MXPA99006968A

MXPA99006968A - Inverted cylinder mechanism for vid forming machine

Info

Publication number: MXPA99006968A
Application number: MXPA/A/1999/006968A
Authority: MX
Inventors: I Perry Jack
Original assignee: Owensbrockway Glass Container Inc
Priority date: 1998-07-31
Filing date: 1999-07-27
Publication date: 2000-10-01

Abstract

The present invention relates to an inverted cylinder mechanism for a glass container forming machine of the IS type, the inverted cylinder mechanism having a piston moving along a rectilinear path between internal and external positions within a housing ring to cause a rod of the cylinder attached to the piston to extend from an annular housing and then retract back towards the annular housing. A shock absorber or shock absorber is positioned within a cavity of the annular housing with its longitudinal central axis separated and extending parallel to the longitudinal central axis of the vari11a. The shock absorber or check absorber coupled by the piston when the piston reaches its external position to absorb inertial argas when the piston decelerates to stand in its external position. The cavity has an opening not aligned with the longitudinal center axis of the installed shock absorber, and the shock absorber can be removed through the opening along its longitudinal center axis after first rotating the shock absorber with respect to the longitudinal central axis of the varil

Description

INVERTED CYLINDER MECHANISM FOR GLASS FORMING MACHINE FIELD OF THE INVENTION This invention relates to an inverted cylinder mechanism for a glass container forming machine, of the individual section type (I.S.). More particularly, this invention relates to an improved shock absorber for the inverted cylinder mechanism. The invention also relates to a method for repairing or replacing a shock absorber of the inverted cylinder mechanism of the preceding character.

BACKGROUND OF THE INVENTION The modern practice for manufacturing glass containers, most of the containers are manufactured in an IS machine An IS machine, has a multiplicity of container forming sections side by side, typically six, eight, ten or up to twelve sections and the containers are formed in each of such sections from multiform masses of molten glass in two steps. In the first step, a preform of each container, which is often known as an unfinished part or parison, is formed by blowing or pressing, in an inverted position, that is, with the open end of the preform below its REF .: 30902 closed end. The portion that receives the container layer at its open end is molded by a neck mold assembly, which is often referred to as a neck ring assembly and is made of a separate pair of neck ring elements, and the body portion of the preform is formed by means of a mold assembly, which is made of a separable pair of mold elements which, when closed, collectively define an internal cavity with a shape corresponding to the desired shape of the mold. the preform. After completing the step of forming the unfinished part, the unfinished part and usually two, three or even four such unfinished pieces made simultaneously in each section of the machine, is transferred by a reversal operation of 180 ° to a second position, where each preform is blown in the final desired shape of the container within the cavity defined by the separable pair of mold elements. The transfer of the preform from the molding station of the unfinished part to the blow molding station is by means of an inverted arm assembly. The inverted arm assembly is made up of a pair of inverted arm sections side by side that oscillate in unison to transfer collar ring assemblies between the molding station of the unfinished part and the blow molding station, the transfer of The molding station of the unfinished part to the blow molding station is effective for transferring the unfinished parts and transporting them by the collar ring assemblies of the molding station of the unfinished part to the blow molding station . The inverted arm sections are capable of separating from each other in the blow molding station to allow the neck ring elements in the neck ring assemblies cut by them to be separated from each other, thereby enabling Unfinished parts are removed from the neck ring assemblies at the start of the blow molding step. The inverted arm mounting sections are then joined again when the inverted arm assembly returns to the molding station of the unfinished part to begin repeating the cycle. The reciprocating motion of each inverted arm assembly is usually driven by a pneumatic cylinder that drives a support in a rectilinear pattern, and a gear supported by an axle, to which the inverted arm mounting sections are secured, engages the support, which leads to the arcuate movement of the shaft as a result of the rectilinear movement of the support. The drive for an inverted arm assembly in a glass container forming machine I. S., in this way it is described generally in U.S. Patent No. 3,617,233 (Mumford), the description of which is incorporated herein by reference. Other US patents that describe inverted arm mechanisms include 3,445,218 (Trudeau), 3,573,027 (Nuzum, Sr) and 3,233,999 (Mumford), the descriptions of each of which are also incorporated herein by reference. The inverted movements of the drive cylinder of the inverted arm assembly and the support involve inertial loads of considerable magnitude at each end of the movement site, due to the considerable mass that must be rapidly decelerated at the end of each movement, and those loads are especially high when the inverted arm is moving from the molds of the unfinished part to the blown molds, because it is transporting parisons of glass vessels during this movement. Because of this, it has been necessary to know how to connect each cylinder, in parallel to an elongated shock absorber, so that the cessation of each movement is precise and without vibration. This is especially important in the case of a shock absorber used to dampen the deceleration of the inverted arm assembly in the blow molding station, because the glass vessel parisons are transported by the inverted arm assembly at this time and are subject to distortion under unduly high inertial loads. In any case, the useful life of each such shock absorber is so limited, due to the breakage and / or wear that they experience as a result of the magnitude and frequency of the shock loads, to which they are exposed during the normal operation of an IS machine, thus requiring the frequent removal of such shock absorbers to repair or replace them. Up to now, the removal and reassembly of a reverse motion shock absorber of the inverted arm assembly of the IS machine was a time-consuming procedure, since it requires the removal of the entire inverted arm mechanism, including disconnection and reconnection. Subsequent hydraulic lines that lead to it, and due to the limited work space available for maintenance personnel involved in such procedure. Typically a period of time of the order of 4-6 hours was required for such a procedure and, of course, no glass containers could be produced in that section of the machine during this time. The process was also somewhat unpleasant to perform, due to the high temperatures and noise inherently present in the environment of an I S. machine, in operation.

BRIEF DESCRIPTION OF THE INVENTION According to the present invention, a shock absorber or absorber of movement shocks is provided inverted arm assembly, improved, for a machine for forming glass vessels of type I.

S., and an improved method to remove and remount such shock absorber or shock absorber to repair or replace it. The shock absorber of the present invention rotates with respect to the housing of the inverted cylinder mechanism with which it is used to allow it to be removed without removing the inverted arm mechanism in which it is employed, and without completely removing it throughout its longitudinal central axis of the inverted cylinder mechanism assembly. In the method of the present invention, the inverted-motion shock absorber or absorber of the inverted cylinder mechanism is provided with a threaded connection at its exposed end, and can be removed by a removable device or accessory having an elongate member with an threaded end that is threadably engaged to the threaded connection of the inverted-motion shock absorber of the inverted cylinder mechanism. Accordingly, an object of the present invention is to provide an improved inverted cylinder mechanism for a glass container forming machine of the IS type. More particularly, an object of the present invention is to provide an inverted cylinder mechanism of the above type. with an inverted shock absorber that is easily removed for repair or replacement. It is also an object of the present invention to provide an improved method for removing the inverted-motion shock absorber from an inverted cylinder mechanism of an IS-type glass container forming machine. To better understand the present invention and the objects thereof. , attention is drawn to the drawings and the following brief description thereof, to the detailed description of the preferred embodiment, and to the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1A and IB collectively show a fragmented cross-sectional view of an inverted cylinder mechanism of a glass container forming machine according to the preferred embodiment of the present invention which is adapted to used according to the method of the present invention; Figure 2 is a fragmentary, cross-sectional elevation view of the inverted cylinder mechanism of Figure 1, but on a reduced scale, showing the step of removing an inverted movement shock absorbing element therefrom; Figure 3 is a fragmented view, similar to Figure 2, showing the last step in the removal of the inverted-motion shock absorbing element from the inverted cylinder mechanism assembly shown here; and Figure 4 is a fragmentary view similar to Figure 3, showing a further step in the removal of the inverted-motion shock absorbing element from the inverted cylinder mechanism assembly shown here.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Figure 1A illustrates the front end of an inverted cylinder mechanism for a glass container forming machine of the IS type, the inverted cylinder mechanism is generally identified by the reference numeral 10 in Figure 1 The inverted cylinder mechanism 10 is placed in an IS machine, with its longitudinal axis 12 extending longitudinally, and a forward end 14 of the inverted cylinder mechanism 10 is positioned at the upper end of the inverted cylinder mechanism 10 in such arrangement.

The inverted cylinder mechanism is made of a sleeve 16, contained within an annular housing 18, a rod 20, which is connected to one end of the rod of a pneumatic (or hydraulic) cylinder, which oscillates within the sleeve 16 due to the oscillation inside the cylinder. A series of engaging teeth 22 are cut into a front end of the rod 20 to form a toothed holder, and the gear teeth 22 project into an opening 24 of the annular housing 18 and the sleeve 16 to allow the teeth of the gear 22 fit into the teeth on a cylindrical gear with straight teeth (not shown) that is mounted on an axle (not shown) to which an inverted arm assembly is attached (also not shown) of the machine I. S., to thereby make the inverted arm assembly oscillate and move through and in an arc of 180 ° when the rod oscillates within the sleeve 16, as described above. The rod 20 is shown in the figures of the drawings in its innermost position inside the housing 18, and this position is the position that will place the inverted arm assembly aligned with the molds of the unfinished parts of an IS machine, in preparation for the arched movement of the inverted arm assembly, and the parisons cut by it, to the blow molding side of the machine to blow the parisons into containers. The longitudinal position of the rod 20 within the housing 18 is important to ensure that the inverted arm assembly cut by it, extends horizontally over the molds of the unfinished parts of the IS machine The inversion of the inverted arm assembly of a machine IS, having an inverted cylinder mechanism 10 is caused by the movement of the rod 20 from the position shown in Figures 1A and IB to a position beyond the front end 14 of the annular housing 18, and up to this point, the end Inner of the rod 20 is connected to a piston 26 that slides inside the annular housing 18, the piston is pneumatically or hydraulically driven by means, in other circumstances not shown. At the extension end of the rod 20, it is important that the movement stops smoothly to avoid imposing excessive inertial loads on the parisons transported by it. At this end, the inverted cylinder mechanism is provided with a shock absorber 28, the longitudinal central axis of which is spaced apart and extends parallel to the longitudinal central axis of the cylinder rod 20, and the shock absorber 28 is contained removably. inside an annular cavity 30 (Figures 3 and 4) of the annular housing 18. The shock absorber 28 has a rod or piston rod 32 which is positioned to contact the piston 26 at the front end of the stroke or segment of the rod 20, and serves to absorb the forward movement of the rod 20 by means of the transfer of hydraulic fluid into the shock absorber 28 in the known manner of a damper. In that regard, however, the hydraulic fluid within the shock absorber 28 is provided with an external source (not shown), typically a single source for all the inverted arm assemblies of an IS machine, given with control elements of appropriate flow to isolate the inverted arm assembly of a section of the given machine from those other sections of the same machine. The shock absorber 28 is normally retained in the cavity 30 by means of a fork of the end cap 34, with a generally C-shaped front end receiving a retaining bolt 36, which can be removed by removing it along its length. Longitudinal central axis. An alignment bolt 66 is provided to ensure proper circumferential orientation of the shock absorber 28 relative to the fork 34, when the proper circumferential orientation of the shock absorber 28 needs to properly align its hydraulic gates with those of the cavities 30. The position of the fork 34 along an axis extending parallel to the axis 12 is adjustable by means of a screw 38, whose inner end is in contact with an adjacent surface of the fork 34, the shock absorber 28 is elastically biased against the screw 38 by means of a spring 40 contained within a sleeve 42, which is contained within the interior of the cavity 30. The sleeve 42 limits the distance at which the shock absorber can be inserted into the cavity 30 and the spring 40 is positioned to engage an end 44 of the shock absorber 28, which is positioned to engage the spring 40 when the shock absorber 28 is in its installed position. The spring 40 serves to deflect outward the shock absorber 28 against the screw 48, whose longitudinal position is adjustable, so as to longitudinally position accurately the shock absorber 28 within the cavity 30. The shock absorber 28 is subjected to considerable wear in service due to the frequent impact loads that it must withstand and the shock absorber 28 must, therefore, be removed to be repaired or replaced from time to time during the useful life of the IS machine in which it is used. Such removal, and subsequent reassembly, of the shock absorber 28 or a replacement thereof can be effected rapidly by the method illustrated in Figures 2-4. According to this method, which can be and is preferably carried out without removing the inverted cup assembly of the converted cylinder mechanism 10, the retaining bolt 36 is removed, and then the fork of the end cap 34 is removed, the space between the bolt 36 and the adjacent surface of the fork of the end layer 34 is greater than the free, expanded length, the spring 40 to ensure that the spring 40 does not forcibly eject the shock absorber 28 from the cavity 30. A removable clamp 46, which is U-shaped facing upwards is then removably screwed to the annular housing 18, and then a hexagonal, elongated, dismantling nut 48 is placed on the dismounting clamp 46, with its central axis longitudinally aligned with the longitudinal central axis of the shock absorber 28. A threaded rod 50 is then inserted through a free end of the take-off nut 48 into a thread threaded into the piston 52 of the shock absorber 28, a clamping nut 54 is provided which is engageable by means of a wrench, if necessary, to prevent rotation of the piston 52 during tightening of the threaded rod 50. The removal nut 48 is then raised with respect to the annular housing 18 until the shock absorber 28 has an outermost end extending through an opening 56 at the end of the cavity 30. The removal nut 48 is then removed to along its longitudinal central axis. The shock absorber 28, or a replacement shock absorber, can be reinstalled in the cavity 30 by reversing this procedure. The initial movement of the shock absorber 28 during the removal is along its longitudinal axis, and very substantial loads are often required to effect such initial movement to overcome the frictional forces within the cavity. However, the very substantial mechanical advantage obtained by the use of a threaded rod 50 to effect its movement makes it possible to overcome such loads, and similar loads encountered in the installation of other such shock absorbers 28 within the cavity 30. As can be seen in FIG. shown in Figure IB, the housing 19 of the inverted cylinder mechanism 10 is also provided with a shock absorber 58 in a generally cup-shaped housing 62 at the opposite end 60 of the housing 18. The shock absorber 58 is positioned for to be coupled by the projection 64 at the end of a rod 66 which is concentrically positioned within the rod 20 when the piston 26 moves to the retracted position to dampen the deceleration of the piston 26 as it moves towards a stop. The service requirements for the shock absorber 58 are less severe than those for the shock absorber 28, because the inverted arm activated by the inverted cylinder mechanism does not carry anything soft, which operates at high temperature when the piston 26 moves towards the shock absorber or shock absorber 58. Although the best mode contemplated by the invention to carry out the present invention from the date of presentation thereof has been shown and described herein., it should be appreciated by those skilled in the art that modifications, variations and suitable equivalents thereof may be made without departing from the scope of the invention, such scope is limited only by the terms of the following claims and legal equivalents thereof.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims

CLAIMS Having described the invention as above, it is claimed as content property in the following claims. 1 In an inverted cylinder mechanism for a glass container forming machine of the individual section type, the inverted cylinder mechanism ~ has: an annular housing; a reversible, fluid-driven piston contained within the annular housing, the fluid-operated piston moves between the internal and external positions along a rectilinear path; a rod connected to the piston and moving with it; and ua arcartdguacbr or PT = '' '1 WI "P" of dxquss ccQocado ^ n a cavity of annular housing with separate longitudinal center axis and extending parallel to a longitudinal central axis of the rod, the shock absorber is placed to being coupled by the piston when the piston is close to the external position to absorb internal loads when the piston decelerates to a stop in the second position, the improvement is characterized in that; the cavity has an external alignment opening with a longitudinal central axis of the shock absorber or absorber in its installed position, and the absorber or absorber rotates with respect to the longitudinal central axis of the rod to be removed through the opening of the cavity by a movement that is parallel to the longitudinal central axis of the rod.
2. In an inverted cylinder mechanism to operate an inverted arm mechanism of the forming machine 10 glass vessels of the individual section type, the inverted cylinder mechanism has: an annular housing; a piston driven by a fluid, reversible, contained within the annular housing, a piston fluidly driven between the internal and external positions along a rectilinear path; a rod connected to the piston and moving with it; and ^ or one arrragaador or afcsorba like of colcca shocks ± i in a recess of the annular housing with its separate longitudinal center axis and extending parallel to a longitudinal central axis of the rod, the shock absorber is positioned to be engaged by a piston when the piston 25 is close to its external position to absorb inertial loading when it decelerates to a stop in the second position, the method of removing the shock absorber from the cavity is characterized in that it comprises: providing the cavity with an opening placed out of alignment with the longitudinal central axis of the shock absorber; removing the means for retaining the shock absorber in the cavity; coupling a front end of the shock absorber with elongate means extending parallel to the longitudinal axis of the shock absorber; raising the elongated means with respect to the longitudinal central axis of the rod to raise the front end of the shock absorber through the opening in the cavity; and then extract the shock absorber along its longitudinal axis.
The method according to claim 2, characterized in that the step of coupling a front end of the absorber or shock absorber that it includes; removably attach the removed clamp to the front end of the housing; insert a nut into the opening of the clamp; insert an elongated rod through the nut, the elongated rod has a threaded end; threaded inserting the threaded end of the elongated rod into a threaded opening at one end of the shock absorber.
4. The method according to claim 3, further comprising: providing a holding nut in alignment with the threaded opening of the end of the shock absorber to prevent the end of the shock absorber from rotating when the threaded end of the rod elongate is screwed into the threaded opening at the end of the shock absorber.
5. The method according to claim 2, characterized in that it comprises: extracting the shock absorber along its longitudinal axis a short distance before raising the elongated members. The method according to claim 5, characterized in that: the elongated means engage the front end of the shock absorber and are threadably coupled to the front end of the shock absorber, and where the extraction of the shock absorber as described in FIG. along its longitudinal axis is effected by rotating the elongated means to thereby prevent the translation of the elongated means along its longitudinal axis. The method according to claim 2, characterized in that the removal of the shock absorber from the cavity is carried out without removing the mechanism of the inverted arm of the glass container forming machine.