JPH01145334A - Inverting device of bottle-making machine - Google Patents

Abstract

PURPOSE:To facilitate the optimum control of the title device according to the nature of a parison, the simplification of mechanism and the reduction of apparatus size, by using a servo motor in place of a cylinder as a power source for rotating an arm for holding a mouth-forming mold. CONSTITUTION:The inverting device is composed of a mouth-forming mold arm 12 having a mouth-holding part formed at the tip end, a shaft 13 for rotating the arm, an engaging part 20 attached to the shaft 13, a cylindrical cam 30 engaging with the engaging part 20 and a servo motor 35 rotating the cylindrical cam 30. The engaging part 20 is provided with a plurality of engaging pieces 21 arranged at equal intervals and the engaging piece 21 is engaged with a spiral protrusion 31 of the cylindrical cam 30. The shaft of the cylindrical cam 30 is connected with the output shaft of the servo motor 35 at the lower end. Accordingly, the arm 12 can be arbitrarily and flexibly rotated by the control with the motor 35. It is not necessary to use many valve mechanisms for e.g., speed regulation or cushioning of the shock caused by positioning or stopping action or many mechanisms of hydraulic machines, etc.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an improvement in an invert device for a bottle making machine.

(Prior Art) As shown in FIG. 3, an invert device for a bottle making machine is configured so that a mouth forming mold arm 50 equipped with a one-mouth mold holder 51 reciprocates at a predetermined angle. The parison P, which has been preformed in the rough mold Ml, is transferred to the finishing mold M2 by turning it upside down.

FIG. 4 shows an example of a conventional rotation mechanism of this device. In the conventional device 60, in order to rotate the one-mouth mold arm 61 by a predetermined angle, the rotation axis of the arm 61 is A pinion part 63 is provided in the pinion part 62, and a rack 64 that meshes with the pinion part 63 is provided, and this is installed in the lower cylinder! 16
5 to move up and down to reciprocate and rotate the arm 61. In order to position the arm 61, an upper stopper member 68 and a lower stopper member 69 are provided within the cylinder tube 66 of the cylinder device 65 so as to be finely adjustable. In addition, the conventional device is equipped with mechanisms such as an air flow control valve of the cylinder device 65 for adjusting the rotational speed of the arm 61 and a fluid cushion for softening the shock when the piston 67 stops.

However, in the conventional apparatus described above, since the cylinder device is used as a driving source, it is difficult to arbitrarily control the rotation speed and rotation angle of the mouth mold arm due to its nature. In addition, in the conventional device, due to the rotation of the arm, the speed gRWi and the impact l during positioning and stopping are also required.
Numerous valve mechanisms and fluid devices are required for mitigation, etc., making the entire device complex and its maintenance complicated.

(Problems to be Solved by the Invention) This invention has been proposed in view of the above-mentioned problems, and its purpose is to more freely control the rotation of the mold arm for molding the mouth part. An object of the present invention is to provide an inverting device for a bottle making machine that can be flexibly controlled and can be optimally controlled according to the properties of parisons. In addition, this invention has a simple mechanism and can downsize the device.
Another object of the present invention is to provide an invert device that is easy to maintain.

(Means for Solving the Problems) That is, in the present invention, in order to move a parison preformed in a rough mold to a finishing mold, a one-part mold arm equipped with a mouth mold holder is rotated at a predetermined angle. In the invert device configured to be freely movable, an engaging portion having a plurality of engaging elements at equal intervals is provided on the rotating shaft portion of the arm, and a cylindrical cylinder equipped with a spiral protrusion that engages with the engaging elements. The arm is characterized in that a cam is provided and the rotation of the cam is controlled by a servo motor to rotate the arm.

(Operation) According to the above-described configuration, the cylindrical cam is rotated by a desired phase amount at a desired angular velocity under the control of the servo motor.

As the cylindrical cam rotates, a rotation shaft portion having an engaging portion that engages with the cylindrical cam rotates, thereby controlling the rotation of the mouth mold arm.

(Example) Examples of the present invention will be described below with reference to the drawings. FIG. 1 of the accompanying drawings is a plan sectional view showing a part of an invert device according to an embodiment of the present invention in a cutaway section, and FIG. 2 is a side sectional view taken along line 2-2 in FIG. 1. .

As shown in FIGS. 1 and 2, the invert device 10 of the present invention includes a mouth molding die arm 11.12 having a mouth mold holder, a rotation shaft 13 thereof, and a rotation shaft 13. 13
The cylindrical cam 30 engages with the engaging portion 20 provided in the engaging portion 20, and the servo motor 35 rotates the cylindrical cam 30.

As shown in FIG. 1, the mold arm 11.12 for molding the mouth of this device is configured to be openable and closable on the left and right sides of the drawing, and a mouth mold holding portion 11A is attached to the tip of the arm 11.12.
, 12A are provided.

The rotation shaft portion 13 has bearing portions 14.1 at both ends and in the center.
5 and 16, it is rotatably held with respect to the machine base B.

Note that this rotating wheel portion 13 is provided with an opening/closing mechanism for the arm 11.12. As can be understood from the partially cutaway cross-sectional view of FIG.
The cylinder member 13B to which the arm 12 (11) is fixed is configured to be slidable only left and right. The narrow diameter portion 13C of the shaft portion 13, the cylinder member 13B and the cylinder head 1 on the end surface thereof.
A chamber 13E is configured between the shaft portion 1
Air is sent from the conduit section 13F at the center of arm 1.
2 (and 11) are opened and closed.

In the present invention, an engaging portion 20 is provided on the rotation shaft portion 13 described above.

As shown in FIG. 2, this engaging portion 20 has a plurality of engaging members 21 at equal intervals. A threaded protrusion 31 of a cylindrical cam 30, which will be described below, is engaged with the engaging element 21. In the embodiment, the engaging element 21 is constituted by a trochanter. This trochanter 21 can sandwich the cylindrical cam spiral protrusion 31 from both sides and move smoothly while rotating on the side walls of the protrusion, as its rotational direction is indicated by arrow a in the figure. This enables excellent positioning control with extremely high precision.

The cylindrical cam 30 is connected to the engager 2 of the engaging portion 20 as described above.
It has a spiral protrusion 31 that engages with 1. This cylindrical cam 30
As shown in the figure, the shaft portion 32 is rotatably held by the bearing member 16, and is connected to the output shaft 36 of the servo motor 35 at its lower end portion 32A. In the embodiment, a spline is formed on the shaft lower end 32A and the output shaft 36, and they are connected via a cylindrical member 37 that engages with them.

Note that the rotation control of the servo motor 35 is controlled by the control means that conventionally controlled the cylinder device, or by a computer that can control the entire bottle making machine.

(Effects) As shown and explained above, this invention uses a servo motor to rotate the mold arm for molding the mouth part, so it can be used, for example, when taking out a soft parison from a rough mold or moving it to a finishing mold. It is now possible to easily obtain the optimum movement according to the properties of the parison, such as by rotating the arm slowly when it is rotated, or slightly increasing the speed in the latter half of the rotation.

Further, according to the present invention, the main mechanism is constituted by the engaging part of the rotating shaft part of the mouth mold arm, one cylindrical cam, and a servo motor, and the speed adjustment and positioning can be performed as in the conventional method. Since the system does not require many mechanical parts such as valve mechanisms and fluid equipment to cushion the impact when stopped, the device can be made smaller and its maintenance can also be made easier.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing a part of an invert device according to an embodiment of the present invention in a cutaway section, FIG. 2 is a side sectional view taken along line 2-2 in FIG. 1, and FIG. FIG. 4 is a side view of the main part showing the working part of the arm of the invert device, and FIG. 4 is a side sectional view showing the conventional invert device. 10... Invert device, 11.12... Mold arm for mouth molding, 11A, 12B... Mouth mold holder, 13
. . . Rotation shaft portion, 20 . . . Engagement portion, 21 . . . Engagement element. 30... Cylindrical cam, 31... Spiral protrusion, 35...
Servo motor, B... Machine base, Ml... Rough type, M2.
...Finishing type, P...Parison.

Claims (1)

[Scope of Claims] An invert device in which a mouth mold holding arm equipped with a mouth mold holder is configured to be rotatable at a predetermined angle in order to move a parison preformed in a rough mold to a finishing mold. In this, an engaging part having a plurality of engaging elements at equal intervals is provided on the rotation shaft of the arm, a cylindrical cam having a screw-like protrusion that engages with the engaging elements is provided, and the cylindrical cam is driven by a servo motor. An invert device for a bottle making machine, characterized in that the arm is rotated under rotation control.