Multi-axis linkage self-positioning type film cutting device and photogravure press

Abstract

The invention relates to the field of film cutting, in particular to a multi-shaft linkage self-positioning type film cutting device and a photogravure press, the multi-shaft linkage self-positioning type film cutting device comprises a rack, a conveying mechanism and a cutting tool, the conveying mechanism and the cutting tool are arranged on the rack, a platform is arranged on the rack, a positioning mechanism is arranged on the platform, and the positioning mechanism comprises two sets of rolling shafts used for clamping a film; one group of rolling shafts are movable rolling shafts located at the front end of a thin film conveying path, the other group of rolling shafts are fixed rolling shafts located at the tail end of the thin film conveying path, and an anti-deviation structure used for being in linkage with a cutting tool in a matched mode to further fix the thin film is arranged over the platform and located between the movable rolling shafts and the fixed rolling shafts. The fixed rolling shaft and the movable rolling shaft cooperatively work to jointly clamp the film and prevent deviation, then the trigger piece moves along with the cutting tool to synchronously drive all the extrusion pieces to make close contact with the film, the air bag expands along with the trigger piece to tightly abut against the film, and the fixing effect is further enhanced.

Description

Technical Field

[0001] The invention relates to the field of film cutting, and in particular to a multi-axis linkage self-positioning film cutting device and a gravure printing machine. Background Art

[0002] Traditional film positioning and cutting are often subject to manual adjustment, resulting in low cutting accuracy, especially when processing wide films or multiple batches of continuous printing, precision control is particularly difficult. In addition, during the film cutting process, the film in a relatively loose state after positioning is prone to causing the cutting tool to get stuck, the film cannot be cut in one step, and the cutting cut is prone to wrinkles and shrinkage, which in turn causes the cut film to fail to meet the molding processing requirements.

[0003] The currently disclosed Chinese authorization announcement number is CN111203930B, which is a plastic film cutting device and a cutting processing method, including a workbench, a clamping device and a cutting device. The clamping device is installed on the workbench, and the cutting device is installed at equal distances from left to right on the upper end face of the workbench. The clamping device includes an L-shaped vertical plate, a rotating shaft, a plastic film roll, a U-shaped card plate and a card column. The L-shaped vertical plate is symmetrically installed on the left end face of the workbench. The rotating shaft is installed between the L-shaped vertical plates by sliding cooperation. The plastic film roll is installed on the rotating shaft. The front and rear end faces of the U-shaped card plate are symmetrically provided with a No. 1 waist-shaped groove. The right section of the No. 1 waist-shaped groove is connected to the card column by sliding cooperation. The inner end of the card column is installed on the right end of the outer end face of the workbench. The inner end face of the U-shaped card plate and the right end of the workbench are in sliding cooperation. The plastic film on the plastic film roll is pulled to the right manually. The lower end of the plastic film moves along the upper end surface of the workbench until the right end of the plastic film exceeds the right end of the workbench and the right end surface of the plastic film is flush with the lower end surface of the upper end of the workbench, and then the U-shaped pallet is pressed to the left manually, so that the clamping column is stuck in the front section of the No. 1 waist-shaped groove. At this time, the inverted U-shaped pallet clamps the right end of the plastic film between it and the right end of the workbench, thereby clamping the right end of the plastic film to avoid the plastic film from rebounding to the left. At the same time, it also reduces the probability of the plastic film offset on the workbench, which is beneficial to the subsequent cutting of the plastic film.

[0004] According to the above patent, the above patent clamps the right end of the plastic film between it and the right end of the workbench by setting an inverted U-shaped pallet, thereby reducing the probability of the plastic film being offset on the workbench. The U-shaped movable plate that is set to make reciprocating movements left and right plays a role in smoothing the plastic film as a whole, so that the edge of the plastic film is also in a taut state, thereby reducing the probability of the cutter getting stuck during the cutting process. However, the inverted U-shaped pallet and the U-shaped movable plate are only suitable for plastic films within a specific width range. If the film width exceeds or is less than the design range, it may result in loose clamping or inability to be completely smoothed. In other prior arts, the film positioning and leveling devices that are often used have complex and large structures, and the coordination between each other is unreasonable. Therefore, there is a need for a device that can use multiple positioning and leveling means to reliably position the film during the film cutting process to achieve precise film cutting. Summary of the invention

[0005] In view of the problems existing in the prior art, a multi-axis linkage self-positioning film cutting device is provided, in which a fixed roller and a movable roller work together to clamp the film to prevent deviation. Then the trigger part moves with the cutting tool to synchronously drive all the extrusion parts to come into close contact with the film. The airbag also expands and presses tightly against the film, further enhancing the fixing effect.

[0006] In order to solve the problems of the prior art, the present invention provides a multi-axis linkage self-positioning film cutting device, comprising a frame, a transmission mechanism and a cutting tool arranged on the frame, wherein a platform for placing the film during cutting is arranged on the frame and below the cutting tool, the cutting direction of the cutting tool is perpendicular to the platform, and a positioning mechanism for fixing the film during cutting is arranged on the platform, wherein the positioning mechanism comprises two groups of rollers for clamping the film, one group of rollers is a movable roller located at the front end of the film transmission path, and the other group of rollers is a fixed roller located at the rear end of the film transmission path. Roller, the movable roller can move relative to the fixed roller along the film transmission direction, the platform is provided with a linear driver for driving the movable roller to move, the cutting tool can move with the movable roller, the distance between the movable roller and the fixed roller is the width of the film to be cut, and an anti-deviation structure is provided directly above the platform and between the movable roller and the fixed roller for cooperating with the cutting tool to further fix the film. When the cutting tool cuts the film, the anti-deviation structure is in close contact with the film, so that the film does not shrink during the cutting process.

[0007] Preferably, the movable roller and the fixed roller are both composed of two rotating rollers that are parallel to each other in the upper and lower directions. The top surface of the rotating roller located below is flush with the upper surface of the platform, and the rotating roller located above can move vertically relative to the rotating roller located below. The platform is provided with a first vertical guide rail for sliding connection of both ends of the rotating roller of the fixed roller and a second vertical guide rail for sliding connection of both ends of the rotating roller of the movable roller. The first vertical guide rail is fixedly connected to the platform, and the linear drive has a transverse guide rail for sliding connection of the second vertical guide rail. A downward drive for driving the rotating roller to move is provided on the first vertical guide rail and the second vertical guide rail.

[0008] Preferably, the cutting tool has a tool holder arranged between a pair of second vertical guide rails and a tool head connected to the lower end of the tool holder, each second vertical guide rail is provided with a cylinder for driving the tool holder to move vertically, the anti-deviance structure has an extrusion member that can be in close contact with the film and a trigger member arranged on the tool holder and cooperating with the extrusion member, when the tool holder moves downward, the extrusion member is in a synchronous downward pressure state driven by the trigger member.

[0009] Preferably, a vertically movable cross bar is provided between a pair of first vertical guide rails and between a pair of second vertical guide rails, each of the first vertical guide rail and the second vertical guide rail has a sliding portion for sliding connection with the corresponding cross bar, a spring is connected between the sliding portion and the corresponding cross bar, and each cross bar is provided with an extrusion piece near its two ends, and when the extrusion piece applies pressure on the film, the spring is in a stretched state.

[0010] Preferably, the trigger member is a rod structure extending from the tool holder toward the tail end of the film transmission path, and the bottom of the trigger member has a flexible pad layer that can contact all cross bars. When the tool head cuts the film, the trigger member continuously applies pressure to all cross bars under the action of the flexible pad layer, so that the four corners of the cut film are fixed by the extrusion member.

[0011] Preferably, each crossbar has a guide shaft extending upward through the corresponding sliding portion, the sliding portion is provided with a guide opening for the guide shaft to pass through, and the extrusion piece is specifically a buffer pad structure connected to the lower end of the guide shaft.

[0012] Preferably, an airbag wrapping the extrusion piece is connected between every two guide shafts located on the same side of the platform, and the guide shaft has an air passage connected to the airbag through the extrusion piece. When the extrusion piece squeezes the film onto the platform, the airbag is ventilated and expanded, so that the film is further fixed on the platform.

[0013] Preferably, two of the trigger members are symmetrically arranged on the tool holder, and each of the trigger members has a nozzle along its length direction for ventilating and smoothing the film. The direction of the airflow ejected from the nozzle is inclined from the inside to the outside on the upper surface of the platform. The two trigger members can move synchronously and oppositely along the edge direction on the tool holder, and a sliding frame connected to the trigger member and a bidirectional driver for driving the two sliding frames to move are slidably provided on the tool holder.

[0014] Preferably, side guide rails capable of contacting the edge of the film are provided on both sides of the platform along the direction of film transmission, the side guide rails have guide grooves for limiting the edge of the film, the front end of the side guide rails have guide edges for guiding the film into the guide grooves, and the bottom of the side guide rails has a plurality of negative pressure ports along its length direction for adsorbing the film from the lower surface.

[0015] The invention also provides a gravure printing machine, comprising a printing plate cylinder, an ink tank, a scraper and an impression cylinder, and also comprising a multi-axis linkage self-positioning film cutting device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention clamps the film together by a fixed roller and a movable roller, so that the film is stably clamped between the two. The movable roller and the fixed roller work together to ensure that the film always maintains a stable clamping state in the entire cutting area. It ensures that the film in the cutting area is flat and does not deviate. During the cutting process, the anti-deviation structure follows the movement of the cutting tool and applies appropriate pressure to the film synchronously, thereby enhancing stability, preventing shrinkage, and ensuring a perfect cutting effect. By adjusting the position of the movable roller relative to the fixed roller, the cutting tool can achieve precise cutting requirements for films of different widths, thereby improving the accuracy of film cutting; 2. The present invention uses a trigger to synchronously press down all crossbars, so that the extrusion parts are in close contact with the film. As the crossbars move downward synchronously with the cutter head, all extrusion parts act on different points of the film to apply a uniform and stable pressing force. As the extrusion parts continue to press the film while it is being cut, the film is prevented from shifting or shrinking during the cutting process. The synchronous action of the cutting tool and the anti-drift structure is achieved, ensuring efficient, accurate and stable film cutting; 3. The present invention further enhances the fixing effect of the film by pressing the film tightly against the inflated airbag. The airbag can provide relatively uniform pressure distribution during the expansion process, ensuring that each part of the film is subjected to consistent pressure and covering a larger area, which not only increases the contact area with the film but also enhances the overall fixing effect. Since the airbag has good flexibility and elasticity, when the movable roller adjusts the spacing of the cut film width relative to the fixed roller, the airbag can automatically adjust its shape to adapt to the new position and pressure distribution, ensuring that a stable pressing force is always maintained during the entire cutting process; 4. The present invention sprays air toward the film through the nozzle on the trigger member, and the airflow blows obliquely from the inside to the outside toward the film, effectively smoothing the film and removing possible wrinkles. As the bidirectional drive accurately controls the moving speed and position of the two sliding racks, it ensures that the airflow can act on the film evenly and consistently, so that the film is gradually flattened on the platform, ensuring the accuracy of the cutting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a first three-dimensional structural schematic diagram of a multi-axis linkage self-positioning film cutting device of the present invention; Figure 2 It is a second three-dimensional structural schematic diagram of a multi-axis linkage self-positioning film cutting device of the present invention; Figure 3 It is a partial three-dimensional structural cross-sectional view of a multi-axis linkage self-positioning film cutting device of the present invention; Figure 4 It is a partial three-dimensional structural schematic diagram of a positioning mechanism and an anti-deviating structure of a multi-axis linkage self-positioning film cutting device of the present invention; Figure 5 It is a partial three-dimensional structural cross-sectional view of a positioning mechanism and an anti-deviating structure of a multi-axis linkage self-positioning film cutting device of the present invention; Figure 6 The present invention Figure 5 A magnified schematic diagram of point A; Figure 7 The present invention Figure 5 An enlarged schematic diagram of point B; Figure 8 It is a partial three-dimensional structural schematic diagram of a side guide rail of a multi-axis linkage self-positioning film cutting device of the present invention; Fig. 9 It is a partial three-dimensional structural cross-sectional view of an anti-deviating structure of a multi-axis linkage self-positioning film cutting device of the present invention; Fig.10 The present invention Fig. 9 Enlarged schematic diagram of point C.

[0018] The numbers in the figure are: 1, film; 2, cutting tool; 21, tool holder; 211, sliding frame; 22, tool head; 23, cylinder; 3, platform; 31, first vertical guide rail; 32, second vertical guide rail; 33, transverse guide rail; 34, side guide rail; 341, guide edge; 342, negative pressure port; 4, positioning mechanism; 41, movable roller; 411, rotating roller; 42, fixed roller; 5, anti-drift structure; 51, extrusion member; 52, trigger member; 521, flexible cushion layer; 522, nozzle; 53, cross bar; 531, guide shaft; 5311, airway; 532, airbag; 54, sliding part; 541, spring. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] See also Figure 1-Figure 6 As shown, a multi-axis linkage self-positioning film cutting device comprises a frame, a transmission mechanism arranged on the frame, and a cutting tool 2. A platform 3 for placing a film 1 during cutting is arranged on the frame and below the cutting tool 2. The cutting direction of the cutting tool 2 is perpendicular to the platform 3. A positioning mechanism 4 for fixing the film 1 during cutting is arranged on the platform 3. The positioning mechanism 4 comprises two groups of rollers for clamping the film 1. One group of rollers is a movable roller 41 located at the front end of the film 1 transmission path, and the other group of rollers is a fixed roller 42 located at the rear end of the film 1 transmission path. The movable roller 41 can The platform 3 is able to move relative to the fixed roller 42 along the transmission direction of the film 1. A linear driver for driving the movable roller 41 to move is provided on the platform 3. The cutting tool 2 can move with the movable roller 41. The distance between the movable roller 41 and the fixed roller 42 is the width of the film 1 to be cut. An anti-deviation structure 5 is provided directly above the platform 3 and between the movable roller 41 and the fixed roller 42 for cooperating with the cutting tool 2 to further fix the film 1. When the cutting tool 2 cuts the film 1, the anti-deviation structure 5 is in close contact with the film 1, so that the film 1 does not shrink during the cutting process.

[0021] Before cutting the film 1, preparation work is performed to calibrate the position of the cutting tool 2. That is, the distance between the movable roller 41 and the fixed roller 42 is adjusted by the linear drive. The movable roller 41 moves freely relative to the fixed roller 42 along the transmission direction of the film 1. The position of the movable roller 41 is adjusted according to the real-time sensor feedback to ensure that the distance between it and the fixed roller 42 is always equal to the required cutting width of the film 1. Ensure that the required cutting width of the film 1 is met.

[0022] After the preparation work is completed, the operator manually guides the film 1 to be cut from the transmission mechanism to the platform 3. At this time, the film 1 passes through the movable roller 41, and the transmission mechanism starts to drive the film 1 to move at a constant speed along the set path. During the transmission of the film 1, the movable roller 41 always rolls close to the surface of the film 1, playing a continuous clamping role to prevent the film 1 from deviating. Since the movable roller 41 can move freely along the transmission direction of the film 1 relative to the fixed roller 42, it can meet the cutting needs of films 1 of different lengths and shapes and achieve precise positioning.

[0023] Next, when the film 1 is transferred to the designated position, the film 1 enters the fixed roller 42, and the film 1 to be cut is clamped between the fixed roller 42 and the movable roller 41. The cutting tool 2 quickly descends and cuts into the film 1. Before cutting, the cutting tool 2 moves relative to the fixed roller 42 along with the movable roller 41, so that the cutting tool 2 can cut the film 1 at the designated position. Therefore, after cutting, the film 1 is ensured to be cut into a suitable width.

[0024] During the cutting action of the cutting tool 2, the anti-deviation structure 5 located between the movable roller 41 and the fixed roller 42 begins to play a role. When the cutting tool 2 contacts the film 1, the anti-deviation structure 5 will respond immediately, applying appropriate pressure downward to the film 1 to make itself fit tightly with the film 1. On the basis of the clamping of the film 1 by the movable roller 41 and the fixed roller 42, the stability of the film 1 in the cutting area is further enhanced to prevent the film 1 from shrinking due to the cutting force. Since there is a linkage relationship between the anti-deviation structure 5 and the cutting tool 2, during the cutting process, the two always maintain a highly consistent action rhythm, jointly ensuring the perfect presentation of the cutting effect.

[0025] After the cutting is completed, the cutting blade 2 is quickly reset, and the transmission mechanism continues to drive the remaining part of the film 1 forward to prepare for the next round of cutting tasks. During the transmission process, the movable roller 41 maintains effective clamping of the film 1 until the entire film 1 is completely cut. Finally, the film 1 sheets cut into specific sizes will be neatly stacked together and wait for subsequent processing.

[0026] See also Figure 3-Figure 6 As shown, the movable roller 41 and the fixed roller 42 are both composed of two upper and lower parallel rotating rollers 411, the top surface of the rotating roller 411 located at the bottom is flush with the upper surface of the platform 3, and the rotating roller 411 located at the top can move vertically relative to the rotating roller 411 below, and the platform 3 is provided with a first vertical guide rail 31 for sliding connection of the two ends of the rotating roller 411 of the fixed roller 42 and a second vertical guide rail 32 for sliding connection of the two ends of the rotating roller 411 of the movable roller 41, the first vertical guide rail 31 is fixedly connected to the platform 3, the linear drive has a transverse guide rail 33 for sliding connection of the second vertical guide rail 32, and the first vertical guide rail 31 and the second vertical guide rail 32 are both provided with a downward drive for driving the rotating roller 411 to move.

[0027] The pressing drive is not shown in the figure. A clamping gap for the film 1 to pass through is left between each two corresponding rotating rollers 411 , and the pressing drive is used to adjust the clamping gap between the two rotating rollers 411 .

[0028] Each rotary drum 411 has a rotary drive for driving the rotary drum 411 to rotate, which is not shown in the figure. The rotation directions of each two corresponding rotary drums 411 are opposite, and the two rotary drums 411 performing opposite rotational motions have a conveying effect on the film 1.

[0029] When the film 1 is conveyed, the fixed roller 42 and the movable roller 41 clamp the film 1 together through the upper and lower parallel rotating rollers 411. The lower rotating roller 411 is flush with the top surface of the platform 3 to ensure a smooth transition of the film 1, while the upper rotating roller 411 can move vertically to adjust the clamping gap. By pressing down the driver, the clamping gap between the corresponding rotating rollers 411 is adjusted along the direction of the first vertical guide rail 31 and the second vertical guide rail 32, and the film 1 is clamped stably and appropriately according to its thickness to prevent the film 1 from being clamped loosely or excessively to cause wrinkles.

[0030] See also Figure 3-Figure 10 As shown, the cutting tool 2 has a tool holder 21 arranged between a pair of second vertical guide rails 32 and a tool head 22 connected to the lower end of the tool holder 21, each second vertical guide rail 32 is provided with a cylinder 23 for driving the tool holder 21 to move vertically, and the anti-deviation structure 5 has an extrusion member 51 that can be in close contact with the film 1 and a trigger member 52 arranged on the tool holder 21 and cooperating with the extrusion member 51. When the tool holder 21 moves downward, the extrusion member 51 is in a synchronous downward pressure state driven by the trigger member 52.

[0031] When the tool holder 21 of the cutting tool 2 moves downward along the second vertical guide rail 32 driven by the cylinder 23, the tool head 22 gradually approaches the film 1. At the same time, the trigger member 52 arranged on the tool holder 21 synchronously drives the extrusion member 51 in the anti-deviation structure 5 to be pressed down, ensuring that the extrusion member 51 is in close contact with the film 1.

[0032] During this process, the extruder 51 always keeps the same movement as the cutter head 22 under the action of the trigger member 52, applies appropriate pressure to the film 1, and prevents the film 1 from deflecting or shrinking during the cutting process, thereby ensuring the precise and perfect cutting effect.

[0033] The whole process realizes the synchronous action of the cutting tool 2 and the anti-deviation structure 5 through the coordinated work of the cylinder 23 and the trigger member 52, thereby ensuring the stability and high quality of the cutting of the film 1.

[0034] See also Figure 3-Figure 5 and Figure 7-Figure 9As shown, a vertically movable cross bar 53 is provided between a pair of first vertical guide rails 31 and between a pair of second vertical guide rails 32, each of the first vertical guide rail 31 and the second vertical guide rail 32 has a sliding portion 54 for sliding connection with the corresponding cross bar 53, a spring 541 is connected between the sliding portion 54 and the corresponding cross bar 53, and each cross bar 53 is provided with an extrusion member 51 near its two ends, and when the extrusion member 51 applies pressure on the film 1, the spring 541 is in a stretched state.

[0035] When the cutting device is started, the cylinder 23 drives the knife holder 21 to move downward along the second vertical guide rail 32, and the cross bar 53 also moves downward synchronously. As the cross bar 53 moves downward, the extrusion members 51 at both ends gradually approach the film 1 and finally apply pressure. At this time, the spring 541 is stretched, which is conducive to the reset of the extrusion member 51 after the film 1 is cut.

[0036] As the trigger 52 presses down the crossbar 53, since each crossbar 53 is provided with a pressing piece 51 near both ends thereof, these pressing pieces 51 act on the four corners of the film 1 respectively. When the crossbar 53 moves down to its proper position, the four pressing pieces 51 simultaneously press on the four corners of the film 1, so that each corner of the film 1 can be subjected to a uniform and stable pressing force. This not only prevents the film 1 from deflecting or shrinking during the cutting process, but also ensures the flatness of the cutting edge.

[0037] See also Figure 3 , Figure 7 , Fig. 9 and Fig.10 As shown, the trigger member 52 is specifically a rod structure extending from the tool holder 21 toward the tail end of the film 1 transmission path, and the bottom of the trigger member 52 has a flexible pad layer 521 that can contact all the cross bars 53. When the knife head 22 cuts the film 1, the trigger member 52 is in a state of continuous pressure on all the cross bars 53 under the action of the flexible pad layer 521, so that the four corners of the cut film 1 are fixed by the extrusion member 51.

[0038] Since a flexible cushion layer 521 is provided at the bottom of the trigger member 52 , when the cutter head 22 cuts the film 1 , the flexible cushion layer 521 can keep all the cross bars 53 in continuous contact with the film 1 and apply pressure.

[0039] As the crossbar 53 moves downward, the extrusion members 51 at both ends thereof continue to apply pressure to the film 1 and apply pressure to multiple points of the film 1. The extrusion members 51 on the crossbar 53 always firmly fix the film 1 during the entire cutting process, ensuring the efficiency and accuracy of the cutting process.

[0040] See also Figure 3 , Figure 7 , Fig. 9 and Fig.10 As shown, each cross bar 53 has a guide shaft 531 extending upward through the corresponding sliding part 54 , and the sliding part 54 is provided with a guide opening for the guide shaft 531 to pass through. The extrusion piece 51 is specifically a buffer pad structure connected to the lower end of the guide shaft 531 .

[0041] As the crossbar 53 moves downward, the guide shaft 531 slides smoothly in the guide opening to ensure that the vertical movement of the crossbar 53 maintains linearity and stability. At the same time, the cushion structure connected to the lower end of the guide shaft 531, that is, the extrusion member 51 gradually approaches the film 1 and finally applies pressure.

[0042] When the crossbar 53 reaches the predetermined position, the cushion structure contacts the film 1 and applies pressure to the film 1 evenly and stably through its own flexibility and elasticity, so that the film 1 always remains stable during the cutting process and avoids shrinkage and deviation.

[0043] See also Figure 3-Figure 5 and Figure 7-Figure 9 As shown, an airbag 532 wrapping the extrusion member 51 is connected between every two guide shafts 531 located on the same side of the platform 3, and the guide shaft 531 has an air channel 5311 connected with the airbag 532 through the extrusion member 51. When the extrusion member 51 squeezes the film 1 onto the platform 3, the airbag 532 is ventilated and expanded, so that the film 1 is further fixed on the platform 3.

[0044] When the extruder 51 indirectly presses the film 1 onto the platform 3 through the airbag 532, the air channel 5311 is activated, so that the airbag 532 begins to ventilate and expand. After the airbag 532 expands, it presses the film 1 tightly, further enhancing the fixing effect on the film 1.

[0045] The airbag 532 can provide a relatively uniform pressure distribution during the expansion process, ensuring that the pressure on each part of the film 1 is consistent. Covering a larger area not only increases the contact area with the film 1, but also enhances the overall fixing effect. The double fixing mechanism not only improves the stability of the film 1, but also ensures the flatness and accuracy of the cutting edge.

[0046] When the movable roller 41 is adjusted relative to the fixed roller 42 , the airbag 532 has good flexibility and elasticity, so it can automatically adjust its shape to adapt to the new position and pressure distribution when the distance between the movable roller 41 and the fixed roller 42 changes.

[0047] See also Figure 3 and Fig.10As shown, two trigger members 52 are symmetrically arranged on the tool holder 21, and each trigger member 52 has a nozzle 522 along its length direction for ventilating and smoothing the film 1. The direction of the airflow ejected from the nozzle 522 is inclined from the inside to the outside on the upper surface of the platform 3. The two trigger members 52 can move synchronously and oppositely along the edge direction on the tool holder 21. A sliding frame 211 connected to the trigger member 52 and a bidirectional driver for driving the two sliding frames 211 to move are slidably provided on the tool holder 21.

[0048] The bidirectional driver is not shown in the figure.

[0049] When the knife holder 21 descends and approaches the film 1, the bidirectional drive starts to work, pushing the two slides 211 to move synchronously and oppositely along the edge of the knife holder 21. At the same time, the nozzle 522 on the trigger member 52 starts to spray air, and the airflow blows obliquely from the inside to the outside toward the upper surface of the platform 3, effectively smoothing the film 1 and removing any wrinkles that may exist. This not only ensures that the film 1 is in a flat state before cutting, but also provides a good foundation for subsequent fixing and cutting operations.

[0050] During the whole process, the bidirectional drive accurately controls the moving speed and position of the two sliding frames 211 to ensure that the airflow can act evenly and consistently on the film 1, so that the film 1 always maintains the best flatness and stability on the platform 3, thereby ensuring the accuracy and flatness of the cutting edge.

[0051] See also Figure 4 , Figure 8 and Fig. 9 As shown, side guide rails 34 capable of contacting the edge of the film 1 are provided on both sides of the platform 3 along the direction of film 1 transmission, the side guide rails 34 have guide grooves for limiting the edge of the film 1, the front end of the side guide rails 34 has guide edges 341 for guiding the film 1 into the guide grooves, and the bottom of the side guide rails 34 has a plurality of negative pressure ports 342 along the length direction thereof for adsorbing the film 1 from the lower surface.

[0052] When the film 1 starts to be transported, the guide edge 341 first guides the film 1 into the guide groove of the side guide rail 34. As the film 1 continues to move forward, the negative pressure port 342 is activated and generates suction, which tightly adsorbs the film 1 to the bottom of the side guide rail 34, ensuring that the edge of the film 1 is always in the guide groove.

[0053] The negative pressure port 342 absorbs the film 1 from the lower surface to further fix its position, thereby preventing the film 1 from deflecting or shaking during the transmission or cutting process, thereby providing a reliable guarantee for the cutting step.

[0054] A gravure printing machine comprises a printing plate cylinder, an ink tank, a scraper and an impression cylinder, and also comprises a multi-axis linkage self-positioning film cutting device.

[0055] When the gravure printing machine starts working, the plate cylinder takes a proper amount of ink from the ink tank, and the ink fills the concave part of the plate cylinder surface. Then, the scraper is close to the surface of the plate cylinder to scrape off the excess ink, ensuring that only the concave part retains the ink.

[0056] Next, the plate cylinder and the impression cylinder work together. When the film 1 passes between the plate cylinder and the impression cylinder, the impression cylinder applies pressure to transfer the ink on the plate cylinder to the film 1, completing the printing process.

[0057] The printed film 1 is dried and cooled to ensure that the ink is completely dry. The printed and dried film 1 enters the multi-axis linkage self-positioning cutting device. The cutting position is automatically adjusted according to the preset parameters. The self-positioning function ensures high-precision cutting even at high speed. The finished product after cutting is sent out for subsequent processing.

[0058] In the present invention, the fixed roller 42 and the movable roller 41 work together to clamp the film 1, thereby ensuring that the film 1 remains stable and flat throughout the entire cutting area to prevent deviation.

[0059] During the cutting process and before the airbag 532 is inflated, the nozzle 522 on the trigger member 52 ejects an inclined airflow to smooth the film 1 and remove wrinkles. The bidirectional driver accurately controls the moving speed and position of the sliding frame 211 to ensure that the airflow acts evenly on the film 1 to maintain optimal flatness on the platform 3.

[0060] Then, the trigger member 52 simultaneously presses down all the crossbars 53 while following the movement of the cutting tool 2, so that all the extrusion members 51 are in close contact with the film 1, and the pressing force is applied evenly and stably. The airbag 532 then expands and presses tightly against the film 1, providing uniform pressure distribution, increasing the contact area, and further enhancing the fixing effect.

[0061] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A multi-axis linkage self-positioning film cutting device, comprising a frame, a transmission mechanism arranged on the frame, and a cutting tool (2), wherein a platform (3) for placing the film (1) during cutting is arranged on the frame and below the cutting tool (2), and the cutting direction of the cutting tool (2) is perpendicular to the platform (3); characterized in that: The platform (3) is provided with a positioning mechanism (4) for fixing the film (1) during the cutting process. The positioning mechanism (4) includes two groups of rollers for clamping the film (1), one group of rollers is a movable roller (41) located at the front end of the film (1) transmission path, and the other group of rollers is a fixed roller (42) located at the rear end of the film (1) transmission path; the movable roller (41) can move relative to the fixed roller (42) along the film (1) transmission direction, and the platform (3) is provided with a linear drive for driving the movable roller (41) to move. The cutting knife The tool (2) is capable of following the movement of the movable roller (41), and the distance between the movable roller (41) and the fixed roller (42) is the width of the film (1) to be cut; an anti-deviating structure (5) is provided directly above the platform (3) and between the movable roller (41) and the fixed roller (42) for cooperating with the cutting tool (2) to further fix the film (1); when the cutting tool (2) is cutting the film (1), the anti-deviating structure (5) is in close contact with the film (1), so that the film (1) does not shrink inward during the cutting process.

2. The multi-axis linkage self-positioning film cutting device according to claim 1, characterized in that: The movable roller (41) and the fixed roller (42) are both composed of two rotating rollers (411) parallel to each other in the upper and lower directions. The top surface of the rotating roller (411) located at the lower side is flush with the upper surface of the platform (3). The rotating roller (411) located at the upper side can move vertically relative to the rotating roller (411) located at the lower side. The platform (3) is provided with a first vertical guide rail (31) for sliding connection of the two ends of the rotating roller (411) of the fixed roller (42) and a second vertical guide rail (32) for sliding connection of the two ends of the rotating roller (411) of the movable roller (41). The first vertical guide rail (31) is fixedly connected to the platform (3). The linear drive has a transverse guide rail (33) for sliding connection of the second vertical guide rail (32). The first vertical guide rail (31) and the second vertical guide rail (32) are both provided with a downward drive for driving the rotating roller (411) to move.

3. The multi-axis linkage self-positioning film cutting device according to claim 2, characterized in that: The cutting tool (2) comprises a tool holder (21) arranged between a pair of second vertical guide rails (32) and a tool head (22) connected to the lower end of the tool holder (21). Each second vertical guide rail (32) is provided with a cylinder (23) for driving the tool holder (21) to move vertically. The anti-deviating structure (5) comprises an extrusion member (51) capable of closely contacting the film (1) and a trigger member (52) arranged on the tool holder (21) and cooperating with the extrusion member (51). When the tool holder (21) moves downward, the extrusion member (51) is in a synchronous downward pressing state driven by the trigger member (52).

4. The multi-axis linkage self-positioning film cutting device according to claim 3, characterized in that: A vertically movable cross bar (53) is provided between the pair of first vertical guide rails (31) and between the pair of second vertical guide rails (32); each of the first vertical guide rail (31) and the second vertical guide rail (32) has a sliding portion (54) for sliding connection with the corresponding cross bar (53); a spring (541) is connected between the sliding portion (54) and the corresponding cross bar (53); each cross bar (53) is provided with an extrusion member (51) near both ends thereof; when the extrusion member (51) exerts pressure on the film (1), the spring (541) is in a stretched state.

5. The multi-axis linkage self-positioning film cutting device according to claim 4, characterized in that: The trigger member (52) is specifically a rod structure extending from the knife holder (21) toward the rear end of the film (1) transmission path, and the bottom of the trigger member (52) has a flexible cushion layer (521) capable of contacting all cross bars (53). When the knife head (22) performs a cutting action on the film (1), the trigger member (52) is in a state of continuously applying pressure to all cross bars (53) under the action of the flexible cushion layer (521), so that the four corners of the cut film (1) are fixed by the extrusion member (51).

6. The multi-axis linkage self-positioning film cutting device according to claim 5, characterized in that: Each crossbar (53) has a guide shaft (531) extending upward through a corresponding sliding portion (54), the sliding portion (54) is provided with a guide opening for the guide shaft (531) to pass through, and the extrusion member (51) is specifically a buffer pad structure connected to the lower end of the guide shaft (531).

7. The multi-axis linkage self-positioning film cutting device according to claim 6, characterized in that: An airbag (532) is connected between each two guide shafts (531) located on the same side of the platform (3) and wraps the extrusion member (51) therein; the guide shaft (531) has an air passage (5311) connected to the airbag (532) through the extrusion member (51); when the extrusion member (51) presses the film (1) onto the platform (3), the airbag (532) is ventilated and expanded, so that the film (1) is further fixed on the platform (3).

8. The multi-axis linkage self-positioning film cutting device according to claim 5, characterized in that: Two trigger members (52) are symmetrically arranged on the tool holder (21), and each trigger member (52) has a nozzle (522) along its length direction for ventilating and smoothing the film (1). The direction of the airflow ejected from the nozzle (522) is inclined from the inside to the outside on the upper surface of the platform (3). The two trigger members (52) can move synchronously and in opposite directions along the edge direction of the tool holder (21). A sliding frame (211) connected to the trigger member (52) and a bidirectional driver for driving the two sliding frames (211) to move are slidably arranged on the tool holder (21).

9. The multi-axis linkage self-positioning film cutting device according to claim 2, characterized in that: Side guide rails (34) capable of contacting the edge of the film (1) are provided on both sides of the platform (3) along the direction in which the film (1) is transported. The side guide rails (34) have guide grooves for limiting the edge of the film (1). The front end of the side guide rails (34) has guide edges (341) for guiding the film (1) into the guide grooves. The bottom of the side guide rails (34) has a plurality of negative pressure ports (342) along the length direction thereof for adsorbing the film (1) from the lower surface.

10. A gravure printing machine, comprising a plate cylinder, an ink tank, a scraper and an impression cylinder, characterized in that: It also includes a multi-axis linkage self-positioning film cutting device as described in any one of claims 1-9.

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