FI57343C - ANORDNING FOER VECKNING AV HOELJEN - Google Patents

Description

I-ra1 NOTICE. _ JUA W (11) UTLÄGCNINÖSSKRIFT 5 7 34 3 ^ T ^ (51) Kv.ik? /IM.cu3 ^ 22 C 13/02 FINLAND —FINLAND (21) Λ * · "**" · * · "" · · —RutmmMutng 772139 (22) HkkamiipUv · —An * eknlnf * d «| 08.07 * 77 (23) AHupllv · —GIMth «Mda | 21.09.72 (41) Tullut lulklMfcsI - »IMt off« itll | 08.07,77

National Board of Patents and Registration «a Nihtivik» ipwwn and other date of issue. -

Patents and registries '' AmMcan uthfd eeh uti. * KrifMn puMcand 30.0U. 80 (32) (33) (31) Tyritttr «cuoikain — BtgiKl prtorlm 23.09-71 26.06.72, 26.O6.72 Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 21U7U98.6-23 P 22311UU.0, P 223111 * 5 * 1 (71) Hoechst Aktiengesellschaft, 6230 Frankfurt (Main) 80, Federal Republic of Germany - Förbundsrepubliken Tyskland (DE) (72) Richard Regner, Mainz-Bretzenheim, Gerd Schug, Mainz-Bretzenheim,

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7 * 0 Oy Kolster Ab (5 ^) Apparatus for folding shells - Anordning för veckning av höljen (62) Divided by application 2606/72 (publication 573 ^ * 2) -Avdelad frän ansökan 2606 72 (utläggningsskrift 573 ^ 2) The present invention relates to an apparatus for folding cylindrical shells, in particular sausage casings, into pleated tubes with a continuous helical pleat, the apparatus comprising a device for located on said folding beam for folding an unfolded shell against a counter-force, wherein the folding device has at least one member arranged in continuous communication with the outer side of the shell coming to the folding station along at least one helical line, and comprising means for rotating said member from a concentric path to the longitudinal axis of the shell.

treating the intestinal rationally in particular sausage meat filling is used increasingly folded in the longitudinal direction shells today. These shells, hereinafter referred to as pleated tubes, must in particular have the following characteristics: 2 57343

The length of the unfolded shell must be as large as possible, the folded shell must have a high bending stiffness, be exactly straight, have the largest possible inside diameter and run out of the filling tube well and accurately. In addition, the shell must be free of any leaks.

Until now, the folding of sausage casings has always been carried out by a method that means mechanizing the craft. For this reason, the pleating members have also always been moved in the direction of the longitudinal axis of the sausage casing. These known methods have been continuously improved with varying degrees of success and varying technical costs

Initially, an attempt has been made to fold the sausage casing into pleated tubes by gradually folding the corrugated fingers around the sausage casings and pressing the casing against the counter-support. It was later proposed to attach the creasing fingers to the sausage casing so that the opposite area of the sausage casing was left free by the effect of the creasing force. This method provided for the coagulation of the sausage casing in the axial direction alternately by means of corrugating fingers located opposite each other. In this way, a certain improvement was achieved, as the individual folds of the sausage casing were thus galvanized in part to each other. However, the compaction ratio was quite poor. The latter method is described in DE Patent Publication No. 1,072,500. This patent publication also proposes the use of crimping forces by means of crimping fingers, each finger being moved for crimping in the direction of the sausage casing axis, but still resting successively on the sausage casing along a helical line.

In addition, in order to achieve a pleating and sealing of the sausage casing in which a substantially screw- or helical main corrugation is formed, it has been proposed to perform the pleating with the grooved rollers, in which case, however, these rollers would perform a small eccentric movement. Two, three and four such eccentrically rotating rollers have been successfully tested (cf. DT Pat. No. 1,192,072). In order to obtain a pleated tube with a helical main fold V- '' - 3 57343 1a, it has further been proposed to use three corrugated finger gears, the tooth grooves of each gear being arranged alternately in the central position, in the left position and in the right position cf. DT-pat.julk. 1,235,766).

It has also been proposed to perform folding with crimping fingers placed obliquely with respect to the longitudinal axis of the sausage casing. These pleated fingers are grooved in accordance with this proposal and adhere to the sausage casing along the discontinuous parts of the helical line (cf. DT Pat. No. 1,632,137).

What is common to all these known methods and devices is that the part in question (the crimping finger or the sector of the crimping roll) is the actual one in connection with the crimping operation, i. the sausage casing is fed against a free counter-support or counter-force, on the one hand movable in the axial direction and on the other hand in the radial direction out of the creasing area to leave space for the next pleated material. Due to this radial unfolding, the pleated fingers scratch against the sausage casing. In this case, there is a risk of damaging the sausage casing. Substantial efforts have already been made to avoid these disadvantages (cf. e.g. U.S. Pat. No. 2,583,654, especially Figure 9 and corresponding text, column 11), but none of these has been able to avoid the fundamental weaknesses of this crimping method.

It is therefore an object of the invention to provide an apparatus in which a pleated tube with highly uniform corrugations is provided in a very simple and safe manner, which transmits shell damage, which can be used with practically all sausage casing diameters and which can be realized in the simplest structural manner.

This object is solved by the apparatus according to the invention, which is essentially characterized in that it comprises at least two rollers with a concave jacket surface adapted to surround the inflated shell shortly before the point where said member is in contact with the shell, and that

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57343 it is a fastening device adapted to fasten the front end of the shell to be folded and to establish a connection between the inner part of the shell and the blowing gas source, the extent of which in the direction of the axis of the shell is substantially smaller than the folded tube formed by the shell.

In the apparatus according to the invention, the magnitude of the force causing the folding is constant and the force vector rotates about the longitudinal axis of the shell. Thus, for the first time, it is possible to carry out the crimping operation without interruption with this equipment. The apparatus provides pleated tubes in which the corrugations form very evenly and have a straightness which has hitherto not been possible without additional measures.

The force causing the folding is always and continuously applied to the same position relative to the longitudinal axis of the shell as it rotates about the axis. In this way, it is possible to obtain completely unchanged and defined working conditions with the least possible strain on the sausage casing, which has been impossible in previous methods using crimping fingers, especially since the crimping fingers moved axially during crimping, i.e. during the strongest coupling on the sausage casing.

The idea according to the invention can be realized by passing the shell to be folded over the mandrel to the counter-support, whereby the mandrel is used to blow gas, especially air, into the shell. This mandrel also has the most important function of carrying a pleated row, keeping it straight and forming the inner diameter of the pleated tube. Removing the pleat tube from the mandrel leads to a certain risk of damage to the shells, ”especially when working very fine shells. To avoid these disadvantages, the mandrels - which are known per se - are usually made slightly conical and provided with a very smooth surface. In addition, the use of a lubricant during folding is planned, mainly between the oil, the mandrel and the shell (internal lubrication). It is expensive to make inches with a very small karticpcikkeao from a precise cylinder liner.

Another sub-problem that can be solved by the preferred embodiment of the present invention is to improve the method according to the invention so as to avoid the problems and disadvantages which the use of an inch inevitably entails.

S 57343 This is achieved by applying the folding force to at least one part of the shell which moves around the longitudinal axis of the shell, but so that the shell is folded in a free-bearing manner in relation to the pleated tube formed. The term "free-bearing" then means that the pleated tube, with the exception of the short seat, if any, stands separately free-standing as such, without internal guidance from the counter-supporting part providing the counterforce.

In the apparatus according to the invention, the folding element has at least one member arranged in continuous operation with the outer side of the shell coming to the folding station along at least one screw line, and comprises means for rotating said member concentrically along a path along the longitudinal axis of the shell.

The ring part is preferably in the shape of a sleeve and the folding part is a protruding screw screw into the cylindrical interior of the sleeve. For this purpose, the sleeve may have a helically threaded inner door into which a correspondingly threaded part protrudes from the cylindrical inner side of the sleeve as a screw rise, the threaded part consisting of a material having advantageous sliding properties. Very good results are obtained when the sleeve and the screw-threaded protrusion or screw-threaded protrusions are made in one piece.

It is also conceivable that a plurality of detents are pivotally attached to the ring part for pivotally mounted small wheels and that the small wheels are arranged in the longitudinal direction of the shell and in the circumferential direction, each time displaced.

Such a device has proved advantageous in which the ring part is made in the form of a hjfey which surrounds the shell in use and from the inner side of which protrudes at least one helically twisted protrusion in use connected to the shell surface, but at least one ring-rotating part of the shell in engagement with the housing, in the feed-in direction of the housing, as part of the sector of the periphery continuously connected to the housing in use, and whose axis of rotation thus carries a helically rotated protrusion at an angle of inclination with respect to the housing longitudinal axis so that the small wheel in use as it rotates.

The apparatus implementing the free-bearing folding method described above has means for feeding the shell to the folding station and a counter-support with an opening through which the expansion gas is fed inside the shell. In this case, the folding station has an annular part surrounding the shell in use and which can be rotated around it, and the folding part is attached to the annular part and the counter-support for attaching the shell end and connecting the interior of the shell with the expansion gas connection. shorter than the pleated tube to be obtained.

· <.C rv S7343

The described device has the essential advantage that the removal of the shell, i.e. the pleated tube, is very simple in it. The tube only needs to be removed from a very short fastener. The expensive structures used so far with a weakly conical mandrel need not be used at all. The removal distance in the direction of the shell axis is also considerably shortened. In addition, the risk of damaging the pipe is very small.

Other details of the device according to the invention will become apparent from the following description and claims.

In the drawings Fig. 1 shows a schematic view of a device according to the invention, Fig. 2 shows a partial view of the device shown in Fig. 1, Fig. 3 shows a partial sectional view of a second embodiment of a device according to the invention, Fig. 1 * shows a detail of the device in the longitudinal axis, Fig. 5 shows a perspective view Fig. 6 shows different shapes of the profile against which the shell can be pushed together, Fig. 7 shows two views of a different embodiment of the device according to the invention, Fig. 8 shows a schematic view of another device according to the invention.

In the device shown in Fig. 1, a flat-compressed shell 1 is located on a storage coil 2. The motor 5 drives rollers U and V via a gear 6 and feeds the sausage shell 1 'over the mandrel 7 to the drawing means. By means of the mandrel 7, air is blown in a manner known per se to inflate the shell 1. The expanded shell 1 'moves further between the two rollers 9 and 9' driven by the motor 5 through the gear 8, the operation of which will be described in more detail in connection with Fig. K, further towards the actual folding station. By means of the nozzle 10, a lubricant can be placed on the shell 1 '. Once the shell has passed through the parts 11 described in more detail below, it will be compressed tightly. The folding takes place against a movable counter-support 13 which applies a constant counter-force to the sausage casing in the opposite direction to its feed direction, e.g. by means of a weight 16 suspended on a rope 1U and reversing rollers 15.

The actual crimping operation will now be described with reference to Fig. 2. Inside the stop 17, the sleeve 18 is fixedly connected to the pulley 19 and pivotally mounted by means of a bearing 20. Inside the sleeve 18 there is a helically twisted, protruding protrusion 21, the shape of which is better seen in the partially cut-away view shown in Fig. 5. The pulley 19 is connected to a drive belt 22, by means of which the pulley 19 can be rotated.

’57343

The expanded shell 1 'engages with the helically twisted protrusion 21, as shown in Figure 2. The circumferential speed of the rollers 4 and 4 'and the grooved rollers 9 and 9' is preferably adjusted so as to accurately give the feed speed * of the shell 1 obtained from the rotational speed of the sleeve 1Θ and the protrusion 21 and the pitch of the helical thread of the protrusion 21.

Most of the helically twisted protrusion 21 of the expanded shell 1 'provides a certain preforming, but the actual folding and pressing operation is provided by the end 23 of the protrusion 21 facing the counter-support. This end 23 (cf. Fig. 5) presses against the counterforce K of the sausage casing 13 in front of the helical thread ', whereby this end 23 passes with the casing during folding. A double or multi-threaded protrusion can also be used from the shaft of the single-threaded protrusion 21. When two helical protrusions are used, a pleated part is moved with respect to each other.

In the single operation described, a tube 12 was produced in a single step, which can be well removed from the inch 7 and has high bending strength and excellent straightness. The compression ratio was better than 00: 1.

Figure 3 shows another embodiment of the device according to the invention. This embodiment differs from that shown in Figure 2 in that the end 23 of the helically threaded protrusion 21 inside the sleeve 18 does not provide the actual folding and pressing operation, but a separate sprocket 24 is used for this. The stop 25 of the sprocket 24 is fixedly connected to the drive wheel surrounding the shell 1 '. With 19. The small wheel 24 is then arranged so as to engage the recess 26 formed by the helical protrusion in the shell 1 '. The small wheel 24 runs together with the wheel 19 around the shell and forms in the shell dense folds against each other against the counterforce K.

Figure 7 shows a different embodiment. In this embodiment of the device according to the invention, a helically twisted protrusion 21 is not used in the sleeve 18. Instead, four stops 27 are used for the respective small wheels 28, which are moved 90 ° relative to each other with respect to the longitudinal direction of the shell 1 '. The axial length of these stops 27 increases from wheel to wheel - i.e. for each quarter turn - by the same amount. In this embodiment, the shafts of the small wheels 28 are inclined so that in use the small wheels 28 form a helical recess in the expanded shell 1 'and run in this recess. The small wheel 28 closest to the counter-support 13 performs the actual folding and pressing operation when it places the shell in the form of overlapping corrugations against the counter-support 13 or the folding tube 12. By using such small wheels 28 instead of the helically twisted protrusion 21 (Fig. 2), the advantage is achieved that the shell is subjected to a very low frictional stress. This can significantly increase the working speed and reduce the risk of damage to the shell. If desired, small bikes can be used, for example, via a planetary gear.

8 57343

The mathematical axes of rotation of the small wheels 28 are such that they are in each case located at the point of contact perpendicular to the tangent to the helical line formed by it on the passing shell 1 '. The distance between this axis of rotation and the axis of the shell is equal to the sum of the radius of the shell and the radius of the small wheel minus the depth of the depression formed by the small wheel 28 in the shell 1 '.

In order to illustrate the special operation of the grooved rollers 9 and 9 ', reference is now made to Figures 2 and U. The protrusion 21 connected to the shell 1' and also to a certain extent the small wheels 28 tend to rotate the shell 1 'in its direction of rotation. The motor-driven rollers 9 and 9 'counteract this. The expanded shell 1 'settles inside the grooves of the rollers 9 and 9' and on the rollers. This control completely prevents undesired rotation of the shell 1 '.

Figure 6 shows various examples of the shapes of the compression profile achievable with the device according to the invention. The main purpose of these different shapes is to achieve a high bending stiffness of the finished tube and at the same time a good sealing ratio (ratio of the length of the unfolded shell to the length of the blister).

In addition to the solution to be performed, the following advantages can be achieved with the device according to the invention. It is possible to produce a finished tube 12, i.e. a sausage casing with a compaction ratio of 80: 1 and higher, in a single operation, i. without a subsequent pressing step. In addition, this method of operation can be carried out very carefully and provides a pipe which is completely undamaged despite the small thickness of the wall, the corrugations of which are hitherto uniform and which have a high bending stiffness.

The structure of the device is very simple and its operation is reliable. The same device can be used for different intestinal diameters, in which case the fitting of the device can be performed by means of a handle or automatically. With the device according to the invention, it is possible to work more economically and faster than with hitherto known methods.

The device shown in Figure 8 substantially corresponds to that shown in Figure 1. However, at the beginning of the folding operation, the end of the shell 1 is pulled onto a short seat 30 projecting from the counter-support 13 and clamped here by means of two clamping jaws 31, 31 'communicating with two compressed air cylinders 32 and 32'. Compressed air is supplied inside the housing through the opening 33, so that the shell 1 associated with the rollers k and U 'is inflated. The actual folding operation takes place as described in the folding section 11.

It has now been found that the mandrel can be completely dispensed with when folding <according to this method. Namely, the described method forms a fold _ | a tube 12 having such a uniform and precise shape and straightness that also a box tube; At longer lengths, the pleating can be performed freely against the load-bearing pleat pipe 12. the short seat 30 is then used only to fasten the shell head. In this way, a tube having a length of 25 cm and a sealing ratio (the length of the pleated shell relative to the length of the pleated tube) of 80 and more is folded, without subsequent pressing action. The free-bearing pleat tube 12 had a very evenly circular interior and did not lay out any individual corrugations, so that it was possible to insert a filling tube without difficulty to fill the pleat tube with sausage mass.

In the example described, the diameter of the expanded shell 1 'was about 18 mm. The inside diameter of the pleated tube was just over 11.2. In the example, a creasing section with a pitch of 12 mm was used.

Removing the finished pipe from the counter support is very simple. Namely, the tube only needs to be pushed down from the seat 30, e.g. by means of the jaws 31, 31 ', whereby the shell 1 sits very loosely on the seat for this purpose. Thus, it is not necessary to use the hitherto, mechanically and procedurally expensive measures to push the finished blister 12 out of the weakly conical mandrel, which is shown in Fig. 1 by reference number 7 ·

Claims (3)

10 S7343 An apparatus for folding cylindrical shells, in particular sausage casings, into pleated tubes (12) with a continuous helical pleat, the apparatus comprising a device (4, 4 ') for feeding the shell (V) forward in its unfolded state along its longitudinal axis to the folding station (11); 30) for supplying a blowing gas inside the shell and a folding device (18,19,21,23,24,25, 27, 28) located at said folding station for folding the blown-open shell against the counter force caused by the response (13-16), the folding device having at least one member (21, 23, 24, 28) arranged in continuous operation with the outer side of the shell (V) coming to the folding station (11) along at least one helical line (26), and comprising means (5, 17, 19, 20, 22, 27) for rotating said member. along a path running along the longitudinal axis of the shell (1 '), characterized in that it comprises at least two rollers (9, 9') with a concave jacket surface arranged to surround the inflated shell (V) shortly before the point where said member (21, 23, 24, 28. is in contact with the shell, and that a fastening device (30, 31, 31 ', 32, 32') is arranged on the stop (13-16) for fastening the front end of the foldable shell (V) and establishing a connection between the inner part of the shell and the blowing gas source. , the extent of which in the axial direction of the shell (1 ') is substantially smaller than the pleated tube (12) formed by the shell. Apparatus according to Claim 1, characterized in that the rollers (9, 9 ') are motor-driven. Apparatus according to claim 1, characterized in that the fastening device (30, 31, 31 ', 32, 32') comprises a short seat (30) projecting from the stop (13-16) to which the end of the shell (1 *) can be fastened and having at least one blowing gas supply passage (33) to the interior of the shell. 5 k "