DE1173866B - Machine for the production of closure caps with elastic seal - Google Patents

Description

Machine for the production of caps with elastic seals The invention relates to a machine for continuously applying deformable Seals made of elastic material in closure caps for bottles or the like Containers, the tools arranged on a turntable for cutting out sealing elements from a supplied strip of deformable material and for introducing the Sealing elements in sealing caps, further tools for forming the seals in the caps and means for returning the waste strip of sealing material to a supply serving for the continuous formation of strips.

A machine of this type is known in which the cutting out the sealing elements, the introduction of the sealing elements into the closure caps and the seals are formed in one and the same place. This way of working has the disadvantage that it is too slow and that because of the various however, the work to be carried out at one point is very complicated and therefore very sensitive tools are needed.

Since such sealing caps provided with seals in extraordinary Manufactured in large quantities and used only once, each is a part of the manufacturing process achievable savings important and advantageous.

Thus, it is a purpose of the invention to introduce a machine of the introductory type that works quickly and economically.

Another purpose of the invention is to have such a machine to create simple and stable tools, so that even at high working speeds the reliability and a long service life of the machine are guaranteed.

According to the invention this is achieved in that a conveyor device is provided to remove the caps from the cutting tools to those of these To bring spatially separated molding tools.

An embodiment of the invention is characterized in that the molds are spaced around a second rotatable drive are and that the conveyor is stationary with respect to both turntables and has a guide part which extends across the outer periphery of the two turntables is arranged and the closure caps from a groove in the first turntable a groove in the second turntable when the grooves are closest to the point Approach of the turntables lie in the axial direction. In the drawings is an embodiment a machine according to the invention.

F i g. FIG. 1 is a schematic plan view of the main parts of FIG Machine; F i g. 2 is a side view of FIG. 1, Fig. 3 is a side view; partly in section, of a device for introducing the sealing element in the cap; F i g. 4 is a partial plan of the turntables for the punching and molds and the parts associated with the former; F i g. 5 is a floor plan similar to FIG. 4 omitting the upper parts of the device for illustration the path of the caps in the device; F i g. 6 is a horizontal one Section through the turntables for the punching and compression molds and the control cams for the latter; F i g. 7 is a horizontal section through the drive device for the turntables; F i g. 8 is a vertical section through part of the turntable with the die during manufacture of the sealing element; F i g. 9 is a Section similar to FIG. 8 with the die open and with the one on one of the molded parts held annular sealing element and the traced back to the strip of material middle scrap washer of the sealing element; F i g. 10 is a vertical section, which illustrates the sealing rings inserted into the closure cap; F i g. Figure 11 is a vertical section through the press turntable with the dies closed; F. i g. 12 is a section similar to FIG. 11 with the molds open and with the molded seal in the closure cap; F i g. 13 is an enlarged section Scale showing the introduction of the seal into the closure cap; F i g. 14 is a section similar to FIG. 13, showing the deformation of the seal in the cap represents; F i g. 15 is a partial view of the spring plates for controlling movement the otherwise fixed forms; F i g. 16 is a vertical section through the Turntable for the compression molds with the toggle mechanism for actuating the movable ones Molding tools; F i g. 17 is a side view of the FIG. 15 illustrated springs and their connection with the molds; F i g. 18 is a section similar to FIG i g. 16, but in the effective position of the toggle mechanism; F i g. 19 is a plan view of part of the toggle mechanism, the mounting on the turntable illustrates; Fig. Fig. 20 is a side view of a toggle mechanism and its Connection with the mold; F i a. 21 is a side view of a quick acting Ejector device; F i g. 22 is a side view, half in section, of the upper part of a vessel with a closure cap and a seal according to FIG Invention on the vessel; F i g. 23 illustrates in a vertical section the flow of the material of the sealing element through part of the mold against the edge of the closure cap and downwards under the action of the ram; F i g. 24 is a perspective view of a closure cap half with FIG seal distributed over its entire inner surface; F i g. 25 is a vertical one Section through the turntable with the molding tools in FIG. 3 shown device including the toggle mechanism for actuating the movable molded part; F i g. 26 is a section through part of the device of FIG. 25 in the Pressing position of the molding tools; F i g. 27 is a section through a closure cap with a sealing element attached to its inner surface; F i g. 28 is a vertical section through the turntable for the compression molds with the toggle mechanism and other parts of the FIG. 3 device shown; F i g. 29 is a Section through part of the device according to FIG. 28 with the mold tools open.

A machine according to the invention is shown schematically in FIG. 1 and 2 as well as in FIGS. 3, 4 and 5 of the drawing.

In addition to a corresponding frame or support frame, it has a hot rolling mill M with rollers 22 and 23, a turntable A with a number of punching dies arranged in a circle, consisting of coaxial parts 51 and 52, which can be automatically opened and closed when the turntable A rotates, and a turntable B with a number of molds or molding tools arranged in a circle, consisting of parts 160 and 166, which are also automatically opened and closed when the turntable B rotates. Furthermore, a closure cap feed device F is provided with a feed channel 136, from which the closure caps C are individually guided with upwardly directed inner side in radial grooves 141 on a plate 140 on the turntable A, with which they move forward , guided by guides 138 and 139 , until they pass through a curve piece 146 into the space between two open cooperating punched parts 51 and 52 and receive the blank 111 of the mass to be deformed to form a seal.

The caps C with the blanks 111 continue to move with the turntable A until they engage a cam member 153 which guides them radially outwardly along the grooves 141 and in grooves 155 of the plate 140 of the turntable B between the cooperating dies 160 and 166 transferred, which are moved against each other and compressed, so that the blank 111 is pressed and the seal is formed. When the caps C with the molded seals 111 reach the exit point during the rotation of the turntable B, they meet a cam part 185 which guides them along the grooves 155 outwards onto a guide channel 186 , from where they are collected for further treatment under controlled temperature conditions can be. If the nature of the sealing material requires vulcanization, the caps C can fall from the chute 186 onto a conveyor device 187 , on which they are guided through an after-treatment furnace O.

From a supply 20 between rollers 22 and 23 , a web of moldable sealing compound is formed on roller 22 , and from this, by knife 46, an endless strip 44 of heated sealing material, which is slightly wider than necessary, is cut around blank 111 for the seal to be formed and which has the desired strength. The strip 44 is conducted away from the mill M, b optionally via a Anfeuchtdocht 49 and rollers 47 and 47a and then in the opposite direction over a roller 47 so that it passes between the cooperating die members 51 and 52 which close on it and Punch out a certain amount of the sealant from which the seal is to be made. The strip 44 follows the revolving movement of the punching dies 51-52 so far that several are always in engagement with it at the same time and each take it along over a short distance. As will be explained in more detail below, when the cutting dies 51-52 are opened, the blank 111 is retained in the form 51 , while the strip 44 can move further after being released through the shaped parts 51, 52 and via a ratchet 47d and conveyor rollers 47e to the Rolling mill M is returned, where it mixes with the material supply 20 and is used again to form streaks. After the strip 44 has left the molds 51, 52 , the caps C located on the plate 140 are guided individually at a certain point by the cam 146 into the space between the mold parts 51 and 52 , whereupon the mold parts 51, 52 are actuated that the sealing blank 111 is brought onto the inner surface of the cap C by the molding 51.

When equipping a type of cap, e.g. B. a crown capsule for beverage bottles, a disk-like blank 111 'is placed on the capsule C, as shown in FIG. 27 is shown. In another cap shape, e.g. B. a cap C with a side seal according to FIG. 22, the blank is designed as a ring 111, and when the ring 111 is punched out by the molded parts 51 and 52, the disc 110 lying within the ring 111 is temporarily retained by the molded part 51, but is removed before the ring 111 is applied to the cap C. Since the disc 110 is to be reused by being returned to the supply 20 , it is ejected from the molded part 51 while the strip 44 is still under it and pressed against the strip 44 with such pressure that it adheres to it and with it it returns together to the supply 20 , as in FIG. 1 is shown.

Of course, the rolling mill works continuously, and likewise the turntables A and B also run continuously, so that in uninterrupted sequence Closing caps are made with molded seals on the underside.

Although the machine shown here has proven to be satisfactory in use and has proven to be useful, but within the scope of the invention it can be different Way be structurally designed differently. The following description of the individual parts accordingly only relates to one embodiment.

The rollers 22 and 23 can be slidably mounted in side frames 25 Have bearing blocks 24, so that the space between the rollers 22, 23 accordingly the desired strip thickness is adjustable. The rollers 22, 23 can be hollow, so that they can be heated or cooled to the temperature of what is on it To influence the material. The rolling mill M is an electrical or other Drive motor driven.

The rotating turntables A and B, which may have channels 89 (Fig. 8), are mounted on vertical shafts 56 and 156 (Fig. 7) and have meshing gears 57 and 152 so that they move rotate together and in opposite directions. The toothed wheel 57 is driven by means of a pinion 58 from a reduction gear 59, the shaft 61 of which is connected to the chain wheel 63 via a chain 64 with a drive device. A clutch 190 is used to switch off the shaft 61 from the reduction gear 59 so that the drive motor can actuate the rollers 22, 23 of the rolling mill M when the turntables A, B are stationary, in order to heat the sealing material on the rolling mill M beforehand. The clutch 190 is actuated by an angle lever 197 ' , from which a handlebar 191 leads to a suitable operating point.

The turntables A, B can be rotated by hand for monitoring, testing and repairing by means of a removable crank 189 which can be plugged onto a shaft 192 held in bearings 193 . The connection to the shaft of the reduction gear is made via a chain 197.

The turntable A has a groove-like annular space 72 which is delimited by an upper flange 74 and a lower flange 75. In the flanges 74, 35 there are coaxial bores 76 and 84 in a circular distribution. The flanges 74 and 75 also receive the stamped parts 51 and 52. The strip 44 moves through the annular groove 72 into a position in which it is gripped by the molded parts 51 and 52 when these close for punching out a blank 111. In the case of the FIGS. 8, 9 and 10 each mold part 51 has an outer and an inner cylindrical knife 78 and 80, which are mounted in holders 79 and 81 and punch a ring 111 of sealing material which is held between the knives 78, 80 during the strip 44 is supported on the upper side 92 of the molded part 52 (FIG. 8). At the same time, the knife 80 punches a circular disc 110 from the strip 44 , which is held in the molded part 151. A plunger 130 on a bumper 128 is actuated by a rocker arm 122 (FIG. 21) so that it ejects the disk 110 from the molded part 51 and presses it onto the strip 44 (FIG. 9) when the latter is over a support plate 120 moves. The plunger is withdrawn by a spring 131. When the molded part 51 carrying the ring 111 reaches the position in which a cap C has reached the base 88 of the molded part 52, a cam 134 on the holder 135 actuates pressure pins 133 of an annular ejector 137 (FIG. 10), the presses the ring 111 into the cap C against the action of a spring 137 '. The molded part 52 contains a ram 90 sliding in a sleeve 86, which is connected by means of a transverse bolt 94 to the drive link of a toggle lever mechanism to be explained in more detail, which is actuated by corresponding cams so that it moves the molded part 52 upwards against the molded part 51, to punch out the blank 111.

The flange 75 of the turntable A has a radially projecting table 140 which can consist of one piece or, as shown here, of a number of segments (FIG. 5). Grooves 141 with a radial wall 144 are provided in the table, which lead from the edge of the table 140 to the space between the molded parts 51, 52, so that a cap C is guided from the table 140 onto the base 88 of a molded part 52 can before the mold parts 51, 52 are actuated.

Since the strip 44 is in motion at the point in time at which the disc 110 is pressed against it by the pressure of the plunger 130, the plunger 130 must be moved quickly. For this purpose (FIG. 21) the rocker arm 122 acting on the push rod 128 of the plunger 130 is pivotably mounted at 123 on a holder 124 fastened to the machine frame and has a stop 125 which has a number of rollers 126, namely one for each die 51-52, comes into engagement. The rollers 126 are arranged so that when one of them hits the stop 125, the rocker arm 122 quickly hits against the push rod 128 and pushes it downwards until the push rod 128 comes to the cut-out part 122 ', whereupon the pressure of the push rod 130 against the disc 110 is canceled. When the roller 126 has moved past the stop 125, the rocker arm 122 is raised by its spring 127 . In order to avoid damage when the turntable A rotates in the opposite direction, the stop 125 at 132 can be freely pivoted against the action of a spring 129. When the stop 125 is actuated in the intended direction, a lug 125 'rests against the rocker arm 122 and moves it properly.

F i g. 5 shows the guide device for the caps C, which has a guide channel 136 with a protruding wall 136 a for inserting the caps C into the radial grooves 141. The latter have wedge-shaped walls 142 in order to facilitate the entry of the caps C into the grooves 141. Furthermore, an inner guide 138 and an outer guide 139 are provided, between which the flange of each cap C is guided in order to hold them on the outer part of the table 141 until they are guided by the cam 146 into a position in which they on the base 88 of the molded part 52 rests. At the entry end of the guide 139 an adjustable extension 145 is provided which guides the cap C into the correct position in the event that it migrates outwards. On the other hand, the guide 139 carries an adjustable guide piece 148 which defines the exact position in which the cap C is guided by the cam piece 146. The transfer device 151 is located on a holder 154 (Figs. 4 and 5) and has a guide surface 153 which extends over the adjacent edges of the plates 140 of the turntables A and B so that the cap C with the gasket blank 111 from the Groove 141 crosses outward into groove 155 of turntable B and comes into a position between molded parts 160 and 166. The guide 185 provided at the exit point of the turntable B moves the caps C with the molded seals outwards along the grooves 155 until they reach the drainage channel 186.

The turntable B has a groove-like annular space 157 with upper and lower flanges 158 and 159 (FIG. 11). The molded part 160 is located in the upper flange 158, while the molded part 166 is accommodated in the lower flange 159. The molded part 166 mounted on a piston 170 has a head 168 which conforms to the outer surface of the cap C and supports it during the molding of the seal 111. When the cap C slides through the guide groove 155 between the mold parts 160, 166, the head 168 is below the plane of the guide groove 155, and the cap C comes onto a support block 171 with a pressure pin 173. The pressure pin 173 is in the raised position (F i g. 12) held by a plunger 175, one end 178 of which extends through a slot 176 and is moved by a cam 180. As the table B moves further, the support block 171 is retracted by the action of a spring 177 so that the cap C can fall into the cavity of the head 168. This arrangement prevents the cap C from sliding into the cavity of the head 168 and remaining in an impermissible inclined position. When the cap C comes into the position in which it is gripped by the guide 185, the support block 171 is raised by a guide piece 184 (Fig. 6), so that the cap C rises in the plane of the plate 140 and out the groove 155 is ejected into the channel 186. The lower end of the molding 160 is designed to give the seal 111 the desired shape, size and strength when it is in the form shown in FIG. 14 is brought together with her. The molded part 160 has a bevel 169 which, when the mold is closed, displaces the sealing material of the ring 111 in such a way that the space between the molded part 160 and the cap surface in the position shown in FIG. 23 is filled in both at the end and on the side of the form. As a result, an edge ring sealing cap C is produced, as it is for a vessel J according to FIG. 22 can be used. At the same time, a part of the molded part 160 lies against the upper edge of the cap flange and crimps it inwards against the seal 111, whereby the otherwise sharp outer edge is avoided. As soon as the molded parts 160, 166 open again, the cap C with the seal 111 is removed from the molded part 160 by means of an ejector 163 (FIG. 11). The ejector 163 is mounted longitudinally displaceably in a bore 161 and is actuated by a cam 164 against the action of a spring 165, so that the cap C comes onto the support block 171, which in the meantime for the purpose of removing the cap C from the cavity of the head 168 was raised.

If, as is often the case, the seal 111 consists essentially of a Thermoplastic is made up of molds 160, 166 and the wing of the cap C are heated so that they are more suitable for the deformation process.

The drive device for opening and closing the mold parts 160, 166 contains a toggle mechanism T which is shown in FIG. 16 to 20 is shown.

The upper mold parts 51 and 160 are practically fixed in their support flanges, while the lower mold parts 52 and 166 are movable to effect the opening and closing of the molds. The mold parts 52 and 166 are equipped with cross bolts 92 by means of which they are moved.

On the underside of the lower flange of each table A, B are fastened by means of bolts 96 toggle lever frames 97, each of which contains a flat slide 98. The sides 97 of each frame 97 are formed to extend radially from the turntable and close together with their edges under the heads of the bolts 96 which secure them to the turntable. A wishbone 100 with two bores 101 located at a distance from one another is attached to the slide 98 by means of a pivot pin 99. The outer end of the handlebar 100 is slotted, and in the slot there is a handlebar 102 with a pivot pin 95 embedded in the upper bore 101 and also a handlebar 106 with a pivot pin 105 embedded in the lower bore 101. The handlebar 102 is with the Cross bolt 94 is connected to the lower molded part, while the link 106 in the embodiment shown here is connected to a cross bolt 108 which is fastened in a holder extending downward from the frame 97. When the slide 98 is moved from the position shown in FIG. 16 to the position shown in FIG. 18 is moved, the control arms 102 and 106 connected by the wishbone 100 come into alignment with the longitudinal axes of the molds 51, 52, 160, 166 as well as with each other or slightly beyond, as a result of which the lower mold part 52, 166 is moved upwards so that it comes into effect, and remains in this position until some other force moves the slide 98 in the opposite direction.

The slides 98 are moved in and out by cams on the machine frame which engage rollers 103 of the slides 98 to close and open the molds 51, 52, 160, 166 at the appropriate time.

The slide 98 on the turntable A pass through the action of cam piece 104 in the mold closed position, which is impressed based on the curve segments 91 and 104 ', and subsequently in the mold open position under the action of the curved members 93, 107 and 117 to release the strip 44 and then back under the influence of the curve piece 147 into the mold closed position and finally through the curve pieces 149 and 115 into the mold open position (FIG. 6). The slides 98 on the turntable B are moved by cam pieces 181 and 182 into the mold closed position and by a cam piece 184 into the mold open position. An adjustable stop screw 85 on a holder 82 fastened to the toggle frame by screws 83 limits the inward movement of the slide 98. The advantages of the toggle mechanism T for controlling the mold movement are essentially the possibility of gradually increasing pressure when the molds 51, 52 are closed , 160, 166, as well as the ability to remain in the closed or locked position without the need for the cam 181 to be constantly engaged with the roller 103.

It has already been mentioned that the upper mold parts 51, 160 of each pair are practically fixedly attached to the turntable. In the case of the compression molded parts 160 of the FIG. 16 to 20, however, it is advantageous to make the molded part 160 elastically resilient when the molded parts join with the sealing blank 111 via the cap C , so that, despite the closing pressure pressing the molded parts against one another, the parts themselves do not break or damage if there is unusual resistance during this process. To this end, the molded part 160 is slidably disposed in the flange 158, and rib-like lugs 195 on the upper end are under the action of leaf springs 196 fastened to the flange by screws. The leaf springs are very strong and continuously press the molded parts 160 onto the intermediate located pressing piece, in case they could not complete about at the beginning of their movement.

A device which differs somewhat in details is shown in FIGS. 3, 25, 26, 28 and 29 in connection with a cap C of the type in which the seal 111 extends over the entire inner surface. F i g. 3 shows that the turntables A and B have flanges 74 and 75 or 158 and 159 for receiving the molded parts 51, 52 and 160, 166, which correspond to the corresponding parts of the embodiment according to FIG. 8 to 12 of a kind. The toggle gears T 'are, however, attached to sleeve-like extension rings A' and B 'of the turntables instead of the lower flanges 75 and 159, and apart from that, the design of the toggle gears T' is somewhat different from that in FIGS. 16, 18, 19 and 20.

In Fig. 25 and 28, in which the toggle mechanism T 'is shown in detail, the frame 97' carries a slide 98 'and is attached to the sleeve A' by bolts 96 'so that the slide 98' moves vertically when a The roller 103 'attached to it meets a cam piece 181' or 182 'provided on the machine frame. A toggle link 102 'is connected at one end to the punch 90' of the molded part 52 via a transverse bolt 94 ', while its other end is connected directly to the link 106' by means of a pivot pin 101 ', the other end of which is in turn connected via a pin 108' is connected to a stop bar 200. The handlebar 106 'has a further arm 201 with a roller 202', which is encompassed by a fork 203 attached to the slide 98 '. When the slide 98 'is moved from the position shown in FIG. 25 and 29 is moved upwards, the fork 203 pivots the handlebar 106 'in such a way that the toggle lever is stretched, whereby the punch 90' goes upwards and moves the molded part 52 against the molded part 51. Here the pins 94 ', 101' and 108 'come into alignment or slightly beyond (Figs. 26 and 28), so that the knee joint is locked and the molded part 152 is held in the operative position, even after the cam piece 181' has moved has released from the roller 103 'until the cam piece 182' unlocks the knee joint and the parts are back into the position shown in FIG. 25 and 29 returns the position shown.

To avoid damage to the parts if a mold 51, 52, 160, 166 is not properly closed, caused by the occurrence of a foreign body or by an incorrectly positioned cap in a mold, as well as to limit the pressure between the mold parts and the molding material located between them In the closed form, the pin 108 'is attached instead of a rigid support on the stop 200 , which in turn can slide in the frame 97'. The stop bar 200 is resiliently mounted by means of a helical spring 204 which rests against a pressure screw 205 ; this is located in a holder 206 which is attached to the lower end of the frame 97 '.

If, when the toggle link 102 ' and 106' is moved into the blocking position, the plunger 90 ' encounters excessive resistance, the stop bar 200 gives way downwards and compresses the spring 204. This state can last until the knee joint according to FIG. 26 and 28 is locked, meanwhile the upward pressure of the spring 204 against the stop and the knee joint stops with such a force as is regulated by adjusting the screw 205 . Any additional load acting on the knee joint, for example, is absorbed by further compressing the spring 204. The vertical movements of the knee joint, the stop bar 200 and the plunger 90 'under the action of the spring 204 are of course very small and are not impaired by the engagement of the fork 203 in the arm 201 of the handlebar 106', as in the locked position of the knee joint F i g. 26 and 28 a slight pivoting of the link 106 ' when the spring 204 is moved does not significantly increase the distance between the pins 94' and 108 '.

The blank 111 ', which according to FIG. 28 and 29 in molded part 51 is retained is a circular disc of such a diameter that in Considering the thickness of the strip 44 'of the blank 111 'in terms of volume Contains the correct amount of material to seal the inner surface of the cap 10 according to FIG. 24 to shape.

A stripping device assigned to each shape is used to strip the strip 44 ' from the molded part 51 and the cap C from the molded part 160. This consists of a plate 207 on a plunger 208, which is mounted in the upper flange of the turntable so that it can be moved longitudinally. A roller 209 is provided on the tappet 208 and moves along a cam piece 210 which is attached to a holder 211 fastened to the frame strut 212. As soon as the curve piece allows it, the plunger 208 slides downwards under the action of a spring and presses the strip 44 'in the sectional shapes according to FIG. 28 and 29 and the cap C in the molds according to FIG. 25 and 26 down against the associated mold parts while the mold parts 51 and 160 are separated until the strip 44 'and cap C are released therefrom.

At the predetermined point in time in the course of the working cycle, when the strip 44 'is removed between the molds and the cap C is inserted between them, an ejector rod 128' is activated by a correspondingly arranged cam piece against the action of a spring 131, which pushes the blank 111 ' from the molded part 51 into the position according to FIG. 27 presses on the cap C, to which it adheres due to its stickiness.

Claims (2)

Claims: 1. Machine for continuously applying deformable seals made of elastic material in closure caps for bottles or similar containers, the tools arranged on a turntable for cutting out sealing elements from a supplied strip of deformable material and for inserting the sealing elements in closure caps, further tools for Forming the seals in the closure caps and means for returning the waste strip of sealing material to a supply serving for the continuous formation of strips, since it denotes that a conveyor device (153) is provided to remove the closure caps (C) from the cutting tools (51 , 52) to the shaping tools (160, 166) which are spatially separated from them. 2. Apparatus according to claim 1, characterized in that the molding tools (160, 166) are arranged at a distance around a second rotatable drive (b) and that the conveyor device is fixed with respect to both turntables (A, B) and a guide part ( 153), which is arranged transversely over the outer circumference of the two turntables (A, B) and the closure caps (C) from a groove (141) in the first turntable (A) to a groove (155) in the second turntable ( B) can move when the grooves are in alignment near the point of closest approach of the turntables (A, B). Documents considered: German Patent No. 374 916; British Patent No. 412,602; U.S. Patent Nos. 2,471,255, 2,538,887, 2,548,304, 2,593,439.