machine 1, and the direction perpendicular to both the vertical direction Z and the longitudinal direction Y of the injection molding machine 1 will be described 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 includes a base 5, an injection device 10 disposed on the base 5, a mold clamping device 60, etc. 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 disposed on the upper surface of the base 5. Two first rails 6 are disposed spaced apart in the width direction X on the base 5, and both of the two first rails 6 are formed extending along the longitudinal direction of the base 5. The injection device 10 is placed movably on the first rail 6 along the extending direction of the first rail 6, and thereby, the injection device 10 is disposed movably in the longitudinal direction Y.

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

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

[0016] [[ID=1Z]] The injection device 10 includes a base 15, an injection cylinder 30, a screw 35 (see FIG. 4), a rotation mechanism 40 for rotating the screw 35, and a forward and backward movement mechanism 50 for moving the screw 35 forward and backward. The base 15 is a flat frame in the vertical direction Z, and legs 16 are disposed at four locations on both sides in the longitudinal direction Y and both sides in the width direction X. The four legs 16 are placed movably on the two first rails 6 disposed on the base 5 along the extending direction of the first rail 6. Thereby, the base 15 is supported slidably in the longitudinal direction Y with respect to the base 5.

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

[0018] The injection cylinder 30 is attached to an injection bracket 21 on the frame 20. The injection cylinder 30 extends forward from the injection bracket 21 in the longitudinal direction Y, and a nozzle 31 for injecting the molten resin material inside the injection cylinder 30 is located at its tip, i.e., the front end of the injection cylinder 30. For this reason, the injection cylinder 30 is located above the base 15 in the vertical direction Z and in front of the base 15 in the longitudinal direction Y.

[0019] More specifically, the injection cylinder 30 is formed in a substantially cylindrical shape, with its axial direction aligned with the longitudinal direction Y, and is equipped with a heater (not shown) such as a band heater. This allows the injection cylinder 30 to melt the resin material inside. In other words, the injection cylinder 30 can have its temperature raised by the heater, allowing the resin material inside to be heated and melted into molten resin, which is a plasticizing material. The nozzle 31 is the part that injects the molten resin material from inside the injection cylinder 30 toward the front in the longitudinal direction Y.

[0020] Figure 4 is a cross-sectional view of AA in Figure 3. The screw 35 is positioned inside the injection cylinder 30 and has a helical shape with its axial direction aligned with the axial direction of the injection cylinder 30; that is, the screw 35 has a helical groove on its outer surface. Thus, the screw 35, having a helical groove, is rotatable about its axis within the injection cylinder 30. Furthermore, the screw 35 is positioned so that its rotation axis substantially coincides with the central axis of the cylindrical shape of the injection cylinder 30, and the screw 35 is also positioned to be movable in the axial direction of the injection cylinder 30. The screw 35, which is rotatably positioned inside the injection cylinder 30, can knead the molten resin by rotating inside the injection cylinder 30, and therefore the injection cylinder 30 is a cylinder that can knead the molten resin inside.

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

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

[0023] The rotating mechanism 40 is positioned behind the injection cylinder 30 in the longitudinal direction Y, and is capable of rotating the screw 35, which is located inside the injection cylinder 30, around its central axis. The rotating mechanism 40 that rotates the screw 35 comprises a rotating mechanism body 41, a drive motor 43, a transmission belt 44, and a pulley 45. Of these, the rotating mechanism body 41 has a stay 42 (see Figure 3) that extends in the width direction X, and the stay 42 is slidably mounted on two second rails 26 in the width direction X. Thus, the rotating mechanism body 41 is movably mounted on the second rails 26 via the stay 42.

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

[0025] A forward / reverse mechanism 50 is positioned behind the main body 41 of the rotating mechanism in the longitudinal direction Y. The forward / reverse mechanism 50 is capable of moving the screw 35, which is located inside the injection cylinder 30, in the axial direction of the screw 35. That is, it is possible to move the screw 35 forward or backward in the longitudinal direction Y. In detail, the forward / reverse mechanism 50 has a drive motor 51 (see Figures 1 and 3), a transmission belt 52, a pulley 53, and a ball screw mechanism 54 (see Figure 4). Of these, the drive motor 51 is positioned at two locations on both sides in the width direction X of the bearing housing 23 of the frame 20. The drive shafts of the drive motors 51 positioned at the two locations are each connected to the pulley 53 via the transmission belt 52.

[0026] The pulley 53 is rotatably supported in the bearing housing 23 of the frame 20 by a bearing (not shown). The threaded portion 55 of the ball screw mechanism 54 is integrally connected to the pulley 53. The threaded portion 55 of the ball screw mechanism 54 is arranged coaxially with the screw 35 and also coaxially with respect to the pulley 45 of the rotating mechanism 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 screwed into the nut portion 56.

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

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

[0029] <Mold clamping device 60> The clamping device 60 (see Figure 2) is located 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 located on a base 5 and fixed to the base 5. The movable die 62 is located 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 is movable in the longitudinal direction Y by a clamping mechanism (not shown).

[0030] A mold 63 for molding the resin material injected from the nozzle 31 is attached to the fixed die 61 and the movable die 62. 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 side of the fixed die 61 where the movable die 62 is located, and the movable mold 63m is attached to the side of the movable die 62 where the fixed die 61 is located.

[0031] The movable mold 63m, which is attached to the movable die 62, faces the fixed mold 63f, which is attached to the fixed die 61. When the movable die 62 approaches the fixed die 61, it approaches the fixed mold 63f and engages with it. The movable mold 63m and the fixed mold 63f are engaged and closed together, creating a space between them that corresponds to the shape of the molded product.

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

[0033] Figure 5 is a detailed view of the area around the injection bracket 21 shown in Figure 4. The injection device 10 is rotatably connected to the base 15 on which the injection device 10 is placed by a pivot pin 25. The pivot pin 25 is located near the front end of the base 15 in the longitudinal direction Y, protruding upward in the vertical direction Z from the upper surface of the base 15, and is positioned with its axial direction being the vertical direction Z. In other words, the pivot pin 25 is a substantially cylindrical pin positioned with its axial direction being the vertical direction Z. The injection device 10 is rotatable around the pivot pin 25 relative to the base 15 because the injection bracket 21 of the frame 20 is connected to the pivot pin 25 provided on the base 15 in this way.

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

[0035] Furthermore, the injection molding machine 1 has a housing 70 and a plurality of nozzle touch rods 80. The nozzle touch rods 80 are rod-shaped members that extend in the longitudinal direction Y between the clamping device 60 and the injection device 10, and one end is connected to the side of the fixed die 61 of the clamping device 60 that is on the side of the injection device 10. In other words, the injection device 10 is rotatable around the pivot pin 25, but the nozzle touch rods 80 are arranged in a direction parallel to the extending direction of the injection cylinder 30 when the injection device 10 is in the state in which it is injecting resin material from the nozzle 31 of the injection device 10 into the mold 63 of the clamping device 60.

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

[0037] Furthermore, the three nozzle touch rods 80 are arranged at equal intervals along the line of a virtual circle vc. In this embodiment, one of the three nozzle touch rods 80 is positioned at the same location as the nozzle 31 in the width direction X, that is, the nozzle touch rod 80 is located directly below the nozzle 31 in the vertical direction Z.

[0038] Since the three nozzle touch rods 80 are arranged at equal intervals along the line of the virtual circle vc, the other two nozzle touch rods 80 are positioned above the nozzle 31 in the vertical direction Z, and are in the same position in the vertical direction Z, and are positioned on both sides of the nozzle 31 in the width direction X. For these reasons, the three nozzle touch rods 80 are positioned 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 portions 65 (see Figure 5) located on the side of the fixed die 61 where the injection device 10 is located. Three rod connecting portions 65 are located on the fixed die 61, corresponding to the nozzle touch rod 80, and each rod connecting portion 65 connects the nozzle touch rod 80 to the fixed die 61 so that it can move relative to the nozzle touch rod 80 in the direction of its extension.

[0040] More specifically, the rod connecting portion 65 includes a case portion 66 into which the nozzle touch rod 80 fits inside, a base portion 67 which is the part to which the rod connecting portion 65 is attached 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 base portion 67 is formed in a substantially rectangular plate shape with its thickness direction being the longitudinal direction Y, and one side is attached to the fixed die 61.

[0041] The case portion 66 is formed in a substantially cylindrical shape with its axial direction being the direction in which the nozzle touch rod 80 extends, and one end in the axial direction is attached to the opposite side of the base portion 67 from the side attached to the fixed die 61. The end of the case portion 66 opposite to the side attached to the base portion 67 is closed by a bottom with a hole in the center, and the nozzle touch rod 80 is passed through the hole formed in the bottom. As a result, the end of the nozzle touch rod 80 is located inside the case portion 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, which is located inside the case portion 66. The rod flange portion 85 is a circular member whose thickness direction is in the direction of extension 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 positioned in the case portion 66 behind the rod flange portion 85 of the nozzle touch rod 80 in the longitudinal direction Y. As a result, the spring member 68 can apply a biasing force to the bottom portion of the case portion 66 and the rod flange portion 85 of the nozzle touch rod 80 in a direction that moves them apart, that is, 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 can apply a biasing force to the nozzle touch rod 80 from the side where the injection device 10 is located in the extending direction of the nozzle touch rod 80 toward the side where the fixed die 61 is located.

[0044] The housing 70 is positioned spaced apart from the fixed die 61 of the clamping device 60 towards the injection device 10. Furthermore, multiple nozzle touch rods 80 are connected to the housing 70 at a position away from the fixed die 61. Specifically, three nozzle touch rods 80 are connected to the housing 70.

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

[0046] Multiple rod support portions 72 are provided at positions corresponding to the nozzle touch rod 80, and in this embodiment, the rod support portions 72 are arranged at three locations on the housing 70 corresponding to the nozzle touch rod 80. These rod support portions 72 are formed in a bottomed, substantially cylindrical shape with the axial direction being the longitudinal direction Y, the bottom side facing the front, and the opening side facing the rear. The nozzle touch rod 80 is positioned to pass through the bottom portion of the rod support portion 72. Therefore, the nozzle touch rod 80 and the rod support portions 72, i.e., the nozzle touch rod 80 and the housing 70, can move relative to each other in the longitudinal direction Y, which is the direction in which the nozzle touch rod 80 extends.

[0047] A nut 82 is positioned within each rod support portion 72 to be screwed onto the threaded portion 81 of the nozzle touch rod 80. In other words, each of the multiple nozzle touch rods 80 has a threaded portion 81 formed in a predetermined range extending from the rear end toward the front in the direction of extension of the nozzle touch rod 80, and the nut 82 is screwed onto the threaded portion 81 thus formed on the nozzle touch rod 80.

[0048] The nut 82 is positioned within the rod support portion 72 via a bush 83 positioned between the outer circumferential surface of the nut 82 and the rod support portion 72. The nut 82 is supported by the rod support portion 72 in such a way that it cannot move relative to the rod support portion 72 in the longitudinal direction Y, but can rotate relative to the rod support portion 72 in the rotational direction. In other words, the nut 82, which is rotatably supported by the rod support portion 72, is rotatably supported by the housing 70 by being supported by the rod support portion 72. Thus, the nut 82, which is positioned within the rod support portion 72 and cannot move relative to the rod support portion 72 in the longitudinal direction Y, and which screws onto the threaded portion 81 of the nozzle touch rod 80, can move axially in conjunction with the housing 70 by rotating relative to the threaded portion 81 of the nozzle touch rod 80.

[0049] Furthermore, a pulley 77 is attached to the nut 82, which is rotatable in conjunction with the nut 82. Multiple pulleys 77 are attached to each of the multiple nuts 82. The pulley 77 is attached to the rear end of the nut 82 in the longitudinal direction Y, and is positioned exposed from the rod support portion 72 at the rear of the rod support portion 72 in the longitudinal direction Y. The pulley 77 is rotatably positioned in conjunction with the nut 82, which rotates relative to the rod support portion 72.

[0050] Figure 7 is a cross-sectional view of Figure 5 at CC. Figure 8 is a cross-sectional view of Figure 5 at DD. In this embodiment, three nozzle touch rods 80 are used, and accordingly, three pulleys 77 are attached to the nut 82, corresponding to the nozzle touch rods 80. A drive motor 75 is mounted on the housing 70, and a transmission belt 78 is wrapped around the three pulleys 77, which rotates the pulleys 77 by transmitting driving force from the drive motor 75 to each pulley 77.

[0051] The drive motor 75 is mounted on the front surface of the housing 70 in the longitudinal direction Y, and its output shaft penetrates 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 at the rear side of the housing 70 in the longitudinal direction Y, and a transmission belt 78 is also wrapped around the pulley 76 attached to the output shaft of the drive motor 75.

[0052] Furthermore, an idler 79 is positioned behind the housing 70 in the longitudinal direction Y to adjust the path and tension of the transmission belt 78, and the transmission belt 78 is also wrapped around the idler 79.

[0053] As a result, the driving force generated by the drive motor 75 is transmitted from the pulley 76 attached to the output shaft to the transmission belt 78, and 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. This allows each pulley 77 to rotate using the driving force generated by the drive motor 75.

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

[0055] The injection device 10 has an injection bracket 21 connected by two connecting pin support parts 73 and two connecting pins 74. The connecting pins 74 are approximately cylindrical pins, arranged with their axial direction being the vertical direction Z, similar to the swivel pin 25. The connecting pins 74 are positioned on the axis of the swivel pin 25, which is rotatably connected to the base 15 and the injection bracket 21, i.e., on the swivel axis ax of the swivel pin 25. The injection bracket 21 is connected to the housing 70 by the connecting pins 74 so that it is rotatable relative to the housing 70. In other words, the injection device 10 is rotatably connected to the housing 70 by the connecting pins 74, which are positioned on the swivel axis ax of the swivel pin 25.

[0056] The housing 70, to which the injection device 10 is connected by a connecting pin 74, has a through hole 71 through which the screw 35 of the injection device 10 passes. The through hole 71 of the housing 70 is a hole that penetrates the housing 70 in the longitudinal direction Y. The through hole 71 of the housing 70 formed in this way is a hole that is significantly larger than the diameter of the screw 35 so that when the injection device 10 rotates relative to the housing 70 around the connecting pin 74, the screw 35 does not interfere with the housing 70 from the inside of the through hole 71. 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 Figure 7).

[0057] <Operation of injection molding machine 1> The injection molding machine 1 according to this embodiment includes the configuration described above, and its operation will be explained below. The injection molding machine 1 performs a cycle of injection and molding operations, with each cycle consisting of one injection and molding operation. Each cycle includes multiple steps for injecting the molding material and molding the product. Each cycle includes, for example, a mold closing step, a nozzle advancing step, an injection step, a metering and cooling step, a nozzle retracting step, a mold opening step, and a molded product extrusion step.

[0058] The mold closing process involves moving the movable die 62 of the mold clamping device 60 toward the fixed die 61, thereby combining the movable mold 63m and the fixed mold 63f, and forming a space corresponding to the shape of the product between the movable mold 63m and the fixed mold 63f.

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

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

[0061] The metering and cooling process involves waiting for a certain period of time for the molding resin, which is a resin material injected into the space between the fixed mold 63f and the movable mold 63m attached to the clamping device 60, to cool down and solidify, and for the molding resin to become a molded product. During this time, the molten resin to be injected in the next cycle is sent to the end side where the nozzle 31 of the injection cylinder 30 of the injection device 10 is located, thus preparing the resin material to be used in the next cycle.

[0062] The nozzle retraction process involves moving the injection device 10 to the rear in the longitudinal direction Y, thereby separating the nozzle 31, which is located at the end of the injection cylinder 30, from the mold 63 attached to the clamping device 60.

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

[0064] The molded product extrusion process involves separating the movable mold 63m from the fixed mold 63f, and then removing the molded product, which is still attached to the movable mold 63m, by pushing it out with an extrusion device (not shown) provided in the clamping device 60.

[0065] <Operation of injection molding machine 1> When molding a product using injection molding machine 1, the injection and molding cycle is repeatedly executed to continuously mold the product. Next, the operation of injection molding machine 1 in each of these processes will be explained, focusing on the operation of the injection device 10.

[0066] In the nozzle advancement process, which is performed after combining the movable mold 63m and the fixed mold 63f in the mold closing process, the injection device 10 is advanced by driving the drive motor 75. Figure 9 is an explanatory diagram showing the state in which the injection device 10 shown in Figure 4 has been 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 driving force generated by the drive motor 75 is transmitted via the transmission belt 78 to the multiple pulleys 77 attached to the multiple nuts 82 arranged in the rod support section 72. As a result, the multiple nuts 82 rotate together with the pulleys 77 within the multiple rod support section 72. That is, the three pulleys 77 attached to the three nuts 82 rotate synchronously because the driving force is transmitted by a single transmission belt 78, and the three nuts 82 also rotate synchronously as a result of the synchronous rotation of the three pulleys 77.

[0067] Each nut 82 is screwed onto the threaded portion 81 of the nozzle touch rod 80. Therefore, when a nut 82 rotates, it moves along the threaded portion 81 in the direction of extension of the nozzle touch rod 80. When the injection device 10 is advanced, the drive motor 75 is rotated in a direction that moves the nut 82, which moves in the direction of extension of the nozzle touch rod 80 due to the driving force generated by the drive motor 75, forward in the longitudinal direction Y. As a result, the nut 82, which moves in the direction of extension 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 positioned within the rod support portion 72 and cannot move relative to it in the longitudinal direction Y, while the housing 70 can 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 along with the nut 82 in the longitudinal direction Y.

[0069] Since the housing 70 is connected to the injection bracket 21 of the injection device 10 by a connecting pin 74, when the housing 70 moves forward in the longitudinal direction Y, the force moving forward is transmitted to the injection device 10 via the connecting pin 74. Since the injection device 10 is connected to the base 15 by a swivel pin 25, when the injection device 10 moves forward in the longitudinal direction Y, the force moving forward is transmitted to the base 15 via the swivel pin 25. The base 15 to which the injection device 10 is connected by the swivel pin 25 is capable of moving in the longitudinal direction Y along the first rail 6 which is positioned 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] Since the clamping device 60 is located in front of the injection device 10, when the injection device 10 moves forward in the longitudinal direction Y, the nozzle 31 located at the front end of the injection device 10 approaches the clamping device 60. On the extension of the nozzle 31 in the forward direction of the clamping device 60 are a communication hole that connects the fixed die 61 in the longitudinal direction Y and a through-hole 63fp of the fixed mold 63f. Therefore, when the injection device 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 area around the through-hole 63fp of the fixed mold 63f. As a result, the nozzle 31 comes into communication with the through-hole 63fp of the fixed mold 63f.

[0071] The drive motor 75 generates a driving force that moves the injection device 10 forward for a predetermined period of time, even after the nozzle 31 has come into contact with the fixed mold 63f. In other words, when molten resin is injected from the injection device 10 into the mold 63 during the injection process, the nozzle 31 is pressed against the fixed mold 63f to prevent the injected molten resin from leaking out of 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 drive motor 75 in a direction that moves the injection device 10 forward, the injection device 10 will not move any further forward. Therefore, the nut 82 rotates due to the driving force from the drive motor 75, causing the nozzle touch rod 80 to move backward.

[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 direction of extension of the nozzle touch rod 80. Furthermore, the nozzle touch rod 80 is subjected to a biasing force 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 in the longitudinal direction Y, by a spring member 68 located at the rod connecting portion 65.

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

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

[0076] Thus, during the nozzle advancement process, even when the nozzle 31 is in contact with the fixed mold 63f and the rotation of the drive motor 75 stops, the biasing force applied from the spring member 68 to the nozzle touch rod 80 keeps the nozzle 31 pressed against the fixed mold 63f.

[0077] In the injection process, the drive motor 51 of the forward / reverse mechanism 50 is driven to rotate the threaded portion 55 of the ball screw mechanism 54, thereby moving the nut portion 56 of the ball screw mechanism 54, which is screwed onto the threaded portion 55, to the front in the longitudinal direction Y. As a result, the forward / reverse mechanism 50 moves the rotating mechanism 40, to which the nut portion 56 is fixed, to the front in the longitudinal direction Y, and together with the rotating mechanism 40, moves the screw 35 forward within the injection cylinder 30. In the injection process, by moving the screw 35 forward in this way, 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 rotating mechanism 40 is driven to rotate the screw 35 inside the injection cylinder 30, while the drive motor 51 of the forward / reverse mechanism 50 is driven to move the screw 35 to the rear. This allows the resin material to enter the injection cylinder 30 from the hopper 32, melt the resin material inside the injection cylinder 30, meter the amount of resin material to be injected in the next injection cycle, and accumulate the molten resin material in the front part of the screw 35 inside the injection cylinder 30.

[0079] Furthermore, during the weighing and cooling process, while weighing the resin material in this manner, the system waits for a certain period of time until the resin material injected into the mold 63 in the injection process cools and solidifies.

[0080] In the nozzle retraction process, the drive motor 75 is driven in the opposite direction to the nozzle advancement process, thereby retracting the injection device 10 (see Figure 4). In other words, when the drive motor 75 is driven in the opposite direction to the nozzle advancement process, the nut 82, which rotates due to the driving force from the drive motor 75, rotates in the opposite direction to the rotation direction during the nozzle advancement process. As a result, the nozzle touch rod 80, which the nut 82 screws onto the threaded portion 81, moves forward relative to the nut 82, and the nozzle touch rod 80 moves to the furthest forward point in the longitudinal direction Y at the rod connection portion 65. That is, the nozzle touch rod 80 moves forward until the rod flange portion 85 contacts the base portion 67.

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

[0082] In the nozzle advancement process, when the nozzle 31 is pressed against the fixed mold 63f, the fixed mold 63f may tilt slightly due to the pressing force from the nozzle 31. This slight tilt of the fixed mold 63f can affect the molding of the molded product. Therefore, by separating the nozzle 31 from the fixed mold 63f in the nozzle retraction process, the force applied from the nozzle 31 to the fixed mold 63f during the nozzle advancement process can be removed. Even if the fixed mold 63f has tilted slightly, it can be returned to its original position and the position of the fixed mold 63f can be adjusted.

[0083] In the nozzle retraction process, the injection device 10 is moved to the rear, and the nozzle 31 is separated from the fixed mold 63f. Then, in the mold opening process, the movable die 62 is moved to separate the movable mold 63m from the fixed mold 63f. Finally, in the molded product extrusion process, the molded product, which is still attached to the movable mold 63m, is pushed out to remove the molded product.

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

[0085] <Rotational movement of the injection device 10> Next, the rotational operation of the injection device 10 will be described. In this embodiment, the injection molding machine 1 is capable of rotating the injection device 10 relative to the base 15 around the rotational pin 25. For example, during maintenance of the injection molding machine 1, the injection device 10 can be rotated for maintenance. When rotating the injection device 10, the injection device 10 is moved to the rear so that the nozzle 31 is positioned behind the fixed die 61, and a fixing screw (not shown) that prevents rotation of the injection bracket 21 around the rotational pin 25 is removed. This makes it possible to rotate the injection bracket 21 around the rotational pin 25, that is, to rotate the injection device 10 relative to the base 15.

[0086] Figure 10 is a plan view showing the injection device 10 rotated around the pivot pin 25 and the connecting pin 74. Once the injection device 10 is ready to rotate, it is rotated around the pivot pin 25 (see Figure 5) relative to the base 15. The rotation of the injection device 10 can be performed manually by the operator of the injection molding machine 1, or by using a device (not shown) that can apply a force in the rotational direction to the injection device 10.

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

[0088] In other words, even when the injection device 10 rotates, the housing 70 does not rotate. Therefore, when the injection device 10 is rotated, the injection device 10 rotates relative to the base 15 around the pivot pin 25, and also rotates relative to the non-rotating housing 70 around the connecting pin 74. As a result, the injection cylinder 30, which is located in front of the position of the pivot pin 25, rotates in a direction toward the side in the width direction X of the injection molding machine 1.

[0089] In this configuration, the multiple nozzle touch rods 80, which are positioned between the clamping device 60 and the housing 70, are positioned above and below the injection cylinder 30 in the vertical Z direction. As a result, the injection device 10 can rotate without the injection cylinder 30 coming into contact with the nozzle touch rods 80.

[0090] When the injection device 10 is rotated relative to the base 15 and housing 70, with the injection cylinder 30 facing laterally in the width direction X, around the pivot pin 25 and connecting pin 74, the nozzle 31 located at the front end of the injection cylinder 30 is positioned further outward in the width direction X than the position of the nozzle touch rod 80. This makes it easier for the operator of the injection molding machine 1 to check the condition of the nozzle 31, allowing for maintenance such as checking for blockages and cleaning of the nozzle 31. Furthermore, when the injection device 10 is rotated, the entire injection cylinder 30 faces laterally in the width direction, allowing for maintenance such as cleaning and replacement of the injection cylinder 30 and screw 35.

[0091] <Effects of the Embodiment> The injection molding machine 1 according to the above embodiment has a pivot pin 25 to which the injection device 10 is pivotably connected to the base 15, and a housing 70 to which the injection device 10 is rotatably connected by connecting pins 74 arranged on the axis of the pivot pin 25. The housing 70 has a plurality of nozzle touch rods 80 connected to it at a position away from the fixed die 61. That is, the nozzle touch rods 80 are not directly connected to the injection device 10 but are connected to the housing 70, and the injection device 10 is rotatably connected to the housing 70 around the connecting pins 74 arranged on the axis of the pivot pin 25. As a result, when rotating the injection device 10 relative to the base 15, the nozzle touch rods 80 can be rotated relative to the housing 70 without having to attach or detach them, thus allowing the injection device 10 to be rotated while the nozzle touch rods 80 are attached. As a result, the injection device 10 can be rotated without the hassle of attaching or detaching the nozzle touch rods 80.

[0092] Furthermore, multiple pulleys 77 attached to nuts 82 that screw onto the threaded portions 81 of each nozzle touch rod 80 are rotated by the driving force from a drive motor 75 transmitted via a transmission belt 78. As the nuts 82 rotate together with the pulleys 77, the multiple nuts 82 rotate at the same rotational speed. As a result, the multiple nuts 82 that screw onto the threaded portions 81 of the multiple nozzle touch rods 80 move at the same speed in the extending direction of the nozzle touch rod 80, allowing the housing 70 that holds the nuts 82 to move in the longitudinal direction Y, and the injection device 10 to move 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 or backward.

[0093] Furthermore, the nozzle touch rod 80 is biased from the side where the injection device 10 is located to the side where the fixed die 61 is located by a spring member 68 of the rod connecting portion 65 that connects the nozzle touch rod 80 to the fixed die 61. 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 resin material when injecting resin material from the injection device 10 into the mold 63 can be more reliably suppressed.

[0094] Furthermore, since the multiple nozzle touch rods 80 are positioned both above and below the injection cylinder 30, the injection device 10 can be rotated around the pivot pin 25 without the injection cylinder 30 coming into contact with the nozzle touch rods 80. As a result, the injection device 10 can be rotated more reliably without the hassle of attaching and detaching the nozzle touch rods 80.

[0095] Furthermore, the three nozzle touch rods 80 are arranged at equal intervals along a line of a virtual circle vc centered at the center P of the nozzle 31 when viewed in the longitudinal direction Y. Therefore, when the injection device 10 is moved forward or backward, even when the force acting on the nozzle touch rods 80 in the extending direction 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. As a result, the fixed die 61 can be prevented from collapsing due to an unbalanced force acting in the longitudinal direction Y, and the fixed mold 63f and the movable mold 63m can be prevented from being slightly misaligned when combined during the mold closing process. As a result, the fixed mold 63f and the movable mold 63m can be combined with high precision, and molded products can be formed with high precision.

[0096] [Differentiation] 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 position of the nozzle touch rods 80 do not matter as long as they are positioned so that the force acting from the nozzle touch rods 80 to the fixed die 61 is equal when the injection device 10 is moved in the longitudinal direction Y by rotating the nut 82 that is screwed onto the threaded portion 81, and so that 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, a nut 82 is screwed onto the threaded portion 81 of the nozzle touch rod 80, and the driving force generated by the drive 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, there are other configurations for moving the injection device 10 in the longitudinal direction Y. For example, a drive motor may be provided for each nozzle touch rod 80, and the nuts 82 that are screwed onto the threaded portion 81 of each nozzle touch rod 80 may be rotated by individual drive motors. By coordinating the timing of the drives of multiple drive motors, multiple nuts 82 may be rotated synchronously. Any configuration is acceptable as long as the injection device 10 can be moved in the longitudinal direction Y by moving the housing 70 relative to the nozzle touch rod 80 in the longitudinal direction Y.

[0098] Furthermore, in the above-described embodiment, one cycle of injection molding operation in the injection molding machine 1 includes a nozzle advance step and a nozzle retraction step. However, when performing injection molding operation in the injection molding machine 1, it is not necessary to move the injection device 10 in the longitudinal direction Y in every cycle. Once the injection device 10 is moved to the front in the longitudinal direction Y to bring the nozzle 31 into contact with the fixed mold 63f, the injection molding operation cycle may be performed multiple times while the nozzle 31 remains 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...Legs, 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 body, 42...Stay, 43...Drive motor, 44...Transmission belt, 45...Pulley, 50...Forward / reverse mechanism, 51...Drive motor, 52...Transmission belt, 53...Pulley, 54...Ball screw mechanism, 55...Screw part, 56...Nut section, 58...Load cell, 60...Clamping device, 61...Fixed die, 62...Moving die, 63...Mold, 63f...Fixed mold, 63fp...Through-hole, 63m...Moving mold, 65...Rod connection section, 66...Case section, 67...Base section, 68...Spring member, 70...Housing, 71...Through hole, 72...Rod support section, 73...Connecting pin support section, 74...Connecting pin, 75...Drive motor, 76...Pulley, 77...Pulley, 78...Transmission belt, 79...Idler, 80...Nozzle touch rod, 81...Threaded section, 82...Nut, 83...Bush, 85...Rod flange section

Claims

1. An injection device that melts a resin material in an injection cylinder in which a screw is positioned inside, and injects the molten resin material from a nozzle, A pivot pin is provided to connect the injection device to the base on which the injection device is mounted, so as to allow the injection device to rotate. A fixed die to which a mold for molding the resin material injected from the nozzle is attached, A plurality of nozzle touch rods are arranged parallel to the extending direction of the injection cylinder in the state in which the resin material is injected from the nozzle into the mold, and one end of each is connected to the surface of the fixed die on the injection device side. A housing is provided, which is positioned spaced apart from the fixed die and to which a 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 connecting pin positioned on the axis of the pivot pin, Equipped with, An injection molding machine characterized in that the multiple nozzle touch rods are arranged at positions above and below the injection cylinder.

2. Each of the multiple nozzle touch rods has a threaded portion formed on it, Multiple nuts are screwed onto the threaded portion of the nozzle touch rod and are rotatably supported by the housing, and move in the axial direction of the nozzle touch rod together with the housing by rotating relative to the threaded portion, A plurality of pulleys are attached to each of the plurality of nuts so as to be rotatable together with the nut, A drive motor mounted on the housing, A transmission belt is wrapped around a plurality of the aforementioned pulleys and rotates the pulleys by transmitting driving force from the drive motor to each of the aforementioned pulleys, The injection molding machine according to claim 1, comprising:

3. The nozzle touch rod is connected to the fixed die so as to be movable relative to the nozzle touch rod in the extending direction, The injection molding machine according to claim 1 or 2, wherein the rod connecting portion has a biasing member that applies a biasing force to the nozzle touch rod from the side where the injection device is located to the side where the fixed die is located in the extending direction of the nozzle touch rod.

Images