CN111376439B - Injection molding machine and contact preventing cover for injection molding machine - Google Patents

Abstract

The invention provides a technology capable of improving the rigidity of a pressure plate and avoiding mutual interference between a contact prevention cover and other components. An injection molding machine according to the present invention includes: a platen mounted with a mold; a cylinder body for melting the molding material; a nozzle which is disposed at the front end of the cylinder and fills the mold with a molten molding material; a heater for heating the nozzle and the cylinder; and a contact prevention cover configured to restrict an approach of the heater from both sides in a horizontal direction orthogonal to a front-rear direction and an upper side in a vertical direction, wherein the nozzle is advanced and retreated between a contact position where the nozzle hole of the platen contacts the mold and a retreat position where the nozzle hole of the platen retreats, and the contact prevention cover includes a movable portion mounted to be displaceable with respect to a predetermined member, and the movable portion is displaced with respect to the predetermined member while the nozzle advances from the retreat position to the contact position.

Description

Injection molding machine and contact preventing cover for injection molding machine

Technical Field

The present application claims priority from japanese patent application No. 2018-248401, filed on day 28, 12/2018. The entire contents of this Japanese application are incorporated by reference into this specification.

The invention relates to an injection molding machine and an anti-contact cover for the injection molding machine.

Background

The injection molding machine described in patent document 1 includes a purge hood and a heating hood. The purge hood prevents molten resin injected from the nozzle from scattering. The nozzle is arranged at the front end part of the cylinder body. A heating device is arranged around the cylinder body. The heating mantle prevents contact with the heating device. In addition, not only the heating cover but also the purge cover prevents contact with the heating device. The heating cover and the purifying cover form a contact-proof cover.

Patent document 1: japanese laid-open patent publication No. 2015-13372

Fig. 1 is a view showing a contact preventing cover according to a conventional example. Fig. 1 (a) is a diagram showing a conventional example of a positional relationship between a nozzle and a contact preventing cover when the nozzle is at a retracted position. Fig. 1 (b) is a diagram showing a conventional example of the positional relationship between the nozzle and the contact preventing cover when the nozzle is positioned at the contact position. In the description of the contact preventing cover, the X-axis direction positive side is also referred to as the rear side, and the X-axis direction negative side is also referred to as the front side. The X-axis direction is the moving direction of the nozzle 320. The X-axis direction, the Y-axis direction, and the Z-axis direction are orthogonal to each other. The X-axis direction and the Y-axis direction are horizontal directions, and the Z-axis direction is a vertical direction.

The injection device 300 has: a cylinder 310 for melting the molding material; a nozzle 320 disposed at a front end of the cylinder 310 and filling the fixed mold 810 with a molten molding material; and a heater 313 for heating the nozzle 320 and the cylinder 310. The injection device 300 further includes a screw 330 disposed inside the cylinder 310 so as to be rotatable and movable forward and backward. The injection device 300 further includes a hopper 370 for supplying the molding material into the cylinder 310. The hopper 370 accumulates granular molding material therein, and feeds the accumulated molding material to the supply port 311 of the cylinder 310.

The injection device 300 advances and retreats with respect to the fixed platen 110A. The stationary platen 110A has a stationary mold 810 mounted thereon. The fixed platen 110A has a nozzle hole 111A. The nozzle 320 is inserted into and removed from the nozzle hole 111A. The nozzle 320 advances and retreats between a retreating position (see fig. 1 (a)) and a contact position (see fig. 1 (b)). The position of the nozzle 320 is any position between the contact position and the retreat position to restrict the approach of the contact prevention cover 500A to the heater 313.

The contact preventing cover 500A restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. It is possible to prevent a worker from inadvertently coming into contact with the high temperature heater 313. The contact preventing cover 500A includes, for example, a platen fixing cover 510A and a cylinder fixing cover 520A.

The front end of the nozzle 320 contacts the stationary mold 810. If the cylinder fixing cover 520A is also provided at the tip end portion of the nozzle 320, the cylinder fixing cover 520A and the fixed mold 810 interfere with each other, and therefore the cylinder fixing cover 520A is not provided at the tip end portion of the nozzle 320. The cylinder fixing cover 520A is disposed rearward of the front end of the nozzle 320. When the tip end portion of the nozzle 320 exits from the nozzle hole 111A, it is not covered by the cylinder fixing cover 520A and is therefore covered by the platen fixing cover 510A. The platen fixing cover 510A surrounds the front end portion of the nozzle 320 retreated to the retreated position.

The platen fixing cover 510A is fixed to the fixed platen 110A. The platen fixing cover 510A is disposed behind (on the X-axis direction positive side) the fixed platen 110A. The platen fixing cover 510A restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction).

The cylinder fixing cap 520A is fixed to the cylinder 310 and moves forward and backward together with the cylinder 310 and the nozzle 320. When the nozzle 320 is retracted to the retracted position, the front end portion 522A of the cylinder fixing cover 520A is disposed forward of the rear end portion 511A of the platen fixing cover 510A. The position of the nozzle 320 is an arbitrary position between the contact position and the retreat position, and the approach to the heater 313 can be restricted.

As shown in fig. 1 (b), when the nozzle 320 is positioned at the contact position, the cylinder fixing cover 520A is disposed in the nozzle hole 111A of the fixed platen 110A. The nozzle hole 111A is formed so that the fixed platen 110A and the cylinder fixing cover 520A do not interfere with each other.

The nozzle hole 111A is formed in accordance with the outer shape of the cylinder fixing cover 520A. When the volume of the nozzle hole 111A becomes large, the rigidity of the fixed platen 110A decreases. In order to increase the rigidity of the fixed platen 110A, the portion of the nozzle hole 111A inserted into the cylinder fixing cover 520A may be shortened. If the cylinder fixing cover 520A is shortened, the platen fixing cover 510A is lengthened accordingly. The platen fixing cover 510B shown in fig. 2 is longer than the platen fixing cover 510A shown in fig. 1. At this time, as shown in fig. 2 (B), advancing the injection device 300 causes the injection device 300 to collide with the platen fixing cover 510B before the nozzle 320 contacts the stationary mold 810. On the other hand, the cylinder fixing cover 520A shown in fig. 1 is longer than the cylinder fixing cover 520B shown in fig. 2. At this time, the platen fixing cover 510A can be shortened, but the rigidity of the fixed platen 110A is lowered by the extended cylinder fixing cover 520A.

The nozzle hole 111A has a large diameter hole portion 112A and a small diameter hole portion 113A having a smaller diameter than the large diameter hole portion 112A. The nozzle 320 is inserted into the small-diameter hole 113A, and therefore the diameter of the small-diameter hole 113A is larger than the diameter of the nozzle 320. Since cylinder 310 is not inserted into small-diameter hole 113A, the diameter of small-diameter hole 113A may be smaller than the outer diameter of cylinder 310. On the other hand, since the cylinder 310 is inserted into the large-diameter hole portion 112A, the hole diameter of the large-diameter hole portion 112A is larger than the outer diameter of the cylinder 310. The cylinder fixing cover 520A is inserted into the large-diameter hole portion 112A in addition to the cylinder 310. The cylinder fixing cover 520A is inserted into the large-diameter hole 112A and is not inserted into the small-diameter hole 113A.

When the cylinder fixing cover 520A is provided to be inserted into a deep position of the nozzle hole 111A, the dimension of the large diameter hole portion 112A in the X axis direction becomes large, and the dimension of the small diameter hole portion 113A in the X axis direction becomes small. Therefore, if the cylinder fixing cap 520A is provided to be inserted into a deep position of the nozzle hole 111A, the volume of the nozzle hole 111A becomes large.

In addition, the cross section perpendicular to the X-axis direction of the nozzle hole 111A may be continuously smaller from the rear side (positive side in the X-axis direction) toward the front side (negative side in the X-axis direction). At this time, if the cylinder fixing cap 520A is also inserted into a deep position of the nozzle hole 111A, the volume of the nozzle hole 111A increases. Because, the nozzle hole 111A is formed so that the fixed platen 110A and the cylinder fixed cover 520A do not interfere with each other.

The larger the volume of the nozzle hole 111A, the lower the rigidity of the fixed platen 110A. The lower the rigidity of the fixed platen 110A, the more easily the fixed platen 110A is deformed in the mold clamping process and the injection process. In the mold clamping process, a mold clamping force acts on the fixed platen 110A. In the injection process, the pressure of the molding material filled in the fixed mold 810 acts on the fixed platen 110A. The deformation of the fixed platen 110A may cause the quality of the molded product to be degraded.

Fig. 2 is a view showing a contact preventing cover according to a reference example. Fig. 2 (a) is a diagram showing a reference example of the positional relationship between the nozzle and the contact preventing cover when the position of the nozzle is the retracted position. Fig. 2 (b) is a diagram showing a reference example of the positional relationship between the nozzle and the contact preventing cover in the middle of the nozzle advancing from the retreating position to the contact position. Hereinafter, differences between the present reference example and the conventional example will be mainly described.

The nozzle hole 111B of the present reference example has a smaller volume than the nozzle hole 111A of the conventional example. Specifically, the large-diameter hole 112B of the present reference example has a smaller dimension in the X axis direction than the large-diameter hole 112A of the conventional example. The small-diameter hole 113B of the reference example has a larger dimension in the X axis direction than the small-diameter hole 113A of the conventional example.

The nozzle hole 111B of the present reference example has a smaller volume than the nozzle hole 111A of the conventional example, as described above. Therefore, the fixed platen 110B of the present reference example has higher rigidity than the fixed platen 110A of the conventional example.

The contact preventing cover 500B of the present reference example restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. The contact preventing cover 500B includes a pressure plate fixing cover 510B and a cylinder fixing cover 520B.

The cylinder fixing cap 520B of the present reference example is formed short so as to be insertable in a shallow portion of the nozzle hole 111B. This is because the volume of the nozzle hole 111B is small. More specifically, this is because the large-diameter hole portion 112B has a short dimension in the X axis direction. The distal end portion 522B of the cylinder fixing cover 520B of the present reference example is disposed rearward of the distal end portion 522A of the cylinder fixing cover 520A of the conventional example so as to be insertable in a shallow portion of the nozzle hole 111B.

The platen fixing cover 510B of the present reference example is formed to be longer by the amount of shortening of the cylinder fixing cover 520B. The rear end portion 511B of the platen fixing cover 510B of the present reference example is disposed rearward of the rear end portion 511A of the platen fixing cover 510A of the conventional example.

Since the platen fixing cover 510B extends rearward, the hopper 370 collides with the platen fixing cover 510B while the nozzle 320 advances from the retracted position to the contact position, as shown in fig. 2 (B). Therefore, the nozzle 320 cannot advance to the contact position. Since the nozzle 320 cannot be brought into contact with the fixed mold 810, the molding material cannot be filled into the fixed mold 810, and a molded product cannot be manufactured.

Disclosure of Invention

An aspect of the present invention provides a technique capable of improving the rigidity of a platen and avoiding interference between a contact prevention cover and other components.

An injection molding machine according to an aspect of the present invention includes:

a platen, on which a mold is mounted;

a cylinder body for melting a molding material;

a nozzle which is disposed at the end of the cylinder and fills the mold with a molten molding material;

a heater for heating the nozzle and the cylinder; and

a contact preventing cover for limiting the approach of the heater from both sides in the horizontal direction and the vertical direction orthogonal to the front-back direction,

the nozzle advances and retreats between a contact position where the nozzle hole of the platen contacts the mold and a retreat position retreating from the nozzle hole of the platen,

the contact preventing cover has a movable part mounted in a displaceable manner with respect to a predetermined member,

the movable portion is displaced relative to the predetermined member while the nozzle advances from the retracted position to the contact position.

Effects of the invention

According to an aspect of the present invention, the rigidity of the platen can be increased, and the interference between the contact prevention cover and other components can be avoided.

Drawings

Fig. 1 is a view showing a contact preventing cover according to a conventional example.

Fig. 2 is a view showing a contact preventing cover according to a reference example.

Fig. 3 is a diagram showing a state at the end of mold opening of the injection molding machine according to the embodiment.

Fig. 4 is a diagram showing a state of mold clamping of the injection molding machine according to the embodiment.

Fig. 5 is a view showing a touch panel according to embodiment 1.

Fig. 6 is a sectional view taken along line VI-VI of fig. 5 (b).

Fig. 7 is a view showing a touch panel according to embodiment 2.

Fig. 8 is a view showing a touch panel according to embodiment 3.

Fig. 9 is a view showing a touch panel according to embodiment 4.

Description of the symbols

10-injection molding machine, 100-mold clamping device, 110C-stationary platen (platen), 111C-nozzle hole, 300-injection device, 310-cylinder, 313-heater, 320-nozzle, 500C-contact prevention cover, 510C-platen stationary cover, 520C-cylinder stationary cover, 550C-platen movable cover (platen-side movable portion), 500F-contact prevention cover, 520F-cylinder stationary cover, 550F-cylinder movable cover (cylinder-side movable portion), 800-mold device, 810-stationary mold (mold).

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and the description thereof may be omitted.

(injection molding machine)

Fig. 3 is a diagram showing a state at the end of mold opening of the injection molding machine according to the embodiment. Fig. 4 is a diagram showing a state of mold clamping of the injection molding machine according to the embodiment. In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction indicate the horizontal direction, and the Z-axis direction indicates the vertical direction. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening/closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The Y-direction negative side is referred to as an operation side, and the Y-direction positive side is referred to as an opposite operation side.

As shown in fig. 3 to 4, the injection molding machine 10 includes a mold clamping device 100, an ejector 200, an injection device 300, a moving device 400, a control device 700, and a frame 900. The frame 900 includes a clamp frame 910 and an injection device frame 920. The mold clamping frame 910 and the injection device frame 920 are respectively provided on the floor 2 via leveling regulators 930. The control device 700 is disposed in the inner space of the injection device frame 920. Hereinafter, each constituent element of the injection molding machine 10 will be described.

(mold clamping device)

In the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 (for example, the positive X-axis direction) when the mold is closed is set to the front side, and the moving direction of the movable platen 120 (for example, the negative X-axis direction) when the mold is opened is set to the rear side.

The mold clamping device 100 closes, raises, clamps, reduces, and opens the mold of the mold device 800. The mold apparatus 800 includes a stationary mold 810 and a movable mold 820.

The mold clamping device 100 is, for example, horizontal, and the mold opening/closing direction is horizontal. The mold clamping device 100 includes a fixed platen 110, a movable platen 120, a toggle base 130, a connecting rod 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjustment mechanism 180.

The fixed platen 110 is fixed to the mold clamping unit frame 910. A fixed mold 810 is attached to the surface of the fixed platen 110 facing the movable platen 120.

The movable platen 120 is disposed on the mold clamping unit frame 910 so as to be movable in the mold opening/closing direction. A guide 101 for guiding the movable platen 120 is laid on the mold clamping unit frame 910. A movable mold 820 is attached to a surface of the movable platen 120 facing the fixed platen 110. The movable platen 120 is advanced and retreated relative to the fixed platen 110, and the mold closing, pressure increasing, mold clamping, pressure reducing, and mold opening of the mold apparatus 800 are performed.

The toggle seat 130 is disposed at a distance from the fixed platen 110, and is mounted on the mold clamping device frame 910 so as to be movable in the mold opening/closing direction. The toggle seat 130 is movably disposed along a guide laid on the mold clamping unit frame 910. The guide of the toggle seat 130 may be common with the guide 101 of the movable platen 120.

In the present embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle base 130 is disposed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction, but the toggle base 130 may be fixed to the mold clamping device frame 910, and the fixed platen 110 may be disposed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction.

The tie bar 140 connects the fixed platen 110 and the toggle seat 130 with a gap L therebetween in the mold opening and closing direction. A plurality of (e.g., 4) connecting rods 140 may be used. The plurality of tie bars 140 are arranged parallel to the mold opening and closing direction and extend according to the mold clamping force. A tie bar strain detector 141 that detects strain of the tie bar 140 may be provided to at least 1 tie bar 140. The tie-bar strain detector 141 transmits a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detection of the mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as a mold clamping force detector for detecting a mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type mold clamping force detector, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type mold clamping force detector, or the like, and the attachment position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is disposed between the movable platen 120 and the toggle base 130, and moves the movable platen 120 relative to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 includes a cross 151 and a pair of links. Each of the pair of link groups includes a 1 st link 152 and a 2 nd link 153 connected by a pin or the like to be bendable and extendable. The 1 st link 152 is attached to the movable platen 120 by a pin or the like so as to be freely swingable. The 2 nd link 153 is pivotably attached to the toggle seat 130 by a pin or the like. The 2 nd link 153 is attached to the crosshead 151 via the 3 rd link 154. When the crosshead 151 is advanced and retreated with respect to the toggle seat 130, the 1 st link 152 and the 2 nd link 153 are extended and contracted, and the movable platen 120 is advanced and retreated with respect to the toggle seat 130.

The structure of the toggle mechanism 150 is not limited to the structure shown in fig. 3 and 4. For example, in fig. 3 and 4, the number of nodes of each link group is 5, but may be 4, and one end of the 3 rd link 154 may be coupled to the nodes of the 1 st link 152 and the 2 nd link 153.

The mold clamping motor 160 is attached to the toggle seat 130 and operates the toggle mechanism 150. The mold clamping motor 160 advances and retracts the crosshead 151 relative to the toggle seat 130, thereby flexing and extending the 1 st link 152 and the 2 nd link 153 and advancing and retracting the movable platen 120 relative to the toggle seat 130. The mold clamping motor 160 is directly coupled to the motion conversion mechanism 170, but may be coupled to the motion conversion mechanism 170 via a belt, a pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The mold clamping apparatus 100 performs a mold closing process, a pressure raising process, a mold clamping process, a pressure reducing process, a mold opening process, and the like under the control of the control device 700.

In the mold closing step, the mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing end position at the set movement speed, thereby advancing the movable platen 120 so that the movable mold 820 contacts the fixed mold 810. For example, the position and the moving speed of the crosshead 151 are detected using a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and transmits a signal indicating the detection result to the control device 700.

The crosshead position detector that detects the position of the crosshead 151 and the crosshead travel speed detector that detects the travel speed of the crosshead 151 are not limited to the clamp motor encoder 161, and a general detector can be used. The movable platen position detector that detects the position of the movable platen 120 and the movable platen moving speed detector that detects the moving speed of the movable platen 120 are not limited to the clamp motor encoder 161, and a general detector can be used.

In the pressure raising step, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing end position to the mold clamping position, thereby generating a mold clamping force.

In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressure increasing step is maintained. In the mold clamping step, a cavity space 801 (see fig. 4) is formed between the movable mold 820 and the fixed mold 810, and the injection device 300 fills the cavity space 801 with a liquid molding material. The filled molding material is cured, thereby obtaining a molded article.

The number of the cavity spaces 801 may be 1 or more. In the latter case, a plurality of molded articles can be obtained at the same time. An insert may be disposed in a part of the cavity space 801 and the molding material may be filled in another part of the cavity space 801. A molded article in which the insert and the molding material are integrated can be obtained.

In the depressurizing step, the clamping motor 160 is driven to retract the crosshead 151 from the clamping position to the mold opening start position, thereby retracting the movable platen 120 to reduce the clamping force. The mold-opening start position and the mold-closing end position may be the same position.

In the mold opening step, the mold closing motor 160 is driven to retract the crosshead 151 from the mold opening start position to the mold opening end position at the set movement speed, thereby retracting the movable platen 120 and separating the movable mold 820 from the fixed mold 810. After that, the ejector 200 ejects the molded product from the movable die 820.

The setting conditions in the mold closing step, the pressure raising step, and the mold clamping step are set together as a series of setting conditions. For example, the moving speed and position of the crosshead 151 (including the mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position) and the mold clamping force in the mold closing step and the mold pressure increasing step are set together as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position are arranged in this order from the rear side toward the front side, and indicate the start point and the end point of the section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set. The mold clamping position and the mold clamping force may be set to only one of them.

The setting conditions in the pressure reducing step and the mold opening step are also set in the same manner. For example, the movement speed and the position (the mold opening start position, the movement speed switching position, and the mold opening end position) of the crosshead 151 in the pressure reducing step and the mold opening step are set together as a series of setting conditions. The mold opening start position, the movement speed switching position, and the mold opening end position are arranged in order from the front side toward the rear side, and indicate the start point and the end point of a section in which the movement speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set. The mold opening start position and the mold closing end position may be the same position. The mold opening end position and the mold closing start position may be the same position.

Instead of the moving speed and position of the crosshead 151, the moving speed and position of the movable platen 120 may be set. Instead of the position of the crosshead (for example, the mold clamping position) and the position of the movable platen, the mold clamping force may be set.

The toggle mechanism 150 increases the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. This increased magnification is also referred to as the wrist magnification. The toggle magnification changes according to an angle θ formed by the 1 st link 152 and the 2 nd link 153 (hereinafter, also referred to as "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification is maximized.

When the thickness of the mold apparatus 800 changes due to, for example, replacement of the mold apparatus 800 or a change in temperature of the mold apparatus 800, the mold thickness is adjusted so that a predetermined mold clamping force is obtained at the time of mold clamping. In the die thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle base 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time when the movable die 820 contacts the die of the fixed die 810.

The mold clamping device 100 includes a mold thickness adjusting mechanism 180. The die thickness adjustment mechanism 180 adjusts the die thickness by adjusting the interval L between the fixed platen 110 and the toggle base 130. The mold thickness adjustment time is, for example, a period from the end of the molding cycle to the start of the next molding cycle. The die thickness adjusting mechanism 180 includes, for example, a screw shaft 181 formed at the rear end of the connecting rod 140, a screw nut 182 rotatably held by the toggle base 130 so as not to advance and retreat, and a die thickness adjusting motor 183 that rotates the screw nut 182 screwed to the screw shaft 181.

A screw shaft 181 and a screw nut 182 are provided to each connecting rod 140. The rotational driving force of the die thickness adjusting motor 183 can be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmitting portion 185. The plurality of lead screw nuts 182 can be rotated in synchronization. Further, the plurality of screw nuts 182 can be rotated independently by changing the transmission path of the rotational driving force transmission portion 185.

The rotational driving force transmission portion 185 is formed of, for example, a gear. At this time, a driven gear is formed on the outer periphery of each screw nut 182, a drive gear is attached to the output shaft of the die thickness adjusting motor 183, and an intermediate gear that meshes with the plurality of driven gears and the drive gear is rotatably held in the center portion of the toggle seat 130. In addition, the rotational driving force transmitting portion 185 may be constituted by a belt, a pulley, and the like instead of the gear.

The operation of the die thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the die thickness adjustment motor 183 to rotate the lead screw nut 182. As a result, the position of the toggle seats 130 with respect to the connecting rods 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seats 130 is adjusted. In addition, a plurality of die thickness adjusting mechanisms may be used in combination.

The interval L is detected using the die thickness adjustment motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and transmits a signal indicating the detection result to the control device 700. The detection of die thickness adjustment motor encoder 184 is used to monitor and control the position and spacing L of toggle mount 130. The toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjusting motor encoder 184, and a general detector can be used.

The mold clamping device 100 of the present embodiment is a horizontal type mold clamping device in which the mold opening and closing direction is the horizontal direction, but may be a vertical type mold clamping device in which the mold opening and closing direction is the vertical direction.

The mold clamping apparatus 100 of the present embodiment includes the mold clamping motor 160 as a drive source, but may include a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may have a linear motor for opening and closing the mold and an electromagnet for clamping the mold.

(Ejection device)

In the description of the ejector 200, similarly to the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 (for example, the positive X-axis direction) at the time of mold closing is set to the front side, and the moving direction of the movable platen 120 (for example, the negative X-axis direction) at the time of mold opening is set to the rear side.

The ejector 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120. The ejector 200 includes an ejector rod 210 for ejecting a molded product from the mold apparatus 800, and a drive mechanism 220 for moving the ejector rod 210 in the X-axis direction.

The ejector rod 210 is disposed to be movable forward and backward in the through hole of the movable platen 120. The distal end of the ejector rod 210 contacts a movable member 830 disposed to be movable forward and backward inside the movable mold 820. The distal end of the ejector rod 210 may or may not be coupled to the movable member 830.

The driving mechanism 220 includes, for example, an ejector motor and a motion conversion mechanism that converts the rotational motion of the ejector motor into the linear motion of the ejector rod 210. The motion conversion mechanism includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejection device 200 performs the ejection process under the control of the control device 700. In the ejection process, the ejector rod 210 is advanced from the standby position to the ejection position at a set moving speed, and the movable member 830 is advanced to eject the molded product. Then, the ejector motor is driven to retract the ejector lever 210 at a set moving speed, so that the movable member 830 is retracted to the original standby position.

The position and moving speed of the ejector rod 210 are detected using, for example, an ejector motor encoder. The ejection motor encoder detects the rotation of the ejection motor, and transmits a signal indicating the detection result to the control device 700. The ejector rod position detector for detecting the position of the ejector rod 210 and the ejector rod movement speed detector for detecting the movement speed of the ejector rod 210 are not limited to the ejector motor encoder, and a general detector can be used.

(injection device)

In the description of the injection apparatus 300, unlike the description of the mold clamping apparatus 100 and the description of the ejector apparatus 200, the moving direction of the screw 330 during filling (for example, the X-axis negative direction) is set to the front side, and the moving direction of the screw 330 during metering (for example, the X-axis positive direction) is set to the rear side.

The injection device 300 is provided on the slide base 301, and the slide base 301 is disposed to be movable forward and backward with respect to the injection device frame 920. The injection device 300 is disposed to be movable forward and backward with respect to the mold device 800. The injection device 300 contacts the mold device 800, and fills the cavity space 801 in the mold device 800 with the molding material. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The molding material includes, for example, resin or the like. The molding material is, for example, formed into a granular shape and supplied to the supply port 311 in a solid state. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear portion of the cylinder block 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

The cylinder 310 is divided into a plurality of regions in the axial direction (for example, the X-axis direction) of the cylinder 310. Heaters 313 and temperature detectors 314 are provided in the plurality of regions, respectively. The plurality of zones are set to set temperatures, and the control device 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against the die apparatus 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the temperature detected by the nozzle 320 becomes the set temperature. The nozzle 320 and the cylinder 310 constitute a cylinder 321 with a nozzle.

The screw 330 is rotatably and reciprocatingly disposed in the cylinder 310. When the screw 330 is rotated, the molding material is conveyed forward along the spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being conveyed forward. The screw 330 is retreated as the liquid molding material is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310. When the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is ejected from the nozzle 320 and is filled into the mold apparatus 800.

A check ring 331 is attached to the front portion of the screw 330 to be movable forward and backward, and serves as a check valve, and the check ring 331 prevents the molding material from flowing backward from the front of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the check ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and is relatively retracted with respect to the screw 330 to a closed position where the flow path of the molding material is blocked (see fig. 4). This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the spiral groove of the screw 330, and moves forward relative to the screw 330 to an open position (see fig. 3) where the flow path of the molding material is opened. Thereby, the molding material is conveyed to the front of the screw 330.

The check ring 331 may be of a co-rotating type that rotates with the screw 330 and a non-co-rotating type that does not rotate with the screw 330.

The injection device 300 may have a drive source for moving the check ring 331 forward and backward between the open position and the closed position with respect to the screw 330.

The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 advances and retracts the screw 330. A motion conversion mechanism or the like that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, etc. may be provided between the screw shaft and the screw nut. The driving source for advancing and retracting the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

The pressure detector 360 detects the force transmitted between the injection motor 350 and the screw 330. The detected force is converted into a pressure by the control device 700. The pressure detector 360 is provided in a force transmission path between the injection motor 350 and the screw 330, and detects a force acting on the pressure detector 360.

The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used to control and monitor the pressure applied to the molding material by the screw 330, the back pressure applied to the screw 330, the pressure applied to the molding material from the screw 330, and the like.

The injection device 300 performs a metering process, a filling process, a pressure maintaining process, and the like under the control of the control device 700. The filling process and the pressure holding process are also collectively referred to as an injection process.

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a predetermined rotation speed, and the molding material is conveyed forward along the spiral groove of the screw 330. With this, the molding material gradually melts. The screw 330 moves backward as the liquid molding material is transported to the front of the screw 330 and accumulated in the front of the cylinder 310. The rotational speed of the screw 330 is detected, for example, using a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340, and transmits a signal indicating the detection result to the control device 700. The screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a general screw rotation speed detector can be used.

In the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to restrict the screw 330 from suddenly retreating. The back pressure against the screw 330 is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. When the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process is completed.

The position and the rotation speed of the screw 330 in the metering step are set as a series of setting conditions. For example, a measurement start position, a rotation speed switching position, and a measurement end position are set. These positions are arranged in order from the front side to the rear side, and indicate the start point and the end point of the section in which the rotation speed is set. The rotation speed is set for each interval. The number of the rotational speed switching positions may be 1 or plural. The rotational speed switching position may not be set. Further, the back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a predetermined moving speed, and the cavity space 801 in the mold apparatus 800 is filled with the liquid molding material accumulated in front of the screw 330. The position and moving speed of the screw 330 are detected using, for example, an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350, and transmits a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling step to the holding pressure step (so-called V/P switching) is performed. The position where the V/P switching is performed is also referred to as a V/P switching position. The set moving speed of the screw 330 may be changed according to the position, time, and the like of the screw 330.

The position and the moving speed of the screw 330 in the filling process are set as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a movement speed switching position, and a V/P switching position are set. These positions are arranged in order from the rear side to the front side, and indicate the start point and the end point of the section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set.

The upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by a pressure detector 360. When the detection value of the pressure detector 360 is equal to or lower than the set pressure, the screw 330 moves forward at the set moving speed. On the other hand, when the detection value of the pressure detector 360 exceeds the set pressure, the screw 330 is advanced at a moving speed slower than the set moving speed so that the detection value of the pressure detector 360 becomes equal to or lower than the set pressure for the purpose of protecting the mold.

In the filling step, after the position of the screw 330 reaches the V/P switching position, the screw 330 may be temporarily stopped at the V/P switching position and then V/P switched. Instead of stopping the screw 330, low-speed forward movement or low-speed reverse movement of the screw 330 may be performed immediately before the V/P switching. The screw position detector for detecting the position of the screw 330 and the screw movement speed detector for detecting the movement speed of the screw 330 are not limited to the injection motor encoder 351, and a general screw position detector can be used.

In the pressure retaining step, the injection motor 350 is driven to push the screw 330 forward, the pressure of the molding material at the tip end of the screw 330 (hereinafter also referred to as "holding pressure") is held at a set pressure, and the molding material remaining in the cylinder 310 is pressed toward the mold apparatus 800. The molding material can be replenished in an insufficient amount due to cooling shrinkage in the mold apparatus 800. The holding pressure is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the time elapsed after the start of the pressure holding step. The holding pressure and the holding time for holding the holding pressure in the holding pressure step may be set in plural numbers, respectively, or may be set collectively as a series of setting conditions.

In the pressure retaining step, the molding material in the cavity space 801 in the mold apparatus 800 is gradually cooled, and when the pressure retaining step is completed, the entrance of the cavity space 801 is closed by the solidified molding material. This state is referred to as gate sealing, which prevents backflow of molding material from the cavity space 801. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 801 is solidified. The metering step may be performed during the cooling step for the purpose of shortening the molding cycle time.

The injection device 300 of the present embodiment is a coaxial screw type injection device, but may be a pre-injection type injection device or the like. The preplasticizing injection device supplies the molding material melted in the plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is disposed to be rotatable and incapable of advancing and retreating or the screw is disposed to be rotatable and capable of advancing and retreating. On the other hand, the plunger is disposed to be movable forward and backward in the injection cylinder.

Further, the injection device 300 of the present embodiment is a horizontal type injection device in which the axial direction of the cylinder 310 is the horizontal direction, but may be a vertical type injection device in which the axial direction of the cylinder 310 is the vertical direction. The mold clamping device combined with the vertical injection device 300 may be a vertical mold clamping device or a horizontal mold clamping device. Similarly, the mold clamping device combined with the horizontal injection device 300 may be a horizontal mold clamping device or a vertical mold clamping device.

(moving device)

In the explanation of the moving device 400, similarly to the explanation of the injection device 300, the moving direction of the screw 330 during filling (for example, the negative X-axis direction) is set to the front side and the moving direction of the screw 330 during metering (for example, the positive X-axis direction) is set to the rear side.

The moving device 400 advances and retreats the injection device 300 with respect to the mold device 800. Then, the moving device 400 presses the nozzle 320 against the mold device 800, and generates a nozzle contact pressure. The traveling apparatus 400 includes a hydraulic pump 410, a motor 420 as a driving source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a 1 st port 411 and a 2 nd port 412. The hydraulic pump 410 is a pump capable of rotating in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420, sucking hydraulic oil (for example, oil) from one of the 1 st port 411 and the 2 nd port 412, and discharging the hydraulic oil from the other port. The hydraulic pump 410 can also suck hydraulic oil from the tank and discharge hydraulic oil from any of the 1 st port 411 and the 2 nd port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 in a rotational direction and torque according to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

The cylinder 430 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the injection device 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a 1 st chamber and a rear chamber 436 as a 2 nd chamber. The piston rod 433 is fixed to the stationary platen 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the 1 st port 411 of the hydraulic pump 410 via the 1 st flow path 401. The hydraulic oil discharged from the 1 st port 411 is supplied to the front chamber 435 through the 1 st flow path 401, and the injection device 300 is pushed forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810. Front chamber 435 functions as a pressure chamber for generating a nozzle contact pressure of nozzle 320 by the pressure of the hydraulic oil supplied from hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the 2 nd port 412 of the hydraulic pump 410 via the 2 nd flow path 402. The hydraulic oil discharged from the 2 nd port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the 2 nd flow path 402, whereby the injection device 300 is pushed rearward. The injection device 300 is retracted and the nozzle 320 is moved away from the stationary mold 810.

In the present embodiment, the moving device 400 includes the hydraulic cylinder 430, but the present invention is not limited thereto. For example, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into the linear motion of the injection device 300 may be used instead of the hydraulic cylinder 430.

(control device)

The control device 700 is constituted by a computer, for example, and as shown in fig. 3 to 4, includes a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU701 to execute a program stored in the storage medium 702. The control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The control device 700 repeats a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure maintaining process, a cooling process, a pressure reducing process, a mold opening process, an ejection process, and the like, to repeatedly manufacture a molded product. A series of operations for obtaining a molded product, for example, operations from the start of a metering step to the start of the next metering step, are also referred to as "shot" or "molding cycle". Also, the time required for 1 shot is also referred to as "molding cycle time" or "cycle time".

The one-shot molding cycle includes, for example, a metering step, a mold closing step, a pressure raising step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure reducing step, a mold opening step, and an ejection step in this order. The sequence here is the order in which the respective steps start. The filling process, the pressure maintaining process and the cooling process are performed during the mold clamping process. The start of the mold clamping process may coincide with the start of the filling process. The end of the depressurization step coincides with the start of the mold opening step.

In addition, a plurality of steps can be performed simultaneously for the purpose of shortening the molding cycle time. For example, the metering step may be performed during the cooling step of the previous molding cycle, or may be performed during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. Also, the filling process may be started during the mold closing process. Also, the ejection process may be started during the mold opening process. When an opening and closing valve that opens and closes the flow path of the nozzle 320 is provided, the mold opening process may be started during the metering process. This is because, even if the mold opening step is started during the metering step, the molding material does not leak from the nozzle 320 when the opening/closing valve closes the flow path of the nozzle 320.

The one-shot molding cycle may include steps other than a metering step, a mold closing step, a pressure raising step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure reducing step, a mold opening step, and an ejection step.

For example, after the pressure holding step is completed and before the metering step is started, a pre-metering suck-back step of moving the screw 330 backward to a preset metering start position may be performed. The pressure of the molding material accumulated in front of the screw 330 before the start of the metering process can be reduced, and the screw 330 can be prevented from rapidly retreating at the start of the metering process.

After the metering step is completed and before the filling step is started, a post-metering suck-back step of moving the screw 330 backward to a preset filling start position (also referred to as an "injection start position") may be performed. The pressure of the molding material accumulated in front of the screw 330 before the start of the filling process can be reduced, and the molding material can be prevented from leaking from the nozzle 320 before the start of the filling process.

Control device 700 is connected to operation device 750 and display device 760. Operation device 750 receives an input operation by a user, and outputs a signal corresponding to the input operation to control device 700. Display device 760 displays a display screen corresponding to an input operation in operation device 750, under the control of control device 700.

The display screen is used for setting the injection molding machine 10 and the like. A plurality of display screens are prepared, and display is switched or overlapped. The user operates the operation device 750 while viewing the display screen displayed on the display device 760 to perform setting (including input of set values) of the injection molding machine 10 and the like.

The operation device 750 and the display device 760 may be formed of a touch panel, for example, and may be integrated. Further, although the operation device 750 and the display device 760 of the present embodiment are integrated, they may be provided separately. Also, a plurality of operating devices 750 may be provided. The operation device 750 and the display device 760 are disposed on the Y-axis direction negative side of the mold clamping device 100 (more specifically, the fixed platen 110). The Y-direction negative side is referred to as an operation side, and the Y-direction positive side is referred to as an opposite operation side.

(contact preventing cover of embodiment 1)

Fig. 5 is a view showing a touch panel according to embodiment 1. Fig. 5 (a) is a view showing the positional relationship between the nozzle and the contact preventing cover in embodiment 1 when the position of the nozzle is the retracted position. Fig. 5 (b) is a diagram showing the positional relationship between the nozzle and the contact preventing cover in embodiment 1 when the nozzle is positioned at the contact position. Fig. 6 is a sectional view taken along line VI-VI of fig. 5 (b). Hereinafter, differences between the present embodiment and the reference and conventional embodiments will be mainly described.

The injection device 300 advances and retreats with respect to the fixed platen 110C. The stationary platen 110C has a stationary mold 810 mounted thereon. The fixed platen 110C has nozzle holes 111C. The nozzle hole 111C is formed in the center of the fixed platen 110C when viewed in the mold opening and closing direction, and penetrates the fixed platen 110C in the mold opening and closing direction. The nozzle holes 111C are formed vertically symmetrically. The rigidity of the fixed platen 110C can be made vertically symmetrical. The nozzle 320 is inserted into and removed from the nozzle hole 111C. The nozzle 320 advances and retreats between a retreating position (see fig. 5 (a)) and a contact position (see fig. 5 (b)).

The contact position is a position where the nozzle 320 enters the nozzle hole 111C to contact the die 810. The nozzle 320 injects the molding material accumulated inside the cylinder 310 into the inside of the stationary mold 810 at the contact position. This action is also referred to as a forming action.

The molding operation includes, for example, rotation of the screw 330 and advance and retreat of the screw 330. First, the injection device 300 rotates the screw 330, thereby conveying the molding material forward along the spiral groove of the screw 330. As the molding material accumulates in the front of the cylinder 310, the screw 330 moves backward. Thereafter, the injection device 300 advances the screw 330, and the molding material accumulated in front of the screw 330 is injected from the nozzle 320 into the fixed mold 810.

On the other hand, the ejection position is a position at which the nozzle 320 is ejected from the nozzle hole 111C. The nozzle 320 injects the molding material accumulated inside the cylinder 310 to the outside of the stationary mold 810 at the exit position. This operation is also referred to as a purge operation. The purging operation is performed, for example, when the molding operation is temporarily stopped. The molding material thermally deteriorated in the interior of the cylinder 310 can be discharged. The discharged molding material is collected in a collection tray disposed directly below the nozzle 320. The purging operation is also performed when the type of molding material in the cylinder 310 is changed. Here, the type of the molding material includes a composition of the resin, a color of the resin, and the like.

The purge operation includes, for example, rotation of the screw 330 and advance and retreat of the screw 330, similarly to the molding operation. First, the injection device 300 rotates the screw 330, thereby conveying the molding material forward along the spiral groove of the screw 330. As the molding material accumulates in the front of the cylinder 310, the screw 330 moves backward. Thereafter, the injection device 300 advances the screw 330, and injects the molding material accumulated in front of the screw 330 from the nozzle 320 to the outside of the stationary mold 810. The purging operation is repeated intermittently or continuously.

In addition, the purge action may include only the rotation of the screw 330. The injection device 300 stops the screw 330 from advancing and retreating and rotates the screw 330. By the rotation of the screw 330, the molding material is conveyed forward along the spiral groove of the screw 330. As a result, the molding material in the cylinder 310 is injected from the nozzle 320 to the outside of the fixed mold 810.

The nozzle 320 and the cylinder 310 constitute a cylinder 321 with a nozzle. The nozzle-equipped cylinder 321 has an insertion portion X1 inserted into the nozzle hole 111C and a non-insertion portion X2 not inserted into the nozzle hole 111C. When the nozzle 320 is positioned at the contact position, the non-insertion portion X2 is a portion disposed rearward of the nozzle hole 111C.

The nozzle hole 111C of the present embodiment has a smaller volume than the nozzle hole 111A of the conventional example, similarly to the nozzle hole 111B of the reference example. Specifically, the large-diameter hole 112C of the present embodiment has a smaller dimension in the X axis direction than the large-diameter hole 112A of the conventional example. The small-diameter hole 113C of the present embodiment has a larger dimension in the X axis direction than the small-diameter hole 113A of the conventional example.

The nozzle hole 111C of the present embodiment has a smaller volume than the nozzle hole 111A of the conventional example, as described above with respect to the nozzle hole 111B of the reference example. Therefore, the fixed platen 110C of the present embodiment has higher rigidity than the fixed platen 110A of the conventional example, like the fixed platen 110B of the reference example.

The contact preventing cover 500C of the present embodiment restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. The contact preventing cover 500C may or may not restrict the approach of the heater 313 from the vertical downward direction. This is because frame 900 is disposed below heater 313, and therefore it is difficult to approach heater 313 from the lower side in the vertical direction. The contact preventing cover 500C has a pressure plate fixing cover 510C and a cylinder fixing cover 520C.

The platen fixing cover 510C is fixed to the fixed platen 110C. The platen fixing cover 510C is disposed behind (on the X-axis direction positive side) the fixed platen 110C. The platen fixing cover 510C restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The platen fixing cover 510C has, for example, 2 side plates 515C and 516C perpendicular to the Y-axis direction and an upper plate 517C perpendicular to the Z-axis direction. The upper plate 517C connects upper end portions of the 2 side plates 515C, 516C.

The cylinder fixing cap 520C is fixed to the cylinder 310 and moves forward and backward together with the cylinder 310 and the nozzle 320. The cylinder fixing cover 520C includes, for example, a cylinder fixing cover main body 530C and a lower cover 540C.

The cylinder fixing cover main body 530C restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The cylinder fixing cover main body 530C has a double structure, for example, when viewed in the X-axis direction. The cylinder fixing cover main body 530C includes an inner cover 531C and an outer cover 535C disposed outside the inner cover 531C.

The inner cover 531C has, for example, 2 side plates 532C, 533C perpendicular to the Y-axis direction and an upper plate 534C projecting upward as viewed in the X-axis direction. The upper plate 534C connects the upper end portions of the 2 side plates 532C, 533C to each other. Similarly, the housing 535C has 2 side plates 536C, 537C perpendicular to the Y-axis direction and an upper plate 538C that is upwardly convex when viewed in the X-axis direction. The upper plate 538C connects the upper end portions of the 2 side plates 536C, 537C to each other.

An air layer is formed between the heater 313 and the inner cover 531C. The air layer functions as a heat insulating layer that restricts heat movement from the heater 313 to the inner cover 531C. The temperature rise of the inner cover 531C can be suppressed. Further, a heat insulator made of ceramic fiber or the like may be disposed between the heater 313 and the inner cover 531C.

An air layer is formed between the inner cover 531C and the outer cover 535C. The air layer functions as a heat insulating layer that restricts the heat transfer from the inner cover 531C to the outer cover 535C. The temperature rise of the cover 535C can be suppressed. Further, a heat insulating material made of ceramic fibers or the like may be disposed between the inner cover 531C and the outer cover 535C.

The lower cover 540C is formed in a horizontal plate shape, for example. The lower cover 540C is disposed inside the cylinder fixing cover main body 530C. An air layer is formed between the heater 313 and the lower cover 540C. The air layer functions as a heat insulating layer that restricts heat transfer from the heater 313 to the lower cover 540C. The temperature rise of the lower cover 540C can be suppressed. A heat insulating material made of ceramic fiber or the like may be disposed between the heater 313 and the lower cover 540C.

The cylinder fixing cap 520C of the present embodiment is formed short so as to be insertable in a shallow portion of the nozzle hole 111C. In the present embodiment, the cylinder fixing cap 520C is inserted in a shallow portion of the nozzle hole 111C, but may not be inserted at all in the nozzle hole. The reason why the cylinder fixing cover 520C is formed short is that the volume of the nozzle hole 111C is small. More specifically, this is because the large-diameter hole portion 112C has a short dimension in the X axis direction. The front end 522C of the cylinder fixing cover 520C of the present embodiment is disposed rearward of the front end 522A of the cylinder fixing cover 520A of the conventional example so as to be insertable into a shallow portion of the nozzle hole 111C.

The platen fixing cover 510C of the present embodiment is different from the platen fixing cover 510B of the reference example in that it does not interfere with the hopper 370. For example, the platen fixing cover 510C of the present embodiment has a dimension in the X-axis direction as large as that of the platen fixing cover 510A of the conventional example.

The contact preventing cover 500C of the present embodiment further has a platen movable cover 550C. The platen movable cover 550C is mounted to the fixed platen 110C so as to be displaceable via the platen fixed cover 510C, for example.

The platen movable cover 550C is attached to the platen fixed cover 510C, for example, so as to be able to advance and retreat. The platen cover 560C is constituted by the platen movable cover 550C and the platen fixed cover 510C. The platen cover 560C is attached to the fixed platen 110C and is disposed behind the fixed platen 110C. The platen cover 560C is a telescopic cover that extends and contracts in the X-axis direction.

The platen movable cover 550C restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction) similarly to the platen fixed cover 510C. The platen movable cover 550C includes, for example, 2 side plates 555C and 556C perpendicular to the Y-axis direction and an upper plate 557C perpendicular to the Z-axis direction. The upper plate 557C connects the upper end portions of the 2 side plates 555C, 556C to each other.

The platen movable cover 550C protrudes rearward from the platen fixed cover 510C. The platen cover 550C moves backward, and the platen cover 560C increases in dimension in the X-axis direction. On the other hand, when the platen movable cover 550C moves forward, the dimension of the platen cover 560C in the X-axis direction becomes shorter.

The contact preventing cover 500C of the present embodiment further includes a pressing portion 570C. The pressing portion 570C advances and retreats together with the cylinder 310 and the nozzle 320, and presses the platen movable cover 550C from the rear side of the platen movable cover 550C to the front side. When the platen movable cover 550C is advanced, the nozzle 320 of the moving device 400 can be driven by the driving force.

The pressing portion 570C presses the platen movable cover 550C forward on a surface 571C perpendicular to the X-axis direction. As compared with the case where the movable platen cover 550C is pushed forward on the inclined surface of the hopper 370, the movable platen cover 550C can be pushed forward straight.

The pressing portion 570C is attached to the cylinder fixing cover 520C, for example. The mounting position of the pressing portion 570C is not particularly limited. For example, the pressing portion 570C may be attached to the hopper 370, or may not be a part of the contact preventing cover 500C.

The contact preventing cover 500C of the present embodiment further has an elastic deformation portion 580C. The elastic deformation portion 580C is, for example, a spring. The elastic deformation portion 580C elastically deforms in the X-axis direction, and presses the movable platen cover 550C rearward by its elastic restoring force. When the platen movable cover 550C is retracted, the elastic restoring force of the elastic deformation portion 580C can be used.

The elastic deformation portion 580C has a rear end attached to the movable platen cover 550C and a front end attached to the fixed platen cover 510C, for example. The position of the elastic deformation portion 580C is not particularly limited. For example, the front end portion of the elastic deformation portion 580C may be attached to the fixed platen 110C.

When the moving device 400 moves the nozzle 320 forward from the retracted position to the contact position, the pressing portion 570C moves forward to abut against the platen movable cover 550C and presses the platen movable cover 550C forward. Next, while the moving device 400 moves the nozzle 320 forward to the contact position, the platen movable cover 550C moves forward against the elastic restoring force of the elastic deformation portion 580C.

On the other hand, when the moving device 400 moves the nozzle 320 backward from the contact position to the withdrawal position, the pressing portion 570C moves backward. Therefore, the platen movable cover 550C is retracted by the elastic restoring force of the elastic deformation portion 580C. When the dimension of the elastic deformation portion 580C in the X axis direction returns to the natural length and the elastic restoring force of the elastic deformation portion 580C returns to zero, the platen movable cover 550C stops. Subsequently, while the moving device 400 retracts the nozzle 320 to the retracted position, the pressing portion 570C retracts, and thus, moves away from the platen movable cover 550C.

The platen movable cover 550C of the present embodiment is an example of the platen-side movable portion described in the claims. According to the present embodiment, when the position of the nozzle 320 is the contact position, the rear end 551C of the platen movable cover 550C is disposed forward than when the position of the nozzle 320 is the withdrawal position. By the displacement of the platen movable cover 550C, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, when the position of the nozzle 320 is the retreated position, the rear end 551C of the platen movable cover 550C is disposed rearward than when the position of the nozzle 320 is the contact position. The cylinder fixing cover 520C can be formed to be correspondingly shorter by the displacement of the rear end 551C. Therefore, the cylinder fixing cap 520C can be inserted shallow in the nozzle hole 111C to reduce the volume of the nozzle hole 111C, and the rigidity of the fixed platen 110C can be improved.

Further, if the magnitude of the displacement of the rear end 551C of the platen movable cover 550C is increased, the cylinder fixed cover 520C may not be inserted into the nozzle hole 111C at all. The cylinder fixing cover 520C covers both the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321 in the present embodiment, but may cover only the non-insertion portion X2. In the latter case, since the cylinder fixing cap 520C is not inserted into the nozzle hole 111C, the volume of the nozzle hole 111C can be further reduced, and the rigidity of the fixed platen 110C can be further improved.

Further, according to the present embodiment, while the nozzle 320 advances from the retreating position to the contact position, the platen movable cover 550C is displaced forward relative to the fixed platen 110C. By the displacement of the platen movable cover 550C, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, while the nozzle 320 is retreating from the contact position to the retreat position, the platen movable cover 550C is displaced rearward with respect to the fixed platen 110C. The cylinder fixing cover 520C can be formed to be shorter by the amount of rearward displacement. Therefore, the cylinder fixing cap 520C can be inserted into a shallow portion of the nozzle hole 111C to reduce the volume of the nozzle hole 111C, and the rigidity of the fixed platen 110E can be improved.

The platen movable cover 550C of the present embodiment is not coupled to the cylinder fixing cover 520C and is not coupled to the cylinder 310. Therefore, the nozzle 320 can be moved further backward than the retreated position without disassembling the contact preventing cover 500C, and thus maintenance of the injection device 300 can be easily performed.

According to the present embodiment, the platen movable hood 550C advances as the nozzle 320 advances. The platen movable cover 550C can be moved forward by the driving force for moving the nozzle 320 of the moving device 400 forward. Further, according to the present modification, the platen movable cover 550C is retracted as the nozzle 320 is retracted. The platen movable cover 550C can be retracted by the elastic restoring force of the elastic deformation portion 580C. The elastic restoring force of the elastic deformation portion 580C is generated as the nozzle 320 advances.

In the present embodiment, the movable platen cover 550C is advanced and retreated by two forces, i.e., the driving force for advancing and retreating the nozzle 320 of the moving device 400 and the elastic restoring force of the elastic deformation portion 580C, but the method for advancing and retreating the movable platen cover 550C is not particularly limited. For example, as in embodiment 2 described below, the driving force for moving the nozzle 320 of the moving device 400 forward and backward may be used without using the elastic restoring force of the elastic deformation portion 580C.

(contact preventing cover of embodiment 2)

Fig. 7 is a view showing a touch panel according to embodiment 2. Fig. 7 (a) is a view showing the positional relationship between the nozzle and the contact preventing cover in embodiment 2 when the position of the nozzle is the retracted position. Fig. 7 (b) is a view showing the positional relationship between the nozzle and the contact preventing cover in embodiment 2 when the nozzle is at the contact position. Hereinafter, the differences between the present embodiment and embodiment 1 will be mainly described.

The nozzle hole 111D of the present embodiment has a smaller volume than the nozzle hole 111A of the conventional example, similarly to the nozzle hole 111C of the above-described embodiment 1. Therefore, the fixed platen 110D of the present embodiment has higher rigidity than the fixed platen 110A of the conventional example, similarly to the fixed platen 110C of the above-described 1 st embodiment.

The nozzle hole 111D of the present embodiment has a smaller volume than the nozzle hole 111C of the above-described embodiment 1. This is because the nozzle hole 111D includes the intermediate diameter hole 114D in addition to the large diameter hole 112D and the small diameter hole 113D.

The intermediate diameter hole 114D is formed between the large diameter hole 112D and the small diameter hole 113D. The intermediate diameter hole 114D has a smaller diameter than the large diameter hole 112D and a larger diameter than the small diameter hole 113D.

Since cylinder 310 is inserted into middle diameter hole 114D, middle diameter hole 114D has a larger aperture than the outer diameter of cylinder 310. The cylinder fixing cover 520D is inserted only into the large diameter hole 112D and not into the middle diameter hole 114D.

The nozzle hole 111D of the present embodiment has a smaller volume than the nozzle hole 111C of the above-described embodiment 1 as described above. Therefore, the fixed platen 110D of the present embodiment has higher rigidity than the fixed platen 110C of the above-described embodiment 1.

The contact preventing cover 500D of the present embodiment restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. The contact preventing cover 500D has a pressure plate fixing cover 510D and a cylinder fixing cover 520D.

The cylinder fixing cap 520D of the present embodiment is formed short so as to be inserted in a shallow portion of the nozzle hole 111D, as in the cylinder fixing cap 520C of the above-described embodiment 1. In the present embodiment, the cylinder fixing cap 520D is inserted in a shallow portion of the nozzle hole 111D, but may not be inserted at all in the nozzle hole. This is because the volume of the nozzle hole 111C is small when the cylinder fixing cover 520D is formed short. The front end 522D of the cylinder fixing cover 520D of the present embodiment is arranged rearward of the front end 522A of the cylinder fixing cover 520A of the conventional example so as to be inserted into a shallow portion of the nozzle hole 111D.

The contact preventing cover 500D of the present embodiment includes a movable platen cover 550D, similarly to the contact preventing cover 500C of embodiment 1. The platen movable cover 550D is mounted to the fixed platen 110D so as to be displaceable via the platen fixed cover 510D, for example.

The platen movable cover 550D is attached to the platen fixed cover 510D, for example, so as to be able to advance and retreat. The platen cover 560D is constituted by the platen movable cover 550D and the platen fixed cover 510D. The platen cover 560D is attached to the fixed platen 110D and is disposed behind the fixed platen 110D. The platen cover 560D is a telescopic cover that extends and contracts in the X-axis direction.

The platen movable cover 550D protrudes rearward from the platen fixed cover 510D. The platen movable cover 550D is retracted, whereby the X-axis dimension of the platen cover 560D is increased. On the other hand, when the platen movable cover 550D moves forward, the dimension of the platen cover 560D in the X-axis direction becomes shorter.

The contact preventing cover 500D of the present embodiment further includes a pressing portion 570D. The pressing portion 570D advances and retreats together with the cylinder 310 and the nozzle 320, similarly to the pressing portion 570C of embodiment 1 described above. The pressing portion 570D presses the platen movable cover 550D in both the front and rear directions, unlike the pressing portion 570C of embodiment 1.

The pressing portion 570D is attached to the cylinder fixing cover 520D, for example. The pressing portion 570D is formed in a rod shape, for example, and is arranged vertically. The pressing portion 570D is inserted into the hole 553D of the movable platen cover 550D, and presses the movable platen cover 550D in both the front and rear directions. When the platen movable cover 550D is moved forward and backward, the driving force for moving the nozzle 320 of the moving device 400 forward and backward can be used.

The hole 553D has a longer dimension in the X-axis direction than the pressing portion 570D. Inside the hole 553D, the pressing portion 570D is relatively movable in the X-axis direction. The moving distance of the platen movable cover 550D can be shortened compared to the moving distance of the nozzle 320, and the platen movable cover 550D and the fixed platen 110D can be prevented from interfering with each other.

The arrangement of the pressing portion 570D and the hole 553D may be reversed. For example, the pressing portion 570D may be attached to the movable platen cover 550D, and the hole 553D may be formed in the fixed cylinder cover 520D.

The mounting position of the pressing portion 570D is not particularly limited. For example, the pressing portion 570D may be attached to the hopper 370 or may not be a part of the contact preventing cover 500D as long as it can press the platen movable cover 550D in both the front and rear directions.

When the moving device 400 moves the nozzle 320 forward from the retracted position to the contact position, the pressing portion 570D moves forward inside the hole 553D of the platen movable cover 550D. When the pressing portion 570D reaches the front end of the hole 553D, the movable platen cover 550D is pressed forward. Subsequently, while the moving device 400 advances the nozzle 320 to the contact position, the platen movable cover 550D is pressed by the pressing portion 570D and advanced.

On the other hand, when the moving device 400 retracts the nozzle 320 from the contact position to the retracted position, the pressing portion 570D retracts inside the hole 553D of the platen movable cover 550D. When the pressing portion 570D reaches the rear end of the hole 553D, the movable platen cover 550D is pressed rearward. Subsequently, while the moving device 400 retracts the nozzle 320 to the retracted position, the platen movable cover 550D is pushed and retracted by the pushing portion 570D.

The platen movable cover 550D of the present embodiment is an example of the platen-side movable portion described in the claims. According to the present embodiment, when the position of the nozzle 320 is the contact position, the rear end 551D of the platen movable cover 550D is disposed forward, compared to when the position of the nozzle 320 is the retreat position. By the displacement of the platen movable cover 550D, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, when the position of the nozzle 320 is the retreated position, the rear end 551D of the platen movable cover 550D is disposed rearward than when the position of the nozzle 320 is the contact position. The cylinder fixing cover 520D can be formed to be correspondingly shorter by the displacement of the rear end 551D. Therefore, the cylinder fixing cap 520D can be inserted into a shallow portion of the nozzle hole 111D to reduce the volume of the nozzle hole 111D, and the rigidity of the fixing platen 110D can be improved.

Further, if the magnitude of the displacement of the rear end 551D of the platen movable cover 550D is increased, the cylinder fixed cover 520D may not be inserted into the nozzle hole 111D at all. The cylinder fixing cover 520D covers both the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321 in the present embodiment, but may cover only the non-insertion portion X2. In the latter case, since the cylinder fixing cover 520D is not inserted into the nozzle hole 111D, the volume of the nozzle hole 111D can be further reduced, and the rigidity of the fixed platen 110D can be further improved.

Further, according to the present embodiment, while the nozzle 320 advances from the retreating position to the contact position, the platen movable cover 550D is displaced forward with respect to the fixed platen 110D. By the displacement of the platen movable cover 550D, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, the platen movable cover 550D is displaced rearward with respect to the fixed platen 110D while the nozzle 320 is retreated from the contact position to the retreat position. The cylinder fixing cover 520D can be formed to be shorter by the amount of rearward displacement. Therefore, the cylinder fixing cap 520D can be inserted into a shallow portion of the nozzle hole 111D to reduce the volume of the nozzle hole 111D, and the rigidity of the fixing platen 110D can be improved.

In the present embodiment, the platen cover 560D is configured by the platen movable cover 550D and the platen fixed cover 510D, but the structure of the platen cover 560D is not particularly limited. The same applies to embodiment 1 described above. For example, the platen cover 560D may be a bellows cover having a bellows-type flexible cover between the platen movable cover 550D and the platen fixed cover 510D. The platen cover 560D may be a telescopic cover, instead of the bellows type, and may have a plurality of platen movable covers 550D. The same applies to embodiment 1 described above.

According to the present embodiment, the platen movable hood 550D advances as the nozzle 320 advances. The platen movable cover 550D can be moved forward by a driving force for moving the nozzle 320 of the moving device 400 forward. Further, according to the present modification, the platen movable cover 550D is retracted as the nozzle 320 is retracted. The platen movable cover 550D can be retracted by a driving force for retracting the nozzle 320 of the moving device 400.

In the present embodiment, the driving force for advancing and retracting the nozzle 320 of the moving device 400 is used when advancing and retracting the platen movable cover 550D, but the present invention is not limited to this. A dedicated driving device for advancing and retreating the platen movable cover 550D may be provided in addition to the moving device 400. As the driving device, for example, a hydraulic cylinder or a pneumatic cylinder is used. The same applies to embodiment 1 described above.

(contact preventing cover of embodiment 3)

Fig. 8 is a view showing a touch panel according to embodiment 3. Fig. 8 (a) is a diagram showing the positional relationship between the nozzle and the contact preventing cover in embodiment 3 when the position of the nozzle is the retracted position. Fig. 8 (b) is a diagram showing the positional relationship between the nozzle and the contact preventing cover in embodiment 3 when the nozzle is at the contact position. Hereinafter, the differences between this embodiment and embodiments 1 and 2 will be mainly described.

The nozzle hole 111E of the present embodiment has a smaller volume than the nozzle hole 111A of the conventional example, similarly to the nozzle hole 111C of the above-described embodiment 1. Therefore, the fixed platen 110E of the present embodiment has higher rigidity than the fixed platen 110A of the conventional example, similarly to the fixed platen 110C of the above-described 1 st embodiment.

The contact preventing cover 500E of the present embodiment restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. The contact preventing cover 500E has a pressure plate fixing cover 510E and a cylinder fixing cover 520E.

The contact preventing cover 500E of the present embodiment further includes a cylinder movable cover 550E, unlike the contact preventing cover 500C of embodiment 1 described above. The cylinder movable cover 550E is mounted to the cylinder 310 via, for example, the cylinder fixed cover 520E so as to be displaceable.

The cylinder movable cover 550E is attached to the cylinder fixed cover 520E so as to be able to advance and retreat, for example. The cylinder cover 560E is constituted by the cylinder movable cover 550E and the cylinder fixed cover 520E. The cylinder cover 560E is attached to the cylinder 310 and disposed so as to surround the cylinder 310. The cylinder cover 560E is a telescopic cover that extends and contracts in the X-axis direction.

The cylinder movable cover 550E restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction) similarly to the cylinder fixed cover 520E. The cylinder movable hood 550E is formed in an inverted U shape, for example, when viewed in the X-axis direction.

As shown in fig. 8 (a), the cylinder movable cover 550E protrudes forward from the cylinder fixed cover 520E. The front end 552E of the cylinder movable cover 550E is disposed forward of the rear end 511E of the platen fixed cover 510E.

The cylinder movable cover 550E retreats relative to the cylinder fixed cover 520E, whereby the dimension of the cylinder cover 560E in the X-axis direction is shortened. On the other hand, when the cylinder movable cover 550E moves forward relative to the cylinder fixed cover 520E, the dimension of the cylinder cover 560E in the X-axis direction becomes longer.

The contact preventing cover 500E of the present embodiment further includes a pressing portion 570E. The pressing portion 570E advances and retreats together with the cylinder 310 and the nozzle 320. The pressing portion 570E is attached to the cylinder fixed cover 520E, for example, and presses the cylinder movable cover 550E in both the front and rear directions.

The pressing portion 570E presses the cylinder movable cover 550E in the front-rear direction via the elastic deformation portion 580E. The elastic deformation portion 580E is, for example, a spring. The elastic deformation portion 580E elastically deforms in the X-axis direction.

The elastic deformation portion 580E is attached to the pressing portion 570E, for example, at the rear end and the cylinder movable cover 550E at the front end. The rear end of the elastic deformation portion 580E may be attached to the hopper 370.

The elastic deformation portion 580E elastically deforms, and thereby the cylinder movable cover 550E can advance and retreat relative to the cylinder fixed cover 520E. In this forward and backward movement, a driving force for advancing and retreating the nozzle 320 of the moving device 400 can be used.

When the moving device 400 moves the nozzle 320 forward from the retracted position to the contact position, the cylinder movable cover 550E moves forward together with the cylinder fixed cover 520E. When the cylinder movable cover 550E abuts against the platen fixed cover 510E, the advance is stopped. Next, while the moving device 400 advances the nozzle 320 to the contact position, the elastic deformation portion 580E contracts. As a result, the cylinder movable cover 550E retreats relative to the cylinder fixed cover 520E.

On the other hand, when the moving device 400 moves the nozzle 320 backward from the contact position to the retreat position, the cylinder fixing cover 520E moves backward together with the nozzle 320. The cylinder movable cover 550E is pressed against the platen fixed cover 510E by the elastic restoring force of the elastic deformation portion 580E without retreating. When the dimension of the elastic deformation portion 580E in the X axis direction is restored to the natural length and the elastic restoring force of the elastic deformation portion 580E is restored to zero, the cylinder movable cover 550E retreats together with the cylinder fixed cover 520E. When the position of the nozzle 320 is returned to the retracted position, the cylinder movable cover 550E protrudes forward from the cylinder fixed cover 520E.

The cylinder movable cover 550E of the present embodiment is an example of the cylinder side movable portion described in the claims. According to the present embodiment, when the position of the nozzle 320 is the contact position, the tip portion 552E of the cylinder movable cover 550E is disposed rearward with respect to the cylinder 310 than when the position of the nozzle 320 is the retreat position. By the displacement of the cylinder movable cover 550E, the nozzle 320 can be prevented from being stopped from advancing by the hopper 370, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, when the position of the nozzle 320 is the retreated position, the tip portion 552E of the cylinder movable cover 550E is disposed forward of the cylinder 310 with respect to the contact position of the nozzle 320. The cylinder movable cover 550E can be projected forward of the cylinder fixed cover 520E, and the cylinder fixed cover 520E can be made short. Therefore, the cylinder fixing cap 520E can be inserted into a shallow portion of the nozzle hole 111E to reduce the volume of the nozzle hole 111E, and the rigidity of the fixed platen 110E can be improved.

Further, according to the present embodiment, while the nozzle 320 advances from the retreating position to the contact position, the cylinder movable cover 550E is displaced rearward with respect to the cylinder 310. By the displacement of the cylinder movable cover 550E, the nozzle 320 can be prevented from being stopped from advancing by the hopper 370, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, while the nozzle 320 is retreating from the contact position to the retreat position, the cylinder movable cover 550E is displaced forward with respect to the cylinder 310. The cylinder movable cover 550E can be projected forward of the cylinder fixed cover 520E, and the cylinder fixed cover 520E can be made short. Therefore, the cylinder fixing cap 520E can be inserted into a shallow portion of the nozzle hole 111E to reduce the volume of the nozzle hole 111E, and the rigidity of the fixed platen 110E can be improved.

In the present embodiment, the cylinder fixing cover 520E covers both the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321, but may cover only the non-insertion portion X2. In the latter case, since the cylinder fixing cap 520E is not inserted into the nozzle hole 111E, the volume of the nozzle hole 111E can be further reduced, and the rigidity of the fixed platen 110E can be further improved.

Similarly, the cylinder movable cover 550E covers both the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321 when the position of the nozzle 320 is the contact position, but may cover only the non-insertion portion X2. In the latter case, since the cylinder movable cover 550E is not inserted into the nozzle hole 111E, the volume of the nozzle hole 111E can be further reduced, and the rigidity of the fixed platen 110E can be further improved.

The cylinder movable cover 550E of the present embodiment is not coupled to the platen fixing cover 510E and is not coupled to the fixed platen 110E. Therefore, the nozzle 320 can be moved further backward than the retracted position without disassembling the contact preventing cover 500E, and thus maintenance of the injection device 300 can be easily performed. Further, since the cylinder movable cover 550E advances and retreats together with the nozzle 320, the approach to the heater 313 can be restricted even when the nozzle 320 is retreated further than the retreating position.

In the present embodiment, the cylinder cover 560E is configured by the cylinder movable cover 550E and the cylinder fixed cover 520E, but the structure of the cylinder cover 560E is not particularly limited. For example, the cylinder cover 560E may be an expansion cover having a bellows-type flexible cover between the cylinder movable cover 550E and the cylinder fixed cover 520E. The cylinder cover 560E may be a telescopic type telescopic cover instead of a bellows type, and may have a plurality of cylinder movable covers 550E. The cylinder cover 560E may be combined with the platen cover 560C of the above-described embodiment 1 or the platen cover 560D of the above-described embodiment 2.

According to the present embodiment, the cylinder movable cover 550E is relatively retracted with respect to the cylinder fixed cover 520E as the nozzle 320 advances. The cylinder movable cover 550E can be retracted relative to the cylinder fixed cover 520E by the driving force for advancing and retracting the nozzle 320 of the moving device 400. Further, according to the present embodiment, the cylinder movable cover 550E moves forward relative to the cylinder fixed cover 520E as the nozzle 320 moves backward. The cylinder movable cover 550E can be moved forward relative to the cylinder fixed cover 520E by the elastic restoring force of the elastic deformation portion 580E. The elastic restoring force of the elastic deformation portion 580E is generated as the nozzle 320 advances.

In the present embodiment, the driving force for advancing and retracting the nozzle 320 of the moving device 400 is used when advancing and retracting the cylinder movable cover 550E relative to the cylinder fixed cover 520E, but the present invention is not limited to this. A dedicated driving device for advancing and retreating the cylinder movable cover 550E relative to the cylinder fixed cover 520E may be provided in addition to the moving device 400. As the driving device, for example, a hydraulic cylinder or a pneumatic cylinder is used.

(contact preventing cover of embodiment 4)

Fig. 9 is a view showing a touch panel according to embodiment 4. Fig. 9 (a) is a diagram showing the positional relationship between the nozzle and the contact preventing cover in the 4 th embodiment in which the position of the nozzle is the retracted position. Fig. 9 (b) is a diagram of embodiment 4 showing a positional relationship between the nozzle and the contact preventing cover when the nozzle is positioned at the contact position. Hereinafter, the differences between this embodiment and embodiments 1, 2, and 3 will be mainly described.

The nozzle hole 111F of the present embodiment has a smaller volume than the nozzle hole 111A of the conventional example, as in the nozzle hole 111C of the above-described 1 st embodiment. Therefore, the fixed platen 110F of the present embodiment has higher rigidity than the fixed platen 110A of the conventional example, similarly to the fixed platen 110C of the above-described 1 st embodiment.

The nozzle hole 111F of the present embodiment has a smaller volume than the nozzle hole 111C of the above-described embodiment 1. This is because the aperture of the large-diameter hole portion 112F of the present embodiment is smaller than that of the large-diameter hole portion 112C of the above-described embodiment 1.

In the present embodiment, unlike the above-described embodiment 1, the cylinder fixing cover 520F is not inserted into the large-diameter hole portion 112F. Therefore, the diameter of the large-diameter hole 112F can be reduced. The diameter of small-diameter hole 113F of the present embodiment is the same as the diameter of small-diameter hole 113C of embodiment 1 described above.

The nozzle hole 111F of the present embodiment has a smaller volume than the nozzle hole 111C of the above-described embodiment 1 as described above. Therefore, the fixed platen 110F of the present embodiment has higher rigidity than the fixed platen 110C of the above-described embodiment 1.

The contact preventing cover 500F of the present embodiment restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and the upper side in the vertical direction (the positive side in the Z-axis direction). The Y-axis direction and the Z-axis direction are directions orthogonal to the X-axis direction, and the X-axis direction is the forward and backward direction of the nozzle 320. The contact preventing cover 500F has a cylinder fixing cover 520F.

The cylinder fixing cover 520F of the present embodiment is formed short so as not to be inserted into the nozzle hole 111F at all, unlike the cylinder fixing cover 520C of the above-described embodiment 1. The cylinder fixing cap 520F is not inserted into the nozzle hole 111F at all, but may be inserted into a shallow portion thereof. This is because, when the cylinder fixing cover 520F is formed short, the volume of the nozzle hole 111F is small. The front end 522F of the cylinder fixing cover 520F of the present embodiment is arranged rearward of the front end 522A of the cylinder fixing cover 520A of the conventional example so as not to be inserted into the nozzle hole 111F at all.

In the present embodiment, the cylinder fixing cap 520F is not inserted into the nozzle hole 111F at all, but may be inserted into a shallow portion thereof. In the present embodiment, the cylinder fixing cover 520F covers only the non-insertion portion X2 of the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321, but may cover both the insertion portion X1 and the non-insertion portion X2.

The contact preventing cover 500F of the present embodiment further includes a cylinder movable cover 550F, unlike the contact preventing cover 500C of embodiment 1 described above. The cylinder movable cover 550F is attached to the cylinder 310 via, for example, the cylinder fixed cover 520F in a displaceable manner.

The cylinder movable cover 550F is rotatably attached to the cylinder fixed cover 520F, for example. The axial direction of the rotation shaft 555F of the cylinder movable cover 550F is the horizontal direction (for example, the Y-axis direction). The Y-axis direction is a direction orthogonal to the X-axis direction, and the X-axis direction is a forward/backward direction of the nozzle 320.

The cylinder movable cover 550F is rotated about a rotation shaft 555F by a rotating device such as a rotary motor. In addition, the moving device 400 may be used for the rotation of the cylinder movable hood 550F, instead of a dedicated rotating device. In the latter case, a link mechanism is provided that converts the linear motion of the moving device 400 into the rotary motion of the cylinder movable cover 550F.

The cylinder movable cover 550F restricts the approach of the heater 313 from both sides in the horizontal direction (both sides in the Y-axis direction) and from the upper side in the vertical direction (the positive side in the Z-axis direction) similarly to the cylinder fixed cover 520F. This restriction may be performed when the position of the nozzle 320 is the retracted position as shown by a solid line in fig. 9 (a). This restriction is released when the position of the nozzle 320 is the contact position as shown in fig. 9 (b). The cylinder movable cover 550F is formed in an inverted U shape when viewed in the X axis direction, for example, when restricting the approach to the heater 313.

The cylinder movable cover 550F may have a front surface portion that blocks the front of the nozzle 320 when the approach to the heater 313 is restricted. The approach from the front side (negative side in the X-axis direction) to heater 313 can be restricted. This is effective when the fixed platen 110F is not provided with a platen fixing cover or the like. The platen fixing cover and the like also have a function of restricting access from the front side to the heater 313.

The turning device turns the cylinder movable hood 550F from the position indicated by the two-dot chain line in fig. 9 (a) to the position indicated by the solid line in fig. 9 (a) before the moving device 400 advances the nozzle 320 from the retreat position toward the contact position. Additionally, the revolution may begin after the nozzle 320 begins to advance. The rotation may be completed before the nozzle 320 finishes advancing.

On the other hand, after the moving device 400 retreats the nozzle 320 from the contact position to the retreat position, the turning device turns the cylinder movable cover 550F from the position indicated by the solid line in fig. 9 (a) to the position indicated by the two-dot chain line in fig. 9 (b). In addition, the revolution may begin before the nozzle 320 finishes retracting. The revolution may end halfway the nozzle 320 retreating.

The cylinder movable cover 550F of the present embodiment is an example of the cylinder side movable portion described in the claims. According to the present embodiment, when the position of the nozzle 320 is the contact position, the tip portion 552F of the cylinder movable cover 550F is disposed rearward with respect to the cylinder 310 than when the position of the nozzle 320 is the retreat position. By the displacement of the cylinder movable cover 550F, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, when the position of the nozzle 320 is the retreated position, the tip portion 552F of the cylinder movable cover 550F is disposed forward of the cylinder 310, compared to when the position of the nozzle 320 is the contact position. The cylinder movable cover 550F can be projected forward of the cylinder fixed cover 520F, and the cylinder fixed cover 520F can be made short. This makes it possible to reduce the volume of the nozzle hole 111F without inserting the cylinder fixing cap 520F into the nozzle hole 111F at all, and to improve the rigidity of the fixed platen 110F.

Further, according to the present embodiment, when the position of the nozzle 320 is the retracted position, the cylinder movable cover 550F is disposed at a position (for example, a position indicated by a solid line in fig. 9 (a)) for restricting the approach. The cylinder movable cover 550F is displaced to a position (for example, a position shown in fig. 9 (b)) where the approach is released while the nozzle 320 advances from the retracted position to the contact position. By the displacement of the cylinder movable cover 550F, the interruption of the advance of the nozzle 320 by the hopper 370 can be avoided, and the nozzle 320 can be advanced to the contact position.

Further, according to the present embodiment, when the position of the nozzle 320 is the contact position, the cylinder movable cover 550F is disposed at the position (for example, the position shown in fig. 9 (b)) where the approach is released. The cylinder movable cover 550F is displaced to a position (for example, a position indicated by a solid line in fig. 9 (a)) where the approach is restricted while the nozzle 320 is retreated from the contact position to the retreat position. The cylinder movable cover 550F can be projected forward of the cylinder fixed cover 520F, and the cylinder fixed cover 520F can be made short. This makes it possible to reduce the volume of the nozzle hole 111F without inserting the cylinder fixing cap 520F into the nozzle hole 111F at all, and to improve the rigidity of the fixed platen 110F.

In the present embodiment, the cylinder fixing cap 520F covers only the non-insertion portion X2 of the insertion portion X1 and the non-insertion portion X2 of the nozzle-equipped cylinder 321, and therefore is not inserted into the nozzle hole 111F at all, but the present invention is not limited thereto. The cylinder fixing cover 520F can cover both the non-insertion portion X2 and the insertion portion X1 of the nozzle-equipped cylinder 321.

The cylinder movable cover 550F of the present embodiment is not coupled to the fixed platen 110F. Therefore, the nozzle 320 can be moved further backward than the retreated position without disassembling the contact preventing cover 500F, and thus maintenance of the injection device 300 can be easily performed. Further, since the cylinder movable cover 550F advances and retreats together with the nozzle 320, the approach to the heater 313 can be restricted even when the nozzle 320 is retreated further than the retreated position.

Further, the cylinder block movable cover 550F of the present embodiment may be combined with the platen cover 560C of the above-described embodiment 1 or the platen cover 560D of the above-described embodiment 2. The cylinder cover may be constituted by the cylinder cover 550F of the present embodiment, the cylinder cover 550E of the above-described 3 rd embodiment, and the cylinder cover 520E of the above-described 3 rd embodiment.

The movable platen covers 550C and 550D according to embodiment 1 and embodiment 2 are attached to the fixed platens 110C and 110D so as to be able to advance and retreat, but may be attached so as to be able to rotate.

(modification example etc.)

The above description has been given of the embodiments of the injection molding machine and the like, but the present invention is not limited to the above embodiments and the like. Various changes, modifications, substitutions, additions, deletions, and combinations may be made within the scope of the claims. Of course, these also belong to the technical scope of the present invention.

Claims (10)

1. An injection molding machine is provided with:

a platen mounted with a mold;

a cylinder body for melting the molding material;

a nozzle which is disposed at the front end of the cylinder and fills the mold with a molten molding material;

a heater for heating the nozzle and the cylinder; and

a contact prevention cover for limiting the approach of the heater from both sides in the horizontal direction and the vertical direction orthogonal to the front-back direction,

the nozzle is advanced and retreated between a contact position where the nozzle hole of the platen contacts the mold and a retreat position where the nozzle hole of the platen retreats,

the contact preventing cover has a movable part mounted in a displaceable manner with respect to a predetermined member,

the movable portion is displaced relative to the predetermined member while the nozzle advances from the retreating position to the contact position,

the nozzle is moved to a position farther from the platen than the retreat position, so that maintenance of the nozzle can be performed.

2. The injection molding machine according to claim 1,

the movable portion is displaced as the nozzle advances.

3. The injection molding machine according to claim 1 or 2,

the movable portion has a platen-side movable portion mounted to be displaceable with respect to the platen.

4. The injection molding machine according to claim 3,

when the position of the nozzle is the retreating position, the rear end of the movable platen side is disposed rearward relative to the position of the nozzle when the contact position is set.

5. The injection molding machine according to claim 3 or 4,

the platen-side movable portion is displaced forward relative to the platen while the nozzle advances from the retracted position to the contact position.

6. The injection molding machine according to any one of claims 1 to 5,

the movable portion has a cylinder-side movable portion mounted to be displaceable with respect to the cylinder.

7. The injection molding machine according to claim 6,

when the position of the nozzle is the retreating position, the tip end portion of the cylinder-side movable portion is disposed rearward with respect to the cylinder than when the position of the nozzle is the contact position.

8. The injection molding machine according to claim 6 or 7,

the cylinder-side movable portion is displaced rearward relative to the cylinder while the nozzle advances from the retreat position to the contact position.

9. The injection molding machine according to any one of claims 6 to 8,

the cylinder-side movable portion is disposed at a position where the approach is restricted when the position of the nozzle is the retracted position, and is displaced to a position where the approach is released while the nozzle advances from the retracted position to the contact position.

10. A contact preventing cover for an injection molding machine, which limits the approach of a heater of an injection device from both sides in the horizontal direction and the vertical direction orthogonal to the front-back direction, the contact preventing cover comprising:

a movable part mounted to be displaceable relative to a predetermined member,

the movable part is displaced relative to a predetermined member while a nozzle of the injection device advances from a retreating position where the nozzle is retreated from a nozzle hole of a pressure plate to a contact position where the nozzle hole of the pressure plate contacts a mold,

the nozzle is moved to a position farther from the platen than the retreat position, so that maintenance of the nozzle can be performed.

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