Device for joining the payed-out end of a strip, which has been wound into a reel, with the beginning of the strip of another reel

A device, especially for cigarette-packaging machines, for joining the payed-out end of a strip, which had been wound into a reel, with the beginning of the strip of another reel. The device includes a buffer or storage device in which a certain length of the strip, which is conveyed over guide rollers, is stored, and out of which that amount of strip which is required for continuous operation is withdrawn during the joining process. The device is also provided with a separating and binding device. In order to provide for replacement of reels in a disturbance-free and semi- or fully-automatic manner at little structural expense, each reel is disposed in a cartridge on the wide sides of which the reel is mounted by means of a spindle which passes through the reel core and extends laterally out of the cartridge. The cartridge is provided with a support surface for the strip beginning of the reel, which is secured against rotation during transport of the cartridge; the strip beginning is held firmly in place on the cartridge. Specific embodiments of the cartridge and of the associated separating and binding device are also provided.

BACKGROUND OF THE INVENTION 
The present invention relates to a device, especially for 
cigarette-packaging machines, for joining the payed-out end of a strip, 
preferably a thin sheet of aluminum, paper, coated paper, plastic, or 
cellophane-like material, which had been wound into a reel, with the 
beginning of the strip of another reel. The device includes a buffer or 
storage device in which a certain length of the strip, which is conveyed 
over guide rollers, is stored and out of which that amount of strip 
necessary for continuous operation is withdrawn during the joining 
process. The device is also provided with a separating and binding device. 
Devices for joining the tail end of a payed-out strand of material with the 
front end of a new strand are known, for example for cigarette-packaging 
machines. For example, German Pat. Nos. 1 141 848 and 1 250 229 show 
unwinding devices with which it is possible to switch a payed-out reel for 
a new strand reel without having to reduce the speed with which the strand 
is unwound. Due to the high output of the packaging machines, which must 
be supplied with strands or strips which are wound into reels, is 
necessary to frequently replace the reels. This replacement of the heavy 
reels is a burden on the operators, who have to be available for this 
purpose with each cycle. Threading the newly placed end of the thin sheet 
requires care and accuracy on the part of the operators if no breakdowns 
are to occur during the replacement of empty reels for available fill 
reels. 
Numerous attempts have been made to carry out the replacement of the reels 
in a semi- or fully-automatic manner. Apart from the disturbances which 
occur during replacement of reels, the heretofore proposed constructions 
have the drawback that two reel-unwinding devices must be present for each 
strand; these devices not ony require a lot of space, but they also 
obstruct accessibility, especially with multi-strand or track machines. 
It is an object of the present invention to avoid the drawbacks of the 
heretofore known devices for joining the payed-out end of a strand, which 
has been wound into a reel, with the beginning of the strip of a new reel, 
and to provide a device which, with little structural expense, makes it 
possible to rep1ace reels in a semi- or fully-automatic manner without 
encountering disturbances or interruptions.

SUMMARY OF THE INVENTION 
The device of the present invention is characterized primarily in that each 
reel is disposed in a cartridge, on the wide sides of which the reel is 
mounted by means of a spinde which passes through the reel core and 
projects laterally out of the cartridges; furthermore, the cartridge is 
provided with a support surface for the beginning of the strip of the 
reel, which is secured against rotation during transport of the cartridge, 
with the strip beginning being held firmly in place on the cartridge. 
As a result of the proposal of the present invention, it is no longer 
necessary to have to provide space for two reel-unwinding devices for each 
track of the packaging machine. The reels can be disposed in the cartridge 
in a chamber which is removed from the packaging machine, and can be 
prepared for the reel replacement by having the beginning of a strip held 
in position on the inventive support surface of the cartridge. 
During replacement of the cartridge, and the joining of the payed-out end 
with the beginning of a strip of a new reel, the strip necessary for 
continuous operation of the packaging machine is withdrawn from the 
storage device which, after the cartridge replacement has been carried 
out, within a very short time, for example one minute, is again filled 
during the normal feed of the reel. Finally, due to the inventive 
cartridge, damage to the reels, which are in part very sensitive, is 
precluded. Furthermore, the operators along the packaging line are 
relieved, and disturbances caused by incorrecty threaded ends of the thin 
sheets are prevented. The advantages obtained, especially for multi-track 
packaging machines, that considerably less space is required for 
replacement of the reels, and that therefore the accessibility is 
improved, especially since not only a semi- or fully-automatic feed of the 
cartridges which are filled with reels, but also a semi- or 
fully-automatic withdrawal of the empty cartridges is possible, as a 
result of which the operator is relieved and the efficiency of the machine 
can be increased. 
Pursuant to one preferred specific embodiment of the present invention, the 
cartridge is embodied as a parallelepipedal housing having an open top 
and, in alignment with the open top, is provided with a projecting portion 
which extends beyond the adjacent narrow side and on which the support 
surface for the beginning of a strip is provided. In order to firmly hold 
the reels in place on the cartridges during transport, it is possible to 
either provide the bottom of the cartridge with an arcuate recess as the 
support surface for the full reel, or the spindle of the reel can be 
secured to the wide sides of the cartridge. 
Pursuant to a further preferred embodiment, expanding elements are provided 
in the spindle for connecting the spindle with the reel core. The spindle 
may be secured in position by means of levers on the side walls, so that 
the reel is prevented from falling out during transport of the cartridge 
by means of the spindle. 
It is inventively possible to provide at least two spacer rings on the 
spindle for axially securing the reel on the spindle, and/or the spindle 
in the cartridge. 
lt is furthermore inventively proposed to provide the spindle with a brake 
or friction disk for preventing rotation and/or for braking during 
withdrawal of the strip. Such a disk increases not only the friction 
surface for securing the reel during transport of the cartridge, but also 
provides the possibility of precisely braking the reel during withdrawal 
of the strip from the cartridge. 
So that the reel, which during transport of the cartridge is secured 
against rotation either by resting in a recess of the cartridge or by 
being secured by the brake or friction disk, can freely rotate in the 
operating position of the cartridge, the spindle can be lifted into a 
roll-off position within the cartridge by means of two pairs of lift-out 
rollers which, in the operating position of the cartridge, engage parts of 
the spindle located externally of the cartridge. In this roll-off 
position, the spindle rests only on the total of four rolers of the two 
pairs of lift-out rollers, so that no abrasion occurs between the rotating 
spindle and the cartridge. 
Pursuant to another preferred embodiment of the present invention, the 
beginning of the strip of the reel is secured by a hold-down device which 
presses against the support surface of the cartridge. The hold-down device 
can be swung away for insertion of the strip beginning. 
Pursuant to a further possible embodiment of the present invention, the 
strip beginning of the reel, which is conveyed over a guide roller, can be 
secured by finger-like retainer springs on support projections which are 
spaced from one another and which are provided next to one another on the 
projecting portion of the cartridge. With this embodiment, welding or 
pressure punches can be inserted between the support projections and the 
retainer springs of the cartridge to weld or join together the strip 
beginning of the new reel with the overlapping strip end of the old rest. 
In order to achieve semi-automatic replacement of cartridges, the cartridge 
can, pursuant to a further feature of the present invention, be adapted to 
be fed to the separating and binding device by means of guide rails which 
contact the lower corners of the cartridge, and can be withdrawn from the 
separating and binding device after the reel has been payed-out. The guide 
rails for feeding and withdrawing the cartridge are preferably disposed at 
right angles to one another, so that the filled cartridges can be 
successively fed to the separating and binding device, and the empty 
cartridges can be individually withdrawn at right angles to this direction 
of feed. 
In order to allow replacement of the cartridges to be carried out 
fully-automatically, it is proposed pursuant to the present invention that 
each cartridge be provided with a carriage for an automatically controlled 
track arrangement which feeds to the separating and binding device the 
cartridges which are filled in a packing room, and withdraws the empty 
cartridges. 
The separating and binding device is inventively provided with a base or 
anvil on which one side of the payed-out end of the strip of an empty 
cartridge can be secured by means of a clamping mechanism, and of which on 
the other side, which faces the cartridge, can be severed by a knife or 
doctor bade. The anvil is also provided with a bridge for joining the 
strip beginning of the reel, which is disposed in a new cartridge which 
has replaced the empty cartridge, with the band end which is secured on 
the anvil. This embodiment of the separating and binding device allows a 
fully-automatic joining of the payed-out end of a reel with the strip 
beginning of a new reel. In this connection, it is possible to either 
flushly abut the beginning and end of the strips and to join them by means 
of an adhesive tape or the like, or to overlap the strip end and beginning 
and to join or weld them together in the region of the overlap. 
Pursuant to another preferred embodiment of the present invention, a roll 
of adhesive tape is disposed transverse to the longitudinal direction of 
the strip. A carriage provided with needles horizontally withdraws the 
adhesive tape in conformity to the width of the thin sheet. Upon lowering 
of a punch, the adhesive tape is first cut off, and this portion of the 
tape is then pressed onto the available end and beginning of the strips in 
order to join them. 
Pursuant to a further possible embodiment, the bridge is embodied as a 
guide for an adhesive tape which extends transverse to the longitudinal 
direction of the strip, and which is applied at least partially by means 
of a punch onto the end and beginning of the strips. This joining of the 
flushly abutting end and beginning of the strips can be advantageously 
improved if the punch only punches out portions of the adhesive tape and 
applies them to the end and beginning of the strips, because in this way 
the adhesive tape, which is provided with punched-out portions, can be 
continuously withdrawn, for example from a roll, so that the feed and 
conveying of the adhesive tape are simplified. 
lf the strip end is to be joined with the strip beginning by means of an 
overlap, it is proposed pursuant to the present invention that an 
extensible loop-forming roller be disposed on the anvil, and that the 
bridge or carriage be provided with a suction pick-up element which is 
movable in the longitudinal direction of the strip, and which, after the 
strip end is severed when the loop-forming roller is extended, places the 
thus formed overlap material over the strip beginning of the available 
cartridge when the loop-forming roller is retracted. A joining of the 
beginning and end of the strips can now be effected by means of the 
welding or pressure punch which is guided between the spaced-apart support 
projections of the cartridge. Where the strip material cannot be welded, 
it is possible to replace the welding process with an adhesion process if, 
for example, the beginning of the strip which is secured on the support 
surface of the cartridge is moistened with an activatable adhesive. 
DESCRIPTION OF PREFERRED EMBODIMENTS 
Referring now to the drawings in detail, the cartridge 1, which is 
illustrated in FIGS. 1 to 6 with the aid of one specific embodiment of the 
present invention, serves to receive a reel B of strip F, which is wound 
onto a reel core K, and is preferably a thin sheet of aluminum, paper, 
coated paper, plastic, or a cellophane-like material. Such strips F are 
used, for example, in cigarette-packaging machines, where it is necessary, 
for the continuous packaging process, to join each payed-out end of the 
strip F, which is wound into a reel B, with the beginning of the strip of 
a new reel B. During this joining process, the strip F which is required 
for the continuous packaging process is dispensed from a buffer or storage 
device in which a certain length of the strip F, which is conveyed over 
guide rollers, is stored. Since this situation is known, it has not been 
illustrated in the drawings. 
The exemplary cartridge 1 shown in FIGS. 1 to 6 is embodied as a 
parallelpipedal housing having an open top, a bottom 1a, two wide sides 
1b, and two narrow sides 1c. The reel B is supported in the cartridge 1 by 
means of a spindle 2 which can be introduced from above into facing slots 
in the wide sides 1b of the cartridge 1. As can be seen from the sectional 
views of the spindle 2 in FIGS. 4 and 6, at least two expanding elements 
2a are disposed in the spindle 2. The expanding elements 2a can be 
pivoted, counter to the force of a tension spring 2b, by an expansion cone 
2d, which can be shifted by means of an adjusting screw 2c, in such a way 
that they rest inwardly on the reel core K, which is preferably made of 
cardboard, in order to keep the reel core from turning on the spindle 2. 
It would also be possible to actuate the expanding elements 2a 
pneumatically. In order to axially fix the position of the spindle 2 
within the cartridge 1, the spindle 2 is provided with a fixed spacer ring 
2e against which the reel core K rests when the reel B is placed on the 
spindle 2. By means of a spacer ring 2f which can be put on subsequently, 
the reel core K is kept from sliding axially off the spindle 2. This 
spacer ring 2f could also be fixedly arranged on the spindle 2 next to the 
spacer ring 2e and at a distance therefrom which corresponds to the 
thickness of the wall of the cartridge 1. 
In order to prevent the spindle 2, and hence the reel B, from falling out 
of the cartridge 1 while the latter is being transported, levers 1d are 
pivotably mounted on the wide sides 1b of the cartridge 1. The free ends 
of the levers 1d are equipped with pressure rollers 1e which in the 
functional position of the levers 1d press upon the spindle 2 which has 
been inserted into the cartridge 1, thus firmly holding the spindle 2 in 
place in the slot of the cartridge 1. This is best shown in FIGS. 1 to 6, 
with FIG. 6 showing how the spacer rings 2e and 2f, which are disposed 
within the cartridge 1, i.e. between the wide sides 1b, prevent the 
spindle 2 from axially sliding out of the cartridge 1. the levers 1d are 
preferably spring loaded, with the springs not being illustrated in the 
drawings in order to facilitate illustration. 
In order to prevent the reel B from turning within the cartridge 1 when the 
latter is being transported, the bottom 1a of the cartridge 1 can be 
provided with an arcuate recess as a support surface for the full reel B. 
Furthermore, as is the case with the embodiment illustrated in FIGS. 1 to 
6, it is possible to rigidly secure the reel B on the wide sides 1b of the 
cartridge 1 during transport of the latter via the spindle 2, which is 
rigidly connected with its reel core K. In this embodiment, the spindle 2 
is provided with a brake or friction disk 2g which, in the transport 
position of the reel B within the cartridge 1, rests on a section of a 
brake ring 2h which is provided on the outside of one of the wide sides 1b 
of the cartridge 1. 
In alignment with the open top, the cartridge 1 is provided with a 
projecting portion 1f which projects beyond the adjacent narrow side 1c 
and is provided with a support surface 1g for the beginning of the strip 
F. In the embodiment illustrated in FIGS. 1 to 6, the beginning of the 
strip F is conveyed over a guide roller 3 which is adjacent to the 
projecting portion 1f, and is held firmly in place on the support surface 
1g by means of a comb-like hold-down device 4 which is spring-loaded, the 
spring not being shown. This comb-like and spring-loaded hold-down device 
4 is omitted in the plan view of FIG. 2 in order to facilitate 
illustration. 
ln order to feed the cartridge 1, which has been filled with a new reel B, 
as shown for example in FIG. 1, to a packaging machine, such as a 
cigarette-packaging machine, a semi-automatic apparatus can be used, such 
as the embodiment illustrated in FIGS. 7 and 8. These figures show guide 
rails 5 and 6, which engage the lower corners of the cartridge 1. The 
guide rails 5 feed the cartridges 1 which have been provided with new 
reels B to a separating and binding device 10. The guide rails 6, which 
extend at right angles to the guide rails 5, are primarily provided for 
withdrawing cartridges 1 which are provided with an empty reel core K 
after the end of the strip thereof has been secured on the separating and 
binding device 10. In the embodiment illustrated in FIGS. 7 and 8, the 
full cartridges 1 are fed as a result of a slope of the guide rails 5, and 
the empty cartridges 1 are withdrawn by hand by means of the guide rails 
6. As indicated in FIG. 8, bearing rollers can be disposed in the guide 
rails 5 and 6 in order to reduce the friction. 
FIG. 8 also shows a modified embodiment of the cartridge 1. In place of a 
comb-like hold-down device as shown in FIGS. 1 to 6, a roller 7 which 
resiliently presses against the guide roller 3 is utilized. The 
construction and operation of the separating and binding device 10 will be 
described subsequently. 
In place of the semi-automatic feed and withdrawal of the cartridges 1 to 
the separating and binding device 10, a fully-automatic apparatus can also 
be used, as illustrated with the aid of the embodiment of FIGS. 9 and 10. 
As can be seen in particular from the side view of FIG. 9, with this 
embodiment each cartridge is provided on one narrow side 1c with a 
carriage for an automatically-controlled track arrangement 9 which feeds 
the cartridges 1 in a vertical direction to the separating and binding 
device 10, and withdraws them in the opposite direction thereto. Upon 
demand, cartridges 1 filled with full reels B are brought via this track 
arrangement from a holding position to the separating and binding device 
10, in which the beginning of the strip F, which is secured on the support 
surface 1g, is automatically glued or welded to that end of the previous 
reel B which is secured in the separating and binding device 10. When the 
strip F which is wound-up on the reel core K is used up by the following 
packaging machine, the empty cartridge 1 is automatically separated from 
the production flow in response to the control signal of a sensor, and is 
withdrawn from the separating and binding device 10 via the vertically 
rising portion of the track arrangement 9. By means of a siding or branch 
line, which can be seen in the plan view of FIG. 10, the empty cartridges 
1 reach a return track, so that a filled cartridge 1 can be fed to the 
separating and binding device 10. 
In order to release the brake or friction disk 2g of the spindle 2 while 
withdrawing the strip F, and in order to avoid abrasion between the 
rotating spindle 2 and the cartridge 1, pairs of lift-out rollers 11 are 
provided not only for the semi-automatic embodiment of FIGS. 7 and 8, but 
also for the fully-automatic embodiment of FIGS. 9 and 10. In the 
operating position of the cartidge 1, the pairs of lift-out rollers 11 
lift the spindle 2 of the cartridge 1 into a roll-off position within the 
cassette. The lift-out rollers, which are disposed against movably 
controlled push rods 11a, engage portions of the spindle 2 located 
externally of the cartridge 1 to lift the spindle 2, along with the reel B 
mounted thereon, against the force of the levers 1d. In this way, during 
withdrawal of the strip F, the spindle 2 is rotatably mounted on the pairs 
of lift-out rollers 11 with minimum friction. While the reel is being 
unwound or payed-out, the tension in the strip F is kept constant by means 
of a braking device which acts on the brake or friction disk 2g. 
FIGS. 11 to 16 illustrate on specific embodiment of the separating and 
binding device 10 in various operating positions. This separating and 
binding device 10 is provided with a base or anvil, on the top side of 
which the end F.sub.e of the strip F which is being payed-out is clamped 
by means of a clamping mechanism 13, as shown in FIG. 11. Subsequently, 
the payed-out end F.sub.e is severed on that side which faces the 
cartridge 1 by means of a knife or doctor blade 14. As shown in FIG. 12, 
the knife 14 interacts with a cutting notch which is provided in a bridge 
15. 
As illustrated in FIG. 13, after the remainder of the strip F has been 
severed from the strip end F.sub.e, the bridge 15 is shifted toward the 
clamping mechanism 13, so that the empty cartridge 1 can be removed from 
above in the direction of the indicated arrow. The empty cartridge is 
replaced by a new cartridge 1 which has a full reel B, as shown in FIG. 
14. The beginning of the strip F.sub.a of this cartridge 1 is clamped onto 
the projecting portion 1f of the cartridge 1 in the manner previously 
described. As indicated by the arrow in FIG. 14, the bridge 15 is now 
moved halfway over the clamped strip beginning F.sub.a. After the bridge 
15 has been lowered (FIG. 15), half of it rests on the beginning of the 
strip F.sub.a, and the other half of it rests on the end of the strip 
F.sub.e which is clamped onto the anvil 12. A puch 16 which is disposed 
above the bridge 15 is now lowered. This punch 16 cuts an adhesive strip 
out of an adhesive tape L located in the bridge 15, and presses this 
adhesive strip through an aperture in the bridge 5 in such a way that half 
of it is disposed on the band end F.sub.e and of it is disposed on the 
beginning of the strip F.sub.a, as shown in FIG. 15. In this way, the 
strip beginning F.sub.a, which is flush against the band end F.sub.e, is 
joined therewith. After the bridge 15 and the punch 16 have been lifted 
from the anvil 12, the band F which is wound onto the reel B of the new 
cartridge 1 can now be used. To prepare for a subsequent splicing or 
joining process, the punched-out portion of the adhesive tape L is wound 
onto a non-illustrated roller, so that for the next punching operation of 
the punch 16, a new section of the adhesive tape L, which is preferably 
wound onto a roller, is available. 
FIGS. 17 to 20 illustrate an alternative embodiment for the separating and 
binding device 10. In this embodiment, in place of the bridge 15 a 
carriage 17 is provided which can be moved on a guide rod 18 of a frame 19 
transverse to the direction of travel of the strip F. A punch 21, the 
height of which can be adjusted via a rod 20, is disposed on the carriage 
17. The bottom of the punch 21 is provided with a plurality of transfer 
needles 21a. When the punch 21 is lowered, these transfer needles 21a are 
pressed into a portion of the adhesive tape L, which in the embodiment of 
FIGS. 17 and 18 is mounted in roll form on the frame 19. 
After the transfer needles 21a have been pressed into the adhesive tape L, 
the carriage 17 is moved out of its extreme right position, which is 
illustrated with solid lines in FIG. 17, into its extreme left position, 
which is illustrated with dot-dash lines in FIG. 17. In so doing, the 
punch 21 takes the adhesive tape L along with it, so that from the roll of 
the adhesive tape, a length of the adhesive tape L corresponding to the 
path of travel of the carriage 17 is payed-out or unwound. During 
subsequent lowering of the punch 21 by means of the rod 20, an edge of the 
punch 21 cuts that portion of the adhesive tape L which is held by the 
transfer needles 21a from the remainder of the adhesive tape L and presses 
the cut-off portion onto the strip end F.sub.e and the strip beginning 
F.sub.a, which are held firmly in place on the anvil 12 and on the 
projecting portion 1f of the cartridge 1 in the manner previously 
described. This can best be seen in FIG. 20. Furthermore, FIGS. 19 and 20 
show that the transfer needles 21a extend into appropriate apertures not 
only of the projecting portion 1f of the cartridge 1, but also of the 
anvil 12, so that the severed piece of the adhesive tape L can be reliably 
applied to the strip end F.sub.e and the strip beginning F.sub.a. 
Whereas in the previously described two embodiments, the separating and 
binding device 10 joined a strip end F.sub.e and a strip beginning F.sub.a 
which flushly abutted one another, FIGS. 21 to 24 show an embodiment with 
which the strip beginning F.sub.a, which overlaps the strip end F.sub.e, 
is welded or heat-sealed thereto. 
FIGS. 21 and 22 again show an anvil 12 onto which is firmly secured by 
means of a clamping mechanism 13 the strip end F.sub.e of a pay-out reel 
B. In the anvil 12, a so-called loop-forming roller 22 is mounted on a 
push rod 23 in such a way that the height thereof can be adjusted. As 
shown in FIG. 21, the roller 22 lifts the strip end F.sub.e, which 
originally rested flat on the top of the anvil 12, before the strip end 
F.sub.e is severed by means of a knife or doctor blade 24 which is 
pivotably mounted on the anvil 12 and cooperates with a knife edge 25a 
which is provided on a carriage 25. The carriage 25 is again mounted on a 
guide rod 25b in such a way that it can be moved in the longitudinal 
direction of the strip F. 
After the strip end F.sub.e has been severed, which is indicated in FIG. 21 
by dot-dash lines of the knife 24, the carriage 25 is shifted into the 
extreme position illustrated in FIG. 22. At the same time, the 
loop-forming roller 22 is retracted into the anvil 12. During the 
displacement procedure, the carriage 25 takes along the end of the strip F 
produced by the cutting process, for which purpose, in the presently 
described embodiment, it is provided with suction channels 25c which 
communicate with a vacuum-suction device. In this manner, the cut edge of 
the strip end F.sub.e passes over the strip beginning F.sub.a of a 
cartridge 1 which is provided with a full reel B, as illustrated in FIG. 
23. The strip beginning F.sub.a is securely held in place on the support 
surface 1g of the cartridge 1 by means of finger-like retaining springs 
26. This support surface 1g is formed by spaced-apart support projections 
1h, which can be seen in section in FIG. 24. 
The strip end F.sub.e, which overlaps the strip beginning F.sub.a (FIG. 
23), is now engaged by welding punches 27 which extend between the support 
projections 1h of the cartridge 1, and which press those parts of the 
strip beginning F.sub.a and of the strip end F.sub.e which are disposed 
between the finger-like retainer springs 26 against the underside of the 
carriage 25 and weld them together. The welded joint is indicated by a 
dotted line in FIG. 23. After the welding punches 27 have been withdrawn, 
and after the carriage 25 has been returned to its rest position as 
illustrated in FIG. 21, the strip F of the new cartridge 1 can be used. 
Naturally, the suction apparatus, which is operational via the suction 
channels 25c, is turned off while the strip F is being used. 
The present invention is, of course, in no way restricted to the specific 
disclosure of the specification and drawings, but also encompasses any 
modifications within the scope of the appended claims.