JPH065863Y2 - T-die lip adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a T-die lip adjusting device.

(B) Conventional technology When continuously forming a thin film using a T-die,
A lip adjusting operation is necessary to adjust the thickness of the film to a desired state and to make the thickness of the film uniform in the width direction. That is, it is necessary to rotate the lip adjusting bolt to adjust the lip clearance. Japanese Patent Sho 55-
Japanese Patent No. 38249 discloses an apparatus for automatically adjusting the lip clearance. That is, a socket wrench that can be driven by a servomotor is provided so as to be movable in the T-die width direction, and the socket wrench can be moved forward and backward by an air cylinder. At the time of adjustment work, move the socket wrench to the lip adjustment bolt position that requires adjustment,
Next, operate the air cylinder to engage the socket wrench with the lip adjustment bolt, then rotate the servo motor to rotate the lip adjustment bolt by the required amount, then operate the air cylinder to operate the socket wrench. Return to initial position. Lip adjustment is performed by performing such an operation for each lip adjustment bolt.

(C) Problems to be Solved by the Invention However, the conventional T die lip adjusting device as described above has a problem that the engagement between the socket wrench and the lip adjusting bolt cannot be released smoothly. It was
That is, the hexagonal hole cross-sectional shape of the socket wrench is slightly larger than the hexagonal shaft cross-sectional shape of the bolt so that the socket wrench can be easily engaged with the bolt. Therefore, when the bolt is rotationally driven by the socket wrench, the hexagonal corners of the bolt come into contact with the surface of the socket wrench, not the surfaces of the two contacting each other. Therefore, when the bolt is rotated with a large torque, the corner portion of the bolt is engaged with the socket wrench, and a large frictional force is generated. Therefore, the socket wrench cannot be pulled out as it is. Conventionally, in order to pull out the socket wrench, it is rotated a small amount in the opposite direction from the one that was once rotated until the bolt and the socket wrench are unengaged, and then the socket wrench is retracted. . Since it is necessary to rotate the socket wrench in the opposite direction in order to pull out the socket wrench, it is necessary to take into consideration in advance the amount of rotation to be reversed when adjusting the lip. However, rotating the socket wrench in the opposite direction in this way is not only troublesome in work but also disadvantageous in terms of adjustment accuracy. The present invention aims to solve such problems.

(D) Means for Solving the Problems In the present invention, the socket wrench and the lip adjusting bolt are provided with polygonal taper shapes, and the polygonal taper shapes are brought into frictional contact with each other to transmit the rotational force. This solves the above problem. That is, in the T-die lip adjusting device according to the present invention, the head end portion of the lip adjusting bolt has a polygonal taper shape in which the cross-sectional shape of the polygonal portion is reduced more toward the tip, and the socket wrench has a cross-sectional shape of the polygonal hole. The polygonal taper shape is reduced toward the side in a similar manner, and the inclinations of the two polygonal taper shapes are equal.

(E) Action When adjusting the lip clearance, align the axial positions of the lip adjustment bolt and socket wrench and then push the socket wrench toward the lip adjustment bolt. As a result, the tapered shape of the socket wrench closely contacts the tapered shape of the lip adjusting bolt. When the socket wrench is rotated while being pressed with a predetermined pressing force, torque is transmitted by the frictional force between the tapered portions, and the lip adjusting bolt can be rotated. After rotating the lip adjusting bolt by a predetermined amount, it is sufficient to stop the rotation of the socket wrench and retract the socket wrench. Since the socket wrench and the lip adjusting bolt are in contact with each other on the tapered surfaces, the socket wrench can be retracted without receiving resistance.

(F) Example FIG. 8 shows the entire film forming apparatus. The film 14 extruded from the lip 13 of the T-die 12 provided in the extruder 10 is cooled by the cooling roll 16, then turned by the roll 18, passed through the thickness gauge 20 and the pinch roll 22, and then the roll 24. The direction is changed by the winder 26 and the winder 26 winds it up. The clearance of the lip 13 of the T-die 12 can be adjusted by a lip adjusting bolt 28.

The adjustment of the lip adjusting bolt 28 is performed by the lip adjusting device 30 shown in FIGS. 6 and 7. The lip adjusting device 30 has a movable base 36 which is movable by being guided by a rail 34 provided on a frame 32. The movable table 36 is movable in the width direction of the T die 12. This movable base 36
Is moved by a ball screw 40 which is rotationally driven by a servo motor 38. On the movable table 36, a direction orthogonal to the moving direction of the movable table 36, that is, the T die 12
Movable table 42 that can move toward and away from
The movable table 42 is provided with a servo motor 44.
And a ball screw 46. Movable table 4
A servo motor 48 is provided on the drive shaft 2, and a socket wrench 54 is connected to the output shaft of the servo motor 48 via a speed reducer 50 and a universal joint 52. The height position of the socket wrench 54 is made to coincide with the height position of the lip adjusting bolt 28.

As shown in FIGS. 1 and 2, the socket wrench 54 has a hexagonal tapered hole. That is, the hole of the socket wrench 54 has a hexagonal cross-section, and the hexagonal cross-section hole having a similar shape gradually becomes smaller as it goes deeper into the hole. That is, each of the six faces forming the hole has an inclination of the angle θ. On the other hand, lip adjusting bolt 28
The head has a tapered shape corresponding to the tapered shape of the socket wrench 54. That is, as shown in FIGS. 3 and 4, the tip end side of the lip adjusting bolt 28 has a hexagonal cross section that gradually decreases toward the tip end side. The six faces forming this tapered shape have an inclination of an angle θ.

Next, the operation of this embodiment will be described. The thickness of the film 14 is measured by the thickness meter 20 when necessary (or at all times) such as at the start of molding. When the total thickness or the partial thickness in the width direction of the film 14 is not a predetermined value,
A signal is output from the control device (not shown) to the lip adjusting device 30 to adjust the clearance of the lip 13. That is, the servo motor 38 is driven to move the movable table 36 to a predetermined position in the width direction of the T die 12, and then the servo motor 44 is operated to advance the socket wrench 54 toward the lip adjusting bolt 28. Since the tip of the lip adjusting bolt 28 and the socket wrench 54 are provided with corresponding taper shapes, when the socket wrench 54 advances to a position where it contacts the lip adjusting bolt 28, as shown in FIG. The wrench 54 is the lip adjusting bolt 28
Inserted in. In this state, since the socket wrench 54 and the lip adjusting bolt 28 have the same taper inclination, they are in contact with each other on six sides. When the servo motor 48 is rotated while the socket wrench 54 is pressed against the lip adjusting bolt 28 with a predetermined force in this way, the lip adjusting bolt 28 is rotationally driven by the frictional forces of the six surfaces contacting each other. You can After rotating the lip adjusting bolt 28 by a predetermined amount in this way, the servo motor 48 is stopped, the servo motor 44 is rotated in the opposite direction to the case described above, and the socket wrench 54 is retracted. Since the socket wrench 54 is only in contact with the lip adjusting bolt 28 on six sides, it can be retracted without receiving resistance. Next, the servo motor 38 is operated again to move it to the position of the next lip adjusting bolt 28, and the same adjustment work as described above is performed. In addition,
When the socket wrench 54 is pressed against the lip adjusting bolt 28, a reaction force to push back the socket wrench 54 acts, but since the servo motor 44 and the ball screw 46 exert a pressing force, For example, it is possible to reliably prevent the socket wrench 54 from being pushed back because the resistance force is large as compared with the case of pressing with an air cylinder that uses compressible air.

(G) Effect of the Invention As described above, according to the present invention, since the lip adjusting bolt of the T die and the socket wrench of the lip adjusting device are brought into surface contact with each other by the tapered portion, the two Even after applying a large torque to the socket wrench, the socket wrench can be pulled out smoothly, improving workability and improving lip adjustment accuracy.

[Brief description of drawings]

1 is a sectional view of the socket wrench (a sectional view taken along the line I-I in FIG. 2), and FIG. 2 is a view seen in the direction of arrow II in FIG.
3 is a view showing a lip adjusting bolt, FIG. 4 is a view seen in the direction of arrow IV in FIG. 3, FIG. 5 is a view showing a state in which a socket wrench is inserted into the lip adjusting bolt, FIG. Is a view showing a lip adjusting device, FIG. 7 is a plan view of FIG. 6, and FIG. 8 is a view showing the entire film forming device. 12 ... T-die, 28 ... Lip adjusting bolt, 54 ...
…Socket wrench.

Claims (1)

[Scope of utility model registration request] 1. A T-die is molded by engaging a socket wrench movable in the T-die width direction with a plurality of lip adjusting bolts provided in the width direction of the T-die and rotationally driving the socket wrench. In the T-die lip adjusting device that adjusts the film thickness, the head end of the lip adjusting bolt has a polygonal taper shape in which the polygonal axis cross-sectional shape is reduced more like the tip, and the socket wrench has a polygonal hole cross-sectional shape. Is a polygonal taper shape which is reduced in a similar manner toward the rear side, and the inclinations of the two polygonal taper shapes are equal to each other.