Method for placing sliver in a spinning can

Abstract

The invention relates to a method for placing fibrous material in a can (1) having a first step, in which a fibrous-material-placement head is positioned above the can (1) in a predetermined starting position (2). A cycle follows. The cycle comprises a first cycle step in which a predetermined fibrous-material length is placed into the can (1). I.e. the position of the placement head does not change. Subsequently, in a second cycle step, the placement head is shifted away from the current position according to predetermined information. The predetermined fibrous-material length is different at least between two cycles.

Description

[0001] The invention relates to the deposition of fiber material in a spinning can.

[0002] A method for depositing fiber material, particularly fiber sliver, involves rotating a stationary depositing plate over a can. In the case of a round can, this plate rotates, and in the case of a rectangular can, it oscillates. This results in the next layer of fiber sliver being deposited over the same fiber sliver rings of the previous layer of fiber sliver after each can rotation or oscillation. As a result, the intersection points of the individual fiber sliver depositing levels are positioned vertically one above the other. This causes the fiber sliver to gain height very quickly. This requires the fiber sliver to be strongly compressed in order to deposit sufficient fiber material, which has a detrimental effect on the fiber quality.

[0003] One known way to counteract this problem is to irregularly change the position of the can depositing head. This has the disadvantage that it is completely unknown where the intersection points are located and how many layers of fiber material are stacked at these points. In particular, it can happen that at some intersection points there are significantly fewer layers stacked than at others, which can reduce the maximum amount of fiber material that can be filled. As a result, it is impossible to predict how much fiber material can ultimately be deposited in the can. This type of displacement of the depositing head also leads to jerky movements and thus to stress on the can depositing device.

[0004] DE 2939316 A1 discloses a method according to the preamble of claim 1 and describes a can station for depositing fiber sliver in a round can, in which the fiber sliver is deposited alternately in mutually concentric circular ring paths, each with a different radius, on the support plate and the transition points from one circular ring path to another are arranged offset from one another.

[0005] In US 6,019,303, welding wire is deposited in a round drum by means of a device, whereby the center of a deposited welding wire winding moves around the center of the drum.

[0006] In DE 3600508 A1, a fiber sliver is deposited in a round can by means of a rotating depositing head, whereby the rotation of the depositing head is superimposed by an oscillating movement.

[0007] GB 2 048 321 A discloses the deposition of a fiber sliver in a can, wherein the rotational movement of the deposition head is superimposed by the movement of the can by means of an asymmetrical control cam.

[0008] The object of the invention is to counteract the aforementioned disadvantages.

[0009] This problem is solved by the subject matter of the independent claim. Advantageous further developments are specified in the subclaims.

[0010] A method according to the invention for depositing fiber material in a can comprises a first step in which a fiber material depositing head is positioned above the can in a predetermined starting position. This is followed by a cycle. The cycle comprises a first cycle step in which a predetermined length of fiber material is deposited into the can. This means that the position of the depositing head remains unchanged. Subsequently, in a second cycle step, the depositing head is displaced from its current position according to predetermined specifications. This means that it can be precisely determined how much fiber material is deposited into the can by the depositing head while maintaining a certain position.The predetermined displacement of the deposition head makes it possible to reduce the number of overlapping layers at the intersection points for a given number of layers, thus maximizing the fill volume and / or, in particular, positively influencing the quality of the deposited fiber material. The predetermined fiber material length varies between at least two cycles.

[0011] This allows, especially with round cans, the position of the intersection points to be varied predictably, even with only two predefined positions of the depositing head. The change between two positions occurs after slightly more than one can revolution, until the can is filled at can revolution n. Alternatively, the change between two positions occurs alternately after slightly less than one can revolution and after exactly one can revolution, until the can is filled at can revolution n.

[0012] Preferably, the fiber sliver is deposited in such a way that a whole number of fiber material rings are not deposited during one can revolution. This means that a fiber sliver ring does not begin after each can revolution, but rather slightly later. This also reduces the number of layers that overlap at the intersection points.

[0013] The deposition head is preferably moved by selectively accelerating the deposition head at the beginning of each movement and / or selectively decelerating it at the end of each movement. This results in relatively low loads on the can deposition device, which has and moves the deposition head. The deposited fiber material is preferably a fiber sliver.

[0014] Further features and advantages of the invention will become apparent from the following description of preferred embodiments. They show: Figure 1 shows a round can in two filling states according to a fiber material deposition method according to a first embodiment, Figure 2 shows two images of the fiber sliver deposition in a round can according to a second embodiment, Figure 3 shows a round can that has been filled according to a fiber material deposition method according to a third embodiment, Figure 4 shows a larger round can that has been filled according to a fiber material deposition method according to the third embodiment, Figure 5 shows a round can in two filling states that has been filled according to a fiber material deposition method according to the fourth embodiment, Figure 6 shows diagrams that illustrate deposition methods according to other embodiments, and Figure 7 shows a round can in two filling states according to a fiber material deposition method according to the Figure 6d shown embodiment and in a side view.

[0015] Figure 1shows a round can 1 in two filling states according to a fiber material deposition method according to a first embodiment .

[0016] In Figure 1a Can 1 is shown in a state in which it has completed a single rotation during filling with fiber material. Of the fiber sliver rings deposited during this process, only the topmost one is provided with reference number 7 in the figures. A bunghole 5 forms in the center of can 1. As can be seen, the position of the depositing head changes from position 3 to position 2. Positions 2, 3 always indicate the center point of the respective deposited fiber sliver ring 7.

[0017] If the can 1 is filled, the Figure 1b shown state. As can be seen, the bunghole 5 has become very small. This also reduces the number of layers of fiber material at the intersection points in the vertical direction, ie according to Figure 1into or out of the sheet level.

[0018] Figure 2 shows two images of a fiber sliver deposit not belonging to the invention in a round can 1, according to a second embodiment. According to the

[0019] Figure 2a In the process shown, there are three positions 3 - 5 for the deposit head. As a variant, the Figure 2bshown image with different depositing levels 6 1 - 6 5 . As can be seen here, the bunghole 5 is also very small. In the lowest level (position 4), the rings 7 are preferably deposited along the interior of the can 1, which is not otherwise shown. The depositing head then changes to position 3, which corresponds to a middle position of the depositing head. The depositing head is then moved to position 2 in two levels one above the other or left there. It then moves back to position 4, and then to position 2. The change between positions 2 - 4 therefore always takes place after a single can revolution or the sliver length that is deposited at the respective position 2 - 4 during one can revolution. The data relating to the respective sliver length can be stored in a database in connection with the respective depositing head position and can be easily read out using the depositing head control.This results in a very simple procedure for moving the storage head or leaving it in the respective position.

[0020] Figure 3 shows a round can 1 that was filled according to a third embodiment of a fiber material depositing method not part of the invention. Here, too, there are three depositing positions 2-4. However, the fiber sliver is deposited in such a way that the positions are continuously approached one after the other (sequence: 2, 3, 4, 2, 3, 4, ...).

[0021] Figure 4 shows a round can 1 that was filled according to a fiber material deposition method not belonging to the invention according to the third embodiment. However, the diameter of the round can 1 shown here is larger than in Figure 2 This results in Figure 4 slightly different storage image compared to Figure 2 .

[0022] Figure 5shows a round can 1 in two filling states according to a fiber material deposition method not belonging to the invention according to a fourth embodiment. In this embodiment, there are again only two positions 2, 3 for the deposition head. However, the deposition head is continuously moved from position 2 to position 3 and back again during one can rotation. This means that the distance of the fiber sliver rings 7 to the inner wall of the can 1 preferably changes continuously. In addition, according to Figure 5a After one can rotation, the sliver ring 7 rests against the inner wall of the can 1, slightly offset to the right relative to a vertical center axis. At the beginning of the sliver deposition, however, the center point of the corresponding sliver ring 7 was located directly on the center axis. This means that position 2, which the deposition head repeatedly moves to, "wanders" along a circular line around the center of the can 1.

[0023] If the can 1 is filled, the result is Figure 5b The storage image shown here also shows that the bunghole 5 is very small.

[0024] Figure 6 shows diagrams illustrating different filing methods. According to Figure 6a (not according to the invention) the position of the depositing head is changed between two positions 2 and 3 only during the first three can revolutions. After that, the depositing head remains in position 3, as is known in conventional depositing processes. The dashed lines serve to illustrate the corresponding inflection points of the graph in relation to the respective can revolution.

[0025] According to Figure 6b (not according to the invention) the change between positions 2, 3 takes place after each can revolution, again until the can 1 is filled at can revolution n.

[0026] According to Figure 6c(according to the invention) the change between positions 2, 3 takes place after slightly more than one can rotation (for example after a can rotation of 370°), and again until the can 1 is filled at can rotation n.

[0027] Alternatively, according to the invention, the change between positions 2, 3 takes place alternately after slightly less than one can revolution (for example after a can rotation of 350°) and after exactly one can revolution, again until the can 1 is filled at can revolution n.

[0028] Figure 7 shows a round can 1 in three filling states according to the fiber material deposition process of Figure 6d . In Figure 7a the can 1 is shown in a state in which it has undergone a single revolution during filling with fiber material, and Figure 7b shows the pot 1 after two turns of the pot.

[0029] Figure 7cshows the effect of the position change of the deposition head when the can 1 is full. This change causes the otherwise vertically superimposed, corresponding positions of two directly superimposed fiber sliver rings 7 to "migrate" diagonally to the top right. It is clear that, as a result, fewer layers are vertically superimposed at the intersection points when the can 1 is full.

[0030] The invention is not limited to the embodiments given above.

[0031] The process is not limited to a specific fiber material. The fiber material is preferably fiber sliver, but can also be roving, for example.

[0032] As a result, the invention creates a very universally applicable method in which it is possible to predetermine where intersection points are located and how many layers are likely to lie on top of each other at this intersection point. Reference symbol list

[0033] 1Can 2 - 4Position 5Bung hole 6 i ; i ε NStorage level 7Fiber ribbon ring

Claims

1. A method for coiling fibre material in a can (1), including: • a first step of positioning a fibre material coiling head above a can (1) in a predetermined start position (2), and • thereupon, a repeatedly performed cycle, comprising - a first cycle step of coiling a predetermined length of fibre material into the can (1), and - thereupon, a second cycle step of displacing the coiling head away from the current position (2 to 4) according to predetermined particulars, • wherein, at least between two cycles, the predetermined length of fibre material differs from each other, characterized in • that the change occurs between two positions (2, 3) respectively after somewhat more than one can revolution until the can is filled at can revolution n, or • that the change occurs between two positions (2, 3) alternately respectively after somewhat less than one can revolution and precisely after one can revolution until the can is filled at can revolution n.

2. The method according to claim 1, wherein the fibre material coiling is realized so that coiling an integer number of fibre material rings (7) is prevented during a can revolution.

3. The method according to any of the preceding claims, wherein displacing the coiling head is realized in that the coiling head • at the beginning of the respective displacing, accelerates in a targeted manner, and / or • slows down in a targeted manner at the end of the respective displacing.

4. The method according to any of the preceding claims, wherein the fibre material is sliver.

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