flying knife mechanism of bag making machine

Abstract

This application discloses a flying knife mechanism for a bag-making machine, including a frame, a front clamping device and a rear clamping device disposed opposite to each other within the frame, and a flying knife device that reciprocates between the front clamping device and the rear clamping device. The flying knife device includes a drive device fixed to the frame and a knife holder connected to the drive device. Blade grooves are machined on the bottom sides of the knife holder near the front and rear clamping devices, and blades are mounted on them via blade pressure plates. Positioning pins corresponding to the blades protrude from the blade grooves. Each blade includes a cutting edge, a blade body, and a spare edge arranged sequentially. The blade body has oblong holes at both ends corresponding to the positioning pins, and the two sides of the blade body slide against the sidewalls of the blade grooves. This flying knife mechanism for the bag-making machine has a simple structure, and the blades are adjustablely mounted on the knife holder, facilitating blade position adjustment.

Description

Technical Field

[0001] This application relates to the field of automated production technology, and in particular to a flying knife mechanism for a bag making machine. Background Technology

[0002] In existing plastic bag making machines, plastic bags are typically manufactured by heat-sealing and cutting plastic film using a heater and a cutting mechanism. When manufacturing plastic bags with curved edges, the plastic film is fed intermittently along its length. When the plastic film stops, the blade moves towards the plastic film and support table, cutting the plastic film on the support table to create the plastic bag. Currently, the blades in the flying knife structure are generally completely fixed to the blade holder, and the blade position is adjusted by changing the mounting position of the blade holder. However, adjusting the blade holder requires removing and installing 8-12 bolts, and there is no reference point for blade holder adjustment, making the adjustment time-consuming and labor-intensive. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide a flying knife mechanism for a bag-making machine to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a flying knife mechanism for a bag-making machine, including a frame, a front clamping device and a rear clamping device arranged opposite to each other within the frame, and a flying knife device that reciprocates between the front clamping device and the rear clamping device. The flying knife device includes a drive device fixed to the frame and a knife holder connected to the drive device. The bottom ends of the knife holder near the front clamping device and the rear clamping device are respectively machined with blade grooves, and blades are respectively mounted on the blade holders via blade pressure plates. Positioning pins corresponding to the blades protrude from the blade grooves. The blades include a cutting edge, a blade body, and a spare edge arranged in sequence. The blade body has waist-shaped holes at both ends that correspond to the positioning pins, and the two sides of the blade body slide against the sidewalls of the blade grooves.

[0005] Furthermore, in the flying knife mechanism of the bag making machine described above, the thickness of the blade is greater than the depth of the blade groove, and the blade pressure plate is provided with a clearance hole corresponding to the positioning pin.

[0006] Furthermore, in the flying knife mechanism of the bag making machine described above, the frame includes a horizontally arranged base plate, a front wall plate and a rear wall plate arranged at the top of the base plate, and the front wall plate and the rear wall plate are arranged opposite to each other and spaced apart along the traveling direction of the film material of the bag making machine.

[0007] Furthermore, in the flying knife mechanism of the bag making machine described above, the front clamping device includes a front upper pressure plate and a front lower pressure plate arranged opposite to each other. The front upper pressure plate is mounted on the front wall plate by a front cylinder, and the front lower pressure plate is fixed to the front wall plate by a front seat plate.

[0008] Furthermore, in the flying knife mechanism of the bag making machine described above, the front cylinder is mounted on the inner wall of the front wall plate via a cylinder seat, the front wall plate is provided with a front clearance groove corresponding to the front cylinder, the piston rod of the front cylinder is connected to the front upper pressure plate via a front spherical joint, and the front upper pressure plate is slidably connected to the front wall plate via a front guide rail.

[0009] Furthermore, in the flying knife mechanism of the bag making machine described above, the bottom surface of the upper front pressure plate is machined with a front mounting groove, and a front silicone strip is embedded in the front mounting groove and sealed with Teflon tape.

[0010] Furthermore, in the flying knife mechanism of the bag making machine described above, the rear clamping device includes a rear upper pressure plate and a rear lower pressure plate arranged opposite to each other. The rear upper pressure plate is connected to a fixed plate through a rear cylinder. The two ends of the fixed plate are respectively connected to the front wall plate and the rear wall plate through upper support plates. The two ends of the rear lower pressure plate are respectively connected to the bottom plate, the front wall plate and the rear wall plate through lower support plates.

[0011] Furthermore, in the flying knife mechanism of the bag making machine described above, the rear cylinder is mounted on the side wall of the fixed plate via a cylinder seat. The fixed plate is provided with a rear clearance groove corresponding to the rear cylinder. The piston rod of the rear cylinder is connected to the rear upper pressure plate via a rear spherical joint. The rear upper pressure plate is slidably connected to the fixed plate via a rear guide rail.

[0012] Furthermore, in the flying knife mechanism of the bag making machine described above, the bottom surface of the upper rear pressure plate is machined with a rear mounting groove, and a rear silicone strip is embedded in the rear mounting groove and sealed with Teflon tape.

[0013] Furthermore, in the flying knife mechanism of the bag making machine described above, the front wall plate is provided with a feed inlet and a waste outlet, the side of the fixed plate is provided with a waste trough extending to the waste outlet, the rear wall plate is provided with a discharge outlet, and the top of the discharge outlet is flush with the top of the rear clearance groove.

[0014] Compared with the prior art, the flying knife mechanism of the bag making machine of this utility model has a simple structure. The blade can be adjusted and installed on the blade holder, which makes it easy to adjust the position of the blade. The sides of the front cylinder and the rear cylinder are unobstructed, which makes it easy to adjust the stroke and speed. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The diagram shown is a structural schematic of the flying knife mechanism of a bag-making machine in a specific embodiment of this utility model.

[0016] Figure 2 The diagram shown is a schematic diagram of the installation of the rear wall panel in a specific embodiment of this utility model.

[0017] Figure 3 The diagram shown is an exploded view of the blade, blade pressure plate, and blade holder in a specific embodiment of this utility model.

[0018] Figure 4 The diagram shown is a structural schematic of the front clamping device and the rear clamping device in a specific embodiment of this utility model.

[0019] Figure 5 The diagram shown is a schematic representation of the positions of the flying knife device, the front clamping device, and the rear clamping device in a specific embodiment of this utility model.

[0020] Figure 6 The diagram shown is a structural schematic of the cylinder seat in a specific embodiment of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Combination Figures 1 to 6 As shown, a flying knife mechanism for a bag-making machine includes a frame 1, a front clamping device 2 and a rear clamping device 3 disposed opposite to each other within the frame 1, and a flying knife device 4 that reciprocates between the front clamping device 2 and the rear clamping device 3. The flying knife device 4 includes a drive device 41 fixed to the frame 1 and a knife holder 42 connected to the drive device 41. The knife holder 42 has blade grooves 421 machined on its bottom sides near the front clamping device 2 and the rear clamping device 3, and blades 44 are respectively mounted on the blade holder 42 by blade pressure plates 43. A positioning pin 422 corresponding to the blade protrudes from the blade groove 421. The blade 44 includes a cutting blade 441, a blade body 442 and a spare blade 443 arranged in sequence. The blade body 442 has waist-shaped holes at both ends that correspond to the positioning pins 422, and the two sides of the blade body 442 slide against the sidewalls of the blade groove 421.

[0023] In this technical solution, the frame is slidably mounted on a conventional base, which is fixed to the bag-making machine line by bolts. The frame's base plate has oblong holes machined into it and is connected to the base by locking bolts. To adjust the position of the flying knife mechanism on the bag-making machine, the locking bolts are loosened, and the adjusting screw is rotated using a conventional handwheel, thereby adjusting the position of the flying knife mechanism via the adjusting seat. After adjustment, the locking bolts are tightened. The adjusting seat is fixed to the frame's base plate by bolts, and it has threads corresponding to the adjusting screw. The finished film / packaging bag is conveyed into the bag-making machine from the side where the first pressing device is located. After reaching the set position, the front and rear pressing devices press the finished film / packaging bag to ensure sufficient tension for smooth cutting. The drive device drives the blade on the cutter head to move linearly. After cutting, the cutter head does not need to be reset, and the front and rear pressing devices reset. The finished film / packaging bag on the side where the rear pressing device is located is removed by an external material handling device or manually. The finished film / packaging bag from the subsequent bag-making machine... After continuing to the set position, the front and rear clamping devices clamp the film / packaging bag finished product of the bag making machine again. The drive device drives the blade assembly on the cutter head to move in the opposite direction (compared to the previous cutting direction) and complete the cut. That is, the cutting function can be completed during the reciprocating movement of the cutter head. The drive device uses a conventional servo linear module. The cutter head is connected to the slide of the drive device by bolts, etc., to improve the accuracy and stability of the cutter head movement. Both the cutting blade and the spare blade are two-blade structures, and the cutting function can be completed during the reciprocating movement of the blades. Similar to the spare blade structure, rotating the blade 180° allows the cutting blade and spare blade to be interchanged. The bottom of the blade groove is open, and the top is parallel to the cutting blade or spare blade. When installing the blade, fit the corresponding waist-shaped hole (the waist-shaped hole closest to the spare blade when using the cutting blade) onto the positioning pin, and install the blade pressure plate onto the blade holder with screws. Adjust the up and down position of the blade. After the blade position is adjusted, lock the blade pressure plate with screws. The two sides of the blade abut against the side wall of the blade groove. Only the up and down position of the blade needs to be adjusted, which is convenient for adjustment.

[0024] For example, see Figures 1 to 6 As shown, the thickness of the blade 44 is greater than the depth of the blade groove 421, and the blade pressure plate 43 is provided with a clearance hole 431 corresponding to the positioning pin 422.

[0025] In this technical solution, when installing the blade pressure plate, the positioning pin is inserted into the clearance hole to avoid interfering with the installation of the blade pressure plate. After the blade pressure plate is tightened by screws, its inner side (the side closest to the blade) abuts against the surface of the blade and fixes the blade. The blade holder is machined with three threaded holes on each side of the blade groove. Each blade pressure plate has two tapered countersunk holes on one side and one tapered countersunk hole on the other side. The mounting screws of the two blade pressure plates are staggered. The thickness of the blade is greater than the depth of the blade groove, that is, the outer side of the blade (the side closest to the blade pressure plate) protrudes from the blade holder. After the pressure plate is tightened by screws, the blade is pressed and fixed.

[0026] For example, see Figure 1 and Figure 2 As shown, the frame 1 includes a horizontally arranged base plate 11, a front wall plate 12 and a rear wall plate 13 disposed at the top of the base plate 11, and the front wall plate 12 and the rear wall plate 13 are arranged opposite to each other and spaced apart along the traveling direction of the film material of the bag making machine.

[0027] In this technical solution, the front wall panel and the rear wall panel are fixed to the top surface of the base plate by conventional bolts, etc., for mounting the flying knife device, the front clamping device and the rear clamping device.

[0028] For example, see Figure 1 and Figure 2 As shown, the front clamping device 2 includes a front upper pressure plate 21 and a front lower pressure plate 22 arranged opposite to each other. The front upper pressure plate 21 is set on the front wall plate 12 by a front cylinder 24, and the front lower pressure plate 22 is fixed to the front wall plate 12 by a front seat plate 23.

[0029] In this technical solution, a conventional telescopic cylinder can be used for the front cylinder, and a magnetic switch is set on its surface to control the piston stroke. The piston rod of the front cylinder drives the front upper pressure plate to rise and fall.

[0030] For example, see Figure 1 as well as Figures 3 to 6 As shown, the front cylinder 24 is mounted on the inner wall of the front wall panel 12 via the cylinder seat 25. The front wall panel 12 is provided with a front clearance groove 121 corresponding to the front cylinder 24. The piston rod of the front cylinder 24 is connected to the front upper pressure plate 21 via the front spherical joint 26. The front upper pressure plate 21 is slidably connected to the front wall panel 12 via the front guide rail 27.

[0031] In this technical solution, the cylinder seat is a block structure, connected to the top of the front cylinder (the end opposite to the piston rod) by conventional bolts. Mounting ears protrude from both sides and are mounted to the inner wall of the front wall panel (the side wall near the flying knife device) by conventional bolts, thus mounting the front cylinder to the front wall panel. The front wall panel has a corresponding clearance groove for the front cylinder, exposing the corresponding side of the front cylinder, facilitating the installation and adjustment of the front cylinder regulating valve and magnetic switch, thereby adjusting the stroke and speed of the front cylinder without disassembling the frame, simplifying operation. The upper front pressure plate is slidably connected to the front wall panel via a front guide rail, improving its sliding accuracy and stability. The fisheye connector is an existing structure, with one end connected to the piston rod of the front cylinder via a threaded connection, and the other end rotatably connected to the upper front pressure plate via a pin, reducing the possibility of radial force on the piston rod and protecting the front cylinder.

[0032] For example, see Figures 3 to 6 As shown, the bottom surface of the front upper pressure plate 21 is machined with a front mounting groove, and a front silicone strip 28 is embedded in the front mounting groove and sealed with Teflon tape (not shown).

[0033] In this technical solution, the bottom surface of the upper front pressure plate (near the end face of the lower front pressure plate) is machined with a through groove, which serves as the mounting groove for the front silicone strip. After the top of the front silicone strip is embedded in the mounting groove, it is sealed and fixed to the upper front pressure plate with Teflon tape to prevent it from falling off. When it needs to be replaced, the Teflon tape is peeled off and the front silicone strip is pulled out from the mounting groove. The front silicone strip is soft and protrudes from the bottom surface of the upper front pressure plate. The front silicone strip presses the film material / packaging bag of the bag making machine tightly, avoiding damage to the surface of the film material / packaging bag of the bag making machine.

[0034] For example, see Figures 3 to 6 As shown, the rear clamping device 3 includes a rear upper pressure plate 31 and a rear lower pressure plate 32 arranged opposite to each other. The rear upper pressure plate 31 is connected to the fixed plate 34 through the rear cylinder 33. The two ends of the fixed plate 34 are connected to the front wall plate 12 and the rear wall plate 13 through the upper support plate 14, respectively. The two ends of the rear lower pressure plate 32 are connected to the bottom plate 11, the front wall plate 12 and the rear wall plate 13 through the lower support plate 15, respectively.

[0035] In this technical solution, to ensure the distance between the rear clamping device and the front clamping device, the rear clamping device is set between the front wall panel and the rear wall panel by a fixing plate. The fixing plate, the upper support plate and the lower support plate are all conventional plate structures and are spliced ​​by conventional bolts and pins. The upper support plate and the lower support plate are spaced apart. The blade can be replaced and adjusted without disassembling the frame, which is convenient for operation.

[0036] For example, see Figures 3 to 6As shown, the rear cylinder 33 is placed on the side wall of the fixed plate 34 via the cylinder seat 35. The fixed plate 34 is provided with a rear clearance groove corresponding to the rear cylinder 33. The piston rod of the rear cylinder 33 is connected to the rear upper pressure plate 31 via the rear spherical joint 36. The rear upper pressure plate 31 is slidably connected to the fixed plate 34 via the rear guide rail 37.

[0037] In this technical solution, the installation structure of the rear cylinder and its connection structure with the rear upper pressure plate are the same as the installation structure of the front cylinder and the connection structure between the front cylinder and the front upper pressure plate. The corresponding side of the rear cylinder is exposed, which facilitates the installation and adjustment of the rear cylinder regulating valve and magnetic switch, thereby adjusting the stroke and speed of the rear cylinder without disassembling the frame, making operation convenient.

[0038] For example, see Figures 3 to 6 As shown, the bottom surface of the rear upper pressure plate 31 is machined with a rear mounting groove, and a rear silicone strip 38 is embedded in the rear mounting groove and sealed with Teflon tape.

[0039] In this technical solution, the installation structure of the rear silicone strip is the same as that of the front silicone strip.

[0040] For example, see Figure 1 and Figure 2 As shown, the front wall panel 12 is provided with a feed inlet and a waste outlet, the side of the fixing plate 34 is provided with a waste trough extending to the waste outlet, and the rear wall panel 13 is provided with a discharge outlet, the top of the discharge outlet being flush with the top of the rear clearance groove.

[0041] In this technical solution, a support plate is provided on the outside of the feed inlet to support the film material / packaging bag finished product of the bag making machine. The film material / packaging bag finished product of the bag making machine enters the machine frame through the feed inlet and moves to the outside of the machine frame through the discharge outlet. The waste generated by cutting falls between the front pressing device and the rear pressing device and is discharged to the outside of the waste outlet through the waste trough. The top of the discharge outlet is flush with the top of the rear clearance groove, that is, the rear wall panel does not block the corresponding side of the rear cylinder.

[0042] In summary, the flying knife mechanism of this bag making machine has a simple structure. The blades are adjustable and mounted on the blade holder, making it easy to adjust the position of the blades. The sides of both the front and rear cylinders are unobstructed, making it easy to adjust the stroke and speed.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A flying knife mechanism for a bag-making machine, characterized in that, The device includes a frame, a front clamping device and a rear clamping device disposed opposite to each other within the frame, and a flying knife device that reciprocates between the front clamping device and the rear clamping device. The flying knife device includes a drive device fixed to the frame and a knife holder connected to the drive device. The knife holder has blade grooves machined on its bottom sides near the front clamping device and the rear clamping device, and blades are mounted on them by blade pressure plates. Positioning pins corresponding to the blades protrude from the blade grooves. The blades include a cutting edge, a blade body and a spare edge arranged in sequence. The blade body has waist-shaped holes at both ends that correspond to the positioning pins. The two sides of the blade body slide against the sidewalls of the blade grooves.

2. The flying knife mechanism of the bag-making machine according to claim 1, characterized in that: The thickness of the blade is greater than the depth of the blade groove, and the blade pressure plate is provided with a clearance hole corresponding to the positioning pin.

3. The flying knife mechanism of the bag-making machine according to claim 1, characterized in that: The frame includes a horizontally arranged base plate, a front wall plate and a rear wall plate disposed at the top of the base plate, and the front wall plate and the rear wall plate are arranged opposite to each other and spaced apart along the traveling direction of the film material of the bag making machine.

4. The flying knife mechanism of the bag-making machine according to claim 3, characterized in that: The front clamping device includes an upper front pressure plate and a lower front pressure plate arranged opposite to each other. The upper front pressure plate is mounted on the front wall plate by a front cylinder, and the lower front pressure plate is fixed to the front wall plate by a front seat plate.

5. The flying knife mechanism of the bag-making machine according to claim 4, characterized in that: The front cylinder is mounted on the inner wall of the front wall panel via a cylinder seat. The front wall panel has a front clearance groove corresponding to the front cylinder. The piston rod of the front cylinder is connected to the front upper pressure plate via a front spherical connector. The front upper pressure plate is slidably connected to the front wall panel via a front guide rail.

6. The flying knife mechanism of the bag-making machine according to claim 3, characterized in that: The bottom surface of the upper front plate is machined with a front mounting groove, and a front silicone strip is embedded in the front mounting groove and sealed with Teflon tape.

7. The flying knife mechanism of the bag-making machine according to claim 3, characterized in that: The rear clamping device includes a rear upper pressure plate and a rear lower pressure plate arranged opposite to each other. The rear upper pressure plate is connected to a fixed plate via a rear cylinder. The two ends of the fixed plate are respectively connected to the front wall plate and the rear wall plate via upper support plates. The two ends of the rear lower pressure plate are respectively connected to the bottom plate, the front wall plate, and the rear wall plate via lower support plates.

8. The flying knife mechanism of the bag-making machine according to claim 7, characterized in that: The rear cylinder is mounted on the side wall of the fixed plate via a cylinder seat. The fixed plate has a rear clearance groove corresponding to the rear cylinder. The piston rod of the rear cylinder is connected to the rear upper pressure plate via a rear spherical connector. The rear upper pressure plate is slidably connected to the fixed plate via a rear guide rail.

9. The flying knife mechanism of the bag-making machine according to claim 7, characterized in that: The bottom surface of the rear upper pressure plate is machined with a rear mounting groove, and a rear silicone strip is embedded in the rear mounting groove and sealed with Teflon tape.

10. The flying knife mechanism of the bag-making machine according to claim 7, characterized in that: The front wall panel is provided with a feed inlet and a waste outlet. The side of the fixing plate is provided with a waste trough extending to the waste outlet. The rear wall panel is provided with a discharge outlet, the top of which is flush with the top of the rear clearance groove.

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