JPH10315276A - Ink jet head molded body and injection molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding die for molding an ink jet head molded body for controlling the after-shrinkage after molding the ink jet head molded body and keeping the dimension accuracy of a molded product. SOLUTION: In an injection molding die, a continuous ink jet head molded body 10 for jetting ink and recording is molded by inserting a continuous part 14 such as a metal along the longitudinal direction of the molded body, and the injection molding die is provided with a cavity for molding the outline of the molded body and an protruded member 36 protruded into a cavity for molding engaging sections 10a engaged on both ends of the continuous part 14 on the sections of the molded body corresponding to both ends of the continuous part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article of a long ink jet head for performing recording by discharging ink.
And a mold for injection molding for molding this molded body with high precision.

[0002]

2. Description of the Related Art Hitherto, in forming an ink jet head for performing recording by discharging ink, a single resin excellent in mechanical strength, dimensional stability and ink resistance has been used. For example, a polyurethane resin, a polyimide resin, a melamine resin, a liquid crystal polymer and the like are desirable, and a resin such as polysulfone and polyether sulfone is particularly desirable from the viewpoint of injection moldability and ink resistance.

In recent years, in an ink jet recording apparatus capable of stably obtaining a high quality image at a high speed, a long head having a large number of ink discharge nozzles has been used. It has become difficult to satisfy the dimensional characteristics with a resin alone. Therefore, recently, a method of improving dimensional accuracy by insert-molding a member made of metal or the like into a molded body of an inkjet head has been adopted.

In particular, in molding an ink jet head having a long shape, a cavity is formed by holding an insert member in a fixed or movable mold and closing the fixed mold and the movable mold. Conventionally, a method of injecting a molten resin into the cavity, keeping the pressure, cooling, and taking out the resin to obtain a composite of the resin and the insert member has been conventionally performed.

[0005]

However, the above-mentioned conventional molding method has the following problems. When the insert member and the resin are integrated, the insert member and the resin are not in a state of being chemically adhered but are in a state of covering the insert member with the resin. As a result, while the thermal history is repeated, a phenomenon occurs in which the resin contracts more due to the difference in the thermal expansion coefficient between the resin and the insert member, and the resin portion cannot maintain a predetermined size.

Therefore, a surface treatment method or the like for improving the chemical compatibility with the resin, such as roughening the surface of the insert member or providing a fine undercut, has been adopted. However, such a method has a problem that not only the cost of the insert member is increased but also the effect of suppressing the shrinkage of the molded product cannot be sufficiently obtained. When a pipe-shaped rod is used as the insert member, the insert member is positioned on the movable mold by engaging the concave or convex part of the insert member with the corresponding convex or concave part of the movable mold. Then, the slide is driven by an angular pin or the like using the mold closing operation of the injection molding machine, and the protrusion or recess on the slide side is fitted into the protrusion or recess formed at both ends of the insert member, and the insert member is inserted. Hold. At this time, since the held insert member and the gate have a positional relationship facing each other,
When the molten resin is injected into the cavity, the injection pressure of the molten resin is directly applied to the insert member, and the insert member bends in the direction of flow of the molten resin (counter-gate direction) with both ends of the insert member as fulcrums. For this reason, when the quality of the molded product in which the resin and the insert member are integrated after the completion of the molding is checked, there is a problem that the deformation is large and the required dimensional accuracy is not satisfied.

Further, the ink jet head has a very fine groove-shaped portion at the portion of the ink discharge nozzle, and the dimensional accuracy required for the portion is within several μm. In order to satisfy this dimensional accuracy, it is necessary to ensure that the molten resin material reaches the fine groove. For this reason, conventionally, high mold temperature molding has been performed in which the mold is kept at a high temperature to increase the fluidity of the resin material. Further, in order to suppress the warpage (deformation) of the molded article, it is necessary to equalize the pressure in the cavity and to equalize the temperature distribution. For this reason, high-speed injection molding has been performed at the same time.

However, when a mold member having a fine groove shape is arranged in a part of the cavity of the mold, cooling of the resin filled in the fine groove portion is most delayed due to structural restrictions of the cavity. This causes uneven temperature distribution in the cavity and causes deformation. Also,
When performing multi-cavity molding, differences in the injection pressure applied to the molten resin occur due to the minute volume difference between the cavities, or the difference in the runner diameter and the gate size diameter, and the quality of the molded product varies between cavities. There is also a problem that occurs.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has as its object to suppress post-shrinkage after molding of a molded article of an inkjet head and to maintain the dimensional accuracy of the molded article. An object of the present invention is to provide a molded article of a head and an injection molding die for molding the same. Another object of the present invention is to provide a molded article of an ink jet head having high dimensional accuracy in which warpage of an insert part is prevented, and an injection molding die for molding the same.

[0010] Still another object of the present invention is to provide an injection molding die capable of molding a molded article having a fine shape portion with high precision. Still another object of the present invention is to provide an injection molding die capable of molding a molded product having a finely shaped portion in multiple pieces with high precision.

[0011]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, the injection molding die according to the present invention is a method for forming a long ink-jet head molded body that discharges ink and performs recording, along a longitudinal direction of the molded body. An injection molding mold for inserting and molding a part, wherein a cavity for molding an outer shape of the molded body, and a part of the molded body corresponding to both ends of the elongated part. And a projecting member projecting into the cavity to form a locking portion that is locked to both ends of the long component.

In the injection molding die according to the present invention, the elongated component has concave portions at both ends, and the protruding member has a convex portion inserted into the concave portion at a tip end thereof. It is characterized by having. Further, in the injection molding die according to the present invention, the projecting member has a molding portion having a larger sectional area than the projection for molding the locking portion at a base of the projection. And

Further, in the injection molding die according to the present invention, the projecting member projects into the cavity in conjunction with the closing operation of the fixed mold and the movable mold forming the cavity. It is characterized by: The injection molding die according to the present invention is characterized in that the injection molding die further includes a fluid pressure cylinder for moving the projecting member into and out of the cavity.

Further, the injection molding die according to the present invention is characterized in that the injection molding die further comprises a motor for moving the projecting member into and out of the cavity. Further, the molded article of the inkjet head according to the present invention,
A molded body of a long inkjet head that performs recording by discharging ink, a long insert part made of metal or the like, and a molded body of a resin material having the insert part therein, And a locking portion formed integrally with the molded body and locked to both ends of the insert component to suppress longitudinal contraction of the molded body.

In the molded article of an ink jet head according to the present invention, the elongated insert member has a circular cross section, and the circular cross section is cut into a D-shape at a plurality of positions in the longitudinal direction. It is characterized by having a cut portion. Further, the injection molding die according to the present invention is a long-sized inkjet head molded body that performs recording by discharging ink, and a long-sized component such as metal is inserted along the longitudinal direction thereof. An injection molding die for molding, a cavity for molding the outer shape of the molded body, a gate for injecting the molten resin into the cavity, and disposed at a position facing the gate, And a support portion for supporting the elongated component.

Further, in the injection mold according to the present invention, a plurality of the support portions are disposed at positions facing the gate, and the support portion supports the elongated component at a plurality of points in a longitudinal direction thereof. Features. Further, in the injection molding die according to the present invention, the elongated component has a concave portion at both ends thereof, and the die is fitted into the concave portion and holds the elongated component at both ends. It is characterized by further comprising a protruding member for supporting from the part.

Further, in the injection mold according to the present invention, the projecting member projects into the cavity in conjunction with a mold closing operation of the fixed mold and the movable mold forming the cavity. It is characterized by: The injection molding die according to the present invention is characterized in that the injection molding die further includes a fluid pressure cylinder for moving the projecting member into and out of the cavity.

Further, the injection mold according to the present invention is characterized in that the injection mold further comprises a motor for moving the projecting member into and out of the cavity. Further, the molded article of the inkjet head according to the present invention,
A molded article of a long inkjet head that performs recording by discharging ink, comprising: a long insert part made of metal or the like; and a molded body made of a resin material having the insert part therein. The molded body has an opening at a position facing the gate side, the opening being a mark where a support member for supporting the insert component is inserted.

Further, in the molded article of the ink jet head according to the present invention, the elongated insert member has a circular cross section, and the circular cross section is cut into a D-shape at a plurality of positions in the longitudinal direction. It is characterized by having a cut portion. Further, the injection molding die according to the present invention is a long-sized inkjet head molded body that performs recording by discharging ink, and a long-sized component such as metal is inserted along the longitudinal direction thereof. An injection molding mold for molding, a cavity for molding the outer shape of the molded body, a gate for injecting the molten resin into the cavity, disposed in a direction substantially orthogonal to the gate, And a support portion for supporting the long component.

Further, in the injection molding die according to the present invention, the elongated component has a cylindrical surface on an outer peripheral portion, and the support portion has a concave support having a curvature radius substantially equal to that of the cylindrical surface. It has a surface. Further, in the injection molding die according to the present invention, the elongated component has a concave portion at both ends thereof, and the die is fitted into the concave portion and holds the elongated component at both ends. It is characterized by further comprising a protruding member for supporting from the part.

Further, in the injection mold according to the present invention, the projecting member projects into the cavity in conjunction with a mold closing operation of a fixed mold and a movable mold forming the cavity. It is characterized by: The injection molding die according to the present invention is characterized in that the injection molding die further includes a fluid pressure cylinder for moving the projecting member into and out of the cavity.

Further, the injection molding die according to the present invention is characterized in that the injection molding die further comprises a motor for moving the projecting member into and out of the cavity. Further, the molded article of the inkjet head according to the present invention,
A molded article of a long inkjet head that performs recording by discharging ink, comprising: a long insert part made of metal or the like; and a molded body made of a resin material having the insert part therein. The molded body has an opening in a direction substantially orthogonal to the gate side, which is a trace of a support member for supporting the insert component being inserted.

In the molded article of the ink jet head according to the present invention, the elongated insert member has a circular cross section, and the circular cross section is cut into a D-shape at a plurality of longitudinal positions. It is characterized by having a cut portion. Further, the injection mold according to the present invention is an injection mold for injection-molding a molded article having a high-precision precisely shaped portion, wherein the cavity for molding the outer shape of the molded article, A compression member for partially compressing the molten resin injected into the cavity.

Further, the injection mold according to the present invention is characterized in that it further comprises a fluid pressure cylinder for driving the compression member. Further, the injection molding die according to the present invention is a long-sized inkjet head molded body that performs recording by discharging ink, and a long-sized component such as metal is inserted along the longitudinal direction thereof. An injection molding die for molding, a cavity for molding the outer shape of the molded body, a projecting member projecting into the cavity to support the elongated component from both ends, And a fluid pressure cylinder for driving the projecting member forward and backward.

Further, the injection mold according to the present invention comprises:
A molded body of a long inkjet head that performs recording by discharging ink, an injection mold for molding by inserting a long component such as a metal along the longitudinal direction thereof, A cavity for molding the outer shape of the molded body, a projecting member projecting into the cavity to support the elongated component from both ends, and a motor for driving the projecting member forward and backward. It is characterized by doing.

The molded article of the ink jet head according to the present invention is a molded article of a long ink jet head for ejecting ink to perform recording, and comprises a long insert part made of metal or the like. A molded body made of a resin material having an insert part therein, wherein the elongated insert member has a circular cross-section, and the circular cross-section is D-shaped at a plurality of longitudinal positions. It is characterized by having a cut D-cut portion.

[0027]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (First Embodiment) FIG. 1 is an external perspective view showing the shape of a molded article of a long ink jet head molded by an injection mold according to the present embodiment.

In FIG. 1, a molded body 10 of an ink-jet head includes a main body 1 formed in a long rectangular parallelepiped shape.
2, a round bar-shaped insert member 14 inserted into the center of the main body 12 along the longitudinal direction, and an orifice plate 16 attached to the front surface of the main body 12 and having a number of ink ejection holes along the longitudinal direction. It is schematically composed of

FIG. 2 shows the injection mold 18 of the present embodiment.
It is a sectional side view which shows the structure of. In FIG. 2, reference numeral 20 denotes a cavity for molding the molded body 10 of the inkjet head shown in FIG. 1. The cross section shown in FIG. This is shown in an inverted state. That is, in the cavity 20 in FIG. 2, the portion of the orifice plate 16 of the molded body 10 is located on the right side in the figure. A horizontally extending gate 22 is provided in the cavity 20.
Is connected to the gate 22, and a spool 24 extending further in the vertical direction is connected to the gate 22. Through these spools 24 and gates 22, molten resin flows into cavity 20.
It is injected inside.

The mold 18 shown in FIG. 2 has a one-piece structure, and the insert member 14 is held by the movable mold 26.
The movable mold 26 is moved upward to close the fixed mold 28 and then the molten resin is injected into the cavity 20 via the spool 24. Then, after the resin is cured, the molded body 10 is taken out by opening the mold vertically from the division plane PL. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2, and is a drawing showing a configuration for holding the insert member 14 provided on the movable mold 26 and the periphery thereof.

A movable piece 30 (see FIG. 2) for molding the main body 12 of the molded body 10 of the ink jet head is provided with a plurality of convex pins 32 for positioning the insert member 14 along the longitudinal direction of the insert member 14. (3 in form)
It is arranged to support the insert member 14 from below. The insert member 14 is formed with a hole that fits into the convex pin 32. The convex pin 32 is inserted into this hole to support the insert member 14. Also, a convex pin 36 provided on a slide piece 34 provided on the movable mold 26 and sliding in the direction of arrow C is fitted into concave portions 14a (see FIG. 5) formed at both ends of the insert member 14, and the insert is inserted. Member 14
Hold.

FIG. 4 is a view showing the shape of the convex pin 36 provided on the slide piece 34 which is a characteristic part of the present embodiment. FIG. 5 is a view showing the molded body 10 of the inkjet head molded in a state where the convex pins 36 are fitted into the concave portions 14a of the insert member 14. Convex pin 3
6 is formed in a stepped shape as shown in FIG.
The convex pin 36 is formed from a thinnest tip portion 36a fitted into the concave portion 14a of the insert member 14, a base portion 36b having an intermediate thickness formed at the base thereof, and a thickest pin body 36d. In the mold 18 of the present embodiment, the insert member 14 is held by the convex pin 36, the movable mold 26 and the fixed mold 28 are closed, and a cavity 20 is formed. When injected and filled, as shown in FIG. 5, a molded product having a stepped portion 10a of a resin portion formed at both ends of the insert member 14 is obtained.
As a result, both ends of the insert member 14 are covered with the stepped portions 10a of the resin, and the stepped portions 10a are caught on both ends of the insert member 14. Insert member 14
Of the molded body 10 can be prevented from shrinking by sliding on the surface thereof, and the dimensional accuracy of the molded body 10 can be satisfied.

As described above, in the present embodiment, by forming the convex pin 36 holding the insert member 14 into a stepped shape, the molded body 10 covering the insert member 14 is formed.
Is prevented from shrinking in the longitudinal direction, and the dimensional accuracy of the molded body 10 can be maintained. Next, a preferred ink jet apparatus including an ink jet head formed by using the injection mold of the present embodiment will be described below.

FIG. 6 shows a so-called full-line type ink jet head 40 having a width corresponding to the recording width of a recording medium, in which the effect of the present invention is most remarkable, and the ink jet head 40.
1 is a schematic diagram showing a recording device equipped with a. In FIG. 6, reference numeral 40 denotes a full-line type ink jet head, and ink is ejected from the ink jet head 40 toward a recording medium 44 such as paper or cloth conveyed by a recording medium conveying roller 42. Is recorded. In the case of the ink jet head 40 obtained by the present invention, even if the ink jet head is a long ink jet head such as a full line head, the recording quality does not deteriorate, so that a high quality printed matter can be obtained.

In this case, in particular, the ink jet head 40
Is more effective when the length in the heating resistor row direction (in other words, the length in the longitudinal direction of the head) is 30 mm or more, and particularly effective when it exceeds 60 mm. In addition,
The inkjet head obtained from the present invention includes a means (for example, an electrothermal converter or a laser beam) for generating thermal energy as energy used for ejecting ink, particularly in an inkjet recording system,
An ink jet head of a type in which a change in the state of ink is caused by thermal energy generated from this, and a recording apparatus using the same, provide excellent effects. According to such a method, it is possible to achieve higher density and higher definition of recording.

(Second Embodiment) FIG. 7 is a side sectional view showing the structure of an injection molding die 50 according to a second embodiment.
In FIG. 7, reference numeral 52 denotes a cavity for molding a molded article of the inkjet head having substantially the same shape as that shown in FIG. 1, and the cross section shown in FIG. It is shown in a state where it is turned upside down when viewed from the direction. That is, in the cavity 52 in FIG. 7, the portion of the orifice plate 16 of the molded body 10 is located on the right side in the figure. Cavity 5
2 is connected to a gate 54 extending in the horizontal direction. The gate 54 is connected to a spool 5 further extending in the vertical direction.
6 are connected. These spool 56 and gate 5
4 and the molten resin is injected into the cavity 52. Note that the molded article of the ink jet head molded in the second embodiment is strictly the molded article 10 shown in FIG.
Although the shape is slightly different from that of FIG. 1, since the shapes are roughly the same, they will be described with reference to FIG. 1 for convenience of description, and the same reference numerals will be used.

The mold 50 shown in FIG. 7 has a one-piece structure, and the insert member 14 is held by the movable mold 58.
The movable mold 58 is moved upward to close the mold 60 with the fixed mold 60, and then the molten resin is injected into the cavity 52 via the spool 56. Then, after the resin is cured, the molded body 10 is taken out by opening the mold vertically from the division plane PL. FIG. 8 is a view of FIG. 7 as viewed from the direction of arrow E, and shows a state when the injection mold 50 shown in FIG. 7 is opened up and down from the parting line PL. FIG. 9 is a flowchart showing a molding operation by the injection molding die 50.
FIG. 10 is a sectional view taken along the line DD of FIG. 7, and FIG.
It is the figure which expanded and showed the fixed type | mold 60.

First, as shown in FIG.
0 (step S2), the molded product ejection plate 62 of the movable mold 58 is advanced, and the insert member 14 is opened.
The positioning pin 64 for positioning the movable mold 5
8 (step S4). Then, the holes of the insert member 14 are fitted to the positioning pins 64 for positioning (step S6). Next, before closing the mold, the protruding plate 62 is retracted, the positioning pin 64 is lowered, and the insert member 14 is set at a predetermined position (step S8).

After setting the insert member 14, the mold is closed (step S10). In this mold closing operation, while the movable mold 58 moves to the fixed mold 60, the angular pin 66 provided on the fixed mold 60 is provided on the movable mold 58 in the left-right direction in FIG. Into the inclined hole 69 of the slide member 68 that slides. As a result, the slide member 68 slides inward, and the distal end of the support pin 70 fits into the concave portions formed at both ends of the insert member 14 to hold the insert member 14.

Further, as shown in FIG. 10, in the present embodiment, the insert member 14 is
Gate 54 due to the pressure of the molten resin injected through
A slide member 74 is provided on the movable mold 58, and a holding pin 72 is provided on a surface of the slide member 74 facing the gate 54. When closing the movable mold 58 and the fixed mold 60, the slide member 74 is rotated by an angular pin 76 provided on the fixed mold 60 shown in FIG.
And is slid in the direction of arrow F shown in FIG.
Thereby, the holding pin 7 provided on the slide member 74
2 comes into contact with the insert member 14 from the side facing the gate 54, and the insert member 14 is supported facing the pressure of the molten resin injected from the gate 54.

FIG. 12 shows a state in which the insert member 14 is held by a series of mold closing operations and the fixed mold 60 and the movable mold 58 are closed. After closing the mold, the molten resin is injected from the gate 54 into the cavity 52 (step S12). Thereafter, the resin in the cavity is kept under pressure (Step S14) and cooled and cured (Step S1).
6). Next, the movable mold 58 is moved to open the mold (step S18), the ejection plate 62 is advanced, the positioning pins 64 are ejected from the movable mold 58 (step S20), and the molded body 10 is molded. (Step S22).

FIG. 13 shows the shape of the formed body of the ink jet head formed as described above. This molded body 1
At 0, the hole 16a formed by the holding pin 72 remains on the surface of the orifice plate 16.
As described above, according to the present embodiment, when the molten resin is injected and filled into the cavity 52 from the gate 54, the injection pressure applied from the gate 54 to the insert member 14 is reduced by the holding pin 72 facing the gate 54. Since it is received, bending of the insert member 14 can be prevented, and deformation of the molded product can be reduced.

(Third Embodiment) FIG. 14 is a side sectional view showing the structure of an injection molding die 100 according to a third embodiment. In FIG. 14, reference numeral 102 denotes a cavity for molding a molded article of the inkjet head having substantially the same shape as that shown in FIG. 1, and the cross section shown in FIG. It is shown in a state where it is turned upside down when viewed from the direction. That is,
In the cavity 102 in FIG. 10, the portion of the orifice plate 16 of the molded body 10 is located on the right side in the figure. A gate 1 extending horizontally is provided in the cavity 102.
04 is connected to the gate 104, and a spool 106 extending further in the vertical direction is connected to the gate 104. The molten resin is injected into the cavity 102 through the spool 106 and the gate 104. The molded body of the ink jet head molded in the third embodiment is slightly different in shape from the molded body 10 shown in FIG. 1 strictly, but has a substantially identical shape. For convenience of explanation, FIG. 1 will be used and the same reference numerals will be used.

The mold 100 shown in FIG. 14 has a one-piece configuration, in which the insert member 14 is held by the movable mold 108, and the movable mold 108 is moved upward to form the fixed mold 110. After closing the mold, the molten resin is injected into the cavity 102 via the spool 106. Then, after the resin is cured, the mold is opened up and down from the division plane PL to form the molded body 10.
Take out.

FIG. 15 is a view of FIG. 14 as viewed from the direction of arrow E, and shows a state when the injection mold 100 shown in FIG. 14 is opened up and down from the parting line PL. FIG. 16 is a sectional view taken along line GG of FIG.
First, as shown in FIG. 15, the injection mold 100 is opened, and the molded product ejection plate 112 of the movable mold 108 is opened.
Is moved forward to project a positioning pin 114 for positioning the insert member 14 from the mold 108 on the movable side. Then, the holes of the insert member 14 are fitted to the positioning pins 114 for positioning. Next, before closing the mold, the protruding plate 112 is retracted, the positioning pin 114 is lowered, and the insert member 14 is set at a predetermined position.

After setting the insert member 14, the mold is closed. In this mold closing operation, the movable mold 108
Moves to the fixed mold 110 while the fixed mold 110 moves.
Of the movable side mold 108
In FIG. 15, the slide member 118 that slides in the left-right direction is fitted into the inclined hole 119. As a result, the slide member 118 slides inward, and the distal end of the support pin 120 fits into the concave portions formed at both ends of the insert member 14 to hold the insert member 14.

Further, as shown in FIG. 16, in this embodiment, in order to prevent the insert member 14 from bending toward the side facing the gate 104 due to the pressure of the molten resin injected through the spool 106 and the gate 104, Gate 10
A plurality of insert holding portions 124 are formed on the fixed piece 122 of the mold 110 on the fixed side perpendicular to the direction 4. Holder 12
4 is formed in a concave R shape that fits into the outer diameter of the insert member 14, as shown in FIG. 17 as viewed in the direction of arrow H in FIG. 16, and is positioned when the mold 100 is closed. The insert member 14 is sandwiched and held between the pin 114 and the pin 114 from above and below.

As described above, the insert member 14 is held by the series of closing operations of the mold, and the fixed mold 110 and the movable mold 108 are held.
FIG. 18 shows the state when the mold is closed. After closing the mold, the molten resin is injected into the cavity 102 from the gate 104. Thereafter, the resin in the cavity is kept under pressure and cooled and cured. Next, the movable mold 108 is moved to open the mold, the ejection plate 112 is moved forward, and the positioning pins 114 are ejected from the movable mold 108 to form the molded product 10.
Is removed from the mold.

FIG. 19 shows the shape of the formed body of the ink jet head formed as described above. This molded body 1
0, the holding portion 12 is provided on the upper surface of the main body 12 of the molded body.
The hole 12a formed by Step 4 remains. FIG. 20 is a view showing a modified example of the insert member 14. The insert member 14 shown in FIG.
a is formed.

FIG. 21 shows the insert member 1 shown in FIG.
FIG. 4 is a diagram showing a molded product shape when a molded product of an inkjet head is molded by the mold 100 of the present embodiment using No. 4; In this way, if the insert member 14 is partially formed in a D-shaped cross section and the D-cut portion 14a is filled with resin, the main body 12 of the molded body 10 can be formed.
Since the resin filled in the D-cut portion 14a is caught on the D-cut portion 14a of the insert member 14, the resin cannot shrink in the longitudinal direction. Thereby, the dimension in the length direction of the molded body 10 after molding is maintained at an accurate dimension.

As described above, according to the present embodiment, when the molten resin is injected and filled into the cavity 102 from the gate 104, the injection pressure applied from the gate 104 to the insert member 14 is perpendicular to the gate 104. Since the holding portion 124 receives the bending, the bending of the insert member 14 can be prevented, and the deformation of the molded product can be reduced.

(Fourth Embodiment) In the fourth embodiment, the method of driving the support pins fitted into the concave portions formed at both ends of the insert member 14 is changed. The shape of the molded body of the inkjet head and the shape of the cavity of the mold for molding the same are the same as those of the other embodiments.

FIG. 22 shows that the movable side mold 152 and the fixed side mold 154 of the injection molding die 150 are separated by a parting line P.
FIG. 2 is a diagram showing a state when the camera is opened up and down from L. FIG.
FIG. 3 is a view showing a state where the insert member 14 is set at a predetermined position of the mold 150. FIG. 24 is a view showing the shape of the insert member 14, and FIG. 25 is a flowchart showing the operation of the mold 150 in one molding cycle. FIG. 26 is a view corresponding to, for example, FIG. 10 of the second embodiment.
It is the figure which cut | disconnected it up and down in the part of 64, and saw it from below. FIG. 27 is a diagram of the fixed-side mold 154 viewed from below.

In the mold open state at the start of molding shown in FIG. 22, the projecting pin 1 installed on the movable mold 152
The protrusion 56 is protruded, and the protrusion pin 156 and the hole 14a provided in the insert member 14 shown in FIG. By returning the ejector plate 158 supporting the ejection pin 156 while the insert member 14 is temporarily held in this manner, the ejection pin 156 returns to the original position (step S32). Note that the protruding pin 156 also has a function of releasing the molded body from the mold.

FIG. 23 shows a state after the installation of the insert member. When the insert member 14 is temporarily held at a predetermined position, the fluid pressure cylinder 160 is driven to advance the support pin 162, and the support pin 162 is fitted into the concave portions at both ends of the insert member 14 to insert the insert member 14. 14 is held (step S34). Regarding the timing for driving the fluid pressure cylinder 160, the drive is started when a signal indicating that the protrusion pin 156 has returned to the original position is received. Thus, the insert member 14 is securely held.

Next, the movable mold 152 is moved to close the movable mold 152 and the fixed mold 154 (step S36). In this embodiment, in order to prevent the insert member 14 from bending to the side opposite to the gate 168 due to the pressure of the molten resin injected through the spool 166 and the gate 168, the movable side mold 152 as shown in FIG. A slide member 170 is provided, and a holding pin 172 is provided on a surface of the slide member 170 facing the gate 168.

The slide member 170 is provided with a movable mold 152.
When the mold 154 on the fixed side is closed, the angular pin 174 provided on the mold 154 on the fixed side shown in FIG. 27 fits into the inclined hole 170a of the slide member 170, and moves in the direction of arrow H shown in FIG. Slided. As a result, the holding pin 172 provided on the slide member 170 abuts on the insert member 14 from the side facing the gate 168, and the insert member 14 is supported facing the pressure of the molten resin injected from the gate 168.

Next, the molten resin is injected and filled into the mold 150 (step S38). At this time, the injection pressure of the molten resin directly applied to the insert member 14 facing the gate 168 is reduced by the holding pin 172 facing the gate 168.
Prevents the receiving insert member 14 from bending. Thereafter, the pressure in the resin in the cavity 164 is maintained (step S
40), and is cooled and hardened (Step S42). Next, the movable mold 152 is moved to open the mold (step S).
44) The protruding plate 158 is advanced, the positioning pin 156 is protruded from the movable mold 152 (step S46), and the molded body 10 (see FIG. 1) is removed from the mold (step S48).

As described above, the formed body of the ink jet head is formed. Next, FIG. 28 is a view showing a modification of the fixed-side mold, and FIG.
It is the figure which expanded and showed the part of 76 fixed pieces 178.
This modification is similar to the third embodiment, in order to prevent the insert member 14 from bending to the side facing the gate 168 due to the pressure of the molten resin injected through the spool 166 and the gate 168. A plurality of insert holding portions 180 are formed on a fixed piece 178 of a mold 176 on a fixed side in a right angle direction. The holding unit 180 shown in FIG.
As shown in FIG. 3, the insert member 14 is formed in a concave R shape that fits the outer diameter of the insert member 14, and when the mold 150 is closed, the insert member 14 is sandwiched between the positioning pin 156 from above and below. Hold with.

Here, the holding part 180 is
After injecting and filling the molten resin into the mold,
There is a possibility that the deformation of the molded article will increase due to the change in the post-shrinkage balance of the molded article. FIG. 30 shows the shape of the molded product at this time. Therefore, in order to further reduce the deformation of the molded product obtained from the mold, similarly to the third embodiment, the shape of the insert member 14 is partially cut into a D-shaped cross section, and the D cut portion is filled when the molten resin is filled. 14a is filled with resin.
FIGS. 31 and 32 show the shape of the insert part 14 and the shape of the molded product at this time.

With the above configuration, the mold 176 on the fixed side and the mold 152 on the movable side are fully closed and the molten resin is injected into the mold.
When filling, the molding pressure of the molten resin directly applied to the insert member 14 facing the gate 168 is reduced by the gate 1.
A holding portion 180 provided in a direction perpendicular to 68 prevents bending of the receiving insert member 14. Further, a D-cut portion 1 in which the cross section of the insert member 14 is partially formed in a D shape
4a is filled with the molten resin, and the filling of the resin with the plurality of holding portions 180 provided on the fixed-side mold 176 is balanced, so that after molding, the post-shrinkage balance of the molded product can be maintained.

As described above, according to the present embodiment, the insert member can be reliably held by the fluid pressure cylinder, and the molding cycle can be shortened because the mold closing speed does not need to be slowed. In addition, it is possible to prevent the mold from being damaged due to the insert member falling from a predetermined position and being caught in the cavity. Also,
The insert holding portion receives the injection pressure directly applied to the opposing insert member from the molten resin injected from the gate, thereby reducing the bending of the insert member toward the opposite side of the gate, thereby obtaining a molded body with reduced deformation of the molded product. be able to.

Further, by taking the resin filling balance of the molded product, it is possible to obtain a molded product in which the post-molding shrinkage balance is maintained and the molded product deformation is reduced, and the molded product accuracy can be satisfied. In the present embodiment, the support pin 162 has been described to be driven by the fluid pressure cylinder 160.
The drive reduction is not limited to the hydraulic cylinder, and a motor may be used.

(Fifth Embodiment) FIG. 33 is a sectional view of an injection molding mold 200 of this embodiment,
The molten resin is injected into the cavity 208 via the gate 04 and the gate 206. FIG. 34 is an external perspective view showing the shape of a molded product formed by the injection molding die 200, and FIG. 35 is a sectional view taken along the line II of FIG.

The molded article shown in FIGS. 34 and 35 is a part constituting the ink discharge nozzle portion of the ink jet head, and includes a main body 212 having an ink liquid chamber 210,
An orifice plate 214 attached to the front surface of the main body 212. A nozzle row 216 having a fine groove shape is formed at the front end of the ink liquid chamber.
The nozzle row 2 is provided in the orifice plate 214.
An ink ejection hole communicating with the nozzle 16 is formed in a later step. A chimney-shaped ink supply port 218 is connected to the main body 212, and communicates with the ink liquid chamber 210.

FIG. 36 is a view showing only the main body portion 212, and FIG. 37 is an enlarged view showing a portion J in FIG. FIG. 38 is a view of FIG. 37 viewed from the K direction.
9 is an LL sectional view of FIG. 37, and FIG. 40 is an MM sectional view of FIG. As shown in FIGS. 36 to 40, FIG.
The part shown as the part is formed in a fine groove shape,
The dimensional accuracy required for that part is extremely high,
It is an order. The dimensions indicated by * in the figure are the dimensional accuracy achieved by the present embodiment.

FIG. 41 is a sectional view showing a molding die 2 of the above-mentioned groove-shaped portion.
It is an external appearance perspective view of 22. On the upper surface of the molding die 222, a large number of grooves 220 having a peak size of 31.5 μm (micron) and a valley width of 32 μm are formed. As shown in FIG. 33, the molding die 222 is mounted on the die 200 with its shape face down. A compression member 226 having substantially the same cross-sectional area as the molding die 222 connected to the fluid pressure cylinder 224 is disposed on the side facing the molding die 222.

First, before injecting the melted resin into the cavity 208, the compression member 226 is lowered several mm from a predetermined position by the fluid pressure cylinder 224 in advance. FIG. 42 shows a state in which the compression member 226 is lowered. Due to the lowering of the compression member 226, the volume inside the cavity 208 is increased. Next, cavity 2 in this state
08 and the molten resin is injected.

Subsequently, 0 to 0.05 s after the injection is completed.
The fluid pressure cylinder 224 is operated within ec to compress the molten resin in the portion corresponding to the molding die 222 by the compression member 226. For example, in order to compress the polysulfone resin by 0.2 mm, after the injection is completed, the polysulfone resin is compressed with a pressing force of 5000 N or more, and 0.05 seconds after the injection is completed.
If compression is not performed within ec, complete compression cannot be achieved.

During the compression, it is necessary to apply the nozzle pressure also from the injection molding machine side so that the pressing force does not escape to the gate 206 and the runner 204. When the injection and compression of the molten resin are completed, the cooling and curing of the molten resin are waited, and the compression member 226, the gate 206, and the runner 2 are cooled.
The molded product is taken out by an ejector pin 202 provided in the apparatus 04.

By performing the above-described molding, in this embodiment, high dimensional accuracy as shown in FIGS. 34 to 40 is realized. The present invention can be applied to a modification or modification of the above embodiment without departing from the gist of the invention.

[0072]

As described above, according to the present invention, when an insert member made of metal or the like is integrally formed on an ink-jet head for performing recording by discharging ink, particularly a long-sized ink-jet head. The post-shrinkage of the resin portion can be suppressed without performing surface treatment or the like on the member, and the dimensions of the molded product can be satisfied and stabilized.

When the molten resin is injected and filled into the cavity of the mold from the gate, the injection pin applied to the insert member from the gate is received by the holding pin facing the gate, so that the bending of the insert member is prevented. And the deformation of the molded article can be reduced. Also, when the molten resin is injected and filled from the gate into the cavity of the mold, the injection pressure applied to the insert member from the gate is received by the holding portion in a direction perpendicular to the gate, so that the bending of the insert member can be prevented. In addition, the deformation of the molded product can be reduced.

Further, by taking the resin filling balance of the molded product, it is possible to obtain a molded product in which the post-molding shrinkage balance is maintained and the molded product deformation is reduced, and the molded product accuracy can be satisfied. In addition, by compressing the resin in the cavity, a finely shaped portion can be molded with high precision.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing the shape of a long ink-jet head molded product molded by an injection molding die according to a first embodiment.

FIG. 2 is a side sectional view showing a configuration of an injection mold according to the first embodiment.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a diagram showing a shape of a convex pin provided on a slide piece.

FIG. 5 is a diagram showing a molded body of an ink jet head molded in a state where a convex pin is fitted into a concave portion of an insert member.

FIG. 6 is a schematic diagram showing a so-called full-line type inkjet head having a width corresponding to the recording width of a recording medium and a recording apparatus equipped with the inkjet head.

FIG. 7 is a side sectional view showing a configuration of an injection mold according to a second embodiment.

8 is a view of FIG. 7 as viewed from the direction of arrow E, and is a view showing a state when the injection mold shown in FIG. 7 is opened up and down from a parting line PL.

FIG. 9 is a flowchart showing a molding operation by an injection mold.

FIG. 10 is a sectional view taken along line DD of FIG. 7;

FIG. 11 is an enlarged view of a fixed-side mold.

FIG. 12 is a diagram showing a state where the fixed mold and the movable mold are closed.

FIG. 13 is a view showing the shape of a molded article of an ink jet head.

FIG. 14 is a side sectional view showing a configuration of an injection mold according to a third embodiment.

FIG. 15 is a view of FIG. 14 viewed from the direction of arrow E, and FIG.
FIG. 5 is a diagram showing a state when the injection mold shown in FIG. 4 is opened up and down from a parting line PL.

FIG. 16 is a sectional view taken along line GG of FIG. 14;

FIG. 17 is a view of FIG. 16 as viewed from the direction of arrow H.

FIG. 18 is a view showing a state where the fixed mold and the movable mold are closed.

FIG. 19 is a view showing the shape of a molded article of an inkjet head.

FIG. 20 is a view showing a modified example of the insert member.

21 is a view showing a shape of a molded product when a molded product of an ink jet head is molded using the insert member shown in FIG. 20;

FIG. 22 is a view showing a state in which the movable mold and the fixed mold of the injection mold are opened up and down from the parting line PL.

FIG. 23 is a view showing a state where an insert member is set at a predetermined position of a mold.

FIG. 24 is a view showing the shape of an insert member.

FIG. 25 is a flowchart showing the operation of one molding cycle in the mold.

FIG. 26 is a view of a mold cut vertically at a cavity and viewed from below.

FIG. 27 is a view of the fixed-side mold as viewed from below.

FIG. 28 is a view showing a modification of the fixed-side mold.

FIG. 29 is an enlarged view of a fixed piece of a fixed-side mold.

FIG. 30 is a view showing the shape of a molded product.

FIG. 31 is a view showing the shape of an insert part.

FIG. 32 is a view showing the shape of a molded product.

FIG. 33 is a sectional view of an injection mold according to the present embodiment.

FIG. 34 is a view showing the shape of a molded product molded by the injection molding die of the fifth embodiment.

FIG. 35 is a sectional view taken along the line II of FIG. 34;

FIG. 36 is a view showing only a main body portion of a molded product.

FIG. 37 is an enlarged view of a portion J in FIG. 36;

FIG. 38 is a view of FIG. 37 as viewed from the K direction.

FIG. 39 is a sectional view taken along line LL of FIG. 37;

40 is a sectional view taken along line MM of FIG. 39.

FIG. 41 is an external perspective view of a molding die portion having a groove-shaped portion.

FIG. 42 is a view showing a state where the compression member is lowered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Molded body 12 Main body part 14 Insert member 16 Orifice plate 18 Injection molding die 20 Cavity 22 Gate 24 Spool 26 Movable mold 28 Fixed mold 30 Movable piece 32 Convex pin

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 31:00

Claims (29)

[Claims] An injection molding metal for molding a long-sized inkjet head molded body for ejecting ink to perform recording by inserting a long-sized component such as a metal along a longitudinal direction thereof. A mold for molding an outer shape of the molded body; and a portion of the molded body corresponding to both ends of the elongated component, which are locked to both ends of the elongated component. And a projecting member projecting into the cavity to form the locking portion. 2. The device according to claim 1, wherein the elongated component has a concave portion at both ends thereof, and the projecting member has a convex portion inserted into the concave portion at a distal end thereof. The mold for injection molding according to the above. 3. The projecting member according to claim 2, wherein the projecting member has a molding portion having a larger sectional area than the projection for molding the locking portion at a base of the projection. Mold for injection molding. 4. The projecting member interlocks with a mold closing operation of a fixed mold and a movable mold that form the cavity,
2. The projection as defined in claim 1, wherein said projection protrudes into said cavity.
The mold for injection molding according to 1. 5. The injection mold according to claim 1, further comprising a fluid pressure cylinder for moving the projecting member into and out of the cavity. 6. The injection molding die according to claim 1, further comprising a motor for moving the projecting member into and out of the cavity. 7. A molded article of a long ink jet head for performing recording by discharging ink, comprising a long insert part made of metal or the like, and a resin material having the insert part inside. A molded body, and a locking portion formed integrally with the molded body and locked to both ends of the insert component to suppress shrinkage in the longitudinal direction of the molded body. Of an inkjet head. 8. The elongated insert member has a circular cross-section, and has D-cut portions formed by cutting the circular cross-section into a D-shape at a plurality of locations in the longitudinal direction. 8. The molded article of the inkjet head according to 7. 9. An injection molding metal for molding a long-sized inkjet head molded body that discharges ink to perform recording by inserting a long-sized component such as a metal along a longitudinal direction thereof. A mold for molding an outer shape of the molded body, a gate for injecting a molten resin into the cavity, and a position opposed to the gate for supporting the elongated component. And a supporting part for the injection molding. 10. The injection molding according to claim 9, wherein a plurality of the support portions are arranged at positions facing the gate, and support the elongated component at a plurality of points in a longitudinal direction thereof. Mold. 11. The elongated component has concave portions at both ends, and the mold further includes a protruding member that fits into the concave portion and supports the elongated component from both ends. The mold for injection molding according to claim 9, wherein the mold is provided. 12. The device according to claim 11, wherein the projecting member projects into the cavity in conjunction with a mold closing operation of a fixed mold and a movable mold forming the cavity. Mold for injection molding. 13. The injection molding die according to claim 11, further comprising a fluid pressure cylinder for moving the projecting member into and out of the cavity. 14. The injection mold according to claim 11, further comprising a motor for moving the projecting member into and out of the cavity. 15. A molded article of a long ink jet head for performing recording by discharging ink, comprising a long insert part made of metal or the like, and a resin material having the insert part inside. And a molded body having an opening at a position facing the gate side, which is a mark where a support member for supporting the insert component is inserted. Molded body of the head. 16. The elongated insert member has a circular cross-section, and has D-cut portions formed by cutting the circular cross-section into a D-shape at a plurality of locations in the longitudinal direction. 16. A molded article of the inkjet head according to 15. 17. An injection molding metal for molding a long ink-jet head molded body for ejecting ink to perform recording by inserting a long part such as a metal along the longitudinal direction thereof. A mold for molding an outer shape of the molded body, a gate for injecting the molten resin into the cavity, and arranged in a direction substantially orthogonal to the gate to support the elongated component. And a supporting portion for performing the injection molding. 18. The device according to claim 17, wherein the elongated component has a cylindrical surface on an outer peripheral portion, and the support portion has a concave support surface having a radius of curvature substantially equal to that of the cylindrical surface. The mold for injection molding according to 1. 19. The elongated component has concave portions at both ends, and the mold further includes a protruding member that fits into the concave portion and supports the elongated component from both ends. The injection mold according to claim 17, wherein the mold is provided. 20. The method according to claim 19, wherein the projecting member projects into the cavity in conjunction with a mold closing operation of a fixed mold and a movable mold forming the cavity. Mold for injection molding. 21. The injection mold according to claim 19, further comprising a fluid pressure cylinder for moving the projecting member into and out of the cavity. 22. The injection molding die according to claim 19, further comprising a motor for moving the projecting member into and out of the cavity. 23. A molded article of a long ink jet head for performing recording by discharging ink, comprising a long insert part made of metal or the like, and a resin material having the insert part inside. A molded body, wherein the molded body has, in a direction substantially perpendicular to the gate side, an opening that is a mark into which a support member for supporting the insert component is inserted. Molded product of inkjet head. 24. The elongated insert member has a circular cross-section, and has D-cut portions formed by cutting the circular cross-section into a D-shape at a plurality of locations in the longitudinal direction. 24. A molded article of the inkjet head according to 23. 25. An injection molding die for injection-molding a molded article having a high-precision precision-shaped portion, comprising: a cavity for molding an outer shape of the molded article; and a molten resin injected into the cavity. An injection molding die, comprising: a compression member for compressively compressing. 26. The injection mold according to claim 25, further comprising a fluid pressure cylinder for driving the compression member. 27. An injection molding metal for molding a long ink-jet head molded body for discharging ink to perform recording by inserting a long part such as a metal along a longitudinal direction thereof. A mold for molding an outer shape of the molded body; a projecting member projecting into the cavity to support the elongated component from both ends; And a fluid pressure cylinder. 28. An injection molding metal for molding a long ink-jet head molded body for discharging ink to perform recording by inserting a long part such as a metal along the longitudinal direction thereof. A mold for molding an outer shape of the molded body; a projecting member projecting into the cavity to support the elongated component from both ends; and a driving device for moving the projecting member forward and backward. And a motor for injection molding. 29. A molded article of a long ink jet head for performing recording by discharging ink, comprising a long insert part made of metal or the like, and a resin material having the insert part inside. A molded body, wherein the elongated insert member has a circular cross section, and has a D-cut portion formed by cutting the circular cross section into a D-shape at a plurality of locations in the longitudinal direction. Of an inkjet head.