EP3556667A1 - Strapping device - Google Patents

Abstract

The present invention is a strapping device with at least one drive motor (4), further comprising at least one drive roller (5) for a from a strip supply (2) supplied strapping (1) and at least one tension roller (6) for clamping the order to strapping material strapped around strapping (1) is equipped. In addition, a closure unit (3) for connecting the band ends of the guided around the Good strapping band (1) is realized. According to the invention, a pivotable link (10) is provided, which applies at least one counter-roller (5a, 6a) to the drive roller (5) for belt drive or to the tension roller (6) for belt tensioning.

Description

The invention relates to a strapping device, with at least one drive motor, further comprising at least one drive roller for a supplied from a tape supply strapping, and at least one tensioning roller for tensioning the umreifende around the material to be strapped strapping, and with a closure unit for connecting the band ends of order the goods are guided around the strapping band.

By means of strapping devices, general goods to be strapped, such as newspaper stacks, paper rolls, packages, etc., are summarized. For this purpose, the strapping is first led around the relevant and to be strapped Good. This is done using the drive roller. Then the strapping band is tensioned using the tensioning roller. In this tensioned state, a band loop of the strapping band is separated from the band supply. In addition, the two band ends of the strapping are pressed against each other and connected together in the locking unit. If the strapping band is, for example, made of plastic, the band ends are joined by welding, for example by friction welding.

As a rule, the drive roller and the tension roller are each equipped with a counter-roller, so there are a pair of cooperating drive rollers as well as a pair of interacting tension rollers realized between each clamp the strapping. In this way, the strapping band is transported by means of the drive roller and the counter roller. The tensioning roller, in conjunction with the associated counter-roller, ensures the tensioning of the strapping band after it has been guided around the material to be strapped. That will be in the detail in the generic state of the art according to the DE 10 2008 004 118 B4 described.

The well-known doctrine of the DE 10 2008 004 118 B4 Taken together only a single drive motor, on the motor shaft one of the drive rollers is arranged, that is, the drive roller itself or interacting with the drive roller counter-roller or the so-called drive counter-roller. In addition, a motion transmission means is provided, which transmits the movement of the motor shaft of the drive motor to a reduction gear. The reduction gear drives at least one of the tension rollers, that is, the tension roller or the associated counter-roller or clamping counter-roller. This has proven itself in principle, because only a single drive motor for the drive and the clamping ensures, whereas in the realized in practice prior art is often worked with two drive motors. However, the invention expressly does not exclude, for example, two drive motors in this context. For example, a drive motor for driving the tensioning roller or the tensioning rollers and a further drive motor for driving the drive roller or the drive rollers provide.

In the prior art according to the WO 2015/117255 A1 a strapping device is described which serves with a drive for driving a tape feed device, a belt retracting device and finally a tensioning device. In this way, the strapping head of the strapping device should be made particularly compact.

The state of the art after the GB 2 041 869 A deals with a strapping device, in which the interaction of two drive rollers is described. One of the drive rollers can be started and removed using a lifting arrangement.

The invention is based on the technical problem of further developing such a strapping device such that, taking into account a compact design, it is possible to switch quickly and reliably between a drive of the strapping band and a tensioning operation.

To solve this technical problem, a generic strapping device in the invention is characterized in that a pivotable gate is provided, which applies at least one counter-roller to the drive roller for belt drive or to the tensioning roller for belt tensioning.

The least one counter-roll thus cooperates with the drive roller for belt drive. Alternatively, the opposing role in question but also in conjunction with the tensioner for a band tensioning provide. In this case, the procedure is usually that either the tape drive or the band tensioning is made. In principle, however, the tape drive and the belt tensioning can overlap in time, at least partially. Mostly, however, initially the tape drive. Only when the tape drive is completed, the band spans as it were switched.

In the context of the invention, therefore, initially used on a pivoting gate. The pivoting link is usually rotatably mounted on or on a front side of a flange. In contrast, there is at the back of the flange, the at least one drive motor. In principle, two drive motors can be realized at this point, namely a drive motor for the drive roller and a further drive motor for the tension roller. As a rule, however, here with a worked single drive motor, which drives both the drive roller and the tension roller respectively.

In order to be able to differentiate easily and reliably between a tape drive and the tape spans, the scenery ensures that the counter-roller is applied on the one hand to the drive roller for tape drive or on the other hand to the tensioning roller for tape clamping. It can be worked in principle with a (single) counter role.

As a rule, however, at least two counter-rollers are provided, which are supported by the scenery. For this purpose, the respective counter-rollers are each rotatably connected to the backdrop. That is, the scenery carries the at least two counter-roles, which is a drive counter-roll and a counter-tensioning roller.

The drive counter-roller, when it contacts the drive roller, ensures that the strapping belt clamped between the drive roller and the drive counter-roller is transported. In contrast, the counter-tensioning roller in conjunction with the tensioning roller ensures that the strapping band clamped therebetween is tensioned or can be tensioned. Both counter-rollers, that is to say the drive counter-roller and the counter-counter-rotating roller are each driven unrestrained and only rotatably mounted on the link. Consequently, either the drive roller or the tension roller alone provides for the associated drive.

The change between the tape drive and the band tensioning takes place casually in that either the drive counter-roller is applied to the drive roller or, alternatively, the tension counter-roller to the tension roller. Since when changing from tape drive to tape clamping the respectively no longer required counter-roll is lifted, both the drive roller and the idler pulley continue to be operated advantageously by means of a drive motor and set in rotation. That is, in the tape drive, the strapping tape is clamped and transported between the drive roller and the counter drive roller. In this case, since the tension counter-roller is lifted from the tension pulley and spaced, the belt can smoothly slide over the still rotating tension pulley in this case.

Conversely, the strap clamping corresponds to the fact that the counter-tensioning roller is applied to the tensioning roller with the aid of the slide and the strap can be clamped and tensioned. In this case, since the drive counter-roller is lifted from the drive roller and removed, the drive roller can continue to rotate unchanged and the strapping be performed more or less resistance over the drive roller.

The change from tape drive to tape and back succeeds particularly simple and reliable, because this only a slight pivoting movement of the backdrop is required. In fact, the backdrop is generally L-shaped. In addition, the backdrop usually has at the end of their long L-leg on a rotatable mounting, which is mostly observed over the previously mentioned flange. For the change from tape drive to tape tensioning and back are generally pivotal movements of the L-shaped link sufficient, which correspond to a pivot angle below 20 degrees and preferably even 10 degrees and less. Such swivel angle can be implemented quickly and mechanically simple.

In fact, the interpretation in detail is such that the scenery is rotatably mounted not only end of their long L-leg, but also one of the two counter-rollers is mounted on the long L-leg, while the other counter-roller is mounted on the short L-leg , It has an arrangement of such a form proved to be particularly favorable, in which the drive counter-roller is connected approximately centrally to the long L-leg of the L-shaped backdrop. In contrast, the tension counter-roller is usually the end of the short leg L.

The scenery is generally moved against the force of at least one spring. The spring ensures that the link in its neutral position, for example, occupies a position in which both counter-rollers are on the one hand spaced from the drive roller and on the other hand from the tension roller. In order to move now the backdrop against the force of at least one error and to make the counter-roll to the associated driven roller, an eccentric is provided for pivoting the gate in general. The eccentric is advantageously designed as a cam or has such. For example, the cam can work on a cam follower lever via a cam follower. The cam roller lever in turn ensures that the L-shaped link is pivoted against the force of its associated spring.

As already explained, it is advantageous to work with a "single" drive motor, which ensures both the drive of the drive roller and the tension roller. For this purpose, the drive motor generally acts on the tensioning roller via a gear. In the transmission, it is advantageous to a reduction gear, because for tightening the strapping after his passing around the material to be strapped usually high torques are required and the drive motor is generally designed as a fast-running electric motor.

In contrast, for the application of the drive roller generally no translation of the drive motor is required. In this case, the drive motor acts on the interposition of a shaft bearing sleeve Drive roller. The coupling of the drive motor with on the one hand the gearbox and on the other hand the shaft bearing sleeve is generally carried out via a motion transmission means. The motion transmission means may be a belt and in particular a timing belt. In this case, pulleys or toothed belt pulleys on the output shaft of the drive motor and on the input shaft of the transmission as well as an input shaft of the shaft bearing sleeve provide for the corresponding transmission.

In this way, the shaft bearing sleeve, the gearbox and the drive motor in a predominantly coincident alignment can be mounted practically parallel to each other on the back of the flange. As a result, a particularly compact design is provided and can optimize the weight distribution relative to the flange.

As a result, a strapping device is provided which is compact in construction and functionally reliable. This is especially true in the case that existing plastic strapping should be processed. Of course, the strapping device described can also be used in connection with, for example, steel straps. In principle, of course, also conceivable strapping, which are neither made of steel nor made of plastic or exist, for example, those based on natural raw materials such as natural polymers. Likewise can be used as Umreifungsbandmaterial on mixed forms. Due to the compact and compact design, the strapping device described can basically be used both for so-called handsets and for stationary strapping machines. Here are the main benefits.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment;

Fig. 1

die erfindungsgemäße Umreifungsvorrichtung schematisch in einer Frontansicht und

Fig. 2

einen Schnitt durch den Gegenstand nach der Fig. 1 schematisch entlang einer Linie A-A.

Show it:

Fig. 1

the strapping device according to the invention schematically in a front view and

Fig. 2

a section through the object after the Fig. 1 schematically along a line AA.

In the figures, a strapping device is shown. With the aid of the strapping device, strapping band 1 can be guided around objects to be strapped or goods to be strapped, as is generally known and explained in detail in the prior art already referred to in the introduction. The strapping 1 is for this purpose by a merely in the Fig. 1 supplied to recognizing tape supply 2. To the in the Fig. 1 merely partially shown strapping device still belongs here a merely indicated closure unit 3, which is formed in the embodiment and not restrictive as Reibschweißeinheit. The closure unit 3 ensures that band ends of the strapping band 1 to be joined together after being clamped are coupled around the material to be strapped, in this case by friction welding. Of course, the closure unit 3 can also provide the desired connection of the band ends of the strapping band 1 in other ways.

Decisive for the present invention are now in the Fig. 2 to be recognized drive motor 4, with the help of which in the embodiment and not limiting both a drive roller 5 and a tension roller. 6 are driven. Evidently the Fig. 2 it is in the drive motor 4 to a (single) electric motor, which as well as there to be recognized reduction or reduction gear 7 and a shaft bearing sleeve 8 are mounted on the rear side of a flange 9 total. On the flange 9 is still mounted on its front beyond a gate 10, which will be considered in more detail below.

Based on the sectional view in the Fig. 2 it can be seen that the drive motor 4, the gear 7 and the shaft bearing sleeve 8 are each connected in parallel to each other and predominantly perpendicular to the flange 9. This allows an optimal weight distribution. In addition, the attachment of the drive motor 4 "next to" the gear 7 as well as the shaft bearing sleeve 8 ensures that the aforementioned elements 4, 7, 8 perpendicularly away from the flange 9 require relatively little space. The engine 4 is equipped with a pulley 11 on its output shaft. A similar pulley 12 can be found on an input shaft of the transmission 7. Also recognizes another pulley 13, which is arranged on the input side on a shaft 14 which is mounted within the shaft bearing sleeve 8 and carries the drive roller 5 at the other end. The gear 7 is additionally equipped with an integrated brake 15, which, however, is only an option and ensures or can ensure that after completion of a tensioning operation of the strapping 1, the gear 7 and with it the attached on its output shaft tensioner 6 is stopped.

The individual pulleys 11, 12, 13 are driven by the drive motor 4 in the exemplary embodiment via a common motion transmission means 16. The motion transmission means 16 is a flexible motion transmission means 16, in the present case a toothed belt. Accordingly, the individual pulleys 11, 12, 13 in Embodiment and not restrictive designed as a toothed belt pulleys. Overall, the drive motor 4 ensures that the transmission 7 continuously sets the tensioning roller 6 in rotation as well as the drive roller 5 via the interposed shaft bearing sleeve 8.

In order to be able to differentiate between a previously described belt drive of the strapping 1 and a band tensioning, according to the invention, the previously mentioned pivotal gate 10 is provided. The gate 10 is pivotally connected to the front side of the flange 9. For this purpose, the gate 10 carries at least two counter-rollers 5a, 6a. The counter-roller 6a belongs to the tension roller 6 and is consequently designed as a tension counter-roller 6a. In the other counter-roller 5a is in contrast to a drive counter-roller 5a, which belongs to the drive roller 5, as will be explained in more detail below.

On the basis of in the Fig. 1 shown front view can be seen that the backdrop 10 is formed overall L-shaped. In fact, a long L-leg 10a and a short L-leg 10b are realized. The drive counter-roller 5a is rotatably connected according to the embodiment of the long L-leg 10a, is located approximately in the center of the question in question long L-leg 10a. In contrast, the counter-tension roller 6a is rotatably connected to the short L-leg 10b. In fact, the counter-tensioning roller 6a is located at the end of the short L-leg 10b in question.

The gate 10 can be pivoted slightly back and forth about its pivot point or at this point formed on the front side of the flange 9 pivot bearing 17, as a double arrow in the Fig. 1 suggests. For this purpose correspond pivoting angle of the L-shaped link 10, which are usually located below 20 degrees, usually even only 10 degrees and less. The backdrop 10 is doing against the force of a total Spring 18, 19 moves. In fact, within the scope of the exemplary embodiment, a spring 18 belonging to the band tensioning device and a further spring 19 are realized, which primarily has an effect on the drive of the strapping band 1.

For pivoting the L-shaped link 10 a total of an eccentric 20, 21, 22 is provided. The eccentric 20, 21, 22 is composed in detail of a cam 20 and a cam roller 21, which in turn is rotatably mounted on a cam roller lever 22. The cam roller lever 22 has an axis of rotation 23, by means of which it is rotatably mounted relative to the flange 9.

Rotational movements of the cam 20 to one in the Fig. 1 indicated and in the plane or parallel thereto extending axis now lead to that on the cam roller 21 of the cam roller lever 22 in comparison to its pivot bearing 23 in the Fig. 1 also indicated pivoting movement performs. As a result, the L-shaped link 10 is pivoted because the cam roller lever 22 is connected to the opposite end of the tension counter-roller 6a of the short L-leg 10b of the L-shaped link 10 and in this way the gate 10 in its pivoting movement "entraining".

For example, if a tape drive of the strap 1 is required, this corresponds to the fact that the L-shaped link 10 is pivoted about its pivot bearing 17 in a clockwise direction. As a result, the drive counter-roller 5a comes to rest against the drive roller 5 and the strap 1 is clamped between the two rollers 5, 5a. As a result, the strapping 1 is unwound from the supply of tape 2 and can be guided around the material to be strapped, for example, by means of a belt guide channel. Once the strapping 1 has been led around the estate, the strapping 1 with respect to the tape supply 2 or Band loop separated by means of a separation unit, not shown. The two ends of the strapping 1 are held. Now the strapping 1 is stretched.

For this purpose, the strapping 1 is clamped between the tension roller 6 and the tension counter-roller 6a. To achieve this, the link 10 is acted upon in the opposite direction by means of the eccentric 20, 21, 22, namely performs a counterclockwise movement with respect to its pivot bearing 17. As a result, the drive counter-roller 5a moves away from the drive roller 5, rather comes Clamping counter-roller 6a for engagement with the tensioning roller 6. The strapping belt 1 clamped between the two rollers 6, 6a can subsequently be tensioned. In addition, the strained ends of the strapping 1 can be connected by means of the closure unit 3, as has already been described in the introduction.

Claims (15)

A strapping device, comprising at least one drive motor (4), further comprising at least one drive roller (5) for a strapping band (1) fed from a band supply (2), and at least one tension roller (6) for strapping the strapping band ( 1), and with a closure unit (3) for connecting the band ends of the guided around the good strapping band (1), characterized in that a pivotable link (10) is provided, which at least one counter-roller (5a, 6a) to the drive roller ( 5) to the belt drive or to the tension roller (6) applies for strap clamping. Apparatus according to claim 1, characterized in that the drive motor (4) provides both for driving the drive roller (5) and the tension roller (6). Apparatus according to claim 1 or 2, characterized in that the drive motor (4) via a gear (7) acts on the tension roller (6). Device according to one of claims 1 to 3, characterized in that the drive motor (4) with the interposition of a shaft bearing sleeve (8) acts on the drive roller (5). Device according to one of claims 1 to 4, characterized in that the link (10) carries at least two counter-rollers (5a, 6a), namely a driving counter-roller (5a) and a counter-tensioning roller (6a). Device according to one of claims 1 to 5, characterized in that the link (10) is rotatably mounted on a flange (9). Apparatus according to claim 6, characterized in that the flange (9) on its front side the link (10) and on its rear side receives the drive motor (4) and optionally the gear (7) and the shaft bearing sleeve (8). Device according to one of claims 1 to 7, characterized in that the link (10) is L-shaped. Apparatus according to claim 8, characterized in that the link (10) is rotatably mounted end of its long L-leg (10a). Apparatus according to claim 8 or 9, characterized in that the one counter-roller (5a) is mounted on the long L-leg (10a) and the other counter-roller (6a) on the short L-leg (10b), Apparatus according to claim 10, characterized in that the drive counter-roller (5a) is connected approximately centrally to the long L-leg (10a). Device according to one of claims 9 to 11, characterized in that the clamping counter-roller (6a) is connected to the short L-leg (10b). Device according to one of claims 1 to 12, characterized in that the link (10) against the force of at least one spring (18, 19) is moved. Device according to one of claims 1 to 13, characterized in that for pivoting the link (10) an eccentric (20, 21, 22) is provided. Apparatus according to claim 14, characterized in that the eccentric (20, 21, 22) has a cam (20), which operates, for example via a cam roller (21) and a cam roller lever (22) on the link (10).

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