Embossed unit

Abstract

An embossing unit includes a fixed structure (1) and a movable structure (2) configured to move to or away from the fixed structure (1), a first embossing assembly (LA), a second embossing assembly (UA), and a bonding assembly (GA). The first embossing assembly (LA) includes a first steel engraving roller (3) and corresponding rubber rollers (4). The second embossing assembly (UA) includes a second steel engraving roller (5) and corresponding rubber rollers (6). The bonding assembly (GA) is mounted on the movable structure (2). The engraving rollers (5) of the first embossing assembly (LA) and the second embossing assembly (UA) are mounted on the fixed structure (1), while the rubber rollers (6) of the second embossing assembly (UA) are mounted on the movable structure above the bonding assembly (GA).

Description

Technical Field

[0001] This invention relates to an embossing unit.

[0002] More specifically, the present invention relates to a type of unit commonly referred to as an embossing-gluing unit, wherein each of the two components comprises a steel engraving roller and a rubber pair of rollers for embossing two paper layers, and an adhesive is dispensed between the two paper layers by means of a suitable gluing unit incorporated into the embossing unit. This type of unit is commonly used in so-called paper product processing plants, where articles such as toilet paper rolls, kitchen paper rolls, and more generally products derived from paper deformation are produced. Background Technology

[0003] A typical drawback of known types of embossing-gluing units is that when the engraving roller must be replaced, the continuity of the paper layer must be interrupted and the paper path belt must be broken. Summary of the Invention

[0004] The main objective of this invention is to simplify the replacement operation of the engraving roller in the embossing unit, which uses an adhesive unit to connect the embossed layers with adhesive.

[0005] According to the present invention, this result is achieved by employing the concept of producing an embossed unit having the features pointed out in this application. Other features of the invention are the subject of this application.

[0006] This invention simplifies the replacement of engraving rollers, particularly the upper engraving roller, without interrupting the continuity of the paper layers or disconnecting the corresponding paper path. Furthermore, this invention can be implemented without introducing structural, mechanical, or functional complexity. Attached Figure Description

[0007] These and other advantages and features of the invention will be better understood by each person skilled in the art from the following description and accompanying drawings, which are provided by way of example but are not to be considered limiting, in which: Figure 1 A schematic side view of the embossing unit according to the invention in operation is shown; Figure 2 It shows Figure 1 The embossing unit is configured before the engraving roller of the second embossing component is pulled out; Figure 3 It shows Figure 1 and Figure 2 The unit is configured to allow the engraving roller of the second upper embossing assembly to be pulled out; Figure 4 A schematic side view of an embossing unit according to another embodiment of the present invention in operation is shown; Figure 5 It shows Figure 4 The embossing unit is configured before the engraving roller of the second embossing component is pulled out; Figure 6 It shows Figure 4 and Figure 5 The unit is configured to allow the engraving roller of the second upper embossing assembly to be pulled out; Figure 7 A schematic side view of an embossing unit according to another embodiment of the present invention is shown. Detailed Implementation

[0008] Simplified to its essential structure and referring to the accompanying drawings, the embossing unit (EA) according to the present invention comprises: - A fixed structure (1) on which the engraving rollers of the first embossing assembly (LA) and the second embossing assembly (UA) are arranged; -Active structure (2), on which the rubber rollers of the second embossing assembly (UA) and the bonding assembly (GA) are arranged; - An actuation device for moving the movable structure (2) to the fixed structure (1) and removing the movable structure (2) from the fixed structure (1).

[0009] Reference Figure 1-3 In the example shown, the first embossing assembly is the lower embossing assembly, and the second embossing assembly is the upper embossing assembly. The lower embossing assembly (LA) includes a lower steel engraving roller (3) and corresponding lower rubber rollers (4), which are arranged horizontally between two opposing walls of the fixed structure (1). The steel engraving roller (5) of the upper embossing unit (UA) is positioned above the lower engraving roller (3) and is also horizontally oriented between two opposing walls of the fixed structure (1). The rollers (3, 4, 5) are movably mounted on the fixed structure (1) by means of movable connecting members known per se. For example, the rollers (3, 4, 5) can be connected to the fixed structure (1) by means of movable end clamps acting on the ends of the rollers. The rubber rollers (6) of the upper embossing unit (UA) are mounted between two opposing walls of the movable structure (2) and are horizontally oriented like the other rollers (3, 4, 5). The figure also shows the front of the engraving roller (5) of the upper embossing unit (UA) constrained to the mating roller (M) of the fixed structure (1), i.e., located on the opposite side relative to the gluing unit (GA). For example, the lower part of the movable structure (2) is mounted on a linear guide formed on the appendage (10) of the fixed structure (1) and is controlled by an electric motor (21), allowing it to move to and away from the fixed structure (1). Arrow "F2" indicates the translation of the movable structure (2).

[0010] The gluing assembly (GA) includes a trough (7) for receiving adhesive and a first horizontal roller (8) that removes adhesive from the trough (7) and contacts a second horizontal roller (9) to transfer the adhesive, which in turn dispenses the adhesive onto a paper layer (V2), as further described below. The rollers (8, 9), controlled per se by corresponding electric motors (not visible in the figure), rotate at predetermined speeds about their respective axes to remove adhesive from the trough (7) and dispense it onto the layer (V2).

[0011] In the operational state, the active structure (2) is as follows: Figure 1 As shown, the upper and lower embossing components and their respective rollers (3, 4, 5, 6) are arranged together in the layer (V1, V2) embossing configuration. In this configuration, the paper layer (V1) passes between the rollers (3, 4) of the lower embossing unit (LA), while another layer (V2) passes between the rollers (5, 6) of the upper embossing unit (UA). Furthermore, the layer (V2) comes into contact with the distribution roller (9) of the gluing component (GA), and the layers (V1) and (V2) pass between the engraving rollers (4, 5). In this way, an operational configuration is achieved in which the layers (V1, V2) are embossed and glued together to generate a paper web (W) formed by the embossed and glued layers (V1, V2). The paper web (W) emerges from the nip formed by the engraving roller (5) and the mating web (M).

[0012] When the activity structure (2) is as follows Figure 3 When the rubber roller (6) of the upper embossing unit is moved away from the fixed structure (1) as shown schematically, it is also moved away from the movable structure (2) due to the constraint.

[0013] Therefore, as Figure 3 As schematically shown, a space (S) is formed through which the engraving roller (5) of the upper embossing unit can be pulled out for replacement, as indicated by arrow "R5". Since the rubber roller (6) of the upper embossing unit moves with the movable structure (2), in this configuration, the layer (V2) rests on the rubber roller (6) of the upper embossing unit and the engraving roller (4) of the lower embossing assembly, freeing up the space above the engraving roller of the upper embossing assembly. Therefore, replacing the engraving roller (5) of the upper embossing unit does not require cutting the layer (V2), preserving its continuity. Furthermore, it is not necessary to remove the upper paper channel (not visible in the figure), which typically follows the same path as the layer.

[0014] In practice, the rubber roller (6) of the upper embossing assembly (UA) is mounted on a movable support consisting of the support structure (2) of the bonding assembly (GA).

[0015] In the example above, when the movable structure (2) moves away from the fixed structure (1), the movable structure (2) translates as indicated by arrow (F2). Preferably, as shown... Figure 2 As shown, before the movable structure (2) is removed from the fixed structure (1), the mating spool (M) and the gluing unit (GA) are separated from the engraving roller (5) of the upper embossing assembly in a manner known per se. In this respect, it should be noted that the mating spool (M) is mounted on the support via the movable arm (B), and for simplicity, only... Figure 1 The diagram schematically illustrates that the movable arm (B) constrains the mating spool (M) to the side of the fixed structure (1), allowing it to move to or away from the engraving roller (5). Similarly, the adhesive assembly (GA) is mounted on the corresponding support via a slider (S), and for simplicity, only... Figure 1 As schematically shown, the slider (S) allows the adhesive assembly (GA) to move to and from the engraving roller (5).

[0016] According to another embodiment of the invention, the movable structure (2) is hinged to the lower part of the fixed structure (1) along the horizontal axis (A2). The rotation (R2) of the movable structure (2) about the axis (A2) is controlled by a corresponding actuator (22). Also in this case, the movable structure (2) is configured to be close to... Figure 4 The ground-fixed structure (1) is shown schematically, or as shown below. Figure 6 The movable structure (2) is schematically removed from the fixed structure (1). In this case, the rubber roller (6) is mounted on the movable structure (2) above the bonding assembly, producing the advantages described in the previous example. Furthermore, in this case, it is preferable that the mating drum (M) and bonding unit (GA) are, as shown in the previous example, before the movable structure (2) is removed from the fixed structure (1). Figure 5 The engraving roller (5) of the ground embossing assembly is schematically shown to be separated from the ground embossing assembly.

[0017] Figure 1-6 The embossing unit shown is configured to perform nested embossing.

[0018] Figure 7 The embossing unit schematically shown is configured to perform end-to-end embossing. In this case, the engraving roller of the first embossing assembly is positioned in the position of the mating roll mentioned in the previous example. Also in this example, the embossing unit (EA) according to the invention includes: a fixed structure (1) on which the engraving rollers of the first embossing assembly (LA) and the second embossing assembly (UA) are arranged; a movable structure (2) on which the rubber rollers and the bonding assembly (GA) of the second embossing assembly (UA) are arranged; and an actuation device for moving the movable structure (2) to the fixed structure (1) and removing it from the fixed structure (2).

[0019] In practice, the details of implementation may vary in any case with respect to the various elements described and shown in an equivalent manner without departing from the concept of the solution adopted, and thus remain within the scope of protection granted by this patent in accordance with the appended claims.

Claims

1. An embossing unit, comprising a stationary structure (1) and a movable structure (2) configured to be moved to or away from the stationary structure (1), a first embossing assembly (LA), a second embossing assembly (UA) and a gluing assembly (GA), wherein, The first embossing assembly (LA) includes a first steel engraving roller (3) and a corresponding first rubber roller pair (4), wherein the second embossing assembly (UA) includes a second steel engraving roller (5) and a corresponding second rubber roller pair (6), and wherein the bonding assembly (GA) is mounted on the movable structure (2), characterized in that the engraving roller (5) of the second embossing assembly (UA) and the first embossing assembly (LA) are mounted on the fixed structure (1), while the second rubber roller pair (6) of the second embossing assembly (UA) is mounted on the movable structure above the bonding assembly (GA).

2. The embossing unit according to claim 1, characterized in that The movable structure (2) is mounted on the linear guide (20) and connected to the first actuator (21), which controls the translation of the movable structure (2) from the fixed structure (1) and towards the fixed structure (1).

3. The embossing unit according to claim 1, characterized in that The movable structure (2) is hinged to the lower part of the fixed structure (1) along the horizontal axis (A2) and connected to a corresponding second actuator (22), which controls the rotation of the movable structure (2) from the fixed structure (1) and toward the fixed structure (1).

4. The embossing unit according to claim 1, characterized in that The adhesive assembly (GA) includes a trough (7) for receiving adhesive, a first horizontal roller (8) and a second horizontal roller (9), the first horizontal roller (8) removing the adhesive from the trough (7) and the second horizontal roller (9) receiving the adhesive from the first horizontal roller (8) and operating as an adhesive dispenser.

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