DE2401474A1 - CUTTING DEVICE FOR METAL CANS - Google Patents

Description

DR. RUDOLF BAUER DIPL.-ING. HELMUT HUBBUCH PATENT LAWYERS

753 PFORZHEIM. ^ί * *

WESTLICHE 31 (AM _-1 LEOPOLDPLATz) TEL. «37231):

Standunlnc, Compton (California) U3..i. Trimming device for metal cans .

The invention relates to cutting mechanisms for devices for trimming metallic can bodies and the like.

In the manufacture of seamless metallic can bodies with molded bottoms and open upper ends that are in the finished product In the state that they can be used as containers for beverages, the dosage bodies are usually made by pulling and smoothing the Wall formed from aluminum, tinplate or blackplate. When the can bodies get to the trimmers, they are already done except for the last trimming of the v / andung by the trimming devices. the Can bodies must have a certain axial in their final shape Have length. The open ends must be used to accommodate the lids that are put on in the course of filling the beverage will be trimmed smoothly.

In the final form of the can body, its wall has a thickness of the order of magnitude of 0.20 mm _o sticking to a relatively tight final dimension tolerance of the can body

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The main requirement of the trimming of the can body wall is that the trimming be done from the inside out so that if a slight burr remains at the open end after trimming, that burr is on the outer surface and not the inner surface. This is a fundamental demand that is raised from this for various reasons the industry, among other reasons, because especially in the bottling and placing the cover accidental penetration is necessary to prevent metal shavings into the Innere'des can body _o Furthermore, a internal Burrs when putting on the lid and closing the can cause difficulties.

Therefore, all known modern devices for trimming metallic can bodies are provided with various devices which ensure a certain interaction of the cutting tools of the trimming device with the applications of the metallic can bodies to be trimmed. Quite satisfactory, the problem was, however, none of the known devices for cutting metal can body gelösto particular, three factors are of importance: The V / andungen the metal can body must be circumcised with repeatable accuracy in large batches to relatively precise dimensions ₀ By Spanungs- bzwo trimming process must the can bodies are trimmed cleanly at the open ends, and where there remain a minimum of flash only at the outer edge, can prevent the formation of metal chips _o for maximum productive capacity of the trimming device to ensure the cutting must or ₀ trimming tools are clamped so, that they can be easily removed, sharpened and reinstalled in a minimum of time.

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At least in some of the known devices for trimming metallic can bodies, the one-piece metallic can bodies pushed axially onto a mandrel and over an internally arranged cylindrical trimming knife, which lies in the axial direction under the end section of the can wall ring to be cut off as a waste ring. The dimensions of the trimming knife arranged on the inside correspond as precisely as possible to the outer circumference Internal dimensions of the can body wall, however the can body wall is still more acceptable from a manufacturing point of view Speed can be pushed over the trimming knife. During the actual trimming process and upon severing the scrap ring from the can body, the can body and the inside are disposed cylindrical trimmers rotated at the same time, while an externally arranged trimmer inwards moves against the can wall, at least partially penetrates it and then on a circular path around the can wall is guided to separate the waste ring from the can body while this waste ring is on the inside arranged trimming knife is supported.

In other words, while the part of the can body wall which ultimately forms the waste ring, inside of is supported by the trimming knife arranged on the inside, the trimming knife arranged on the outside is axially adjacent one of the closed end of the can body to be trimmed in the axial direction facing side moved inside »In this inward movement

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penetrates the outwardly disposed trimming cutter, the can body wall, wherein mutually facing radial surfaces of the internally disposed Eeschneidemessers one hand and the externally disposed trimming knife cooperating on the other hand, _o around the waste ring to separate completely from the can body wall Important is, however, the fact that, since the part of the can body wall , which ultimately forms the waste ring, is internally supported, the can wall is not supported axially next to the trimmed can body edge to be produced and is pressed inwards by the trimming knife arranged on the outside during the trimming process, so that a burr that may remain on this trimmed edge outwards and does not protrude inwards »

Since all elements involved, namely the can body, the inwardly disposed trimming cutter and the outwardly disposed trimming knife must rotate necessarily, the rotatable mounting of these elements has caused considerable difficulties, although the can body and the interiorly disposed trimming cutter can rotate simultaneously _o ¥ hen one considers that the can body, as mentioned above, need to be trimmed to relatively precise dimensions and with a clean edge, it is at this twofold rotational movement extremely difficult during extended use in the production of the trimming tools _o knife or maintain accurate dimensions. In order to meet this requirement, an exact alignment between the cutting tools or knives as well as for tensioning and holding the can body must be guaranteed at all times.

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In addition, these known trimming devices have the disadvantage that the part of the respective can body, which is left over after trimming and is to be used, deformed inward during trimming is, while the part of the can wall, which is finally eliminated as a waste ring, from the inside arranged Knife is supported o With the known trimming devices, this is necessary so that the most trimmed The edge of the can body is on the outside and not on the inside Elements inevitable in the known trimming devices. Though inevitable, this type of tension is there nevertheless objectionable insofar as they strive to Dimensionally trimmed can bodies with a cleanly trimmed edge at the open end are the same again Opposes difficulties.

Since the inner and outer trimming knives of these known trimming devices are cutting Tools, care must of course be taken that the cutting surfaces of these tools are always sharp For this it is necessary that the knives are often removed, sharpened and reinstalled, which is a corresponding In view of the complex turning and other movements, has this very sharp of the tools requires a relatively long time and leads to considerable loss of production time for the relevant person Trimming device out, taking into account that the removed tools, too must be reinstalled and aligned very precisely with the other elements.

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Another difficulty arises from the fact that with each trimming cycle, the movement of the outer trimming knife must be steered inward around the can body wall and then outward again through a curve. In the known machines, this cam-controlled movement was effected with the aid of conventional cam systems, which necessarily connected to the outer trimming knife and outside of the support and clamping of the inner trimming knife are arranged. This not only complicates the alignment, but also contributes significantly an increase in the overall dimensions of the trimming device, since the known curve systems are relatively heavy and take up a lot of space

The invention is based on the object of a cutting mechanism for devices for trimming metallic can bodies and the like, in which a metallic can body is positioned on a mandrel that the can body wall is at an open end axially extending the can and severing a scrap ring from the open end of the can. This object is achieved according to the invention solved in that an outer cutting ring with an annular, radially extending and end face axially directed cutting surface is provided as well as an internally arranged trimming knife with a radial extending and axially facing cutting surface, one with the can body in operative connection standing holding device that holds the can body in place on the mandrel while the waste ring is severed is, a cutting ring clamping device for clamping the cutting ring in such a way that he the Externally surrounds can body wall at the open end of the can body, the can body wall axially extending extends through the cutting ring and the cutting surface of the cutting ring extending radially outward on the

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Can body wall adjoins, while the can body is held in the described V / eise, and a Beschnei demesserspannvorrichtung for clamping the trimming knife within the can body wall at the open end of the can body, while the can body is held in the manner described, wherein the trimming knife is substantially radially can be extended outward from an inner retraction into an outer trimming position in order to at least partially penetrate the can body wall axially next to the cutting surface of the cutting ring with the cutting surface of the trimming knife, whereupon the trimming knife is then moved in the circumferential direction around the can body wall and the cutting surface of the trimming knife with the cutting surface of the cutting ring cooperates to sever the waste ring from the open end of the can body and the trimming knife is then retracted substantially radially inwardly again to the retracted position rd, wherein the cutting ring clamping device clamps the cutting ring ₉ so that the cutting surface of the cutting ring assumes a precisely defined axial position, and has a reference surface ring assigned to the cutting ring, which is designed and arranged so that the cutting surface of the cutting ring despite removal of the cutting ring and axial reduction of the The cutting surface of the cutting ring is always reinstalled in exactly the same axial position ₀

An embodiment of the invention is described below with reference to the drawings. Show:

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Pig. 1 is a side view of a trimming machine for metallic can bodies in a preferred embodiment of the principles of the invention,

Fig. 2 is a plan view in the direction of arrows 2-2 in Fig. 1,

Fig. 3 is a vertical partial section in the direction of Arrows 3-3 in Fig. 2,

FIG. 4 shows an enlarged horizontal partial section in the direction of arrows 4-4 in FIG according to Fig. 1 belonging pusher in the completely withdrawn or retracted position shows,

Figure 5 is an enlarged vertical partial section in the direction of arrows 5-5 in Figure 4> the jar still in the fully retracted position Position is,

Fig. 6 is an enlarged vertical partial section in the direction of arrows 6-6 in Fig. 4, the pusher is still in the fully retracted position, but a can body is positioned so that the pusher can be brought to rest on this can body ,

7 shows a vertical partial section through the right-hand part of FIG. 6, but with the pushing device is in the fully retracted position immediately after a trimmed can body has been ejected,

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8 is an enlarged vertical partial section in the direction of FIG. Arrows 8-8 in Fig. 2 with a can body, in the same way as during the trimming process from the pusher on the trimming mandrel has been positioned

9 shows an enlarged vertical section in the direction of arrows 9-9 in FIG. 8,

FIG. 10 shows a horizontal partial section in the direction of arrows 10-10 in FIG. 9,

11 shows a vertical section in the direction of arrows 11-11 in FIG. 10,

FIG. 12 shows a vertical partial section in the direction of arrows 12-12 in FIG. 10,

13 shows an enlarged vertical section in the direction of arrows 13-13 in FIG. 8,

14 shows a vertical partial section in the direction of arrows 14-14 in FIG. 13,

15 is a vertical partial section in the direction of FIG Arrows 15-15 in Fig. 14,

16, 17, 18, 23 and 27 are schematic representations of the pusher device in various successive forms Stages of movement from the fully retracted position to the transport of an uncircumcised one Can body from the loading station to the trimming station to the transport of the trimmed Can body from the trimming station back to the

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Loading station, where it is ejected from the feeder,

19j, 20, 21 and 22 are schematic representations in FIG Direction of arrows 19-19 in Fig. 18, which illustrate the actual process of trimming the can body, and

Figs. 24, 25 and 26 are schematic representations corresponding to those in Figures 19-22, but illustrating the process of waste disposal.

Description of a particularly preferred embodiment of the invention ;

An embodiment of a trimming machine for metallic can bodies is shown as a whole in FIGS and 3 shown. It consists of a standard main stand, designated as a whole with 30, for the entire machine, as a support and in some cases as a housing to accommodate various work assemblies which are required for an operational trimming machine as a whole. For convenience the trimming machine as a whole is described first »This is followed by separate ones Descriptions of the individual work assemblies and finally a general description of the method of operation of the entire trimming machine »The individual components or subgroups described are

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is a supply and designated as a whole with 32 Positioning device, a trimming device designated as a whole as 34 and a trimming device as a whole 36 designated garbage disposal device.

The trimming machine as a whole is controlled via an electrical control panel 38 and a main stand 30 leading cable duct 40 supplied with electrical power. Similarly, compressed air is fed into the main stand 30 and, in the usual way, the components that work with compressed air, as will be discussed later in connection with the feed and

Positioning device will be described in detail. The main stand 3 ° also contains the electrical one Main motor and the connecting elements required to drive the various assemblies of the trimming device Transmission systems, with the V / irkv connections between these groups and systems are established in the usual way, as shown in the following individual descriptions is clearer.

The various parts and elements of the trimming device are made in the usual way from the usual Materials and are, unless expressly mentioned in the following, all known to the person skilled in the art.

FEEDING TOID POSITIONING DEVICE 32

The feeding and positioning device shown in Fig. 1 to 8 of the drawings consists of an essential component vertical task guide 42, over which the Ma-

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machine continuously untrimmed, drawn from above metallic can body 44 with smoothed walls as well closed ends 46 and open ends 48 supplied in order to then be received individually in the pockets 50 of a rotatable wheel spider 52. The uncircumcised At this point in time, can bodies 44 are, as far as the shaping is concerned, except for the final wall trimming process, by which the can bodies are cut to the desired length, essentially done. The uncut can bodies 44 are preferably made of suitable metals such as aluminum, Tinplate and blackplate, shaped and have wall thicknesses on the order of 0.20 mm. she are suitable as containers for beverages, such as beer and soft drinks.

The wheel spider 52 is in the usual way as a clocked Formed ratchet which is driven by means known to those skilled in the art and clocked so that proper functioning in relation to the functioning of the various other elements, as follows is guaranteed. As can be seen from the drawing, the wheel spider 52 rotates about a horizontal one Axis and moves the uncut can body 44 in a clocked switching movement - according to the illustration in Fig. 3 counterclockwise - in two switching steps to a charging station designated as a whole with 54, where each individual can body is detected in a known manner by a contactless measuring sensor 56 of the usual type,

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to ensure that the remaining elements of the assembly are not actuated until a can body is located is in the charging station. As described elsewhere below, the person in the charging station- ^ respective uncut can bodies 44 are removed from the loading station for trimming and then brought back as a can body 58 with trimmed wall, whereupon when the wheel spider 52 is switched on, the trimmed can body 58 in two switching steps in the downwardly sloping removal guide 60 are ejected, from which the trimmed can bodies due to the downward slope in a suitable container or another, not shown in the drawing Transport device slip.

In the loading station 54, the uncut can bodies 44 are held by the wheel spider 52 so that the The cylinder axis of the can body runs horizontally and the closed end 46 to the left, the open end 48 pointing to the right as shown in the drawing. One designated as a whole by 62 and in detail in FIGS. 4-6 The pusher depicted is preferably positioned so that it is axially aligned with the loading station 54. In the retracted, i.e., retracted, position, the pusher 62 is on the far left of the loading station (Pig. 2, 5 and 6). However, it is axially loaded in the manner

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Wegli ^cn "is that the wheel center can be extended to 52 to a designated as a whole by trimming station 64 by the charging station 54 and the corresponding pocket 50th The trimming station as well as the one in it

66 station arranged trimming mandrels belong to the trimming device to be described below 34

As shown in FIGS. 4 to 6, the pusher device 62 consists of an axially extending immovable vacuum tube 68, which is connected at its left end to a vacuum supply tube 70 with a rigid connection. A vacuum flow sensor f2 connected to the interior of the vacuum supply pipe 70 (Fig. 5) measures the continuous flow in the pipe in the usual manner and is electrically connected to appropriate controls which interrupt or switch off the operation of the trimming machine when the sensor has a continuous vacuum flow measures, as will be described in more detail below. The vacuum tube 68 ends at its right end at an axial distance from the loading station 54 in an ejector stop 74 »but the opening of the vacuum tube continues through the center of the stop and opens to the right of the ejector stop (FIG. 6).

A shock tube 76 slides over the vacuum tube 78, on which it is axially displaceable with the help of appropriate bearings. On the left, the shock tube 76 ends in a radial direction Outwardly enlarged cylinder stop ring 78. Right

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the shock tube ends at an axial distance beyond the right end of the vacuum tube 68 in a radially enlarged vacuum cup 80 that is open to the right. A guide 82 that extends vertically upwards is attached to the cylinder stop ring 78. This guide is for its part received at the top in a guide block 84, which is guided in an axially sliding manner in a guide groove 86, to support and guide the axial reciprocating movement of the push tube 76.

An ejector 88 is axially slidable in the vacuum cup 80 and the right end of the shock tube 76. A vacuum port 90 arranged in this ejector opens on the one hand in the axial direction to the right in the opening of the vacuum cup 80 and on the other hand with a radial Distance to the left end of the ejector in the push tube 76. So if, as shown in Figs. 17, 18 and 23, the ejector 88 is moved all the way to the left into the vacuum cup 80, the vacuum opening is in place 90 of the ejector in connection with the vacuum tube 68, so that the vacuum cup 80 is subjected to a vacuum through this opening. Venn, on the other hand, the ejector 88 is moved all the way forward or to the right, so that it, as shown in Fig. 7, out of the vacuum cup 80 protrudes, the vacuum opening 90 is closed by the vacuum cup so that no vacuum can flow through it can and the vacuum tube 68 is thus closed. The purpose and sequence of these movements are to be described in detail elsewhere.

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Immediately before or _o to the right of the cylinder stop ring 78 slides over the shock tube 76, a cylinder 92 for a flowing medium, preferably a pneumatic cylinder, which is spaced outwards to the shock tube and sealed at both ends in a suitable manner so as to slide axially can be moved relative to the shock tube. This sliding seal of the cylinder 32 is formed at its front or right end by a piston 94 fastened to the shock tube 6. At the rear or left end of the cylinder 32 , its interior is connected to a supply line 96 for a flowing medium through which a flowing medium, preferably a gaseous medium, such as air, is fed under pressure into the cylinder a relief valve arranged 99, wherein the pressure sensor measures 97 ä- ^en pressure of the flowing medium and the air in the interior of the cylinder exceeds a predetermined pressure, and is connected to the main control elements of the trimming machine electrically in such a way that the operation of the machine is interrupted when the measured pressure exceeds the specified pressure, while the relief valve 99 serves to blow off at least the air pressure from the cylinder that exceeds the specified pressure. The purpose of this arrangement will also have to be described below.

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As can best be seen from FIG. 4, the rear end of the cylinder is for the flowing medium or the pneumatic cylinder 92 pivotally connected to both sides with toggle lever drive arms 98, which are arranged so that when a Pivoting the drive arms 98 of the cylinders 92 forward or is printed to the right while panning the drive arms in the opposite direction pushes the cylinder backwards or to the left. The swing stroke the drive arms 98 is sized so that when filled of cylinder 92 with a stormy meditation, preferably Air or other gaseous medium, under pressure, preferably on the order of 2.612 atmospheres, pivoting the drive arms 98 forward the cylinder axially forward and through piston 94 and the air pressure trapped in the cylinder push tube 76 axially forward from the fully retracted position to the left of the wheel spider 52 forward to the right through the wheel spider and to trimming station 64 while moving drive arms 98 in the opposite direction retracting the push tube or bumper backwards back to the left to the fully retracted position Stop of the cylinder on the cylinder stop ring 78 on the Shock tube or bumper causes.

The back and forth movement of the shock tube * J6 is therefore exclusively caused by the flowing medium or air cushion or the pressure in the cylinder 92, and if that

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Shock tube should hit an obstacle that creates a counterforce sufficient to increase the pressure in the cylinder overcome, the cylinder can deflect by compressing the air enclosed in it, i.e. the inevitable driven cylinder can continue to move forward to the right while the shock tube stops, so that this piston compresses the air in the cylinder. Since the pressure in cylinder 92 is determined by the pressure sensor is monitored on the air supply line 96, can also the whole trimming machine will be switched off automatically when the pressure in the cylinder reaches a predetermined level reached higher pressure, which indicates a counterforce of sufficient magnitude, while at the same time the relief valve 99 reduces the air pressure which exceeds the specified higher pressure, so that the pressure in the Cylinder remains at least below the specified higher pressure,

This axial pressure compliance of the cylinder, the shock tube or _e is the bumper 16 is therefore protected from serious damage when the push rod as it moves forward in the loading station 54 'between the loading station and the cropping station 64 or in the trimming station to the Ausfahrendstellung the bumper on a counterforce of sufficient size meets »Such a counterforce of sufficient size could

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for example by incorrectly positioning an uncut can body 44 in the loading station 54 or a damaged or deformed can body in the loading station, the unintentional penetration of an obstacle into the space between the loading station 54 and the trimming station 64, an obstacle on the trimming mandrel 66 of the trimming station 64, by which a smooth pushing of an uncut can body 44 on the trimming mandrel by the push rod 76 is prevented, or incorrect positioning of an uncut can body 44 on the push rod 76, which a smooth pushing on on the trimming mandrel 66 in the trimming station 64 prevented. All of these and other obstructions could cause an opposing force sufficient to cause the cylinder $ 2 to deflect. This would automatically switch off the trimming machine and prevent serious damage to the shock tube or the bumper 76 or various other elements on the charging station 64, which are still to be described in the following, and at the same time the excess air pressure would be blown off to prevent serious damage to the cylinder 92 to prevent.

Further, the arrangement of the vacuum tube 68 is selected relative to the shock tube 76 so that the ejector 88 in the fully retracted, or _o leftmost position of the shock tube n as shown in Figo 7 ^a the ejector

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stop 74 rests on the vacuum tube 68 and is pressed forwards or to the right relative to the vacuum cup and as a result, as shown in the drawing, protrudes from the 'vacuum cup. If, however, the push tube J6 is extended so far relative to the vacuum tube 68 that the vacuum cup 80 removes the ejector 88 from its contact with the ejector stop 74 of the vacuum pipe 68, the ejector can move freely to the rear or to the left relative to the vacuum cup, whereby one slight resistance or a slight backward movement is sufficient to cause such a rearward movement of the ejector. As a result, the ejector 88, as shown in FIGS. 17, 18 and 23, moves into its rearward position relative to the vacuum cup 80.

During the operation of this feeding and positioning device 32 or this part of the trimming machine, the shock tube 76 is initially located in the position shown in FIG. 6 shown fully retracted, i.e. retracted position. By switching the wheel spider 52, an uncut Can body 44 positioned in a loading station 54 so that from there to trimming its open end 48 Trimming station 64 can be transported. At this point in time, the vacuum cup 80 is at a distance in front of the uncut can body 44 »while the ejector 88 at the ejector stop 74 at the end of the vacuum tube 68 is applied, the vacuum opening 90 closes and axially after

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protrudes from the front or to the right of the yakuum cup. Of course, this is the ejection division of the ejector 88 into which the ejector automatically reached when the push tube "JG" returned to the final position when the immediately preceding work cycle had ended.

In this position, in which the shock tube 76 is ready to start for the completion of a complete work cycle, is in the retracted end position, so the vacuum cup 80 completed by the automatically positioned ejector 88 from the vacuum supply, this Vacuum control in the immediate vicinity of the vacuum cup is arranged. Furthermore, there are both the vacuum cup 80 and the ejector 88 arranged in its interior with a small rearward axial distance, but axially precisely aligned in front of the one introduced into the charging station 54 uncut can body 44 · The air pressure in the cylinder 92 is approx. 2.812 at., so that an air cushion with a certain pressure maintaining the correct position between the cylinder and the shock tube 76, the rear end of the cylinder in the axial direction against the cylinder stop ring 78 rests against the shock tube.

At the beginning of a work cycle, the drive arms 98 guide the forward pivoting movement to the right, as shown in Fig. 4, so that the cylinder 92

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moved axially forward and the shock tube 76 axially forward takes away. The axially protruding ejector 88 comes first at the closed end 46 of the uncut Can body 44 to the plant, and since the rear Has removed the end of the ejector in the axial direction from the ejector stop 74 of the vacuum tube 68, the Resistance of the uncut can body that the ejector moves axially backwards and completely into the vacuum cup 80 is inserted. Practically at the same time the vacuum cup 80 comes to the closed one End 46 of the uncut can body 44 to the plant, and since the ejector 88 now assumes an axially rearward position relative to the vacuum cup 80, the Vacuum cup 80 from vacuum tube 68 via the now opened vacuum openings 90 in the ejector with vacuum applied so that the uncut can body is stretched by vacuum tension. This effective Vacuum tension takes place practically simultaneously with the rearward insertion of the ejector 88 and the release of the vacuum openings 90 »as the vacuum control is located directly next to the vacuum cup 80 and therefore no longer vacuum lines are emptied have to.

In the course of the further forward or feed movement of the Shock tube 76, the uncut can body 44 with the open end 48 first from its inclusion in

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Wheel spider 52 at the loading station 54 is pushed axially to the trimming station 64 and finally over the trimming mandrel 66 into the position shown in FIG. 8. During this shock movement of the shock tube 76, the uncut can body 44 remains firmly clamped as a result of the yakuum tension described. When the untrimmed can body is pushed over its entire length over the trimming mandrel 66, the cylinder 92 is extended by the drive arms 98 to an end position which extends slightly beyond the position that would be required for the push tube 76 to completely cover this uncut can body 44 Trimming mandrel 66 can slide. The cylinder 92 is thus axially advanced somewhat relative to the shock tube 76, so that the shock tube piston 94 assumes the position indicated by the dashed line 100 and the cylinder stop ring 78 of the shock tube the position indicated by the dashed line 102 in FIG. As a result, the air in the cylinder is slightly compressed and the uncut can body 44 is axially pressurized in order to keep it in its slipped position on the trimming mandrel 66. in order to interrupt the operation or shutdown of the trimming machine by the cylinder pressure sensor or to blow off the excess pressure through the relief valve 99. cause.

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After the can body has been trimmed in the manner to be described later, the drive arms 98 begin their rearward pivoting movement. In doing so, they take the cylinder 92 with them up to the stop on the cylinder stop ring 78 of the shock tube f6 , whereupon the shock tube also begins to move backwards, whereby the return or retraction stroke is initiated. As a result of the vacuum tension through the vacuum cup 80, the now trimmed can body 58 is pulled off the trimming mandrel 66 and from the trimming station 64. The push tube 76 transports the trimmed can body 58 from the trimming station 64 back to the loading station 54, where it is reinserted into the receptacle in the wheel spider 52 while the push tube approaches the end of its retraction stroke and thus its end position.

As can be seen from FIG. 7, the ejector 88 comes to rest against the vacuum tube ejector stop 74 when the push tube J6 moves into its retracted end position at the end of this retraction stroke. As a result, the ejector is advanced relative to the vacuum cup 80 so that it comes to rest against the closed end 46 of the trimmed can body 58. When the shock tube 76 finally moves into the retracted end position, the ejector 88 pushes the trimmed can body 58 axially out of the vacuum tension through the vacuum cup 80, and at the same time

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the vacuum cup is cut off from the vacuum supply from vacuum tube 68 by the relative forward movement of the ejector. This releases the trimmed can body 58 from the push tube J6 so that the wheel spider 52 can be indexed to bring the next uncut can body 44 into the loading station 54, whereupon the next cycle of the apparatus can begin.

As previously indicated, the forward movement of the push tube can be halted while the cylinder 92 continues to advance if the uncut can body and push tube f6 encounter one of the various conceivable opposing forces previously described during the forward or feed stroke. When this counterforce is sufficient to overcome the pressure of 2.812 at. In cylinder 92, the cylinder begins to compress, ie. it sets in an axial relative movement between the shock tube and the cylinder, so that the air pressure inside the cylinder increases. As soon as this air pressure inside the cylinder reaches a certain value, for example by relative movement between the shock tube 76 and the cylinder 92 up to the dashed position of the shock tube piston 94 ″ at 103 in FIG. 6, the cylinder pressure sensor 97 measures this pressure increase compared to the specified pressure and switches the trimming device

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automatically via electrical connections of the usual type, while the relief valve 99 blows off the excess pressure. In this way the trimming device is protected against serious damage.

If the vacuum cup 80 of the shock tube falls into incorrect position comes to rest on an uncut can body 44 or the closed end 46 of the Can body is split or broken as a result of improper shaping or the vacuum tension of the can body lost for this or any other reason at any point during the working cycle goes, the unusual continuous vacuum flow caused thereby becomes from the vacuum flow sensor 72 measured and the pusher 62 and / or the entire trimming machine switched off. In order to is an additional safeguard against damage to machine elements or improper operation given.

TRIMMING DEVICE TMG 34

The arrangement of the trimming device 34 in the trimming machine as a whole is shown in FIGS. 1 and 2, while the details of the device can be seen in particular in FIGS. 8 to 15. In general, the main elements of the trimming device 34 or _{e are} the elements through which the actual trimming is carried out

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an uncut can body 44 is effected to an outer annular counter-holder or cutting ring 104 with a radially extending cutting surface 106 and an inner trimming knife 108 having a radially extending cutting surface 110. In Figs. 10, 12 and 14 are these elements shown in the position in which the trimming of the can body takes place. An important consideration for certain basic ideas of the invention is also the fact that the cutting ring I04, as well as the uncut can body 44 is immobile during the trimming operation while the trimming knife 108 is rotatable about its central knife axis. The knife and its axis are around a central axis of the trimming mandrel 66 and the uncut can body 44 to be trimmed is rotatable. In addition, the knife can be radial outwards into the position shown in the drawing, in which the can body is trimmed, as well as on the Moving the wall of the uncut can body radially inwards. This entire sequence of movements is made possible by the arrangement described immediately below.

In addition to the elements mentioned above, the trimming device 34 consists of a main drive gear 112, which is a bearing in the main stand 30 and

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about the center axis of the string mandrel 66 rotatable cutting and pinching frame 114 set in rotating motion. The cutting and pinching frame 114 ends on the left as shown in the drawing or at the trimming mandrel 66 initially in an externally threaded waste disposal cylinder 116 which is partially radially inward to the waste disposal device 36 is arranged, and finally in a repository 118, which Slides over part of the stringing mandrel 66 and serves as a neck bearing (FIGS. 10, 12 and 14). The trimming knife 108 is in a manner that will be described in detail below, on one Fastened knife shaft 120, the knife shaft mounted freely rotatably with the pin in a knife frame 122 is, which in turn by attachment to a rotatably mounted on the cutting and lasting frame 114, axially pivotable control rod 124 with the cutting and last frame 114 is rotatably connected (Fig. 13 » 14 and 15). As shown in Figs. 14 and 15, the right end of the knife frame 122 is at the right end of the Control rod 124 attached, and although the left end of the control rod in Fig. 14 is missing, other important ones Parts of the goal direction become visible, the left end of the knife frame 122 is similarly at the Control rod attached.

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Thus, the trimming knife 108, the knife shaft 120 and the knife frame 122 are rotatable in the manner on Cutting and pinching frame 114 stored that the trimming knife relative to the cutting and pinching frame a pivoting movement outwards and inwards about the axis of the control rod 124 can perform, which is greatly offset from the central axis of the cutting and Zwickräbmens. Simultaneously the cutting and lasting frame 114 is rotatable about its central axis, that of the central axis of the trimming mandrel 66 corresponds, which is driven by the main drive gear 112 and the trimming knife 108 over takes the knife shaft 120 and the knife frame 122 with it during this rotary movement about the center axis of the trimming mandrel. In this way, the trimming knife 108, which is freely rotatable about its own central axis, can get out of it inner position inward of the immovable cutting ring 104 and an uncut protruding through the cutting ring Can body 44 are pivoted radially outward into the cutting or trimming position in which it is extends radially through the uncut can body and against the cutting ring and so rotated about the cutting ring can be that the uncut can body is trimmed on its entire circumference. At the same time it can Trimming knife 108 are held inwardly in its retracted position so that it is from the cutting ring IO4 is free, but from the main drive gear 112 and the Cutting and lasting frames II4 are still constantly around the

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Center axis of the trimming mandrel 66 is rotated.

The pivot control of the trimming knife 108 between its inner Einfahlrs division and outer cutting or Trimming is done by the mechanism shown in FIGS. 8, 13 and 14. This mechanism exists from a control lever 126, which is pivotable at one end about the control rod 124 and at the other end with a rotatably mounted cam roller is provided. The cam roller 128 lies outwards on the inner cam surface 130 of a separately rotating cam ring I32 which is driven by a cam gear 134 (Fig. 8 and I4) constantly at a speed deviating from the speed of the cutting and pinching frame 114, but around the Center axis of the trimming mandrel 66 is rotated. In the middle of the length of the control lever 126 is a wedge I36, which extends in the axial direction and has an inclined surface 138, axially in a corresponding one Notch of control lever added. This wedge lies radially inwards on the outer peripheral surface of the knife. frame 122, so that the pivot position of the trimming knife 108, the knife shaft 120 and the knife frame 122 about the axis of the control rod 124 from the cam roller 128 of the control lever and the inner cam surface I30 of the cam ring is determined. As can be seen from FIG. 13, the knife frame 122 is and Zwick frame II4 and attached by a spiral spring

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142 radially inwardly pushed, radially "movable Piston I40 resiliently pressed against wedge I36 and held and controlled by this.

Thus, the cam ring 132 controls the pivoting movement of the trimming knife 108 outwards and inwards, while the trimming knife through the cutting and pinching frame 114 constantly around the center axis of the trimming mandrel 66 is rotated. Due to the special design of the cam surface I30 on the cam ring 132 and the special Training of the trimming machine according to the invention leads the cam ring 132 constantly two complete revolutions for every three complete revolutions of the constantly rotating cutting and lasting frame II4 around the central axis of the trimming mandrel 66, so that the trimming knife 108 during one revolution of the cutting and Zwickrahmens II4 pivoted outwards into the position in which the can body is trimmed, and during two revolutions of the cutting and pinching frame inward, ie. in the position in which there is no circumcision of the can body. Three turns of the cutting and Zwickrahmens II4 thus form a working cycle of trimming machine according to the invention.

As can be seen from FIGS. 14 and 15, it is radial between the control lever 126 and the knife shaft 120 arranged wedge I36 with the end of an axially extending Curve positioning rod 144 connected, whose

£ 09831/0320

the other end is provided with a thread and rotatably mounted in one in the end wall of the knife frame 122 Adjusting scale I46 is screwed in. This structure causes that a rotation of the setting scale I46 in one direction, the wedge I36 axially in one direction relative to the Control lever 126 and rotation of the dial in the other direction puts the wedge in the axially opposite direction Moved direction relative to the joystick. Since the wedge 136 rests with the inclined surface 138 on the control lever 126, This axial adjustment of the wedge causes a radial movement of the knife shaft 120, the knife frame 122 and the trimming knife 108 inwardly and outwardly relative to the center axis of the trimming mandrel 66. Thus can be the radial penetration of the wall of the uncut can body 44 by the trimming knife 108 can be controlled adjustably relative to the outer, immovable cutting ring 104.

It has been shown that with the illustrated and described elements of the trimming machine a satisfactory Trimming is achieved when the trimming knife 108 is up to one-half to three-quarters the wall thickness penetrates into the walls of the uncut can body 44. Preferably, however Trimming knives 108 penetrate the can body walls completely and about 0.025 rom radially beyond it, wherein

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the can walls should have a metal thickness of approx. 0.20 mm in order to allow proper trimming guarantee.

As shown in FIGS. 12 and 14 and in particular from the particular one The type of clamping of the trimming knife 108 on the knife shaft 120 is the trimming knife ring-shaped, with its radial cutting surface 110 in the axial direction of the cutting surface 106 of the cutting ring I04 faces, i.e. in the representation according to Fig. 12 and Η points to the left. That The end of the knife shaft 120 is provided with a clamping cover 148 provided, the radial mounting surface 150 in the axial Direction of the cutting surface 110 of the trimming knife faces. In the one shown in the drawing Arrangement, the trimming knife 108 is selectively removable and firmly connected to the clamping cover I48, the The cutting surface 110 of the trimming knife is fixed in the axial direction to the clamping surface I50 of the clamping cover is applied, while the clamping cover I48 in turn selectively expandable rests on the end face of the knife shaft 120 and is firmly connected to it.

Thus, although the cutter shaft 120 can be moved radially inwards and outwards in a controllable manner during the work cycle, around the trimming knife 108 in the manner already described between the inner retracted position

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and to move the outer circumcision position back and forth, However, it always remains in a set axial position, i.e. always extends over the same set position Distance in the axial direction. Since the clamping cover 148 is always firmly attached to the end face of the knife shaft 120 and the cutting surface 110 of the trimming knife always rests against the clamping surface 150 of the clamping cover the important cutting surface 110 of the trimming knife is always axially fixed radially in the same position radial plane, i.e. exactly at the same point in axial sighting. That means that in the described Position the cutting surface 110 of the trimming knife regardless of the axial thickness of the trimming knife 108 is always exactly at the same point in the axial direction Direction is located.

The described arrangement is important for the clamping of the trimming knife 108 as the Snow surface 110 of the trimming knife 108 during the Einsa'tzes the trimming machine often has to be reground, since this part of the trimming knife interacts with the cutting surface 106 on the cutting ring 104, the actual trimming of the can body wall executes. ¥ enn the cutting surface 110 of the trimming knife 108 must be reground, is it is only necessary to remove the clamping cover I48 from the

£ 09831/0320

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To remove knife shaft 120 and the trimming knife 108 from the clamping cover I4Ö, the cutting surface 110 of the Regrind the trimming knife and reassemble the various elements as described, whereby - and this is particularly important - regardless of the reground cutting surface 110 of the trimming knife the fact that the cutting knife 108 is now somewhat narrower in the axial direction, in the axial direction is brought back into exactly the same position. Since the cutting surface 110 of the trimming knife as a result of their axial contact with a clamping surface that is always fixed at exactly the same axial point in the axial direction, namely the clamping surface 150 of the clamping cover, serves as a reference surface for the clamping, the trimming knife 108 can in its special type of clamping With the clamping cover I48 it can be removed quickly at any time and after the cutting surface has been ground 110 of the trimming knife can be reinstalled without the risk of changing the orientation of the cutting surface of the trimming knife to the required counter-cutting surface 10ό of the cutting ring I04. Of the Removal and reinstallation of the trimming knife 108 can therefore be carried out in a minimum of time, at least in in a much shorter time than was previously possible with the trimmers of the known type.

£ 09831/0320

According to the invention, a similar, advantageous clamping of a special type of the immovable cutting ring is also provided 104 provided on the main stand 30, such as in particular from FIGS. 10 and 12 can be seen. As shown, the cutting ring I04 is with its radially extending and axially facing cutting surface 106 facing in the axial direction of the cutting surface 110 of the trimming knife, when the trimming knife is in its outer position trimming the can body wall will. So if the cutting surface 110 of the trimming knife 108 is always in a certain set Axial position, the cutting surface I06 of the cutting ring I04 must always be exactly in a certain axial position.

As can be seen from the drawing, the cutting ring 104 lies on the axially facing away from the cutting surface IO6 Side in the axial direction on a clamping ring 152 with im substantial L-shaped cross-section, with a radially outwardly extending leg of this clamping ring radially on the outside of the cutting ring I04 also rests axially on a compensating spacer ring 154. The balancing one Spacer ring 154 is, apart from its fixation by the system, axially both relative to the cutting ring 104 as well as to the clamping ring 152 and displaceable is adjacent to radial sections of both parts in the axial direction. In the middle of the cutting ring I04 the compensating spacer ring 154 rests axially on a locking ring I56, which extends over an axial section of the cutting ring 104 pushes and rests against it radially on the outside.

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The locking ring I56 positions the cutting ring through its inner radial contact with the cutting ring 104 radially in precise fixation relative to the other elements of the trimming station 64 and is in turn locked radially on the outside in a recess in the main stand. On the same axial side as the Locking ring 156 rests on the compensating spacer ring 154, the locking ring rests axially on one locking spacer ring 158, which in turn axially rests against the main stand 30, the locking ring 156 and the locking spacer ring 158 on the Main stand 30 are attached. This is completed special clamping of the ski ring I04 a clamping ring resting axially on the main stand 30 160 with a radially inwardly protruding section that axially with a section of the clamping ring 152 aligned, with radially adjustable clamping screws 162 axially penetrating the clamping ring I6O and in in the axial direction firmly against the clamping ring 152

can be pulled.

The cutting ring 104 is in the described arrangement as long as the various elements have their respective Keep the dimensions unchanged, always in exactly the same radial and axial position, whereby in particular the cutting surface 106 of the cutting

Λ 0 9 8 3 1/0320

rings 104 are always in the same axial position or radial plane relative to the cutting surface 110 of the trimming knife 108 ″ with which it must cooperate in trimming the can body wall. Of course, the cutting ring IO4 is removed from the locking ring 156 always held in the same radial position. According to the invention, however, the fact is more important that the cutting surface IO6 of the cutting ring by the clamping of the closing ring on the clamping ring 152, the contact of the clamping ring on the compensating spacer ring 154 and the contact of the compensating spacer ring on the locking ring 156, which is in a certain axial position is braced with the main stand 30, is always held in the same axial position relative to the trimming knife 108. If otherwise does not change anything, this exact axial positioning of the cutting surface IO6 of the cutting ring remains through the Fixed Yers tension of the clamping screws 162 of the clamping ring 160 against the clamping ring 152 obtained, but to it must be taken into account that the cutting surface I06 of the cutting ring IO4 as well as the cutting surface 110 of the Trimming knife 108 has to be re-ground from time to time and that, if all other elements of the device remain unchanged, the cutting surface 106 of the cutting ring as a result of the grinding in axial sighting away from the cutting surface of the trimming knife.

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Dahpr is shown and described in the case of the special device according to the invention when the cutting ring 104 for regrinding the radial cutting surface 106 is removed, the compensating spacer ring 154 is also removed and on a radial surface around the precisely sanded off the same amount. For reasons of convenience, the cutting ring IO4 and the compensating Spacer ring 154 is preferably formed with exactly the same axial dimensions, so that these both entrances with the compensating spacer ring 154 above the cutting ring IO4 and with each other radially aligned radial surfaces can be added on the same grinding machine, so that when The cutting surface IO6 of the cutting ring automatically grinds the aligned radial surface of the compensating Spacer ring 154 by exactly the same amount is sanded down with. This grinding of the cutting surface 106 of the cutting ring and one of the radial surfaces of the compensating spacer ring 154 by exactly the same amount has the consequence that when Reinstallation of the various elements of the device and after axial clamping by the Clamping screws 162 of the clamping ring 160 the reground cutting surface 106 of the cutting ring IO4 again assumes exactly the same axial position relative to the cutting surface 110 of the trimming knife 108 as previously. Realignment of the cutting surface IO6

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of the cutting ring IO4 takes place after regrinding so with this particular device automatically, so that when disassembling, grinding and reassembling the time-consuming realignment is no longer necessary and the "Overall, the process takes a lot less time than previously known with the trimming devices Design type.

During the operation of the trimming device 34 »the a component of the trimming machine according to the invention forms, pushes the pusher tube 76 of the pusher 62 in the manner already described an uncut can body 44 in the trimming station 64 via the trimming mandrel 66 into the position shown in FIGS. 8, 10, 12 and Η, however during this postponement of the uncut can body the uncut can body protrudes through the cutting ring I04, the trimming knife 108 protrudes but is in its radially inner retracted position, because the cam roller 128 of the control lever 126 at this time on part of the inner Cam surface 130 of the cam ring 132 with a maximum radial dimension is applied. After the uncut can body 44 is axially completely removed from the pusher 62 has been pushed onto the trimming mandrel 66 and through the cutting ring 104, the pusher holds

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the uncircumcised can body as a result of the already described slight increase in pressure of the air in the Pneumatic cylinder 92 and preferably also with the aid of the vacuum tensioning also already described through the vacuum cup 80 axially against the trimming mandrel 66. Since the shock tube 76 including the vacuum cup 80 of the pusher 62 are non-rotatable, both the uncut can body and the Trimming mandrel 66 by this axial pressure against the uncut can body 44 and the vacuum tension held immovable in their position during the entire pruning process, especially in connection with with the immovable cutting ring IO4 the accuracy and greatly improves the efficiency of the trimming process.

Immediately after the uncut can body 44 has been pushed into its end position on the trimming mandrel 66, the cam roller 128 of the control lever 126 reaches the part of the inner cam surface on its orbit 130 of the Kiucrwuenring 132 with the lower one radial dimension and as a result moves radially inward. As a result, the knife frame 122 and the knife shaft 120 is pivoted radially outward, taking the trimming knife 108 with it radially outward, so that the walls of the uncut can

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body 44 initially in that shown in FIGS. 10, 12 and 14 Way to be pierced. Since the cutting and lasting frame 114 is constantly around the central axis of the trimming mandrel 66 and rotates relative to the main stand 30, the trimming knife 108, when it is the The wall of the immovable uncut can body 44 pierces circumferentially around the can body wall once Taken around the entire circumference of the can body, it being noted that a complete To this extent, rotation of the trimming knife 108 around the entire circumference of the can body is not necessary would be, as the trimming knife is circular and thus covers part of the circumference. Through this upward movement of the trimming knife 108, in which the cutting surface 110 of the trimming knife with the cutting surface 106 of the immovable cutting ring cooperates, the desired wall portion of the can body at its open end 48 of the Can body separated, so that finally one of the separated wall portion of the can body formed waste ring I64, which in a way which will be described in the following is eliminated. Immediately after the waste ring has been severed from the uncut can body 44 so that the trimmed can body 58 remains, The pusher 62 pulls the now trimmed through the vacuum tension already described Can body 58 from the trimming mandrel 66 and leads it from the trimming station 64 back to the loading station 54, while the trimming knife 108 through

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the inner cam surface I30 of the cam ring 132 is controlled, retracts radially inwards again.

WASTE DISPOSAL DEVICE

Me general arrangement of the garbage disposal device 36 in the trimming device as a whole is shown in FIGS. 2, 8, 10 and 14. Details are shown in FIG. 11. As in particular from Figo 11 can be seen, the waste disposal device 36 consists of as a whole designated I66, preferably diametrically opposed lasting devices, which are attached to the cutting and lasting frame 114 are attached and therefore with the cutting and lasting frame in an axial arrangement next to the cutting surface 106 of the cutting ring I04 can be continuously rotated about the center axis of the trimming mandrel 66. The lasting devices 166 are thus radially outward to a portion of the one already described Externally threaded waste disposal cylinder 116 (Fig. 14) and extending to the sheet of the waste rings I64 severed from the uncut can bodies 44 in the trimming station 64 radially outwards.

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As can be seen from FIG. 11, the two lasting devices 166 are essentially the same. Both wise a frame part 168 which is attached to the cutting and lasting frame 114 is attached to a relative movement between the lasting devices and the cutting and lasting frame, while on the other hand the frame part 168 with the cutting and lasting frame 114 - constantly around the central axis of the trimming mandrel can turn. A lasting device actuating element 170 is pivotably articulated on each of the frame parts 168, that in the rest position of springs 172, which are supported against the frame parts 168, resiliently pushed outwardly and moved inwardly and outwardly by pins 174f extending through the lasting device actuators and extend through enlarged bores I76 in the frame parts will. The lasting device actuators 170 are radially outwardly facing and substantially Provided in the circumferential direction extending cam surfaces 178, which in the axial direction to an actuating roller 180 are aligned, this actuating roller with the aid of control elements known to those skilled in the art are, at the point at which the lasting device is arranged, under the cutting and lasting frame 114 can be moved up and down.

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On the lasting device actuators 170 is each has an actuating pin 162 attached, the circumference of which at each of the outer ends extends radially inwardly extending and radially back and forth movable tie rods 184 resting in the frame parts 168 are guided to slide radially. The holder of the pincer rods 184 is designed so that these in are moved essentially radially by the pivoting movements of the clamping device actuating elements I70, however, perform a slight pivoting movement relative to these, which is caused by in notches 188 of the pincer rods received retaining pins 186 of the lasting device actuators I70 is effected. In the event of a pivoting movement of the lasting device actuating elements 170 and radial reciprocation of the pincer rods I84 inwardly and outwardly slide the inner or cutting ends of the pincer rods I84 radially on waste positioning elements 190 and cover waste slots 192 of the waste positioning elements in the circumferential direction when the pincer bars 184 are moved inward while they are radially outward from the Stand waste slots and release them when the tie rods are moved outwards. As from Fig. 11 As can be seen, the waste slots 192 extend circumferentially through the waste positioning elements 190, and as shown in Figs. 12 and 14, these are

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Waste slots axially at least in the axial direction open towards the cutting ring 104, that is to say in the axial direction from which the uncut can body 44 be inserted over the trimming mandrel 66 and through the cutting ring.

So if, as best seen in Figs. 11 and 12, the uncut can bodies are transported to the trimming station 64 and all over the trimming mandrel 66 be pushed so that they are in the position in which they are in the manner already described can be trimmed, the wall parts at the open ends 48 of the uncut can body received at least partially axially in the waste slots 192 of the lasting devices 166, wherein the actuating roller 180 at this point in its lower position and the trimming knife 108 in its inner retracted position. At this time the waste positioning elements 190 attached to the frame parts 168 rotate continuously with the cutting and pincer frame II4 around the center axis of the trimming mandrel 66. As already described, the uncut can bodies 44 'remain immovable in their position stand while the waste positioning elements I90 rotate with the end portions of the uncut can bodies remaining in the scrap slots 192. These

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Relative movement continues while the trimming knife 108 extends outward in a cam-controlled manner and the can body is trimmed axially, so that the now trimmed can body 58 and the waste rings I64 result.

Immediately after a certain waste ring by trimming a certain uncut can body 164 has been generated, this waste ring 164, which has now become the immovable, now lies trimmed can body 58 has no connection, completely on the lasting devices 166 and begins, to rotate with these. Now the actuating roller 180 is made from the one with solid lines The position shown is moved upward into the position shown in dashed lines in FIG. 11. When the first of the As the continuously rotating lasting device 166 arrives at the actuating roller 180, the actuating roller rolls in the circumferential direction on the cam surface 178 of the lasting device actuation element. This will make the lasting device actuator I70 pivoted radially inward and the pincer bar moved inward so that it radially at the waste slot 192 along the waste positioning element slides and separates the waste ring I64 at this point. As soon as the relevant lasting device 166 is in

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Moved circumferentially beyond the location of the actuating roller 180, the lasting device actuating device pivots element I70 radially outwards so that the pinch rod 184 is also withdrawn.

If then the other lasting device 166 with the waste ring now rotating with this device I64 arrives at the location of the actuating roller 180, repeatedly the same separation process. After completion of the second separating or pinching process, the actuating roller 180 down into the lower, ineffective one shown in FIG. 11 with solid lines Lowered position. Thus, in the course of a complete revolution of the lasting devices 166 each Waste ring I64 cut or tweaked into two separate pieces, with the individual pinching devices each at different times, corresponding to the distance of half a turn of the cutting and Zwickrahmens II4 come into operation. When the garbage ring 164, as described, is cut into individual pieces, these pieces become as a result of the rotation of the waste ring immediately by centrifugal force from the elements of the can body trimmer flung away outward. As can be seen from FIGS. 1 and 2, the individual parts fall of the severed waste ring I64, as soon as the centrifugal force has been exhausted, under its own Weight in the waste chute 194, through which it is finally in a suitable container outside the trimming machine.

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The threading on the circumference of the trash cylinder 116, which is located radially inward of the pinch devices 166 and continuously rotates with the cutting and pinching frame 114, has the purpose of moving the scrap ring 164 axially away from the stationary cutting ring IO4 and further into the scrap slots 192 of FIG Moving waste positioning elements 190 in if the waste ring does not reach the rotational speed of the cylinder 116 at any time after it has been separated from the can, for example if the waste ring or any part of this ring adheres to the immovable cutting ring IO4 or is thrown against the immovable cutting ring. In other words, this thread on the circumference of the waste disposal cylinder 116 runs in the direction that it moves away from the respective, now trimmed can body 58 and towards the closed sides of the waste slots 192 in the waste positioning elements 190 during the continuous rotation of the cutting and pinching frame 114 seems to screw, so that the waste ring I64 in question should stop or rotate at a slower speed than the waste disposal cylinder II6 and consequently come to rest on this cylinder, in the direction of the waste slots 192 and deeper into them, whereby the The waste ring is effectively pushed all the way into the waste slots for cutting, which also has the advantage of

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that the waste ring or the individual pieces of the severed waste ring are prevented from being in to move in the axially opposite direction where they perform the function of the various elements of the can body trimmer and the positioning surfaces could interfere. It is also threaded provided peripheral surface of the waste disposal cylinder 116 constantly covered with oil during the operation of the trimming machine, so that the individual pieces of waste are prevented from sticking there, and due to centrifugal force or gravity from the Release cylinder 116 and drop down into waste chute 194.

WORKING METHOD OF THE CUTTING MACHINE AS A WHOLE

In the following, a single overall working cycle of the Trimming machine described, which, as already mentioned, in exactly three revolutions of the cutting and pinching frame 114 is terminated.

In FIG. 16, the wheel spider 52 has first been switched and now positions an uncut can body 44 in the loading station 54 in such a way that it is axially aligned with the pushing device 62. The push tube Ί & the pushing device 62 is in the completely retracted or retracted position - in the figure on the far left - and the ejector 88 is

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come to rest on the ejector stop 74, so that this forces the ejector into the ejection division, in which it protrudes from the vacuum cup 80 to the outside. The ejector tube 76 is therefore exactly in his Retracted end position and, after reversing the direction, in the starting position for the beginning of a work cycle.

In FIG. 17, the advance stroke of the push tube 76 has begun. The shock tube vacuum cup 80 is at the closed end 46 of the uncut can body 44 came to the plant. As a result of this abutment of the vacuum cup 80 of the shock tube on the uncircumcised Can body 44 is ejector 88 through both the closed end 46 of the can body and through the moment of the shock tube has been pressed backwards or to the left relative to the vacuum cup, so that the vacuum opening 90 of the ejector is now in communication with the vacuum tube 68. This causes immediate a fixed vacuum tension of the uncut can body 44 through the vacuum cup 80 of the shock tube.

In FIG. 18 the push tube "] β continues its forward feed movement to the right and pushes the uncut can body 44 out of the wheel spider 52 and over its full length over the cutting mandrel 66 in the cutting station 64"

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It should be noted that at this stage of the working cycle the cutting and pinching frame II4 rotates continuously, but the trimming knife 108 rotates radially inward remains retracted and the lasting devices 166 are still ineffective, i.e. not yet actuated. By axially pushing the uncut can body 44 through the push tube 76 onto the cutting mandrel 66 in the trimming station 64, however, is the uncut open end 48 of the uncut Can body 44 through the cutting ring I04 into the waste positioning elements 190 (Figs. 24, 25 and 26) of the Lasting devices 166 have been inserted. The uncut can body 44 and the trimming mandrel 66 remain under the action of the vacuum tension and the axial pressure of the shock tube 76 in the circumferential direction immobile. The cutting ring IO4 always remains immobile while the retracted trimming knife 108 and the not yet actuated pinching devices 166 as a result of the constant rotation of the cutting and Lasting frame 114 continues to rotate.

As can be seen from FIG. 19, once the uncut can body 44j, as shown in FIG. 18, has been positioned in the trimming station 64, cam-controlled radially moved outwardly towards the wall of the uncut can body 44, the

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Trimming knives and pinching devices 166 continue rotate, but the lasting devices are not yet actuated because the actuating roller is in the lower position. In Fig. 20, the trimming knife 108 has moved radially all the way out, pierce the wall of the uncut can body 44 in cooperation with the cutting ring IO4 (FIG. 18) and started creating scrap ring 164 by trimming the can body. In Fig. 21 has the trimming knife 108 in the circumferential direction Turned a little further and cut the can body further. In Fig. 22 the trimming knife has 108 completed a full revolution and thereby the waste ring I64 completely from the open end 48 of the uncut can body 44 separated. The trimming knife can now retract radially inwards and the actuating roller 180 is moved upward to the position in which it holds the pinching devices 166 actuated.

As can be seen from FIG. 24, the first of the two lasting devices 166 comes with the waste ring 164, which now rotates with the lasting devices, on the actuating roller, which is now in the upper position 180 on, while the trimming knife 108 retracts radially inward, so that when this

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Lasting device moves past the actuating roller, the cam surface 178 of the lasting device actuating element 170 comes to rest on the actuating roller and the pinch bar I84 on the waste locator I90 pushes past radially inward, so that the waste ring 164 is cut or pinched through on one side. The continuous rotation of the cutting and pinch frame II4 causes the second pinch device 166, as shown in Fig. 25, in the same Way is operated so that the cut or pinched parts of the waste ring I64 after fall down and thus removed from the trimmer 34 and waste disposal device 36 will. Immediately thereafter, as shown in Fig. 26, the operating roller 180 goes down to the inoperative Position withdrawn.

During the cutting of the waste ring I64 by the Lasting devices of the garbage disposal device 36 were operated simultaneously by actuating the pushing device 62 initiated the return stroke to the left and the now trimmed can body 58 as a result of Vacuum tension is transported from the trimming station 64 back to the loading station 54. In Fig. 23 this has Shock tube 76 the trimmed can body 58 just now completely withdrawn into the wheel spider 52 again. In

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Pig. 27 finally the ejector 88 has come to rest against the ejector stop 74. This will make the Ejector pressed axially forward relative to vacuum cup 80. As a result, the vacuum cup from the Vacuum supply is cut off and that at the closed end 46 of the cut can body 58 adjacent ejector ejects the trimmed can body from the pusher 62. So that the pusher has 62 ends its retraction or retraction stroke and is now ready for again the beginning of the next working cycle, while the wheel spider 52 is switched to the trimmed To remove can body 58 from loading station 54 and to position the next uncut can body 44 as shown in Fig. 16 in the loading station, with which the work cycle is ended.

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With the described cutting mechanisms for trimming devices for metallic can bodies and the like, trimming metallic can body walls very considerably improved and a maximum accuracy and cleanliness of the cut achieved, which is practical eliminates all problems of insufficient voltage, and also those necessary for mass production Speeds can be achieved. Both the metal can body and the wall to be trimmed The can body as well as the cutting ring surrounding the can body are during the trimming process immovably clamped, so that the trimming knife arranged inside is the only movable element is. This not only eliminates numerous problems relating to alignment between the different ones Elements to ensure an accurate and clean trimming of the can body wall, but it results There is also a simplification of fixtures and cutting tool maintenance.

A new interaction special kind between the cutting or ₀ trimming tools results in a more accurate and cleaner trimmed edge of the can body wall, but to put the possibly formed during the cutting burr so as the outside and not inside the wall of the demand of the industry,

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240U74

finished trimmed can body runs, is still fulfilled. Supports itself during the trimming process the can body wall to the outside on the outer cutting ring, against which it duroh the outward one Movement of the inner trimming knife is printed, with only the part of the can body wall that ends at the end is separated as a waste ring, is deformed to a greater extent during the trimming process. This results in a more accurate and cleaner circumcision of the can body, while a possibly nascent Burr, as required, is still on the outside.

In order to resharpen the tool, a sufficient Flächenschliffo When re-orienting the cutting surfaces of the individual tools need to be aligned to each other, d _o h only axially. they must each be brought into the correct radial plane in order to ensure proper axial cooperation during the trimming process. The trimming knife and the cutting ring are therefore clamped by clamping elements of a special type in such a way that their radial cutting surfaces are always used again in exactly the same radial plane, although they are. The axial thickness of the tools naturally changes slightly. This automatically realigns the tools quickly and efficiently when they are reinstalled.

409831/0320

The relatively complex sequence of movements of the innm% irgl-i * ^ ^ The arranged trimming knife is controlled by an inner cam surface, which is formed by a cam ring can be, which is only arranged at an axial distance from the trimming knife and its clamping elements must be, which allows a reduction in the overall dimensions of the trimming machine and numerous Difficulties with the known cam mechanisms, not only in terms of dimensions, but also eliminated with regard to the mechanical connections of the same with the trimming knife the cam ring can be arranged so that it is at the same time as the frame on which the trimming knife is attached directly, but can be rotated at a different speed, up In this way, the dimensions of the cam ring controlling the trimming knife can be kept to a minimum can be reduced, but with a complete and precise control of the relatively complex sequence of movements of the trimming knife is still guaranteed.

Despite the required relatively complex sequence of movements of the trimming knife, the trimming knife be arranged so that it is easily adjustable in its radially outward and inward movement is that so the penetration of the can body wall by the trimming knife is fast and

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409831/0320

ORIGINAL

SB 240U74

conveniently set to the size required for the desired clamping or trimming of the can wall can be. Since the trimming knife and the cutting ring with their respective axially and radially acting co-operating cutting surfaces, is sufficient to adjust these radially extending surfaces a greater or lesser penetration of the can body wall a corresponding adjustment of the radial Overlap between the respective cutting surfaces. This results in a relatively simple adjustability of the radially extending cutting surfaces for penetration of the can body wall to one another, the far is less critical than in the known devices, as long as sufficient penetration of the Can body wall guaranteed remains o

Although the principles of the feeding device according to the invention are of a special kind based on a trimming machine shown and described for metallic can bodies is not intended to remove the Basic idea of the invention exclusively on trimming machines or other devices for the production Limit of Doses »Those skilled in the art will understand that the improvements of this invention are applicable to numerous forms of equipment of various kinds, so that the scope of the invention is fully extended is to be interpreted.

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409831/0320

Claims (1)

240U74 PATENT CLAIMS 1β) Cutting mechanism for devices for trimming metallic can bodies and the like "in which a metallic can body is positioned on a mandrel so that the can body wall extends axially at an open end of the can and a waste ring is severed from the open end of the can thereby characterized in that an outer cutting ring (104) with an annular, radially extending and axially directed cutting surface (106) is provided as well as an internally arranged trimming knife (108) with a radially extending and axially directed cutting surface (HO), one with the can body (44) operatively connected holding device (80, 88), which holds the can body (44) in its position on the mandrel (66) while the waste ring (I64) is separated, a cutting ring clamping device (i52i 154 »156, I58) ZiJI ¹¹ Clamp the cutting ring (IO4) in such a way that it touches the can body wall at the open end (48) of the can body on the outside, the can body wall extending axially through the cutting ring (I04) and the cutting surface (106) of the cutting ring extending radially outwardly adjoins the can body wall while the can body is held in the manner described, and a trimming knife clamping device (120, 148 ) for clamping the trimming knife (108) within the can body wall at the open end (46) of the - 61 - 409831/0320 Can body, while the can body is held in the manner described, wherein the trimming knife (108) can be extended substantially radially outward from an inner retracted position into an outer trimming position in order to use the cutting surface (11 θ) of the trimming knife to axially adjoin the can body wall To penetrate the cutting surface (106) of the cutting ring at least partially, after which the trimming knife is then moved in the circumferential direction around the can body wall and the cutting surface (110) of the trimming knife cooperates with the cutting surface (106) of the son's ring to remove the waste ring (I64) from the open end (48) of the can body and the trimming knife is then retracted essentially radially inward again into the retracted position, the cutting ring clamping device (152, 154 »156, 158) tensioning the cutting ring (104) so that the cutting surface (106) of the cutting ring assumes a precisely determined axial position, and e in the cutting ring (IO4) assigned reference surface ring (154), which is designed and arranged so that the cutting surface (I06) of the cutting ring is always exactly the same despite removal of the cutting ring (IO4) and axial reduction of the cutting surface (IO6) of the cutting ring axial position is _{reinstalled o} - 62 - 409831/0320 2. Cutting mechanism according to claim 1, characterized in that the reference surface ring (154) has a radially parallel to the cutting surface (106) of the cutting ring extending annular surface and the exact axial position the cutting surface (106) of the cutting ring is determined when the cutting ring (IO4) by the cutting ring clamping device (152, 154 »156, 158) is stretched, this annular surface of the reference surface ring (154) is axially always reduced by exactly the same axial amount like the cutting surface of the cutting ring when removing the cutting ring (I04). 3. Cutting mechanism according to claim 2, characterized in that the reference surface ring (154) consists of one compensating spacer ring with axially directed and radially parallel to one another There is surfaces at opposite ends, these radially extending surfaces of the compensating spacer ring parallel to the cutting surface (IO6) of the cutting ring run and this compensating spacer ring (154) in the axial direction the exact axial position of the cutting surface (106) of the cutting ring when the cutting ring is tensioned by the cutting ring clamping device (152, 154, 156, 158) determined 4. Cutting mechanism according to claim 1, characterized in that that the reference surface ring (154) consists of a 409831/0320 compensating spacer ring with axially directed and radially parallel to one another Faces at opposite ends, these radially extending faces of the compensating Spacer ring run parallel to the cutting surface (106) of the cutting ring, this compensating spacer ring (154) the exact axial position of the cutting surface (IO6) of the cutting ring in the axial direction Tension of the cutting ring determined by the cutting ring tensioning device (152, 154 »I56, 158) and the compensating spacer ring (154) always has exactly the same axial thickness as the cutting ring (I04) other Cutting surface (1O6) " 5 · Cutting mechanism according to one of the preceding claims, characterized in that the cutting ring clamping device (152, 154 »156, 158) the cutting ring (104) so tensioned that it is held immovable in its position, while the waste ring (I64) through the Cutting ring and trimming knife is cut o Cutting device according to one of the preceding claims, characterized in that the trimming knife clamping device (120, I48) the trimming knife (108) tensioned so that the cutting surface (11O) of the trimming knife assumes a precisely defined axial position, and a lid (I48) with one of the trimming - 64 - 409831/03 20 (, </ 240H74 knife (108) has associated reference surface, the is designed and arranged so that the cutting surface (110) of the trimming knife despite removal of the trimming knife (108) and axial reduction of the The cutting surface (HO) of the trimming knife is always reinstalled in exactly the same axial position will. 7ο Sohneidmechaniemus naoh claim 6, characterized in that that the son's oath surface (110) of the bee's oath knife extends around the circumference of the son's oath (108) extends and the trimming knife clamping device (120, 148) clamps the trimming knife (108) so that that it is its own, radially outwardly from a central axis of the can body (44) Axis can rotate while the waste ring (I64) is through the son's ring and the trimming knife are separated. 8. Cutting mechanism according to one of the preceding claims, characterized in that the cutting device (120, I48) has an axially extending Beεohne cutter frame (122) which the besohne knife (108) is stretched, as well as Means for storing this bespoke knife frame (122) in such a way that an axis can be moved radially outward and inward, whereby the trimming knife (108) between its inner 409831/0320 Entrance division and outer trimming position taken and the trimming knife frame (122) and the trimming knife (108) at least if the Trimming knife (108) is in the outer trimming position, in the circumferential direction around a central axis the can body (44) to be trimmed can be rotated, further characterized in that that the drive (112) with the trimming knife frame (122) is in operative connection to the trimming knife frame (122) and the dressing knife (10J3) at least if the dressing knife (108) is in the outer trimming position is located in the circumferential direction around the center axis of the to be trimmed Can body (44) too. turn, and further marked daduroh, that a curve (130) with the trimmer frame (122) is in operative connection to the movement the trimming knife frame (122) and the trimming knife (108) between the inner retracted position and outer trimming position of the trimming knife and the trimming knife during its rotation in the circumferential direction around the center axis of the can body in the outer trimming position to hold, and has a cam ring with a radially naoh inwardly directed cam surface, with a Cam roller (128) rests radially on the outside of this cam surface (130) and with the trimming knife frame (122) is in operative connection to the movements of the trimming knife frame (122) and the trimming knife (108) during the relative movement between this cam roller (128) and the cam surface (I30) of the cam ring to lead. - 66 - 409831/0320 Le he