WO2007034549A1

WO2007034549A1 - Reduction gear mechanism and injection molding device using the same

Info

Publication number: WO2007034549A1
Application number: PCT/JP2005/017465
Authority: WO
Inventors: Hiroshi Takeuchi; Mitsutoshi Kato
Original assignee: Shinko Sellbic Co., Ltd.
Priority date: 2005-09-22
Filing date: 2005-09-22
Publication date: 2007-03-29
Also published as: JPWO2007034549A1

Abstract

A reduction gear mechanism including a plasticized part (10) in which the rotating motion of a scroll motor is converted into an eccentric rotating motion by a first crank and an eccentric rotating power in transmitted to a first eccentric motion gear (124). The reduction gear mechanism comprises a first restricting pin (130) fixed, at one end, to the first eccentric motion gear (124) and loosely fitted, at the other end, to a plasticized housing (101). The loosely fitted portion of the plasticized part is moved so as to restrict the self-rotation of the first eccentric motion gear (124) and allow the eccentric rotating motion so that the first eccentric motion gear (124) can be eccentrically moved. Further, the reduction gear mechanism comprises a first self-rotating gear (110) partially engaged with the teeth of the first eccentric motion gear (124) in the eccentric direction and self-rotated by receiving a rotating power from the first eccentric motion gear (124) when the partially engaged position thereof is rotated according to the change of the eccentric direction of the first eccentric moving gear (124). The first self-rotating gear (110) is formed integrally with a scroll (106). As a result, the reduction gear mechanism capable of minimizing a power transmission loss can be formed at low cost and by a simple structure.

Description

Deceleration mechanism and injection molding apparatus using the same

Technical field

The present invention relates to a speed reduction mechanism that amplifies rotational power by transmitting the rotational speed of power output from a power generation source and transmits it to a driven body, and an injection molding apparatus using the speed reduction mechanism.

Background art

[0002] An injection molding apparatus includes a mold clamping unit that clamps a mold so that the cavity in the mold becomes a closed space, an injection unit that injects plasticized material into the cavity, and a plastic that plasticizes the material. As a basic structure. In this clamping part, it is necessary to clamp the mold at a high pressure, and it is necessary to inject the plasticized material at a high pressure in the injection part. Further, in the plastic part, even if the material is plasticized, the viscosity is very high, so it is necessary to pump at a high pressure. In order to generate such a large amount of power, a method of driving by decelerating the output of a large motor with a reduction mechanism has been conventionally used.

[0003] However, in such an injection molding apparatus, the enlargement of each element increases the size of the injection molding apparatus, requiring a large installation space and increasing the amount of material remaining in the apparatus, resulting in a lot of waste. The problem that occurred was pointed out.

[0004] In view of this, the present inventor has proposed an innovatively miniaturized injection molding apparatus by miniaturizing each element and by miniaturizing the motor and the speed reduction mechanism as the power source ( (See Patent Document 1).

For example, a motor as a power source employs a servo motor or a step restricting bing motor, and a speed reduction mechanism also includes a worm gear and a worm wheel. Servo motors, etc. are much smaller in size than conventional induction motors and can be electrically controlled with high accuracy, enabling miniaturization of the power system and control system, and miniaturization of injection molding equipment. The reduction mechanism consisting of a worm gear and a worm wheel contributes to downsizing by providing a large reduction ratio with a small number of parts.

Patent Document 1: Japanese Patent Application No. 2005-85249 Disclosure of the invention

Problems to be solved by the invention

[0006] However, the speed reduction mechanism including the worm gear and the worm wheel transmits power while the teeth of the worm gear and the teeth of the worm wheel slide, so there is a power transmission loss due to this sliding, and there is a margin in motor capacity. Otherwise, the desired power cannot be obtained, and there is a problem that tooth wear due to sliding increases and maintenance frequency increases.

[0007] Needless to say, a force capable of suppressing the occurrence of such a problem by using a gear set with a large motor capacity and having teeth treated with titanium coating or the like. This is in a direction opposite to the direction of downsizing and increases the cost of the injection molding equipment.

[0008] Therefore, an object of the present invention is to provide a speed reduction mechanism that can reduce power transmission loss to the limit with an inexpensive and simple configuration, and an injection molding apparatus using the same.

Means for solving the problem

[0009] In order to solve the above-mentioned problem, the speed reduction mechanism according to claim 1 is a speed reduction mechanism that amplifies the rotational power by decelerating the rotational speed of the power output from the power generation source force and transmits it to the driven body. A crank that converts the rotational power of the power generation source force to eccentric rotational power, an eccentric motion gear that transmits the eccentric rotational power from the crank, and a loose fitting hole is formed in the eccentric motion gear. Thus, one end is loosely fitted in the loose fitting hole and the other end is fixed to the fixed member fixed in position, or a loose fitting hole is formed in the fixed member fixed in position, and one end is in the loose fitting hole. A pin that is loosely fitted and the other end is fixed to the eccentric gear, and the rotation of the eccentric gear is restricted while allowing the eccentric gear to move in the range where the pin moves within the loose hole. A regulating pin that is integrally formed with the driven body and an eccentric gear It is arranged on the center side or arranged so as to include the eccentric movement gear inside, and partially meshes with a tooth portion in the eccentric direction of the eccentric movement gear, and the eccentric movement gear is eccentric. It consists of a rotating gear that rotates by receiving rotational power by rotating a partial meshing position according to a change in direction.

[0010] In the speed reduction mechanism according to claim 2, the driven body is a ball screw, and the ball screw A ball screw shaft or a ball screw nut and a self-rotating gear are formed.

[0011] In addition, the injection molding apparatus according to claim 3 is an injection molding apparatus including a plastic rib portion including a scroll driving mechanism that drives a scroll when the material is plasticized and pressure-fed by the scroll. The scroll drive mechanism is equipped with a speed reduction mechanism, and the driven body is a scroll that feeds the material in the spiral groove that shrinks toward the rotation center axis toward the rotation center axis, and is fixed. The member is a plasticized housing in which the casing forms a casing of the plastic collar.

[0012] In addition, the injection molding apparatus according to claim 4 drives the plunger when the plasticized material in the injection cylinder is injected into the cavity of the extrusion mold by the plunger that forms the piston of the injection cylinder. An injection molding apparatus having an injection part having a plunger drive mechanism, wherein the plunger drive mechanism has a speed reduction mechanism, and the driven body is engaged with a ball screw shaft whose tip part forms a plunger, and An injection side engagement member that allows the ball screw shaft to freely move back and forth while restricting free rotation of the ball screw shaft, the injection side engagement member and the rotating gear wheel are formed in a body, and a fixing member serves as a casing of the injection unit. An injection housing made.

[0013] Further, the injection molding apparatus according to claim 5 drives the plunger when the plasticized material in the injection cylinder is injected onto the cavity of the extrusion mold by the plunger that forms the piston of the injection cylinder. An injection molding apparatus having an injection part having a plunger drive mechanism, wherein the plunger drive mechanism has a speed reduction mechanism, and the driven body is a ball screw nut screwed into a ball screw shaft whose tip part forms a plunger. The ball screw nut and the rotating gear are formed in a body, and the fixing member serves as an injection housing that forms a casing of the injection portion.

[0014] Further, the injection molding apparatus according to claim 6, when driving the movable mold of the mold composed of a fixed mold and a movable mold movable relative to the fixed mold, and clamping the mold, An injection molding apparatus having a mold clamping unit having a mold clamping drive mechanism for opening and closing the mold, wherein the mold clamping drive mechanism has a speed reduction mechanism, and the tip of the driven body is movable at that time A mold clamping side engaging body that engages with a ball screw shaft connected to a mold and rotates the ball screw shaft. The mold clamping side engaging body and a rotating gear are formed in a body, and a fixing member is a mold. Form the casing of the fastening part This is a mold clamping housing.

The invention's effect

[0015] A reduction mechanism according to the present invention is a reduction mechanism that amplifies rotational power by decelerating the rotational speed of power output from a power generation source, and transmits the amplified rotational power to a driven body. A crank that converts the rotational power of the force into eccentric rotational power, an eccentric motion gear that transmits the crank force eccentric rotational power, and a loose-fitting hole is formed in the eccentric motion gear, and one end thereof The loose fitting hole is loosely fitted to the fixing member whose other end is fixed, or a loose fitting hole is formed in the fixing member whose position is fixed, and one end is loosely fitted to the loose fitting hole and the other end. Is a pin fixed to the eccentric gear, and a regulation pin for restricting the rotation of the eccentric gear while allowing the eccentric gear to move in the range in which the pin moves in the loose fitting hole, Formed integrally with the driven body and disposed on the center side of the eccentric gear, An eccentric gear is disposed on the inner side, and partially meshed with a tooth portion in the eccentric direction of the eccentric gear, and a portion corresponding to a change in the eccentric direction of the eccentric gear. Because it consists of a rotating gear that rotates by receiving rotational power by rotating the meshing position, it is possible to reduce power transmission loss to the limit with an inexpensive and simple configuration, and various devices using this As a result, it becomes possible to reduce the size and cost of the product, and to improve the reliability.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of an injection molding apparatus according to the present invention.

FIG. 2 is a cross-sectional perspective exploded view of a plastic collar.

FIG. 3 is a diagram showing a configuration of scrolling.

FIG. 4 is a diagram applied to explain the operation of the speed reduction mechanism.

FIG. 5 is an exploded cross-sectional perspective view illustrating a check valve mechanism.

FIG. 6 is a diagram applied to explain the operation of the check valve mechanism.

FIG. 7 is an exploded cross-sectional perspective view of an injection part.

FIG. 8 is a sectional perspective exploded view of a mold clamping part.

FIG. 9 is a view when a ball screw nut and an eccentric movement gear of a speed reduction mechanism in an injection part are formed integrally. FIG. 10 is a view when the ball screw nut of the speed reduction mechanism and the eccentric motion gear are integrally formed in the mold clamping part.

FIG. 11 is a view showing an example in which the regulation pin is loosely fitted or fitted to a driven body without being loosely fitted or fitted to a fixing member such as a plasticized housing.

[12] FIG. 12 is a diagram showing an example of using a plurality of eccentric gears.

FIG. 13 is a diagram showing a tooth inclusion relationship in an eccentric gear and a rotation gear and the like. Explanation of symbols

A to I bearings; 10 plasticized parts; 20 injection parts

30 Mold clamping part; 40 Cassette mold; 101 Plasticized housing

102 Fixed die plate; 104 barrel; 105 spiral groove

106 Scroll; 107 Scroll drive mechanism; 108 Check valve mechanism 109 Scroll shaft hole; 110 First rotating gear; 111 Scroll surface

112 Scroll side; 113 Feed groove; 114 Insert groove

120 Scroll motor; 121 Check valve; 123 First restriction pin fixing hole

124 (124a-124c) 1st eccentric gear; 125 (129a-125c) 1st crank

126 Motor shaft; 128 Tube part; 129 Crank part

130 1st restriction pin; 131 head; 132 flange

133 (133 & ~ 133c) 1st loose-fitting hole; 135 Nore receiving member

136 One-way clutch; 137 Clutch fitting; 139 Valve pocket

140 Open / close end; 141 Engagement part; 142 Anti-rotation part

144 Rotation stop hole 145 Clutch fitting part 146 Taper part

147 engaged portion; 150 taper fitting portion; 151 receiving member fitting portion

152, 153 Stepped portion; 201 Injection cylinder; 202 Plunger

203 Plunger drive mechanism; 204 Runner tube; 206 Injection motor

207 Second pulley; 208 Second eccentric gear; 209 Second rotation gear

210 Second ball screw shaft; 211 Injection housing; 213 Second ball screw shaft

214 Second ball screw nut 215 Through hole 216 Second crank

217 Head; 219 Second ball screw shaft through hole; 220 Nut engaging part 222 Second loose-fitting hole; 223 Second restricting pin fixing hole; 225 Second ball screw shaft engaging part

230 2nd restriction pin; 301 mold clamping housing; 302 movable die plate 303 mold clamping drive mechanism; 304 diver; 311 3rd ball screw shaft

312 Clamping motor 313 Female thread 314 Third pulley

315 Third restriction pin 316 Cylindrical hole 317 Third rotation gear

318 storage unit; 319 engagement hole; 320 bolt hole

321 Third pin fixing hole; 322 Third eccentric gear; 323 Fixing bolt

324 through hole; 325 3rd loose hole; 326 head

327 3rd crank; 328 3rd ball screw nut

401 Movable mold; 402 Fixed mold; 403 Positioning pin

404 Restriction pin receiving hole

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described with reference to the drawings. In this embodiment, the case where the thermoplastic resin is injection molded will be described as an example. However, the present invention can be applied to the case where the thermosetting resin, wax, and binder-treated ceramic 'iron powder is injection molded. I will add in advance.

[0019] Further, as will be described later, the speed reduction mechanism according to the present invention includes a crank that converts rotational power from a power generation source into eccentric rotational power, and an eccentric operation that transmits the eccentric rotational power from the crank. A loose fitting hole is formed in the moving gear and the eccentric gear, and one end is loosely fitted in the loose fitting hole, and the other end is fixed to a fixed member fixed in position, or the fixed member fixed in position. A loose fitting hole is formed, one end of which is loosely fitted in the loose fitting hole and the other end is fixed to the eccentric movement gear, and the eccentric movement gear is displaced within the range in which the pin moves within the loose fitting hole. A regulation pin that regulates the rotation of the eccentric gear while allowing the core motion and a driven pin and is formed integrally with the driven body, and is disposed on the center side of the eccentric gear, or includes the eccentric gear. The tooth portion in the eccentric direction and the partial meshing in the eccentric gear are arranged so as to be included on the side. Rutotomoni, a rotation gear that rotates the rotational power Te receiving by partial meshing position in response to changes in the direction of eccentricity of the eccentric motion gear rotates as main components, Ru.

[0020] And in the injection molding apparatus, a scroll drive mechanism, a plunger drive mechanism, a mold clamping The speed reducer mechanism is used for the drive mechanism. At this time, the same members (crank, regulating pin, eccentric gear, rotating gear, etc.) in the scroll driving mechanism, plunger driving mechanism, and mold clamping driving mechanism are distinguished as first to third, respectively. For example, a crank in the scroll drive mechanism is described as a first crank, a crank in the plunger drive mechanism is described as a second crank, and a crank in the mold clamping drive mechanism is described as a third crank. The power generation source is compatible with scroll motors, injection motors, and mold clamping motors.

[0021] The application of the speed reduction mechanism according to the present invention is not limited to the injection molding apparatus. It is a requirement that the free gear is formed integrally with the driven body, and the speed reduction drive system and electric equipment of the automobile. It is added that it can be applied to general deceleration equipment such as the deceleration drive system.

FIG. 1 is a cross-sectional view of such an injection molding apparatus. The injection molding apparatus includes a movable mold 401 and a fixed mold 402, and a space in which plasticized material is injected onto these abutting surfaces. Mold 40 in which a certain K is formed, plasticizing the material 10 by heating and plasticizing the material and feeding the material to the injection cylinder 201 while kneading the material, plasticizing in the injection cylinder 201 The main components are an injection part 20 for injecting material into the cavity K and a mold clamping part 30 for opening and closing the mold 40.

[0023] FIG. 2 is an exploded perspective view showing the main part of the plastic cage 10, which has a plastic cage housing 101 and a fixed die plate 102, and a material such as pellets is put into the plasticized housing 101. A material insertion hole 103 is formed.

[0024] These plasticized housing 101 and the stationary die plate 102, the barrel 104 to heat the material charging hole 103 or et charged materials, the barrel ₁₀ 4 with spiral grooves 105 for conveying the material is formed equivalents Rotating while contacting, conveying, stirring, plasticizing, and kneading the material in the spiral groove 105. After plasticizing, the scroll 106 is fed in the direction of the rotation center axis with the Weisenberg effect, and the scroll 106 is rotated. A scroll drive mechanism 107 for driving and a check valve mechanism 108 for controlling injection and backflow of plasticized material are provided.

As shown in FIG. 3, the scroll 106 is a rotating body having a substantially short cylindrical shape, and a spiral groove 105 is formed on the side of the rotating body that contacts the fixed die plate 102 from the side surface. This screw The swirl groove 105 is formed in a plurality of strips (in the case of one strip in FIG. 2) so that the scroll shaft hole 109 formed in the rotation shaft is reduced in accordance with the rotation direction of the scroll 106, and the back surface thereof is a recess 116. The first rotation gear 110 is formed on the inner side surface of the recess 116. A check valve 121 is attached to the scroll shaft hole 109.

Hereinafter, the surface where the scroll 106 is in contact with the fixed die plate 102 is referred to as a scroll action surface 111, and the side surface is referred to as a scroll side surface 112. Further, the spiral groove 105 formed on the scroll action surface 111 is referred to as a feeding groove 113, and the spiral groove 105 formed on the scroll side surface 112 is referred to as an insertion groove 114. Accordingly, the spiral groove 105 is constituted by the nipping groove 114 and the feeding groove 113.

In addition, the scroll working surface 111 is formed so as to have a concave pyramid shape close to a plane having an apex angle Θ of Θ = 176 to 174 degrees to generate a direct pressure (N), thereby enabling the material to be pumped. Yes. Of course, it is good also as the convex cone shape of the same angle.

[0027] The barrel 104 has a plurality of heaters (not shown) for heating the material inside, and the surface on the scroll 106 side is formed in close contact with the scroll action surface 111, and the central axis is plastic. A flow path 115 is formed to form a flow path for the formed material.

The plastic housing 101, the fixed die plate 102, and the various members contained in the plastic housing 101 and the fixed die plate 102 formed by the heat of the barrel 104 are formed to form a cooling water channel 117 that forms a cooling water channel. In addition, a heat insulating material 118 is appropriately provided.

The scroll 106 is rotatably disposed in the plasticizing housing 101 via a bearing A, and is provided with a scroll driving mechanism 107 that decelerates the rotation speed of the scroll motor 120 and transmits it to the scroll 106. And

[0029] The scroll drive mechanism 107 has an annular first formed with teeth that mesh with the first rotation gear 110 on the outer peripheral surface and a plurality of first restriction pin fixing holes 123 inserted in the thickness direction. An eccentric motion gear 124, a first restriction pin 130 that is inserted into the first restriction pin fixing hole 123, and a sleeve-shaped first crank 125 that transmits rotational power to the first eccentric motion gear 124 are provided. The motor shaft 126 of the scroll motor 120 is attached to the link 125.

[0030] The first crank 125 is composed of a cylindrical portion 128 into which the motor shaft 126 is inserted, and a crank portion 129 eccentric to the cylindrical portion 128. The crank portion 129 is a bearing C. Through The first eccentric movement gear 124 is inserted, and the bearing B is inserted into the cylindrical portion 128 so as to be attached to the plastic housing 101.

The plasticized housing 101 is fixed to the fixed die plate 102, and the flange 132 is screwed to the plasticized housing 101.

The flange 132 is provided with a first loose-fitting hole 133 in which the head 131 of the first restriction pin 130 is loosely fitted and the movement of the first eccentric movement gear 124 is restricted.

With such a configuration, the rotational motion of the motor shaft 126 is transmitted to the first crank 125, the crank portion 129 performs eccentric rotational motion, and this eccentric rotational motion is It is transmitted to the core movement gear 124.

FIG. 4 is a schematic diagram for explaining such a speed reduction mechanism. When the first eccentric movement gear 124 is eccentric by the first crank 125, the first eccentric movement gear 124 in the eccentric direction of the first eccentric movement gear 124 is shown. The tooth portion and the tooth portion of the first rotating gear 110 are partially engaged, and the teeth of the other portions are disengaged.

[0034] When the eccentric direction rotates in such a state, the head of the first regulating pin 130 moves along the inner peripheral surface of the first loose-fitting hole 133, and the first eccentric movement gear 124 and the first 1 The part that meshes with the rotating gear 110 rotates accordingly. Since the rotation of the first eccentric movement gear 124 is restricted by the first restriction pin 130, the change in the meshing position is allowed by the rotation of the first rotation gear 110, and the rotational power of the scroll motor 120 is The first rotation gear 110 is transmitted to the first rotation gear 110 at a reduction ratio determined by the first rotation gear 110 and the first eccentric moving gear 124.

[0035] In the speed reduction mechanism including the first rotation gear 110, the first eccentric movement gear 124, and the first restriction pin 130 that restricts the movement of the first eccentric movement gear 124, the teeth of the first rotation gear 110 and the first rotation gear 1 Eccentric motion gear 124 teeth are both parallel teeth, and there is almost no sliding between the teeth as in the worm gear and worm wheel, reducing tooth wear loss and accompanying sliding. Power loss can be greatly suppressed.

In addition, since the movable part is configured to be in contact with other members via the bearings A to C, the power transmission loss in the movable part can be greatly reduced.

[0036] The check valve mechanism 108 controls whether or not the plasticized material is sent from the scroll 106 to the injection unit 20, and the material injected toward the cavity K by the injection unit 20 is plastic. It functions to prevent backflow to the buttock 10, as shown in Fig. 5. , Check valve 121, valve screw 135, one-way clutch 136, valve screw storage portion 151, and the like.

[0037] The end of the check valve 121 on the barrel 104 side is in contact with a conical valve pocket 139 that is an opening of the flow path 115 that forms a flow path of the material that flows through the barrel 104. The opening / closing end 140 is formed to close the valve pocket 139, and the other end of the check valve 121 is formed with a threaded screw 141, and an intermediate portion thereof is provided with a rotation stopper 142. Is formed. The boundary between the rotation stop portion 142 and the screw portion 141 is a contact portion 152 that forms a step.

[0038] The rotation stopper 142 is formed by cutting the check valve 121 into, for example, a D shape, and a hole (rotation stopper) 144 having the same shape as the sectional shape of the rotation stopper 142 is formed in the scroll shaft hole 109. Has been. Then, the rotation stop portion 142 of the check valve 121 is inserted into the rotation stop hole 144, so that the free rotation of the check valve 121 is restricted, and the check valve 121 can advance and retreat in the axial direction.

[0039] The knob screw 135 is composed of a clutch fitting tube portion 145 into which the one-way clutch 136 is inserted, and a tapered portion 146 formed so that the vicinity of one end is reduced toward the motor shaft 126. A female screw portion 147 is formed in which the screw portion 141 of the check valve 121 is screwed.

[0040] On the other hand, the motor shaft 126 is formed with a valve housing portion 151 that acts as a clutch housing hole 137 in which the one-way clutch 136 is housed and a tapered portion housing hole 150 in which the tapered portion 146 is housed.

[0041] Then, as shown in FIG. 6 (a), the motor shaft 126 rotates in a predetermined direction (a direction in which the plasticized material is injected). In this state, the taper portion 146 of the valve screw 135 is press-fitted into the taper portion receiving hole 150 of the valve screw storage portion 151, and the two-way clutch 136 is in a free state. The valve screw 135 is rotated by friction between the part storage hole 150 and the taper part 146 of the valve screw 135, and the check valve 121 moves to the motor shaft 126 side by screwing of the screw part 141 and the female screw part 147.

[0042] As a result, the open / close end 140 of the check valve 121 is separated from the valve pocket 139, the valve pocket 139 is opened, and the material is injected through the flow path 115 as shown in FIG. It is sent into the exit cylinder 201. In FIG. 6, a solid line arrow L1 indicates the direction in which the check valve moves, and a solid line arrow L2 indicates the direction in which the plunger 202 moves. The dotted arrow L3 indicates the material flow!

[0043] When the contact portion 152 of the check valve 121 comes into contact with the contact portion 153 of the scroll shaft hole 109, the movement of the check valve 121 is regulated by this contact, and the valve screw 135 is pulled to the check valve 121. Accordingly, as shown in the enlarged view of FIG. 6B, a minute gap δ is generated between the taper portion 146 and the taper portion accommodation hole 150, and the press-fitted state is released. Note that this gap is a gap that allows the tapered portion 146 and the tapered portion accommodation hole 150 to idle.

[0044] When the taper portion 146 and the taper portion receiving hole 150 are idle, the rotational driving force to the check valve 121 is not transmitted, so that the scroll 106 can continue to rotate and continue to eject material. become.

[0045] When a predetermined amount of material is fed into the injection cylinder 201, the scroll motor 120 is reversely rotated as shown in FIG. 6 (c). Since this rotation direction is a direction in which the one-way clutch 136 functions as a clutch state, the rotation of the motor shaft 126 is transmitted to the valve screw 135 via the one-way clutch 136, and the check valve 121 moves toward the valve pocket 139 and opens and closes 140 contacts the valve pocket 139 to close the opening.

[0046] When the open / close end 140 comes into contact with the valve pocket 139, the check valve 121 cannot move any further, so the valve screw 135 moves to the motor shaft 126 side, and the tapered portion 146 is pushed into the tapered portion receiving hole 150. The press-fitted state shown in Fig. 6 (d) returns to the state shown in Fig. 6 (a).

[0047] In a state where the valve pocket 139 is closed, even if the plunger 202 injects the material in the injection cylinder 201, the material does not flow back to the scroll 106 side due to the injection pressure.

[0048] As described above, since the check valve 121 can be reliably operated with a simple configuration using inexpensive parts, the reliability is improved, and the check valve 121 moves inside the scroll shaft hole 109 with the piston. When the injection molding apparatus is started up, the problem that the check valve 121 moves poorly due to the material entering the gap during the previous operation is solved.

[0049] The drive source of the check valve 121 is a scroll module that drives the scroll 106. Therefore, it is possible to reduce the cost of the injection molding apparatus by reducing the number of parts and the number of parts by combining the power source.

As shown in detail in FIG. 7, the injection unit 20 includes the above-described injection cylinder 201 and the injection cylinder.

Plunger 202 mounted on 201, plunger drive mechanism 2 for driving the plunger 202

03. A runner tube 204 or the like provided in the fixed die plate 102 for injecting the material from the injection cylinder 201 into the cavity K is provided.

[0051] The plunger drive mechanism 203 has a second pulley 207, a second eccentric motion gear 208, a second rotation gear 209, and a second ball screw shaft 210 to which the power of the injection motor 206 is transmitted as main components.

The injection housing 211 is provided.

The tip of the second ball screw shaft 213 is a plunger 202 that forms the piston of the injection cylinder 201, and the rear end is formed with an asymmetric cross section (for example, D shape) with respect to the shaft center.

[0052] The second pulley 207 is sandwiched by a pair of bearings D and freely rotates, and a through hole 215 through which the head 217 of the second ball screw shaft 213 passes is formed. Further, the inner peripheral surface of the end of the second pulley 207 on the second ball screw shaft 213 side is formed as a cylindrical surface coaxial with the rotation shaft of the second pulley 207, and the outer peripheral surface is eccentric with respect to the rotation shaft. A second crank 216 having a cylindrical surface force is formed. The second crank 216 is provided with a bearing E.

[0053] The injection housing 211 is provided with a second ball screw shaft through hole 219 and a nut engaging portion 220, and a second loose-fitting hole 222 on the end surface of the injection motor 206 side (second pulley 207 side). There are several.

When the second ball screw nut 214 is mounted and stored in the nut engaging portion 220, the second ball screw nut 214 is fixed to the injection housing 211 with a screw (not shown).

[0054] The second eccentric gear 208 is an annular gear having teeth formed on the inner peripheral surface and a plurality of second restricting pin fixing holes 223 formed in the thickness direction. Mounted on 2 cranks 216.

[0055] The second rotation gear 209 has teeth formed on the outer peripheral surface and a second ball screw at the center. A second ball screw shaft engaging portion 225 is formed through which the head portion 217 of the shaft 213 is inserted and engaged, and a bearing F is externally inserted on the outer peripheral portion of the second ball screw shaft engaging portion 225 to provide a second eccentricity. It comes to be attached to the driving gear 208.

Then, when the second pulley 207 rotates, the second crank 216 performs an eccentric rotational motion, and the eccentric rotational motion is transmitted to the second eccentric motion gear 208. A second regulating pin 230 is fixed to the second eccentric movement gear 208, and its head is loosely fitted in a second loose-fitting hole 222 provided in the injection housing 211. The gear 208 eccentrically moves in the range in which the head of the second restriction pin 230 can move in the second loose-fitting hole 222, so that the rotation movement is restricted and the second rotation gear 209 is partially meshed. As the portion rotates, the second rotation gear 209 rotates.

When the second rotation gear 209 rotates, the rotation is transmitted to the second ball screw shaft 213 by the engagement between the second ball screw shaft engaging portion 225 and the head 217 of the second ball screw shaft 213, and 2 When the rotating gear 209 rotates in a certain direction, the plunger 202 moves so as to be pulled out from the injection cylinder 201 and the inside of the injection cylinder 201 becomes empty. When the rotation in the reverse direction, the cylinder contents (material) of the injection cylinder 201 are It will be extruded.

As shown in detail in FIG. 8, the mold clamping unit 30 includes a mold clamping housing 301, a movable die plate 302, and a mold clamping drive mechanism 303. The mold clamping nosing 301 is fixed by a plurality of divers 304. The die plate 102 is fixed at a predetermined interval, and the movable die plate 302 is inserted into the diver 304 so that the die clamping drive mechanism 303 can advance and retreat.

The mold clamping drive mechanism 303 includes a third ball screw shaft 311, a mold clamping motor 312, a third pulley 314, a third restriction pin 315, a third eccentric motion gear 322, a third rotation gear 317, and the like. . The third pulley 314 side end of the third ball screw shaft 311 is a head 326 having a cross section that is asymmetric (eg, D-shaped) with respect to the shaft center, and a female screw 313 is formed at the center thereof. Yes.

[0060] The third pulley 314 is sandwiched between a pair of bearings I and rotated by the rotational power of the mold clamping motor 312. A third crank 327 is provided at the tip of the third pulley 314. One end of the third crank 327 is formed with a cylindrical hole 316 coaxial with the rotation shaft of the third pulley 314. The outer peripheral surface of the third crank 327 has a cylindrical shape with a circumferential surface force eccentric to the rotation shaft. H is extrapolated. The cylindrical hole 316 is a hole for accommodating the head of the fixing bolt 323. Then, the third crank 327 is stored in the storage portion 318 provided in the mold clamping housing 301 via the bearing I. In this mold-clamping housing 301, a through hole 324 through which the head 326 of the third ball screw shaft 311 passes, and a head of the third restriction pin 315 are loosely fitted on the surface on the third ball screw shaft 311 side. A plurality of third loose fitting holes 325 are provided.

[0062] The third eccentric gear 322 is an annular member in which teeth are formed on the outer peripheral surface and a plurality of third restricting pin fixing holes 321 are formed in the thickness direction. The third crank 327 is inserted.

[0063] In the third rotation gear 317, teeth are formed on the inner peripheral surface of a member protruding from the surface on the third eccentric movement gear 322 side, and the head of the third ball screw shaft 311 is formed on the other surface. A mating hole 319 is provided to be inserted and engaged.

A bolt hole 320 through which the fixing bolt 323 passes is formed at the center of the third rotating gear 317. The head 326 of the third ball screw shaft 311 is attached to the engaging hole 319, and the fixing bolt 323 The third rotation gear 317 and the third ball screw shaft 311 are connected to each other by tightening with the bolt.

[0064] Then, the rotational power of the mold clamping motor 312 is transmitted as the eccentric rotational motion of the third crank 327 via the third pulley 314. This eccentric rotational movement is transmitted to the third eccentric driving gear 322 via the bearing H, and the teeth and parts of the third rotating gear 317 are subjected to the movement restriction of the third restriction pin 315 by the third loose-fitting hole 325. Since the meshing position is rotated and the meshing position rotates in accordance with the eccentric direction, the third rotation gear 317 rotates, and accordingly, the third ball screw shaft 311 rotates.

[0065] The mold 40 is a cassette mold 40 composed of a movable mold 401 attached to the movable die plate 302 and a fixed mold 402 attached to the fixed die plate 102. A plurality of positioning pins 403 are provided, and a regulation pin receiving hole 404 into which the positioning pins 403 are fitted is provided in the opposing mold 40.

Further, a runner receiving hole 406 into which a hot runner 405 is inserted is formed in the fixed mold 402 attached to the fixed die plate 102.

In addition, the movable mold 401 is provided with a molded product extrusion mechanism 407. This molded product push-out mechanism 407 is fixed to a support plate 409 to which a plurality of extrusion pins 408 provided so as to pass through the movable die 401 and to be inserted into the cavity K, and is fixed to the support plate 409 and movable. Money A support bar 410 to be inserted into the mold 401, a panel 411 for urging the support plate 409 so that the head of the push pin 408 is inserted into the support bar 410, and the head of the cavity K normally forms a wall surface of the cavity K; A fixed extrusion plate 412 and a thrust bearing 413 attached to the extrusion plate 412 are provided.

[0067] Then, when the molded product extrusion mechanism 407 takes out the injection molded product, the third ball screw shaft 311 is thrust-bearing when the movable die plate 302 is retracted by a predetermined amount or more toward the mold clamping housing 301 side. Abutting on 413, the support plate 409 is pushed to the cavity K side against the panel 411. As a result, the injection-molded product in the cavity K can be easily extruded by the extrusion pin 408.

[0068] The thrust bearing 413 is provided so that the head of the third ball screw shaft 311 does not damage the extrusion plate 412, and may be a thrust slide bearing or the like.

[0069] Further, in the injection part 20 and the mold clamping part 30, the ball screw nut and the rotation gear are separate structures. However, the present invention is not limited to this. For example, as shown in FIGS. 9 and 10, the ball screw nut and the eccentric motion gear of the speed reduction mechanism in the injection part 20 and the mold clamping part 30 may be formed integrally.

FIG. 9 shows the case in the injection part 20, and FIG. 10 shows the case in the mold clamping part 30.

As a result, since the second member becomes the first member, the cost can be reduced and the device can be further downsized.

[0070] Further, the first restriction pin 130 to the third restriction pin 315 described so far are fixed to the first eccentric motion gear 1 24 to the third eccentric motion gear 322, and are provided in the plasticized housing 101 or the like. The first loose-fitting hole 133 to the third loose-fitting hole 325 are configured to be loosely fitted, but the reverse structure may be used. That is, the function of the first restricting pin 130 and the like is to restrict the position of the first eccentric movement gear 124 and the like with respect to the plastic housing 101 and the like which are fixed members. The first restriction pin fixing hole 123 is formed to fix the first restriction pin 130 etc., and the first eccentric fitting gear 124 etc. is formed with the first loose fitting hole 133 etc. to loosely fit the first restriction pin 130 etc. Even if it is done, it is possible to carry out similar regulations.

[0071] In addition, the regulation pin is not a force when it is loosely fitted or fitted to a fixing member such as a plasticized housing. As shown in FIG. 11, it may be configured to be loosely fitted or fitted to a driven body 330 that rotates with an eccentric gear.

In this case, the rotating gear described so far is fixed. The third regulating pin 315 whose meshing relationship between the gear (the fixed gear 331) and the third eccentric gear 322 does not change is loosely fitted or fitted to the driven body 330 fixed to the third ball screw shaft 311. Therefore, the rotational power is transmitted to the driven body 330 and the third ball screw shaft 311 rotates.

[0072] Further, a bearing may be provided in order to avoid friction caused by direct contact of the first restricting pins and the like that are loosely fitted into the loose fitting holes.

[0073] In the description so far, the eccentric gear and the rotation gear have a one-to-one relationship, and each has one configuration. It is also possible to have a configuration in which a plurality of are provided.

For example, as shown in FIG. 12, n first eccentric motion gears 124a to 124c, bearings Ba to Bc, and first cranks 129a to 129c are provided (FIG. 12 shows three cases each). . At this time, the first cranks 129 a to 129 c of 3 are shifted by an equal angle with respect to the rotation center of the motor shaft 126. Then, one end of the first restricting pin 130 is loosely fitted in the first loose-fitting holes 133a to 133c of the first eccentric movement gears 124a to 124c, and the other end is fixed to the flange 132.

[0075] With such a configuration, each of the first eccentric gears 124a to 124c is eccentric according to the phase of each of the first cranks 129a to 129c and partially meshes with the first rotation gear 110. In the first rotation gear 110, rotational power is transmitted simultaneously from each of the first eccentric gears 124a to 124c, the power transmission point is axisymmetric, and smooth rotational power can be transmitted. When the same power is transmitted to the first rotation gear 110, the powers of the first eccentric gears 124a to 124c and the first cranks 129a to 129c are divided, so that wear and the like can be suppressed.

[0076] Further, the present invention is not limited to the inclusion relationship between the eccentric gear and the rotation gear. For example, in FIG. 10, the third eccentric gear 322 is an internal tooth and the third rotation gear 317 is an external tooth, but as shown in FIG. 13, the third eccentric gear 322 is a third rotation gear with an external tooth. Similar effects can be obtained by using 317 as an internal tooth.

[0077] Furthermore, in the above description, the rotational force of the motor is supplied to the mold clamping unit 30 and the like via a pulley. A structure in which the crank is directly attached to the motor shaft may be used, such as a force plastic structure that transmits to the crank.

Claims

The scope of the claims

[1] A reduction mechanism that amplifies rotational power by decelerating the rotational speed of power output from a power generation source and transmits the amplified rotational power to a driven body,

A crank that converts the rotational power of the power generation source force into eccentric rotational power; an eccentric motion gear that transmits the eccentric rotational power from the crank;

A loose fitting hole is formed in the eccentric gear, and one end is loosely fitted in the loose fitting hole and the other end is fixed to a fixed member fixed in position, or a loose fixed hole is fixed in the fixed member fixed in position. The pin is formed so that one end is loosely fitted in the loose fitting hole and the other end is fixed to the eccentric movement gear, and the eccentric movement gear is displaced within the range in which the pin moves within the loose fitting hole. A regulation pin that regulates the rotation of the eccentric gear while allowing the core motion;

Eccentric direction in the eccentric motion gear formed integrally with the driven body and disposed on the center side of the eccentric motion gear or disposed to include the eccentric motion gear inside And a rotating gear that rotates by receiving rotational power by rotating the partial meshing position according to a change in the eccentric direction of the eccentric gear. A reduction mechanism.

2. The reduction mechanism according to claim 1, wherein the driven body is a ball screw, and the rotation gear is formed on a ball screw shaft or a ball screw nut of the ball screw.

[3] An injection molding apparatus including a plasticizing portion including a scroll driving mechanism that drives a scroll when the material is plasticized and fed by a scroll.

The scroll driving mechanism includes the speed reduction mechanism, and the driven body is a scroll for pressure-feeding the material in the spiral groove that shrinks toward the rotation center axis toward the rotation center axis. 2. The injection molding apparatus using a speed reduction mechanism according to claim 1, wherein the fixing member is a plasticizing housing that forms a casing of the plastic flange portion.

[4] Injection including an injection portion having a plunger driving mechanism for driving the plasticized material in the injection cylinder when the plastic material in the injection cylinder is injected into the cavity of the extrusion mold by the plunger forming the piston of the injection cylinder A molding device,

The plunger drive mechanism includes the speed reduction mechanism, and the driven body is at the tip The injection-side engagement member and the rotation gear are an injection-side engagement member that engages with the ball screw shaft that forms the plunger and restricts the free rotation of the ball screw shaft, and is capable of moving forward and backward in the axial direction. 3. The injection molding apparatus using a speed reduction mechanism according to claim 2, wherein the injection molding apparatus is formed in a body and the fixing member is an injection housing forming a casing of an injection portion.

[5] Injection including an injection portion having a plunger driving mechanism for driving the plasticized material in the injection cylinder when the plastic material in the injection cylinder is injected into the cavity of the extrusion mold by the plunger forming the piston of the injection cylinder A molding device,

The plunger drive mechanism includes the speed reduction mechanism, and the driven body is a ball screw nut whose front end is screwed to a ball screw shaft forming the plunger, and the ball screw nut and the rotation gear are formed in a body. 3. The injection molding apparatus using a speed reduction mechanism according to claim 2, wherein the fixing member is an injection housing that forms a casing of an injection portion.

[6] A mold clamping drive mechanism that opens and closes the mold when the movable mold of the fixed mold and the movable mold movable relative to the fixed mold is driven to clamp the mold. An injection molding apparatus provided with a mold clamping part,

The mold clamping drive mechanism includes the speed reduction mechanism, and at this time, the driven body engages with a ball screw shaft whose tip is connected to the movable mold to rotate the ball screw shaft. The speed reduction according to claim 1, wherein the mold clamping side engaging body and the rotation gear are formed in a body, and the fixing member is a mold clamping housing forming a casing of the mold clamping portion. Injection molding equipment using the mechanism.