Method for producing pack of interfolded sheets and interfolding machine
By using a side-arrangement and W-shaped staggered folding method and equipment, the low productivity and unevenness of staggered folded sheet packages in the existing technology have been solved. This has enabled uniform distribution and easy removal of sheets during high-speed production, thereby improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2026-05-19
AI Technical Summary
Existing technologies suffer from low productivity, uneven product distribution, and difficulty in easy removal of materials in packages of staggered folded sheets, especially during high-speed production processes, where the sheet distribution is uneven and removal is difficult.
An interlaced folding machine and method are employed, in which two continuous sheets are arranged sideways and folded in a W-shape to ensure that each sheet has the same or approximately the same length between its first and second ends, forming two creases and a center crease, with all center creases on the same side. Clamping members and suction devices are used to ensure precise positioning and uniform distribution of the sheets.
It enables uniform staggered folding and easy removal of sheets during high-speed production, improving productivity and ensuring uniform distribution and stability of sheets within the package, thus simplifying the production process.
Smart Images
Figure CN122070253A_ABST
Abstract
Description
Invention Field
[0001] This invention relates to the technical field of producing bags from interlaced folded sheets, i.e., sheets or sheet articles folded in a zigzag pattern relative to each other; typically, the sheets are made of paper materials, and the bags can be, for example, bags of paper handkerchiefs, napkins, or paper towels. More specifically, this invention relates to sheets having multiple folds, also known as… Multiple folds Sheet material. Background Technology
[0002] In this technical field, sheets to be folded in an interlaced manner to form a stack of sheets (packages) are typically supplied in the form of continuous strips or continuous rolls, usually from an unfolding member that begins with a paper roll, which passes through a cutting member defining the sheet article, and then reaches a folding member configured and pre-set to fold the sheet article in an interlaced manner once or multiple times. The stack of sheets being formed is typically supported by a support member, and once the required number of interlaced sheets is reached, the stack of sheets is separated by a separating member.
[0003] Cutting components can be achieved by means of net cutting (also known as...) Neat cut Separating sheets from one another, or creating pre-perforated lines or dots between sheet articles (also known as...) splice connection (TB) is used to limit sheet products.
[0004] When sheets are folded one after another into a zigzag shape using folding components, portions separated from each other by corresponding creases are formed on each sheet: each of these portions is generally called a sheet width. Therefore, it is possible to create packages of sheets with staggered folds of 2, 3, 4, etc. A 4-sheet sheet with widths of equal or approximately equal length is also called a W-fold sheet. Experts in the field will understand that the lengths of the widths may not match precisely, as even slight variations in the positioning of components in a staggered folding machine can lead to dimensional variations. This can be further explained by the fact that the machines typically operate at high speeds, and the sheets are usually made of paper, or in any case, of materials with similar properties; paper materials are subjected to varying degrees of tension, which in turn determines dimensional variations.
[0005] Figure 1 This reflects the international patent application WO2023100048A1 Figure 1 C. Figure 1 The diagram illustrates the schematic sequence of sheets in a package of staggered folded sheets, which are folded in a W-shape, i.e. have 4 sides. Figure 1 The example has folded sheets, i.e., two sides of a sheet on one line face two sides of a sheet on another line, and includes the use of one line. splice connection(TB) and use on another line Neat cut .
[0006] Figure 2 This illustrates a schematic sequence of a package of staggered folded sheets in a W-shape, performed according to the method described in WO2010031529A1: superimposed by the speed difference between consecutive sheets in the same continuous sheet, as in WO2010031529A1. Figure 9 As shown in the example. In package WO2010031529A1, there are no two-line sheets, but continuous sheets will always be on the left, as shown. Figure 2 As shown in the example, it will always be on the right side of a previously folded sheet.
[0007] Figure 3 It shows the version according to EP2379435A1 Figure 11 The method shown illustrates the schematic sheet sequence of a W-shaped folded package of sheets in an asymmetrical manner: the three sides of the first sheet on one line face the three sides of the second sheet on another line, and the sides of the first sheet face the sides of another sheet on the other line.
[0008] The solution in WO2023100048A1 does not allow for continuous sheets that are separated from each other on two lines, and the package lacks uniformity and balance because there is [something] on one side. splice connection (TB) connecting materials, while on the other side there is Neat cut cut The gap left. (Refer to...) Figure 1 There is a high risk during use, as even pulling out a single sheet from the dispenser can cause [damage / loss]. splice connection (TB) The continuous sheet is pulled out, and usually the sheet is pulled out from another line that is folded in an alternating manner with the two sheets.
[0009] The solution in WO2010031529A1 has significant limitations in terms of productivity because stacking by the speed difference between sheets can only achieve a slower staggered folding speed compared to the stacking speed achievable by stacking two different consecutive sheets, as is the case in WO2023100048A1. The packages obtained in WO2010031529A1, especially during the process of adding sheets into the package, tend to sag to one side, making package management more difficult in the continuous steps of production and use.
[0010] The solution in EP2379435A1 enables a product with variable behavior because, as sheets are withdrawn from the dispenser, continuous sheets can be secured to a package with three or only one web. A particularly critical case is when the sheet is secured by only one web; these webs are more prone to contamination as they leave the dispenser. Furthermore, the orientation of one or more sheets leaving the dispenser varies. For these reasons, Figure 3 The type of package with staggered folded sheets illustrated in the diagram is not widely in demand in the market.
[0011] Therefore, there has long been a need for a package of sheets or sheet products in which the sheets are folded in an alternating manner and evenly distributed within the volume occupied, while ensuring easy removal.
[0012] These properties are achieved in a package of staggered folded sheets comprising staggered folded sheets, wherein each sheet has the same or approximately the same length between its first and second ends. Each sheet is W-shaped, i.e., has two creases between the first and second ends and a central crease between the two creases, each of the two creases and the central crease dividing a section of the sheet (i.e., a portion of the sheet) of equal length, which is either one-quarter of the same length or approximately the same length.
[0013] The first and second ends of each sheet are separate from the first and second ends of the other sheets.
[0014] These sheets are oriented in the same way, that is, all their center creases are on the same side relative to the two corresponding creases.
[0015] Apart from the end sheet of the package, each sheet is advantageously folded in an alternating manner with two sheets that are on the same side relative to that sheet, and each of the two sheets is folded in an alternating manner with the sheet through two widths.
[0016] exist Figure 4 and Figure 5 A similar staggered folding design can be seen in [the image], and in patent application publication number US 2011 / 0129633A1. Figure 12 and Figure 13 The package is clearly illustrated in the image. According to the aforementioned patent application, the package can be obtained using a length-folding conversion line. Summary of the Invention
[0017] The present invention aims to eliminate one or more drawbacks of existing technical solutions. One object of the present invention is to ensure higher productivity relative to existing solutions, while achieving the same performance in the final product, namely, in the production of packages of staggered folded sheets with multiple creases, particularly packages of sheets or sheet articles, the sheets or sheet articles being staggered and evenly distributed within their occupied volume, and ensuring easy removal from the package.
[0018] Some embodiments are intended to simplify the implementation process and / or ensure the quality of the product obtained, especially with the increase in the speed of mutual folding.
[0019] According to the claims, the method for packaging a sheet of interlaced folding and the interlacing folding machine for packaging a sheet of interlaced folding, these and other objectives will be apparent to those skilled in the art.
[0020] According to the teachings of this document, the method includes the following steps: - Provide a first continuous sheet and a second continuous sheet; - Arrange the first and second continuous sheets sideways; - W-shaped folded sheets with staggered folded sides.
[0021] The first and second continuous sheets have the same or approximately the same length between their first and second ends, and have a central portion located exactly between the first and second ends, and two intermediate portions located exactly between the first end and the central portion and exactly between the central portion and the second end, respectively.
[0022] In the step of side-laying the sheets, the sheets are arranged sideways such that the first continuous sheet is offset from the second continuous sheet by half the same length, or approximately offset by half the same length.
[0023] In the W-shaped staggered folding step, the first continuous side panels at the first end and the second end, and the second continuous side panels at the middle portion, advantageously pull the first continuous and second continuous side panel arrangement sheets together so as to form two creases and a central crease between the two creases on each sheet.
[0024] According to the teachings of this document, the staggered folding machine includes a staggered folding unit for performing W-shaped staggered folds on the sheet, a support member for supporting the staggered folded sheet, a first sheet supply line, and a second sheet supply line.
[0025] The staggered folding unit includes: a first roller having a side surface for receiving a sheet, including a member for clamping the sheet and rotating relative to a first axis of rotation; a second roller having a corresponding side surface for receiving a sheet, including a corresponding member for clamping the sheet and rotating relative to a second axis of rotation; a first folding element; and a second folding element.
[0026] The support members are configured to support the staggered folded sheets below the first and second rollers.
[0027] The first supply line supplies the first continuous sheet on the side surface.
[0028] The second supply line supplies a second continuous sheet on the corresponding side surface.
[0029] The second axis of rotation is parallel to the first axis of rotation, and both are supported on the mating plane.
[0030] The first and second rollers rotate at the same tangential speed, but in opposite directions.
[0031] The first folding element moves the sheet from the side surface toward the support member at the first folding area.
[0032] The second folding element moves the sheet from the corresponding side surface toward the support member at the second folding area.
[0033] The first and second supply lines are advantageously configured to supply sheets of equal or substantially equal length between their first and second ends, such that the sheet of the first supply line passes through the mating plane in such a manner that it is offset by half or substantially offset by half the same length relative to the sheet of the second supply line.
[0034] Furthermore, the clamping member is configured to clamp the first end and the second end of the sheet of the first supply line and the sheet of the second supply line for the first portion between the joint plane and the first folding area, such that the first folding element alternately forms a central crease on the sheet of the first supply line or the sheet of the second supply line, located at the center between the first end and the second end of the sheet. Attached Figure Description
[0035] Specific embodiments of the invention will be described in the following parts of this specification, with reference to the claims and the accompanying drawings, wherein: Figures 1 to 3 These are schematic diagrams of continuous sheets of corresponding packages of sheets folded in the W-shaped manner according to existing technology. Figure 4 and Figure 5 These are schematic diagrams of continuous sheets, representing embodiments of a package of staggered folded sheets, which can be obtained by the method of the present invention and a staggered folding machine; Figure 6 and Figure 7 Schematic diagrams of the staggered folding machine according to the present invention are shown respectively, which respectively realize Figure 4 and Figure 5 A package of interlaced folded sheets; Figure 8 This is a schematic diagram in cross-sectional form, illustrating the suction arc in an embodiment of the staggered folding machine according to the invention, which achieves... Figure 4 Interlaced folded sheets; Figure 9 yes Figure 8 A schematic side view of the cutting roller, showing the location of the cross-section; Figure 10 The diagram is presented in cross-sectional form, illustrating the suction arc in an embodiment of the staggered folding machine according to the invention, which achieves... Figure 4 A package of interlaced folded sheets; Figure 11 yes Figure 10 A schematic side view of the cutting roller, showing the location of the cross-section, which will be explained in more detail below; Figure 12 A cross section is shown through a mid-plane perpendicular to the axis of the roller in an embodiment of the staggered folding machine according to the invention; Figure 13 yes Figure 12 A magnified view of a portion of the view; Figures 14 to 16 The following are examples of methods used: Figure 12 The intermediate embodiment produces a package of staggered folded sheets in continuous time. Figure 12 Mid-section. Detailed Implementation
[0036] Referring to the accompanying drawings, reference numeral P denotes a package (P) of staggered folded sheets (S) comprising staggered folded sheets (S) wherein the second ends of each sheet between a first end (I) and a second end (F) are identical or substantially identical.
[0037] Each sheet (S) in the bundle (P) of the staggered folded sheets (S) is W-shaped, i.e., it has two creases (Sp) and a center crease (Scentr), which is located between the two creases (Sp) between the first end (I) and the second end (F). Furthermore, each of the two creases (Sp) and the center crease (Scentr) separates a portion of the span or sheet (S) of equal extension length, which is equal to one-quarter of the same length (SI), or the extension lengths of the span or sheet are approximately the same.
[0038] In other words, taking into account the dimensional variations that may occur in a staggered folding machine as described above, the four spans are identical or substantially identical to each other. Dimensional variations may be caused by the structure or dynamic behavior of the staggered folding machine and the flexibility of the material (typically paper), which can be stretched more or less; for example, a sheet (S) can be obtained from portions of strips (N1, N2) subjected to different tensions, or different tensions may alter the position of creases (Sp, Scentr) on the sheet (S). Throughout this specification, the term "substantially" is intended to indicate dimensional variations that may occur in the field of reference (especially for the reasons described above).
[0039] The first end (I) and the second end (F) of each sheet (S) are separated from the first end (I) and the second end (F) of the other sheets (S), that is, for all sheets (S) Neat cut .
[0040] The sheets are oriented in the same way, so that all their center creases (Scentr) are on the same side relative to the two corresponding creases (Sp). For example, all creases (Scentr) are to the left of the two creases (Sp) on the same sheet, such as... Figure 4 As shown; or both are on the right side of the two creases (Sp) of the same sheet, as shown. Figure 5 As shown.
[0041] Except for the end sheet (S), each sheet (S) is folded in an alternating manner with two sheets (S) on the same side relative to the sheet (S), and each of the two sheets (S) is folded in an alternating manner with the sheet (S) by two spans.
[0042] like Figure 4 and Figure 5 As shown, for each sheet (S) of a bundle (P) of staggered folded sheets (S), the above situation occurs except for the end sheet (S), which can be staggered with a single sheet (S) by two spans.
[0043] As described above, the sheet (S) inside the bundle (P) of the staggered folded sheet (S) is staggered with the subsequent sheet (S) by two spans, and each time a sheet (S) is pulled out, the opening formed by the two spans of the end sheet (S) always faces the same direction, that is, the crease between the two spans pulled out is always on the same side.
[0044] Furthermore, the sheet (S) is evenly distributed inside the package (P) of the staggered folded sheet (S).
[0045] The present invention relates to a method for realizing a package (P) of an interlaced folded sheet (S) as described above.
[0046] One embodiment of the method includes the following steps: - Provide a first continuous (T1) sheet (S) and a second continuous (T2) sheet (S), wherein the length (SI) of the sheet (S) between the first end (I) and the second end (F) is the same or substantially the same, and has a central portion (Sc) located exactly between the first end (I) and the second end (F), and two intermediate portions (Si) located exactly between the first end (I) and the central portion (Sc) and exactly between the central portion (Sc) and the second end (F), respectively.
[0047] - The first continuous (T1) and the second continuous (T2) sheets (S) are arranged sideways, such that the first continuous (T1) sheet (S) is offset from the second continuous (T2) sheet (S) by half the same length (SI), or approximately offset by half the same length (SI). - The side-layout sheets (S) of the first continuous (T1) and the second continuous (T2) are pulled together by the side of the first continuous (T1) at the first end (I) and the second end (F) and the side of the second continuous (T2) at the middle part (Si), so that two creases (Sp) and a center crease (Scentr) between the two creases (Sp) are formed on each sheet (S).
[0048] The above method enables the creation of a package (P) of staggered folded sheets, which has the aforementioned advantages.
[0049] Despite Figures 12 to 16 In order to more clearly illustrate the working principle of the staggered folding machine (1000) according to the invention, the sheets (S) are shown to highlight the detached state between them, but normally, each continuous sheet (S) between the first continuous (T1) and the second continuous (T2) is separated from each other (using... Neat cut The method involves cutting, but the sheets are essentially in contact with each other. Therefore, it can be said that in the first continuous (T1) and the second continuous (T2), the sheets (S) overlap one after another with virtually no gaps.
[0050] Figure 6 Middle arrow and Figure 7 The middle arrow shows an example of the pulling position in the step of performing a W-shaped staggered fold on the side-arranged sheets (S). Figure 6The diagram illustrates a method of pulling a side-arranged sheet (S) from the side of a first continuous (T1), specifically, displacement of the sheet (S) of the first continuous (T1) at its first end (I), center portion (Sc), and second end (F) along the direction from a sheet (S) of the second continuous (T2) toward the side-arranged sheet (S) of the first continuous (T1). This method is equivalent to the aforementioned method because the first end (I) and second end (F) of the sheet (S) of the second continuous (T2) are located at the center portion (Sc) of the sheet (S) of the first continuous (T1).
[0051] Preferably, the step of providing a first continuous (T1) sheet (S) and a second continuous (T2) sheet (S) includes the following steps: - Provide the first strip (N1); - The first strip (N1) is repeatedly cut laterally at a distance equal to or approximately equal to the same length (SI) to obtain a first continuous sheet (T1) of the same or approximately the same length between the first end (I) and the second end (F). - Provide a second strip (N2); - Repeatedly cut the second strip (N2) at a distance equal to or approximately equal to the same length (SI) to obtain a second continuous sheet (S) of the same or approximately the same length between the first end (I) and the second end (F).
[0052] In this way, productivity can be maximized while maintaining the same performance compared to using a single strip.
[0053] The present invention also relates to an interlacing folding machine (1000) for producing a package (P) of interlaced folded sheet as described above, and typically, the interlacing folding machine (1000) is configured to implement the above method.
[0054] Embodiments of the staggered folding machine (1000) include: - An interlaced folding unit (10) that performs a W-shaped interlaced fold on the sheet (S) and includes: A first roller (1) has a side surface (11) for receiving a sheet (S), includes a member (15) for clamping the sheet (S) and rotates relative to a first axis of rotation (X1); The second roller (2) has a corresponding side surface (21) for receiving the sheet (S), includes a corresponding member (25) for clamping the sheet (S) and rotates relative to a second rotation axis (X2) parallel to the first rotation axis (X1), and the second rotation axis is held together with the first rotation axis (X1) on the mating plane (U); The first folding element (3) and Second folding element (4); - Support member (5) for supporting the staggered folded sheet (S) below the first roller (1) and the second roller (2); - A first supply line (100) for sheet (S) supplies a first continuous (T1) sheet (S) on a side surface (11). - A second supply line (200) for sheet (S) supplies a second continuous (T2) sheet (S) on the corresponding side surface (21).
[0055] The first roller (1) and the second roller (2) rotate at the same tangential speed (w1, w2), and their rotation directions are opposite to each other.
[0056] The first folding element (3) moves the sheet (S) from the side surface (11) to the support member (5) at the opposite first folding area (P1), and the second folding element (4) moves the sheet (S) away from the corresponding side surface (21) and toward the support member (5) at the second folding area (P2).
[0057] The first supply line (100) and the second supply line (200) are advantageously configured to supply sheets (S) of the same or substantially the same length (SI) between the first end (I) and the second end (F), and to allow the sheet (S) of the first supply line (100) to pass through the joint plane (U) in such a manner that it is offset by half or substantially offset by half the same length (SI) relative to the sheet (S) of the second supply line (200).
[0058] Furthermore, the clamping member (15) is configured to clamp the first end (I) and the second end (F) of the sheet (S) of the first supply line (100) and the sheet (S) of the second supply line (200) for the first portion (T1a) between the joint plane (U) and the first folding area (P1), thereby causing the first folding element (3) to alternately form a center crease (Scentr) on the sheet (S) of the first supply line (100) or the sheet (S) of the second supply line (200) located at the center between the first end (I) and the second end (F) of the sheet (S).
[0059] Those skilled in the art will understand how the second folding element (4) thus forms two creases (Sp) on each sheet (S), thereby obtaining a W-shaped staggered folded sheet (S) with two creases (Sp) between the first end (I) and the second end (F) and a center crease (Scentr) between the two creases (Sp), each of the two creases (Sp) and the center crease (Scentr) dividing the span of the sheet (S) into equal extensions, which are equal to one-quarter of the same length (SI), or the spans are approximately equal.
[0060] The staggered folding machine (1000) of the present invention is capable of producing a package (P) of staggered folded sheets (S) that has the aforementioned advantages and has a higher productivity than the case where the sheets (S) are folded in a staggered manner by means of a speed difference. In the staggered folding machine (1000) according to the present invention, the production limit is generally determined by the time required to hold the sheet (S) furthest from the roller (whether it is the first roller (1) or the second roller (2)); it is generally determined by the time required to transfer a sheet (S) from the first roller (1) to the second roller (2) and vice versa.
[0061] like Figure 8 , Figure 10 and Figure 13 As illustrated in the example, according to a known method, an interlaced folding unit with folding rollers clamps portions of two adjacent sheets (S) to alternately bring these portions into a first folding region (P1) or a second folding region (P2), and holds them in a first portion (T1a) and a corresponding first portion (T1b) until the first folding element (3) and the second folding element (4) remove the sheets (S). The first portion (T1a) and the corresponding first portion (T1b) theoretically correspond to the arcs between the joining plane (U) and the first folding region (P1) and between the joining plane (U) and the second folding region (P2). However, due to various reasons, such as the amount of movement of the sheets (S), the delay of the clamping members (15) and the corresponding clamping members (25), or the advantage of moving the sheets (S) of the first folding elements (3) and the second folding elements (4), the first portion (T1a) and the corresponding first portion (T1b) may terminate before or after the corresponding first folding region (P1) or second folding region (P2).
[0062] The first portion (T1a) preferably extends between the joining plane (U) and the first folded region (P1). The second portion (T2a) more preferably extends from the joining plane to the second folded region (P2).
[0063] The first part (T1a) typically extends from the joint plane (U), and the corresponding first part (T1b) also extends from the joint plane (U).
[0064] While another theoretical possibility is that the first supply line (100) and the second supply line (200) feed the sheet (S) between the first roller (1) and the second roller (2) at the joint plane (U), in practice, this option would lead to disadvantages in implementation or performance. In other words, Figure 6 and Figure 7 The options illustrated are feasible, such as using a plate conveyor or a vacuum belt conveyor, but there are still risks such as the inability to hold the sheet (S) or the sheet (S) not being accurately aligned.
[0065] Therefore, the preferred option is: - The first supply line (100) supplies the sheet (S) to the first roller (1) at the inlet region (I1), such that the side surface (11) receives at least a portion of the sheet (S) before it passes through the mating plane (U); and - The second supply line (200) supplies the sheet (S) to the second roller (2) at the corresponding inlet area (I2), so that the corresponding side surface (21) receives at least a portion of the sheet (S) before the sheet (S) passes through the joint plane (U).
[0066] In this way, at least a portion of each sheet (S) is arranged on the side surface (11) or the corresponding side surface (21) before the clamping member (15) or the corresponding clamping member (25) clamps the sheet (S) and the side-arranged sheet (S).
[0067] In the embodiment shown in the figures, the entrance region (I1) is located above the joining plane (U), i.e., on the side opposite to the support member (5); and the corresponding entrance region (I2) is located above the joining plane (U), i.e., on the side opposite to the support member (5). However, the entrance region (I1) and the corresponding entrance region (I2) may also be located on the side, although the upper position generally makes the best use of the vertical extension space of the staggered folding machine (1000).
[0068] The clamping member (15) more preferably clamps the first end (I) of the sheet (S) of the first supply line (100) from the entrance region (I1) to the end of the first part (T1a).
[0069] Therefore, this also occurs at the second end (F) and center portion (Sc) of the sheet (S) of the first supply line (100).
[0070] This ensures that half of the sheets (S) in the bundle (P) of the staggered folded sheets (S) can be precisely aligned, even with increased staggering speed and productivity.
[0071] Furthermore, when the sheet (S) passes directly between the first cutting roller (130) and the first roller (1), as described later, and between the second cutting roller (230) and the second roller (2), as described later, this ensures that the sheet (S) can be correctly positioned, such as... Figure 12 The example is shown below.
[0072] The clamping member (15) preferably includes suction holes (16, 17), which more preferably provide suction between the inlet region (I1) and the end of the first part (T1a).
[0073] Similarly, the corresponding clamping member (25) preferably includes a corresponding suction hole (26, 27) for suction in the corresponding first part (T1b).
[0074] However, the clamping member (15) or the corresponding clamping member (25) may include an opening or pliers, each plier being movable in the opening between a clamping position and a release position, and another roller having a protrusion for pushing the sheet (S) into the opening. In this case, the pliers are in the clamping position at least in the first portion (T1a), preferably in the inlet region (I1), or in the corresponding first portion (T1b). Due to the interference between the components, the use of pliers and protrusions (at least without further explanation) prevents direct passage between the first cutting roller (130) and the first roller (1) and between the second cutting roller (230) and the second roller (2) as described above; for example, this problem can be solved by inserting a specially shaped transfer roller.
[0075] More preferably, the suction holes (16, 17) are connected to an internal suction tube (150) having a suction arc (150a) that covers the passage of the suction holes (16, 17) from the inlet (I1) to the end of the first part (T1a).
[0076] Compared to other suction methods, the suction method with an internal tube (150) is advantageous for high-speed conveying of the sheet (S). In addition, the suction arc (150a) covering the channel of suction holes (16, 17) from the inlet (I1) to the end of the first section (T1a) ensures that the sheet (S) remains correctly positioned up to the first folded area (P1).
[0077] Due to the allowed high conveying speed, it is preferable that the suction along the corresponding first portion (T1b) utilizes a corresponding internal suction tube with a corresponding suction arc, such as... Figure 13 The example is shown below.
[0078] In one known implementation, the clamping member (15) may include multiple rows of suction holes (16, 17) arranged along a first axis of rotation (X1) and connected to a suction arc (150a), the suction arc forming a cylindrical opening that extends a portion of the circumference and connects to a suction conduit, i.e., to a member for distributing low-pressure air. In other words, the suction holes (16, 17) only draw in air when they are located on the side of the cylindrical opening during rotation.
[0079] Similarly, the corresponding clamping member (25) may include multiple rows of corresponding suction holes (26, 27) arranged along the second axis of rotation (X2) and connected to corresponding cylindrical openings that extend a portion of the circumference and are connected to corresponding suction conduits, i.e., connected to corresponding members for distributing low pressure.
[0080] In implementations of the staggered folding machine (1000) known to those skilled in the art, the clamping member (15) is arranged to divide the side surface (11) into two or more portions (11, 11b, 11c), each portion having a circumferential extension length equal to or approximately equal to half the same length (SI). Each of the two or more portions (11a, 11b, 11c) has two ends (12a, 13a, 12b, 13b, 12c, 13c) and equidistant portions (14a, 14b, 14c) equidistant or approximately equidistant from the two ends (12a, 13a, 12b, 13b, 12c, 13c).
[0081] The corresponding clamping members (25) are arranged to divide the corresponding side surface (21) into two or more parts (21a, 21b, 21c), each part having a circumferential extension length equal to or approximately equal to half of the same length (SI). Each of the two or more parts (21a, 21b, 21c) is configured to clamp the sheet (S) and has two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c) and corresponding equidistant portions (24a, 24b, 24c) equidistant or approximately equidistant from the two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c).
[0082] In technical terms, two or more parts (11a, 11b, 11c) and two or more parts (21a, 21b, 21c) are referred to as folded regions.
[0083] The first supply line (100) supplies half a sheet (S) or approximately half a sheet (S) in each of two or more sections (11a, 11b, 11c); and the second supply line supplies half a sheet (S) or approximately half a sheet (S) in each of two or more sections (21a, 21b, 21c).
[0084] The first axis of rotation (X1) and the second axis of rotation (X2) are spaced apart from each other, so that at the joint plane (U), the two side-arranged sheets (S) can be located between the side surface (11) and the corresponding side surface (21), the clamping member (15) can act on the sheet (S) closer to the corresponding side surface (21), and the corresponding clamping member (25) can act on the sheet (S) closer to the side surface (11).
[0085] The first roller (1) is oriented relative to the first axis of rotation (X1), and the second roller (2) is oriented relative to the second axis of rotation (X2), such that during their rotation, the ends (12a, 13a, 12b, 13b, 12c, 13c) pass through the joint plane (U) together with the corresponding equidistant portions (24a, 24b, 24c) facing the first roller (1), and vice versa, the corresponding ends (22a, 23a, 22b, 23b, 22c, 23c) pass through the joint plane (U) together with the equidistant portions (14a, 14b, 14c) facing the second roller (2).
[0086] The clamping member (15) is configured to remain clamped as each of the two ends (12a, 13a, 12b, 13b, 12c, 13c) moves along the first portion (T1a), and the corresponding clamping member (25) is configured to remain clamped as each of the two ends (22a, 23a, 22b, 23b, 22c, 23c) moves along the corresponding first portion (T1b) between the engagement plane (U) and the second folding area (P2).
[0087] The clamping member (15) preferably clamps only at two ends (12a, 13a, 12b, 13b, 12c, 13c), and the corresponding clamping member (25) preferably clamps only at two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c).
[0088] Therefore, while ensuring that the sheet (S) can move correctly, the function of the staggered folding machine (1000) is simpler, and if possible, the risk of the sheet (S) failing to be transferred from the first roller (1) to the second roller (2') or being transferred in the opposite direction is reduced.
[0089] like Figure 12As shown, when the first roller (1) receives the first end (I) and the second end (F) at the clamping member (15) in the inlet region (I1), this does not occur with the second roller (2). Typically, when the second roller (2) receives the sheet (S) in the portion between the corresponding inlet region (I2) and the engagement plane (U), the second roller (2) includes corresponding clamping members (28) at the corresponding equidistant portions (24a, 24b, 24c), which are configured to clamp the first end (I) and the second end (F) of the sheet (S) of the second supply line (200) from the corresponding inlet region (I2) to the engagement plane (U).
[0090] Figure 12 A clamping member including a suction block is shown at equidistant portions (14a, 14b, 14c). This suction block is similar to the suction block of the corresponding clamping member (28) and is not absolutely necessary. Obviously, when the suction block faces the other roller between the first roller (1) and the second roller (2), the suction block, like the corresponding clamping member (28), must be inactive as it passes through the mating plane (U) to be able to convey the sheet (S).
[0091] In the operating mode, the suction line connected to the suction block remains closed, while in a different operating mode, the suction line connected to the suction block remains open between the inlet area (I1) and the mating plane (U), and then closes when the sheet (S) is conveyed from the first roller (1) to the second roller (2).
[0092] The suction block has been shown to illustrate how the staggered folding machine (1000) of the present invention is applicable to a variety of types of production and is therefore more flexible than prior art solutions.
[0093] Figure 8 and Figure 10 The arcs are shown in shaded areas, with the first end (I) and the second end (F) and the first continuous (T1) sheet (S) on the first roller (1) on the left, and the second continuous (T2) sheet (S) on the second roller (2) on the right. In addition, the first section (T1a) and the corresponding first section (T1b) are shown in dashed lines in these figures.
[0094] Figure 8 and Figure 10 The shaded portion of the second roller (2) shows an example of the suction portion of the corresponding clamping member (28), which is capable of bringing the first end (I) and the second end (F) of the second continuous (T2) from the corresponding inlet region (I2) to the engagement plane (U).
[0095] With the help of Figure 9 and Figure 11 , Figure 8 and Figure 10 Two different embodiments of a first roller (1) are also shown, which is capable of carrying the first end (I) and the second end (F) of a first continuous (T1) sheet (S) from the entry region (I1) to the first folding region (P1). Figure 8 In this process, identical components of the clamping member (15), such as suction holes (16, 17), are held between the inlet region (I1) and the first folding region (P1). Figure 10 In this example, the same result is achieved by using more components of the clamping member (15); in the example shown, the suction holes (16, 17) are clamped along the joint plane (U), and other suction holes that are axially intersected with the suction holes (16, 17) are drawn upward from the joint plane (U) into the first folded area (P1).
[0096] The first supply line (100) preferably includes a first strip supply line (110) for supplying a first strip (N1) and a cutting member (130), the cutting member including a blade or opposing blade (131) and a first cutting roller (132), the first cutting roller including a first member (133) for clamping the sheet (S).
[0097] The first supply line (100) is configured to cut the first strip (N1) with a first cutting roller (132) and a blade or opposing blade (131) to produce a first continuous sheet (S) of the same or approximately the same length (SI).
[0098] In addition, the second supply line (200) includes a second strip supply line (210) for supplying the second strip (N2) and a second cutting member (230), the second cutting member including a corresponding blade or opposing blade (231) and a second cutting roller (232), the second cutting roller including a second device (233) for clamping the sheet (S).
[0099] The second supply line (200) is configured to cut the second strip (N2) with a second cutting roller (232) and a corresponding blade or opposing blade (231) to produce a second continuous sheet (S) of the same or approximately the same length (SI).
[0100] also: - The first roller (1) is located downstream of the first cutting roller (132) and receives the sheet (S) cut from the first cutting roller (132), more preferably directly from the first cutting roller; - The second roller (2) is located downstream of the second cutting roller (232) and receives the sheet (S) cut from the second cutting roller (232), more preferably directly from the second cutting roller; - The first cutting roller (132), the second cutting roller (232), the first roller (1) and the second roller (2) rotate at the same tangential speed (w1, w2) (expressed explicitly in scalar form).
[0101] A similar staggered folding machine (1000) is able to obtain precise sheets (S) and help to properly feed them onto the first roller (1) and the second roller (2).
[0102] In the accompanying drawings, the cylindrical side surface (11) of the first roller (1) is subdivided into three parts, as is the corresponding cylindrical side surface (21) of the second roller (2). Figure 12 In the middle, the first axis of rotation (X1) and the second axis of rotation (X2) are both perpendicular to the sheet and are in a horizontal state.
[0103] These figures illustrate the preference for the joining plane (U) to be a horizontal plane, and the way the sheets (S) pass vertically through that horizontal plane, arranged as a first continuous (T1) and a second continuous (T2), as they can be reached along a vertical or circular trajectory.
[0104] from Figure 12 As can be seen, the position of the first folded area (P1) can be defined by the angle formed between the joining plane (U) and the plane passing through the area separated by the first rotation axis (X1) and the sheet (S) and the side surface (11), and the position of the second folded area (P2) can be defined by the angle formed between the joining plane (U) and the plane passing through the area separated by the second rotation axis (X2) and the sheet (S) and the corresponding side surface (21).
[0105] Figure 13 It is also possible to observe the orientation of the first roller (1) and the second roller (2) relative to the first axis of rotation (X1) and the second axis of rotation (X2), respectively, and thus their orientation relative to each other. The angular position of the second roller (2) is such that the corresponding equidistant portions (24a, 24b, 24c) will pass through the joint plane (U) together with the two ends (12a, 13a, 12b, 13b, 12c, 13c) of the continuous portions of two or more portions (11a, 11b, 11c). Figure 13 In this case, it is important to note how two or more parts (11a, 11b, 11c) define the same circumferential angle (alfa) for each other.
[0106] The side surface (11) and the corresponding side surface (21) typically have the same diameter (11diam, 21diam).
[0107] exist Figure 12The clamping member (15) and the corresponding clamping member (25) shown by way of example in the embodiment include suction holes (16, 17) and corresponding suction holes (26, 27) that operate in the first part (T1A) and the corresponding first part (T1b), respectively.
[0108] Several methods are known to be used to implement the clamping member (15), the corresponding clamping member (25), the first clamping member (133) or the second clamping member (233), for example, as discussed in EP3724112B1, EP3067303B1 or EP1457444B2.
[0109] Figure 12 The holes shown in the first clamping member (133) and the second clamping member (233) are illustrated in an illustrative manner as they are of a known type.
[0110] Supporting member (5) in Figures 12 to 16 The diagram is shown schematically. The example diagram includes a vertically movable forming stage (51) and a separating stage (52) that can be moved at least horizontally to be positioned between a bundle (P) of the already formed, staggered folded sheet (S) on the forming stage (51) and the continuously arriving sheet (S).
[0111] The first folding element (3) and the second folding element (4) are known in the art and are described, for example, in EP2437994B1. Figures 12 to 16 As shown in the example, its movement is coordinated with the movement of the first roller (1) and the second roller (2) in the upper position inside the groove and the lower position between the first roller (1) or the second roller (2) and the support member (5).
[0112] It should be understood that the above description has been provided by way of non-limiting examples, and any structural variations are considered to fall within the protection scope of this technical solution, as required below.
Claims
1. A method for producing a package (P) of staggered folded sheets (S), said package comprising staggered folded sheets (S), each sheet having the same or substantially the same length (SI) between a first end (I) and a second end (F), wherein: - Each sheet (S) is folded in a W shape, having two creases (Sp) between the first end (I) and the second end (F) and a center crease (Scentr) between the two creases (Sp), wherein each of the two creases (Sp) and the center crease (Scentr) divides the span of the sheet (S) into equal spans, which are equal in length and are one-quarter of the equal length (SI), or the spans are approximately equal in length. - The first end (I) and the second end (F) of each sheet (S) are separated from the first end (I) and the second end (F) of the other sheets (S); - The sheet (S) is oriented in the same way, such that all of its center creases (Scentr) are on the same side relative to the corresponding two creases (Sp); - Except for the end sheet (S), each sheet (S) is folded in an alternating manner with two sheets (S) on the same side relative to the end sheet (S), and each of the two sheets (S) is folded in an alternating manner with the end sheet (S) by two spans. The method includes the following steps: - Provide a first continuous (T1) sheet (S) and a second continuous (T2) sheet (S), wherein the sheet (S) has the same or substantially the same length (SI) between a first end (I) and a second end (F), and has a central portion (Sc) located exactly in the middle between the first end (I) and the second end (F), and two intermediate portions (Si) located exactly in the middle between the first end (I) and the central portion (Sc) and exactly in the middle between the central portion (Sc) and the second end (F), respectively; - The sheets (S) of the first continuous (T1) and the second continuous (T2) are arranged sideways, such that the sheets (S) of the first continuous (T1) are offset from the sheets (S) of the second continuous (T2) by half of the same length (SI), or approximately offset from half of the same length (SI). - By pulling the side-layout sheets (S) of the first continuous (T1) and the second continuous (T2) together on the side of the first continuous (T1) at the first end (I) and the second end (F) and on the side of the second continuous (T2) at the middle portion (Si), the side-layout sheets (S) are folded in a W-shape, thereby forming two creases (Sp) and a center crease (Scentr) between the two creases (Sp) on each sheet (S).
2. The method according to the preceding claim, wherein, The step of providing the first continuous (T1) sheet (S) and the second continuous (T2) sheet (S) includes the following steps: - Provide the first strip (N1); - The first strip (N1) is repeatedly cut laterally at a distance equal to or approximately equal to the same length (SI) to obtain a first continuous sheet (S) of approximately the same extension length between the first end (I) and the second end (F). - Provide a second strip (N2); - The second strip (N2) is repeatedly cut laterally at a distance equal to or approximately equal to the same length (SI) to obtain a second continuous sheet (S) of the same or approximately the same extension length between the first end (I) and the second end (F).
3. A staggered folding machine (1000) for producing a package (P) of staggered folded sheets (S), said package comprising staggered folded sheets (S), each sheet having the same or substantially the same length (SI) between a first end (I) and a second end (F), wherein: - Each sheet (S) is folded in a W shape, having two creases (Sp) between the first end (I) and the second end (F) and a center crease (Scentr) between the two creases (Sp), wherein each of the two creases (Sp) and the center crease (Scentr) divides the span of the sheet (S) into equal extension lengths, which are equal to one-quarter of the equal length (SI), or the spans are approximately equal in length. - The first end (I) and the second end (F) of each sheet (S) are separated from the first end (I) and the second end (F) of the other sheets (S); - The sheets are oriented in the same way, such that all of their center creases (Scentr) are on the same side relative to the corresponding two creases (Sp); - Except for the end sheet (S), each sheet (S) is folded in an alternating manner with two sheets (S) on the same side relative to the end sheet (S), and each of the two sheets (S) is folded in an alternating manner with the end sheet (S) by two spans. The staggered folding machine (1000) includes: - An interlaced folding unit (10) for interlacing W-shaped folds of a sheet (S) folded into a W shape, and comprising: a first roller (1) having a side surface (11) for receiving the sheet (S), the first roller including a member (15) for clamping the sheet (S) and rotating relative to a first axis of rotation (X1); a second roller (2) having a corresponding side surface (21) for receiving the sheet (S), the second roller including a corresponding member (25) for clamping the sheet (S) and rotating relative to a second axis of rotation (X2) parallel to the first axis of rotation (X1), the second axis of rotation being held together with the first axis of rotation (X1) on a mating plane (U); a first folding element (3); and a second folding element (4); - Support member (5), the support member is used to support the staggered folded sheet (S) below the first roller (1) and the second roller (2); - A first supply line (100) for sheet (S) supplies a first continuous (T1) sheet (S) on the side surface (11). - A second supply line (200) for sheet (S), the second supply line supplies a second continuous (T2) sheet (S) on the corresponding side surface (21); in: - The first roller (1) and the second roller (2) rotate at the same tangential speed (w1, w2) in opposite directions; - The first folding element (3) moves the sheet (S) away from the side surface (11) and toward the support member (5) at the first folding area (P1); - The second folding element (4) moves the sheet (S) away from the corresponding side surface (21) and toward the support member (5) at the second folding area (P2); - The first supply line (100) and the second supply line (200) are configured to supply sheets (S) of the same or substantially the same length (SI) between a first end (I) and a second end (F), characterized in that the first supply line (100) and the second supply line (200) are configured to supply sheets (S) such that the sheet (S) of the first supply line (100) passes through the joint plane (U) in such a way that it is offset by half or substantially offset by half the same length (SI) relative to the sheet (S) of the second supply line (200); - The clamping member (15) is configured to clamp the first end (I) and the second end (F) of the sheet (S) of the first supply line (100) and the sheet (S) of the second supply line (200) for a first portion (T1a) between the engagement plane (U) and the first folding area (P1), such that the first folding element (3) alternately forms a center crease (Scentr) on the sheet (S) of the first supply line (100) or the sheet (S) of the second supply line (200) located at the center between the first end (I) and the second end (F) of the sheet (S).
4. The staggered folding machine (1000) according to the preceding claims, wherein, The first portion (T1a) extends from the joint plane (U) to the first folded region (P1).
5. The staggered folding machine (1000) according to claim 3 or 4, wherein: - The first supply line (100) supplies the sheet (S) to the first roller (1) at the inlet region (I1) such that the side surface (11) receives at least a portion of the sheet (S) before the sheet passes through the engagement plane (U); - The second supply line (200) supplies the sheet (S) to the second roller (2) at the corresponding inlet area (I2) such that the corresponding side surface (21) receives at least a portion of the sheet (S) before the sheet (S) passes through the joint plane (U); - The clamping member (15) clamps the first end (I) of the sheet (S) of the first supply line (100) from the inlet region (I1) to the end of the first portion (T1a).
6. The staggered folding machine (1000) according to claim 5, wherein, The clamping member (15) includes suction holes (16, 17) that allow suction from the inlet region (I1) to the end of the first portion (T1a).
7. The staggered folding machine (1000) according to the preceding claim, wherein, The suction holes (16, 17) are connected to an internal suction tube (150) having a suction arc (150a) that covers the passage of the suction holes (16, 17) from the inlet (I1) to the end of the first portion (T1a).
8. The staggered folding machine (1000) according to any one of claims 3 to 7, wherein: - The clamping member (15) is arranged to divide the side surface (11) into two or more parts (11a, 11b, 11c), each part having a circumferential extension length equal to or approximately equal to half of the same length (SI). - Each of the two or more portions (11a, 11b, 11c) has two ends (12a, 13a, 12b, 13b, 12c, 13c) and equidistant portions (14a, 14b, 14c) that are equidistant or substantially equidistant from the two ends (12a, 13a, 12b, 13b, 12c, 13c). - The corresponding clamping member (25) is arranged to divide the corresponding side surface (21) into two or more parts (21a, 21b, 21c), each part having a circumferential extension length equal to or approximately equal to half of the same length (SI); - Each of the two or more portions (21a, 21b, 21c) has two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c) and corresponding equidistant portions (24a, 24b, 24c) that are equidistant or substantially equidistant from the two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c). - The first supply line (100) supplies half a sheet (S) or approximately half a sheet (S) in each of the two or more sections (11a, 11b, 11c). - The second supply line supplies half a sheet (S) or approximately half a sheet (S) in each of the two or more sections (21a, 21b, 21c). - The first axis of rotation (X1) and the second axis of rotation (X2) are spaced apart from each other, so that at the joint plane (U), the two side-arranged sheets (S) can be located between the side surface (11) and the corresponding side surface (21), the clamping member (15) can act on the sheet (S) closer to the corresponding side surface (21), and the corresponding clamping member (25) can act on the sheet (S) closer to the side surface (11); - The first roller (1) is oriented relative to the first axis of rotation (X1), and the second roller (2) is oriented relative to the second axis of rotation (X2), such that during their rotation, the ends (12a, 13a, 12b, 13b, 12c, 13c) pass through the joint plane (U) together with the corresponding equidistant portions (24a, 24b, 24c) facing the first roller (1), and vice versa, the corresponding ends (22a, 23a, 22b, 23b, 22c, 23c) pass through the joint plane (U) together with the equidistant portions (14a, 14b, 14c) facing the second roller (2); - The clamping member (15) is configured to maintain a clamping state as at least one of the two ends (12a, 13a, 12b, 13b, 12c, 13c) moves along the first portion (T1a); and - The respective clamping member (25) is configured to remain clamped as each of the respective two ends (22a, 23a, 22b, 23b, 22c, 23c) moves along the respective first portion (T1b) between the engagement plane (U) and the second folding region (P2).
9. The staggered folding machine (1000) according to any one of claims 3 to 8, wherein, The clamping member (15) is clamped only at the two ends (12a, 13a, 12b, 13b, 12c, 13c), and the corresponding clamping member (25) is clamped only at the two corresponding ends (22a, 23a, 22b, 23b, 22c, 23c).
10. When also dependent on claim 5, the staggered folding machine (1000) according to claim 8 or 9, wherein, The second roller (2) includes a corresponding clamping member (28) at the corresponding equidistant portions (24a, 24b, 24c), the corresponding clamping member being configured to clamp the first end (I) and the second end (F) of the sheet (S) of the second supply line (200) from the corresponding inlet region (I2) to the engagement plane (U).
11. The staggered folding machine (1000) according to any one of claims 3 to 10, wherein: - The first supply line (100) includes a first strip supply line (110) and a cutting member (130), the first strip supply line supplies a first strip (N1), the cutting member includes a blade or opposing blade (131) and a first cutting roller (132), the first cutting roller includes a first member (133) for clamping the sheet (S); - The first supply line (100) is configured such that the first cutting roller (132) and the blade or opposing blade (131) cut the first strip (N1) to produce a first continuous sheet (S) of the same or substantially the same length (SI). - The second supply line (200) includes a second strip supply line (210) and a second cutting member (230), the second strip supply line supplies a second strip (N2), the second cutting member includes a corresponding blade or opposing blade (231) and a second cutting roller (232), the second cutting roller includes a second member (233) for clamping the sheet (S); - The second supply line (200) is configured such that the second cutting roller (232) and the corresponding blade or opposing blade (231) cut the second strip (N2) to produce a second continuous sheet (S) of the same or substantially the same length (SI); - The first roller (1) is located downstream of the first cutting roller (132) and receives the sheet (S) cut from the first cutting roller (132). - The second roller (2) is located downstream of the second cutting roller (232) and receives the sheet (S) cut from the second cutting roller (232). - The first cutting roller (132), the second cutting roller (232), the first roller (1) and the second roller (2) rotate at the same tangential speed (w1, w2).