Device for covering a cartridge

Abstract

The invention relates to a device for covering a box by adhesive bonding to a flexible cover, comprising a bonding station, a rubbing station for rubbing the cover to the bottom of the box, and further processing stations, the rubbing station having a stationary tool pair, and a transport system, the tool pair consists of a driven pressing device with a variable movement curve and a counter-holder, the counter-holder and the contact surface of the respective cartridge to be treated being moved synchronously in the transport direction thereof.

Description

Technical Field

[0001] The invention relates to a device for covering boxes according to the preamble of claim 1 . Background Art

[0002] US2009 / 0156380A1 shows a facility for producing boxes with a device for covering raw boxes. Here, raw boxes and covering materials with adhesive are transported to a joining mechanism by a device located upstream. The joining mechanism places the raw box with its bottom on the glued side of the covering. In the subsequent device, the covering is rolled on all four box walls. The existing excess part of the material blank is folded inwards. For this purpose, each wall is equipped with a covering mechanism.

[0003] In order to remove the undesired air inclusions between the cover and the box bottom, WO2011 / 015988A1 proposes a device for rubbing the bottom surface. The device is composed of a large number of rollers that are continuously circulated in the form of a chain. The rollers are moved along under the box bottom in such a way that the freely rotatable rollers roll on the box bottom and thus the trapped air is smoothed away in one direction. Here, the box is pressed against the rollers by means of plates that act on all its walls.

[0004] During such a friction press, due to the rigidity of the wall, the forces acting on the edge of the base are greater than the forces acting on the flexible base. This particularly presses the edge against the cover. Entrained air cannot escape easily in the case of an airtight cover material. In addition, the friction press box often moves unintentionally. Rigid rollers can also cause undesirable marks. Summary of the invention

[0005] The object of the present invention is therefore to create a device for covering boxes of this type which is able to process a wide variety of boxes and covering materials while producing a high product quality.

[0006] The object of the invention is achieved by a device having the features of claim 1. Advantageous variants of the invention are provided by the features described in the dependent claims.

[0007] For this purpose, a device for covering a box is provided, wherein the box is constructed as a dimensionally stable box and the covering is formed by a flexible, curved material. The box can be formed in a simple manner by a rectangular base surface as a bottom and side walls connected to each side of the base surface and arranged orthogonally to the base surface. Here, the invention is not limited to the box shape. In particular, the bottom can be formed by any polygon or also have a curved profile. Likewise, the wall does not necessarily have to be oriented orthogonally to the bottom.

[0008] The device has a preparation position and a joining position. In the preparation position, the boxes are individually prepared for further processing. In the joining position, the first connection of the cover and the box is carried out. A positioning device is provided for this. The positioning device accommodates the individual boxes in the preparation position. The positioning device transfers the box into the joining position. Subsequently, the positioning device releases the box in the joining position.

[0009] In order to remove possible air inclusions between the box and the cover and to bring about sufficient joining force, a rubbing device is provided. The rubbing device has a rubbing press pointing toward the joining surface of the box-covering assembly. In order to be able to apply rubbing force, a matching retainer is provided. During rubbing, the box-covering assembly is clamped between the rubbing press on one side and the matching retainer on the other side. The rubbing press and the matching retainer form a tool pair.

[0010] The surface of the rubbing device in contact with the product has an extension transverse to the transport direction. Preferably, the contact surface extends at least over the width of the box. Therefore, the rubbing device can be designed fixedly with respect to the rubbing position and the cover can be rubbed over the entire box width.

[0011] The pairing retainer prevents the box cover aggregate from being accidentally displaced. For this purpose, the pairing retainer has a contact surface, which acts on the box cover aggregate and is arranged opposite to the friction press. In order to avoid damaging the product, the contact surface is designed to be movable in its transport direction together with the box cover aggregate. A drive unit of the pairing retainer is provided for this. The drive unit makes the contact surface of the pairing retainer move synchronously and without sliding relative to the box. In order to achieve different transport speeds and therefore also different production speeds, a controllable drive unit is provided.

[0012] The product is fed by a transport device. The transport device can include one or more transport belts and / or transport drive belts. The conveying surface of the belt and / or drive belt then determines the transport plane. The direction of movement of the one or more conveying return sections determines the transport direction.

[0013] The transport device can be divided into at least two transport sections. In the two transport sections, the first transport section is arranged upstream of the friction press and the second transport section is arranged downstream of the friction press. The positioning device for placing the box on the cover is arranged in the area of ​​the transport section, which is arranged upstream of the friction press.

[0014] Preferably, the rubber is formed by a brush. The flexibility of the bristles allows the cover to be rubbed carefully onto the box and to brush away undesirable air inclusions. Alternatively, the brush may have one or more substantially planar sheets instead of bristles.

[0015] The rigidity of the box is not constant over its width. The box is very hard on all its edges, while the box is relatively soft in the middle of its face. To compensate for this, the brush has a curved contact area transversely to the transport direction in an advantageous design. Alternatively, instead of a curved geometry, a brush can be used whose flexibility or hardness changes accordingly transversely to the transport direction.

[0016] Advantageously, a round brush is used as a friction press, which has an axis of rotation oriented transversely to the transport direction. In particular, in connection with a controllable drive of the round brush, the relative speed between the box-covering assembly and the bristles or lamellae can be varied at a constant transport speed. In this way, products of different material combinations consisting of box, covering and adhesive can be processed without loss of quality.

[0017] The tangential speed of the round brush in the contact area supports the covering onto the brush, which tangential speed points in the direction of the transport speed and is greater than the transport speed at least at the time when the leading edge of the leading excess part of the covering enters, thereby preventing the excess part from sinking below the transport plane.

[0018] Particularly advantageous are spherical round brushes with a contact surface that is curved transversely to the transport direction. Its tangential speed is highest in the center and decreases toward the outside. This allows entrained air to be wiped away transversely from the center to the outside. In addition, the curvature of the box bottom is compensated or even over-deflected.

[0019] Preference is given to a direction of rotation in which the tangential speed of the friction press in its contact region with the covering is oriented in the same direction as the transport speed.

[0020] A supercritical speed of the friction press is particularly advantageous, wherein the tangential speed of the friction press is greater than the transport speed. This ensures that the leading excess of the covering is driven into the transport plane by the friction press. This prevents the excess, which may be provided with adhesive material, from accidentally entering.

[0021] Particularly advantageous is a rotational speed profile of the round brush which has a speed which changes when processing individual products. A controllable drive is provided for this purpose. The above-mentioned supercritical speed when the covering enters can be reduced during the actual friction of the box passing the round brush. The friction between the brush and the covering is thus reduced to the required minimum. When the rear excess of the covering passes the round brush, a tangential speed which is less than the transport speed or a reverse direction of rotation keeps the excess stretched and prevents undesired damage to the covering.

[0022] Advantageously, the rubbing press is equipped with a feed mechanism which determines the position of the rubbing press relative to the transport plane. In particular in the case of an elastic rubbing press (e.g. a brush), the rubbing force on the material combination of the product can thus be adjusted. When idling, the rubbing press passes through the transport plane, so that the box cover assembly passes through the rubbing station particularly smoothly, in particular without projections perpendicular to the transport plane.

[0023] The contact surface of the matching holder that moves with the box cover aggregate continuously circulates in a simple design. The preferably controllable drive of the matching holder makes the speed of the contact surface during rubbing and pressing the same as the transport speed.

[0024] Particularly advantageous are mating holders with contact surfaces spaced apart transversely to the transport direction, the contact surfaces having regions spaced apart from one another. Particularly advantageous are double-track mating holders. The two contact surfaces of the mating holder each grasp an edge of the box parallel to the transport direction. In particular, the walls of the box extending transversely to the transport direction are thus not additionally loaded with force, and trapped air can simply escape counter to the transport direction.

[0025] Preferably, such a double-track pair holder is equipped with a feed mechanism that adjusts the position of the contact surface transversely to the transport direction to a range specified by the format of the box.

[0026] In a first embodiment, the pairing retainer is configured as a roller. The roller is arranged directly opposite the friction press along the transport direction. In this way, when the box enters the gap between the friction press and the pairing retainer or when the box comes out of the gap between the friction press and the pairing retainer, the undesirable movement of the box is avoided.

[0027] In an alternative embodiment, the mating holder is formed by a belt or a drive belt. It is particularly advantageous here to bridge the gap between two transport systems adjacent to the molder, which is caused by the molder. Here, the belt or the drive belt extends from an area clearly in front of the molder in the transport direction at least above the molder. The mating holder extends in a particularly suitable manner into the area in which the box is already caught by the transport system downstream of the molder. In this way, uninterrupted and non-destructive transport is possible.

[0028] Preferably, the distance between the mating holder and the friction press is adjustable. This allows boxes of different heights to be produced. If the mating holder is equipped with a feed mechanism with a controllable drive, the feed mechanism can be automated and adjusted according to product variations. For this purpose, the feed drive and, if necessary, other drives of the friction press are connected to a common machine controller via control lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The invention is explained in more detail below with the aid of the accompanying drawings, which include all details not mentioned further in the description, and with the aid of exemplary embodiments. In the drawings:

[0030] Figure 1 A schematic side view of the friction pressing device is shown;

[0031] Figure 2 A schematic view from behind of the friction pressing device is shown;

[0032] Figure 3 A perspective view showing a friction pressing device;

[0033] Figure 4 A schematic view showing a friction and pressure mechanism;

[0034] Figure 5 Two velocity curves showing the tangential velocity of the friction brush. DETAILED DESCRIPTION

[0035] exist Figure 1 The device shown in the figure for rubbing each covering material 102 onto the outer bottom surface of the box-shaped box 101 comprises a transport device 2 and a rubbing device 1. Rubbing removes the undesirable air inclusions between the box 101 and its covering 102 and is responsible for bonding the covering 102 to the box 101 over the entire surface and evenly.

[0036] The transport device 2 is formed by two conveyor belts 21, 22 arranged successively in the transport direction 1000. The first conveyor belt 21 and the second conveyor belt 22 are spaced apart from each other. A rubbing device 1 is arranged in the gap. The first conveyor belt 21 is located upstream of the rubbing device 1 and forms a first transport section 201. In the first transport section 201, the box 101 with the cover 102 already attached to its bottom surface is transported to the rubbing device 1. In the second transport section 202, the box 101 with the fixedly rubbed cover 102 is moved away from the rubbing device 1 and provided to a downstream device (not shown) for further processing.

[0037] The two conveyor belts 21, 22 are configured as suction belts to prevent the box 101 with the attached cover 102 from being accidentally moved. The working return sections 211 of the two conveyor belts 21, 22 that have a conveying effect determine the transport plane 1100. The transport direction 1000 extends in the longitudinal direction of the conveyor belts 21, 22 parallel to the transport plane 1100.

[0038] A rubbing device 1 is arranged in the gap between the first conveyor belt 21 and the second conveyor belt 22. The rubbing device 1 is mainly composed of a rubbing machine and a matching holder, which together form a tool pair 10. The rubbing machine is formed by a roller-shaped round brush 11. The rubbing machine is basically arranged below the conveying plane 1100 and is oriented transversely to the conveying direction 1000. The round brush 11 extends at least over the width of the box 101 to be processed.

[0039] The round brush 11 is provided with Figure 3 The controllable drive 15 adapts the rotational speed or tangential speed 1121 of the brush 11 to the transport speed 1000 or also to the product properties of the box 101 with its cover 102 .

[0040] like Figure 1 As shown in the figure, the bristles 112 of the round brush 11 pass through the transport plane 1100 in the area of ​​the upper apex of the brush 11. In order to be able to adjust the force applied during rubbing, the round brush 11 is accommodated in a frame (not shown) by a feed mechanism 16. Its feed direction 1601 extends perpendicularly to the transport plane 1100.

[0041] Pairing holder in Figure 1 In the embodiment shown in FIG. 1 , the round brush 11 is configured as a roller 12. The rotation axis 111 of the round brush and the rotation axis of the counter roller 12 jointly define a crown plane 1101. The crown plane 1101 extends perpendicularly to the transport plane 1100 and transversely to the transport direction 1000. The feed direction 1601 of the round brush 11 extends parallel to the crown plane 1101.

[0042] The distance between the counter roller 12 and the transport plane 1100 or the round brush 11 corresponds to the height of the box 101 to be processed. In order to process boxes of different heights, the counter roller 12 and the round brush 11 have a feeding mechanism not shown in the figure.

[0043] Like the round brush 11, the counter holder also has a controllable drive 14. Figure 1 The directions of rotation of the round brush 11 and the counter roller 12 shown in each case support the transport action of the transport device 2. The same direction of rotation of the brush 11 supports the front excess part 1021 of the cover 102 onto the round brush 11. This prevents the front excess part 1021 from accidentally sinking into the gap between the round brush 11 and the preceding conveyor belt 21.

[0044] exist Figure 4The spherical round brush 11 with its drive 15 is shown in the figure. Here, the radius 115 of the bristle body 112 changes along its axis of rotation 111. The radius 115 in the outer area is smaller than the radius in the middle section of the round brush 11. Therefore, the bristle ends 113 protrude from the transport plane 1100 with different widths corresponding to the corresponding radius 115. Therefore, the displacement of the bottom area in the middle of the box 101 is compensated during rubbing. In addition, the rubbing pressure and the tangential speed 1121 of the bristle ends 113 are therefore maximum in the middle of the box and slightly decrease towards the side edges. This makes it possible to wipe away unwanted air inclusions from the middle to the outside and also to cause safe and reliable rubbing in the case of large box formats or flexible box bottoms.

[0045] The advantage is that Figure 2 1 and 2. The design of the pairing holders 12, 13 shown in FIG. is interrupted along their rotation axis. Here, the contact surface 131 of the pairing holders 12, 13 is limited to two tracks. Each of the tracks grips the side wall of the box 101 respectively. The largest part of the two end walls is not loaded with force by the pairing holders during the entire friction process. In this way, in particular, the force on the middle area of ​​the front edge or the rear edge of the box 101 is not additionally increased, and possible air inclusions can be more easily wiped off parallel to the transport direction 1000.

[0046] In an alternative embodiment, the counter holder is not designed as a roller 12, but as in Figure 3 The design shown in FIG. 1 is a drive belt 13. The length of the working return section here bridges the gap between the two conveyor belts 21, 22. The box 101 is placed on the round brush 11 or the box 101 leaves the round brush 11 in this way, which is smoother and more stable.

[0047] exist Figure 3 1 and 2. The diagram also schematically shows that the box 101 is placed on the cover 102 for bonding. For this purpose, the boxes 101 are prepared in the preparation position 3001. The clamp, which can be constructed as a suction device 30 as shown in the figure, lifts the box 101 in the preparation position 3001 and transfers the box to the bonding position 3002. In the bonding position 3002, the cover 102 is already waiting, and the clamp places the box 101 on the cover 102 so that the cover 102 adheres to the bottom of the box 101. The bonding position 3002 is located on the first belt 21, which transports the box 101 with the attached material 102 to the friction pressing device 1.

[0048] The conveying elements 11, 12, 13, 21, 22, 30 each have at least one controllable drive 14, 15. They are controllably connected to a central control unit (not shown) just like the feed drives of the friction press and the mating holder. By means of the control unit, the drive unit 15, in particular the round brush 11 as a friction press, is loaded with a speed profile which results in Figure 5 The speed curves 1121, 1121' of the bristle end 113 are shown in FIG.

[0049] The speed curve is repeated in each machine cycle, at least in each rubbing process. In this case, the standard curve mainly has a constant speed, which has a subordinate tangential speed 1121 of the bristle end 113. In this case, the tangential speed 1121 is in the same direction as the transport speed 1101 of the box 101 and is greater in value. In this case, a relative movement of the bristles 112 relative to the cover 102 or the box 101 occurs, which is lightly wiped.

[0050] The front excess part 1021 of the cover 102 is ensured to reach the round brush 11 and should be prevented from undesirably entering the gap between the preceding conveyor belt 21 and the round brush 11. For this purpose, the speed curve 1121 shown is proposed to increase the supercritical speed of the round brush 11 when the round brush grabs the front excess part.

[0051] In order to tension the rear excess 1022 of the cover 102, the speed curve 1121 shown provides for a reduction in the tangential speed when the round brush 11 grabs the rear excess 1022. In particular, it is provided that the tangential speed 1121 is kept lower than the transport speed in this section.

[0052] The optional speed curve 1121″ shown is distinguished from the standard curve 1121 by a tangential speed that is identical to the transport speed in the constant section. The optional speed curve 1121′ is therefore primarily suitable for sensitive materials or surfaces. The changed phase of the second section of the speed change relative to the standard curve 1121 corresponds to the changed box length.

[0053] Reference numerals list

[0054] 1 friction device 3 positioning device

[0055] 2 transport device 10 pairs

[0056] 11 round brush 202 second transport section

[0057] 12 paired rollers 211 working return section

[0058] 13 paired transmission belt 212 unloaded return segment

[0059] 14 The first driving part 1000 of the pair holder transports the direction

[0060] 15 The second driving unit 1001 of the round brush transport speed

[0061] 16 Feed mechanism 1002 placement movement

[0062] 21 The first conveyor belt 1011 is located in front of the wall

[0063] 22 The second conveyor belt 1012 is on the rear wall

[0064] 30 The protruding part of the material in front of the clamp 1021

[0065] The protruding part of the material at the back of 101 box 1022

[0066] 102 Materials

[0067] 103 longitudinal edge 1100 transport plane

[0068] 111 rotation axis 1101 coronal plane

[0069] 112 brush body 1121 tangential speed

[0070] 113 bristle end 1601 feeding direction

[0071] 115 Radius 3001 Ready Position

[0072] 131 sub-surface 3002 joint position

[0073] 201First transport section.

Claims

1. A device for covering a box, wherein a substantially flexible covering (102) is bonded to at least one outer surface of the box (101) by gluing, and wherein at least a positioning device (3), which has at least one preparation position (3001) in which a single box (101) is prepared at a time, and which also has at least one engagement position (3002) on each cover (102), and a movable clamp (30) such that the clamp (30) lifts the box (101) in the preparation position (3001) and transfers it to the cover (102) in the engagement position (3002) and releases it there, A rubbing device (1) located downstream of the positioning device (3) in the product flow, comprising at least one tool pair (10) for rubbing the region of the cover (102) connected to the box (101) onto the box (101), wherein: The tools (11, 12, 13) forming the tool pair (10) are arranged on both sides of the transport plane (1100), A transport device (2) having at least one continuously circulating transport belt (21, 22), wherein the return section (211) of the transport belt (21, 22) having a conveying effect determines the transport plane (1100), the transport device also having a transport direction (1000) for the boxes (101) respectively placed on the cover (102), the transport direction being substantially linear and parallel to the transport plane (1100), the transport device also having at least one friction device in the transport direction (1000) The invention further comprises a first transport section (201) upstream of the tool pair (10) of the device (1), in which the boxes (101) respectively connected to the covers (102) are transported to the rubbing device (1) in the transport direction (1000), and a second transport section (202) downstream of the rubbing device (1) in the transport direction (1000), in which the boxes (101) having the covers (102) rubbed on the outer surface are further transported by the rubbing device (1), It is characterized in that the at least one tool pair (10) has at least one friction press (11) fixed with respect to the friction press position and a pairing holder (12, 13), the pairing holder having at least one sub-surface as a contact surface (131) movable in the transport direction (1000), wherein the at least one friction press (11) extends substantially transversely to the transport direction (1000) and the at least one pairing holder (12, 13) has a first drive unit (14), so that at least the contact surface (131) of the pairing holder (12, 13) acting on the box (101) moves at least sometimes substantially synchronously with the transported box (101).

2. The device according to claim 1, characterized in that At least one transverse axis (111), wherein the at least one friction press is formed by a round brush (11) rotatably supported around the transverse axis (111), and the round brush (11) is drivingly connected to a second drive part (15) of the friction press device (1).

3. The device according to claim 2, characterized in that The brush body (112) of the at least one round brush (11) has different radii (115) along the at least one transverse axis (111).

4. The device according to claim 2 or 3, characterized in that A tangential speed (1121) of the outer bristle ends (113) of at least one driven round brush (11), wherein the tangential speed of at least each bristle end (113) is at least sometimes greater than a transport speed (1001) of a box (101) placed on the corresponding cover (102).

5. The device according to any one of claims 2 to 4, characterized in that The controllable drive unit (15) of the round brush (11) has a changeable speed curve (1121, 1121') of the round brush, wherein the rotation speed of the round brush (11) changes in a specified manner from the time point when the preceding box enters the friction pressing device (1) until one of the boxes following the preceding box enters.

6. A device according to any one of the preceding claims, characterised in that The feed mechanism (16) of the at least one friction press (11) has a feed direction (1601) oriented substantially orthogonally to the transport plane (1100), wherein the friction press (11) at least sometimes passes through the transport plane (1100).

7. A device according to any one of the preceding claims, characterised in that The at least one counter holder has a continuously circulating transport element (12, 13) which is driven by at least one drive (14) of the counter holder.

8. A device according to any one of the preceding claims, characterised in that The contact surface (131) of the at least one pairing retainer acting on the box is interrupted transversely to the transport direction (1000) so that the contact surface has at least two areas spaced apart from each other, wherein the spacing between the at least two areas is variable, and the feed mechanism is allocated to at least one of the at least two areas so that the spacing between the at least two areas is controllably variable with respect to each other.

9. The device according to claim 7 or 8, characterized in that At least one continuously circulating transport element (12, 13) of the pairing holder is formed by a rotatable roller (12), wherein the rotatable roller (12) is drivingly connected to at least one drive unit (14) of the pairing holder, the rotation axis of the roller (12) being oriented substantially transversely to the transport direction (1000) and unfolding a coronal plane (1101) with the rotation axis (111) of the round brush (11), the coronal plane being oriented substantially orthogonal to the transport direction (1000).

10. The device according to claim 7 or 8, characterized in that At least one continuously circulating transport element (12, 13) of the counterholder is formed by at least one belt or at least one drive belt (13).

11. The device according to claim 10, characterized in that At least one belt forming the at least one mating retainer or at least one drive belt (13) forming the at least one mating retainer extends in the transport direction (1000) at least above at least one friction press (11) and at least above a region of at least one transport section (201, 202) arranged adjacent to the at least one friction press (11).

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