Residue discharging device for bag making machine and bag making machine

Abstract

The present application reliably prevents the attachment of a residue to an upper blade or a lower blade of a cross-cutting device. A residue removal device (5) for a bag making machine, which is installed in a bag making machine that makes a plastic bag from a plastic film (10, 11), the bag making machine being provided with a cross-cutting device (31) that cross-cuts the plastic film (10, 11), the cross-cutting device (31) being provided with an upper blade (310) and a lower blade (311), the residue removal device (5) being provided with a scraper portion (50) configured to sweep a residue (W) of the plastic film (10, 11) formed by the cross-cutting device (31) from the upper blade (310) or the lower blade (311).

Description

Technical Field

[0001] This invention relates to a residue removal device for a bag-making machine installed on a bag-making machine that manufactures plastic bags from plastic film, and to the bag-making machine itself. Background Technology

[0002] In the bag-making machine described in Patent Document 1, a plastic film is intermittently conveyed by a conveying roller, and the plastic film is cut along a slit line in the length direction. Then, during each intermittent conveying of the plastic film, a cross-cutting device is used to cross-cut the plastic film, thereby producing a plastic bag.

[0003] In this bag-making machine, during each intermittent feeding of the plastic film, a corner-cutting device punches and cuts the corners of the plastic film. Then, a cross-cutting device cross-cuts the plastic film, but during this cross-cutting, the device performs two cuts at predetermined intervals, spaced apart from the cutting baseline in the width direction of the plastic film. As a result, no significant height difference is created at the cut corners of the plastic bag.

[0004] In this bag-making machine, after the plastic film is cut and punched, two transverse cuts are made across the cutting baseline in the width direction of the plastic film. Therefore, during the transverse cuts, linear residue is generated in the width direction of the plastic film.

[0005] However, the cross-cutting device has an upper blade and a lower blade. Typically, plastic films are made of laminated films, which are prone to static electricity. Due to this static electricity, residue sometimes adheres to either the upper or lower blade.

[0006] In addition, the laminated film consists of a stacked substrate layer and a sealing layer. The sealing layer is made of a material with a low melting point and functions as an adhesive during heat sealing. However, when the laminated film is subjected to large shear forces by the cutting device, sometimes residual sealing layer adheres to the upper or lower cutting edge.

[0007] If residue adheres to the upper or lower cutting edge, the cutting sharpness of subsequent cross-cutting operations may be reduced. Additionally, residue adhering to the upper or lower cutting edge may be further cut shorter, thus becoming small foreign objects that get into the plastic bag. If residue gets into the plastic bag, it will subsequently mix with the contents of the plastic bag.

[0008] On the other hand, the bag-making machine described in Patent Document 2 can attract and discharge residue into the suction passage, and can detect residue using an optical sensor. This bag-making machine can determine whether all residue in each area has been discharged.

[0009] However, while the bag-making machine can determine whether residue has been removed, it cannot reliably prevent residue from adhering to the upper or lower blade of the cross-cutting device.

[0010] Prior art literature

[0011] Patent documents

[0012] Patent Document 1: Japanese Patent No. 2805515

[0013] Patent Document 2: Japanese Patent Application Publication No. 2018-199215 Summary of the Invention

[0014] The problem that the invention aims to solve

[0015] Therefore, the problem to be solved by the present invention is to provide a residue removal device for a bag making machine and a bag making machine that can reliably prevent residue from adhering to the upper or lower blade of the cross-cutting device.

[0016] Methods for solving problems

[0017] The residue removal device for a bag making machine of the present invention is a residue removal device installed on a bag making machine that manufactures plastic bags from plastic film. The bag making machine has a cross-cutting device for cross-cutting the plastic film. The cross-cutting device has an upper blade and a lower blade. The residue removal device has a scraper section. The scraper section is configured to sweep away the residue of the plastic film formed by the cross-cutting device from the upper blade or the lower blade.

[0018] Preferably, the scraper part has a main body and a brush part, with the brush part disposed in the main body to clean residue from the upper or lower blade.

[0019] Preferably, the residue removal device has a linkage mechanism that is linked to the lifting of the upper blade. Through the linkage mechanism, the scraper part approaches the tip of the upper blade as the upper blade descends, and moves away from the tip of the upper blade as the upper blade rises.

[0020] Preferably, the linkage mechanism is configured to rotate the scraper section in conjunction with the lifting and lowering of the upper blade.

[0021] Preferably, the linkage mechanism comprises: a plate that moves up and down in linkage with the lifting of the upper blade; a cam groove disposed on the plate; and a cam follower that engages with the cam groove.

[0022] In particular, the residue removal device also has a suction mechanism configured to attract the residue swept off from the upper or lower blade.

[0023] Preferably, the suction mechanism has a cover portion configured to cover the scraper portion and fit snugly against the lower blade.

[0024] Invention Effects

[0025] According to the present invention configured in this way, it is possible to reliably prevent residue from adhering to the upper or lower blade of the cross-cutting device. Attached Figure Description

[0026] Figure 1 This is a top view showing the bag-making machine.

[0027] Figure 2 This is a side view showing the bag-making machine.

[0028] Figure 3 This is an enlarged top view showing the downstream section of the bag-making machine.

[0029] Figure 4 The upper and lower blades of the cross-cutting device are shown. Figure 4 A is the front view. Figure 4 B is a side view.

[0030] Figure 5 This is a front view showing the residue removal device.

[0031] Figure 6 yes Figure 5 AA sectional view.

[0032] Figure 7 yes Figure 5 View B.

[0033] Figure 8 yes Figure 5 The C-direction view.

[0034] Figure 9 This is an explanatory diagram used to illustrate the operation of the residue removal device.

[0035] Figure 10 It continues Figure 9 Explanatory diagram.

[0036] Figure 11 These are explanatory diagrams illustrating other embodiments. Detailed Implementation

[0037] Hereinafter, an embodiment of the residue removal device for a bag-making machine and a bag-making machine of the present invention will be described based on the accompanying drawings. The X, Y, and Z directions are mutually orthogonal directions.

[0038] Figure 1 This is a top view showing the bag-making machine. Figure 2 This is a side view showing the bag-making machine. Figure 1 as well as Figure 2 The bag-making machine is called a two-row bag-making machine, which makes two plastic bags at a time. The bag-making machine has an accumulator 20 and a conveying roller 21. A strip of plastic film 1 with a width in the Y direction is continuously rolled out from the raw material 1' at a constant speed through the accumulator 20 via the conveying roller 21.

[0039] The bag-making machine includes a slitting machine 22. The plastic film 1 is cut along its length (X direction) by the slitting machine 22 to form two main materials 10 and 11. The main materials 10 and 11 are transported along the X direction with their bodies facing each other in the Z direction.

[0040] The bag-making machine is equipped with a tension regulating device 23. The main materials 10 and 11 pass through the tension regulating device 23. The tension regulating device 23 appropriately converts the transport of the main materials 10 and 11 from continuous transport to intermittent transport. Therefore, the main materials 10 and 11 are intermittently transported downstream of the tension regulating device 23. That is, downstream of the tension regulating device 23, the main materials 10 and 11 are transported, temporarily stopped, and then transported again. In intermittent transport, transport and temporary stops are repeated alternately.

[0041] The bag-making machine includes a guide roller 24. The main body materials 10 and 11 are guided to the guide roller 24 and overlap each other at the position of the guide roller 24. The bag-making machine includes a transport roller 25, through which the main body materials 10 and 11 are intermittently transported in the X direction while overlapping.

[0042] The bag-making machine is equipped with a heat-sealing device 26. The heat-sealing device 26 includes a longitudinal sealing device (not shown) extending in the X direction. During temporary stops of intermittent transport, the longitudinal sealing device heat-seals the main materials 10 and 11 along the length direction (X direction) using heat-sealing components, etc. Thus, a predetermined portion of the main materials 10 and 11 is heat-sealed, forming a longitudinal sealing portion 12. Figure 3 ).

[0043] The heat-sealing device 26 also includes a transverse sealing device (not shown) extending along the Y direction. During temporary stops in intermittent transport, the transverse sealing device heat-seals the main materials 10 and 11 along the width direction (Y direction) using heat-sealing components. Thus, a predetermined portion of the main materials 10 and 11 is heat-sealed, forming a transverse sealing portion 13. Figure 3 ).

[0044] The bag-making machine has three corner-cutting devices 27 arranged along the Y direction. During temporary stops in intermittent transport, the corner-cutting devices 27 punch the main body materials 10 and 11 using a punching blade or a Thomson blade, thereby forming the corner cut 14. Figure 3 The chamfered portion 14 is disposed within the transverse sealing portion 13, and is disposed at both ends and the center of the main body materials 10 and 11 in the width direction (Y direction).

[0045] The bag-making machine has two slit-forming devices 28 arranged along the Y direction. During temporary stops in intermittent transport, the slit-forming devices 28 punch the main body materials 10 and 11 using punching blades, thereby forming slit portions 15. Figure 3The cutout 15 is disposed within the transverse sealing portion 13 and is disposed at predetermined intervals in the width direction (Y direction) of the main body materials 10 and 11.

[0046] The bag-making machine includes a slitting machine 29. The slitting machine 29 makes a cut along the length direction (X direction) at the center of the width direction (Y direction) of the main body materials 10 and 11. Thus, a cut line 16 is formed along the length direction (X direction) at the center of the width direction (Y direction) of the main body materials 10 and 11. Figure 3 The bag making machine is equipped with a conveying roller 30, and the main materials 10 and 11 are intermittently conveyed by the conveying roller 30 along the X direction.

[0047] The bag-making machine is equipped with a cross-cutting device 31. For example... Figure 4 As shown, the cross-cutting device 31 includes an upper blade 310 and a lower blade 311. The upper blade 310 moves up and down in the vertical direction (Z direction) via a drive mechanism (not shown), while the lower blade 311 is fixed. The drive mechanism is constructed using known technology such as a crank mechanism. The upper end of the lower blade 311 is formed by a flat surface extending in the horizontal direction (Y direction). Figure 4 B). The upper cutting edge 310 extends with the tip 310a inclined relative to the horizontal direction (Y direction). Even when the upper cutting edge 310 is raised, the edge of the tip 310a of the upper cutting edge 310 ( Figure 4 The right side of A also overlaps and meshes with the lower blade 311. Figure 4 B), as a result, the main materials 10 and 11 are smoothly cut off sequentially from one end edge by the downward movement of the upper blade 310.

[0048] During each intermittent stop of transport, the cross-cutting device 31 cross-cuts the main materials 10 and 11 along their width direction (Y direction) using the upper blade 310 and lower blade 311. The cross-cutting occurs within the transverse sealing portion 13 of the main materials 10 and 11. In this embodiment, since it is a two-row bag-making machine, two plastic bags are formed from the main materials 10 and 11 during each cross-cutting.

[0049] The bag-making machine includes a conveyor device 32. The conveyor device 32 includes a pair of conveyors arranged opposite each other in the Z direction. The conveyor device 32 is configured to intermittently transport plastic bags formed from the main materials 10 and 11 in accordance with the timing of cross-cutting.

[0050] The cross-cutting device 31 is configured to move a predetermined interval D upstream and downstream in the X direction via a drive mechanism (not shown). The drive mechanism is constructed using known technology such as a ball screw mechanism. The cross-cutting device 31 cross-cuts the main body materials 10 and 11, but the cross-cutting device 31 cuts the main body materials 10 and 11 across a cutting reference line 1a in the width direction (Y direction). Figure 3The process involves two transverse cuts to the main materials 10 and 11 at a specified interval D. As a result, no significant height difference is formed at the cut portion 14 and the corner portion 15 of the plastic bag.

[0051] In this bag-making machine, the main materials 10 and 11 are transversely cut twice at a predetermined interval D, separated by a cutting reference line 1a in the width direction. Therefore, after the transverse cutting, a residue W with a width of the predetermined interval D is formed. Figure 10 (B~E). That is, the residue W extends between the cut portion 14 and the chamfered portion 15 of the main body materials 10 and 11 and has a width of a predetermined interval D. Therefore, as Figure 3 As shown, in this embodiment, four linear residues W are formed.

[0052] As described above, the main materials 10 and 11 are made of plastic film 1. Plastic film 1 is usually made of laminated film, which is prone to static electricity. Due to the generation of static electricity, residue W sometimes adheres to the upper blade 310 or lower blade 311 of the cross-cutting device 31.

[0053] In addition, the laminated film consists of a stacked substrate layer and a sealing layer. The sealing layer is made of a material with a low melting point and functions as an adhesive during heat sealing by the heat sealing device 26. However, when the laminated film is subjected to large shear forces by the cross-cutting device 31, the sealing layer of the residue W sometimes adheres to the upper blade 310 or the lower blade 311.

[0054] If residue W adheres to the upper blade 310 or the lower blade 311, the cutting sharpness of subsequent cross-cutting operations may be reduced. Additionally, residue W adhering to the upper blade 310 or the lower blade 311 may be further shortened, thus becoming part of the plastic bag as small foreign objects. If residue W is mixed into the plastic bag, it may subsequently contaminate the contents of the plastic bag.

[0055] Therefore, the bag-making machine is equipped with a residue removal device 5 that reliably removes residue W from the upper blade 310 and the lower blade 311. For example... Figure 1 as well as Figure 2 As shown, the residue removal device 5 is adjacent to the downstream side of the cross-cutting device 31. The residue removal device 5 is configured to move a predetermined interval D upstream and downstream in the X direction together with the cross-cutting device 31 via a drive mechanism (not shown).

[0056] like Figure 5 as well as Figure 6 As shown, the residue removal device 5 includes a scraper section 50. The scraper section 50 extends in the Y direction with a length approximately the same as the width of the main body materials 10 and 11 and the lengths of the upper blade 310 and the lower blade 311. The scraper section 50 is configured to sweep away residue W from the upper blade 310 or the lower blade 311.

[0057] When the main materials 10 and 11 are transversely cut by the transverse cutting device 31, residue W is generated from the main materials 10 and 11, and the residue W may adhere to any position on the upper blade 310 or the lower blade 311. As a result, the scraper portion 50 is provided to extend longer than the width of the main materials 10 and 11, so that the residue W adhering to any position on the upper blade 310 or the lower blade 311 can be cleaned. Thus, regardless of the position of the residue W formed from the main materials 10 and 11, the scraper portion 50 can clean the residue W from the upper blade 310 or the lower blade 311.

[0058] like Figure 5 As shown, the upper end of the scraper portion 50 extends obliquely relative to the horizontal direction (Y direction), similar to the upper blade 310, and is parallel to the upper end of the upper blade 310. Since the upper blade 310 moves up and down to cut the main body materials 10, 11, the residue W usually adheres to the upper blade 310. By making the scraper portion 50 parallel to the upper blade 310, the residue W can be reliably cleaned from the upper blade 310.

[0059] like Figure 6 As shown, the scraper portion 50 includes a main body portion 500 and a brush portion 501 disposed along the upper end of the main body portion 500. The brush portion 501 extends from the main body portion 500 toward the upper blade 310 and the lower blade 311 in the X direction. The brush portion 501 is configured such that multiple bristles made of synthetic or natural resin are installed on the main body portion 500, and it has a predetermined thickness in the Z direction. As a result, the area of ​​the brush portion 501 that can clean the residue W from the upper blade 310 and the lower blade 311 can be increased, and as a result, the residue W can be reliably cleaned from the upper blade 310 and the lower blade 311.

[0060] like Figure 5 As shown, the residue removal device 5 includes a linkage mechanism 51 that is linked to the lifting and lowering of the upper blade 310. The scraper portion 50 is configured such that, via the linkage mechanism 51, it approaches the tip 310a of the upper blade 310 as the upper blade 310 descends, and moves away from the tip 310a of the upper blade 310 as the upper blade 310 rises. The linkage mechanism 51 includes a plate 510 mounted on the upper blade 310 and raised and lowered in linkage with the upper blade 310. The plate 510 extends along the Z direction.

[0061] The linkage mechanism 51 has a cam groove 511 disposed on the plate 510. Figure 7 The cam groove 511 extends along the Z direction in a predetermined shape. The linkage mechanism 51 includes a cylindrical cam follower 512 that is mounted on the main body 500 of the scraper portion 50 and protrudes in the Y direction. The cam follower 512 is fitted into the cam groove 511. The linkage mechanism 51 may also be provided on both sides of the upper blade 310 instead of only on one side of the upper blade 310.

[0062] Thus, the linkage mechanism 51 is configured such that the plate 510 rises and falls in conjunction with the lifting of the upper blade 310, the cam groove 511 rises and falls together with the lifting of the plate 510, and the main body 500 of the scraper section 50 moves in conjunction with the lifting of the cam groove 511. By setting the linkage mechanism 51 as a mechanical structure such as the cam groove 511 and the cam follower 512, a simple structure with fewer parts can be achieved, resulting in excellent productivity and reduced malfunctions.

[0063] like Figure 6 As shown, the scraper portion 50 has a rotating shaft 502 at the lower end of the main body portion 500 and is configured to rotate around the rotating shaft 502. By rotating the main body portion 500, the brush portion 501 can approach or move away from the upper blade 310 and the lower blade 311. As a result, the brush portion 501 separates from the upper blade 310 before transversely cutting the main body materials 10 and 11, thereby not obstructing the transverse cutting device 31. In addition, after transversely cutting the main body materials 10 and 11, it approaches the upper blade 310, thereby reliably sweeping away the residue W adhering to the upper blade 310 or the lower blade 311.

[0064] like Figure 5 As shown, the residue removal device 5 includes a suction mechanism 52. The suction mechanism 52 is configured to suction the residue W swept off from the upper blade 310 or the lower blade 311. The suction mechanism 52 includes a cover portion 520 that covers the scraper portion 50. The cover portion 520 is fan-shaped in front view. Figure 5 ), which appears as a U-shape when viewed from above. Figure 8 It is configured to fit snugly against the lower blade 311. As a result, a sealed space is formed between the cover 520 and the lower blade 311. Figure 8 A scraper section 50 is configured in this enclosed space.

[0065] The suction mechanism 52 includes a suction source 521 connected to the lower end of the cover 520. The suction source 521 is configured to suction the interior of the cover 520. As described above, the interior of the cover 520 is sealed to improve suction efficiency, so the suction source 521 generates an airflow from the upper side of the brush 501 downwards, which can reliably attract and remove the residue W swept down by the scraper 50.

[0066] Next, the operation of the cross-cutting device 31 and the residue removal device 5 will be explained.

[0067] The main materials 10 and 11 were moved to the cross-cutting device 31 and temporarily stopped. Figure 9A) The main materials 10 and 11 are held by the conveyor device 32 and subjected to a specified tension. The upper blade 310 stops at the upper stop point, and the main materials 10 and 11 stop between the upper blade 310 and the lower blade 311. The scraper portion 50 is arranged such that the main body portion 500 extends along the Z direction, and is separated from the upper blade 310 and the lower blade 311, so that the brush portion 501 does not obstruct the cross-cutting of the cross-cutting device 31.

[0068] Subsequently, during the temporary cessation of the main materials 10 and 11, the upper cutting edge 310 descends from the upper dead center. Figure 9 B). As a result, the main materials 10 and 11 were removed from one end edge ( Figure 4 A) Initiate the cutting. Afterwards, the upper cutting edge 310 further descends ( Figure 9 C), when the upper edge 310 descends to the lower dead center ( Figure 9 D) The main materials 10 and 11 are cut in the width direction (Y direction).

[0069] The plate 510 of the linkage mechanism 51 is linked to the downward movement of the upper blade 310. Figure 5 As the plate 510 descends, the cam groove 511 descends as well. The cam follower 512, located on the main body 500 of the scraper section 50, moves along the cam groove 511. Consequently, the main body 500 rotates about the rotation axis 502, and the brush section 501 approaches the upper blade 310. Figure 9 C and Figure 9 D).

[0070] After that, the upper blade 310 rises ( Figure 9 E), the transverse cut ends. The plate 510 of the linkage mechanism 51 (linked to the rising of the upper blade 310) Figure 5 The cam groove 511 rises together with the rise of the plate 510. The cam follower 512 provided on the main body 500 of the scraper part 50 moves along the cam groove 511. As a result, the main body 500 rotates back about the rotation axis 502, causing the brush part 501 to move away from the upper blade 310. As a result, the brush part 501 separates from the upper blade 310 and the lower blade 311 so as not to obstruct the cross-cutting of the cross-cutting device 31.

[0071] Subsequently, during the temporary cessation of the main materials 10 and 11, the cross-cutting device 31 and the residue removal device 5 move a predetermined distance D upstream in the X direction. Figure 10 A). As a result, the downstream ends of the main materials 10 and 11 after transverse cutting protrude a specified distance D from the tip of the upper blade 310 downstream.

[0072] Subsequently, during the temporary cessation of the main materials 10 and 11, the upper cutting edge 310 descends from the upper dead center. Figure 10 B). As a result, the main materials 10 and 11 were removed from one end edge ( Figure 4 A) Initiate the cutting. Afterwards, the upper cutting edge 310 further descends ( Figure 10 C), when the upper edge 310 descends to the lower dead center ( Figure 10 D), the main body materials 10 and 11 are cut in the width direction (Y direction). Thus, the transverse cutting device 31 is positioned across the cutting reference line 1a in the width direction (Y direction) of the main body materials 10 and 11. Figure 3 The main materials 10 and 11 are cut twice at a specified interval D, so that no prominent height difference is formed at the cut part 14 and the corner part 15 of the plastic bag.

[0073] The main materials 10 and 11 are transversely cut twice at a predetermined interval D, separated by a cutting reference line 1a in the width direction. Therefore, after the transverse cut, a residue W with a width of the predetermined interval D is formed. Figure 10 D). That is, the residue W is at the cut portion 14 and the chamfered portion 15 of the main materials 10 and 11 ( Figure 3 Extending between ) and having a width with a specified interval D. Therefore, as Figure 3 As shown, in this embodiment, four linear residues W are formed.

[0074] The plate 510 of the linkage mechanism 51 is linked to the downward movement of the upper blade 310. Figure 5 As the scraper plate 510 descends, the cam groove 511 descends along with the plate 510. The cam follower 512, located on the main body 500 of the scraper section 50, moves along the cam groove 511. Consequently, the main body 500 rotates about the rotation axis 502, and the brush section 501 approaches the upper blade 310. Figure 10 C and Figure 10 D). The residue W initially adheres to the surface of the upper blade 310, but the brush portion 501 brushes the surface of the lower blade 311 from the surface of the upper blade 310. Thus, the brush portion 501 can reliably sweep off the residue W adhering to the upper blade 310 or the lower blade 311.

[0075] The brush portion 501 extends obliquely relative to the horizontal direction (Y direction) in a manner parallel to the upper end of the scraper portion 50, and is parallel to the upper end of the upper blade 310. Therefore, the brush portion 501 cleans the upper blade 310 within the width direction (Y direction) of the main body materials 10, 11 at approximately the same time as the descent of the upper blade 310. As a result, the brush portion 501 can reliably remove residue W adhering to the upper blade 310 or the lower blade 311.

[0076] When the main materials 10 and 11 are transversely cut, they have passed through the attraction source 521 of the attraction mechanism 52. Figure 5 Begin to inhale. Figure 10D). As a result, the residue W can be reliably discharged downwards through the synergistic effect of the downward flow of air in the narrow passage between the front end of the brush 501 and the surface of the lower blade 311, and the downward movement of the brush 501 on the surface of the lower blade 311.

[0077] After that, the upper blade 310 rises ( Figure 10 E), the transverse cut ends. The plate 510 of the linkage mechanism 51 (linked to the rising of the upper blade 310) Figure 5 The cam groove 511 rises together with the rise of the plate 510. The cam follower 512 provided on the main body 500 of the scraper part 50 moves along the cam groove 511. As a result, the main body 500 rotates back about the rotation axis 502, causing the brush part 501 to move away from the upper blade 310. As a result, the brush part 501 separates from the upper blade 310 and the lower blade 311 so as not to obstruct the cross-cutting of the cross-cutting device 31.

[0078] Afterwards, the cross-cutting device 31 and the residue removal device 5 move downstream in the X direction by a predetermined interval D and return to their original positions. Then, as described above, the main materials 10 and 11 move in the X direction and then temporarily stop. They then perform two operations at a predetermined interval D, passing the cutting reference line 1a of the main materials 10 and 11, to perform two cross-cuts on the main materials 10 and 11.

[0079] It should be noted that, as described above, after the first transverse cut of the main materials 10 and 11, the transverse cutting device 31 and the residue removal device 5 move a predetermined distance D upstream in the X direction to perform a second transverse cut on the main materials 10 and 11. At this time, if the upstream end of the cut main materials 10 and 11 on the downstream side is located at a position interfering with the downstream end of the upper blade 310, it may have an adverse effect on the subsequent cutting of the residue W. Therefore, it is preferable that, immediately after the first transverse cut of the main materials 10 and 11, the cut main materials 10 and 11 on the downstream side are transported downstream by the conveyor device 32.

[0080] Alternatively, in other embodiments, when the upper cutting edge 310 descends to the lower stop point, the upper cutting edge 310 may be moved towards... Figure 11 The upper edge 310 is tilted clockwise (tilting the upper part of the upper edge 310 upstream) so that the lower end of the upper edge 310 is away from the lower edge 311. This action is preferably performed immediately after the first transverse cut of the main body materials 10 and 11. Figure 9 ) was carried out, after the second transverse cut ( Figure 10 The action is not performed. This action can be performed using a known structure, for example, by placing a cylinder (not shown) near the upper part of the upper blade 310, and using the cylinder to press the upper part of the upper blade 310 upstream when the upper blade 310 descends to the lower dead center, thereby performing the above action.

[0081] Through this action, after the first transverse cut of the main materials 10 and 11, the transversely cut main materials 10' and 11' on the downstream side move rapidly to the downstream side. As a result, the transversely cut main materials 10' and 11' do not hinder the second transverse cut, and can prevent the residue W formed in the second transverse cut from being unintentionally scattered to the downstream side.

[0082] The preferred embodiments of the present invention have been described above, but the structure of the present invention is not limited to these embodiments.

[0083] The scraper portion 50 may, for example, replace the brush portion 501 with a claw portion with a sharp tip. The claw portion may be made of a soft material so that it can deform along the surfaces of the upper edge 310 and the lower edge 311. As a result, the claw portion can sweep away residue W from the upper edge 310 or the lower edge 311.

[0084] • The linkage mechanism 51 may include, for example, a detection unit that detects the lifting of the upper blade 310 and a drive mechanism that moves the scraper section 50. Based on the detection by the detection unit, the scraper section 50 is moved by the drive mechanism. The drive mechanism may be constructed using known technology such as a stepper motor connected to the rotation shaft 502.

[0085] • Depending on the type of bag being made, such as the size and material of the bag, the length of the bristles of the brush section 501, the amount of movement (rotation angle) of the scraper section 50, or the timing of moving the scraper section 50 can be changed.

[0086] The attraction source 521 of the attraction mechanism 52 is configured to be driven before the formation of residue W in order to attract residue W, but it can also be configured to continuously attract residue W in order to reliably attract residue W. By continuously attracting residue W, it is possible to reliably attract residue W and simplify control, thus achieving excellent productivity and maintainability.

[0087] • The surface of the upper blade 310 can also be processed with Teflon (registered trademark) or sandblasted. This reduces the adhesion between the main body materials 10, 11 and the upper blade 310, allowing for more reliable removal of residue W.

[0088] The effects of the present invention will be explained.

[0089] The residue removal device for a bag making machine of the present invention is a residue removal device installed on a bag making machine that manufactures plastic bags from plastic film. The bag making machine has a cross-cutting device for cross-cutting the plastic film. The cross-cutting device has an upper blade and a lower blade. The residue removal device has a scraper section. The scraper section is configured to sweep away the residue of the plastic film formed by the cross-cutting device from the upper blade or the lower blade.

[0090] According to the present invention configured in this way, it is possible to reliably prevent residue from adhering to the upper or lower blade of the cross-cutting device. That is, even if residue temporarily adheres to the upper or lower blade, it can be prevented from adhering to the upper or lower blade by cleaning the residue with the scraper. As a result, it is possible to prevent a decrease in the cutting sharpness of the cross-cutting process. In addition, it is possible to prevent the residue adhering to the upper or lower blade from being further cut shorter and mixed in as small foreign objects.

[0091] Preferably, the scraper part has a main body and a brush part, with the brush part disposed in the main body to clean residue from the upper or lower blade.

[0092] With this configuration, the brush section can reliably remove residue from either the upper or lower edge. Multiple bristles made of synthetic or natural resin are attached to the main body of the brush section, and these bristles possess a specified softness. Therefore, the area for removing residue from the upper edge is increased, resulting in reliable removal of residue from the upper edge.

[0093] Preferably, the residue removal device has a linkage mechanism that is linked to the lifting of the upper blade. Through the linkage mechanism, the scraper part approaches the tip of the upper blade as the upper blade descends, and moves away from the tip of the upper blade as the upper blade rises.

[0094] During cross-cutting, the upper blade descends, so although residue adheres to the surface of the upper blade, by bringing the scraper section close to the tip of the upper blade, the residue adhering to either the upper or lower blade can be reliably swept away. After cross-cutting, the upper blade rises, so by moving the scraper section away from the tip of the upper blade, the scraper section can be prevented from obstructing the cross-cutting.

[0095] Preferably, the linkage mechanism is configured to rotate the scraper section in conjunction with the lifting and lowering of the upper blade.

[0096] By rotating the scraper section, it can approach or move away from the upper and lower blades, resulting in a simple structure and excellent productivity and maintainability. Furthermore, the scraper section moves away from the upper blade before cutting the main material, so it does not hinder the cross-cutting of the cutting device. In addition, it approaches the upper blade after cutting the main material, thereby reliably sweeping away the residue adhering to the upper or lower blade.

[0097] The invention describes bags made of plastic materials, but is not limited to them. They can also be made of paper-based materials, or even bags made of a single material such as polyethylene, which is not plastic or a laminated material, and the effects of the invention can be achieved.

[0098] Preferably, the linkage mechanism comprises: a plate that moves up and down in linkage with the lifting of the upper blade; a cam groove disposed on the plate; and a cam follower that engages with the cam groove.

[0099] By setting the linkage mechanism as a mechanical structure such as a cam groove and a cam follower, a simple structure with fewer parts can be achieved, resulting in excellent productivity and reduced failures.

[0100] In particular, the residue removal device for the bag making machine has a suction mechanism configured to attract residue swept down from the upper or lower blade.

[0101] The suction mechanism draws in residue swept off the upper or lower blade by the scraper section, thereby reliably removing residue from the upper or lower blade. In other words, although residue swept off the upper or lower blade may re-adhere due to static electricity, the suction mechanism reliably prevents residue from re-adhering to the upper or lower blade.

[0102] Preferably, the suction mechanism has a cover portion configured to cover the scraper portion and fit snugly against the lower blade.

[0103] A sealed space is formed between the cover and the lower blade, and a scraper is disposed in this sealed space. Because the cover is sealed, the suction efficiency is improved, thus the suction effect based on the suction source is improved, and the scraper can reliably attract and remove the cleaned residue.

[0104] Explanation of reference numerals in the attached figures:

[0105] 1…plastic film;

[0106] 10, 11… Main materials;

[0107] 31… cross-cutting device;

[0108] 310… Upper edge;

[0109] 311…lower edge;

[0110] 5…Residue removal device;

[0111] 50…scraper section;

[0112] 500…Main body section;

[0113] 501…Brush Department;

[0114] 502… Rotary shaft;

[0115] 51… linkage mechanism;

[0116] 510…board;

[0117] 511…cam groove;

[0118] 512…cam follower;

[0119] 52…attracting institutions;

[0120] 520…covering;

[0121] W…residue.

Claims

1. A residue removal device for a bag-making machine, installed on a bag-making machine that manufactures plastic bags from plastic film, wherein, The bag-making machine is equipped with a cross-cutting device for cutting the plastic film. The cross-cutting device has an upper blade and a lower blade. The residue removal device includes: A scraper section configured to sweep away residue from the plastic film formed by the cross-cutting device through the upper or lower blade; and The linkage mechanism is linked to the lifting and lowering of the upper blade. The scraper section has a rotating shaft. The linkage mechanism is configured to rotate the scraper portion around the rotation axis in conjunction with the lifting and lowering of the upper blade. Through the linkage mechanism, the scraper portion approaches the tip of the upper blade as the upper blade descends, and moves away from the tip of the upper blade as the upper blade rises.

2. The residue removal device for a bag-making machine according to claim 1, wherein, The scraper part includes a main body and a brush part, the brush part being disposed on the main body to clean the residue from the upper or lower blade.

3. The residue removal device for a bag-making machine according to claim 1, wherein, The linkage mechanism has the following features: The plate, which moves up and down in conjunction with the lifting mechanism of the upper blade; A cam groove, which is disposed on the plate; and A cam follower that engages with the cam groove.

4. The residue removal device for a bag-making machine according to any one of claims 1 to 3, wherein, The residue removal device also includes a suction mechanism configured to attract the residue swept off the upper or lower blade.

5. The residue removal device for a bag-making machine according to claim 4, wherein, The suction mechanism has a cover portion configured to cover the scraper portion and be in close contact with the lower blade.

6. A bag-making machine, wherein, The bag-making machine uses the residue removal device for bag-making machines according to any one of claims 1 to 5.

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