Automatic film splicing mechanism for packaging machine

Abstract

The present invention discloses an automatic film splicing mechanism for a packaging machine, comprising a frame, on which are disposed a film changing frame, a film preparation mechanism, and a film feeding mechanism; the film changing frame is provided with two or more workstations circumferentially corresponding to a film roll, and the frame is provided with a first drive device for driving the film changing frame to rotate; the film preparation mechanism comprises a fixed film roller and a film loading roller, and the frame is provided with a second drive device for driving the film loading roller toward the film feeding mechanism; the film feeding mechanism comprises an idler roller and a pressure roller, and the frame is provided with a third drive device for driving the idler roller to rotate. The present invention allows multiple film rolls to be placed on the film changing frame. After the film feeding mechanism delivers one film roll, a new film roll can be loaded by the film preparation mechanism, thereby achieving automatic film splicing, eliminating the trouble of stopping the machine for film changing operations, and improving film feeding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging processing, in particular to an automatic film splicing mechanism of a packaging machine. Background Art

[0002] In daily life, a packaging machine is a machine used for packaging processing, including steps such as bag making and filling. The bag making process of the packaging machine is as follows: after folding film products such as film and non-woven fabrics in half, the bottom of the bag is directly formed. The film is segmented and hot-melt bonded by a heat sealing mechanism to form the side of the bag. After heat sealing, the die-cutting mechanism cuts it in the middle of the heat seal to form individual independent packaging bags. The film is continuously fed in rolls, and each roll of film can produce multiple packaging bags. After each roll of film is used up, a worker needs to replace it with a new roll of film. When changing the film, the machine needs to be stopped to remove the film roll and install the new film roll. The worker then unfolds the new roll of film and lays it on the subsequent production line, and then starts the production line to process the new roll of film. This film changing method requires workers to lay the new film backwards, and the laying process takes a long time. During the film changing, the subsequent production line is shut down, which delays production time. Therefore, a method of changing the film without stopping the machine is needed. Summary of the Invention

[0003] The purpose of the present invention is to avoid the deficiencies of the prior art and provide an automatic film splicing mechanism for a packaging machine, thereby effectively solving the deficiencies in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an automatic film splicing mechanism of a packaging machine, including a frame, on which a film changing frame, a film preparation mechanism and a film feeding mechanism are arranged; the film changing frame is provided with more than two workstations along the circumferential direction of the film roll, and the frame is provided with a first driving device for driving the film changing frame to rotate; the film preparation mechanism includes a fixed film roller and an upper film roller, and the frame is provided with a second driving device for driving the upper film roller to move toward the film feeding mechanism; the film feeding mechanism includes a supporting roller and a pressure roller, and the frame is provided with a third driving device for driving the supporting roller to rotate.

[0005] Furthermore, the film changing frame is provided with two centrally symmetrical workstations, and both ends of the film changing frame are provided with clamping grooves for cooperating with the film reel, and the clamping grooves are provided with a clamping shaft mechanism that can block the film reel.

[0006] Furthermore, the clamping shaft mechanism includes a bottom fixed wheel, a side fixed wheel and a moving wheel arranged around the film shaft, a pressure plate is hingedly provided on the film changing frame, the moving wheel is rotatably provided on the pressure plate, and a clamping wheel mechanism for driving the pressure plate to rotate is provided on the film changing frame.

[0007] Furthermore, the clamping wheel mechanism includes a rotating arm hingedly arranged on the frame and a fourth driving device for driving the rotating arm to rotate. A connecting rod is hingedly arranged on the rotating arm, and the other end of the connecting rod is hingedly arranged on the pressure plate.

[0008] Furthermore, the film fixing roller is a hollow structure, one end of the film fixing roller is connected to a vacuum pumping device, and a plurality of suction holes are provided on the film fixing roller.

[0009] Furthermore, a cutting groove is provided on the film fixing roller along the axial direction.

[0010] Furthermore, movable frames are provided on both ends of the frame to cooperate with the pressure roller, the pressure roller is rotatably provided on the movable frame, and a fifth driving device for driving the movable frame to move up and down is provided on the frame.

[0011] Furthermore, a trigger frame is hingedly provided on the frame, a trigger roller is provided on the trigger frame to press on the film, and a distance sensor is provided on the frame in conjunction with the trigger frame.

[0012] Furthermore, a film splicing and positioning mechanism is provided on the rear side of the film feeding mechanism, and the film splicing and positioning mechanism includes several guide rollers, a cross frame is provided between the guide rollers, a distance measuring device is provided on the cross frame, and a sixth driving device for driving the cross frame to move up and down is provided on the frame.

[0013] The above technical solution of the present invention has the following beneficial effects: the present invention can place multiple film rolls on the film changing rack. After the film feeding mechanism feeds out one of the film rolls, a new film roll can be loaded through the film preparation mechanism to realize automatic film supply, eliminate the trouble of stopping the machine for film changing operations, and improve the film feeding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A perspective view of an embodiment of the present invention;

[0015] Figure 2 A perspective view showing a first driving device according to an embodiment of the present invention;

[0016] Figure 3 A three-dimensional diagram of the interior of a frame according to an embodiment of the present invention;

[0017] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0018] Figure 5 A side view of the interior of a rack according to an embodiment of the present invention;

[0019] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0020] Figure 7 This is a three-dimensional diagram of the shaft clamping mechanism according to an embodiment of the present invention;

[0021] Figure 8 This is a three-dimensional exploded schematic diagram of the film fixing roller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, unless otherwise specified, “plurality” means two or more; the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head” and “tail” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] like Figure 1-8 As shown, the automatic film splicing mechanism of a packaging machine described in this embodiment includes a frame 1, on which are provided a film changing frame 2, a film preparation mechanism 3, and a film feeding mechanism 4; the film changing frame 2 is used to place the film rolls in operation and to be changed, the film preparation mechanism 3 is used to lead the front end of the film of the film roll to be changed to prepare for film application, and the film feeding mechanism 4 is used to feed the film;

[0025] The film changing frame 2 is provided with more than two workstations along the circumferential direction to match the film roll, and the frame 1 is provided with a first driving device 21 that drives the film changing frame 2 to rotate; in this embodiment, the film changing frame 2 is provided with two workstations, and the two workstations are centrally symmetrically arranged on the film changing frame 2, wherein the workstation close to the film outlet side is the film delivery station, and the other side is the film waiting delivery station, and the first driving device 21 is a motor, which cooperates with the reducer to drive the film changing frame 2 to rotate 180 degrees to switch the two workstations, thereby realizing the position switching of the new film roll and the old film roll;

[0026] The film preparation mechanism 3 includes a fixing film roller 31 and an upper film roller 32. The frame 1 is provided with a second driving device 33 that drives the upper film roller 32 to move toward the film feeding mechanism 4. In this embodiment, the fixing film roller 31 is rotatably arranged on the frame 1, and an upper film frame 34 is provided on the fixing film roller 31. The upper film roller 32 is rotatably arranged on the upper film frame 34. The second driving device 33 is a cylinder that drives the upper film frame 34 to swing. The fixing film roller 31 is used to fix the front end of the spare film roll. When the old film roll is about to be fed out, the second driving device 33 drives the upper film frame 34 to swing. The upper film roller 32 supports the front end of the new film fixed by the fixing film roller 31 and rotates upward, dragging the front end of the new film roll to the film feeding mechanism 4, and the front end of the new film roll is driven to continue to be fed out through the film feeding mechanism 4.

[0027] The film feeding mechanism 4 includes an idler roller 41 and a pressure roller 42. A third driving device 43 for driving the idler roller 41 to rotate is provided on the frame 1. The third driving device 43 is a motor. In this embodiment, the motor drives the idler roller 41 to rotate through a synchronous belt (not shown in the figure). The idler roller 41 cooperates with the pressure roller 42 to feed the film forward.

[0028] Preferably, the film changing frame 2 is provided with two centrally symmetrical workstations, and both ends of the film changing frame 2 are provided with a clamping groove 22 for cooperating with the film reel. The clamping groove 22 is provided with a clamping shaft mechanism that can block the film reel, and the reel of the film roll can be clamped in the clamping groove 22, and then the film reel is blocked by the clamping shaft mechanism to realize the disassembly and assembly of the film at the two workstations on the film changing frame 2. The front side of the film changing frame 2 is the working workstation, and the rear side of the film changing frame 2 is the film preparation workstation. After the film at the working workstation is delivered, the first driving device 21 drives the film changing frame 2 to rotate 180° to switch the two workstations, so that the film at the film preparation workstation is transferred to the working workstation for film supply, and the empty film roll at the working workstation is transferred to the film preparation workstation, and the worker removes the empty roll and replaces it with a new roll of film for film preparation;

[0029] Preferably, the clamping shaft mechanism includes a bottom fixed wheel 23, a side fixed wheel 24 and a moving wheel 25 arranged around the film shaft, a pressure plate 26 is hingedly provided on the film changing frame 2, and the moving wheel 25 is rotatably provided on the pressure plate 26. The film changing frame 2 is provided with a clamping wheel mechanism for driving the pressure plate 26 to rotate. The film reel is positioned by the bottom fixed wheel 23, the side fixed wheel 24 and the moving wheel 25. When the film reel is installed, the moving wheel 25 and the pressure plate 26 are in an open state. After the film reel is installed, the clamping wheel mechanism drives the pressure plate 26 to rotate, so that the moving wheel 25 is pressed on the film reel, completing the installation of the film reel;

[0030] Preferably, the clamping wheel mechanism includes a rotating arm 27 hingedly provided on the film changing frame 2 and a fourth driving device 28 for driving the rotating arm 27 to rotate, a connecting rod 29 is hingedly provided on the rotating arm 27, and the other end of the connecting rod 29 is hingedly provided on the pressure plate 26. In this embodiment, the rotating arm 27 can be hinged on the shaft of the side fixed wheel 24, and the fourth driving device 28 is a screw 281 and a screw sleeve 282 provided on the film changing frame 2, the screw sleeve 282 is hingedly provided on the rotating arm 27, and a screw seat 283 is rotatably provided on the film changing frame 2 to cooperate with the screw 281. The screw 281 rotates on the screw seat 283, driving the screw sleeve 282 to move along the screw 281, and the screw sleeve 282 drives the rotating arm 27 to swing, and the rotating arm 27 drives the pressure plate 26 to swing through the connecting rod 29, thereby realizing the switching of the moving wheel 25 between the open and closed states;

[0031] Preferably, the film fixing roller 31 is a hollow structure, one end of which is connected to a vacuum pumping device, and a plurality of suction holes 311 are provided on the film fixing roller 31. In this embodiment, the vacuum pumping device is a vacuum generator, and the front end of the spare film roll can be placed on the film fixing roller 31, and the film is sucked through the suction holes 311 on the film fixing roller 31.

[0032] Preferably, a cutting groove 312 is provided on the film fixing roller 31 along the axial direction. After the front end of the film is sucked by the suction hole 311, the worker can cut the front end of the film at the cutting groove 312 to make the front end of the film flush, wherein the cutting groove 312 is located on the upper side of the suction hole 311 to prevent the film from falling when cutting. After cutting, in order to ensure that the front end of the film does not separate from the film fixing roller 31 when the film is applied, the worker can stick the front end of the film to the film fixing roller 31 with tape. When applying the film, the tape stuck to the front end of the film can be pulled off by the film feeding mechanism 4. Preferably, the film fixing roller 31 and the film fixing roller 31 are connected. A torsion spring 313 is provided between the roller shafts, that is, when the fixing roller 31 rotates on the rotating frame via the roller shaft, the surface of the fixing roller 31 can also rotate relative to the roller shaft. When the second driving device 33 drives the upper film frame 34 to rotate and load the film, the fixing roller 31 rotates together with the upper film frame 34. When the front end lower part of the film is sent to the film feeding mechanism 4 for conveying, the film feeding mechanism 4 will pull the front end of the film. The front end of the film drives the surface of the fixing roller 31 to rotate around its roller shaft through the adhesive tape until the film feeding mechanism 4 peels off the adhesive tape at the front end of the film.

[0033] Preferably, a movable frame 46 is provided at both ends of the frame 1 to cooperate with the pressure roller 42, and the pressure roller 42 is rotatably provided on the movable frame 46, and a fifth driving device 44 is provided on the frame 1 to drive the movable frame 46 to move up and down. In this embodiment, the fifth driving device 44 is a cam rotatably provided on the frame 1, and a rocker 45 is provided on the frame 1 to drive the cam to rotate. A bracket 431 can be provided on the movable frame 46 to cooperate with the cam, and the rocker 45 is manually rotated to drive the cam to rotate, thereby controlling the movable frame 46 to move up and down; in the working state, the movable frame 46 is located at the lower side, and the pressure roller 42 is pressed on the supporting roller 41. When the machine is running for the first time, the worker needs to manually lay the film on the film feeding mechanism 4. At this time, the movable frame 46 needs to be raised to facilitate the film to pass between the pressure roller 42 and the supporting roller 41;

[0034] Preferably, a trigger frame 5 is hingedly provided on the frame 1, and a trigger roller 51 is provided on the trigger frame 5 to press on the film, and a distance sensor 52 is provided on the frame 1 to cooperate with the trigger frame 5; the trigger frame 5 is used to transmit a signal to the film preparation mechanism 3. In the working state, the film passes under the trigger roller 51, and the film lifts the trigger roller 51 upward, and the trigger frame 5 is out of the range of the distance sensor 52. When the film roll in operation is conveyed, the end of the film is separated from the film reel and is in a relaxed state. At this time, the film cannot continue to support the trigger roller 51 upward. At this time, the trigger frame 5 rotates downward, and the trigger frame 5 enters the monitoring range of the distance sensor 52. The distance sensor 52 then transmits a signal for film application, and the film preparation mechanism 3 is ready to apply the film;

[0035] Preferably, a film splicing and positioning mechanism 6 is provided at the rear side of the film feeding mechanism 4. The film splicing and positioning mechanism 6 includes a plurality of guide rollers 61. A cross frame 62 is provided between the guide rollers 61. A distance measuring device 63 is provided on the cross frame 62. In this embodiment, the distance measuring device 63 is an infrared counting sensor. A sixth driving device 64 for driving the cross frame 62 to move up and down is provided on the frame 1. A rack 65 can be vertically provided on the frame 1, and a gear 66 can be provided on the cross frame 62. The sixth driving device 64 is a servo motor for driving the gear 66 to rotate. The servo motor drives the gear 66 to rotate, which can make the cross frame 62 move up and down along the rack 65. After the film is sent out through the film feeding mechanism 4, The film positioning mechanism 6 is connected. When the trigger frame 5 swings downward to the distance sensor 52, the distance sensor 52 sends a signal, and the distance measuring device 63 starts to work to measure the distance the film has passed. After the film has reached the preset distance, the film preparation mechanism 3 starts to put on the film (several color marks are arranged at equal intervals on the film. Since the length of the film from the film roll to the roller 41 is fixed, the number of color marks from the film roll to the roller 41 can be counted in advance to determine the required number of counts. The distance measuring device 63 determines the distance the film has passed by counting the number of color marks, thereby estimating the distance from the film to the roller 41 after it leaves the reel. After reaching the required count, it outputs a signal and starts putting on the film).

[0036] The working process of this embodiment is:

[0037] Two film rolls are preset on the two stations of the film changing frame 2. The film roll on the inner station is first unrolled and laid by a worker, and then passes through the trigger frame 5, the roller 41 and the guide roller 61 in sequence. When the film passes through the roller 41, it is necessary to manually rotate the rocker 45 to rotate the cam, driving the movable frame 46 and the pressure roller 42 to move upward. After the film passes through, the rocker 45 is rotated in the opposite direction, and the movable frame 46 and the pressure roller 42 move downward, and the pressure roller 42 presses on the film.

[0038] After the film is laid, the third driving device 43 drives the roller 41 to rotate, driving the film to be sent out. Then the worker lays the front end of the film roll on the outer station of the film changing frame 2 to the film preparation mechanism 3. The front end of the film passes through the upper film roller 32 and the fixed film roller 31 in sequence. The front end of the film is sucked by the suction hole 311 on the fixed film roller 31. Then the worker cuts the front end of the film flat with a cutter and sticks the front end of the film to the fixed film roller 31 with tape.

[0039] After the film roll on the inner station is delivered, the end of the film roll is separated from the film reel, and the film is no longer in a taut state. At this time, the film loses the force to push the trigger frame 5 upward, and the trigger frame 5 swings downward to the distance sensor 52. The distance sensor 52 sends a signal, and a PLC controller (not shown in the figure) can be set on the frame 1 to centrally process the signal and connect various drive devices. The distance measuring device 63 on the horizontal frame 62 starts to count the color marks on the film. After counting the required number, the end of the film roll is about to reach the roller 41, and the distance measuring device 63 outputs a signal. The second drive device 33 drives the upper film frame 34 to swing, and the upper film roller 32 supports the film on the outer station to the roller 41. The roller 41 drives the upper film frame 34 to swing. The film roller 32 rotates in the opposite direction to pull down the film on the film fixing roller 31, and the film drives the film fixing roller 31 to rotate counterclockwise through the adhesive tape (a buffer mechanism can be set at the subsequent production line. When the film passes through the rotating roller, the rotating roller can be set to a movable pulley type, so that the roller 41 can rotate counterclockwise to make the film retreat without affecting the film supply of the subsequent production line), until the film and the adhesive tape are peeled off the film fixing roller 31, the film fixing roller 31 is reset by the torsion spring 313, and the roller 41 continues to rotate counterclockwise until the adhesive tape at the front end of the film sticks to the end of the previously sent out film, and the roller 41 rotates clockwise to send the film out together (subsequent die-cutting of the packaging bag can remove the packaging bag waste at the connection of the two rolls of film);

[0040] Then the second drive device 33 drives the upper film frame 34 to swing in the opposite direction, and the upper film roller 32 disengages from the roller 41 to reset. The first drive device 21 drives the film changing frame 2 to rotate 180° clockwise, and the two workstations are exchanged. The worker removes the empty reel and replaces it with a new roll of film, and then unfolds it to the film preparation mechanism 3 for laying, preparing for the film splicing operation of the next roll of film.

[0041] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. An automatic film splicing mechanism for packaging bags, characterized by: The machine comprises a frame on which a film changing frame, a film preparation mechanism and a film feeding mechanism are arranged; the film changing frame is provided with two or more workstations along the circumferential direction to match the film roll, and the frame is provided with a first driving device for driving the film changing frame to rotate; the film preparation mechanism comprises a film fixing roller and a film upper roller, and the frame is provided with a second driving device for driving the film upper roller to move toward the film feeding mechanism; the film feeding mechanism comprises an idler roller and a pressure roller, and the frame is provided with a third driving device for driving the idler roller to rotate; The film changing frame is provided with two centrally symmetrical workstations, and both ends of the film changing frame are provided with a clamping groove for cooperating with the film reel, and a clamping shaft mechanism is provided at the clamping groove to block the film reel; The clamping shaft mechanism includes a bottom fixed wheel, a side fixed wheel and a moving wheel arranged around the film shaft, a pressure plate is hingedly provided on the film changing frame, the moving wheel is rotatably provided on the pressure plate, and a clamping wheel mechanism for driving the pressure plate to rotate is provided on the film changing frame; The clamping wheel mechanism includes a rotating arm hingedly arranged on the frame and a fourth driving device that drives the rotating arm to rotate, the rotating arm is hingedly provided with a connecting rod, and the other end of the connecting rod is hingedly provided on the pressure plate; the fourth driving device is a screw and a screw sleeve provided on the film changing frame, the screw sleeve is hingedly provided on the rotating arm, and the film changing frame is provided with a screw seat that can rotatably cooperate with the screw; The film fixing roller is a hollow structure, one end of the film fixing roller is connected to a vacuum pumping device, and a plurality of suction holes are provided on the film fixing roller.

2. The automatic film splicing mechanism for packaging bags according to claim 1, characterized in that: The film fixing roller is provided with a cutting groove along the axial direction.

3. The automatic film splicing mechanism for packaging bags according to claim 1, characterized in that: The frame is provided with movable frames at both ends of the pressing roller, the pressing roller is rotatably provided on the movable frames, and the frame is provided with a fifth driving device for driving the movable frames to move up and down.

4. The automatic film splicing mechanism for packaging bags according to claim 1, characterized in that: A trigger frame is hingedly provided on the frame, a trigger roller pressed on the film is provided on the trigger frame, and a distance sensor is provided on the frame to match the trigger frame.

5. The automatic film splicing mechanism for packaging bags according to claim 4, characterized in that: A film splicing and positioning mechanism is provided on the rear side of the film feeding mechanism. The film splicing and positioning mechanism includes several guide rollers. A cross frame is provided between the guide rollers. A distance measuring device is provided on the cross frame. A sixth driving device for driving the cross frame to move up and down is provided on the frame.

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