Bag making machine with rear pasting handle

Abstract

The invention relates to the field of packaging machinery, and discloses a bag making machine with rear-mounted handle sticking, which comprises a bag body forming conveying line for continuously conveying paper materials and a handle conveying line for handle forming, and the bag body forming conveying line and the handle conveying line intersect at a handle sticking mechanism; a square bottom forming mechanism used for folding and bonding bag bottoms to form sealed square bottoms is arranged on the bag body forming conveying line, a connecting mechanism is arranged between the handle pasting mechanism and the bag body forming conveying line, and each handle pasting device comprises a control device. The first handle conveying roller, the speed sensing device, the cutter roller and the handle pasting component are sequentially arranged in the handle conveying direction. The linear speed of the cutter roller and the linear speed of the handle pasting component are the same S2. Through closed-loop control, it is ensured that the handle pasting position is located in the center of the bag body, the accuracy and consistency of the handle pasting position are improved, and it is ensured that the handle is located in the center of the bag body in the width direction.

Description

Technical Field

[0001] This invention relates to the field of packaging machinery, and more particularly to a bag-making machine with a rear-mounted handle. Background Technology

[0002] Existing square-bottom paper bag production lines typically employ a method where the handles are attached before the bag body is folded into a tube. This means the handles are pre-attached to the sheet material during output, followed by folding, sealing, cutting, and bottom forming to complete the bag production. This process has several significant drawbacks: the bag opening area is unevenly thick after the handles are attached. Because the handles are already attached to the sheet material, the opening area thickens considerably during subsequent folding due to the added adhesive and handle material. Furthermore, the extended handle ropes can easily interfere with equipment components during transport, such as being scraped or pulled by clamping mechanisms, causing the handles to detach or the bag to shift. This is particularly problematic during the tube forming and bottom folding stages, as the attached handles affect the bag yield and equipment stability. Because the process rhythms of the bag forming process (including feeding, pre-cutting, tube forming, bag cutting, waste removal, square bottom forming, etc.) and the handle forming process are different, the linear speeds of the two conveyor lines often differ, resulting in bag pulling, accumulation, or waiting phenomena at the handle attaching station, affecting production continuity and product quality.

[0003] Secondly, existing handle-attaching mechanisms lack an effective speed feedback control mechanism, especially in terms of lateral handle positioning. Existing equipment struggles to ensure the handle is accurately centered on the bag body, affecting product aesthetics and load-bearing balance. Current technologies typically involve machining a positioning hole in the handle itself during transport, and then using a mechanism on the machine to insert into this hole to position the handle forward and backward. For example, Chinese utility model patent CN207579218U, "A Handle Cutting and Positioning Device on a Handle Forming Machine," describes this approach. Figure 2As shown, the bag handle is provided with handle positioning holes. As described in paragraph 0017 of the instruction manual: the handle to be cut is transmitted to the handle positioning roller 2 through two guide rollers 1. The handle grip is inserted into the handle grip groove 8. Each handle pressure roller 3 will press the handle tightly onto the handle positioning roller 2. When the handle to be cut is wrapped around the handle positioning roller 2, the handle positioning pin 6 will be lifted by the action of the cam 5 and inserted into the positioning hole of the handle to be cut. The guide roller 3 rotates. When the handle to be cut leaves the handle positioning roller 2, each handle positioning pin 6 will retract into the handle positioning roller 2 under the combined action of the compression spring 7 and the cam 5. Since the spacing of the handle positioning holes is equal and the spacing of each handle positioning pin 6 is equal, each handle positioning pin 6 will accurately be inserted into each handle positioning hole in sequence. The distance between the handle positioning roller 2 and the cutting blade 4 remains constant, and the transmission is constant. In this way, the handle to be cut, which is positioned by the handle positioning roller 2, will be accurately cut by the cutting blade 4. The size of each handle, the distance from the handle to the cut edge, and the distance of each positioning hole will remain constant. This positioning method will result in unsightly holes on the handle, and if the positioning structure is offset from the center of the positioning hole, it is easy to puncture the handle during rotation.

[0004] Secondly, the conveyor speed transition is not smooth when the bag is transferred from the square bottom forming mechanism to the handle attaching mechanism. If the output speed of the square bottom forming mechanism does not match the input speed of the handle attaching mechanism, it can easily cause bag deformation or seal damage.

[0005] Therefore, there is an urgent need for a bag-making machine that places the sticking process after the square base is formed, and solves the technical problem of connecting the two speeds. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a bag-making machine with a rear-mounted handle.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A bag making machine with a handle attached at the end includes a bag forming conveyor line for continuously conveying paper material and a handle conveyor line for forming the handle. The bag forming conveyor line and the handle conveyor line intersect at a handle attaching mechanism. A square bottom forming mechanism for folding and gluing the bag bottom to form a sealed square bottom is provided on the bag forming conveyor line. A bag strip feeding mechanism and a handle forming mechanism are arranged sequentially along the handle forming direction on the handle conveyor line.

[0008] The handle attaching mechanism is used to attach handles to both sides of the formed bag body. The handle attaching mechanism includes a bag body conveying turntable and a handle attaching device. The bag body conveying turntable is mounted on the mounting frame. The bag body conveying turntable is circumferentially provided with a first handle attaching station and a second handle attaching station. The bag body conveying turntable is provided with bag body conveying components. The handle attaching mechanism is provided with at least two sets of handle attaching devices. The handle attaching devices are conveyed and connected to the handle forming mechanism. The handle formed by the handle forming mechanism is attached to the bag opening position of the first handle attaching station and the second handle attaching station respectively through the handle attaching devices.

[0009] A connecting mechanism is provided between the handle attaching mechanism and the bag forming conveyor line. The upstream of the connecting mechanism is connected to the square bottom forming mechanism. The connecting mechanism includes a receiving station for receiving the formed bag body output from the upstream and an output station for sending the formed bag body to the input end of the handle attaching mechanism. The receiving station and the output station are connected by a bag body transfer component. The output station is equipped with a bag delivery conveyor component to send out the bag body at a conveying speed of D2.

[0010] Each handle-attaching device includes a control device, and also includes a first handle conveying roller, a speed sensing device, a cutting roller, and a handle-attaching component arranged sequentially along the handle conveying direction; the linear speed of the cutting roller and the handle-attaching component is the same as S2; the speed sensing device senses the conveying speed of the first handle conveying roller sending out the handle and transmits the speed signal to the control device; the control device controls the linear speed S1 of the first handle conveying roller to be consistent with the linear speed S2 of the cutting roller, and at the same time, when the handle is conveyed laterally and continuously conveyed through the first handle conveying roller and the cutting roller and attached by the handle-attaching component, its lateral position corresponds to the center position of the formed bag body; The linear speed D2 of the bag conveying component, which is equal to the linear speed of the bag exiting component, is matched with the linear speed S2 of the handle attaching component. This ensures that the time intervals for the bag conveying component to transport the bag, the time intervals for the bag transfer component to transport the bag to the output station, the time intervals for the cutting roller to cut a unit bag handle, and the time intervals for the handle attaching component to attach the bag handle to the bag transfer component are all the same. By setting a speed sensor to monitor the handle conveying speed of the first handle conveying roller in real time, and by controlling the device to keep the first linear speed S1 consistent with the second linear speed S2 of the cutting roller, speed fluctuations of the handle during the conveying process are effectively eliminated. Since the handle is always at a stable speed when the cutting roller cuts the handle, the speed compensation is effectively achieved by adjusting the linear speed S1 of the first handle conveying roller, so that the time interval between two adjacent handles is consistent with the cutting roller and the handle attaching component, avoiding errors in handle cutting length or handle attaching position caused by speed mismatch. Meanwhile, the control device ensures that the handle's lateral position always corresponds to the center of the formed bag body during the lateral conveying process, passing through the first handle conveying roller, the cutting roller, and finally to the handle-attaching component. This achieves precise lateral centering of the handle, ensuring that the handle-attaching position is centered in the width direction of the bag, improving the product's aesthetics and balance under load. By matching the linear speed D2 of the bag conveying component and the bag exit conveying component with the linear speed S2 of the handle-attaching component, and unifying four key time intervals, precise synchronization between bag conveying and handle attachment is achieved. This ensures that when each bag arrives at the handle-attaching station, the corresponding handle has just been cut and is ready for attachment, significantly improving the accuracy of the handle-attaching position and production continuity.

[0011] This process changes the traditional "attach first, fold later" model, placing the handle attachment step after the bag body is basically formed. The connecting mechanism connects the bag bottom forming and handle attachment stages. By adjusting the speed, the speed of the bag bottom forming and handle attachment can be different, allowing users to easily adjust the speed. This completely avoids the problem of uneven bag opening thickness caused by attaching the handle in advance in traditional processes. It also prevents the handle or bag body from being scratched or damaged during folding, attaching, and bag bottom forming, significantly reducing the scrap rate. Through the combination of the connecting mechanism and the handle attachment mechanism, the handle attachment process is postponed. The linear speed of the discharge conveyor is greater than or equal to the linear speed of the transfer component, allowing the upstream bag body to be pulled away immediately, avoiding accumulation at the output station and achieving continuous high-speed production.

[0012] Preferably, the linear velocity of the bag conveying component is equal to the conveying linear velocity D1 of the bag output from the square bottom forming mechanism, and the linear velocity D2 of the bag output conveying component is not less than the linear velocity D1 of the bag conveying component. With the square bottom forming mechanism and the connecting mechanism having equal speeds, there is no relative slippage of the bag during conveying. This allows for consistent conveying speeds of the conveying component, the square bottom forming mechanism, the discharge conveying component, and the handle attaching mechanism, eliminating the need to completely unify the speeds to a single pace, thus facilitating adjustments to the assembly line speed by operators.

[0013] Preferably, the time intervals for the square bottom forming mechanism to output a unit of bag, the time intervals for the handle forming mechanism to output a unit of handle, the intervals for the bag conveying component on the handle attaching mechanism to convey bags, and the intervals for the bag transfer component to convey bags to the output station are all matched, all being T1. The conveying speed S1 of the handle forming mechanism outputting handles is matched with the conveying speed D1 of the bag outputting square bottom forming mechanism, making T1 equal. This allows the bag to be directly attached to the handle attaching mechanism without stopping, eliminating waiting time and further improving efficiency. The matching method can be complete speed matching, or the handle attaching mechanism can be set to have an idle stroke to match the linear speed of the discharge conveying component. The purpose is to keep the quantity and speed of bag and handle outputs coordinated, achieving complete rhythm matching between the bag forming line and the handle forming line, ensuring that the equipment maintains a strict synchronization relationship even when running at high speeds.

[0014] Preferably, the handle-attaching component has material-supporting components corresponding to the first and second handle-attaching stations. The material-supporting components and the handle-attaching components are located on both sides of the bag opening. The handle-attaching component rotates and presses the single handle onto the bag opening on the material-supporting component. By setting the material-supporting components at the handle-attaching stations and positioning them on both sides of the bag opening, the rotation of the handle-attaching component presses the single handle onto the bag opening on the material-supporting component, a stable support platform is provided for the bag opening, preventing deformation or displacement of the bag opening during the attaching process, and improving the strength and appearance quality of the handle.

[0015] Preferably, when the bag is located at the first and second attaching stations, the bag opening extends beyond the bag conveyor turntable and the opening orientation has rotated at least 90°. A limiting element is circumferentially arranged on the outer surface of the bag conveyor turntable, contacting the outer surface of the bag to keep it pressed against the turntable. The turntable rotates under the drive of a power source, or / and the limiting element moves the bag, causing it to be conveyed clockwise or counterclockwise along the turntable. The bag conveying component is either the turntable or the limiting element. The bag undergoes a turn of more than 90° on the turntable, allowing for attaching to both sides of the bag separately. This saves floor space compared to flipping the bag over, facilitating double-sided attaching. Two independent attaching devices operate at two different stations, completing double-sided attaching within the same turntable cycle, significantly improving efficiency. The limiting component, combined with the bag conveyor turntable, allows the bag opening to be suspended in mid-air, while the main body of the bag bottom is attached to the bag conveyor turntable. The bag can stably enter the first and second bag attaching stations in sequence for attaching the bag, without the interference of other mechanisms. After attaching the bag, the bag is formed and the handle will not affect other processes.

[0016] Preferably, the transfer component and the discharge conveying component adopt any one of the following methods: pushing, clamping from above and below, bottom suction conveying, or robotic arm picking and conveying; the formed bag stays at the output station waiting for the discharge conveying component or the bag transfer component and the discharge conveying component to keep the formed bag from stopping by synchronizing their speeds.

[0017] Preferably, the transfer component and the discharge conveyor are both pushers mounted on different chains. The pushers form a cyclical motion path on the chains. After the transfer component delivers the formed bag to the output station, the discharge conveyor pushes the formed bag out of the output station. The transfer component and the discharge conveyor are staggered in position at the output station. The connecting mechanism is a steering mechanism. The conveying direction of the square-bottom forming mechanism is perpendicular to the conveying direction of the handle-attaching mechanism, and the handle conveying line is parallel to the bag forming conveying line, making the bag-making machine production line U-shaped. This U-shaped production line layout significantly shortens the straight-line length of the equipment, saves production space, and facilitates operators monitoring the operation of both conveyor lines from the same side.

[0018] Preferably, the speed sensing device is a photoelectric sensor or a vision sensor, which senses the handle conveying speed by sensing the same handle position or the edge position of the strip on the front and rear handles.

[0019] Preferably, the handle-attaching device also includes a storage wheel, which is slidably mounted on a guide rail via a slider. The continuously conveyed handle passes through the storage wheel and then through a first handle conveying roller. When the speed of the first handle conveying roller changes, causing a speed difference in the output speed of the handle forming mechanism, the slider adjusts the distance between the storage wheel and the first handle conveying roller by raising and lowering. This change in speed effectively buffers the impact of speed fluctuations on handle tension, preventing excessive stretching or slack wrinkling of the handle, and ensuring the stability of continuous handle conveying and the accuracy of the cutting length.

[0020] Preferably, the system also includes a bag forming conveyor line for continuous conveying of paper stock. Along the direction of paper stock travel, the bag forming conveyor line is sequentially equipped with a paper roll unloading mechanism, a bag opening pre-cutting mechanism, a tube forming and accordion edge folding mechanism, a bag cutting mechanism, and a bag bottom waste removal mechanism. The paper roll unloading mechanism releases and tensions the paper roll material. The bag opening pre-cutting mechanism includes a pre-cutting blade to form a bag opening cut line with concave and convex portions on the paper stock. The tube forming and accordion edge folding mechanism folds the paper stock into a tube shape and forms a double-sided accordion edge structure, including a single-sided folding guide and accordion edge folding wheels on both sides. The bag cutting mechanism includes a high-speed conveying roller and a low-speed conveying roller, which drive the front and rear bags to separate along the bag opening cut line due to speed difference. The bag bottom waste removal mechanism removes excess waste from the bottom of the bag to make the bottom flat, and includes a cutter. A waste adsorption chamber is located below the cutter, and the waste adsorption chamber is connected to a negative pressure source. It achieves efficient waste removal by using a negative pressure adsorption chamber to collect waste. The negative pressure adsorption can completely remove waste and keep the work surface clean and tidy.

[0021] This invention, by adopting the above technical solutions, has significant technical effects: This invention's bag-making machine changes the traditional pre-attachment-then-folding method, placing the handle attachment step after the bag body is basically formed. This completely avoids the problem of uneven bag opening thickness caused by attaching the handle in advance in traditional processes, preventing damage to the handle or bag body during folding, attaching, and bottom forming, significantly reducing the scrap rate. The machine can operate continuously, and the speed of the bottom forming mechanism and the metal handle mechanism can be different; speed matching can be achieved simply through a connecting mechanism, improving efficiency. The debugging and maintenance of each functional module are convenient, and the dual-station turntable handle attachment ensures symmetrical and secure handles, improving appearance quality.

[0022] This invention solves the problem in existing bag-making machines where perforation of the handle is required to center the lateral position of the handle during bag forming. It achieves precise speed matching and cycle synchronization between the bag forming line and the handle forming line. Closed-loop control ensures the stability of the handle conveying speed, lateral centering control ensures the handle is centered on the bag, a connecting mechanism enables a smooth transition between conveying lines in different directions, and a U-shaped layout optimizes space utilization. It improves the accuracy and consistency of the handle placement, ensuring the handle is centered in the bag's width direction, enhancing the bag's balance under load, effectively buffering the impact of speed fluctuations in the front-end handle forming on the material, resulting in a higher yield, increased production speed, and improved equipment stability. It eliminates the risk of damaging the handle or bag, making it more suitable for high-speed automated production. Attached Figure Description

[0023] Figure 1 This is a top view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the intersection of the bag forming conveyor line and the handle conveyor line at the handle attaching mechanism. Figure 4 This is a structural diagram of the handle attachment mechanism; Figure 5 yes Figure 3 Another structural diagram; Figure 6 This is a schematic diagram of the adhesive sticking device; Figure 7 yes Figure 4 Another structural diagram from another angle; Figure 8 This is a structural diagram of the connecting mechanism.

[0024] The parts referred to by the numbers in the above attached diagrams are as follows: 100, Bag forming conveyor line; 110, Paper roll feeding mechanism; 200, Handle conveyor line; 210, Bag strip feeding mechanism; 220, Handle forming mechanism; 300, Bag mouth pre-cutting mechanism; 310, Pre-cutting blade; 400, Tube forming accordion edge folding mechanism; 410, Single-sided folding guide; 420, Accordion edge folding wheel; 500, Bag cutting mechanism; 510, Low-speed conveyor roller; 520, High-speed conveyor roller; 600, Bag bottom waste removal mechanism; 660, Cutting knife; 7 00. Square bottom forming mechanism; 800. Connecting mechanism; 810. Receiving station; 820. Output station; 830. Transfer component; 840. Discharge conveying component; 900. Handle attaching mechanism; 910. Mounting frame; 920. Bag conveying turntable; 930. Limiting component; 940. Handle attaching device; 941. Material support component; 942. Handle attaching component; 943. Cutting roller; 944. Control device; 945. First handle conveying roller; 946. Speed ​​sensor; 947. Storage wheel; 948. Slider; 949. Guide rail. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] Example 1 A bag-making machine with a rear-mounted handle, such as Figure 1-2 As shown, the bag forming conveyor line 100 for continuous conveying of paper material and the handle conveyor line 200 for handle forming are included. The bag forming conveyor line 100 and the handle conveyor line 200 intersect at the handle attaching mechanism 900. The bag forming conveyor line 100 is provided with a square bottom forming mechanism 700 for folding and gluing the bag bottom to form a sealed square bottom. The handle conveyor line 200 is provided with a bag strip feeding mechanism 210 and a handle forming mechanism 220 in sequence along the handle forming direction.

[0027] like Figure 3-4As shown, the handle attaching mechanism 900 is used to attach handles to both sides of the formed bag body. The handle attaching mechanism 900 includes a bag body conveying turntable 920 and a handle attaching device 940. The bag body conveying turntable 920 is mounted on the mounting frame 910. The bag body conveying turntable 920 is circumferentially provided with a first handle attaching station and a second handle attaching station. The bag body conveying turntable 920 is provided with a bag body conveying component. The handle attaching mechanism 900 is provided with at least two sets of handle attaching devices 940. The handle attaching devices 940 are conveyed and connected to the handle forming mechanism 220. The handle formed by the handle forming mechanism 220 is attached to the bag opening position of the first handle attaching station and the second handle attaching station by the handle attaching devices 940 respectively.

[0028] like Figure 5 and Figure 8 As shown, a connecting mechanism 800 is provided between the handle attaching mechanism 900 and the bag forming conveyor line 100. The upstream of the connecting mechanism 800 is connected to the square bottom forming mechanism 700. The connecting mechanism 800 includes a receiving station 810 for receiving the formed bag body output from the upstream and an output station 820 for sending the formed bag body to the input end of the handle attaching mechanism 900. The receiving station 810 and the output station 820 are connected by a bag body transfer component 830. The output station 820 is provided with a bag delivery conveyor component 840, which sends out the bag body at a conveying speed of D2.

[0029] like Figure 6-7 As shown, each set of handle attaching devices 940 includes a control device 944, and also includes a first handle conveying roller 945, a speed sensing device 946, a cutting roller 943, and a handle attaching component 942 arranged sequentially along the handle conveying direction; the linear speed of the cutting roller 943 and the handle attaching component 942 is the same as S2; the speed sensing device 946 senses the conveying speed of the first handle conveying roller 945 sending out the handle and transmits the speed signal to the control device 944; the control device 944 controls the linear speed S1 of the first handle conveying roller 945 to be consistent with the linear speed S2 of the cutting roller 943, and at the same time makes the handle transversely conveyed sequentially through the first handle conveying roller 945 and the cutting roller 943 and attached by the handle attaching component 942, so that its transverse position corresponds to the center position of the formed bag body; The linear speed of the bag conveying component conveying the formed bag is equal to the linear speed of the bag exiting conveying component 840, D2, and is matched with the linear speed of the handle attaching component 942, so that the time interval of the bag conveying component conveying the bag on the handle attaching mechanism 900, the time interval of the bag conveying component 830 conveying the bag to the output station 820, the time interval of the cutting roller 943 cutting the unit bag handle, and the time interval of the handle attaching component 942 attaching the bag handle to the bag on the bag conveying component 830 are the same.

[0030] The linear velocity of the bag transfer component 830 is equal to the conveying linear velocity D1 of the bag output from the square bottom forming mechanism 700, and the linear velocity D2 of the bag output conveying component 840 is not less than the linear velocity D1 of the bag transfer component 830.

[0031] The time interval for the square bottom forming mechanism 700 to output a unit bag, the time interval for the handle forming mechanism 220 to output a unit handle, the interval for the bag conveying component of the handle attaching mechanism 900 to convey a bag, and the interval for the bag conveying component 830 to convey a bag to the output station 820 are all matched and are all T1. The conveying speed S1 of the handle forming mechanism 220 to output a handle is adapted to the conveying speed D1 of the bag output by the square bottom forming mechanism 700 so that T1 is equal.

[0032] The attaching component 942 is provided with a material support component 941 at the first attaching station and the second attaching station respectively. The material support component 941 and the attaching component 942 are located on both sides of the bag opening. The attaching component 942 rotates and presses the single handle onto the bag opening on the material support component 941.

[0033] When the bag is located at the first and second attaching stations, the bag opening extends beyond the bag conveyor turntable 920 and the bag opening orientation has rotated at least 90°. A limiting member 930 is arranged circumferentially on the outer surface of the bag conveyor turntable 920. The limiting member 930 contacts the outer surface of the bag to keep the bag pressed against the outer surface of the bag conveyor turntable 920. The bag conveyor turntable 920 rotates under the drive of a rotary power source and / or the limiting member 930 drives the bag to move, so that the bag is conveyed along the bag conveyor turntable 920 in a clockwise or counterclockwise direction. The bag conveying component is the bag conveyor turntable 920 or the limiting member 930.

[0034] The transfer component 830 and the discharge conveying component 840 adopt any one of the following methods: pushing, clamping from above and below, bottom suction conveying, or robotic arm suction conveying; the formed bag stays at the output station 820 waiting for the discharge conveying component 840 or the bag transfer component 830 and the discharge conveying component 840 to keep the formed bag from stopping by synchronizing their speeds.

[0035] The transfer component 830 and the discharge conveyor component 840 are both pushers mounted on different chains. The pushers form a cycle of motion path on the chain. After the transfer component 830 sends the formed bag to the output station 820, the discharge conveyor component 840 pushes the formed bag out of the output station 820. The transfer component 830 and the discharge conveyor component 840 are staggered in position on the output station 820. The connecting mechanism 800 is a steering mechanism. The conveying direction of the square bottom forming mechanism 700 is perpendicular to the conveying direction of the handle attaching mechanism 900. The handle conveying line 200 is parallel to the bag forming conveying line 100, making the bag making machine production line U-shaped.

[0036] The speed sensing device 946 is a photoelectric sensor or a vision sensor that senses the handle conveying speed by sensing the same handle position or the edge position of the strip on the front and rear handles.

[0037] The handle attaching device 940 also includes a storage roller 947, which is slidably mounted on a guide rail 949 via a slider 948. The continuously conveyed handle passes through the storage roller 947 and then through a first handle conveying roller 945. When the speed of the first handle conveying roller 945 changes, causing a speed difference in the discharge speed of the handle forming mechanism 220, the slider 948 adjusts the distance between the storage roller 947 and the first handle conveying roller 945 by raising and lowering. The slider 948 can be actively adjusted by connecting to a lifting power source, which is connected to a control device 944. Alternatively, it can be passively adjusted based on the handle conveying speed, but this adjustment is not possible when the handle conveying tension decreases.

[0038] It also includes a bag forming conveyor line 100 for continuous conveying of paper stock. Along the paper stock's travel direction, the bag forming conveyor line 100 is sequentially equipped with a paper roll unloading mechanism 110, a bag opening pre-cutting mechanism 300, a tube forming and accordion edge folding mechanism 400, a bag cutting mechanism 500, and a bag bottom waste removal mechanism 600. The paper roll unloading mechanism 110 is used to release and tension the paper roll material; the bag opening pre-cutting mechanism 300 includes a pre-cutting barb 310, used to form a bag opening cutting line with concave and convex portions on the paper stock; the tube forming and accordion edge folding mechanism 400, used to... The paper material is folded into a cylindrical shape to form a double-sided accordion edge structure, including a single-sided folding guide 410 and accordion edge folding wheels 420 on both sides; the bag cutting mechanism 500 includes a high-speed conveying roller 520 and a low-speed conveying roller 510, which drive the front and rear bags to separate along the bag opening cutting line by speed difference; the bag bottom waste removal mechanism 600 is used to remove excess waste material from the bottom of the bag body to make the bag bottom flat, including a cutter 660, and a waste material adsorption chamber is provided below the cutter 660, which is connected to a negative pressure source.

[0039] Working principle: The paper roll is unwound by the paper roll unwinding mechanism 110. The preceding continuous paper material is conveyed forward by the conveying rollers on the bag conveyor line 100. After passing through steps such as correction, it enters the bag opening pre-cutting mechanism 300. The pre-cutting blade 310 is mounted on a roller connected to a rotating power source. Rotation forms a bag opening cut line. The protruding part of the bag opening at the previous bag opening becomes the concave part of the bag bottom of the next bag. Meanwhile, the continuously conveying paper material enters the tube forming accordion edge folding mechanism 400, causing one side of the bag to fold towards the other... The bag is folded sideways, forming a concave edge under the action of the accordion edge folding wheels 420 on both sides. Simultaneously, with the previous adhesive applied, the sides overlap and bond together. The continuous cylindrical bag body is then flattened and enters the bag-cutting mechanism 500. The high-speed conveyor roller 520 presses down on and carries the previous bag body, while the low-speed conveyor roller 510 presses down on and drives the next bag body. A speed difference between each pair of bags achieves separation. At this point, the bag opening is complete, and the bag bottom is then processed. The bag body then enters the bag bottom cleaning mechanism 600, where the bottom is flattened by a cutter. Excess waste enters the waste adsorption chamber and is sucked out by a negative pressure source for further processing. The bag body then enters the square bottom forming mechanism 700 for indentation, bottom opening, and bag folding, finally outputting a complete bag body. The bag handle conveyor before the handle attaching mechanism delivers the formed continuous bag handles to the handle attaching mechanism 900. During operation, the square bottom forming mechanism 700 continuously outputs formed bags at a first linear velocity D1, with a time interval of T1 between each bag output. The bag transfer component 830 transfers the bags from the receiving station 810 to the output station 820 at the same linear velocity D1, with a time interval of T1 between bag arrivals at the output station 820. The bag delivery component 840 delivers the bags to the handle attaching mechanism 900 at a second linear velocity D2, and the bag delivery component also delivers the bags at a linear velocity D2, with a time interval of T1 between bag deliveries.

[0040] The transfer component 830 uses a double-row chain pusher (the chain is not shown in the diagram, only the sprockets are shown). The intervals between adjacent pushers reaching the receiving station are equal, and the movement speed is consistent with the output rhythm of the square bottom forming mechanism 700. The discharge conveying component 840 above the output station 820 is also set on the chain, and its linear speed is equal to the outer circumferential linear speed of the subsequent bag conveying turntable 920. Simultaneously with or after a short wait at the conveying station 820, the discharge conveying component 840 arrives and pushes the bag, ensuring a smooth transfer. The linear speed D2 of the bag discharge conveying component 840 is not less than the linear speed D1 of the bag transfer component 830. When D2 equals D1, the bag remains at the output station 820 waiting for the push from the discharge conveying component 840; when D2 is greater than D1, the bag transfer component 830 and the discharge conveying component 840 coordinate their speeds to ensure continuous, direct transport of the formed bag without stopping.

[0041] The handle conveyor line 200 is used for handle forming, and it has a bag strip feeding mechanism 210 and a handle forming mechanism 220 arranged sequentially along the handle forming direction. The bag strip feeding mechanism 210 releases handle material, and the handle forming mechanism 220 cuts, folds, or glues the handle material to form a handle of a predetermined shape. The bag forming conveyor line 100 and the handle conveyor line 200 intersect at the handle attaching mechanism 900.

[0042] The bag conveyor turntable 920 rotates until the bag reaches the attachment position that mates with the material support component 941. The bag opening is precisely between the material support component 941 and the attachment component 942. As the attachment component 942 rotates upward, it attracts the attachment. The attachment component 942 continues to descend with a slight angle to complete the attachment, and simultaneously or before this, the negative pressure attraction is released. The bag sequentially passes through the first attachment station and the second attachment station. The attachment components 942 at the first and second attachment stations respectively attach the attachment to both sides of the bag opening. The bag flips on the surface of the bag conveyor turntable 920. Since the bag opening rotates at least 90°, it is preferable that the attachment components 942 of both attachment devices are located above or diagonally above the material support component 941. When attaching the bag handle, the bag handle is diagonally above or above the bag, which facilitates attachment to the surface of the bag opening. Finally, after passing through two stations, the bag is sent out from the bag discharge outlet and detached from the bag conveyor turntable 920, and sent to the subsequent collection or packaging process.

[0043] The cutting roller 943 and the handle attaching component 942 share the same second linear velocity S2. The speed sensing device 946, which can be a photoelectric sensor or a vision sensor, senses the handle conveying speed by detecting the same handle position or the edge position of the adhesive strip on both handles and transmits the speed signal to the control device 944. Based on the received speed signal, the control device 944 controls the first linear velocity S1 of the first handle conveying roller 945 to maintain consistency with the second linear velocity S2 of the cutting roller 943 through frequency conversion speed regulation or servo control. Simultaneously, the control device 944 adjusts the cutting position of the cutting roller by adjusting the speed of the first handle conveying roller 945, ensuring that during the lateral conveying process, as the handle sequentially passes through the first handle conveying roller 945 and the cutting roller 943 and is attached by the handle attaching component 942, its lateral position corresponds to the center position of the formed bag body, achieving precise lateral centering.

[0044] Simultaneously, the handle forming mechanism 220 outputs handles at a conveying speed S1 adapted to D1, with a time interval of T1 between each output handle. After being buffered by the storage wheel 947, the handle is conveyed by the first handle conveying roller 945. The speed sensor 946 monitors the actual conveying speed of the handle in real time, and the control device 944 adjusts the rotational speed of the first handle conveying roller 945 according to the feedback signal, ensuring that its first linear velocity S1 is consistent with the second linear velocity S2 of the cutter roller 943. At the same time, the control device 944 ensures that the handle is aligned with the center of the bag body in the lateral position. The cutter roller 943 rotates at a linear velocity S2, with a time interval of T1 between cutting each bag handle. Since the linear speed D2 of the bag conveying component matches the linear speed S2 of the handle attaching component 942 (i.e., D2=S2), and the handle attaching action time interval of the handle attaching component 942 is also T1, when the bag arrives at the handle attaching station, the handle attaching component 942 presses the handle cut by the cutter roller 943 onto the center of the bag opening, achieving precise synchronous handle attaching and lateral centering.

[0045] The bag making machine's control system coordinates the start and stop of the bag conveyor turntable 920, the timing of cutting, and the switching on and off of negative pressure to ensure strict synchronization of each workstation.

[0046] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A bag-making machine with a rear-mounted handle, characterized in that: It includes a bag forming conveyor line (100) for continuous conveying of paper material and a handle conveyor line (200) for handle forming, wherein the bag forming conveyor line (100) and the handle conveyor line (200) intersect at the handle attaching mechanism (900); The bag forming conveyor line (100) is equipped with a square bottom forming mechanism (700) for folding and gluing the bottom of the bag to form a sealed square bottom. A bag strip feeding mechanism (210) and a handle forming mechanism (220) are sequentially arranged along the handle forming direction on the handle conveyor line (200). A handle attaching mechanism (900) is used to attach handles to both sides of the formed bag body. The handle attaching mechanism (900) includes... A bag conveying turntable (920) is mounted on a mounting frame (910). The bag conveying turntable (920) is circumferentially provided with a first attaching station and a second attaching station. A bag conveying component is provided on the bag conveying turntable (920). The handle attaching device (940) and the handle attaching mechanism (900) are provided with at least two sets of handle attaching devices (940). The handle attaching device (940) is connected to the handle forming mechanism (220). The handle formed by the handle forming mechanism (220) is attached to the bag opening position of the first handle attaching station and the second handle attaching station respectively through the handle attaching device (940). A connecting mechanism (800) is provided between the handle attaching mechanism (900) and the bag forming conveyor line (100), and the upstream of the connecting mechanism (800) is connected to the square bottom forming mechanism (700); The connecting mechanism (800) includes a receiving station (810) for receiving the formed bag body output from the upstream and an output station (820) for sending the formed bag body to the input end of the handle attaching mechanism (900). The receiving station (810) and the output station (820) are connected by a bag body transfer component (830). The output station (820) is provided with a bag delivery conveying component (840) to send out the bag body at a conveying speed of D2. Each handle attaching device (940) includes a control device (944), and also includes a first handle conveying roller (945), a speed sensing device (946), a cutting roller (943), and a handle attaching component (942) arranged sequentially along the handle conveying direction; the linear velocity of the cutting roller (943) and the handle attaching component (942) is the same as S2; The speed sensing device (946) senses the conveying speed of the first handle conveying roller (945) sending out the handle and transmits the speed signal to the control device (944). The control device (944) controls the linear speed S1 of the first handle conveying roller (945) to be consistent with the linear speed S2 of the cutter roller (943). At the same time, when the handle is conveyed laterally and continuously conveyed through the first handle conveying roller (945) and the cutter roller (943) and pasted by the handle pasting component (942), its lateral position corresponds to the center position of the formed bag body. The linear speed of the bag conveying component conveying the formed bag is equal to that of the bag exit conveying component (840), and the linear speed of the handle attaching component (942) is matched with that of the handle attaching component (942). This makes the time intervals of the bag conveying component conveying the bag on the handle attaching mechanism (900), the time intervals of the bag conveying component (830) conveying the bag to the output station (820), the time intervals of the cutting roller (943) cutting the unit bag handle, and the time intervals of the handle attaching component (942) attaching the bag handle to the bag on the bag conveying component (830) the same.

2. The bag-making machine with a post-attached handle as described in claim 1, characterized in that: The linear velocity of the bag transfer component (830) is equal to the conveying linear velocity D1 of the bag output by the square bottom forming mechanism (700), and the linear velocity D2 of the bag output conveying component (840) is not less than the linear velocity D1 of the bag transfer component (830).

3. A bag-making machine with a post-attached handle as described in claim 2, characterized in that: The time interval between the output of a unit bag by the square bottom forming mechanism (700), the time interval between the output of a unit handle by the handle forming mechanism (220), the interval between the transport of the bag by the bag conveying component of the handle attaching mechanism (900) and the interval between the transport of the bag by the bag transfer component (830) to the output station (820) are all matched and are all T1. The conveying speed S1 of the handle output by the handle forming mechanism (220) is adapted to the conveying speed D1 of the bag output by the square bottom forming mechanism (700) so that T1 is equal.

4. A bag-making machine with a post-attached handle as described in claim 1, characterized in that: The sticking handle component (942) is provided with a material support component (941) corresponding to the first sticking handle station and the second sticking handle station. The material support component (941) and the sticking handle component (942) are located on both sides of the bag opening. The sticking handle component (942) rotates and presses the single handle onto the bag opening on the material support component (941).

5. A bag-making machine with a post-attached handle as described in claim 4, characterized in that: When the bag body is located at the first and second attaching stations, the bag opening extends outside the bag body conveying turntable (920) and the bag opening orientation is rotated at least 90°. A limiting member (930) is arranged circumferentially on the outer surface of the bag conveying turntable (920). The limiting member (930) contacts the outer surface of the bag to keep the bag pressed against the outer surface of the bag conveying turntable (920). The bag conveying turntable (920) rotates under the drive of a rotary power source or / and the limiting member (930) drives the bag to move, so that the bag is conveyed along the bag conveying turntable (920) in a clockwise or counterclockwise direction. The bag conveying component is either a bag conveying turntable (920) or a limiting component (930).

6. A bag-making machine with a post-attached handle as described in claim 1, characterized in that: The transfer component (830) and the discharge conveying component (840) adopt any one of the following methods: pushing, clamping from above and below, bottom suction conveying, or robotic arm suction conveying; the formed bag stays at the output station (820) waiting for the discharge conveying component (840) or the bag transfer component (830) and the discharge conveying component (840) to keep the formed bag from stopping by synchronizing their speeds.

7. A bag-making machine with a post-attached handle as described in claim 6, characterized in that: The transfer component (830) and the discharge conveyor component (840) are both pushers set on different chains. The pushers form a cycle of motion path on the chain. After the transfer component (830) sends the formed bag to the output station (820), the discharge conveyor component (840) pushes the formed bag out of the output station (820). The transfer component (830) and the discharge conveyor component (840) are staggered in position on the output station (820). The connecting mechanism (800) is a turning mechanism. The conveying direction of the square bottom forming mechanism (700) is perpendicular to the conveying direction of the handle attaching mechanism (900). The handle conveying line (200) is parallel to the bag forming conveying line (100), so that the bag making machine production line is U-shaped.

8. A bag-making machine with a post-attached handle as described in claim 1, characterized in that: The speed sensing device (946) is a photoelectric sensor or a vision sensor, which senses the handle conveying speed by sensing the same handle position or the edge position of the strip on the front and rear handles.

9. A bag-making machine with a post-attached handle as described in claim 1, characterized in that: The handle attaching device (940) also includes a storage wheel (947). The storage wheel (947) is mounted on the guide rail (949) by a slider (948). The continuously conveyed handle passes through the storage wheel (947) and then through the first handle conveying roller (945). When the speed of the first handle conveying roller (945) changes, causing a speed difference in the discharge speed of the handle forming mechanism (220), the slider (948) adjusts the distance between the storage wheel (947) and the first handle conveying roller (945) by raising and lowering.

10. A bag-making machine with a post-attached handle as described in claim 1, characterized in that: It also includes a bag forming conveyor line (100) for continuous conveying of paper stock, wherein the bag forming conveyor line (100) is provided with the following components sequentially along the paper stock travel direction: A paper roll unloading mechanism (110) is used to release and tension the paper roll material; The bag opening pre-cutting mechanism (300) includes a pre-cutting dagger (310) for forming a bag opening cut line with a concave and a convex portion on the paper stock; The tube folding accordion edge mechanism (400) is used to fold paper into a tube shape and form a double-sided accordion edge structure, including a single-sided tube folding guide (410) and accordion edge folding wheels (420) on both sides. The bag breaking mechanism (500) includes a high-speed conveying roller (520) and a low-speed conveying roller (510). The high-speed conveying roller (520) and the low-speed conveying roller (510) drive the front and rear bags to separate along the bag opening cutting line by speed difference. The bag bottom cleaning mechanism (600) is used to remove excess waste from the bottom of the bag to make the bottom of the bag flat. It includes a cutter (660) and a waste adsorption chamber is provided below the cutter (660). The waste adsorption chamber is connected to a negative pressure source.

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