JP3273262B2 - Synthetic resin material supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin material supply apparatus for supplying a synthetic resin material in a molten state to a required portion.
More specifically, the present invention relates to a synthetic resin material supply device in which a molten synthetic resin material extruded through an extrusion opening is cut by a cutting blade, propelled in a required direction, and supplied to a required portion.

[0002]

2. Description of the Related Art When a synthetic resin product such as a synthetic resin container lid is compression molded, it is necessary to supply a required amount of a synthetic resin material in a molten state to a mold. When a synthetic resin liner is stamped and formed on the inner surface of the top wall of a metal or synthetic resin container lid body, a required amount of synthetic resin material in a molten state must be supplied on the inner surface of the top wall of the container lid body. is necessary. In such a case, generally, a synthetic resin material supply device in a form disclosed in Japanese Patent Publication No. 1-55973 is used.

[0003] The above-mentioned synthetic resin material supply device comprises an extruding means for extruding a synthetic resin material in a molten state through an extrusion opening, and a cutting means for cutting the synthetic resin material extruded through the extrusion opening and propagating the synthetic resin material in a required direction. I have it. The extrusion means includes a die plate having a flat surface, and the extrusion opening is formed in the surface of the die plate. The cutting means includes a rotating shaft and a cutting blade mounted on the rotating shaft, and the cutting blade is moved across the extrusion opening by rotating the rotating shaft in a predetermined direction. The synthetic resin material extruded through the extrusion opening is cut by the action of a cutting blade moved across the extrusion opening, and is propelled in a required direction. Usually, the central axis of the rotating shaft extends substantially parallel to the central axis of the extrusion opening, and the cutting blade extends substantially perpendicular to the central axis of the rotating shaft.

[0004]

From the viewpoint of molding characteristics in compression molding or embossing, it is desired that the supplied synthetic resin material has a sufficiently high temperature. When raised, the tackiness increases. Therefore, in the conventional synthetic resin material supply apparatus, when the temperature of the synthetic resin material extruded through the extrusion opening is increased, the cutting blade cannot sufficiently satisfactorily cut the synthetic resin material, and the cut synthetic resin material cannot be cut. The material tends to continue to adhere to the cutting blade without being detached from the cutting blade.

In order to solve the above-mentioned problem, it is intended to increase the moving speed of the cutting blade which is moved across the extrusion opening, and the synthetic resin material supply apparatus disclosed in Japanese Patent Publication No. 1-55973 is disclosed. In this method, a rotating shaft and a cutting blade mounted on the rotating shaft are rotated at an uneven speed by an uneven speed rotating mechanism including a pair of elliptical gears, thereby increasing the moving speed of the cutting blade when crossing the extrusion opening. However, even if such a non-uniform speed mechanism is employed, the moving speed of the cutting blade cannot be sufficiently increased due to mechanical limitations or the like, and the above problem cannot always be sufficiently solved. In addition, when the above-mentioned non-uniform speed mechanism is used, not only the cutting blade but also a rotating shaft having a considerable weight are rotated at a non-uniform speed, so that a considerably large vibration is generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a technical problem of the present invention is to improve a conventional synthetic resin material supply apparatus without adding problems such as generating excessive vibration. The object is to cut the synthetic resin material sufficiently well even when the synthetic resin material extruded through the extrusion opening has a high adhesiveness, to detach the cutting material from the cutting blade satisfactorily, and to be propelled in a required direction.

[0007]

According to the present invention, in order to achieve the above technical object, the cutting blade is formed of a leaf spring, and an interference means is provided upstream of the extrusion opening when viewed in the moving direction of the cutting blade. After the cutting blade is elastically deformed by the interference means, the cutting blade is released from the interference of the interference means, and can be moved across the extrusion opening while elastically restoring.

That is, according to the present invention, as a synthetic resin material supply apparatus for achieving the above technical object, there is provided an extruding means for extruding a molten synthetic resin material through an extrusion opening, and a synthetic resin extruded through the extrusion opening. Cutting means for cutting the resin material and propelling the resin material in a required direction, the cutting means including a rotating shaft and a cutting blade mounted on the rotating shaft, wherein the rotating shaft is rotated to cut the cutting blade. In a synthetic resin material supply device which is moved across the extrusion opening, whereby the molten synthetic resin material extruded through the extrusion opening is cut and propelled in a required direction, the cutting blade is formed of a leaf spring. An interference means is disposed upstream of the extrusion opening when viewed in the direction of movement of the cutting blade, and the cutting blade is elastically deformed by the interference of the interference means. Which is released from the interference of the interference means after, is moved across the the extrusion opening while elastically restored, there is provided a synthetic resin material feeding apparatus characterized by.

[0009]

In the apparatus for feeding synthetic resin material of the present invention, the cutting blade moves across the extrusion opening when resiliently restored by being released from the interference of the interference means, and therefore, when moving across the extrusion opening. The moving speed of the cutting blade is high enough to cut the synthetic resin material sufficiently well even if the synthetic resin material extruded through the extrusion opening has high adhesiveness, and it can be properly separated from the cutting blade and propelled in the required direction. it can. Since the rotating shaft itself can be rotated at a constant speed, no excessive vibration is generated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a synthetic resin material supply apparatus constructed according to the present invention will be described below in more detail with reference to the accompanying drawings.

Referring to FIG. 1, the apparatus for feeding a synthetic resin material has an extruding means 2 and a cutting means 4.
The extrusion means 2 includes an extrusion block 6 and a die plate 8 fixed to the front surface of the extrusion block 6. An extrusion channel 10 having a circular cross section is formed in the extrusion block 6 and the die plate 8.
Are formed as extrusion openings 12 in the flat surface of the die plate 8. The upstream end of the extrusion channel 10 is connected to an outlet of a suitable extruder (not shown), and the molten synthetic resin material 14 discharged from the extruder is discharged.
Is continuously flowed through the extrusion channel 10 and extruded through the extrusion opening 12.

The cutting means 4 includes a rotating shaft 16 rotatably mounted. The rotation shaft 16 extends through the extrusion block 6 and the die plate 8. The central axis of the rotating shaft 16 extends substantially perpendicular to the surface of the die plate 8 and thus substantially parallel to the central axis of the extrusion opening 12. The tip of the rotating shaft 16 projects forward beyond the die plate 8, and a cutting blade assembly 18 is mounted on the tip. The cutting blade assembly 18 has a support member 20 and two cutting blades 22 fixed to the support member 20. The support member 20 of the cutting blade assembly 18 is mounted on the tip of the rotating shaft 16 via a mounting pin 24 so as to be tiltable in any direction. Rotary axis 1
6 is resiliently biased rearward by a suitable spring member (not shown), whereby the cutting blade 2 is moved.
The trailing edge of 2 is brought into close contact with the surface of the die plate 8. The rotary shaft 16 is drivingly connected to a rotary drive source (not shown) which may be an electric motor, and the rotary shaft 16 and the cutting blade assembly 18 mounted thereon are indicated by arrows 26 in FIG.
Are continuously rotated at a constant speed in the direction indicated by.

The construction of the extrusion block 6, the die plate 8 and the rotary shaft 16, and the manner of mounting the cutting blade assembly 18 to the rotary shaft 16 are described in Japanese Patent Publication No. 1-55973. It may be substantially the same as the device, and therefore, a detailed description thereof will be left to the above-mentioned Japanese Patent Publication No. 1-55973 and will be omitted in this specification.

Continuing with reference to FIG. 1, the support member 20 of the cutting blade assembly 18 has two support surfaces disposed parallel to each other and substantially perpendicular to the surface of the die plate 8. Having. Each of the cutting blades 22 is strip-shaped, with its base secured to each of the support surfaces of the support member 20 by fastening bolts 28. The support surface of the support member 20 is disposed substantially perpendicular to the central axis of the rotating shaft 16, so that the free end of the cutting blade 22 is substantially perpendicular to the central axis of the rotating shaft 16. Extends from. It is important that each of the cutting blades 22 is formed from a leaf spring and has a thickness t of 1 to 1.5 m.
It is preferably about m.

Referring to FIG. 2 together with FIG. 1, a suspension member 30 is mounted on the die plate 8.
The suspension member 30 has an extending portion projecting forward from the upper surface of the die plate 8 and a hanging portion hanging downward from a front end of the extending portion. An elongated hole 32 extending in a lateral direction (a direction perpendicular to the paper surface in FIG. 2) is formed in an extension of the suspension member 30, and a fastening bolt 34 is screwed to the upper surface of the die plate 8 through the elongated hole 32. As a result, the suspension member 30 is mounted on the die plate 8 so that the position of the suspension member 30 can be adjusted in the lateral direction. An elongated hole 36 that is elongated in the up-down direction is formed in a hanging portion of the suspension member 30. A shaft of a support bolt 38 is inserted through the elongated hole 36, and a fastening nut 40 is screwed to a shaft tip of the bolt 38 that projects forward beyond a hanging part of the suspension member 30. I have. The collar member 42 is provided on the shaft of the support bolt 38.
And the rolling bearing 44 is fitted, and the fastening nut 4
The rolling bearing 44 is attached to the hanging portion of the suspension member 30 so that the position of the rolling bearing 44 can be freely adjusted in the vertical direction by the fastening operation by the zero. The rolling bearing 44, which may be of ordinary form, has an inner race 46 and a rotatable outer race 48, which is located upstream of the extrusion opening 12 when viewed in the direction of movement of the cutting blade 22. It constitutes interference means.

Referring to FIG. 3 together with FIG. 1, the rotating shaft 16 is continuously rotated at a predetermined speed in the direction indicated by the arrow 26 as described above. The cutting blade 22 is also moved in accordance with the rotation of the rotating shaft 16, but the interference means, that is, the outer race 48 of the ball bearing 44 is provided in the movement path of the free end of the cutting blade 22 on the upstream side of the extrusion opening 12. Because of its position, the free end of the cutting blade 22 is interfered by the outer race 48 before the cutting blade 22 moves across the extrusion opening 12 and the base of the cutting blade 22 is moved with the rotating shaft 16 but the free end is Is prevented from moving, so that the free end of the cutting blade 22 is elastically deformed as shown by the two-dot chain line in FIG. When the rotating shaft 16 is further rotated from the state shown by the two-dot chain line in FIG. 3, the free end of the cutting blade 22 is released from the interference of the outer race 48, and elastically returns to the state shown by the solid line in FIG. I'm sick. As can be clearly understood with reference to FIG. 3, when the cutting blade 22 resiliently returns, the free end of the cutting blade 22 is pushed out of the extrusion opening 1.
2 and acts on the synthetic resin material 14 being extruded through the extrusion opening 12. The resilient restoration of the cutting blade 22 is realized at a sufficiently high speed, so that the free end of the cutting blade 22 moves across the extrusion opening 12 at a sufficiently high speed. Therefore, even when the synthetic resin material 14 extruded through the extrusion opening 12 has a considerably high temperature and its adhesiveness is high, the synthetic resin material 14 can be cut sufficiently sufficiently. Further, the cut synthetic resin material 14 is sufficiently satisfactorily separated from the cutting blade 22 without adhering to the cutting blade 22, and is propelled in a direction indicated by an arrow 50 in FIG.
For example, a compression-molded female mold 52 is synchronized with the ejection of the synthetic resin material 14 as required, and is conveyed through the synthetic resin material ejection area positioned below the extrusion opening 12, and the cutting blade 22. The synthetic resin material 14 which has been released from the container and discharged in the direction indicated by the arrow 50 is received at a required position in the female mold 52.

When the lateral position and / or the vertical position of the ball bearing 44 is appropriately changed, the degree of interference of the outer race 48 with the cutting blade 22 is changed, and thus the degree of elastic deformation and restoration of the cutting blade 22 is reduced. The timing and speed at which the free end of the cutting blade 22 moves across the extrusion opening 12 can be adjusted accordingly.

In the illustrated embodiment, the outer race 4 is rotatable.
Although the interference means is constituted by 8, the interference means can be constituted by a stationary member fixed at an appropriate position if desired. However, it is preferable to form the interference means from a rotatable member such as the outer race 48 from the viewpoint of reducing the wear and the like of the members constituting the interference means and the cutting blade 22 and extending the useful life.

[0019]

In the apparatus for feeding synthetic resin material of the present invention, the moving speed of the cutting blade moved across the extrusion opening 12 can be reduced without the need to rotate the rotating shaft at an irregular speed to generate excessive vibration. The speed can be made sufficiently high, so that even when the synthetic resin material extruded through the extrusion opening 12 has a high tackiness, the synthetic resin material can be cut sufficiently well, detached from the cutting blade, and propelled in a required direction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a synthetic resin material supply device configured according to the present invention.

FIG. 2 is a sectional view showing a part of the synthetic resin material supply device of FIG.

FIG. 3 is a side view showing a part of the synthetic resin material supply device of FIG. 1;

[Explanation of symbols]

 2: Extrusion means 4: Cutting means 6: Extrusion block 8: Die plate 10: Extrusion flow path 12: Extrusion opening 14: Synthetic resin material 16: Rotating shaft 18: Cutting blade assembly 20: Support member 22: Cutting blade 30: Suspension member 44: Rolling bearing 48: Outer race (interference means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-50107 (JP, A) JP-A-60-245517 (JP, A) JP-A-59-98812 (JP, A) 63212 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 43/02-43/34 B29C 31 / 06,47 / 08 B26D 1/26-1/29 B29B 11/02 , 9/06

Claims (6)

(57) [Claims] 1. An extruding means for extruding a molten synthetic resin material through an extrusion opening, and a cutting means for cutting the synthetic resin material extruded through the extrusion opening and propagating the synthetic resin material in a required direction. The means includes a rotating shaft and a cutting blade mounted on the rotating shaft, the rotating shaft being rotated to cause the cutting blade to move across the extrusion opening, whereby the melt extruded through the extrusion opening. In a synthetic resin material supply device in which a synthetic resin material in a state is cut and propelled in a required direction, the cutting blade is formed of a leaf spring, and is located upstream of the extrusion opening when viewed in the moving direction of the cutting blade. An interference means is provided, and the cutting blade is released from the interference of the interference means after being elastically deformed by being interfered by the interference means, and resiliently restored to push out the extrusion opening. Cut is moved by the synthetic resin material feeding apparatus characterized by. 2. The interference device according to claim 1, wherein the interference device is mounted so as to be adjustable in position, and the degree of interference of the interference device with the cutting blade can be adjusted by adjusting the position of the interference device. Synthetic resin material supply device. 3. The extrusion means includes a die plate, the extrusion opening is formed in a surface of the die plate, and a center axis of the rotating shaft of the cutting means is in alignment with a center axis of the extrusion opening. The cutting blade extends substantially parallel and the cutting blade extends substantially perpendicular to a central axis of the rotation axis.
Or the synthetic resin material supply device according to 2. 4. The synthetic resin material supply according to claim 1, wherein said interference means is rotatably mounted around a central axis extending substantially parallel to the central axis of said rotary shaft. apparatus. 5. The interference means has a cylindrical interference surface.
The synthetic resin material supply device according to claim 4. 6. The synthetic resin material supply device according to claim 5, wherein said interference means comprises an outer race of a rolling bearing.