A new cold-hot knife switching mechanism of bag cutting machine

Abstract

This utility model discloses a novel hot and cold blade switching mechanism for a bag cutting machine, relating to the field of bag making equipment technology. It includes a frame with a hot blade assembly, a cold blade assembly, and a feeding assembly. The hot and cold blade assemblies can cut the strip-shaped bag blank fed by the feeding assembly into bag bodies using hot and cold cutting methods. The frame is slidably equipped with a lifting seat that is driven to move up and down by a lead screw. The movement of the lifting seat allows the hot or cold blade assembly mounted on it to match the feeding assembly fixed to the frame. After the feeding assembly feeds the bag blank into the hot or cold blade assembly for cutting using upper and lower feeding rollers and feeding pressure rollers, several air blowing pipes in the feeding assembly can blow the bag body outwards. Compared with the prior art, this design, by simultaneously installing hot and cold blades on the same equipment, can achieve free switching of cutting methods, thereby enabling the cutting of bag blanks of different materials into bag bodies.

Description

Technical Field

[0001] This utility model relates to a switching mechanism, and more particularly to a novel hot and cold knife switching mechanism for a bag cutting machine, belonging to the technical field of bag making equipment. Background Technology

[0002] Existing bag-making machines use either hot cutting or cold cutting methods depending on the bag material when cutting the bag body. A search revealed a patent with publication number "CN207901741U" that discloses a woven bag inner film cutting machine, which can freely switch between cold and hot cutting processes on a single machine, thereby saving production costs for manufacturers. Similarly, the applicant has designed a novel hot and cold blade switching mechanism for a bag cutting machine and has filed the following application. Utility Model Content

[0003] To address the shortcomings of the existing technology, this utility model provides a novel hot and cold blade switching mechanism for a bag cutting machine.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a novel hot and cold blade switching mechanism for a bag cutting machine, comprising a frame having a hot blade assembly, a cold blade assembly, and a feeding assembly. The hot blade assembly and the cold blade assembly can cut the strip-shaped bag blank fed by the feeding assembly into the bag body by hot cutting and cold cutting methods. The frame is slidably provided with a lifting seat that is driven to move up and down by a screw. The movement of the lifting seat can match the hot blade assembly or cold blade assembly mounted on it with the feeding assembly fixed on the frame. After the feeding assembly feeds the bag blank into the hot blade assembly or cold blade assembly for cutting by the upper and lower feeding pressure rollers and feeding rollers, several air blowing pipes of the feeding assembly can blow the bag body outward.

[0005] Preferably, the hot knife assembly and the cold knife assembly each have a hot knife seat and a cold knife seat fixed on the lifting seat. When the lifting seat moves so that the hot knife seat or the cold knife seat matches the feeding assembly, the feeding assembly can transport the bag blank above it. The hot knife and the cold knife of the hot knife assembly and the cold knife assembly can be driven by the upper cam assembly and the lower cam assembly to approach the bag blank for cutting.

[0006] Preferably, the hot blade and cold blade of the hot blade assembly and the cold blade assembly are each slidably mounted on the lifting seat via a slider and a slide rail. When the upper cam assembly and the lower cam assembly drive the hot blade and cold blade to slide linearly, they can be moved closer to or further away from the hot blade seat and the cold blade seat respectively.

[0007] Preferably, the upper cam assembly and the lower cam assembly each have a rotatable shaft, and the cam eccentrically fixed on the shaft is fitted with a cam sleeve on its own rotation. The upper cam assembly and the lower cam assembly are connected to the hot knife and the cold knife respectively through the connecting arm of their respective cam sleeves, thereby driving them to slide linearly in the lifting seat.

[0008] Preferably, the hot knife assembly further includes a hot knife crossbeam, which is driven by an upper cam assembly to slide linearly by means of a slider and a slide rail.

[0009] Preferably, the hot knife assembly further includes a de-drying roller with several de-drying wheels. The de-drying roller can be driven to rotate by a pushing element provided on the hot knife beam, so that the de-drying wheels can rub open the hot-cut and bonded ends of the bag blank.

[0010] Preferably, the feeding roller, which is driven to rotate by the feeding roller motor, has several slots formed on its own. An air blowing pipe for blowing out the bag is laid at the slot, and its air inlet end is connected to the hollow pipe of the external air source provided on the frame.

[0011] Preferably, the feeding assembly is further provided with a feeding tray behind the feeding pressure roller and the feeding roller.

[0012] This utility model has at least the following advantages: 1. Cold and hot blades can be installed on the same equipment at the same time, and the cutting method can be changed freely to adapt to bag blanks of different materials; 2. The cut bag can be blown outward through the air tube to prevent the bag from remaining. Attached Figure Description

[0013] Figure 1 This is an installation diagram of this utility model.

[0014] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0015] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0016] Figure 4 yes Figure 3 Enlarged diagram of point B in the middle.

[0017] Figure 5 This is a structural schematic diagram of the feeding assembly.

[0018] Figure 6 This is an installation diagram of the hot knife assembly and the cold knife assembly.

[0019] Figure 7 yes Figure 6 A diagram of the back side.

[0020] In the diagram, 1-frame; 2-lifting seat; 201-lead screw; 202-lead screw motor; 3-hot knife assembly; 301-hot knife; 302-hot knife holder; 303-upper cam assembly; 313-rotating shaft motor; 323-rotating shaft; 333-cam; 343-cam sleeve; 353-connecting arm; 363-fisheye buckle; 304-hot knife crossbeam; 314-long connecting rod; 324-short connecting rod; 305-spring shaft; 306-exiting roller; 316-hinge; 30 7-Drop wheel; 317-Protrusion; 4-Cold knife assembly; 401-Cold knife; 402-Cold knife holder; 403-Lower cam assembly; 413-Gear; 404-Cold knife holder; 414-Connecting piece; 5-Feeding assembly; 501-Pressure roller; 511-Adjusting seat; 521-Feeding pressure roller; 502-Feeding roller; 512-Feeding roller motor; 522-Synchronous pulley; 532-Synchronous belt; 503-Air blowing pipe; 504-Support pipe; 505-Feeding tray. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-7 As shown: A novel hot and cold blade switching mechanism for a bag cutting machine includes a frame 1 and a lifting seat 2 which slides up and down in the frame 1 via sliders and slide rails on both sides. A lead screw 201 is installed at the bottom of the lifting seat 2. The lead screw 201 can be driven to rotate by a lead screw motor 202 installed in the frame 1, thereby causing the lifting seat 2 to move up and down. When the lifting seat 2 is displaced so that its hot blade assembly 3 or cold blade assembly 4 matches with the feeding assembly 5 fixed on the frame 1, the feeding assembly 5 can feed the strip-shaped bag blank to be cut into it. At this time, the hot blade 301 / cold blade 401 of the hot blade assembly 3 / cold blade assembly 4 can cut a bag body from the front end of the bag blank.

[0023] Furthermore, the aforementioned hot knife assembly 3 and cold knife assembly 4 are respectively disposed on the upper and lower sides of the lifting base 2. The hot knife holder 302 and cold knife holder 402 of each are fixed to the lifting base 2, while the hot knife 301 and cold knife 401 are slidably mounted on the lifting base 2 by means of other sliders and slide rails. When the lifting base 2 is displaced so that the hot knife holder 302 and cold knife holder 402 match the feeding assembly 5, the upper cam assembly 303 and lower cam assembly 403 of the hot knife assembly 3 and cold knife assembly 4 can drive the hot knife 301 and cold knife 401 to approach the hot knife holder 302 and cold knife holder 402, thereby cutting the bag blank.

[0024] Furthermore, the hot knife assembly 3 includes a hot knife crossbeam 304 that achieves displacement via the aforementioned slider and slide rail. The hot knife 301 is mounted below the hot knife crossbeam 304 via several long connecting rods 314. A short connecting rod 324 with a hinge joint is mounted on the top of the hot knife crossbeam 304. The upper cam assembly 303 is hinged to the short connecting rod 324 via a connecting arm 353 with a fisheye buckle 363, thereby driving the hot knife crossbeam 304 and the hot knife 301 to move downward when it moves.

[0025] Specifically, the aforementioned upper cam assembly 303 includes a rotating shaft 323 that is horizontally arranged on the top of the lifting seat 2 and can be driven to rotate by the rotating shaft motor 313. Two cams 333 that are eccentrically fixed on the rotating shaft 323 are rotatably sleeved on their outer sides with cam sleeves 343. The aforementioned connecting arm 353 with a fisheye buckle 363 is mounted on the cam sleeve 343. When the rotating shaft 323 rotates, the cam sleeve 343 can shift up and down due to the rotation of the cams 333, thereby dragging the hot knife crossbeam 304 and the hot knife 301 closer to or away from the hot knife seat 302 fixed on the lifting seat 2.

[0026] Furthermore, since the end opening of the bag blank may stick together after being cut by the hot knife 301, it is necessary to rub the end of the bag blank promptly after the hot cutting process to prevent it from closing upon cooling; such as Figure 2 , Figure 4 As shown, the hot knife beam 304 of the hot knife assembly 3 is also equipped with a de-drying roller 306 via a spring shaft 305. The de-drying roller 306 is equipped with several de-drying wheels 307, and a hinge lug 316 is formed in the middle of the roller. The pushing element fixed on the hot knife beam 304 is hinged to the hinge lug 316, thereby driving the de-drying roller 306 and the de-drying wheels to reciprocate. The protrusions 317 of the de-drying wheels 307 are used to rub open the glued ends of the bag blank (the pushing element is not shown in the drawings of this application, but it can be a cylinder. This part of the structure can be referred to in the prior patent with publication number "CN207901741U").

[0027] Furthermore, the aforementioned cold knife assembly 4 includes a cold knife holder 404 that achieves displacement via the aforementioned slider and slide rail. The cold knife 401 is directly fixed below the cold knife holder 404. The aforementioned lower cam assembly 403 is hinged to the connecting piece 414 on the side of the cold knife holder 404 via its own connecting arm 353, which also has a fisheye buckle 363. This allows it to drive the cold knife holder 404 and the cold knife 401 to move downwards when it moves.

[0028] Specifically, the lower cam assembly 403 and the upper cam assembly 303 have similar structural designs. That is, the lower cam assembly 303 also has a rotatable shaft 323, a cam 333 eccentrically fixed on the shaft 323, and a cam sleeve 343 with a connecting arm 353 and a fisheye buckle 363. However, in order to improve the utilization rate of the internal space of the equipment, the shaft 323 of the lower cam assembly 303 does not directly connect its end to the shaft motor 313. Instead, the shaft motor 313 is installed in the lifting seat 2, and the shaft motor 313 drives the shaft 323 to rotate by two meshing gears 413.

[0029] Furthermore, the aforementioned feeding assembly 5 includes a pressure roller 501 and a feeding roller 502 arranged vertically within the frame 1. The feeding roller 502 is rotatably fixed to the frame 1 by a feeding roller motor 512 via a synchronous pulley 522 and a synchronous belt 532. The pressure roller 501 is arranged above the feeding roller 502 with an adjustable seat 511 that can be finely adjusted vertically. Several feeding pressure rollers 521 are fixed at intervals on the pressure roller 501 and form a clamping gap with the feeding roller 502 to clamp the bag blank. When the feeding roller 502 rotates, the bag can be conveyed toward the hot knife assembly 3 / cold knife assembly 4.

[0030] Specifically, since the bag body remains on the hot knife holder 302 / cold knife holder 402 after the front end of the bag blank is cut out, and cannot be automatically output, the feeding assembly 5 also has several air blowing pipes 503 that can blow the bag body out, such as... Figures 3-4 As shown, the frame 1 has a feeding tray 505 fixed behind the pressure roller 501 and the feeding roller 502 by two support pipes 504. The rear end of the bag blank can be placed on the feeding tray 505. Both support pipes 504 are hollow tubes, and one of them, which is close to the pressure roller 501 and the feeding roller 502, is equipped with several air blowing pipes 503 facing the lifting seat 2. The air inlet end of the air blowing pipe 503 is connected to an external air source through the hollow support pipe 504, so that the bag body stuck on the hot knife holder 302 / cold knife holder 402 can be blown outward.

[0031] Specifically, in order to prevent the air blowing pipe 503 from being squeezed by the feeding roller 521 and the feeding roller 502, the feeding roller 502 has a groove on its surface, and the air blowing pipe 503 is laid in the groove.

[0032] The operation of this design is roughly as follows: First, the lead screw drives the lifting seat to move up and down, so that the hot knife holder / cold knife holder matches the feeding assembly; second, the pressure roller and feeding roller of the feeding assembly feed the bag blank into the hot knife holder / cold knife holder; then, the hot knife / cold knife descends to cut a bag body out of the bag blank. If the hot cutting method is used, the exit roller rotates after cutting to rub open the end of the bag blank; finally, the hot knife / cold knife returns to its original position, and the air blowing pipe blows the bag body outward.

[0033] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A novel hot and cold blade switching mechanism for a bag cutting machine, comprising a frame (1) having a hot blade assembly (3), a cold blade assembly (4), and a feeding assembly (5), wherein the hot blade assembly (3) and the cold blade assembly (4) can cut the strip-shaped bag blank fed by the feeding assembly (5) into a bag body by hot cutting and cold cutting, characterized in that: The frame (1) is slidably provided with a lifting seat (2) that is driven to move up and down by a lead screw (201). The displacement of the lifting seat (2) can make the hot knife assembly (3) or cold knife assembly (4) installed on itself match the feeding assembly (5) fixed on the frame (1). After the feeding assembly (5) feeds the bag blank into the hot knife assembly (3) or cold knife assembly (4) for cutting by the feeding pressure roller (521) and feeding roller (502) arranged above and below, the bag body can be blown out by several air pipes (503) of the feeding assembly (5).

2. The novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 1, characterized in that: The hot knife assembly (3) and the cold knife assembly (4) respectively have a hot knife seat (302) and a cold knife seat (402) fixed on the lifting seat (2). When the lifting seat (2) is displaced so that the hot knife seat (302) or the cold knife seat (402) matches the feeding assembly (5), the feeding assembly (5) can transport the bag blank to its top. The hot knife (301) and the cold knife (401) of the hot knife assembly (3) and the cold knife assembly (4) can be driven to approach the bag blank by the upper cam assembly (303) and the lower cam assembly (403) to cut it.

3. The novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 2, characterized in that: The hot knife (301) and cold knife (401) of the hot knife assembly (3) and the cold knife assembly (4) are respectively slidably mounted on the lifting seat (2) via sliders and slide rails. When the upper cam assembly (303) and the lower cam assembly (403) drive the hot knife (301) and the cold knife (401) to slide linearly, they can move closer to or further away from the hot knife seat (302) and the cold knife seat (402) respectively.

4. The novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 3, characterized in that: The upper cam assembly (303) and the lower cam assembly (403) each have a rotatable shaft (323). The cam (333) eccentrically fixed on the shaft (323) is fitted with a cam sleeve (343) on its own rotation. The upper cam assembly (303) and the lower cam assembly (403) are connected to the hot knife (301) and the cold knife (401) respectively through the connecting arm of their respective cam sleeves (343), thereby driving them to slide linearly in the lifting seat (2).

5. A novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 3, characterized in that: The hot knife assembly (3) also includes a hot knife crossbeam (304), which is equipped with the hot knife (301) and can be driven by the upper cam assembly (303) to slide linearly by means of a slider and a slide rail.

6. The novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 5, characterized in that: The hot knife assembly (3) also includes a decanting roller (306) having a plurality of decanting wheels (307). The decanting roller (306) can be driven to rotate by a pushing element provided on the hot knife beam (304) so ​​that the decanting wheels (307) can rub open the hot-cut and bonded ends of the bag blank.

7. A novel hot and cold blade switching mechanism for a bag cutting machine as described in any one of claims 1-6, characterized in that: The feeding roller (502), driven to rotate by the feeding roller motor (512), has several slots formed on itself. The air blowing pipe (503) for blowing out the bag body is laid at the slot, and its air inlet end is connected to the hollow pipe of the external air source provided on the frame (1).

8. A novel hot and cold blade switching mechanism for a bag cutting machine as described in claim 7, characterized in that: The feeding assembly (5) is further provided with a feeding tray (505) behind the feeding pressure roller (521) and the feeding roller (502).

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