Patent Application
20120009048
The invention pertains to an apparatus according to the preamble of Claim 1.
The process of manufacturing hollow glass articles from the moulding of a glass gob in a blank mould and the finish mould up to the treatment in a cooling furnace is characterized by numerous transport and manipulation processes, wherein the attainable production yield depends on the speed and reliability of these processes. This applies, among other things, to the process of transferring articles that were removed from a finish mould and deposited on a stationary depositing plate onto a moving belt conveyor, on which the articles need to be positioned successively in the form of a row arrangement. Since such a belt conveyor in IS-machines (individual section) usually cooperates with a plurality of manufacturing stations, each of which is provided with a depositing plate, on which at least two finish-moulded articles need to be deposited in a cyclic fashion, the transfer onto the belt conveyor needs to be coordinated with the speed thereof, as well as the operating cycle of the manufacturing stations, in order to form a defined row on the belt.
Various types of transfer pushers are known as manipulation elements that directly cooperate with the hollow glass articles, wherein the ends of said transfer pushers that face the article feature pushing fingers that are in contact with the articles during the transfer process. The transfer process needs to be realized in such a way that it can be carried out quickly within a predetermined time interval. It is also necessary to prevent the article standing on the depositing plate from a toppling over and being damaged such that the article needs to stands on the belt conveyor in a defined position, namely a transfer point, at the end of the transfer curve and move with the same speed as the belt. Depending on the concrete realization of a transfer curve between a receiving point on the depositing plate and a transfer point on the belt conveyor, however, the article is subjected to accelerations in the radial and the tangential direction, wherein these accelerations need to be controlled in order to achieve an accurately positioned and undamaged transfer onto the belt conveyor, but said control becomes problematic and requires special safety measures at higher speeds.
EP 1 627 858 A1 discloses a transfer apparatus, in which a lever that can be pivoted about a vertical, stationarily arranged axis on one of its ends carries on its other end one end of a second lever such that it can also be pivoted about a vertical axis, wherein a transfer pusher that is equipped with three pushing fingers is supported on the other end of the second lever such that it can be pivoted about a horizontal axis. The rotations of the first lever about the stationary axis, of the second lever relative to the first lever and of the transfer pusher relative to the second lever are realized with drives that can be controlled independently of one another such that a transfer curve from a receiving point on a depositing plate up to a transfer point can be realized in the form of a superposition of three partial movements. At least two of the rotary drives required for realizing these three partial movements are arranged stationarily.
DE 10 2004 010 238 B3 discloses another transfer apparatus, in which the transfer movement of a transfer pusher carrying pushing fingers between a depositing plate and a moving belt conveyor is realized in the form of three rotational movement that can be controlled independently of one another and the superposition of which results in a transfer curve that extends from a receiving point on the depositing plate to a contact point tangentially to the moving direction of the belt conveyor and continues with the same speed and direction as the movement of the belt conveyor by a defined linear path element after this contact point until a separation point is reached, at which the pushing fingers are disengaged. This measure serves for additionally securing the position of the hollow glass articles during the transfer. However, these transfer apparatuses that are characterized by three axes to be controlled are comparatively complex with respect to the control technology, and, in particular their constructive design because three stationarily arranged rotary drives are required.
In addition, GB 2 435 025 A discloses another comparable apparatus, in which the transfer curve of a transfer pusher between a depositing plate and a moving belt conveyor is realized in the form of a superposition of the rotational movements generated by two stationarily arranged rotary drives. A similar apparatus, in which the transfer curve is realized in the form of the superposition of the rotational movements of two stationary rotary drives, is also described in U.S. Pat. No. 4,414,758 A.
Due to a reduction of the number of rotary drives to be used and controlled, the apparatuses disclosed in documents GB 2 435 025 A and U.S. Pat. No. 4,414,758 A provide certain advantages in comparison with the initially cited state of the art that is characterized by three rotary drives. However, their design is also comparatively complex due to the construction that requires numerous transmission elements between the transfer pusher and the rotary drives.
It is the objective of the invention to design an apparatus of the initially described type that additionally simplifies the realization of a secure positioning of hollow glass articles on the belt conveyor with low constructive expenditures. In such an apparatus, this objective is attained with the characteristics disclosed in the characterizing portion of Claim 1.
The inventive drive system comprises only two axes to be controlled and accordingly is provided with only two rotary drives for generating rotational movements such that a transfer curve is realized in the form of a superposition of these two rotational movements. The objective of this transfer curve always consists of allowing an undamaged transfer of the articles onto the belt conveyor, namely within a defined time interval, such that a row of these article is formed on the belt conveyor. It was determined that such a drive system makes it possible to realize a transfer curve, as well as a transfer movement, that allows a safe transfer of the articles at high speeds in accordance with reproducible transfer points on the belt conveyor and therefore with one less axis to be controlled.
A rotary table is provided and functionally connected to the second rotary drive provided for realizing a second rotational movement. It is important that the first rotary drive provided for generating the first rotational movement is connected to the rotary table. Consequently, the second rotational movement that results from the rotation of the rotary plate and manifests itself in the form of a movement of the shaft carrying the transfer pusher about the axis of the rotary plate is superimposed with the rotational movement about the axis of this shaft.
According to the characteristics of Claim 2, the rotary drive that generates the first rotational movement is situated underneath the rotary plate such that a space-saving design can be achieved.
According to the characteristics of Claim 3, the apparatus is characterized by a console that serves for being mounted on the machine frame of an IS glass moulding machine.
The characteristics of Claims 4 and 5 pertain to a first variation of the invention, in which the rotary plate is supported on a vertical hollow shaft that is connected thereto and in turn supported by a stationary vertical axle. This axle transmits bearing forces to the console, on which the entire apparatus is factually supported.
The characteristics of Claims 6 to 9 pertain to a second variation of the invention, in which the underside of the rotary plate is supported on a hollow shaft that is connected thereto and in turn supported on a stationary bell-shaped bearing. The bell-shaped bearing transmits bearing forces to the console, on which the entire apparatus is also factually supported in this case.
According to the characteristics of Claims 10 and 11, the second rotary drive may be mounted on the hollow shaft in the aforementioned first variation and functionally connected to the stationary axle. It is always arranged underneath the rotary plate such that a particularly space-saving overall design can be achieved.
According to the characteristics of Claim 12, a housing is provided, in which nearly all components of the drive system are accommodated. The housing provides mechanical and thermal protection for the aforementioned components and makes it possible, in particular, to achieve a space-saving design of the apparatus by arranging both rotary drives within this housing. Both rotary drives are arranged underneath the rotary plate.
With respect to the least possible mechanical stress on the articles during the pushing movement, it is particularly advantageous if, according to the characteristics of Claim 13, the transfer curve, as well as the transfer movement, is realized such that a changing curvature such as, for example, an exponential curve or a curve approximated thereto results along the curve, wherein the pushing fingers move at least approximately tangential to the transport direction of the belt conveyor and with the same speed as the belt conveyor in the transfer point, in which the pushing fingers disengage from the articles. This can be achieved by adapting the rotational movements generated by the two rotary drives accordingly.
The invention is described in greater detail below with reference to exemplary embodiments that are schematically illustrated in the drawings. In these drawings:
In
The rotary plate 6 is rigidly connected to a bearing flange 7, in which a shaft 10 is supported by means of rolling bearings 8, 9, wherein the upper end of said shaft is rigidly connected to one end of a horizontally extending transfer pusher 11, the other end of which is conventionally equipped with an arrangement of pushing fingers 12. The pushing fingers 12 of this arrangement are designed for directly contacting the hollow glass articles to be moved from a depositing plate onto a belt conveyor.
The reference symbol 13 identifies a first electric rotary drive such as, e.g., a servomotor that is arranged stationarily relative to the bearing flange 7 underneath the rotary plate 6, wherein the output shaft of this first electric rotary drive is functionally connected to the shaft 10. This first rotary drive 13 serves for generating a first rotational movement, namely the rotation of the transfer pusher 11 about the axis of the shaft 10 and therefore relative to the rotary plate 6.
The reference symbol 14 identifies a console that is mounted on the hollow shaft 5 and supports a second electric rotary drive 15 such as, e.g., a servomotor underneath the rotary plate 6, wherein the output shaft of this second electric rotary drive that extends parallel to the axle 2 is functionally connected to the stationary axle 2 by means of a traction mechanism such as, e.g., a belt drive 16.
The belt drive 16 consists of a first pulley 17 that is rotationally connected to the output shaft of the second rotary drive 15 and a second pulley 18 that is rigidly connected to the axle 2 such that a rotation of the rotary plate 6 about the axle 2 can be realized by means of the rotary drive 15.
One can ascertain that the absolute movement of the transfer pusher 11 and therefore the pushing fingers 12 results from a superposition of two rotational movements, namely a rotation of the rotary plate 6 about the axle 2 and a rotation of the transfer pusher 11 about the axis of the shaft 10.
One can furthermore ascertain that the mountings of both rotary drives 13, 15 are arranged movably, i.e., subjected to the rotational movement of the rotary plate 6, in this first variation of the inventive apparatus.
The reference symbol 19 identifies a conventional bore that is intended for conveying sealing air and centrally extends through the axle 2.
All drive components of the rotary plate 6, as well as of the transfer pusher 11, are situated within a graphically indicated housing 20, from the upper side of which protrudes the upper end of the shaft 10 that carries the transfer pusher 11.
Functional elements that are illustrated in
In the second variation of the inventive apparatus illustrated in
A hollow shaft 22 is supported on the bell-shaped bearing 24 by means of rolling bearings 3, 4, wherein the upper end of said hollow shaft is rigidly connected to a rotary plate 6. In contrast to the exemplary embodiment according to
The movement of the transfer pusher 11 is a movement that is composed of a rotation about the stationary axis of the shaft 23 and a rotation about the axis of the shaft 10 that moves with the rotary plate 6, wherein the concrete shape of a transfer curve 29, as well as the movement along this curve between a receiving point 31 on the depositing plate 12 and a transfer point 30 on the moving belt conveyor 26, can be realized in such a way by controlling the two rotary drives 13, 15′ that the movement of the pushing fingers 12 and therefore of the hollow glass article 32 to be moved takes place at least approximately tangential to the direction 25 and with the same speed as the belt conveyor 26 in the transfer point 30.
In this way, the hollow glass articles 32 are prevented from being damaged and from toppling over during the transfer and a uniform row 33 consisting of these hollow glass articles can be formed on the belt conveyor 26, namely on the basis of a space-saving drive system with a relatively simple constructive design.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2008 027 911.0 | Jun 2008 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/003985 | 6/4/2009 | WO | 00 | 5/24/2011 |
