Inverting mechanism

Abstract

Inverting mechanism for a glass forming machine comprising at least one preform, with two mouth-holding arms (2, 3) which are adjustable between a closed position holding an opening area of ​​a cup formed in the at least one preform and an open position releasing this opening area, a central shaft (7) to which the mouth-holding arms (2, 3) are rotationally fixed and about whose central axis the mouth-holding arms (2, 3) can be pivoted from a first pivot position associated with the at least one preform to a second pivot position associated with the finished mold, and a drive device (19) with a motor unit (20) by means of which drive energy for pivoting the mouth-holding arms (2, 3) between their first and second pivot positions can be generated, characterized in thatthat the motor unit of the drive device (19) is designed as a rotary motor (20) with a stator element (25) and a rotor element (21), and that the rotor element (21) of the rotary motor (20) is axially and rotationally fixed to the central shaft (7) of the drive device (19) and the rotary motor (20) is arranged coaxially with respect to the central shaft (7) of the drive device (19).

Description

[0001] The invention relates to an inverting mechanism for a glass forming machine comprising at least one preform, with two mouth-holding arms that are adjustable between a closed position holding an opening area of ​​a cup formed in the at least one preform and an open position releasing this opening area, a central shaft to which the mouth-holding arms are rotationally fixed and about whose central axis the mouth-holding arms can be pivoted from a first pivoting position associated with the at least one preform to a second pivoting position associated with the finished form, and a drive device with a motor unit by means of which drive energy for pivoting the mouth-holding arms between their first and second pivoting positions can be generated.

[0002] In addition to pneumatically or hydraulically driven inverting mechanisms, electrically driven inverting mechanisms are also known from the prior art. What these inverting mechanisms have in common is that the drive energy generated by a motor unit of the drive device is transmitted via gears, chains, belts, racks and / or transmissions to a central shaft serving as the actuator of the inverting mechanism.

[0003] Based on the prior art described above, the invention aims to provide an inverting mechanism for a glass forming machine having at least one preform, which is easy to assemble in terms of design and which also ensures a transmission of the drive energy generated by the motor unit to the central shaft of the drive device of the inverting mechanism that is as free from disturbance and friction as possible.

[0004] This problem is solved according to the invention by designing the motor unit of the drive device as a rotary motor with a stator element and a rotor element, and by connecting the rotor element of the rotary motor axially and rotationally fixed to the central shaft of the drive device, and by arranging the rotary motor coaxially with respect to the central shaft of the drive device. Due to the integrated design of the drive device of the inverting mechanism according to the invention, the axis of rotation of the output element of the rotary motor is coaxial with the axis of rotation of the central shaft of the drive device of the inverting mechanism and thus coaxial with the pivot axis of the muzzle retaining arms of the inverting mechanism. The rotational movement of the rotor element of the rotary motor can be converted very precisely into the pivoting movement of the muzzle retaining arms, whereby these pivoting movements can occur virtually without slippage.The inverting mechanism according to the invention requires no components that need to be integrated into the glass forming machine station or installed below the mouth-holding arms on the station. This results in quick and easy installation options for the inverting mechanism according to the invention on glass forming machine stations. The power transmission path between the rotor element of the rotary motor on the one hand and the central shaft on the other is direct and therefore insensitive to dirt. Lubrication is not required.

[0005] In a particularly advantageous embodiment of the inverting mechanism according to the invention, the rotor element of the rotary motor is rigidly connected to a flange, which in turn is fixed to the central shaft of the inverting mechanism in a rotationally and axially fixed manner. This allows the drive energy generated by the rotary motor to be transferred almost directly to the central shaft.

[0006] According to an advantageous further development of the rotary motor of the drive device of the inverting mechanism according to the invention, this rotary motor is designed as a servo torque motor, preferably as an electric servo torque motor, in particular as an electric servo torque motor in standard design.

[0007] To give the inverting mechanism according to the invention a simple structure that can be assembled from individual modules, it is advantageous if each muzzle-holding arm is rigidly connected to a slide that is mounted on the central shaft in a rotationally fixed and axially displaceable manner. This significantly simplifies the replacement of defective components of the inverting mechanism.

[0008] A very precise and slip-free transmission of the rotational movement of the output element of the electric servo torque motor to the central shaft of the inverting mechanism, which acts as a pivoting element, is ensured if the power transmission path between the rotor element of the electric servo torque motor on the one hand and the muzzle retaining arms on the other hand is free of gears, gears, chains, belts and racks.

[0009] Advantageously, the central shaft of the inverting mechanism according to the invention is held at both its end sections in a side column of the inverting mechanism. The rotary motor can then be arranged within the side column, which contains the drive device, and is thus excellently protected against external influences.

[0010] Each slide of the inverting mechanism according to the invention is advantageously designed with a sliding sleeve that surrounds the central shaft of the drive device in a rotationally fixed connection and coaxially.

[0011] According to a further advantageous embodiment of the inverting mechanism according to the invention, each slide has a spring holder at its end section facing away from the other slide, in which a slide-side end of a spring acting in the axial direction of the central shaft is received. A spring received in this way on each slide and acting on that slide is suitable for achieving a preload of the slides in the axial direction of the central shaft in a structurally simple manner.

[0012] For this purpose, a spring end cap is expediently assigned to the spring holder of each slide, in which the end of the spring furthest from the slide is held and which is fixed to the central shaft in a rotationally and axially fixed manner. If the spring end cap facing the rotary motor is firmly connected to the rotor element of the rotary motor, the drive energy generated in the rotary motor can also be transferred to the central shaft of the inverting mechanism via this spring end cap with virtually no loss.

[0013] A rotary bearing, preferably a ball bearing, is advantageously arranged between the rotary motor and the central shaft of the drive device.

[0014] To limit the axial movement of the slides, it is advantageous to have a stop element on the outer circumferential surface of each spring end cap. The arrangement of the stop elements on the spring end caps is chosen such that when the stop position is reached, both slides are in the open position of the muzzle retaining arms.

[0015] To facilitate the adaptability of the inverting mechanism according to the invention to differently designed stations of glass forming machines, it is advantageous if the two slides of the inverting mechanism can be connected with end-holding arm inserts that together form one, two, three, four, or five end-holding rings. Naturally, different distances between the pre- and final molds provided at the respective station can also be taken into account in the design of the end-holding arm inserts.

[0016] The modular design of the inverting mechanism according to the invention, as described above, ensures that defective components can be replaced with significantly less effort compared to the prior art. This is also due to the fact that none of the components of the inverting mechanism according to the invention are installed in or under the station of a glass forming machine. Furthermore, the modular design of the inverting mechanism according to the invention allows for adaptations to different requirement profiles with comparatively little effort. The number of components of the inverting mechanism according to the invention is significantly reduced compared to the prior art. The number and spacing of the end-holding rings to be implemented on the end-holding arms can be adapted to any desired requirement profile with minimal effort.

[0017] If an encoder or incremental encoder is assigned to the electric servo torque motor of the inverting mechanism according to the invention, by means of which the exact angular position and the pivoting speed of the muzzle holding arms of the inverting mechanism can be detected during the entire pivoting movement of the muzzle holding arms, the data detected during such a pivoting movement can be checked for compliance with target and / or limit values.

[0018] When the encoder is connected to a control device of the glass forming machine, which regulates the pivoting movement of the inverting mechanism's end-holding arms, any necessary adjustments to the pivoting movement of the end-holding arms can be made based on the data acquired by the encoder. Furthermore, during operation of the inverting mechanism according to the invention, any desired angle of rotation between 0 and 180 degrees can be achieved with constant force. The pivoting movements of the end-holding arms can be adequately controlled, monitored, and stored for any given requirement profile.

[0019] The adjustment of the two slides and thus the muzzle retaining arms from their closed to their open position can be achieved with a comparatively low technical and design effort if radial steps of the central shaft and end walls of the slides associated with them can be pressurized with compressed air through bores formed in the central shaft in order to move the slides in the axial direction of the central shaft against the force of the springs towards the stops.

[0020] To ensure uniform movement of both slides in every case, it is advantageous if the central shaft is connected to a compressed air shaft at both ends.

[0021] In the inverting mechanism according to the invention, its rotatably mounted pivot axis is designed coaxially with the output element of a servo torque motor. Since there is a rigid connection between the rotor element of the servo torque motor on the one hand and the muzzle-holding arms of the inverting mechanism on the other, high mechanical strength can be achieved for the inverting mechanism, while the pivoting movements to be performed by the inverting mechanism can also be carried out with high precision. Because there is no play in the power transmission path between the rotor element of the servo torque motor, which is virtually integrally integrated into the inverting mechanism, and the muzzle-holding arms, high accuracy in the pivoting movement of the muzzle-holding arms can be achieved.

[0022] The inverting mechanism according to the invention is not very susceptible to impacts or collisions, since it contains no gears or other rigidly mounted components. Accordingly, this inverting mechanism can absorb such collisions due to its flexible mounting.

[0023] The invention will now be explained in more detail with reference to one embodiment and the drawing. The drawing shows: Fig. 1 a perspective front view of an embodiment of an inverting mechanism according to the invention for a glass forming machine; and Fig. 2 a vertical section view of the in Fig. 1 shown embodiment of the inverting mechanism according to the invention.

[0024] One in the Fig. 1 and Fig. 2. The inverting mechanism 1 according to the invention, illustrated by means of an embodiment, is part of a system otherwise described in the Fig. 1 and Fig. 2 glass forming or container glass machines not shown, in particular a so-called ISX glass forming machine.

[0025] In such glass forming machines, glass droplets are fed to individual stations of the machine. Each of these stations can contain multiple pre- and finished molds. The glass droplets are then fed into the molds located in the... Fig. 1 and Fig. 2 preforms not shown are fed to the corresponding station of the glass forming machine. In the case of the in Fig. In the embodiment of the inverting mechanism 1 shown in Figure 1, it is assigned to a station of the glass forming machine, which has three preforms. Therefore, the inverting mechanism 1 in the embodiment shown in Figure 1 has a position of three preforms. Fig. In the embodiment shown in 1, two muzzle retaining arms 2, 3 are formed, which in their Fig. In the approximate closed position shown in Figure 1, three opening retaining rings 4 are formed. Each opening retaining ring 4 is assigned to the opening area of ​​a cup produced in a preform. After production, the opening areas of the three cups are engaged by means of the opening retaining rings 4 of the two opening retaining arms 2, 3 of the inverting mechanism 1. Following the opening of the preforms, the cups are then transferred to the three finished molds of the respective station of the glass forming machine by a pivoting movement of the two opening retaining arms 2, 3 through 180 degrees. Depending on the number of preforms and finished molds at a station of a glass forming machine, the inverting mechanism 1 can be designed for a corresponding number of preforms and finished molds. Similarly, it is also possible to consider the mutual distances of preforms present at a station of a glass forming machine when designing the opening retaining arms 2, 3 of the inverting mechanism 1.This can be achieved using mouth-holding arm inserts that form the desired number of mouth-holding rings 4 at the desired distance from each other. Typically, a station of a corresponding glass forming machine has one to five pre-molds and finished molds.

[0026] The inverting mechanism 1 has, as can be seen from the Fig. 1 and Fig. As shown in Figure 2, two side columns 5, 6, in which the two end sections of a central shaft 7 of the inverting mechanism 1 are rotatably and axially fixedly mounted. The central shaft 7 has a larger diameter section on its middle section, which is located outside the two side columns 5, 6, to which smaller diameter sections adjoin on both sides. Between the larger diameter section and the two smaller diameter sections, the central shaft 7 has a radial step 8. A bore 9 runs through each of the two smaller diameter sections of the central shaft 7, branching in the area of ​​the corresponding radial step 8, with the branches opening in the radial annular surface of the central shaft 7 associated with the radial step 8. The two bores 9 are each connected to a compressed air source by means of a compressed air connection 10 and can thus be pressurized with compressed air.

[0027] From a synthesis of Fig. 1 and Fig. Figure 2 shows that the muzzle retaining arms 2, 3 are fixed to rotation and axially displaceable on the central area of ​​the central shaft 7 which has the larger diameter.

[0028] Each muzzle holding arm 2, 3 has a slide 11, 12 which is axially movable and rotationally fixed to the central shaft 7 by means of a sliding sleeve 13. In the Fig. 1 and Fig. In the closed position of the two muzzle retaining arms 2, 3 shown in Figure 2, the two slides 11, 12 rest against each other with their respective end faces. At its axial end section facing away from these end faces, each slide 11, 12 is provided with a spring retainer 14, which is rigidly connected to the push sleeve 13. The spring retainer 14 has an end wall 15, which is located in the Fig. 1 and Fig. In the closed position shown in Figure 2, the muzzle retaining arms 2, 3 rest against the radial step 8 of the central shaft 7. On its side facing away from the end wall 15, the spring holder 14 holds a slide-side end of a spring 16 acting in the axial direction of the central shaft 7. By means of the springs 16, the slides 11, 12 are moved into their positions in the Fig. 1 and Fig. The two spring holders are pre-tensioned in the abutting position shown in Figure 2, in which the muzzle retaining arms 2, 3 assume their closed position and in which the end walls 15 of the spring holders 14 bear against the radial steps 8 of the central shaft 7. The two spring holders 14 are axially displaceable on the two sections of the central shaft 7 with a smaller diameter.

[0029] The two springs 16 are held at their ends furthest from the slide in a spring end cap 17. The spring end cap 17 is mounted on the central shaft 7 in a rotationally and axially fixed manner. The spring 16 and the distance between the spring end cap 17 on the one hand and the radial step 8 of the central shaft 7 on the other are coordinated and dimensioned such that the spring 16 presses the associated spring retainer 14 of the slide 11 or 12 in the direction of the closed position of the muzzle retaining arms 2, 3. The outer diameter of the spring end cap 17 at its end section facing the spring retainer 14 is dimensioned such that, when the slide 11, 12 moves towards the spring end cap 17, the corresponding end section of the spring end cap 17 can be received within the spring retainer 14, which has a correspondingly dimensioned inner diameter.To limit the axial movement of the slide 11, 12, each spring end cap 17 is provided with a stop element 18 on its outer circumferential surface. An axial movement of the spring holders 14 in the direction of the side columns 5, 6 of the inverting mechanism 1 is limited by the respective stop element 18, since an end face of the spring holder 14 facing the stop element 18 comes into contact with this stop element 18.

[0030] As already mentioned, the spring end cap 17 is connected to the central shaft 7 in a rotationally and axially fixed manner. By means of the Fig. 1 and Fig. Drive energy can therefore be transferred to the central shaft 7 by means of the two spring end caps 17 arranged on the left, thus rotating the central shaft 7 and pivoting the muzzle retaining arms 2, 3 about the central axis of the central shaft 7. This drive energy is generated by a drive device 19 or by its motor unit 20. The drive device 19 is located in the Fig. 1 and Fig. The motor unit 20 is housed in the left side column 5 of the inverting mechanism 1. This motor unit 20 is designed as a rotary motor and, in the illustrated embodiment, as an electric servo torque motor 20. This electric servo torque motor 20 includes a stator element 25, which is fixedly mounted within the side column 5. Furthermore, the electric servo torque motor 20 includes a rotor element 21, which is rotatably mounted in the side column 5 of the inverting mechanism 1 by means of a rotary bearing designed as a ball bearing 22. The drive energy generated in the electric servo torque motor 20 is transmitted to the central shaft 7 as a rotational movement of the rotor element 21 without the interposition of any gears or similar means. For this purpose, the rotor element 21 is rotationally fixed to a flange 24, which in turn is rotationally and axially fixed on the central shaft 7.A rotational movement of the rotor element 21 of the electric servo torque motor 20 is thus converted almost directly into a rotational movement of the central shaft 7 and therefore into a pivoting movement of the muzzle retaining arms 2, 3. In the case of the... Fig. 1 and Fig. In the embodiment of the inverting mechanism 1 shown in section 2, the drive energy is transferred from the rotor element 21 of the electric servo torque motor 20 to the central shaft 7 both via the [unclear] in the Fig. 1 and Fig. 2 left-hand spring end cap 17 as well as via the flange 24, whereby the drive energy transmission is mainly realized via the flange 24.

[0031] The electric servo torque motor 20 is associated with an encoder or incremental encoder 23, which allows the precise current pivot position of the mouth-holding arms 2, 3 to be detected during the entire pivoting movement of the mouth-holding arms 2, 3 and / or the rotational movement of the central shaft 7, i.e., during both the inverting and reverting movements. Furthermore, the encoder or incremental encoder 23 also allows the rotational speed and angular position of the central shaft 7 to be measured and detected. These values ​​can be transmitted from the encoder or incremental encoder 23 to a control device of the glass forming machine (not shown in the figures). This control device then allows the movement sequence of the inverting mechanism 1, insofar as it relates to the rotation of the central shaft 7 and / or the pivoting movement of the mouth-holding arms 2, 3, to be controlled by a corresponding control of the drive device 19 and / or its electric servo torque motor 20.Accordingly, the movement sequence of the inverting mechanism 1 can be adapted to different designs or arrangements of preforms and finished forms at a station of a glass forming machine.

[0032] During the Fig. 1 and Fig. In the embodiment of the inverting mechanism 1 shown and explained above, standardized modular components can be used, in particular a standard-design electric servo torque motor 20.

[0033] To move the two muzzle retaining arms 2, 3 in the axial direction of the central shaft 7 to open the muzzle retaining rings 4, such that the slides 11, 12 of the muzzle retaining arms 2, 3 move away from each other, so that the muzzle retaining arms 2, 3 are removed from the position in the Fig. 1 and Fig. When the closed position shown in Figure 2 is moved to an open position, compressed air is introduced into the bores 9 through the compressed air connections 10, one of which is provided at each end of the central shaft 7. This compressed air acts on the end walls 15 of the spring retainers 14, which abut the radial steps 8, and thus move them axially against the force of the springs 16. This moves the slides 11, 12 apart, opening the muzzle retaining rings 4 of the muzzle retaining arms 2, 3. As soon as the compressed air supply through the compressed air connections 10 ends, the two springs 16 return the two spring retainers 14, and thus the slides 11, 12, to their original positions. Fig. 1 and Fig. 2 position shown, in which the mutually facing end faces of the slides 11, 12 are in contact with each other and accordingly the muzzle retaining rings 4 of the muzzle retaining arms 2, 3 are closed.

[0034] Naturally, the stop links 18 are attached to the spring end caps 17 in such a way that when the spring holders 14 are struck against the stop links 18, the muzzle retaining arms 2, 3 are in the open position.

[0035] Using the inverting mechanism 1 described above, glass tubes produced in the preforms can be gripped. After the preforms are opened, these glass tubes can then be moved by a pivoting movement of the mouth-holding arms 2, 3 by 180 degrees to the finishing molds of the respective station of the glass forming machine. After the finishing molds are closed, the mouth-holding arms 2, 3 are returned to their open position and then pivoted back to the preforms in a reversing movement, where they can then be returned to their closed position.

Claims

[1] Inverting mechanism for a glass forming machine comprising at least one preform, comprising two mouth-holding arms (2, 3) which are adjustable between a closed position holding an opening area of ​​a cup formed in the at least one preform and an open position releasing this opening area, a central shaft (7) to which the mouth-holding arms (2, 3) are rotationally fixed and about whose central axis the mouth-holding arms (2, 3) can be pivoted from a first pivot position associated with the at least one preform to a second pivot position associated with the at least one preform, and a drive device (19) with a motor unit (20) by means of which drive energy for pivoting the mouth-holding arms (2, 3) between their first and their second pivot position can be generated, characterized by, that the motor unit of the drive device (19) is designed as a rotary motor (20) with a stator element (25) and a rotor element (21), and that the rotor element (21) of the rotary motor (20) is axially and rotationally fixed to the central shaft (7) of the drive device (19) and the rotary motor (20) is arranged coaxially with respect to the central shaft (7) of the drive device (19). [2] Inverting mechanism according to claim 1, wherein the rotor element (21) of the rotary motor (20) is fixedly connected to a flange (24) which is fixedly and axially fixed on the central shaft (7) of the inverting mechanism (1). [3] Inverting mechanism according to claim 1 or 2, wherein the rotary motor of the drive device (19) is designed as a servo torque motor, preferably as an electric servo torque motor (20), in particular as an electric servo torque motor in standard design. [4] Inverting mechanism according to one of claims 1 to 3, wherein each muzzle holding arm (2, 3) is fixedly connected to a slide (11, 12) which is mounted on the central shaft (7) in a rotationally fixed and axially displaceable manner. [5] Inverting mechanism according to one of claims 1 to 4, wherein the power transmission path between the rotor element (21) of the rotary motor (20) on the one hand and the mouth holding arms (2, 3) on the other hand is gear-, gear-, chain-, belt- and rack-free. [6] Inverting mechanism according to one of claims 1 to 5, wherein the central shaft (7) is held at its two end sections in a side column (5, 6) of the inverting mechanism (1). [7] Inverting mechanism according to one of claims 4 to 6, wherein each slide (11, 12) has a push sleeve (13) surrounding the central shaft (7) of the drive device (19) in a rotationally fixed and coaxial manner. [8] Inverting mechanism according to one of claims 4 to 7, wherein each slide (11, 12) has a spring holder (14) at its end section facing away from the other slide (12, 11), in which a slide-side end of a spring (16) acting in the axial direction of the central shaft (7) is received. [9] Inverting mechanism according to claim 8, wherein a spring end cap (17) is associated with the spring holder (14) of each slide (11, 12), in which an end of the spring (16) furthest from the slide is held and which is fixed to the central shaft (7) in a rotationally and axially fixed manner. [10] Inverting mechanism according to claim 9, wherein the spring end cap (17) facing the rotary motor (20) is firmly connected to the rotor element (21) of the rotary motor (20). [11] Inverting mechanism according to one of claims 1 to 10, in which a rotary bearing, preferably a ball bearing, is arranged between the rotary motor (20) and the central shaft (7) of the drive device (19). [12] Inverting mechanism according to one of claims 1 to 11, in which a stop element (18) is formed on the outer circumferential surface of each spring end cap (17) by means of which the axial movement of the slide (11, 12) associated with the respective spring end cap (17) is limited. [13] Inverting mechanism according to one of claims 4 to 12, wherein the two slides (11, 12) can be connected to muzzle retaining arm inserts which together form one, two, three, four or five muzzle retaining rings (4). [14] Inverting mechanism according to one of claims 3 to 13, wherein an encoder (23) is associated with the electric servo torque motor (20), by means of which the exact angular position and the pivoting speed of the muzzle holding arms (2, 3) of the inverting mechanism (1) can be detected during the entire pivoting movement of the muzzle holding arms (2, 3). [15] Inverting mechanism according to claim 14, wherein the encoder (23) is connected to a control device of the glass forming machine, by means of which the pivoting movement of the mouth holding arms (2, 3) of the inverting mechanism (1) can be controlled. [16] Inverting mechanism according to one of claims 12 to 15, in which end walls (15) of the slides (11, 12) associated with radial steps (8) of the central shaft (7) can be pressurized with compressed air through bores (9) formed in the central shaft (7) in order to displace the slides (11, 12) in the axial direction of the central shaft (7) against the force of the springs (16) in the direction of the stop members (18). [17] Inverting mechanism according to claim 16, wherein the central shaft (7) is connected to a compressed air source at both ends.

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