Negative pressure shifting fork mechanism of folding machine

Abstract

The utility model belongs to the technical field of tissue processing equipment, and discloses a negative pressure shifting fork mechanism of a folding machine. The shifting fork assembly is connected with the negative pressure source through an air guide assembly; the shifting fork assembly comprises a shifting fork shaft and a shifting fork finger piece installed on the shifting fork shaft, an air channel communicated with the air guide assembly is formed in the shifting fork finger piece, and the air inlet tail end of the air channel is arranged on a finger pressing part of the shifting fork finger piece; when the shifting fork finger piece is driven by the shifting fork shaft to swing from an initial position to a finger pressing position, the air guide assembly communicates with the negative pressure source and the air channel, so that negative pressure is formed on the abutting acting face, where the finger pressing part shifts and presses the tissue, of the finger pressing part. In the process that the shifting fork finger piece is driven by the shifting fork shaft to swing from the finger pressing position to the initial position, the negative pressure source and the air channel are disconnected through the air guide assembly. In conclusion, random displacement of the paper in the high-speed folding process can be effectively eliminated through the shifting fork finger piece of the negative pressure structure.

Description

Technical Field

[0001] This utility model belongs to the technical field of paper towel processing equipment, specifically relating to a negative pressure shifting fork mechanism for a folding machine. Background Technology

[0002] In the paper and packaging industry, folding machines are key processing equipment, and their performance directly affects the folding accuracy and packaging quality of various types of paper. Traditional folding techniques face significant challenges, especially when processing low-stiffness materials such as ultrathin paper and cream paper. For example, the bending stiffness of these soft papers is generally below 7 N / m, and their tensile strength is less than 10 N / 15 mm, making them highly susceptible to deformation and displacement during folding.

[0003] In traditional folding machines, the fork mechanism typically employs a solid metal structure. Its working principle involves using the mechanical contact of the fork fingers to forcibly peel the paper, which has reached a specific position, from the surface of the folding roller. This design has two main drawbacks: firstly, the mechanical contact pressure between the solid fork and the paper usually exceeds 0.5 N / cm². 2 Firstly, the mechanically forced peeling method easily causes wrinkles in low-stiffness paper. Secondly, it causes random displacement of the paper when it leaves the folding roller, resulting in deviations in the folding line position. Moreover, this technical defect is more pronounced under high-speed folding conditions (>200 times / minute), especially when processing cream paper with a thickness of less than 0.08mm. The rigid contact of the traditional solid fork mechanism not only fails to guarantee folding quality but may also cause material damage due to mechanical interference, thus severely restricting the production efficiency and product yield of high-end packaging materials. Utility Model Content

[0004] In view of this, in order to solve the problems mentioned in the background art, the purpose of this utility model is to provide a negative pressure shift fork mechanism for a folding machine.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a negative pressure shift fork mechanism for a folding machine, comprising: a negative pressure source; a shift fork assembly connected to the negative pressure source via an air guide assembly; the shift fork assembly includes a shift fork shaft and shift fork fingers mounted on the shift fork shaft, the shift fork fingers having an air passage communicating with the air guide assembly, the air inlet end of the air passage being disposed on the pressing finger portion of the shift fork fingers; wherein, during the process of the shift fork fingers swinging from the initial position to the pressing finger position driven by the shift fork shaft, the air guide assembly connects the negative pressure source and the air passage to form negative pressure on the contact surface of the pressing finger portion pressing the tissue paper; during the process of the shift fork fingers swinging from the pressing finger position to the initial position driven by the shift fork shaft, the air guide assembly disconnects the negative pressure source and the air passage.

[0006] Preferably, the air passage further includes an air outlet connected to the air inlet end via a connecting section, the air outlet end facing away from the air inlet end.

[0007] Preferably, the shift fork finger further includes a mounting portion and a connecting portion connecting the mounting portion and the pressing finger portion. The mounting portion is mounted on the shift fork shaft, and the connecting section and the air outlet are both disposed on the connecting portion.

[0008] Preferably, along the extending direction of the connecting portion, the connecting segment extends from the air inlet end to the air outlet end and passes through the connecting portion. The end of the connecting segment that passes through the connecting portion is provided with a plug, which restricts the airflow passing through the air passage from the air inlet end to the air outlet end.

[0009] Preferably, the shift fork shaft is constructed as a hollow shaft with an internally hollow interior, and an air pipe connector is provided on the peripheral wall of the shift fork shaft that can be connected to the air outlet end of the air passage through an air pipe.

[0010] Preferably, the shift fork shaft includes a drive end and an air guide end located at both ends, and the air guide end is provided with an air guide chamber connecting the air guide assembly and the hollow interior of the shift fork shaft.

[0011] Preferably, the shift fork assemblies are arranged in two sets in an alternating manner, and the air guiding assembly connects the negative pressure source to the air passage of one set of shift fork assemblies according to the operating status of the two sets of shift fork assemblies.

[0012] Preferably, the air guiding assembly includes a rotatably mounted hollow air shaft, an air outlet chamber connected to the air outlet end of the hollow air shaft, and two air inlet chambers sleeved outside the hollow air shaft. The air outlet chamber is connected to the negative pressure source, and the air inlets of the two air inlet chambers are respectively connected to two sets of shift fork assemblies. Two slots on the peripheral wall of the hollow air shaft are alternately connected to the air inlets of the two air inlet chambers by the rotation of the hollow air shaft.

[0013] Preferably, the air inlets of the two air inlets are arranged side by side along the axial direction on one side of the hollow air shaft, and the two slots are arranged opposite each other on the peripheral wall of the hollow air shaft.

[0014] Preferably, the two sets of fork assemblies are respectively coupled to two sets of folding rollers for folding the tissue paper, and one set of folding rollers is connected to the hollow air shaft via a belt drive assembly.

[0015] Compared with existing technologies, this invention has the following advantages: This invention provides a negative pressure fork mechanism for a folding machine. This mechanism mainly consists of three parts: a negative pressure source, a fork assembly, and an air guide assembly. The fork assembly includes a fork shaft and specially designed fork fingers. Unlike traditional solid forks, the fork fingers of this mechanism have precision air channels inside, connected to the negative pressure source through the air guide assembly. This, combined with the air inlet ends of multiple pressure fingers, forms a uniformly distributed negative pressure adsorption zone, thereby achieving precise paper positioning. When the fork fingers contact the paper, the negative pressure system immediately generates a stable adsorption force, keeping the paper in a predetermined position during the peeling process from the folding roller. This negative suction positioning method avoids the stress concentration problem caused by traditional mechanical forced peeling, and is particularly suitable for processing low-stiffness materials such as ultra-thin paper and cream paper. It not only effectively eliminates random displacement of the paper during high-speed folding but also significantly reduces the risk of surface damage caused by mechanical contact, greatly improving production yield. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0017] Figure 2 This is the second structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the shift fork assembly in this utility model;

[0019] Figure 4 This is a planar sectional view of the shift fork finger component in this utility model;

[0020] Figure 5 This is a schematic diagram of the air guiding component in this utility model;

[0021] Figure 6 This is a schematic diagram of the hollow air shaft in this utility model;

[0022] Figure 7 This is a schematic diagram of the assembly structure of the two air intake chambers in this utility model.

[0023] In the diagram: negative pressure source-1; shift fork assembly-2; shift fork shaft-201; shift fork finger-202; air passage-203; pressure finger-204; mounting part-205; connecting part-206; air pipe connector-207; air guide chamber-208; plug-209; air guide assembly-3; hollow air shaft-301; air outlet chamber-302; air inlet chamber-303; slot-304; belt drive assembly-4. Detailed Implementation

[0024] To further understand the content of this utility model, a detailed description of it is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art; they are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to the embodiments of this application described herein.

[0025] like Figure 1 and Figure 2 As shown, the present invention provides a negative pressure shifting fork mechanism for a folding machine, comprising a negative pressure source 1, a shifting fork assembly 2, an air guiding assembly 3, and a belt drive assembly 4. Specifically, two sets of shifting fork assemblies 2 are arranged opposite each other in an alternating manner, and the two sets of shifting fork assemblies 2 are respectively connected to two sets of folding rollers for folding tissues. One set of folding rollers is connected to the air guiding assembly 3 via the belt drive assembly 4, so that the air guiding assembly 3 connects the negative pressure source 1 to one set of shifting fork assemblies 2 according to the operating state of the two sets of shifting fork assemblies 2.

[0026] For example, based on the movement states of the two sets of folding rollers, the two sets of shift fork assemblies 2 alternately operate in the paper-shifting movement state and the reset movement state. For ease of description, the two sets of shift fork assemblies 2 are referred to as the first shift fork assembly and the second shift fork assembly, respectively. When the first shift fork assembly performs the paper-shifting movement state (the second shift fork assembly performs the reset movement state), the air guide assembly 3, under the linkage drive of the belt drive assembly 4 and the folding rollers, connects the negative pressure source 1 to the first shift fork assembly. That is, the negative pressure source 1 is used to create negative pressure in the first shift fork assembly, thereby preventing the paper towel from becoming disordered or shifted during the paper-shifting process. Similarly, when the second shift fork assembly performs the paper-shifting movement state (the first shift fork assembly performs the reset movement state), the air guide assembly 3, under the linkage drive of the belt drive assembly 4 and the folding rollers, connects the negative pressure source 1 to the second shift fork assembly. That is, the negative pressure source 1 is used to create negative pressure in the second shift fork assembly, thereby preventing the paper towel from becoming disordered or shifted during the paper-shifting process.

[0027] Continue to refer to Figure 3 and Figure 4 As shown, the shift fork assembly 2 includes a shift fork shaft 201 and a shift fork finger 202 mounted on the shift fork shaft 201. The shift fork finger 202 has an air passage 203 communicating with the air guide assembly 3. The air inlet end of the air passage 203 is located on the pressing finger portion 204 of the shift fork finger 202. Specifically, in this structural design, the paper-shifting motion state of the shift fork assembly 2 is configured such that the shift fork finger 202 swings from the initial position to the pressing finger position driven by the shift fork shaft 201. The reset motion state is configured such that the shift fork finger 202 swings from the pressing finger position back to the initial position driven by the shift fork shaft 201. The connection between the air guide assembly 3 and the negative pressure source 1 and the shift fork assembly 2 is specifically manifested as the connection between the air guide assembly 3 and the air passage 203 within the shift fork finger 202.

[0028] According to the above structure, during the process of the fork finger 202 swinging from the initial position to the pressing finger position driven by the fork shaft 201, the air guiding component 3 connects the negative pressure source 1 and the air channel 203 to form negative pressure on the contact surface of the pressing finger 204 pressing the paper towel; during the process of the fork finger 202 swinging from the pressing finger position to the initial position driven by the fork shaft 201, the air guiding component 3 disconnects the negative pressure source 1 and the air channel 203. Thus, by using the negative pressure structure of the two sets of fork components 2, the paper is always kept in a predetermined position during the peeling and folding roller process. This negative suction limiting method avoids the stress concentration problem caused by traditional mechanical forced peeling, and is particularly suitable for processing low stiffness materials such as ultra-thin paper and cream paper. It can not only effectively eliminate random displacement of paper during high-speed folding, but also significantly reduce the risk of surface damage caused by mechanical contact, and greatly improve production yield.

[0029] refer to Figure 4 As shown, in some embodiments, the air duct 203 further includes an air outlet connected to the air inlet end via a connecting section, the air outlet facing away from the air inlet end. This effectively avoids airflow interference, making the adsorption force field distribution more uniform and stable, thereby ensuring that the paper maintains precise positioning during the peeling process, while significantly improving the response speed and working efficiency of the negative pressure system.

[0030] refer to Figure 4As shown, in some embodiments, the shift fork finger 202 further includes a mounting portion 205 and a connecting portion 206 connecting the mounting portion 205 and the pressure finger portion 204. The mounting portion 205 is mounted on the shift fork shaft 201, and the connecting section and the air outlet are both disposed on the connecting portion 206. It should be noted that, along the extending direction of the connecting portion 206, the connecting section extends from the air inlet end to the air outlet end and penetrates the connecting portion 206. The end of the connecting section penetrating the connecting portion 206 is provided with a plug 209, which restricts the airflow passing through the air passage 203 from the air inlet end to the air outlet end. Specifically, the mounting portion 205 is fixed to the shift fork shaft 201 by a precision fitting structure to ensure the stability of the overall structure; the connecting portion 206 adopts a special streamlined design, which not only ensures structural strength but also optimizes the configuration of the air passage 203. The air passage 203 has an optimized unidirectional airflow channel, which ensures a stable output of negative pressure adsorption force. The connection section runs through the connection part 206, which allows the traditional solid shift fork finger to be upgraded to a negative pressure design with only simple modifications, greatly reducing the equipment modification cost, while also ensuring the stability and reliability of the negative pressure system. In addition, the plug structure 209 not only serves as a seal, but also as a control point for adjusting the airflow.

[0031] refer to Figure 3 As shown, in some embodiments, the shift fork shaft 201 is constructed as a hollow shaft with an internally hollow interior. An air pipe connector 207 is provided on the peripheral wall of the shift fork shaft 201, which can be connected to the air outlet end of the air passage 203 via an air pipe. The shift fork shaft 201 includes a drive end and an air guide end located at both ends. The air guide end is provided with an air guide chamber 208 connecting the air guide assembly 3 to the hollow interior of the shift fork shaft 201. This cleverly connects the air guide assembly 3 to the air passages 203 of multiple shift fork fingers 202, thereby facilitating the formation of a multi-point uniform negative pressure adsorption zone at the end of the shift fork assembly 2. This layout not only ensures a uniform distribution of negative pressure, effectively avoiding wrinkles, shifts, or breaks in the paper towel during high-speed movement, but also significantly improves the equipment's adaptability to paper of different thicknesses. Simultaneously, it simplifies the maintenance of the entire system, allows for precise airflow adjustment, and greatly improves production efficiency and product quality stability.

[0032] refer to Figures 5-7As shown, in some embodiments, the air guiding assembly 3 includes a rotatably mounted hollow air shaft 301, an air outlet chamber 302 connected to the air outlet end of the hollow air shaft 301, and two air inlet chambers 303 sleeved on the outside of the hollow air shaft 301. The belt drive assembly 4 is drivenly connected to the end of the hollow air shaft 301 opposite to the air outlet end. The air outlet chamber 302 is connected to the negative pressure source 1. The air inlets of the two air inlet chambers 303 are respectively connected to two sets of shift fork assemblies 2. Two slots 304 on the peripheral wall of the hollow air shaft 301 are alternately connected to the air inlets of the two air inlet chambers 303 by the rotation of the hollow air shaft 301. It should be noted that the air inlets of the two air inlet chambers 303 are arranged side by side along the axial direction on one side of the hollow air shaft 301, and the two slots 304 are arranged opposite each other on the peripheral wall of the hollow air shaft 301. Therefore, during the continuous rotation of the folding roller, the hollow air shaft 301 is driven to rotate continuously by the belt drive assembly 4. For ease of description, the two air inlets 303 are referred to as the first air inlet and the second air inlet, respectively. When the hollow air shaft 301 rotates to the first position, one slot 304 on the hollow air shaft 301 is aligned and connected with the air inlet of the first air inlet, that is, the first shift fork assembly is connected to the air outlet 302 through the first air inlet and the hollow air shaft 301. When the hollow air shaft 301 continues to rotate 180° to the second position, the other slot 304 on the hollow air shaft 301 is aligned and connected with the air inlet of the second air inlet, that is, the second shift fork assembly is connected to the air outlet 302 through the second air inlet and the hollow air shaft 301, thereby effectively realizing the automatic air exchange of the two sets of shift fork assemblies 2.

[0033] In summary, the negative pressure fork mechanism of this folding machine mainly consists of three parts: a negative pressure source 1, a fork assembly 2, and an air guiding assembly 3. The fork assembly 2 includes a fork shaft 201 and specially designed fork fingers 202. Unlike traditional solid forks, the fork fingers 202 have precision air channels inside and are connected to the negative pressure source 1 through the air guiding assembly 3. This, together with the air inlet ends of multiple pressure fingers 204, can form a uniformly distributed negative pressure adsorption area, thereby achieving precise paper positioning. The two sets of fork assemblies 2 work alternately with negative suction, maintaining a stable negative pressure adsorption force even at high speeds. This solves the problem of paper deformation and wrinkling caused by traditional mechanical clamping methods, and ensures the reliability and production efficiency of the equipment. It is effectively suitable for high-speed, high-precision folding machine operating environments.

[0034] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A negative pressure yoke mechanism for a folding machine, characterized by, include: A negative pressure source (1); a shift fork assembly (2), connected to the negative pressure source (1) via an air guide assembly (3); the shift fork assembly (2) includes a shift fork shaft (201) and a shift fork finger (202) mounted on the shift fork shaft (201), wherein the shift fork finger (202) is provided with an air passage (203) communicating with the air guide assembly (3), and the air inlet end of the air passage (203) is provided on the pressing finger portion (204) of the shift fork finger (202); wherein, the shift fork finger During the process of the component (202) swinging from the initial position to the pressure finger position driven by the fork shaft (201), the air guide assembly (3) connects the negative pressure source (1) and the air passage (203) to form negative pressure on the contact surface of the pressure finger part (204) pressing the tissue; during the process of the fork finger component (202) swinging from the pressure finger position to the initial position driven by the fork shaft (201), the air guide assembly (3) disconnects the negative pressure source (1) and the air passage (203).

2. The negative pressure pawl mechanism of a folding machine according to claim 1, characterized in that: The air passage (203) also includes an air outlet connected to the air inlet end via a connecting section, the air outlet facing away from the air inlet end.

3. A negative pressure pawl mechanism for a folding machine according to claim 2, characterized in that: The shift fork finger (202) also includes a mounting part (205) and a connecting part (206) connecting the mounting part (205) and the pressing finger part (204). The mounting part (205) is mounted on the shift fork shaft (201), and the connecting section and the air outlet are both provided on the connecting part (206).

4. The negative pressure pawl mechanism of a folding machine according to claim 3, characterized in that: Along the extension direction of the connecting part (206), the connecting section extends from the air inlet end to the air outlet end and passes through the connecting part (206). The end of the connecting section that passes through the connecting part (206) is provided with a plug (209). The plug (209) restricts the airflow passing through the air passage (203) from the air inlet end to the air outlet end.

5. The negative pressure pawl mechanism of a folding machine according to claim 2, characterized in that: The shift fork shaft (201) is constructed as a hollow shaft with a hollow interior, and an air pipe connector (207) is provided on the peripheral wall of the shift fork shaft (201) so as to be connected to the air outlet end of the air passage (203) through an air pipe.

6. A negative pressure pawl mechanism for a folding machine according to claim 5, characterized in that: The shift fork shaft (201) includes a drive end and an air guide end located at both ends. The air guide end is provided with an air guide chamber (208) connecting the air guide assembly (3) and the hollow interior of the shift fork shaft (201).

7. The negative pressure pawl mechanism of a folding machine according to claim 1, characterized in that: The shift fork assembly (2) is arranged in two sets in an alternating manner. The air guide assembly (3) connects the negative pressure source (1) to the air passage (203) of one of the shift fork assemblies (2) according to the operating status of the two sets of shift fork assemblies (2).

8. A negative pressure pawl mechanism for a folding machine according to claim 7, characterized in that: The air guiding assembly (3) includes a rotatably mounted hollow air shaft (301), an air outlet chamber (302) connected to the air outlet end of the hollow air shaft (301), and two air inlets (303) sleeved on the outside of the hollow air shaft (301). The air outlet chamber (302) is connected to the negative pressure source (1), and the air inlets of the two air inlets (303) are respectively connected to two sets of shift fork assemblies (2). There are two slots (304) on the peripheral wall of the hollow air shaft (301). By rotating the hollow air shaft (301), the two slots (304) are alternately connected to the air inlets of the two air inlets (303).

9. A negative pressure pawl mechanism for a folding machine according to claim 8, characterized in that: The air inlets of the two air inlets (303) are arranged side by side along the axial direction on one side of the hollow air shaft (301), and the two slots (304) are arranged opposite each other on the peripheral wall of the hollow air shaft (301).

10. The negative pressure pawl mechanism of a folding machine according to claim 8, characterized in that: The two sets of fork assemblies (2) are respectively connected to two sets of folding rollers for folding tissues, one of which is connected to the hollow air shaft (301) via a belt drive assembly (4).

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