阅读说明：本技术 卷轴传送轨道系统和在其上传送卷轴的方法 (Reel transport rail system and method for transporting reels thereon ) 是由 亚科·哈帕宁 于 2020-02-17 设计创作，主要内容包括：本发明涉及卷轴传送轨道系统,包括两个平行的、大体水平的或在主传送方向上略微向下游倾斜的传送轨道(15),用于支撑卷轴(20)的每个支撑端部(25)。卷轴传送轨道系统(10)包括布置在每个传送轨道(15)上的至少部分加压的软管装置(17),用于移动和停止待传送的卷轴(20)的移动。还涉及在卷轴传送轨道系统上传送卷轴的方法,卷轴(20)在用于支撑卷轴(20)的每个支撑端部(25)的两条平行的、大体水平的或在主传送方向上略微向下游倾斜的传送轨道(15)上被传送。卷轴(20)在卷轴传送轨道系统(10)中通过移动和停止待传送卷轴(20)被传送,该系统包括布置在每个传送轨道上的至少部分加压的软管装置(17)。(The invention relates to a reel transport rail system comprising two parallel, substantially horizontal or slightly downstream inclined transport rails (15) in the main transport direction for supporting each support end (25) of a reel (20). The reel transfer rail system (10) comprises an at least partly pressurized hose arrangement (17) arranged on each transfer rail (15) for moving and stopping the movement of the reels (20) to be transferred. It also relates to a method of transferring reels on a reel transfer rail system, the reels (20) being transferred on two parallel, substantially horizontal or slightly downstream inclined transfer rails (15) in a main transfer direction for supporting each support end (25) of the reels (20). The reels (20) are transported in a reel transport rail system (10) by moving and stopping the reels (20) to be transported, which system comprises at least partly pressurized hose means (17) arranged on each transport rail.)

1. A reel transfer rail system comprising two parallel, substantially horizontal or slightly downstream inclined transfer rails (15) in the main transfer direction for supporting each support end (25) of a reel (20), characterized in that the reel transfer rail system (10) comprises an at least partly pressurized hose arrangement (17) arranged on each of the transfer rails (15) for moving a reel (20) to be transferred and stopping the movement of the reel to be transferred.

2. Reel transfer rail system according to claim 1, characterized in that the reel transfer rail system (10) comprises a pressure system (40) connected to the at least partly pressurized hose arrangement (17) for adjusting the pressure and/or flow of a pressure medium inside the at least partly pressurized hose arrangement (17) for moving and stopping the reel (20) to be transferred.

3. Reel transfer rail system according to claim 1 or 2, characterized in that the at least partially pressurized hose arrangement (17) on each transfer rail (15) is positioned in contact with a support end (25) of the reel (20).

4. Reel transfer rail system according to any of claims 1-3, characterized in that the reel transfer rail system (10) further comprises a guide on each transfer rail (15) for positioning the respective support end (25) of the reel (20) on the respective transfer rail (15).

5. Reel transfer rail system according to any of claims 1-4, characterized in that the at least partially pressurized hose arrangement (17) is formed by several extensions spaced apart in the main transfer direction of the at least partially pressurized hose arrangement (17).

6. Reel transfer rail system according to claim 5, characterized in that one part of the at least partially pressurized hose arrangement (17) extends over at least two stop stations of the reel (20) on the transfer rail (15).

7. Reel transfer rail system according to claim 5 or 6, characterized in that a plurality of sections of the at least partially pressurized hose arrangement (17) are alternately arranged on each transfer rail (15) such that one section of the at least partially pressurized hose arrangement (17) now supports the support end (25) of the reel (20).

8. Reel transfer rail system according to any of claims 1-7, characterized in that the reel transfer rail system (10) further comprises a position measurement system (30) with a position sensor (31), which is connected with the pressure system (40) to measure and control the position of the reel (20) on the transfer rail (15).

9. Reel transfer rail system according to any of claims 1-8, characterized in that the distance between the support surfaces (27) of the support ends (25) of the transfer rail (15) is adjustable.

10. A method of transporting reels on a reel transport rail system, in which method the reels (20) are transported on two parallel, substantially horizontal or slightly downstream inclined in the main transport direction transport rails (15) for supporting each support end (25) of a reel (20), characterized in that, in the method, the reels (20) are transported in the reel transport rail system (10) by moving and stopping the reels (20) to be transported, which reel transport rail system comprises at least partly pressurized hose means arranged on each of the transport rails (15).

11. Method according to claim 10, characterized in that in the method the reel (20) to be conveyed is moved and stopped by regulating the pressure and/or flow of the pressure medium in the at least partly pressurized hose arrangement (17) by controlling a pressure system (40) connected to the at least partly pressurized hose arrangement (17).

12. A method according to claim 10 or 11, characterized in that, in the method, the conveying movement of the reel (20) is provided by increasing the pressure in the pressurized hose arrangement (17) on the upstream side of the reel (20) and generating no pressure or a lower pressure in the at least partially pressurized hose arrangement (17) on the other downstream side of the at least partially pressurized hose arrangement (17) than on the upstream side of the reel (20).

13. A method according to any one of claims 10-12, c h a ra cte ri sed in that, in the method, the stopping of the conveying movement of the reel (20) is provided by controlling the pressure in the at least partly pressurized hose arrangement (17) at each side of the reel (20) to substantially the same level.

Technical Field

The present invention relates to a spool transfer rail system and to a method of transferring spools on a spool transfer rail system.

Background

As is known from the prior art, in a fiber web production process, typically comprises an assembly formed by a number of devices arranged in series on a process line. A typical production and processing line comprises a headbox, a wire section and a press section, followed by a dryer section and a winder. The production and treatment line may further comprise other sections and equipment for finishing the fibrous web, such as size press, coating equipment, calender. The production and handling line typically also includes at least one slitter-winder (slitter-winder) for forming customer rolls and roll wrapping apparatus. And as is known, fibrous webs, such as paper or paperboard webs, are manufactured in fibrous web manufacturing lines formed by a plurality of machines together, which may be several hundred meters long.

In a fiber web manufacturing line, the manufacturing operation is a continuous process. The finished fibre web output from the machine is wound by a reel-up around a reel spool (i.e. reel spool) into a parent roll (machine reel), which may be more than 5 meters in diameter and may weigh more than 160 tons. The purpose of the winding is to convert the fiber web from its planar manufactured form into a form that can be handled more easily. A reel-up is thus a device for winding material, which is produced as a continuous fiber web in the production line in the form of rolls; and (5) mother rolls. In the production process of fiber webs, winding is usually the first process part, wherein a continuous process is sequential from discontinuous to continuous. The parent rolls are formed around a reel spool which serves as the core for winding, i.e. the fibre web on one parent roll around one reel spool has a starting point and an end point. The reel-up may be followed by a transfer track on which one or more parent rolls wound around the reel spool are at least temporarily stored before being transferred to the next stage of fiber web production and processing.

The web of the parent roll produced in the manufacturing process is full-width and even more than 100km long, and therefore before being sent from the factory it must be cut into partial webs of suitable width and length for the customer and then wound around cores into "customer rolls". It is known that such slitting and winding of the web takes place in a separate machine adapted to the purpose, i.e. a slitter-winder. In slitter-winders, a parent roll is unwound from a reel in an unwinding station and a wide web is slit by slitting sections into a plurality of narrower partial webs which are wound by winding sections around winding spools, such as cores, into customer rolls. When the customer rolls are completed, the slitter-winder stops and the rolls or "packs" are removed from the machine. Thereafter, the process will continue to wind a new group. These phases are repeated periodically until the fibre web on the parent roll is exhausted from the reel spool, at which point the parent roll is replaced and operation is resumed with unwinding of a new parent roll from the reel spool. In a fiber web production line, the unwinding station is also positioned in connection with, for example, an off-line finishing station, typically a coating station or a calender station.

In the unwinding station of the known fiber web production line, the parent rolls are usually delivered to an unwinding station which is not connected to the paper machine with the transfer rail by a crane and is not lowered to the transfer rail. In applications where the unwinding station is connected to a production line with an in-line transfer track, the parent rolls are transferred along the transfer track from the reel-up to the unwinding station. The transfer track for a full parent roll consists of a horizontal or inclined track with a standby station. Along the transfer track, the parent roll is transferred from one standby station to another until reaching the unwinding station. For horizontal transfer tracks, the parent roll is transferred from one standby station to another by means of a transfer device, whereas for inclined transfer tracks, the parent roll is transferred from one standby station to another by means of gravity-based rolling and stop and release mechanisms.

Usually, the reels emptied as a result of unwinding are removed from the unwinding station by manual lifting with a crane or automatically by a reel handling device. The unwinding station may be followed by a transfer track on which one or more empty or nearly empty reels are temporarily stored before being transferred to the next stage, e.g. to a storage or a coiler. The reel handling device may comprise a vertical lifting device or rotatable lifting arm for the empty reel and a return conveyor track, which is positioned above the conveyor track for the parent reel, typically also above the unwinding station or above the slitter-winder. The empty or nearly empty reel is lifted with a lifting device or with a lifting arm to a return conveyor track, which usually has a number of return positions. The reel store is typically positioned above the unwind station. Along the return conveyor track, the reels are transferred from one station to another using a stop and release mechanism by means of a conveyor device or by means of gravity-based rolling. In some cases, the empty reel can be removed from the return conveyor track by lowering the device and moved to the coiler of the machine by a crane or a conveyor trolley. The return transfer rail can also be connected directly to the reel storage rail of the reel-up, so that the reel can be transferred directly from the unwinding station to the reel-up.

In order to ensure a smooth continuity of the production and handling of the fibre web, storage space for the complete parent rolls, the partly filled parent rolls and the empty reeling shafts is required. It is known that such a storage space at the finishing end of a fiber web manufacturing line is positioned in the main machine line between the main equipment of the manufacturing process on the transfer track. Furthermore, the reject location (rejecting location) in the pulper for a partially filled parent roll or the bottom end of a parent roll needs to be associated with the arrangement in which the parent roll is handled, and the reel spool may be arranged on the transfer track.

As is evident from the above, in fiber web production and handling lines, various transfer tracks can be used for the reels, whether or not the fiber web is wound on the reels. Typically, the transfer rail system for the reels consists of a horizontal or inclined rail with a standby station and with means to stop the reel at the desired station. The inclined tracks are typically inclined only slightly in the downstream direction of transport, i.e. a downhill inclination of about 0.1-0.5 degrees. Each system has two parallel rails, one end of the reel being supported on one rail and the other end of the reel being supported on the other rail. In the known transport track system, there may also be a door transport track which is connected to the transport track at each end of the door transport track and is openable, if necessary, for example to move a reel to or from the transport track from a transport trolley, for example for a reel.

In the known transfer rail system the station for stopping the reel has been fixed due to the required stopping means.

Furthermore, there is sometimes the possibility of a collision effect in case too many reels are simultaneously on the conveying track or stop not functioning properly. Especially in the case of parent rolls, this domino effect is extremely dangerous due to the size and weight of the parent roll.

Furthermore, in certain types of known transport track systems, for example transport track systems having an inclined transport track but no carrying arrangement for transporting the reel, the direction of movement of the reel is already fixed, because this configuration does not allow a backward movement.

Therefore, the known transfer rail system requires many equipment, such as actuators, energy transfer devices, means to stop the reel to the desired station.

Disclosure of Invention

The object of the present invention is to create a new transfer rail system for transferring reels and a new method of transferring reels on a reel transfer rail system to enable a simple, flexible and cost-effective transfer of parent reels and reels on a transfer rail in connection with the production of a fiber web.

It is an object of the invention to further develop the reel transfer rail system and the method of transferring reels on a reel transfer rail system, wherein the reels move on a substantially horizontal or slightly inclined rail.

It is an object of the present invention to create a reel transport rail system and a method of transporting reels on a reel transport rail system, wherein the disadvantages and problems of the systems and methods known from the prior art are eliminated or at least minimized.

To achieve the above objects and those that will become apparent hereinafter, a reel transfer rail system and a method of transferring reels on a reel transfer rail system according to the present invention are provided.

In the present description and claims, a reel spool refers to a reel spool with or without fibre web thereon, i.e. a parent roll, a tail roll (reject roll), a nearly empty reel and an empty reel. Furthermore, the term "transport track" is to be understood as a transport track on which the reels move, i.e. also a part of the transport track extending over e.g. the doors of the transport track, and the transport track may be formed as a one-piece extending transport track or as a transport track formed from more than one piece.

According to the invention, a spool transfer rail system comprises: two parallel, substantially horizontal or slightly downstream inclined conveying tracks in the main conveying direction for supporting each supporting end of the reel; and at least partially pressurized hose means arranged on each transfer track for moving the reel to be transferred and stopping the movement of the reel to be transferred.

According to an advantageous feature of the invention, the reel transport rail system further comprises a pressure system connected to said at least partially pressurized hose arrangement for adjusting the pressure and/or flow rate of the pressure medium inside said at least partially pressurized hose arrangement for moving and stopping the reel to be transported.

According to an advantageous feature of the invention, said at least partially pressurized hose means on each transfer track is positioned in contact with the supporting end of the reel.

According to an advantageous feature of the invention, the reel transfer rail system further comprises a guide on each transfer rail to position the respective supporting end of the reel on the respective transfer rail.

According to an advantageous feature of the invention, the at least partially pressurized hose arrangement is formed by several extensions of the at least partially pressurized hose arrangement spaced apart in the main conveying direction.

According to an advantageous feature of the invention, a portion of the at least partially pressurized hose arrangement extends over at least two stop stations of the reel on the conveying track.

According to an advantageous feature of the invention, the portions of the at least partially pressurized hose arrangement are alternately arranged on each transfer track such that one portion of the at least partially pressurized hose arrangement supports the support end of the reel at this time.

According to an advantageous feature of the invention, the reel transport rail system further comprises a position measuring system with a position sensor connected to the pressure system for measuring and controlling the position of the reel on the transport rail.

According to an advantageous feature of the invention, the distance between the support surfaces of the support ends of the transfer track is adjustable in order to provide a desired compression pressure to the at least partially pressurized hose arrangement to prevent a release of pressure from below the support ends of the reels. According to the invention, in a method of transferring reels on a reel transport rail system, the reels are transferred on two parallel, substantially horizontal or slightly downstream inclined in the main transfer direction, transport rails for supporting each supporting end of a reel, and the reels are transferred in the reel transport rail system by moving and stopping the reels to be transferred, which system comprises an at least partly pressurized hose arrangement arranged on each transport rail.

According to an advantageous feature of the invention, in the method the reel to be transported is moved and stopped by regulating the pressure and/or flow of the pressure medium in the at least partially pressurized hose arrangement by controlling a pressure system connected to the at least partially pressurized hose arrangement.

According to an advantageous feature of the invention, in the method the conveying movement of the reel is provided by increasing the pressure in said pressurized hose arrangement on the upstream side of the reel and generating no pressure or a lower pressure in said at least partially pressurized hose arrangement on the other downstream side of said at least partially pressurized hose arrangement than on the upstream side of the reel.

According to an advantageous feature of the invention, in the method, the stopping of the transfer movement of the reel is provided by controlling the side pressure in the at least partly pressurized hose arrangement at each side of the reel to substantially the same level. The pressure on the side of the at least partially pressurized hose arrangement that is prevented from moving is closed until a determined pressure is reached and the movement of the reel is stopped. The pressure is maintained at a determined level, for example, by controlling the pressure and/or flow of the pressure medium in the at least partially pressurized hose arrangement by means of a pressure system, for example by means of a pressure relief valve connected to the pressure system.

According to the invention and its advantageous features, in connection with the reel transfer rail system and the method of transferring reels on the reel transfer rail system, the transfer of the reels on the transfer rail is done by means of said at least partially pressurized hose arrangement positioned in an exact position on the transfer rail, which is advantageously located between the precisely machined support surface of the transfer rail and the precisely machined support portion of the end of the reel (more advantageously the bearing housing at the end of the reel). Thus, by adjusting the position of the at least partially pressurized hose relative to the reel, the compression of the at least partially pressurized hose arrangement can be accurately controlled and adjusted. The compression is to ensure that the pressure medium does not leak under the reel. The transfer rail system thus comprises said at least partially pressurized hose arrangement, which may be continuous or made of consecutive parts of the hose arrangement, which consecutive parts may be directly consecutive one after the other or spaced one after the other in the longitudinal direction of the transfer rail and correspondingly on the other rail. Advantageously, one at least partially pressurized hose means covers at least two stop stations adjacent to each other. The at least partially pressurized hose arrangement is advantageously pressurized by a fluid, for example by a gas (advantageously pressurized air) or by a liquid (advantageously water). By pressurizing the at least partially pressurized hose means with a liquid, a higher pressure can be used.

In the transfer of the reels along the transfer rails it is very important to synchronize the movement of the ends of the reels along each transfer rail, which can be easily and accurately achieved by throttling the pressurized fluid.

By means of the invention and its advantageous features, a number of advantages are achieved, for example a very simple and lightweight construction of the conveyor track system, since neither moving actuators nor energy conveying devices etc. are required. The moving reel can be stopped at any desired position and thus stop stations can be formed at desired intervals according to the needs at the time. The disadvantages of the domino effect in the known system can be prevented by the at least partly pressurized hose arrangement preventing undesired movements and by the throttle control preventing movements caused by external forces. The direction of movement of the reel on the reel transport track, controlled by the pressurized hose, can be forward and backward based on the main transport direction along the reel transport track. The reel transport rail system also offers the possibility of several reels moving simultaneously, so that only a low speed is required in order to complete the desired movement of the reels in the desired time, which means increased safety.

Drawings

The invention is described in detail below with reference to the attached drawing, wherein

An advantageous example of a reel transport rail system according to the invention is schematically shown in figure 1 in a partial three-dimensional view,

an example of a reel transport rail system according to fig. 1 is schematically shown in a side view in fig. 2, an

Detailed views of the end of a reel on the transport rail system according to the example of fig. 1 and 2 are schematically shown in fig. 3A-3B.

Reference signs used in the figures:

10-reel transfer rail system

11 frame

15 transfer rail

16 guide piece

17 hose assembly

18 support surface of a transfer rail

20 reel

21 mother roll

25 support end of reel

26 guide groove of reel

27 bearing surface of the reel

30 position measurement system

31 position sensor

40 pressure system

Detailed Description

In the course of the following description with respect to fig. 1-3B, like numerals and signs will be used to identify like elements, in accordance with the different views illustrating the invention and its advantageous examples. In the drawings, some repetitive reference numerals have been omitted for clarity.

A schematic example of a spool transfer rail system 10 is shown in fig. 1. The reel transport rail system 10 is built on a frame 11. The frame 11 supports the reel 20 at each end of the reel 20. Only one end of the reel 20 and only one side of the reel track system are shown in fig. 1, but it should be understood that the corresponding arrangement is located at the other end of the reel 20, and thus the reel transfer track system 10 comprises corresponding elements, structures, etc. at each end of the reel 20, i.e. at each side of the transfer track system 10. The transfer rail 15 is positioned on the frame and the support end 25 of the reel 20 is positioned on the transfer rail. The transfer track 15 comprises a guide 16 for guiding the direction of movement of the reel 20 and an at least partly pressurized hose arrangement 17 supporting a supporting end 25 of the reel 20. By controlling the pressure and/or flow of the pressure medium in the at least partly pressurized hose arrangement 17, the reel 20 can be moved along the conveyor track 15 and stopped at a desired position. In the example of fig. 1, the reel spool 20 has a fiber web around it, i.e. a parent roll 21 is formed around the reel spool 20. Said at least partially pressurized hose arrangements 17 are connected to a pressure system for creating and controlling the pressure and/or flow of pressure medium, pressure fluid inside said at least partially pressurized hose arrangements 17, and said at least partially pressurized hose arrangements 17 positioned on each side of the reel transport rail system are at least controllably connected to each other for synchronizing the movement of each support end 25 of the reel 20.

A schematic example of the spool transfer rail system 10 of fig. 1 is shown in side view in fig. 2. The transfer rail 15 extends over a certain length and is supported by a frame 11, which in this example is formed by several frame parts, advantageously of concrete. In addition, only one end of the spool 20 is shown in fig. 2, and it should be understood that a corresponding arrangement is positioned at the other end of the spool 20. The support end 25 of the reel 20 is positioned on the transfer rail 15. The transfer rail 15 comprises a guide 16 extending continuously along the transfer rail 15 for guiding the direction of movement of the reel 20 and an at least partly pressurized hose arrangement 17 for supporting the support end 25 of the reel 20. In this example, the pressurized hose arrangement 17 is formed by several extensions of the at least partially pressurized hose arrangement 17 spaced apart in the main direction. Advantageously, as shown in fig. 2, one portion of said at least partially pressurized hose means 17 covers at least two stop stations adjacent to each other. The sections of the at least partially pressurized hose means 17 may be alternately arranged on each transfer track 15 such that the one section of the at least partially pressurized hose means 17 now supports the supporting end 25 of the reel 20. The at least partly pressurized hose means may also extend as one piece along the transfer track 15. By controlling the pressure and/or flow of the pressure medium in the at least partly pressurized hose arrangement 17, the reel spool 20 can be moved along the conveyor track 15 and stopped at a desired position. In the example of fig. 1, the reel spool 20 has a fiber web around it, i.e. a parent roll 21 is formed around the reel spool 20. Said at least partially pressurized hose arrangements 17 are connected to a pressure system for creating and controlling the pressure and/or flow of pressure medium, pressure fluid inside said at least partially pressurized hose arrangements 17, and the pressurized hose arrangements 17 positioned on each side of the reel transport rail system are at least controllably connected to each other for synchronizing the movement of each support end 25 of the reel 20.

A detailed view of the support end 25 of the reel 20 on the transfer rail system 10 is schematically shown in fig. 3A-3B. The support end of the reel 20 comprises a guide groove 26 in which the guide 16 of the transfer rail system 10 is positioned to place the support end of the reel 20 in the correct position on the transfer rail 15. The pressurized hose arrangement 17 supports the support end 25 of the reel 20 at its support surface 27 on the support surface 18 of the transfer rail 15. The distance between the support surfaces 27 of the support ends 25 of the transfer rails 15 is advantageously adjustable in order to provide the desired compression pressure to the at least partially pressurized hose arrangement 17 to prevent the pressure from being released from under the support ends 25 of the reels 20. As can be seen from fig. 3A-3B, when the reel 15 is to be moved along the conveying track 15, the pressure in the at least partly pressurized hose arrangement 17 is controlled by increasing or decreasing the pressure, so that a movement in a desired direction is possible, or so that the reel 20 is stopped at a desired stop station. Said at least partially pressurized hose arrangements 17 are connected to a pressure system for creating and controlling the pressure and/or flow of pressure medium, pressure fluid inside said at least partially pressurized hose arrangements 17, and the at least partially pressurized hose arrangements 17 positioned on each side of the reel transport rail system are at least controllably connected to each other for synchronizing the movement of each support end 25 of the reel 20.

In connection with the reel transfer rail system 10, the transfer of the reel 20 on the transfer rail 15 is accomplished by means of an at least partly pressurized hose arrangement 17 positioned in a precise position on the transfer rail 15, which is advantageously located between a precisely machined support surface 18 of the transfer rail 15 and a precisely machined support portion 27 of the end of the reel 20. The movement of the reel 20 is caused by increasing the pressure in the pressurized hose arrangement on the upstream side of the reel 20 and leaving the other downstream side of the at least partially pressurized hose arrangement free of pressure or at low pressure. The stopping of the movement of the spool 20 is caused by increasing the pressure at each side of the spool 20. The at least partially pressurized hose means 17 is pressurized by a fluid, for example by a gas (advantageously pressurized air) or by a liquid (advantageously water). During the transfer of the reels 20 along the transfer tracks 15 of the reel transfer track system 10, the movement of the supporting ends 25 of the reels 20 along each transfer track 15 is synchronized by throttling control of the pressurized fluid in the at least partially pressurized hose arrangement 17. Said at least partially pressurized hose arrangements 17 are connected to a pressure system for creating and controlling the pressure and/or flow of pressure medium, pressure fluid inside said at least partially pressurized hose arrangements 17, and the at least partially pressurized hose arrangements 17 positioned on each side of the reel transport rail system are at least controllably connected to each other for synchronizing the movement of each support end 25 of the reels 20. The spool transfer rail system may also include a position measurement system 30 with a position sensor 31 connected to a pressure system 40 to measure and control the position of the spool 20. The at least partially pressurized hose assembly 17 may include a coating or a separate surface element or be surface treated to increase or decrease friction of the surface of the at least partially pressurized hose assembly 17. Furthermore, the support end 25 of the reel may comprise a coating or be surface treated to adjust the movement characteristics, i.e. increase or decrease friction.

In the foregoing description, although some functions have been described with reference to certain features, those functions may be performed by other features (whether described or not). Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples (whether described or not).

The above describes only some advantageous examples of the invention, to which the invention is not narrowly limited, and many modifications and variations are possible within the invention.