RU2363648C2 - Reel and reel unit for winding of transporting tapes of packing chain fixed to tapes of overlapping located packets - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to reels for winding of gummed transporting tape with fixed to tape packets. Reel contains cylindrical core. Surface and walls of core are forming path, on which there are winded coils of tape. Additionally surface of core allows resilient facility in the form of dowels for radial pressure relief, acting on the first coiled turns of tape. Reel unit contains two transporting tapes and two reels. Between mentioned reels it is installed differential device.

EFFECT: decision is directed to increasing of number of tape turns excluding blocking or breakdown risk of reel.

23 cl, 11 dwg

Description

The invention relates to packet packaging and, in particular, relates to attached to the tape located overlapping packages. In particular, it relates to an improved bobbin, to a bobbin assembly (possibly installed in an appropriate cassette) for winding adhesive conveyor belts delivering a chain of overlapped packages.

For many years, a known method of packaging food products, such as packaged meat or poultry, in appropriate packages. Typically, packaging bags are transported to the loading station in the form of a chain of overlapping packages. Packages are constantly in this overlapping form and are delivered using a pair of adhesive tapes on one side. As a rule, tapes are wound on bobbins when the chain of packets goes to the loading station.

GB 2064477 discloses a device for dispensing packets attached to a tape, namely, a packet dispensing device from a packet chain connected together by an overlap on a pair of tapes. It is connected to a source of packages attached to the tape and to a device comprising: a reel for winding each tape, drive means for transmitting movement to a differential mechanism that imparts rotational movement to the reels, as a result of which the reels can rotate at different speeds to ensure substantially the same the tension of the two tapes and thus keep the bags in the aligned position. The sensor device detects the presence or absence of the package and is operatively connected to the drive means, which may contain an asterisk and a chain or a pneumatic cylinder.

The dispensing device according to GB 2064477 has the disadvantage that the differential mechanism is somewhat complicated, expensive and is made integral with the dispensing device. In addition, the operation of replacing a wound bobbin is quite complicated and requires considerable time. Therefore, there are long shutdowns of the entire device issuing packets.

No. 4,796,412, the rights of which are assigned to the applicant of the present invention, relates to a packaging method that uses a packet chain with a cassette attached to a tape. The packet chain for supplying packaging bags to the bag loading device is an overlapping bag, transported by a pair of parallel conveyor belts that are wound on cassette reels. The loading of the packet chain in the drive device of the periodic circular packet feeding is simply to install the cartridge in the desired position; while the bobbins are engaged in parallel drive grippers; and after this operation, the drive motor drives the grippers by means of a differential mechanism, due to which the circular feed of the packages is carried out and the tapes are wound. After the packet chain is completely used up, the cartridge can be removed and replaced with a new cartridge, where the tapes with overlapping packets will be outside the cartridge.

Although loading and unloading the cartridge in this case is easier and more convenient than with the reels according to GB 2064477, the drive unit is still complicated and the cartridge is quite expensive.

Document PCT / EP03 / 10754, filed by the applicant of this application, relates to a device for receiving a sequence of overlapped packets attached to a tape and to a method for loading a sequence of packets onto a bag loading device. The device according to document PCT / EP03 / 10754 has two reels for winding the conveyor belt, located coaxially with each other, and a differential mechanism mounted between the said reels, said differential mechanism being able to, in operation, detach it from the shaft of the bag loading device; however, two conveyor belts can be wound on said bobbins with the same tension. Each bobbin has a recess in the surface facing the other bobbin, and a differential mechanism is installed in said recesses.

Based on the device according to PCT / EP03 / 10754, this invention provides an improved device that is capable of winding ribbons of greater length. In fact, the packages are packaged in a box or the like, and it is desirable that the box holds more bags. As the number of bags increases, the length of the wound tapes increases. An increase in the number of packets before replacing a cartridge is an advantageous feature since it reduces the number of stops, resulting in increased productivity.

The tape, usually used for lapped packages attached to the tape, is made of polypropylene (esters or the like can also be used) and its width is 6.0 mm, its thickness is 0.1 mm. One side of the tape is coated with adhesive to stick the bags. A tape of about 50 meters in length is currently used and this length corresponds to 1,500 bags.

The bobbin used according to PCT / EP03 / 10754 is made of plastic and has a cylindrical core, a first set of spokes extending outward at the first end of the cylindrical core and a second set of spokes extending outward at the opposite end of the core. The free ends of the first and second spokes are connected to the respective outer rings. That is, the first and second knitting needles form a track on which adhesive tape is wound. Or a flat disk-shaped surface can replace many spokes. The bobbin is made of two parts, snapped onto each other. The winding track is slightly wider than the tape.

According to the present invention: when the first length of the adhesive tape is wound on a bobbin, the turns of the tape are superimposed on each other correctly and essentially evenly, since the adhesive tape is wound with tension and each turn exerts radial pressure on the turns underneath. With a longer winding length of the tape, the intermediate and outer turns exert a high radial pressure on the inner turns, and the radial pressure constantly increases with increasing number of turns. Due to the high radial pressure, the coils move in the axial direction and hit the lateral surface (essentially defined by the spokes) of the winding track. In this case, the shape of the turns of the tape becomes sloppy and unstable. This leads to deformation of the bobbin and, possibly, to its malfunctioning.

In view of this, only a significantly reduced tape length corresponding to a significantly reduced number of bags can be wound in order to eliminate the risk of jamming or breakage of the spool.

According to the applicant of the present invention, the problem of axial displacement of the tape during its winding is due to several factors, including the narrowness of the tape, which is the reason, for example, the stability of the Euler beam, and including the presence of fluid between each of the turns of the tape. Each tape has a side coated with a liquid adhesive, which creates a significantly reduced adhesive force. As a result of this, axial movements of the tape occur during its winding.

A possible solution to this problem could be to provide a stiffer and harder reel, but this solution does not meet the main requirement of providing an inexpensive and lightweight reel.

The Applicant has discovered that another possible solution is to provide an elastic means on the core of the bobbin to relieve the radial pressure acting on the first wound turns of the tape when the pressure has reached an excessive value. Thus, the first wound turns of tape are subjected to reduced or substantially zero radial pressure.

Thus, according to its first aspect, the present invention provides a reel for winding an adhesive transport tape for a chain of packaging attached to the tape located overlapping packages in the device for receiving located overlapping packaging bags; wherein the bobbin has a core, and the surface of the core and walls form a winding track on which the turns of the tape are wound; moreover, the surface of the core has an elastic means for relieving radial pressure acting on the first coiled tape.

According to a first embodiment of the present invention, the resilient means comprises at least one resilient protruding tenon.

A plurality of spaced-apart elastic protruding spikes are preferably formed on the surface of the core.

In one embodiment, the spikes are substantially tangent to the surface of the core.

According to another embodiment, the spikes are inclined at an acute angle with respect to the tangent surface of the core.

According to one embodiment, the thickness of the spikes decreases toward its free end.

The spikes are preferably molded to or are part of the core surface.

The bobbin is preferably at least partially made of plastic or the like.

If the spikes are molded to the surface of the core, then the surface of the core preferably has corresponding cavities at the base of each spike.

The spikes are at least partially made of metal or the like.

According to a second embodiment, said resilient means has a continuous coating of resilient material.

The resilient material mentioned is suitably rubber or foam. Said resilient material is preferably foam — either with open cells or with closed cells.

Said bobbin preferably consists of two separate parts, snapping onto each other, forming an assembled bobbin.

Each wall of the bobbin preferably has two or more spokes extending radially outward from the core, with the free ends of the spokes connected by an outer ring.

According to a second aspect of the present invention, there is provided a spool assembly for winding at least two adhesive transport tapes in the form of a packaging chain attached to a tape of overlapped bags in a device for receiving a sequence of overlapped packaging bags; however, this node has at least two of these bobbins.

In a preferred embodiment, the assembly also comprises a differential mechanism mounted between at least two reels, said differential mechanism being capable of, in operation, detachably connecting it to the shaft of the bag loading device, as a result of which two conveyor belts can be wound on said reels with the same by pulling.

Each said bobbin expediently has a recess in the surface facing another bobbin; and a differential mechanism is installed in said recess.

Each reel from among the at least two reels is preferably formed integrally with a bevel gear coaxial with the reel.

The differential mechanism preferably has a core and at least one satellite gear attached to said core and engaged with each bevel gear.

The core of the differential mechanism expediently has a mating hole for mating with the shaft of the packet loading device.

According to one embodiment of the present invention, the assembly is housed in a housing, thereby providing a cassette or the like.

According to a third aspect of the present invention, there is provided an apparatus for receiving a sequence of overlapping packaging bags transported on at least two conveyor belts; said device comprising: at least two reels for winding the conveyor belt, which are mounted coaxially with each other; wherein a differential mechanism is installed between said bobbins and is configured to, in operation, be detachably connected to the shaft of the bag loading device, as a result of which two conveyor belts can be wound onto said bobbins with the same tension; the bobbins being the bobbins mentioned above.

The present invention is set forth in the foregoing description, which is provided by way of example only and not limitation; with reference to the accompanying drawings, in which:

Figure 1a is a perspective view of a packet sequence; the reel assembly is loaded onto the packet loading device;

Fig. 1b is a perspective view of a packet sequence; the cassette is loaded onto the packet loading device;

FIG. 2 is an exploded perspective view of an apparatus for receiving a sequence of overlapped packaging bags according to the present invention; FIG.

Figure 3 - spatial separation of the parts of the reel assembly in the housing according to the implementation of the present invention;

Figure 4 is a horizontal projection of the bobbin of the first half according to the present invention;

Figure 5 is a cross section along line 4-4 indicated in the drawing of Figure 4;

6 is a horizontal projection of the reel of the second half, mating with the reel of the first half, shown in the drawing of Figure 4;

Fig.7 is a cross section along the line 6-6 indicated in the drawing of Fig.6;

Fig. 8 is a cross-sectional view of a reel assembly according to the present invention;

Fig.9 is a partial view of the bobbin of the first half shown in the drawing of Fig.4, under low pressure;

Figure 10 is a partial view similar to the view of Figure 9, under higher pressure;

11 is an enlarged view similar to the view shown in the drawing of Fig.9.

Figa schematically shows the application of the present invention on a packet loading machine 100. The packet sequence 50 includes a plurality of packaging bags 51a, 51b, 51c overlapping on two parallel conveying belts 52a, 52b (usually separated by a distance of about S of the width of the bag). The bags 51a, 51b, 51c are attached to the tapes 52a, 52b by an adhesive. The end of the tapes 52a, 52b is connected to the reels of the reel assembly 10. The reel assembly 10 is manually loaded, without tools, onto the shaft 112 of the bag loading device 100, as a result of which the assembly, in operation, has a detachable connection to the shaft. A knot can be formed by snapping it with a wing nut, a central collar, etc. You can use any method of attachment manually, without the help of tools, and therefore it does not take a lot of time or a lot of skill to complete it. The shaft 112 rotates from the electric motor 110. The shaft 112 engages with the reel assembly 10 and drives the assembly structure to receive the tapes 52a, 52b. Upon receipt of the tapes 52a, 52b, the sequence of packets 51a, 52b, 51c approaches the packet loading machine 100. Upon receipt of the tapes, packets 51a, 51b, 51c, one after the other, can be removed from the tapes 52a, 52b and filled.

When the bags 51a, 51b, 51c move towards the bag loading device 100, it is necessary to ensure the same tension of the two tapes 52a, 52b so that the bag openings, usually facing the direction of advancement, are constantly in the same orientation with respect to the bag loading device 100 (usually parallel to the packet loading device) so that packages can be removed from tapes automatically. According to the present invention, this is done with the reel assembly 10, which ensures that the tapes 52a, 52b are equally tensioned as they move towards the bag loading device around the rollers or the fixed pins 54a, 54b. This is ensured by the internal structure of the assembly 10 shown in the drawing of FIGS. 2 and 3.

The method according to which the reel unit 10 receives the conveyor belts 52a, 52b with the same tension is further explained with reference to the drawings of Figures 2 or 3. The reel unit 10 comprises two reels 12a, 12b of winding conveyor belt around which the belts 52a, 52b are wound 50 packets. 1b and 2: the reels 12a, 12b are located in a housing providing a cassette 140 comprising first and second components 14a, 14b, which, for example, snap together. The slot 15 in the first housing component 14a creates an entrance for the tapes 52a, 52b into the housing and therefore to the reel 12a for one tape 52a and to the reel 12b for another tape 52b. Two slots can be provided: one for the entry of each tape 52a, 52b. If these slots are located at the same distance that separates the tapes attached to the bags, then no rollers or pins 54a, 54b are required. The tapes 52a, 52b are attached to the bobbins 12a, 12b in any suitable manner, for example through a hole in the outer protrusion of the bobbin, and are held in place by a pin inserted into the hole from the outside. Tapes 52a, 52b are wound around bobbins 12a, 12b in the same direction.

The bobbins 12a, 12b are aligned with each other. Each bobbin 12a, 12b has a central cutout 13, which is optional. In fact, only one of the reels 12a, 12b will require a central cutout 13 so that the shaft 112 of the bag loading device has access to the differential mechanism 20 mounted between and coaxially with the reels 12a, 12b. The shaft 112 extends in the cutout 16 through the central cutout 13 of the bobbin 12b and engages with the mating hole 22 in the core 21 of the differential mechanism 20. Thus, the bobbins 12a, 12b and the core 21 of the differential mechanism are aligned with the shaft 112 of the bag loading device when the bobbin assembly is loaded to the packet download device.

At least one bevel gear 24 is mounted on the core 21. In a preferred embodiment, four bevel gears 24 are mounted symmetrically on the outside of the core 21. The bevel gears 24 are mounted on the core for free rotation about an axis perpendicular to the longitudinal axis of the mating hole 22.

The differential mechanism 20 is mounted substantially coaxially with said reels 12a, 12b in recesses on the surfaces of the reels facing each other, and therefore the reels can be located close to each other, possibly even touching each other. The engagement of the bobbin assembly by the shaft 112 may serve to axially align the bobbins 12a, 12b and the core 21 of the differential mechanism and to hold them together. Either the bobbins and the differential mechanism can be snapped onto each other (or otherwise fastened together) without the help of the shaft 112, as a result of which the shaft 112 only engages with the differential mechanism 20.

Each bobbin 12a, 12b has a molded bevel gear 26 (in a recess) which, when the bobbin assembly 10 is assembled, faces another bobbin 12a, 12b and engages with bevel gears 24. Thus, if the belts 52a, 52b have the same tension and the shaft 112 of the bag loading device rotates the core 21, then the two reels 12a, 12b will rotate at the same speed as the bevel gears 24 will not rotate around its axis of rotation, but the entire core and bobbin assembly will rotate at the same speed around the longitudinal axis shaft 112. If the tension of one of the tapes 52a, 52b decreases, then the bobbin 12a, 12b on which the tape is wound will rotate faster than the other bobbin. This is because the bevel gears 24 will rotate until the tension of the tapes 52a, 52b wound around their respective reels 12a, 12b is balanced. Due to this, it is possible to maintain a sequence of 50 packets in a given orientation so that each subsequent lapped packet 51a, 51b, 51c will enter the packet loading device in a completely correct orientation for removal from tapes 52a, 52b as the tapes 52a, 52b will be wound on reels 12a, 12b of assembly 10.

According to a preferred embodiment of the present invention, the spool assembly 10 is located in the cassette 140 (see FIGS. 1b and 2). 1b shows a door for protecting the cartridge 140, but in practice this may not be necessary.

Components 14a 14b, reels 12a, 12b of the cassette body and components of the differential mechanism can be made of plastic molded under pressure. They are inexpensive and, therefore, components having this design can have a longevity based on the calculation of the entire sequence of packets, which may consist of several hundred packets.

It is assumed that the reel assembly or cassette will be stored, for example, during shipment so that the front of each tape will be connected to the corresponding reel, and therefore the entire sequence of 50 packages can be easily loaded onto the loading device without the need for pre-connecting the tapes 51a, 52b with reels 12a, 12b.

The reel assembly 10 or cassette 140 can be reused. In operation, the machine operator attaches the following sequence of packets to the reels of the spare cartridge, while the machine is still working with yet another sequence of packets. After another sequence of packets is completed, the operator will be able to replace the old cartridge (or reel assembly) with a spare one and restart the machine. The used tape is then removed from the first cartridge, which can then be reused.

Referring to Figs. 4-8, a conveyor belt winding reel 12 (12a or 12b) according to the present invention has a cylindrical core 121 with a cylindrical surface 122. From the edges of the core surface 122, spokes 123 protrude outwardly radially outwardly connected by an outer ring 123 '. Obviously, the spokes can be replaced with a solid surface to obtain a solid wall 123 '. The walls and the core surface in turn form a winding track 125 on which the coils of the adhesive transport tape 52 are wound. The bobbin 12 preferably consists of two separate parts 127, 128 that snap onto each other and form the bobbin assembly. The first part 127 may be, for example, a protruding core 121 having an opening with a wall 123 '(possibly made of spokes 123 and a connecting ring 124); wherein the second part 128 (FIGS. 6 and 7) can be substantially flat, also with spokes 123 and with a connecting ring 124. In the embodiment of FIGS. 6 and 7, several hooks 130 protrude from the second part 128 of the spool. When the bobbin is assembled by connecting the first and second parts 127, 128, the hooks 130 enter the corresponding holes 130 'of the first part 127.

According to the invention, the core surface 122 has an elastic means 126 for relieving the radial pressure acting on the first wound turns of the tape. According to a first embodiment of the invention, the elastic means 126 is made in the form of at least one elastic protruding spike 126. Preferably, as in FIG.

According to one implementation of the present invention, the spikes 126 are essentially tangent to the surface of the bobbin. Or the spikes are inclined at an acute angle to the tangent surface of the bobbin. The angle at which the spikes are inclined with respect to the tangent direction can be up to 30 °, preferably from 5 to 30 °, more preferably from 10 to 20 °, and even more preferably about 15 °; angles of 5, 10, 14, 15, and 20 ° are considered to be appropriate for the present invention.

According to one implementation of the present invention, the thickness of the spike decreases in the direction of its free end. This feature is intended to reduce the stiffness of the spikes, which, under the action of pressure, are adjacent to the cylindrical surface of the core and, accordingly, reduce their length.

The spikes are preferably molded with core surface 122 or part thereof. In particular, if the bobbin is at least partially made of plastic.

If the spikes are molded with the core surface 122, then the core surface 122 preferably has corresponding cavities 129 at the base of each spike 126 (see FIG. 11). This facilitates the formation of spikes along with the core.

According to the present invention, the spikes 126 can also be made of metal or the like.

Despite the fact that a plurality of spikes 126 arranged at the same interval give good results, good performance can also be obtained by providing a continuous coating of elastic material around the core surface. The coating may be made of rubber or, preferably, of foam material, i.e. compressible material. The foamed material may be “open cell” or “closed cell” material. It is advisable to use any type of expandable polymer material that creates a compressible foam, for example polyethylene, polyurethane, esters, etc.

Turning to FIGS. 9-10, the action of the spikes 126 is described below. Since the tape is wound with tension, each turn of the tape creates pressure in the radial direction. When a relatively small number of turns of the tape 52 are wound around the core 121, the spikes 126 are subjected to relatively small pressure and will essentially not bend. As the number of turns increases, the radial pressure acting on the spikes 126 will increase accordingly and the spikes 126 will bend. Thus, the tension and, consequently, the radial pressure on the turns of the previous winding will be removed and the tape will not move to the walls 123 'of the winding track. Due to this, the number of turns on the bobbin can be significantly increased in comparison with the known bobbins, and thus the objective of the present invention will be achieved.

11 is similar to FIG. 10, but the cavities 129 are shown at the base of the spikes 126. These cavities are useful for providing spikes made integral with the core by injection molding.

The invention is set forth above by way of example only, and variations are possible in its implementation. In particular, as mentioned above, the cartridge 140 is not required for the operation of the invention according to FIGS. 1a and 2. The design of the cartridge case may vary.

Claims (23)

1. A bobbin (12, 12a, 12b) for winding an adhesive transport tape (52, 52a, 52b) of a chain of packaging bags attached to the tape in a device for receiving a sequence of packaging bags; moreover, the bobbin (12, 12a, 12b) contains a core (121), while the surface (122) and the walls (123 ') of the core form a track (125), on which the turns of the tape (52, 52a, 52b) are wound; characterized in that the surface (122) of the core contains elastic means (126) for relieving the radial pressure acting on the first wound turns of the tape (52, 52a, 52b). 2. The bobbin according to claim 1, characterized in that the elastic means (126) has at least one elastic protruding spike (126). 3. The bobbin according to claim 2, characterized in that on the surface (122) of the core there are provided a plurality of elastic protruding spikes arranged over an equal interval (126). 4. The bobbin according to claim 2 or 3, characterized in that at least one spike (126) essentially extends tangentially to the surface (122) of the core. 5. Reel according to claim 2 or 3, characterized in that at least one spike (126) is inclined at an acute angle to a tangent to the surface of the reel. 6. The bobbin according to claim 2 or 3, characterized in that at least one spike (126) is formed with the surface of the core or with a part thereof. 7. The bobbin according to claim 2 or 3, characterized in that the surface of the core has cavities (129) at the base of the at least one spike. 8. The bobbin according to claim 1, characterized in that the elastic means (126) has a continuous coating of elastic material. 9. The bobbin of claim 8, characterized in that the elastic material is a material selected from the group consisting of rubber and foamed plastic material. 10. Node (10) of a bobbin for winding at least two adhesive transport tapes (52, 52a, 52b) of a chain of packaging bags attached to a tape in a device for receiving a sequence of packaging bags; moreover, the bobbin assembly contains at least two bobbins (12, 12a, 12b) according to any one of claims 1 to 9. 11. The node of claim 10, characterized in that it also restrains the differential mechanism mounted between the at least two reels, and the said differential mechanism is configured to, in operation, its detachable connection with the shaft of the loading device, resulting in two transporting tapes can be wound on said reels with the same tension. 12. The node according to claim 11, characterized in that each reel has a recess in the surface facing another reel; and the fact that the differential mechanism is installed in said recess. 13. The node according to claim 11, characterized in that each of the number of the said at least two reels is formed integrally with a bevel gear, coaxial with said reel. 14. The node according to item 13, wherein the differential mechanism has a core and at least one satellite gear attached to said core and installed with the possibility of engagement of each bevel gear. 15. The node according to 14, characterized in that the core of the differential mechanism has a mating hole for interfacing with the shaft of the packet loading device. 16. The node according to claim 10, characterized in that it is located in the housing, thereby providing a cartridge (140). 17. A chain of packaging bags attached to a tape, the chain comprising a number of bags and at least two adhesive conveyor belts having corresponding free ends; moreover, the free ends of the tape mesh with the reels of the reel assembly according to any one of claims 10-16. 18. A device for receiving a sequence of overlapping packaging bags transported by at least two conveyor belts (52, 52a, 52b), comprising at least two reels (12, 12a, 12b) of winding conveyor belt located coaxially with each other, and a differential a mechanism mounted between said bobbins, the differential mechanism being configured to, in operation, detachably connect it to the shaft of the bag loading device, as a result of which two conveyor belts can atyvatsya on said spools with equal tension; moreover, the bobbins correspond to any one of claims 1 to 9. 19. The device according to p, in which each of the bobbins (12, 12a, 12b) has a recess on the surface that faces the other bobbin, and in which the said differential mechanism is installed in the said recesses. 20. The device according to p, in which each of the bobbins (12, 12a, 12b) is formed integrally with a bevel gear, coaxial with the bobbin. 21. The device according to claim 20, in which the differential mechanism comprises a core and at least one satellite gear attached to the core and engaged with each bevel gear. 22. The device according to item 21, in which the core of the differential mechanism contains a mating hole for interfacing with the shaft of the packet loading device. 23. The device according to any one of paragraphs.18-22, in which the bobbins and differential mechanism are installed in the cassette.

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